adding nerdtree

1 files changed, 4059 insertions, 0 deletions

diff --git a/vim/plugin/NERD_tree.vim b/vim/plugin/NERD_tree.vim
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--- /dev/null
+++ b/vim/plugin/NERD_tree.vim
@@ -0,0 +1,4059 @@
+" ============================================================================
+" File:        NERD_tree.vim
+" Description: vim global plugin that provides a nice tree explorer
+" Maintainer:  Martin Grenfell <martin.grenfell at gmail dot com>
+" Last Change: 1 December, 2009
+" License:     This program is free software. It comes without any warranty,
+"              to the extent permitted by applicable law. You can redistribute
+"              it and/or modify it under the terms of the Do What The Fuck You
+"              Want To Public License, Version 2, as published by Sam Hocevar.
+"              See http://sam.zoy.org/wtfpl/COPYING for more details.
+"
+" ============================================================================
+let s:NERD_tree_version = '4.1.0'
+
+" SECTION: Script init stuff {{{1
+"============================================================
+if exists("loaded_nerd_tree")
+    finish
+endif
+if v:version < 700
+    echoerr "NERDTree: this plugin requires vim >= 7. DOWNLOAD IT! You'll thank me later!"
+    finish
+endif
+let loaded_nerd_tree = 1
+
+"for line continuation - i.e dont want C in &cpo
+let s:old_cpo = &cpo
+set cpo&vim
+
+"Function: s:initVariable() function {{{2
+"This function is used to initialise a given variable to a given value. The
+"variable is only initialised if it does not exist prior
+"
+"Args:
+"var: the name of the var to be initialised
+"value: the value to initialise var to
+"
+"Returns:
+"1 if the var is set, 0 otherwise
+function! s:initVariable(var, value)
+    if !exists(a:var)
+        exec 'let ' . a:var . ' = ' . "'" . a:value . "'"
+        return 1
+    endif
+    return 0
+endfunction
+
+"SECTION: Init variable calls and other random constants {{{2
+call s:initVariable("g:NERDChristmasTree", 1)
+call s:initVariable("g:NERDTreeAutoCenter", 1)
+call s:initVariable("g:NERDTreeAutoCenterThreshold", 3)
+call s:initVariable("g:NERDTreeCaseSensitiveSort", 0)
+call s:initVariable("g:NERDTreeChDirMode", 0)
+if !exists("g:NERDTreeIgnore")
+    let g:NERDTreeIgnore = ['\~$']
+endif
+call s:initVariable("g:NERDTreeBookmarksFile", expand('$HOME') . '/.NERDTreeBookmarks')
+call s:initVariable("g:NERDTreeHighlightCursorline", 1)
+call s:initVariable("g:NERDTreeHijackNetrw", 1)
+call s:initVariable("g:NERDTreeMouseMode", 1)
+call s:initVariable("g:NERDTreeNotificationThreshold", 100)
+call s:initVariable("g:NERDTreeQuitOnOpen", 0)
+call s:initVariable("g:NERDTreeShowBookmarks", 0)
+call s:initVariable("g:NERDTreeShowFiles", 1)
+call s:initVariable("g:NERDTreeShowHidden", 0)
+call s:initVariable("g:NERDTreeShowLineNumbers", 0)
+call s:initVariable("g:NERDTreeSortDirs", 1)
+
+if !exists("g:NERDTreeSortOrder")
+    let g:NERDTreeSortOrder = ['\/$', '*', '\.swp$',  '\.bak$', '\~$']
+else
+    "if there isnt a * in the sort sequence then add one
+    if count(g:NERDTreeSortOrder, '*') < 1
+        call add(g:NERDTreeSortOrder, '*')
+    endif
+endif
+
+"we need to use this number many times for sorting... so we calculate it only
+"once here
+let s:NERDTreeSortStarIndex = index(g:NERDTreeSortOrder, '*')
+
+if !exists('g:NERDTreeStatusline')
+
+    "the exists() crap here is a hack to stop vim spazzing out when
+    "loading a session that was created with an open nerd tree. It spazzes
+    "because it doesnt store b:NERDTreeRoot (its a b: var, and its a hash)
+    let g:NERDTreeStatusline = "%{exists('b:NERDTreeRoot')?b:NERDTreeRoot.path.str():''}"
+
+endif
+call s:initVariable("g:NERDTreeWinPos", "left")
+call s:initVariable("g:NERDTreeWinSize", 31)
+
+let s:running_windows = has("win16") || has("win32") || has("win64")
+
+"init the shell commands that will be used to copy nodes, and remove dir trees
+"
+"Note: the space after the command is important
+if s:running_windows
+    call s:initVariable("g:NERDTreeRemoveDirCmd", 'rmdir /s /q ')
+else
+    call s:initVariable("g:NERDTreeRemoveDirCmd", 'rm -rf ')
+    call s:initVariable("g:NERDTreeCopyCmd", 'cp -r ')
+endif
+
+
+"SECTION: Init variable calls for key mappings {{{2
+call s:initVariable("g:NERDTreeMapActivateNode", "o")
+call s:initVariable("g:NERDTreeMapChangeRoot", "C")
+call s:initVariable("g:NERDTreeMapChdir", "cd")
+call s:initVariable("g:NERDTreeMapCloseChildren", "X")
+call s:initVariable("g:NERDTreeMapCloseDir", "x")
+call s:initVariable("g:NERDTreeMapDeleteBookmark", "D")
+call s:initVariable("g:NERDTreeMapMenu", "m")
+call s:initVariable("g:NERDTreeMapHelp", "?")
+call s:initVariable("g:NERDTreeMapJumpFirstChild", "K")
+call s:initVariable("g:NERDTreeMapJumpLastChild", "J")
+call s:initVariable("g:NERDTreeMapJumpNextSibling", "<C-j>")
+call s:initVariable("g:NERDTreeMapJumpParent", "p")
+call s:initVariable("g:NERDTreeMapJumpPrevSibling", "<C-k>")
+call s:initVariable("g:NERDTreeMapJumpRoot", "P")
+call s:initVariable("g:NERDTreeMapOpenExpl", "e")
+call s:initVariable("g:NERDTreeMapOpenInTab", "t")
+call s:initVariable("g:NERDTreeMapOpenInTabSilent", "T")
+call s:initVariable("g:NERDTreeMapOpenRecursively", "O")
+call s:initVariable("g:NERDTreeMapOpenSplit", "i")
+call s:initVariable("g:NERDTreeMapOpenVSplit", "s")
+call s:initVariable("g:NERDTreeMapPreview", "g" . NERDTreeMapActivateNode)
+call s:initVariable("g:NERDTreeMapPreviewSplit", "g" . NERDTreeMapOpenSplit)
+call s:initVariable("g:NERDTreeMapPreviewVSplit", "g" . NERDTreeMapOpenVSplit)
+call s:initVariable("g:NERDTreeMapQuit", "q")
+call s:initVariable("g:NERDTreeMapRefresh", "r")
+call s:initVariable("g:NERDTreeMapRefreshRoot", "R")
+call s:initVariable("g:NERDTreeMapToggleBookmarks", "B")
+call s:initVariable("g:NERDTreeMapToggleFiles", "F")
+call s:initVariable("g:NERDTreeMapToggleFilters", "f")
+call s:initVariable("g:NERDTreeMapToggleHidden", "I")
+call s:initVariable("g:NERDTreeMapToggleZoom", "A")
+call s:initVariable("g:NERDTreeMapUpdir", "u")
+call s:initVariable("g:NERDTreeMapUpdirKeepOpen", "U")
+
+"SECTION: Script level variable declaration{{{2
+if s:running_windows
+    let s:escape_chars =  " `\|\"#%&,?()\*^<>"
+else
+    let s:escape_chars =  " \\`\|\"#%&,?()\*^<>"
+endif
+let s:NERDTreeBufName = 'NERD_tree_'
+
+let s:tree_wid = 2
+let s:tree_markup_reg = '^[ `|]*[\-+~]'
+let s:tree_up_dir_line = '.. (up a dir)'
+
+"the number to add to the nerd tree buffer name to make the buf name unique
+let s:next_buffer_number = 1
+
+" SECTION: Commands {{{1
+"============================================================
+"init the command that users start the nerd tree with
+command! -n=? -complete=dir -bar NERDTree :call s:initNerdTree('<args>')
+command! -n=? -complete=dir -bar NERDTreeToggle :call s:toggle('<args>')
+command! -n=0 -bar NERDTreeClose :call s:closeTreeIfOpen()
+command! -n=1 -complete=customlist,s:completeBookmarks -bar NERDTreeFromBookmark call s:initNerdTree('<args>')
+command! -n=0 -bar NERDTreeMirror call s:initNerdTreeMirror()
+command! -n=0 -bar NERDTreeFind call s:findAndRevealPath()
+" SECTION: Auto commands {{{1
+"============================================================
+augroup NERDTree
+    "Save the cursor position whenever we close the nerd tree
+    exec "autocmd BufWinLeave ". s:NERDTreeBufName ."* call <SID>saveScreenState()"
+    "cache bookmarks when vim loads
+    autocmd VimEnter * call s:Bookmark.CacheBookmarks(0)
+
+    "load all nerdtree plugins after vim starts
+    autocmd VimEnter * runtime! nerdtree_plugin/**/*.vim
+augroup END
+
+if g:NERDTreeHijackNetrw
+    augroup NERDTreeHijackNetrw
+        autocmd VimEnter * silent! autocmd! FileExplorer
+        au BufEnter,VimEnter * call s:checkForBrowse(expand("<amatch>"))
+    augroup END
+endif
+
+"SECTION: Classes {{{1
+"============================================================
+"CLASS: Bookmark {{{2
+"============================================================
+let s:Bookmark = {}
+" FUNCTION: Bookmark.activate() {{{3
+function! s:Bookmark.activate()
+    if self.path.isDirectory
+        call self.toRoot()
+    else
+        if self.validate()
+            let n = s:TreeFileNode.New(self.path)
+            call n.open()
+        endif
+    endif
+endfunction
+" FUNCTION: Bookmark.AddBookmark(name, path) {{{3
+" Class method to add a new bookmark to the list, if a previous bookmark exists
+" with the same name, just update the path for that bookmark
+function! s:Bookmark.AddBookmark(name, path)
+    for i in s:Bookmark.Bookmarks()
+        if i.name ==# a:name
+            let i.path = a:path
+            return
+        endif
+    endfor
+    call add(s:Bookmark.Bookmarks(), s:Bookmark.New(a:name, a:path))
+    call s:Bookmark.Sort()
+endfunction
+" Function: Bookmark.Bookmarks()   {{{3
+" Class method to get all bookmarks. Lazily initializes the bookmarks global
+" variable
+function! s:Bookmark.Bookmarks()
+    if !exists("g:NERDTreeBookmarks")
+        let g:NERDTreeBookmarks = []
+    endif
+    return g:NERDTreeBookmarks
+endfunction
+" Function: Bookmark.BookmarkExistsFor(name)   {{{3
+" class method that returns 1 if a bookmark with the given name is found, 0
+" otherwise
+function! s:Bookmark.BookmarkExistsFor(name)
+    try
+        call s:Bookmark.BookmarkFor(a:name)
+        return 1
+    catch /^NERDTree.BookmarkNotFoundError/
+        return 0
+    endtry
+endfunction
+" Function: Bookmark.BookmarkFor(name)   {{{3
+" Class method to get the bookmark that has the given name. {} is return if no
+" bookmark is found
+function! s:Bookmark.BookmarkFor(name)
+    for i in s:Bookmark.Bookmarks()
+        if i.name ==# a:name
+            return i
+        endif
+    endfor
+    throw "NERDTree.BookmarkNotFoundError: no bookmark found for name: \"". a:name  .'"'
+endfunction
+" Function: Bookmark.BookmarkNames()   {{{3
+" Class method to return an array of all bookmark names
+function! s:Bookmark.BookmarkNames()
+    let names = []
+    for i in s:Bookmark.Bookmarks()
+        call add(names, i.name)
+    endfor
+    return names
+endfunction
+" FUNCTION: Bookmark.CacheBookmarks(silent) {{{3
+" Class method to read all bookmarks from the bookmarks file intialize
+" bookmark objects for each one.
+"
+" Args:
+" silent - dont echo an error msg if invalid bookmarks are found
+function! s:Bookmark.CacheBookmarks(silent)
+    if filereadable(g:NERDTreeBookmarksFile)
+        let g:NERDTreeBookmarks = []
+        let g:NERDTreeInvalidBookmarks = []
+        let bookmarkStrings = readfile(g:NERDTreeBookmarksFile)
+        let invalidBookmarksFound = 0
+        for i in bookmarkStrings
+
+            "ignore blank lines
+            if i != ''
+
+                let name = substitute(i, '^\(.\{-}\) .*$', '\1', '')
+                let path = substitute(i, '^.\{-} \(.*\)$', '\1', '')
+
+                try
+                    let bookmark = s:Bookmark.New(name, s:Path.New(path))
+                    call add(g:NERDTreeBookmarks, bookmark)
+                catch /^NERDTree.InvalidArgumentsError/
+                    call add(g:NERDTreeInvalidBookmarks, i)
+                    let invalidBookmarksFound += 1
+                endtry
+            endif
+        endfor
+        if invalidBookmarksFound
+            call s:Bookmark.Write()
+            if !a:silent
+                call s:echo(invalidBookmarksFound . " invalid bookmarks were read. See :help NERDTreeInvalidBookmarks for info.")
+            endif
+        endif
+        call s:Bookmark.Sort()
+    endif
+endfunction
+" FUNCTION: Bookmark.compareTo(otherbookmark) {{{3
+" Compare these two bookmarks for sorting purposes
+function! s:Bookmark.compareTo(otherbookmark)
+    return a:otherbookmark.name < self.name
+endfunction
+" FUNCTION: Bookmark.ClearAll() {{{3
+" Class method to delete all bookmarks.
+function! s:Bookmark.ClearAll()
+    for i in s:Bookmark.Bookmarks()
+        call i.delete()
+    endfor
+    call s:Bookmark.Write()
+endfunction
+" FUNCTION: Bookmark.delete() {{{3
+" Delete this bookmark. If the node for this bookmark is under the current
+" root, then recache bookmarks for its Path object
+function! s:Bookmark.delete()
+    let node = {}
+    try
+        let node = self.getNode(1)
+    catch /^NERDTree.BookmarkedNodeNotFoundError/
+    endtry
+    call remove(s:Bookmark.Bookmarks(), index(s:Bookmark.Bookmarks(), self))
+    if !empty(node)
+        call node.path.cacheDisplayString()
+    endif
+    call s:Bookmark.Write()
+endfunction
+" FUNCTION: Bookmark.getNode(searchFromAbsoluteRoot) {{{3
+" Gets the treenode for this bookmark
+"
+" Args:
+" searchFromAbsoluteRoot: specifies whether we should search from the current
+" tree root, or the highest cached node
+function! s:Bookmark.getNode(searchFromAbsoluteRoot)
+    let searchRoot = a:searchFromAbsoluteRoot ? s:TreeDirNode.AbsoluteTreeRoot() : b:NERDTreeRoot
+    let targetNode = searchRoot.findNode(self.path)
+    if empty(targetNode)
+        throw "NERDTree.BookmarkedNodeNotFoundError: no node was found for bookmark: " . self.name
+    endif
+    return targetNode
+endfunction
+" FUNCTION: Bookmark.GetNodeForName(name, searchFromAbsoluteRoot) {{{3
+" Class method that finds the bookmark with the given name and returns the
+" treenode for it.
+function! s:Bookmark.GetNodeForName(name, searchFromAbsoluteRoot)
+    let bookmark = s:Bookmark.BookmarkFor(a:name)
+    return bookmark.getNode(a:searchFromAbsoluteRoot)
+endfunction
+" FUNCTION: Bookmark.GetSelected() {{{3
+" returns the Bookmark the cursor is over, or {}
+function! s:Bookmark.GetSelected()
+    let line = getline(".")
+    let name = substitute(line, '^>\(.\{-}\) .\+$', '\1', '')
+    if name != line
+        try
+            return s:Bookmark.BookmarkFor(name)
+        catch /^NERDTree.BookmarkNotFoundError/
+            return {}
+        endtry
+    endif
+    return {}
+endfunction
+
+" Function: Bookmark.InvalidBookmarks()   {{{3
+" Class method to get all invalid bookmark strings read from the bookmarks
+" file
+function! s:Bookmark.InvalidBookmarks()
+    if !exists("g:NERDTreeInvalidBookmarks")
+        let g:NERDTreeInvalidBookmarks = []
+    endif
+    return g:NERDTreeInvalidBookmarks
+endfunction
+" FUNCTION: Bookmark.mustExist() {{{3
+function! s:Bookmark.mustExist()
+    if !self.path.exists()
+        call s:Bookmark.CacheBookmarks(1)
+        throw "NERDTree.BookmarkPointsToInvalidLocationError: the bookmark \"".
+            \ self.name ."\" points to a non existing location: \"". self.path.str()
+    endif
+endfunction
+" FUNCTION: Bookmark.New(name, path) {{{3
+" Create a new bookmark object with the given name and path object
+function! s:Bookmark.New(name, path)
+    if a:name =~ ' '
+        throw "NERDTree.IllegalBookmarkNameError: illegal name:" . a:name
+    endif
+
+    let newBookmark = copy(self)
+    let newBookmark.name = a:name
+    let newBookmark.path = a:path
+    return newBookmark
+endfunction
+" FUNCTION: Bookmark.openInNewTab(options) {{{3
+" Create a new bookmark object with the given name and path object
+function! s:Bookmark.openInNewTab(options)
+    let currentTab = tabpagenr()
+    if self.path.isDirectory
+        tabnew
+        call s:initNerdTree(self.name)
+    else
+        exec "tabedit " . bookmark.path.str({'format': 'Edit'})
+    endif
+
+    if has_key(a:options, 'stayInCurrentTab')
+        exec "tabnext " . currentTab
+    endif
+endfunction
+" Function: Bookmark.setPath(path)   {{{3
+" makes this bookmark point to the given path
+function! s:Bookmark.setPath(path)
+    let self.path = a:path
+endfunction
+" Function: Bookmark.Sort()   {{{3
+" Class method that sorts all bookmarks
+function! s:Bookmark.Sort()
+    let CompareFunc = function("s:compareBookmarks")
+    call sort(s:Bookmark.Bookmarks(), CompareFunc)
+endfunction
+" Function: Bookmark.str()   {{{3
+" Get the string that should be rendered in the view for this bookmark
+function! s:Bookmark.str()
+    let pathStrMaxLen = winwidth(s:getTreeWinNum()) - 4 - len(self.name)
+    if &nu
+        let pathStrMaxLen = pathStrMaxLen - &numberwidth
+    endif
+
+    let pathStr = self.path.str({'format': 'UI'})
+    if len(pathStr) > pathStrMaxLen
+        let pathStr = '<' . strpart(pathStr, len(pathStr) - pathStrMaxLen)
+    endif
+    return '>' . self.name . ' ' . pathStr
+endfunction
+" FUNCTION: Bookmark.toRoot() {{{3
+" Make the node for this bookmark the new tree root
+function! s:Bookmark.toRoot()
+    if self.validate()
+        try
+            let targetNode = self.getNode(1)
+        catch /^NERDTree.BookmarkedNodeNotFoundError/
+            let targetNode = s:TreeFileNode.New(s:Bookmark.BookmarkFor(self.name).path)
+        endtry
+        call targetNode.makeRoot()
+        call s:renderView()
+        call targetNode.putCursorHere(0, 0)
+    endif
+endfunction
+" FUNCTION: Bookmark.ToRoot(name) {{{3
+" Make the node for this bookmark the new tree root
+function! s:Bookmark.ToRoot(name)
+    let bookmark = s:Bookmark.BookmarkFor(a:name)
+    call bookmark.toRoot()
+endfunction
+
+
+"FUNCTION: Bookmark.validate() {{{3
+function! s:Bookmark.validate()
+    if self.path.exists()
+        return 1
+    else
+        call s:Bookmark.CacheBookmarks(1)
+        call s:renderView()
+        call s:echo(self.name . "now points to an invalid location. See :help NERDTreeInvalidBookmarks for info.")
+        return 0
+    endif
+endfunction
+
+" Function: Bookmark.Write()   {{{3
+" Class method to write all bookmarks to the bookmarks file
+function! s:Bookmark.Write()
+    let bookmarkStrings = []
+    for i in s:Bookmark.Bookmarks()
+        call add(bookmarkStrings, i.name . ' ' . i.path.str())
+    endfor
+
+    "add a blank line before the invalid ones
+    call add(bookmarkStrings, "")
+
+    for j in s:Bookmark.InvalidBookmarks()
+        call add(bookmarkStrings, j)
+    endfor
+    call writefile(bookmarkStrings, g:NERDTreeBookmarksFile)
+endfunction
+"CLASS: KeyMap {{{2
+"============================================================
+let s:KeyMap = {}
+"FUNCTION: KeyMap.All() {{{3
+function! s:KeyMap.All()
+    if !exists("s:keyMaps")
+        let s:keyMaps = []
+    endif
+    return s:keyMaps
+endfunction
+
+"FUNCTION: KeyMap.BindAll() {{{3
+function! s:KeyMap.BindAll()
+    for i in s:KeyMap.All()
+        call i.bind()
+    endfor
+endfunction
+
+"FUNCTION: KeyMap.bind() {{{3
+function! s:KeyMap.bind()
+    exec "nnoremap <silent> <buffer> ". self.key ." :call ". self.callback ."()<cr>"
+endfunction
+
+"FUNCTION: KeyMap.Create(options) {{{3
+function! s:KeyMap.Create(options)
+    let newKeyMap = copy(self)
+    let newKeyMap.key = a:options['key']
+    let newKeyMap.quickhelpText = a:options['quickhelpText']
+    let newKeyMap.callback = a:options['callback']
+    call add(s:KeyMap.All(), newKeyMap)
+endfunction
+"CLASS: MenuController {{{2
+"============================================================
+let s:MenuController = {}
+"FUNCTION: MenuController.New(menuItems) {{{3
+"create a new menu controller that operates on the given menu items
+function! s:MenuController.New(menuItems)
+    let newMenuController =  copy(self)
+    if a:menuItems[0].isSeparator()
+        let newMenuController.menuItems = a:menuItems[1:-1]
+    else
+        let newMenuController.menuItems = a:menuItems
+    endif
+    return newMenuController
+endfunction
+
+"FUNCTION: MenuController.showMenu() {{{3
+"start the main loop of the menu and get the user to choose/execute a menu
+"item
+function! s:MenuController.showMenu()
+    call self._saveOptions()
+
+    try
+        let self.selection = 0
+
+        let done = 0
+        while !done
+            redraw!
+            call self._echoPrompt()
+            let key = nr2char(getchar())
+            let done = self._handleKeypress(key)
+        endwhile
+    finally
+        call self._restoreOptions()
+    endtry
+
+    if self.selection != -1
+        let m = self._current()
+        call m.execute()
+    endif
+endfunction
+
+"FUNCTION: MenuController._echoPrompt() {{{3
+function! s:MenuController._echoPrompt()
+    echo "NERDTree Menu. Use j/k/enter and the shortcuts indicated"
+    echo "=========================================================="
+
+    for i in range(0, len(self.menuItems)-1)
+        if self.selection == i
+            echo "> " . self.menuItems[i].text
+        else
+            echo "  " . self.menuItems[i].text
+        endif
+    endfor
+endfunction
+
+"FUNCTION: MenuController._current(key) {{{3
+"get the MenuItem that is curently selected
+function! s:MenuController._current()
+    return self.menuItems[self.selection]
+endfunction
+
+"FUNCTION: MenuController._handleKeypress(key) {{{3
+"change the selection (if appropriate) and return 1 if the user has made
+"their choice, 0 otherwise
+function! s:MenuController._handleKeypress(key)
+    if a:key == 'j'
+        call self._cursorDown()
+    elseif a:key == 'k'
+        call self._cursorUp()
+    elseif a:key == nr2char(27) "escape
+        let self.selection = -1
+        return 1
+    elseif a:key == "\r" || a:key == "\n" "enter and ctrl-j
+        return 1
+    else
+        let index = self._nextIndexFor(a:key)
+        if index != -1
+            let self.selection = index
+            if len(self._allIndexesFor(a:key)) == 1
+                return 1
+            endif
+        endif
+    endif
+
+    return 0
+endfunction
+
+"FUNCTION: MenuController._allIndexesFor(shortcut) {{{3
+"get indexes to all menu items with the given shortcut
+function! s:MenuController._allIndexesFor(shortcut)
+    let toReturn = []
+
+    for i in range(0, len(self.menuItems)-1)
+        if self.menuItems[i].shortcut == a:shortcut
+            call add(toReturn, i)
+        endif
+    endfor
+
+    return toReturn
+endfunction
+
+"FUNCTION: MenuController._nextIndexFor(shortcut) {{{3
+"get the index to the next menu item with the given shortcut, starts from the
+"current cursor location and wraps around to the top again if need be
+function! s:MenuController._nextIndexFor(shortcut)
+    for i in range(self.selection+1, len(self.menuItems)-1)
+        if self.menuItems[i].shortcut == a:shortcut
+            return i
+        endif
+    endfor
+
+    for i in range(0, self.selection)
+        if self.menuItems[i].shortcut == a:shortcut
+            return i
+        endif
+    endfor
+
+    return -1
+endfunction
+
+"FUNCTION: MenuController._setCmdheight() {{{3
+"sets &cmdheight to whatever is needed to display the menu
+function! s:MenuController._setCmdheight()
+    let &cmdheight = len(self.menuItems) + 3
+endfunction
+
+"FUNCTION: MenuController._saveOptions() {{{3
+"set any vim options that are required to make the menu work (saving their old
+"values)
+function! s:MenuController._saveOptions()
+    let self._oldLazyredraw = &lazyredraw
+    let self._oldCmdheight = &cmdheight
+    set nolazyredraw
+    call self._setCmdheight()
+endfunction
+
+"FUNCTION: MenuController._restoreOptions() {{{3
+"restore the options we saved in _saveOptions()
+function! s:MenuController._restoreOptions()
+    let &cmdheight = self._oldCmdheight
+    let &lazyredraw = self._oldLazyredraw
+endfunction
+
+"FUNCTION: MenuController._cursorDown() {{{3
+"move the cursor to the next menu item, skipping separators
+function! s:MenuController._cursorDown()
+    let done = 0
+    while !done
+        if self.selection < len(self.menuItems)-1
+            let self.selection += 1
+        else
+            let self.selection = 0
+        endif
+
+        if !self._current().isSeparator()
+            let done = 1
+        endif
+    endwhile
+endfunction
+
+"FUNCTION: MenuController._cursorUp() {{{3
+"move the cursor to the previous menu item, skipping separators
+function! s:MenuController._cursorUp()
+    let done = 0
+    while !done
+        if self.selection > 0
+            let self.selection -= 1
+        else
+            let self.selection = len(self.menuItems)-1
+        endif
+
+        if !self._current().isSeparator()
+            let done = 1
+        endif
+    endwhile
+endfunction
+
+"CLASS: MenuItem {{{2
+"============================================================
+let s:MenuItem = {}
+"FUNCTION: MenuItem.All() {{{3
+"get all top level menu items
+function! s:MenuItem.All()
+    if !exists("s:menuItems")
+        let s:menuItems = []
+    endif
+    return s:menuItems
+endfunction
+
+"FUNCTION: MenuItem.AllEnabled() {{{3
+"get all top level menu items that are currently enabled
+function! s:MenuItem.AllEnabled()
+    let toReturn = []
+    for i in s:MenuItem.All()
+        if i.enabled()
+            call add(toReturn, i)
+        endif
+    endfor
+    return toReturn
+endfunction
+
+"FUNCTION: MenuItem.Create(options) {{{3
+"make a new menu item and add it to the global list
+function! s:MenuItem.Create(options)
+    let newMenuItem = copy(self)
+
+    let newMenuItem.text = a:options['text']
+    let newMenuItem.shortcut = a:options['shortcut']
+    let newMenuItem.children = []
+
+    let newMenuItem.isActiveCallback = -1
+    if has_key(a:options, 'isActiveCallback')
+        let newMenuItem.isActiveCallback = a:options['isActiveCallback']
+    endif
+
+    let newMenuItem.callback = -1
+    if has_key(a:options, 'callback')
+        let newMenuItem.callback = a:options['callback']
+    endif
+
+    if has_key(a:options, 'parent')
+        call add(a:options['parent'].children, newMenuItem)
+    else
+        call add(s:MenuItem.All(), newMenuItem)
+    endif
+
+    return newMenuItem
+endfunction
+
+"FUNCTION: MenuItem.CreateSeparator(options) {{{3
+"make a new separator menu item and add it to the global list
+function! s:MenuItem.CreateSeparator(options)
+    let standard_options = { 'text': '--------------------',
+                \ 'shortcut': -1,
+                \ 'callback': -1 }
+    let options = extend(a:options, standard_options, "force")
+
+    return s:MenuItem.Create(options)
+endfunction
+
+"FUNCTION: MenuItem.CreateSubmenu(options) {{{3
+"make a new submenu and add it to global list
+function! s:MenuItem.CreateSubmenu(options)
+    let standard_options = { 'callback': -1 }
+    let options = extend(a:options, standard_options, "force")
+
+    return s:MenuItem.Create(options)
+endfunction
+
+"FUNCTION: MenuItem.enabled() {{{3
+"return 1 if this menu item should be displayed
+"
+"delegates off to the isActiveCallback, and defaults to 1 if no callback was
+"specified
+function! s:MenuItem.enabled()
+    if self.isActiveCallback != -1
+        return {self.isActiveCallback}()
+    endif
+    return 1
+endfunction
+
+"FUNCTION: MenuItem.execute() {{{3
+"perform the action behind this menu item, if this menuitem has children then
+"display a new menu for them, otherwise deletegate off to the menuitem's
+"callback
+function! s:MenuItem.execute()
+    if len(self.children)
+        let mc = s:MenuController.New(self.children)
+        call mc.showMenu()
+    else
+        if self.callback != -1
+            call {self.callback}()
+        endif
+    endif
+endfunction
+
+"FUNCTION: MenuItem.isSeparator() {{{3
+"return 1 if this menuitem is a separator
+function! s:MenuItem.isSeparator()
+    return self.callback == -1 && self.children == []
+endfunction
+
+"FUNCTION: MenuItem.isSubmenu() {{{3
+"return 1 if this menuitem is a submenu
+function! s:MenuItem.isSubmenu()
+    return self.callback == -1 && !empty(self.children)
+endfunction
+
+"CLASS: TreeFileNode {{{2
+"This class is the parent of the TreeDirNode class and constitures the
+"'Component' part of the composite design pattern between the treenode
+"classes.
+"============================================================
+let s:TreeFileNode = {}
+"FUNCTION: TreeFileNode.activate(forceKeepWinOpen) {{{3
+function! s:TreeFileNode.activate(forceKeepWinOpen)
+    call self.open()
+    if !a:forceKeepWinOpen
+        call s:closeTreeIfQuitOnOpen()
+    end
+endfunction
+"FUNCTION: TreeFileNode.bookmark(name) {{{3
+"bookmark this node with a:name
+function! s:TreeFileNode.bookmark(name)
+    try
+        let oldMarkedNode = s:Bookmark.GetNodeForName(a:name, 1)
+        call oldMarkedNode.path.cacheDisplayString()
+    catch /^NERDTree.BookmarkNotFoundError/
+    endtry
+
+    call s:Bookmark.AddBookmark(a:name, self.path)
+    call self.path.cacheDisplayString()
+    call s:Bookmark.Write()
+endfunction
+"FUNCTION: TreeFileNode.cacheParent() {{{3
+"initializes self.parent if it isnt already
+function! s:TreeFileNode.cacheParent()
+    if empty(self.parent)
+        let parentPath = self.path.getParent()
+        if parentPath.equals(self.path)
+            throw "NERDTree.CannotCacheParentError: already at root"
+        endif
+        let self.parent = s:TreeFileNode.New(parentPath)
+    endif
+endfunction
+"FUNCTION: TreeFileNode.compareNodes {{{3
+"This is supposed to be a class level method but i cant figure out how to
+"get func refs to work from a dict..
+"
+"A class level method that compares two nodes
+"
+"Args:
+"n1, n2: the 2 nodes to compare
+function! s:compareNodes(n1, n2)
+    return a:n1.path.compareTo(a:n2.path)
+endfunction
+
+"FUNCTION: TreeFileNode.clearBoomarks() {{{3
+function! s:TreeFileNode.clearBoomarks()
+    for i in s:Bookmark.Bookmarks()
+        if i.path.equals(self.path)
+            call i.delete()
+        end
+    endfor
+    call self.path.cacheDisplayString()
+endfunction
+"FUNCTION: TreeFileNode.copy(dest) {{{3
+function! s:TreeFileNode.copy(dest)
+    call self.path.copy(a:dest)
+    let newPath = s:Path.New(a:dest)
+    let parent = b:NERDTreeRoot.findNode(newPath.getParent())
+    if !empty(parent)
+        call parent.refresh()
+    endif
+    return parent.findNode(newPath)
+endfunction
+
+"FUNCTION: TreeFileNode.delete {{{3
+"Removes this node from the tree and calls the Delete method for its path obj
+function! s:TreeFileNode.delete()
+    call self.path.delete()
+    call self.parent.removeChild(self)
+endfunction
+
+"FUNCTION: TreeFileNode.displayString() {{{3
+"
+"Returns a string that specifies how the node should be represented as a
+"string
+"
+"Return:
+"a string that can be used in the view to represent this node
+function! s:TreeFileNode.displayString()
+    return self.path.displayString()
+endfunction
+
+"FUNCTION: TreeFileNode.equals(treenode) {{{3
+"
+"Compares this treenode to the input treenode and returns 1 if they are the
+"same node.
+"
+"Use this method instead of ==  because sometimes when the treenodes contain
+"many children, vim seg faults when doing ==
+"
+"Args:
+"treenode: the other treenode to compare to
+function! s:TreeFileNode.equals(treenode)
+    return self.path.str() ==# a:treenode.path.str()
+endfunction
+
+"FUNCTION: TreeFileNode.findNode(path) {{{3
+"Returns self if this node.path.Equals the given path.
+"Returns {} if not equal.
+"
+"Args:
+"path: the path object to compare against
+function! s:TreeFileNode.findNode(path)
+    if a:path.equals(self.path)
+        return self
+    endif
+    return {}
+endfunction
+"FUNCTION: TreeFileNode.findOpenDirSiblingWithVisibleChildren(direction) {{{3
+"
+"Finds the next sibling for this node in the indicated direction. This sibling
+"must be a directory and may/may not have children as specified.
+"
+"Args:
+"direction: 0 if you want to find the previous sibling, 1 for the next sibling
+"
+"Return:
+"a treenode object or {} if no appropriate sibling could be found
+function! s:TreeFileNode.findOpenDirSiblingWithVisibleChildren(direction)
+    "if we have no parent then we can have no siblings
+    if self.parent != {}
+        let nextSibling = self.findSibling(a:direction)
+
+        while nextSibling != {}
+            if nextSibling.path.isDirectory && nextSibling.hasVisibleChildren() && nextSibling.isOpen
+                return nextSibling
+            endif
+            let nextSibling = nextSibling.findSibling(a:direction)
+        endwhile
+    endif
+
+    return {}
+endfunction
+"FUNCTION: TreeFileNode.findSibling(direction) {{{3
+"
+"Finds the next sibling for this node in the indicated direction
+"
+"Args:
+"direction: 0 if you want to find the previous sibling, 1 for the next sibling
+"
+"Return:
+"a treenode object or {} if no sibling could be found
+function! s:TreeFileNode.findSibling(direction)
+    "if we have no parent then we can have no siblings
+    if self.parent != {}
+
+        "get the index of this node in its parents children
+        let siblingIndx = self.parent.getChildIndex(self.path)
+
+        if siblingIndx != -1
+            "move a long to the next potential sibling node
+            let siblingIndx = a:direction ==# 1 ? siblingIndx+1 : siblingIndx-1
+
+            "keep moving along to the next sibling till we find one that is valid
+            let numSiblings = self.parent.getChildCount()
+            while siblingIndx >= 0 && siblingIndx < numSiblings
+
+                "if the next node is not an ignored node (i.e. wont show up in the
+                "view) then return it
+                if self.parent.children[siblingIndx].path.ignore() ==# 0
+                    return self.parent.children[siblingIndx]
+                endif
+
+                "go to next node
+                let siblingIndx = a:direction ==# 1 ? siblingIndx+1 : siblingIndx-1
+            endwhile
+        endif
+    endif
+
+    return {}
+endfunction
+
+"FUNCTION: TreeFileNode.getLineNum(){{{3
+"returns the line number this node is rendered on, or -1 if it isnt rendered
+function! s:TreeFileNode.getLineNum()
+    "if the node is the root then return the root line no.
+    if self.isRoot()
+        return s:TreeFileNode.GetRootLineNum()
+    endif
+
+    let totalLines = line("$")
+
+    "the path components we have matched so far
+    let pathcomponents = [substitute(b:NERDTreeRoot.path.str({'format': 'UI'}), '/ *$', '', '')]
+    "the index of the component we are searching for
+    let curPathComponent = 1
+
+    let fullpath = self.path.str({'format': 'UI'})
+
+
+    let lnum = s:TreeFileNode.GetRootLineNum()
+    while lnum > 0
+        let lnum = lnum + 1
+        "have we reached the bottom of the tree?
+        if lnum ==# totalLines+1
+            return -1
+        endif
+
+        let curLine = getline(lnum)
+
+        let indent = s:indentLevelFor(curLine)
+        if indent ==# curPathComponent
+            let curLine = s:stripMarkupFromLine(curLine, 1)
+
+            let curPath =  join(pathcomponents, '/') . '/' . curLine
+            if stridx(fullpath, curPath, 0) ==# 0
+                if fullpath ==# curPath || strpart(fullpath, len(curPath)-1,1) ==# '/'
+                    let curLine = substitute(curLine, '/ *$', '', '')
+                    call add(pathcomponents, curLine)
+                    let curPathComponent = curPathComponent + 1
+
+                    if fullpath ==# curPath
+                        return lnum
+                    endif
+                endif
+            endif
+        endif
+    endwhile
+    return -1
+endfunction
+
+"FUNCTION: TreeFileNode.GetRootForTab(){{{3
+"get the root node for this tab
+function! s:TreeFileNode.GetRootForTab()
+    if s:treeExistsForTab()
+        return getbufvar(t:NERDTreeBufName, 'NERDTreeRoot')
+    end
+    return {}
+endfunction
+"FUNCTION: TreeFileNode.GetRootLineNum(){{{3
+"gets the line number of the root node
+function! s:TreeFileNode.GetRootLineNum()
+    let rootLine = 1
+    while getline(rootLine) !~ '^\(/\|<\)'
+        let rootLine = rootLine + 1
+    endwhile
+    return rootLine
+endfunction
+
+"FUNCTION: TreeFileNode.GetSelected() {{{3
+"gets the treenode that the cursor is currently over
+function! s:TreeFileNode.GetSelected()
+    try
+        let path = s:getPath(line("."))
+        if path ==# {}
+            return {}
+        endif
+        return b:NERDTreeRoot.findNode(path)
+    catch /NERDTree/
+        return {}
+    endtry
+endfunction
+"FUNCTION: TreeFileNode.isVisible() {{{3
+"returns 1 if this node should be visible according to the tree filters and
+"hidden file filters (and their on/off status)
+function! s:TreeFileNode.isVisible()
+    return !self.path.ignore()
+endfunction
+"FUNCTION: TreeFileNode.isRoot() {{{3
+"returns 1 if this node is b:NERDTreeRoot
+function! s:TreeFileNode.isRoot()
+    if !s:treeExistsForBuf()
+        throw "NERDTree.NoTreeError: No tree exists for the current buffer"
+    endif
+
+    return self.equals(b:NERDTreeRoot)
+endfunction
+
+"FUNCTION: TreeFileNode.makeRoot() {{{3
+"Make this node the root of the tree
+function! s:TreeFileNode.makeRoot()
+    if self.path.isDirectory
+        let b:NERDTreeRoot = self
+    else
+        call self.cacheParent()
+        let b:NERDTreeRoot = self.parent
+    endif
+
+    call b:NERDTreeRoot.open()
+
+    "change dir to the dir of the new root if instructed to
+    if g:NERDTreeChDirMode ==# 2
+        exec "cd " . b:NERDTreeRoot.path.str({'format': 'Edit'})
+    endif
+endfunction
+"FUNCTION: TreeFileNode.New(path) {{{3
+"Returns a new TreeNode object with the given path and parent
+"
+"Args:
+"path: a path object representing the full filesystem path to the file/dir that the node represents
+function! s:TreeFileNode.New(path)
+    if a:path.isDirectory
+        return s:TreeDirNode.New(a:path)
+    else
+        let newTreeNode = copy(self)
+        let newTreeNode.path = a:path
+        let newTreeNode.parent = {}
+        return newTreeNode
+    endif
+endfunction
+
+"FUNCTION: TreeFileNode.open() {{{3
+"Open the file represented by the given node in the current window, splitting
+"the window if needed
+"
+"ARGS:
+"treenode: file node to open
+function! s:TreeFileNode.open()
+    if b:NERDTreeType ==# "secondary"
+        exec 'edit ' . self.path.str({'format': 'Edit'})
+        return
+    endif
+
+    "if the file is already open in this tab then just stick the cursor in it
+    let winnr = bufwinnr('^' . self.path.str() . '$')
+    if winnr != -1
+        call s:exec(winnr . "wincmd w")
+
+    else
+        if !s:isWindowUsable(winnr("#")) && s:firstUsableWindow() ==# -1
+            call self.openSplit()
+        else
+            try
+                if !s:isWindowUsable(winnr("#"))
+                    call s:exec(s:firstUsableWindow() . "wincmd w")
+                else
+                    call s:exec('wincmd p')
+                endif
+                exec ("edit " . self.path.str({'format': 'Edit'}))
+            catch /^Vim\%((\a\+)\)\=:E37/
+                call s:putCursorInTreeWin()
+                throw "NERDTree.FileAlreadyOpenAndModifiedError: ". self.path.str() ." is already open and modified."
+            catch /^Vim\%((\a\+)\)\=:/
+                echo v:exception
+            endtry
+        endif
+    endif
+endfunction
+"FUNCTION: TreeFileNode.openSplit() {{{3
+"Open this node in a new window
+function! s:TreeFileNode.openSplit()
+
+    if b:NERDTreeType ==# "secondary"
+        exec "split " . self.path.str({'format': 'Edit'})
+        return
+    endif
+
+    " Save the user's settings for splitbelow and splitright
+    let savesplitbelow=&splitbelow
+    let savesplitright=&splitright
+
+    " 'there' will be set to a command to move from the split window
+    " back to the explorer window
+    "
+    " 'back' will be set to a command to move from the explorer window
+    " back to the newly split window
+    "
+    " 'right' and 'below' will be set to the settings needed for
+    " splitbelow and splitright IF the explorer is the only window.
+    "
+    let there= g:NERDTreeWinPos ==# "left" ? "wincmd h" : "wincmd l"
+    let back = g:NERDTreeWinPos ==# "left" ? "wincmd l" : "wincmd h"
+    let right= g:NERDTreeWinPos ==# "left"
+    let below=0
+
+    " Attempt to go to adjacent window
+    call s:exec(back)
+
+    let onlyOneWin = (winnr("$") ==# 1)
+
+    " If no adjacent window, set splitright and splitbelow appropriately
+    if onlyOneWin
+        let &splitright=right
+        let &splitbelow=below
+    else
+        " found adjacent window - invert split direction
+        let &splitright=!right
+        let &splitbelow=!below
+    endif
+
+    let splitMode = onlyOneWin ? "vertical" : ""
+
+    " Open the new window
+    try
+        exec(splitMode." sp " . self.path.str({'format': 'Edit'}))
+    catch /^Vim\%((\a\+)\)\=:E37/
+        call s:putCursorInTreeWin()
+        throw "NERDTree.FileAlreadyOpenAndModifiedError: ". self.path.str() ." is already open and modified."
+    catch /^Vim\%((\a\+)\)\=:/
+        "do nothing
+    endtry
+
+    "resize the tree window if no other window was open before
+    if onlyOneWin
+        let size = exists("b:NERDTreeOldWindowSize") ? b:NERDTreeOldWindowSize : g:NERDTreeWinSize
+        call s:exec(there)
+        exec("silent ". splitMode ." resize ". size)
+        call s:exec('wincmd p')
+    endif
+
+    " Restore splitmode settings
+    let &splitbelow=savesplitbelow
+    let &splitright=savesplitright
+endfunction
+"FUNCTION: TreeFileNode.openVSplit() {{{3
+"Open this node in a new vertical window
+function! s:TreeFileNode.openVSplit()
+    if b:NERDTreeType ==# "secondary"
+        exec "vnew " . self.path.str({'format': 'Edit'})
+        return
+    endif
+
+    let winwidth = winwidth(".")
+    if winnr("$")==#1
+        let winwidth = g:NERDTreeWinSize
+    endif
+
+    call s:exec("wincmd p")
+    exec "vnew " . self.path.str({'format': 'Edit'})
+
+    "resize the nerd tree back to the original size
+    call s:putCursorInTreeWin()
+    exec("silent vertical resize ". winwidth)
+    call s:exec('wincmd p')
+endfunction
+"FUNCTION: TreeFileNode.openInNewTab(options) {{{3
+function! s:TreeFileNode.openInNewTab(options)
+    let currentTab = tabpagenr()
+
+    if !has_key(a:options, 'keepTreeOpen')
+        call s:closeTreeIfQuitOnOpen()
+    endif
+
+    exec "tabedit " . self.path.str({'format': 'Edit'})
+
+    if has_key(a:options, 'stayInCurrentTab') && a:options['stayInCurrentTab']
+        exec "tabnext " . currentTab
+    endif
+
+endfunction
+"FUNCTION: TreeFileNode.putCursorHere(isJump, recurseUpward){{{3
+"Places the cursor on the line number this node is rendered on
+"
+"Args:
+"isJump: 1 if this cursor movement should be counted as a jump by vim
+"recurseUpward: try to put the cursor on the parent if the this node isnt
+"visible
+function! s:TreeFileNode.putCursorHere(isJump, recurseUpward)
+    let ln = self.getLineNum()
+    if ln != -1
+        if a:isJump
+            mark '
+        endif
+        call cursor(ln, col("."))
+    else
+        if a:recurseUpward
+            let node = self
+            while node != {} && node.getLineNum() ==# -1
+                let node = node.parent
+                call node.open()
+            endwhile
+            call s:renderView()
+            call node.putCursorHere(a:isJump, 0)
+        endif
+    endif
+endfunction
+
+"FUNCTION: TreeFileNode.refresh() {{{3
+function! s:TreeFileNode.refresh()
+    call self.path.refresh()
+endfunction
+"FUNCTION: TreeFileNode.rename() {{{3
+"Calls the rename method for this nodes path obj
+function! s:TreeFileNode.rename(newName)
+    let newName = substitute(a:newName, '\(\\\|\/\)$', '', '')
+    call self.path.rename(newName)
+    call self.parent.removeChild(self)
+
+    let parentPath = self.path.getParent()
+    let newParent = b:NERDTreeRoot.findNode(parentPath)
+
+    if newParent != {}
+        call newParent.createChild(self.path, 1)
+        call newParent.refresh()
+    endif
+endfunction
+"FUNCTION: TreeFileNode.renderToString {{{3
+"returns a string representation for this tree to be rendered in the view
+function! s:TreeFileNode.renderToString()
+    return self._renderToString(0, 0, [], self.getChildCount() ==# 1)
+endfunction
+
+
+"Args:
+"depth: the current depth in the tree for this call
+"drawText: 1 if we should actually draw the line for this node (if 0 then the
+"child nodes are rendered only)
+"vertMap: a binary array that indicates whether a vertical bar should be draw
+"for each depth in the tree
+"isLastChild:true if this curNode is the last child of its parent
+function! s:TreeFileNode._renderToString(depth, drawText, vertMap, isLastChild)
+    let output = ""
+    if a:drawText ==# 1
+
+        let treeParts = ''
+
+        "get all the leading spaces and vertical tree parts for this line
+        if a:depth > 1
+            for j in a:vertMap[0:-2]
+                if j ==# 1
+                    let treeParts = treeParts . '| '
+                else
+                    let treeParts = treeParts . '  '
+                endif
+            endfor
+        endif
+
+        "get the last vertical tree part for this line which will be different
+        "if this node is the last child of its parent
+        if a:isLastChild
+            let treeParts = treeParts . '`'
+        else
+            let treeParts = treeParts . '|'
+        endif
+
+
+        "smack the appropriate dir/file symbol on the line before the file/dir
+        "name itself
+        if self.path.isDirectory
+            if self.isOpen
+                let treeParts = treeParts . '~'
+            else
+                let treeParts = treeParts . '+'
+            endif
+        else
+            let treeParts = treeParts . '-'
+        endif
+        let line = treeParts . self.displayString()
+
+        let output = output . line . "\n"
+    endif
+
+    "if the node is an open dir, draw its children
+    if self.path.isDirectory ==# 1 && self.isOpen ==# 1
+
+        let childNodesToDraw = self.getVisibleChildren()
+        if len(childNodesToDraw) > 0
+
+            "draw all the nodes children except the last
+            let lastIndx = len(childNodesToDraw)-1
+            if lastIndx > 0
+                for i in childNodesToDraw[0:lastIndx-1]
+                    let output = output . i._renderToString(a:depth + 1, 1, add(copy(a:vertMap), 1), 0)
+                endfor
+            endif
+
+            "draw the last child, indicating that it IS the last
+            let output = output . childNodesToDraw[lastIndx]._renderToString(a:depth + 1, 1, add(copy(a:vertMap), 0), 1)
+        endif
+    endif
+
+    return output
+endfunction
+"CLASS: TreeDirNode {{{2
+"This class is a child of the TreeFileNode class and constitutes the
+"'Composite' part of the composite design pattern between the treenode
+"classes.
+"============================================================
+let s:TreeDirNode = copy(s:TreeFileNode)
+"FUNCTION: TreeDirNode.AbsoluteTreeRoot(){{{3
+"class method that returns the highest cached ancestor of the current root
+function! s:TreeDirNode.AbsoluteTreeRoot()
+    let currentNode = b:NERDTreeRoot
+    while currentNode.parent != {}
+        let currentNode = currentNode.parent
+    endwhile
+    return currentNode
+endfunction
+"FUNCTION: TreeDirNode.activate(forceKeepWinOpen) {{{3
+unlet s:TreeDirNode.activate
+function! s:TreeDirNode.activate(forceKeepWinOpen)
+    call self.toggleOpen()
+    call s:renderView()
+    call self.putCursorHere(0, 0)
+endfunction
+"FUNCTION: TreeDirNode.addChild(treenode, inOrder) {{{3
+"Adds the given treenode to the list of children for this node
+"
+"Args:
+"-treenode: the node to add
+"-inOrder: 1 if the new node should be inserted in sorted order
+function! s:TreeDirNode.addChild(treenode, inOrder)
+    call add(self.children, a:treenode)
+    let a:treenode.parent = self
+
+    if a:inOrder
+        call self.sortChildren()
+    endif
+endfunction
+
+"FUNCTION: TreeDirNode.close() {{{3
+"Closes this directory
+function! s:TreeDirNode.close()
+    let self.isOpen = 0
+endfunction
+
+"FUNCTION: TreeDirNode.closeChildren() {{{3
+"Closes all the child dir nodes of this node
+function! s:TreeDirNode.closeChildren()
+    for i in self.children
+        if i.path.isDirectory
+            call i.close()
+            call i.closeChildren()
+        endif
+    endfor
+endfunction
+
+"FUNCTION: TreeDirNode.createChild(path, inOrder) {{{3
+"Instantiates a new child node for this node with the given path. The new
+"nodes parent is set to this node.
+"
+"Args:
+"path: a Path object that this node will represent/contain
+"inOrder: 1 if the new node should be inserted in sorted order
+"
+"Returns:
+"the newly created node
+function! s:TreeDirNode.createChild(path, inOrder)
+    let newTreeNode = s:TreeFileNode.New(a:path)
+    call self.addChild(newTreeNode, a:inOrder)
+    return newTreeNode
+endfunction
+
+"FUNCTION: TreeDirNode.findNode(path) {{{3
+"Will find one of the children (recursively) that has the given path
+"
+"Args:
+"path: a path object
+unlet s:TreeDirNode.findNode
+function! s:TreeDirNode.findNode(path)
+    if a:path.equals(self.path)
+        return self
+    endif
+    if stridx(a:path.str(), self.path.str(), 0) ==# -1
+        return {}
+    endif
+
+    if self.path.isDirectory
+        for i in self.children
+            let retVal = i.findNode(a:path)
+            if retVal != {}
+                return retVal
+            endif
+        endfor
+    endif
+    return {}
+endfunction
+"FUNCTION: TreeDirNode.getChildCount() {{{3
+"Returns the number of children this node has
+function! s:TreeDirNode.getChildCount()
+    return len(self.children)
+endfunction
+
+"FUNCTION: TreeDirNode.getChild(path) {{{3
+"Returns child node of this node that has the given path or {} if no such node
+"exists.
+"
+"This function doesnt not recurse into child dir nodes
+"
+"Args:
+"path: a path object
+function! s:TreeDirNode.getChild(path)
+    if stridx(a:path.str(), self.path.str(), 0) ==# -1
+        return {}
+    endif
+
+    let index = self.getChildIndex(a:path)
+    if index ==# -1
+        return {}
+    else
+        return self.children[index]
+    endif
+
+endfunction
+
+"FUNCTION: TreeDirNode.getChildByIndex(indx, visible) {{{3
+"returns the child at the given index
+"Args:
+"indx: the index to get the child from
+"visible: 1 if only the visible children array should be used, 0 if all the
+"children should be searched.
+function! s:TreeDirNode.getChildByIndex(indx, visible)
+    let array_to_search = a:visible? self.getVisibleChildren() : self.children
+    if a:indx > len(array_to_search)
+        throw "NERDTree.InvalidArgumentsError: Index is out of bounds."
+    endif
+    return array_to_search[a:indx]
+endfunction
+
+"FUNCTION: TreeDirNode.getChildIndex(path) {{{3
+"Returns the index of the child node of this node that has the given path or
+"-1 if no such node exists.
+"
+"This function doesnt not recurse into child dir nodes
+"
+"Args:
+"path: a path object
+function! s:TreeDirNode.getChildIndex(path)
+    if stridx(a:path.str(), self.path.str(), 0) ==# -1
+        return -1
+    endif
+
+    "do a binary search for the child
+    let a = 0
+    let z = self.getChildCount()
+    while a < z
+        let mid = (a+z)/2
+        let diff = a:path.compareTo(self.children[mid].path)
+
+        if diff ==# -1
+            let z = mid
+        elseif diff ==# 1
+            let a = mid+1
+        else
+            return mid
+        endif
+    endwhile
+    return -1
+endfunction
+
+"FUNCTION: TreeDirNode.GetSelected() {{{3
+"Returns the current node if it is a dir node, or else returns the current
+"nodes parent
+unlet s:TreeDirNode.GetSelected
+function! s:TreeDirNode.GetSelected()
+    let currentDir = s:TreeFileNode.GetSelected()
+    if currentDir != {} && !currentDir.isRoot()
+        if currentDir.path.isDirectory ==# 0
+            let currentDir = currentDir.parent
+        endif
+    endif
+    return currentDir
+endfunction
+"FUNCTION: TreeDirNode.getVisibleChildCount() {{{3
+"Returns the number of visible children this node has
+function! s:TreeDirNode.getVisibleChildCount()
+    return len(self.getVisibleChildren())
+endfunction
+
+"FUNCTION: TreeDirNode.getVisibleChildren() {{{3
+"Returns a list of children to display for this node, in the correct order
+"
+"Return:
+"an array of treenodes
+function! s:TreeDirNode.getVisibleChildren()
+    let toReturn = []
+    for i in self.children
+        if i.path.ignore() ==# 0
+            call add(toReturn, i)
+        endif
+    endfor
+    return toReturn
+endfunction
+
+"FUNCTION: TreeDirNode.hasVisibleChildren() {{{3
+"returns 1 if this node has any childre, 0 otherwise..
+function! s:TreeDirNode.hasVisibleChildren()
+    return self.getVisibleChildCount() != 0
+endfunction
+
+"FUNCTION: TreeDirNode._initChildren() {{{3
+"Removes all childen from this node and re-reads them
+"
+"Args:
+"silent: 1 if the function should not echo any "please wait" messages for
+"large directories
+"
+"Return: the number of child nodes read
+function! s:TreeDirNode._initChildren(silent)
+    "remove all the current child nodes
+    let self.children = []
+
+    "get an array of all the files in the nodes dir
+    let dir = self.path
+    let globDir = dir.str({'format': 'Glob'})
+    let filesStr = globpath(globDir, '*') . "\n" . globpath(globDir, '.*')
+    let files = split(filesStr, "\n")
+
+    if !a:silent && len(files) > g:NERDTreeNotificationThreshold
+        call s:echo("Please wait, caching a large dir ...")
+    endif
+
+    let invalidFilesFound = 0
+    for i in files
+
+        "filter out the .. and . directories
+        "Note: we must match .. AND ../ cos sometimes the globpath returns
+        "../ for path with strange chars (eg $)
+        if i !~ '\/\.\.\/\?$' && i !~ '\/\.\/\?$'
+
+            "put the next file in a new node and attach it
+            try
+                let path = s:Path.New(i)
+                call self.createChild(path, 0)
+            catch /^NERDTree.\(InvalidArguments\|InvalidFiletype\)Error/
+                let invalidFilesFound += 1
+            endtry
+        endif
+    endfor
+
+    call self.sortChildren()
+
+    if !a:silent && len(files) > g:NERDTreeNotificationThreshold
+        call s:echo("Please wait, caching a large dir ... DONE (". self.getChildCount() ." nodes cached).")
+    endif
+
+    if invalidFilesFound
+        call s:echoWarning(invalidFilesFound . " file(s) could not be loaded into the NERD tree")
+    endif
+    return self.getChildCount()
+endfunction
+"FUNCTION: TreeDirNode.New(path) {{{3
+"Returns a new TreeNode object with the given path and parent
+"
+"Args:
+"path: a path object representing the full filesystem path to the file/dir that the node represents
+unlet s:TreeDirNode.New
+function! s:TreeDirNode.New(path)
+    if a:path.isDirectory != 1
+        throw "NERDTree.InvalidArgumentsError: A TreeDirNode object must be instantiated with a directory Path object."
+    endif
+
+    let newTreeNode = copy(self)
+    let newTreeNode.path = a:path
+
+    let newTreeNode.isOpen = 0
+    let newTreeNode.children = []
+
+    let newTreeNode.parent = {}
+
+    return newTreeNode
+endfunction
+"FUNCTION: TreeDirNode.open() {{{3
+"Reads in all this nodes children
+"
+"Return: the number of child nodes read
+unlet s:TreeDirNode.open
+function! s:TreeDirNode.open()
+    let self.isOpen = 1
+    if self.children ==# []
+        return self._initChildren(0)
+    else
+        return 0
+    endif
+endfunction
+
+" FUNCTION: TreeDirNode.openExplorer() {{{3
+" opens an explorer window for this node in the previous window (could be a
+" nerd tree or a netrw)
+function! s:TreeDirNode.openExplorer()
+    let oldwin = winnr()
+    call s:exec('wincmd p')
+    if oldwin ==# winnr() || (&modified && s:bufInWindows(winbufnr(winnr())) < 2)
+        call s:exec('wincmd p')
+        call self.openSplit()
+    else
+        exec ("silent edit " . self.path.str({'format': 'Edit'}))
+    endif
+endfunction
+"FUNCTION: TreeDirNode.openInNewTab(options) {{{3
+unlet s:TreeDirNode.openInNewTab
+function! s:TreeDirNode.openInNewTab(options)
+    let currentTab = tabpagenr()
+
+    if !has_key(a:options, 'keepTreeOpen') || !a:options['keepTreeOpen']
+        call s:closeTreeIfQuitOnOpen()
+    endif
+
+    tabnew
+    call s:initNerdTree(self.path.str())
+
+    if has_key(a:options, 'stayInCurrentTab') && a:options['stayInCurrentTab']
+        exec "tabnext " . currentTab
+    endif
+endfunction
+"FUNCTION: TreeDirNode.openRecursively() {{{3
+"Opens this treenode and all of its children whose paths arent 'ignored'
+"because of the file filters.
+"
+"This method is actually a wrapper for the OpenRecursively2 method which does
+"the work.
+function! s:TreeDirNode.openRecursively()
+    call self._openRecursively2(1)
+endfunction
+
+"FUNCTION: TreeDirNode._openRecursively2() {{{3
+"Opens this all children of this treenode recursively if either:
+"   *they arent filtered by file filters
+"   *a:forceOpen is 1
+"
+"Args:
+"forceOpen: 1 if this node should be opened regardless of file filters
+function! s:TreeDirNode._openRecursively2(forceOpen)
+    if self.path.ignore() ==# 0 || a:forceOpen
+        let self.isOpen = 1
+        if self.children ==# []
+            call self._initChildren(1)
+        endif
+
+        for i in self.children
+            if i.path.isDirectory ==# 1
+                call i._openRecursively2(0)
+            endif
+        endfor
+    endif
+endfunction
+
+"FUNCTION: TreeDirNode.refresh() {{{3
+unlet s:TreeDirNode.refresh
+function! s:TreeDirNode.refresh()
+    call self.path.refresh()
+
+    "if this node was ever opened, refresh its children
+    if self.isOpen || !empty(self.children)
+        "go thru all the files/dirs under this node
+        let newChildNodes = []
+        let invalidFilesFound = 0
+        let dir = self.path
+        let globDir = dir.str({'format': 'Glob'})
+        let filesStr = globpath(globDir, '*') . "\n" . globpath(globDir, '.*')
+        let files = split(filesStr, "\n")
+        for i in files
+            "filter out the .. and . directories
+            "Note: we must match .. AND ../ cos sometimes the globpath returns
+            "../ for path with strange chars (eg $)
+            if i !~ '\/\.\.\/\?$' && i !~ '\/\.\/\?$'
+
+                try
+                    "create a new path and see if it exists in this nodes children
+                    let path = s:Path.New(i)
+                    let newNode = self.getChild(path)
+                    if newNode != {}
+                        call newNode.refresh()
+                        call add(newChildNodes, newNode)
+
+                    "the node doesnt exist so create it
+                    else
+                        let newNode = s:TreeFileNode.New(path)
+                        let newNode.parent = self
+                        call add(newChildNodes, newNode)
+                    endif
+
+
+                catch /^NERDTree.InvalidArgumentsError/
+                    let invalidFilesFound = 1
+                endtry
+            endif
+        endfor
+
+        "swap this nodes children out for the children we just read/refreshed
+        let self.children = newChildNodes
+        call self.sortChildren()
+
+        if invalidFilesFound
+            call s:echoWarning("some files could not be loaded into the NERD tree")
+        endif
+    endif
+endfunction
+
+"FUNCTION: TreeDirNode.reveal(path) {{{3
+"reveal the given path, i.e. cache and open all treenodes needed to display it
+"in the UI
+function! s:TreeDirNode.reveal(path)
+    if !a:path.isUnder(self.path)
+        throw "NERDTree.InvalidArgumentsError: " . a:path.str() . " should be under " . self.path.str()
+    endif
+
+    call self.open()
+
+    if self.path.equals(a:path.getParent())
+        let n = self.findNode(a:path)
+        call s:renderView()
+        call n.putCursorHere(1,0)
+        return
+    endif
+
+    let p = a:path
+    while !p.getParent().equals(self.path)
+        let p = p.getParent()
+    endwhile
+
+    let n = self.findNode(p)
+    call n.reveal(a:path)
+endfunction
+"FUNCTION: TreeDirNode.removeChild(treenode) {{{3
+"
+"Removes the given treenode from this nodes set of children
+"
+"Args:
+"treenode: the node to remove
+"
+"Throws a NERDTree.ChildNotFoundError if the given treenode is not found
+function! s:TreeDirNode.removeChild(treenode)
+    for i in range(0, self.getChildCount()-1)
+        if self.children[i].equals(a:treenode)
+            call remove(self.children, i)
+            return
+        endif
+    endfor
+
+    throw "NERDTree.ChildNotFoundError: child node was not found"
+endfunction
+
+"FUNCTION: TreeDirNode.sortChildren() {{{3
+"
+"Sorts the children of this node according to alphabetical order and the
+"directory priority.
+"
+function! s:TreeDirNode.sortChildren()
+    let CompareFunc = function("s:compareNodes")
+    call sort(self.children, CompareFunc)
+endfunction
+
+"FUNCTION: TreeDirNode.toggleOpen() {{{3
+"Opens this directory if it is closed and vice versa
+function! s:TreeDirNode.toggleOpen()
+    if self.isOpen ==# 1
+        call self.close()
+    else
+        call self.open()
+    endif
+endfunction
+
+"FUNCTION: TreeDirNode.transplantChild(newNode) {{{3
+"Replaces the child of this with the given node (where the child node's full
+"path matches a:newNode's fullpath). The search for the matching node is
+"non-recursive
+"
+"Arg:
+"newNode: the node to graft into the tree
+function! s:TreeDirNode.transplantChild(newNode)
+    for i in range(0, self.getChildCount()-1)
+        if self.children[i].equals(a:newNode)
+            let self.children[i] = a:newNode
+            let a:newNode.parent = self
+            break
+        endif
+    endfor
+endfunction
+"============================================================
+"CLASS: Path {{{2
+"============================================================
+let s:Path = {}
+"FUNCTION: Path.AbsolutePathFor(str) {{{3
+function! s:Path.AbsolutePathFor(str)
+    let prependCWD = 0
+    if s:running_windows
+        let prependCWD = a:str !~ '^.:\(\\\|\/\)'
+    else
+        let prependCWD = a:str !~ '^/'
+    endif
+
+    let toReturn = a:str
+    if prependCWD
+        let toReturn = getcwd() . s:Path.Slash() . a:str
+    endif
+
+    return toReturn
+endfunction
+"FUNCTION: Path.bookmarkNames() {{{3
+function! s:Path.bookmarkNames()
+    if !exists("self._bookmarkNames")
+        call self.cacheDisplayString()
+    endif
+    return self._bookmarkNames
+endfunction
+"FUNCTION: Path.cacheDisplayString() {{{3
+function! s:Path.cacheDisplayString()
+    let self.cachedDisplayString = self.getLastPathComponent(1)
+
+    if self.isExecutable
+        let self.cachedDisplayString = self.cachedDisplayString . '*'
+    endif
+
+    let self._bookmarkNames = []
+    for i in s:Bookmark.Bookmarks()
+        if i.path.equals(self)
+            call add(self._bookmarkNames, i.name)
+        endif
+    endfor
+    if !empty(self._bookmarkNames)
+        let self.cachedDisplayString .= ' {' . join(self._bookmarkNames) . '}'
+    endif
+
+    if self.isSymLink
+        let self.cachedDisplayString .=  ' -> ' . self.symLinkDest
+    endif
+
+    if self.isReadOnly
+        let self.cachedDisplayString .=  ' [RO]'
+    endif
+endfunction
+"FUNCTION: Path.changeToDir() {{{3
+function! s:Path.changeToDir()
+    let dir = self.str({'format': 'Cd'})
+    if self.isDirectory ==# 0
+        let dir = self.getParent().str({'format': 'Cd'})
+    endif
+
+    try
+        execute "cd " . dir
+        call s:echo("CWD is now: " . getcwd())
+    catch
+        throw "NERDTree.PathChangeError: cannot change CWD to " . dir
+    endtry
+endfunction
+
+"FUNCTION: Path.compareTo() {{{3
+"
+"Compares this Path to the given path and returns 0 if they are equal, -1 if
+"this Path is "less than" the given path, or 1 if it is "greater".
+"
+"Args:
+"path: the path object to compare this to
+"
+"Return:
+"1, -1 or 0
+function! s:Path.compareTo(path)
+    let thisPath = self.getLastPathComponent(1)
+    let thatPath = a:path.getLastPathComponent(1)
+
+    "if the paths are the same then clearly we return 0
+    if thisPath ==# thatPath
+        return 0
+    endif
+
+    let thisSS = self.getSortOrderIndex()
+    let thatSS = a:path.getSortOrderIndex()
+
+    "compare the sort sequences, if they are different then the return
+    "value is easy
+    if thisSS < thatSS
+        return -1
+    elseif thisSS > thatSS
+        return 1
+    else
+        "if the sort sequences are the same then compare the paths
+        "alphabetically
+        let pathCompare = g:NERDTreeCaseSensitiveSort ? thisPath <# thatPath : thisPath <? thatPath
+        if pathCompare
+            return -1
+        else
+            return 1
+        endif
+    endif
+endfunction
+
+"FUNCTION: Path.Create(fullpath) {{{3
+"
+"Factory method.
+"
+"Creates a path object with the given path. The path is also created on the
+"filesystem. If the path already exists, a NERDTree.Path.Exists exception is
+"thrown. If any other errors occur, a NERDTree.Path exception is thrown.
+"
+"Args:
+"fullpath: the full filesystem path to the file/dir to create
+function! s:Path.Create(fullpath)
+    "bail if the a:fullpath already exists
+    if isdirectory(a:fullpath) || filereadable(a:fullpath)
+        throw "NERDTree.CreatePathError: Directory Exists: '" . a:fullpath . "'"
+    endif
+
+    try
+
+        "if it ends with a slash, assume its a dir create it
+        if a:fullpath =~ '\(\\\|\/\)$'
+            "whack the trailing slash off the end if it exists
+            let fullpath = substitute(a:fullpath, '\(\\\|\/\)$', '', '')
+
+            call mkdir(fullpath, 'p')
+
+        "assume its a file and create
+        else
+            call writefile([], a:fullpath)
+        endif
+    catch
+        throw "NERDTree.CreatePathError: Could not create path: '" . a:fullpath . "'"
+    endtry
+
+    return s:Path.New(a:fullpath)
+endfunction
+
+"FUNCTION: Path.copy(dest) {{{3
+"
+"Copies the file/dir represented by this Path to the given location
+"
+"Args:
+"dest: the location to copy this dir/file to
+function! s:Path.copy(dest)
+    if !s:Path.CopyingSupported()
+        throw "NERDTree.CopyingNotSupportedError: Copying is not supported on this OS"
+    endif
+
+    let dest = s:Path.WinToUnixPath(a:dest)
+
+    let cmd = g:NERDTreeCopyCmd . " " . self.str() . " " . dest
+    let success = system(cmd)
+    if success != 0
+        throw "NERDTree.CopyError: Could not copy ''". self.str() ."'' to: '" . a:dest . "'"
+    endif
+endfunction
+
+"FUNCTION: Path.CopyingSupported() {{{3
+"
+"returns 1 if copying is supported for this OS
+function! s:Path.CopyingSupported()
+    return exists('g:NERDTreeCopyCmd')
+endfunction
+
+
+"FUNCTION: Path.copyingWillOverwrite(dest) {{{3
+"
+"returns 1 if copy this path to the given location will cause files to
+"overwritten
+"
+"Args:
+"dest: the location this path will be copied to
+function! s:Path.copyingWillOverwrite(dest)
+    if filereadable(a:dest)
+        return 1
+    endif
+
+    if isdirectory(a:dest)
+        let path = s:Path.JoinPathStrings(a:dest, self.getLastPathComponent(0))
+        if filereadable(path)
+            return 1
+        endif
+    endif
+endfunction
+
+"FUNCTION: Path.delete() {{{3
+"
+"Deletes the file represented by this path.
+"Deletion of directories is not supported
+"
+"Throws NERDTree.Path.Deletion exceptions
+function! s:Path.delete()
+    if self.isDirectory
+
+        let cmd = g:NERDTreeRemoveDirCmd . self.str({'escape': 1})
+        let success = system(cmd)
+
+        if v:shell_error != 0
+            throw "NERDTree.PathDeletionError: Could not delete directory: '" . self.str() . "'"
+        endif
+    else
+        let success = delete(self.str())
+        if success != 0
+            throw "NERDTree.PathDeletionError: Could not delete file: '" . self.str() . "'"
+        endif
+    endif
+
+    "delete all bookmarks for this path
+    for i in self.bookmarkNames()
+        let bookmark = s:Bookmark.BookmarkFor(i)
+        call bookmark.delete()
+    endfor
+endfunction
+
+"FUNCTION: Path.displayString() {{{3
+"
+"Returns a string that specifies how the path should be represented as a
+"string
+function! s:Path.displayString()
+    if self.cachedDisplayString ==# ""
+        call self.cacheDisplayString()
+    endif
+
+    return self.cachedDisplayString
+endfunction
+"FUNCTION: Path.extractDriveLetter(fullpath) {{{3
+"
+"If running windows, cache the drive letter for this path
+function! s:Path.extractDriveLetter(fullpath)
+    if s:running_windows
+        let self.drive = substitute(a:fullpath, '\(^[a-zA-Z]:\).*', '\1', '')
+    else
+        let self.drive = ''
+    endif
+
+endfunction
+"FUNCTION: Path.exists() {{{3
+"return 1 if this path points to a location that is readable or is a directory
+function! s:Path.exists()
+    let p = self.str()
+    return filereadable(p) || isdirectory(p)
+endfunction
+"FUNCTION: Path.getDir() {{{3
+"
+"Returns this path if it is a directory, else this paths parent.
+"
+"Return:
+"a Path object
+function! s:Path.getDir()
+    if self.isDirectory
+        return self
+    else
+        return self.getParent()
+    endif
+endfunction
+"FUNCTION: Path.getParent() {{{3
+"
+"Returns a new path object for this paths parent
+"
+"Return:
+"a new Path object
+function! s:Path.getParent()
+    if s:running_windows
+        let path = self.drive . '\' . join(self.pathSegments[0:-2], '\')
+    else
+        let path = '/'. join(self.pathSegments[0:-2], '/')
+    endif
+
+    return s:Path.New(path)
+endfunction
+"FUNCTION: Path.getLastPathComponent(dirSlash) {{{3
+"
+"Gets the last part of this path.
+"
+"Args:
+"dirSlash: if 1 then a trailing slash will be added to the returned value for
+"directory nodes.
+function! s:Path.getLastPathComponent(dirSlash)
+    if empty(self.pathSegments)
+        return ''
+    endif
+    let toReturn = self.pathSegments[-1]
+    if a:dirSlash && self.isDirectory
+        let toReturn = toReturn . '/'
+    endif
+    return toReturn
+endfunction
+
+"FUNCTION: Path.getSortOrderIndex() {{{3
+"returns the index of the pattern in g:NERDTreeSortOrder that this path matches
+function! s:Path.getSortOrderIndex()
+    let i = 0
+    while i < len(g:NERDTreeSortOrder)
+        if  self.getLastPathComponent(1) =~ g:NERDTreeSortOrder[i]
+            return i
+        endif
+        let i = i + 1
+    endwhile
+    return s:NERDTreeSortStarIndex
+endfunction
+
+"FUNCTION: Path.ignore() {{{3
+"returns true if this path should be ignored
+function! s:Path.ignore()
+    let lastPathComponent = self.getLastPathComponent(0)
+
+    "filter out the user specified paths to ignore
+    if b:NERDTreeIgnoreEnabled
+        for i in g:NERDTreeIgnore
+            if lastPathComponent =~ i
+                return 1
+            endif
+        endfor
+    endif
+
+    "dont show hidden files unless instructed to
+    if b:NERDTreeShowHidden ==# 0 && lastPathComponent =~ '^\.'
+        return 1
+    endif
+
+    if b:NERDTreeShowFiles ==# 0 && self.isDirectory ==# 0
+        return 1
+    endif
+
+    return 0
+endfunction
+
+"FUNCTION: Path.isUnder(path) {{{3
+"return 1 if this path is somewhere under the given path in the filesystem.
+"
+"a:path should be a dir
+function! s:Path.isUnder(path)
+    if a:path.isDirectory == 0
+        return 0
+    endif
+
+    let this = self.str()
+    let that = a:path.str()
+    return stridx(this, that . s:Path.Slash()) == 0
+endfunction
+
+"FUNCTION: Path.JoinPathStrings(...) {{{3
+function! s:Path.JoinPathStrings(...)
+    let components = []
+    for i in a:000
+        let components = extend(components, split(i, '/'))
+    endfor
+    return '/' . join(components, '/')
+endfunction
+
+"FUNCTION: Path.equals() {{{3
+"
+"Determines whether 2 path objects are "equal".
+"They are equal if the paths they represent are the same
+"
+"Args:
+"path: the other path obj to compare this with
+function! s:Path.equals(path)
+    return self.str() ==# a:path.str()
+endfunction
+
+"FUNCTION: Path.New() {{{3
+"The Constructor for the Path object
+function! s:Path.New(path)
+    let newPath = copy(self)
+
+    call newPath.readInfoFromDisk(s:Path.AbsolutePathFor(a:path))
+
+    let newPath.cachedDisplayString = ""
+
+    return newPath
+endfunction
+
+"FUNCTION: Path.Slash() {{{3
+"return the slash to use for the current OS
+function! s:Path.Slash()
+    return s:running_windows ? '\' : '/'
+endfunction
+
+"FUNCTION: Path.readInfoFromDisk(fullpath) {{{3
+"
+"
+"Throws NERDTree.Path.InvalidArguments exception.
+function! s:Path.readInfoFromDisk(fullpath)
+    call self.extractDriveLetter(a:fullpath)
+
+    let fullpath = s:Path.WinToUnixPath(a:fullpath)
+
+    if getftype(fullpath) ==# "fifo"
+        throw "NERDTree.InvalidFiletypeError: Cant handle FIFO files: " . a:fullpath
+    endif
+
+    let self.pathSegments = split(fullpath, '/')
+
+    let self.isReadOnly = 0
+    if isdirectory(a:fullpath)
+        let self.isDirectory = 1
+    elseif filereadable(a:fullpath)
+        let self.isDirectory = 0
+        let self.isReadOnly = filewritable(a:fullpath) ==# 0
+    else
+        throw "NERDTree.InvalidArgumentsError: Invalid path = " . a:fullpath
+    endif
+
+    let self.isExecutable = 0
+    if !self.isDirectory
+        let self.isExecutable = getfperm(a:fullpath) =~ 'x'
+    endif
+
+    "grab the last part of the path (minus the trailing slash)
+    let lastPathComponent = self.getLastPathComponent(0)
+
+    "get the path to the new node with the parent dir fully resolved
+    let hardPath = resolve(self.strTrunk()) . '/' . lastPathComponent
+
+    "if  the last part of the path is a symlink then flag it as such
+    let self.isSymLink = (resolve(hardPath) != hardPath)
+    if self.isSymLink
+        let self.symLinkDest = resolve(fullpath)
+
+        "if the link is a dir then slap a / on the end of its dest
+        if isdirectory(self.symLinkDest)
+
+            "we always wanna treat MS windows shortcuts as files for
+            "simplicity
+            if hardPath !~ '\.lnk$'
+
+                let self.symLinkDest = self.symLinkDest . '/'
+            endif
+        endif
+    endif
+endfunction
+
+"FUNCTION: Path.refresh() {{{3
+function! s:Path.refresh()
+    call self.readInfoFromDisk(self.str())
+    call self.cacheDisplayString()
+endfunction
+
+"FUNCTION: Path.rename() {{{3
+"
+"Renames this node on the filesystem
+function! s:Path.rename(newPath)
+    if a:newPath ==# ''
+        throw "NERDTree.InvalidArgumentsError: Invalid newPath for renaming = ". a:newPath
+    endif
+
+    let success =  rename(self.str(), a:newPath)
+    if success != 0
+        throw "NERDTree.PathRenameError: Could not rename: '" . self.str() . "'" . 'to:' . a:newPath
+    endif
+    call self.readInfoFromDisk(a:newPath)
+
+    for i in self.bookmarkNames()
+        let b = s:Bookmark.BookmarkFor(i)
+        call b.setPath(copy(self))
+    endfor
+    call s:Bookmark.Write()
+endfunction
+
+"FUNCTION: Path.str() {{{3
+"
+"Returns a string representation of this Path
+"
+"Takes an optional dictionary param to specify how the output should be
+"formatted.
+"
+"The dict may have the following keys:
+"  'format'
+"  'escape'
+"  'truncateTo'
+"
+"The 'format' key may have a value of:
+"  'Cd' - a string to be used with the :cd command
+"  'Edit' - a string to be used with :e :sp :new :tabedit etc
+"  'UI' - a string used in the NERD tree UI
+"
+"The 'escape' key, if specified will cause the output to be escaped with
+"shellescape()
+"
+"The 'truncateTo' key causes the resulting string to be truncated to the value
+"'truncateTo' maps to. A '<' char will be prepended.
+function! s:Path.str(...)
+    let options = a:0 ? a:1 : {}
+    let toReturn = ""
+
+    if has_key(options, 'format')
+        let format = options['format']
+        if has_key(self, '_strFor' . format)
+            exec 'let toReturn = self._strFor' . format . '()'
+        else
+            raise 'NERDTree.UnknownFormatError: unknown format "'. format .'"'
+        endif
+    else
+        let toReturn = self._str()
+    endif
+
+    if has_key(options, 'escape') && options['escape']
+        let toReturn = shellescape(toReturn)
+    endif
+
+    if has_key(options, 'truncateTo')
+        let limit = options['truncateTo']
+        if len(toReturn) > limit
+            let toReturn = "<" . strpart(toReturn, len(toReturn) - limit + 1)
+        endif
+    endif
+
+    return toReturn
+endfunction
+
+"FUNCTION: Path._strForUI() {{{3
+function! s:Path._strForUI()
+    let toReturn = '/' . join(self.pathSegments, '/')
+    if self.isDirectory && toReturn != '/'
+        let toReturn  = toReturn . '/'
+    endif
+    return toReturn
+endfunction
+
+"FUNCTION: Path._strForCd() {{{3
+"
+" returns a string that can be used with :cd
+function! s:Path._strForCd()
+    return escape(self.str(), s:escape_chars)
+endfunction
+"FUNCTION: Path._strForEdit() {{{3
+"
+"Return: the string for this path that is suitable to be used with the :edit
+"command
+function! s:Path._strForEdit()
+    let p = self.str({'format': 'UI'})
+    let cwd = getcwd()
+
+    if s:running_windows
+        let p = tolower(self.str())
+        let cwd = tolower(getcwd())
+    endif
+
+    let p = escape(p, s:escape_chars)
+
+    let cwd = cwd . s:Path.Slash()
+
+    "return a relative path if we can
+    if stridx(p, cwd) ==# 0
+        let p = strpart(p, strlen(cwd))
+    endif
+
+    if p ==# ''
+        let p = '.'
+    endif
+
+    return p
+
+endfunction
+"FUNCTION: Path._strForGlob() {{{3
+function! s:Path._strForGlob()
+    let lead = s:Path.Slash()
+
+    "if we are running windows then slap a drive letter on the front
+    if s:running_windows
+        let lead = self.drive . '\'
+    endif
+
+    let toReturn = lead . join(self.pathSegments, s:Path.Slash())
+
+    if !s:running_windows
+        let toReturn = escape(toReturn, s:escape_chars)
+    endif
+    return toReturn
+endfunction
+"FUNCTION: Path._str() {{{3
+"
+"Gets the string path for this path object that is appropriate for the OS.
+"EG, in windows c:\foo\bar
+"    in *nix  /foo/bar
+function! s:Path._str()
+    let lead = s:Path.Slash()
+
+    "if we are running windows then slap a drive letter on the front
+    if s:running_windows
+        let lead = self.drive . '\'
+    endif
+
+    return lead . join(self.pathSegments, s:Path.Slash())
+endfunction
+
+"FUNCTION: Path.strTrunk() {{{3
+"Gets the path without the last segment on the end.
+function! s:Path.strTrunk()
+    return self.drive . '/' . join(self.pathSegments[0:-2], '/')
+endfunction
+
+"FUNCTION: Path.WinToUnixPath(pathstr){{{3
+"Takes in a windows path and returns the unix equiv
+"
+"A class level method
+"
+"Args:
+"pathstr: the windows path to convert
+function! s:Path.WinToUnixPath(pathstr)
+    if !s:running_windows
+        return a:pathstr
+    endif
+
+    let toReturn = a:pathstr
+
+    "remove the x:\ of the front
+    let toReturn = substitute(toReturn, '^.*:\(\\\|/\)\?', '/', "")
+
+    "convert all \ chars to /
+    let toReturn = substitute(toReturn, '\', '/', "g")
+
+    return toReturn
+endfunction
+
+" SECTION: General Functions {{{1
+"============================================================
+"FUNCTION: s:bufInWindows(bnum){{{2
+"[[STOLEN FROM VTREEEXPLORER.VIM]]
+"Determine the number of windows open to this buffer number.
+"Care of Yegappan Lakshman.  Thanks!
+"
+"Args:
+"bnum: the subject buffers buffer number
+function! s:bufInWindows(bnum)
+    let cnt = 0
+    let winnum = 1
+    while 1
+        let bufnum = winbufnr(winnum)
+        if bufnum < 0
+            break
+        endif
+        if bufnum ==# a:bnum
+            let cnt = cnt + 1
+        endif
+        let winnum = winnum + 1
+    endwhile
+
+    return cnt
+endfunction " >>>
+"FUNCTION: s:checkForBrowse(dir) {{{2
+"inits a secondary nerd tree in the current buffer if appropriate
+function! s:checkForBrowse(dir)
+    if a:dir != '' && isdirectory(a:dir)
+        call s:initNerdTreeInPlace(a:dir)
+    endif
+endfunction
+"FUNCTION: s:compareBookmarks(first, second) {{{2
+"Compares two bookmarks
+function! s:compareBookmarks(first, second)
+    return a:first.compareTo(a:second)
+endfunction
+
+" FUNCTION: s:completeBookmarks(A,L,P) {{{2
+" completion function for the bookmark commands
+function! s:completeBookmarks(A,L,P)
+    return filter(s:Bookmark.BookmarkNames(), 'v:val =~ "^' . a:A . '"')
+endfunction
+" FUNCTION: s:exec(cmd) {{{2
+" same as :exec cmd  but eventignore=all is set for the duration
+function! s:exec(cmd)
+    let old_ei = &ei
+    set ei=all
+    exec a:cmd
+    let &ei = old_ei
+endfunction
+" FUNCTION: s:findAndRevealPath() {{{2
+function! s:findAndRevealPath()
+    try
+        let p = s:Path.New(expand("%"))
+    catch /^NERDTree.InvalidArgumentsError/
+        call s:echo("no file for the current buffer")
+        return
+    endtry
+
+    if !s:treeExistsForTab()
+        call s:initNerdTree(p.getParent().str())
+    else
+        if !p.isUnder(s:TreeFileNode.GetRootForTab().path)
+            call s:initNerdTree(p.getParent().str())
+        else
+            if !s:isTreeOpen()
+                call s:toggle("")
+            endif
+        endif
+    endif
+    call s:putCursorInTreeWin()
+    call b:NERDTreeRoot.reveal(p)
+endfunction
+"FUNCTION: s:initNerdTree(name) {{{2
+"Initialise the nerd tree for this tab. The tree will start in either the
+"given directory, or the directory associated with the given bookmark
+"
+"Args:
+"name: the name of a bookmark or a directory
+function! s:initNerdTree(name)
+    let path = {}
+    if s:Bookmark.BookmarkExistsFor(a:name)
+        let path = s:Bookmark.BookmarkFor(a:name).path
+    else
+        let dir = a:name ==# '' ? getcwd() : a:name
+
+        "hack to get an absolute path if a relative path is given
+        if dir =~ '^\.'
+            let dir = getcwd() . s:Path.Slash() . dir
+        endif
+        let dir = resolve(dir)
+
+        try
+            let path = s:Path.New(dir)
+        catch /^NERDTree.InvalidArgumentsError/
+            call s:echo("No bookmark or directory found for: " . a:name)
+            return
+        endtry
+    endif
+    if !path.isDirectory
+        let path = path.getParent()
+    endif
+
+    "if instructed to, then change the vim CWD to the dir the NERDTree is
+    "inited in
+    if g:NERDTreeChDirMode != 0
+        call path.changeToDir()
+    endif
+
+    if s:treeExistsForTab()
+        if s:isTreeOpen()
+            call s:closeTree()
+        endif
+        unlet t:NERDTreeBufName
+    endif
+
+    let newRoot = s:TreeDirNode.New(path)
+    call newRoot.open()
+
+    call s:createTreeWin()
+    let b:treeShowHelp = 0
+    let b:NERDTreeIgnoreEnabled = 1
+    let b:NERDTreeShowFiles = g:NERDTreeShowFiles
+    let b:NERDTreeShowHidden = g:NERDTreeShowHidden
+    let b:NERDTreeShowBookmarks = g:NERDTreeShowBookmarks
+    let b:NERDTreeRoot = newRoot
+
+    let b:NERDTreeType = "primary"
+
+    call s:renderView()
+    call b:NERDTreeRoot.putCursorHere(0, 0)
+endfunction
+
+"FUNCTION: s:initNerdTreeInPlace(dir) {{{2
+function! s:initNerdTreeInPlace(dir)
+    try
+        let path = s:Path.New(a:dir)
+    catch /^NERDTree.InvalidArgumentsError/
+        call s:echo("Invalid directory name:" . a:name)
+        return
+    endtry
+
+    "we want the directory buffer to disappear when we do the :edit below
+    setlocal bufhidden=wipe
+
+    let previousBuf = expand("#")
+
+    "we need a unique name for each secondary tree buffer to ensure they are
+    "all independent
+    exec "silent edit " . s:nextBufferName()
+
+    let b:NERDTreePreviousBuf = bufnr(previousBuf)
+
+    let b:NERDTreeRoot = s:TreeDirNode.New(path)
+    call b:NERDTreeRoot.open()
+
+    "throwaway buffer options
+    setlocal noswapfile
+    setlocal buftype=nofile
+    setlocal bufhidden=hide
+    setlocal nowrap
+    setlocal foldcolumn=0
+    setlocal nobuflisted
+    setlocal nospell
+    if g:NERDTreeShowLineNumbers
+        setlocal nu
+    else
+        setlocal nonu
+    endif
+
+    iabc <buffer>
+
+    if g:NERDTreeHighlightCursorline
+        setlocal cursorline
+    endif
+
+    call s:setupStatusline()
+
+    let b:treeShowHelp = 0
+    let b:NERDTreeIgnoreEnabled = 1
+    let b:NERDTreeShowFiles = g:NERDTreeShowFiles
+    let b:NERDTreeShowHidden = g:NERDTreeShowHidden
+    let b:NERDTreeShowBookmarks = g:NERDTreeShowBookmarks
+
+    let b:NERDTreeType = "secondary"
+
+    call s:bindMappings()
+    setfiletype nerdtree
+    " syntax highlighting
+    if has("syntax") && exists("g:syntax_on")
+        call s:setupSyntaxHighlighting()
+    endif
+
+    call s:renderView()
+endfunction
+" FUNCTION: s:initNerdTreeMirror() {{{2
+function! s:initNerdTreeMirror()
+
+    "get the names off all the nerd tree buffers
+    let treeBufNames = []
+    for i in range(1, tabpagenr("$"))
+        let nextName = s:tabpagevar(i, 'NERDTreeBufName')
+        if nextName != -1 && (!exists("t:NERDTreeBufName") || nextName != t:NERDTreeBufName)
+            call add(treeBufNames, nextName)
+        endif
+    endfor
+    let treeBufNames = s:unique(treeBufNames)
+
+    "map the option names (that the user will be prompted with) to the nerd
+    "tree buffer names
+    let options = {}
+    let i = 0
+    while i < len(treeBufNames)
+        let bufName = treeBufNames[i]
+        let treeRoot = getbufvar(bufName, "NERDTreeRoot")
+        let options[i+1 . '. ' . treeRoot.path.str() . '  (buf name: ' . bufName . ')'] = bufName
+        let i = i + 1
+    endwhile
+
+    "work out which tree to mirror, if there is more than 1 then ask the user
+    let bufferName = ''
+    if len(keys(options)) > 1
+        let choices = ["Choose a tree to mirror"]
+        let choices = extend(choices, sort(keys(options)))
+        let choice = inputlist(choices)
+        if choice < 1 || choice > len(options) || choice ==# ''
+            return
+        endif
+
+        let bufferName = options[sort(keys(options))[choice-1]]
+    elseif len(keys(options)) ==# 1
+        let bufferName = values(options)[0]
+    else
+        call s:echo("No trees to mirror")
+        return
+    endif
+
+    if s:treeExistsForTab() && s:isTreeOpen()
+        call s:closeTree()
+    endif
+
+    let t:NERDTreeBufName = bufferName
+    call s:createTreeWin()
+    exec 'buffer ' .  bufferName
+    if !&hidden
+        call s:renderView()
+    endif
+endfunction
+" FUNCTION: s:nextBufferName() {{{2
+" returns the buffer name for the next nerd tree
+function! s:nextBufferName()
+    let name = s:NERDTreeBufName . s:next_buffer_number
+    let s:next_buffer_number += 1
+    return name
+endfunction
+" FUNCTION: s:tabpagevar(tabnr, var) {{{2
+function! s:tabpagevar(tabnr, var)
+    let currentTab = tabpagenr()
+    let old_ei = &ei
+    set ei=all
+
+    exec "tabnext " . a:tabnr
+    let v = -1
+    if exists('t:' . a:var)
+        exec 'let v = t:' . a:var
+    endif
+    exec "tabnext " . currentTab
+
+    let &ei = old_ei
+
+    return v
+endfunction
+" Function: s:treeExistsForBuffer()   {{{2
+" Returns 1 if a nerd tree root exists in the current buffer
+function! s:treeExistsForBuf()
+    return exists("b:NERDTreeRoot")
+endfunction
+" Function: s:treeExistsForTab()   {{{2
+" Returns 1 if a nerd tree root exists in the current tab
+function! s:treeExistsForTab()
+    return exists("t:NERDTreeBufName")
+endfunction
+" Function: s:unique(list)   {{{2
+" returns a:list without duplicates
+function! s:unique(list)
+  let uniqlist = []
+  for elem in a:list
+    if index(uniqlist, elem) ==# -1
+      let uniqlist += [elem]
+    endif
+  endfor
+  return uniqlist
+endfunction
+" SECTION: Public API {{{1
+"============================================================
+let g:NERDTreePath = s:Path
+let g:NERDTreeDirNode = s:TreeDirNode
+let g:NERDTreeFileNode = s:TreeFileNode
+let g:NERDTreeBookmark = s:Bookmark
+
+function! NERDTreeAddMenuItem(options)
+    call s:MenuItem.Create(a:options)
+endfunction
+
+function! NERDTreeAddMenuSeparator(...)
+    let opts = a:0 ? a:1 : {}
+    call s:MenuItem.CreateSeparator(opts)
+endfunction
+
+function! NERDTreeAddSubmenu(options)
+    return s:MenuItem.Create(a:options)
+endfunction
+
+function! NERDTreeAddKeyMap(options)
+    call s:KeyMap.Create(a:options)
+endfunction
+
+function! NERDTreeRender()
+    call s:renderView()
+endfunction
+
+" SECTION: View Functions {{{1
+"============================================================
+"FUNCTION: s:centerView() {{{2
+"centers the nerd tree window around the cursor (provided the nerd tree
+"options permit)
+function! s:centerView()
+    if g:NERDTreeAutoCenter
+        let current_line = winline()
+        let lines_to_top = current_line
+        let lines_to_bottom = winheight(s:getTreeWinNum()) - current_line
+        if lines_to_top < g:NERDTreeAutoCenterThreshold || lines_to_bottom < g:NERDTreeAutoCenterThreshold
+            normal! zz
+        endif
+    endif
+endfunction
+"FUNCTION: s:closeTree() {{{2
+"Closes the primary NERD tree window for this tab
+function! s:closeTree()
+    if !s:isTreeOpen()
+        throw "NERDTree.NoTreeFoundError: no NERDTree is open"
+    endif
+
+    if winnr("$") != 1
+        call s:exec(s:getTreeWinNum() . " wincmd w")
+        close
+        call s:exec("wincmd p")
+    else
+        close
+    endif
+endfunction
+
+"FUNCTION: s:closeTreeIfOpen() {{{2
+"Closes the NERD tree window if it is open
+function! s:closeTreeIfOpen()
+   if s:isTreeOpen()
+      call s:closeTree()
+   endif
+endfunction
+"FUNCTION: s:closeTreeIfQuitOnOpen() {{{2
+"Closes the NERD tree window if the close on open option is set
+function! s:closeTreeIfQuitOnOpen()
+    if g:NERDTreeQuitOnOpen && s:isTreeOpen()
+        call s:closeTree()
+    endif
+endfunction
+"FUNCTION: s:createTreeWin() {{{2
+"Inits the NERD tree window. ie. opens it, sizes it, sets all the local
+"options etc
+function! s:createTreeWin()
+    "create the nerd tree window
+    let splitLocation = g:NERDTreeWinPos ==# "left" ? "topleft " : "botright "
+    let splitSize = g:NERDTreeWinSize
+
+    if !exists('t:NERDTreeBufName')
+        let t:NERDTreeBufName = s:nextBufferName()
+        silent! exec splitLocation . 'vertical ' . splitSize . ' new'
+        silent! exec "edit " . t:NERDTreeBufName
+    else
+        silent! exec splitLocation . 'vertical ' . splitSize . ' split'
+        silent! exec "buffer " . t:NERDTreeBufName
+    endif
+
+    setlocal winfixwidth
+
+    "throwaway buffer options
+    setlocal noswapfile
+    setlocal buftype=nofile
+    setlocal nowrap
+    setlocal foldcolumn=0
+    setlocal nobuflisted
+    setlocal nospell
+    if g:NERDTreeShowLineNumbers
+        setlocal nu
+    else
+        setlocal nonu
+    endif
+
+    iabc <buffer>
+
+    if g:NERDTreeHighlightCursorline
+        setlocal cursorline
+    endif
+
+    call s:setupStatusline()
+
+    call s:bindMappings()
+    setfiletype nerdtree
+    " syntax highlighting
+    if has("syntax") && exists("g:syntax_on")
+        call s:setupSyntaxHighlighting()
+    endif
+endfunction
+
+"FUNCTION: s:dumpHelp  {{{2
+"prints out the quick help
+function! s:dumpHelp()
+    let old_h = @h
+    if b:treeShowHelp ==# 1
+        let @h=   "\" NERD tree (" . s:NERD_tree_version . ") quickhelp~\n"
+        let @h=@h."\" ============================\n"
+        let @h=@h."\" File node mappings~\n"
+        let @h=@h."\" ". (g:NERDTreeMouseMode ==# 3 ? "single" : "double") ."-click,\n"
+        let @h=@h."\" <CR>,\n"
+        if b:NERDTreeType ==# "primary"
+            let @h=@h."\" ". g:NERDTreeMapActivateNode .": open in prev window\n"
+        else
+            let @h=@h."\" ". g:NERDTreeMapActivateNode .": open in current window\n"
+        endif
+        if b:NERDTreeType ==# "primary"
+            let @h=@h."\" ". g:NERDTreeMapPreview .": preview\n"
+        endif
+        let @h=@h."\" ". g:NERDTreeMapOpenInTab.": open in new tab\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenInTabSilent .": open in new tab silently\n"
+        let @h=@h."\" middle-click,\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenSplit .": open split\n"
+        let @h=@h."\" ". g:NERDTreeMapPreviewSplit .": preview split\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenVSplit .": open vsplit\n"
+        let @h=@h."\" ". g:NERDTreeMapPreviewVSplit .": preview vsplit\n"
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Directory node mappings~\n"
+        let @h=@h."\" ". (g:NERDTreeMouseMode ==# 1 ? "double" : "single") ."-click,\n"
+        let @h=@h."\" ". g:NERDTreeMapActivateNode .": open & close node\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenRecursively .": recursively open node\n"
+        let @h=@h."\" ". g:NERDTreeMapCloseDir .": close parent of node\n"
+        let @h=@h."\" ". g:NERDTreeMapCloseChildren .": close all child nodes of\n"
+        let @h=@h."\"    current node recursively\n"
+        let @h=@h."\" middle-click,\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenExpl.": explore selected dir\n"
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Bookmark table mappings~\n"
+        let @h=@h."\" double-click,\n"
+        let @h=@h."\" ". g:NERDTreeMapActivateNode .": open bookmark\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenInTab.": open in new tab\n"
+        let @h=@h."\" ". g:NERDTreeMapOpenInTabSilent .": open in new tab silently\n"
+        let @h=@h."\" ". g:NERDTreeMapDeleteBookmark .": delete bookmark\n"
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Tree navigation mappings~\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpRoot .": go to root\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpParent .": go to parent\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpFirstChild  .": go to first child\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpLastChild   .": go to last child\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpNextSibling .": go to next sibling\n"
+        let @h=@h."\" ". g:NERDTreeMapJumpPrevSibling .": go to prev sibling\n"
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Filesystem mappings~\n"
+        let @h=@h."\" ". g:NERDTreeMapChangeRoot .": change tree root to the\n"
+        let @h=@h."\"    selected dir\n"
+        let @h=@h."\" ". g:NERDTreeMapUpdir .": move tree root up a dir\n"
+        let @h=@h."\" ". g:NERDTreeMapUpdirKeepOpen .": move tree root up a dir\n"
+        let @h=@h."\"    but leave old root open\n"
+        let @h=@h."\" ". g:NERDTreeMapRefresh .": refresh cursor dir\n"
+        let @h=@h."\" ". g:NERDTreeMapRefreshRoot .": refresh current root\n"
+        let @h=@h."\" ". g:NERDTreeMapMenu .": Show menu\n"
+        let @h=@h."\" ". g:NERDTreeMapChdir .":change the CWD to the\n"
+        let @h=@h."\"    selected dir\n"
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Tree filtering mappings~\n"
+        let @h=@h."\" ". g:NERDTreeMapToggleHidden .": hidden files (" . (b:NERDTreeShowHidden ? "on" : "off") . ")\n"
+        let @h=@h."\" ". g:NERDTreeMapToggleFilters .": file filters (" . (b:NERDTreeIgnoreEnabled ? "on" : "off") . ")\n"
+        let @h=@h."\" ". g:NERDTreeMapToggleFiles .": files (" . (b:NERDTreeShowFiles ? "on" : "off") . ")\n"
+        let @h=@h."\" ". g:NERDTreeMapToggleBookmarks .": bookmarks (" . (b:NERDTreeShowBookmarks ? "on" : "off") . ")\n"
+
+        "add quickhelp entries for each custom key map
+        if len(s:KeyMap.All())
+            let @h=@h."\"\n\" ----------------------------\n"
+            let @h=@h."\" Custom mappings~\n"
+            for i in s:KeyMap.All()
+                let @h=@h."\" ". i.key .": ". i.quickhelpText ."\n"
+            endfor
+        endif
+
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Other mappings~\n"
+        let @h=@h."\" ". g:NERDTreeMapQuit .": Close the NERDTree window\n"
+        let @h=@h."\" ". g:NERDTreeMapToggleZoom .": Zoom (maximize-minimize)\n"
+        let @h=@h."\"    the NERDTree window\n"
+        let @h=@h."\" ". g:NERDTreeMapHelp .": toggle help\n"
+        let @h=@h."\"\n\" ----------------------------\n"
+        let @h=@h."\" Bookmark commands~\n"
+        let @h=@h."\" :Bookmark <name>\n"
+        let @h=@h."\" :BookmarkToRoot <name>\n"
+        let @h=@h."\" :RevealBookmark <name>\n"
+        let @h=@h."\" :OpenBookmark <name>\n"
+        let @h=@h."\" :ClearBookmarks [<names>]\n"
+        let @h=@h."\" :ClearAllBookmarks\n"
+    else
+        let @h="\" Press ". g:NERDTreeMapHelp ." for help\n"
+    endif
+
+    silent! put h
+
+    let @h = old_h
+endfunction
+"FUNCTION: s:echo  {{{2
+"A wrapper for :echo. Appends 'NERDTree:' on the front of all messages
+"
+"Args:
+"msg: the message to echo
+function! s:echo(msg)
+    redraw
+    echomsg "NERDTree: " . a:msg
+endfunction
+"FUNCTION: s:echoWarning {{{2
+"Wrapper for s:echo, sets the message type to warningmsg for this message
+"Args:
+"msg: the message to echo
+function! s:echoWarning(msg)
+    echohl warningmsg
+    call s:echo(a:msg)
+    echohl normal
+endfunction
+"FUNCTION: s:echoError {{{2
+"Wrapper for s:echo, sets the message type to errormsg for this message
+"Args:
+"msg: the message to echo
+function! s:echoError(msg)
+    echohl errormsg
+    call s:echo(a:msg)
+    echohl normal
+endfunction
+"FUNCTION: s:firstUsableWindow(){{{2
+"find the window number of the first normal window
+function! s:firstUsableWindow()
+    let i = 1
+    while i <= winnr("$")
+        let bnum = winbufnr(i)
+        if bnum != -1 && getbufvar(bnum, '&buftype') ==# ''
+                    \ && !getwinvar(i, '&previewwindow')
+                    \ && (!getbufvar(bnum, '&modified') || &hidden)
+            return i
+        endif
+
+        let i += 1
+    endwhile
+    return -1
+endfunction
+"FUNCTION: s:getPath(ln) {{{2
+"Gets the full path to the node that is rendered on the given line number
+"
+"Args:
+"ln: the line number to get the path for
+"
+"Return:
+"A path if a node was selected, {} if nothing is selected.
+"If the 'up a dir' line was selected then the path to the parent of the
+"current root is returned
+function! s:getPath(ln)
+    let line = getline(a:ln)
+
+    let rootLine = s:TreeFileNode.GetRootLineNum()
+
+    "check to see if we have the root node
+    if a:ln == rootLine
+        return b:NERDTreeRoot.path
+    endif
+
+    " in case called from outside the tree
+    if line !~ '^ *[|`]' || line =~ '^$'
+        return {}
+    endif
+
+    if line ==# s:tree_up_dir_line
+        return b:NERDTreeRoot.path.getParent()
+    endif
+
+    let indent = s:indentLevelFor(line)
+
+    "remove the tree parts and the leading space
+    let curFile = s:stripMarkupFromLine(line, 0)
+
+    let wasdir = 0
+    if curFile =~ '/$'
+        let wasdir = 1
+        let curFile = substitute(curFile, '/\?$', '/', "")
+    endif
+
+    let dir = ""
+    let lnum = a:ln
+    while lnum > 0
+        let lnum = lnum - 1
+        let curLine = getline(lnum)
+        let curLineStripped = s:stripMarkupFromLine(curLine, 1)
+
+        "have we reached the top of the tree?
+        if lnum == rootLine
+            let dir = b:NERDTreeRoot.path.str({'format': 'UI'}) . dir
+            break
+        endif
+        if curLineStripped =~ '/$'
+            let lpindent = s:indentLevelFor(curLine)
+            if lpindent < indent
+                let indent = indent - 1
+
+                let dir = substitute (curLineStripped,'^\\', "", "") . dir
+                continue
+            endif
+        endif
+    endwhile
+    let curFile = b:NERDTreeRoot.path.drive . dir . curFile
+    let toReturn = s:Path.New(curFile)
+    return toReturn
+endfunction
+
+"FUNCTION: s:getTreeWinNum() {{{2
+"gets the nerd tree window number for this tab
+function! s:getTreeWinNum()
+    if exists("t:NERDTreeBufName")
+        return bufwinnr(t:NERDTreeBufName)
+    else
+        return -1
+    endif
+endfunction
+"FUNCTION: s:indentLevelFor(line) {{{2
+function! s:indentLevelFor(line)
+    return match(a:line, '[^ \-+~`|]') / s:tree_wid
+endfunction
+"FUNCTION: s:isTreeOpen() {{{2
+function! s:isTreeOpen()
+    return s:getTreeWinNum() != -1
+endfunction
+"FUNCTION: s:isWindowUsable(winnumber) {{{2
+"Returns 0 if opening a file from the tree in the given window requires it to
+"be split, 1 otherwise
+"
+"Args:
+"winnumber: the number of the window in question
+function! s:isWindowUsable(winnumber)
+    "gotta split if theres only one window (i.e. the NERD tree)
+    if winnr("$") ==# 1
+        return 0
+    endif
+
+    let oldwinnr = winnr()
+    call s:exec(a:winnumber . "wincmd p")
+    let specialWindow = getbufvar("%", '&buftype') != '' || getwinvar('%', '&previewwindow')
+    let modified = &modified
+    call s:exec(oldwinnr . "wincmd p")
+
+    "if its a special window e.g. quickfix or another explorer plugin then we
+    "have to split
+    if specialWindow
+        return 0
+    endif
+
+    if &hidden
+        return 1
+    endif
+
+    return !modified || s:bufInWindows(winbufnr(a:winnumber)) >= 2
+endfunction
+
+" FUNCTION: s:jumpToChild(direction) {{{2
+" Args:
+" direction: 0 if going to first child, 1 if going to last
+function! s:jumpToChild(direction)
+    let currentNode = s:TreeFileNode.GetSelected()
+    if currentNode ==# {} || currentNode.isRoot()
+        call s:echo("cannot jump to " . (a:direction ? "last" : "first") .  " child")
+        return
+    end
+    let dirNode = currentNode.parent
+    let childNodes = dirNode.getVisibleChildren()
+
+    let targetNode = childNodes[0]
+    if a:direction
+        let targetNode = childNodes[len(childNodes) - 1]
+    endif
+
+    if targetNode.equals(currentNode)
+        let siblingDir = currentNode.parent.findOpenDirSiblingWithVisibleChildren(a:direction)
+        if siblingDir != {}
+            let indx = a:direction ? siblingDir.getVisibleChildCount()-1 : 0
+            let targetNode = siblingDir.getChildByIndex(indx, 1)
+        endif
+    endif
+
+    call targetNode.putCursorHere(1, 0)
+
+    call s:centerView()
+endfunction
+
+
+"FUNCTION: s:promptToDelBuffer(bufnum, msg){{{2
+"prints out the given msg and, if the user responds by pushing 'y' then the
+"buffer with the given bufnum is deleted
+"
+"Args:
+"bufnum: the buffer that may be deleted
+"msg: a message that will be echoed to the user asking them if they wish to
+"     del the buffer
+function! s:promptToDelBuffer(bufnum, msg)
+    echo a:msg
+    if nr2char(getchar()) ==# 'y'
+        exec "silent bdelete! " . a:bufnum
+    endif
+endfunction
+
+"FUNCTION: s:putCursorOnBookmarkTable(){{{2
+"Places the cursor at the top of the bookmarks table
+function! s:putCursorOnBookmarkTable()
+    if !b:NERDTreeShowBookmarks
+        throw "NERDTree.IllegalOperationError: cant find bookmark table, bookmarks arent active"
+    endif
+
+    let rootNodeLine = s:TreeFileNode.GetRootLineNum()
+
+    let line = 1
+    while getline(line) !~ '^>-\+Bookmarks-\+$'
+        let line = line + 1
+        if line >= rootNodeLine
+            throw "NERDTree.BookmarkTableNotFoundError: didnt find the bookmarks table"
+        endif
+    endwhile
+    call cursor(line, 0)
+endfunction
+
+"FUNCTION: s:putCursorInTreeWin(){{{2
+"Places the cursor in the nerd tree window
+function! s:putCursorInTreeWin()
+    if !s:isTreeOpen()
+        throw "NERDTree.InvalidOperationError: cant put cursor in NERD tree window, no window exists"
+    endif
+
+    call s:exec(s:getTreeWinNum() . "wincmd w")
+endfunction
+
+"FUNCTION: s:renderBookmarks {{{2
+function! s:renderBookmarks()
+
+    call setline(line(".")+1, ">----------Bookmarks----------")
+    call cursor(line(".")+1, col("."))
+
+    for i in s:Bookmark.Bookmarks()
+        call setline(line(".")+1, i.str())
+        call cursor(line(".")+1, col("."))
+    endfor
+
+    call setline(line(".")+1, '')
+    call cursor(line(".")+1, col("."))
+endfunction
+"FUNCTION: s:renderView {{{2
+"The entry function for rendering the tree
+function! s:renderView()
+    setlocal modifiable
+
+    "remember the top line of the buffer and the current line so we can
+    "restore the view exactly how it was
+    let curLine = line(".")
+    let curCol = col(".")
+    let topLine = line("w0")
+
+    "delete all lines in the buffer (being careful not to clobber a register)
+    silent 1,$delete _
+
+    call s:dumpHelp()
+
+    "delete the blank line before the help and add one after it
+    call setline(line(".")+1, "")
+    call cursor(line(".")+1, col("."))
+
+    if b:NERDTreeShowBookmarks
+        call s:renderBookmarks()
+    endif
+
+    "add the 'up a dir' line
+    call setline(line(".")+1, s:tree_up_dir_line)
+    call cursor(line(".")+1, col("."))
+
+    "draw the header line
+    let header = b:NERDTreeRoot.path.str({'format': 'UI', 'truncateTo': winwidth(0)})
+    call setline(line(".")+1, header)
+    call cursor(line(".")+1, col("."))
+
+    "draw the tree
+    let old_o = @o
+    let @o = b:NERDTreeRoot.renderToString()
+    silent put o
+    let @o = old_o
+
+    "delete the blank line at the top of the buffer
+    silent 1,1delete _
+
+    "restore the view
+    let old_scrolloff=&scrolloff
+    let &scrolloff=0
+    call cursor(topLine, 1)
+    normal! zt
+    call cursor(curLine, curCol)
+    let &scrolloff = old_scrolloff
+
+    setlocal nomodifiable
+endfunction
+
+"FUNCTION: s:renderViewSavingPosition {{{2
+"Renders the tree and ensures the cursor stays on the current node or the
+"current nodes parent if it is no longer available upon re-rendering
+function! s:renderViewSavingPosition()
+    let currentNode = s:TreeFileNode.GetSelected()
+
+    "go up the tree till we find a node that will be visible or till we run
+    "out of nodes
+    while currentNode != {} && !currentNode.isVisible() && !currentNode.isRoot()
+        let currentNode = currentNode.parent
+    endwhile
+
+    call s:renderView()
+
+    if currentNode != {}
+        call currentNode.putCursorHere(0, 0)
+    endif
+endfunction
+"FUNCTION: s:restoreScreenState() {{{2
+"
+"Sets the screen state back to what it was when s:saveScreenState was last
+"called.
+"
+"Assumes the cursor is in the NERDTree window
+function! s:restoreScreenState()
+    if !exists("b:NERDTreeOldTopLine") || !exists("b:NERDTreeOldPos") || !exists("b:NERDTreeOldWindowSize")
+        return
+    endif
+    exec("silent vertical resize ".b:NERDTreeOldWindowSize)
+
+    let old_scrolloff=&scrolloff
+    let &scrolloff=0
+    call cursor(b:NERDTreeOldTopLine, 0)
+    normal! zt
+    call setpos(".", b:NERDTreeOldPos)
+    let &scrolloff=old_scrolloff
+endfunction
+
+"FUNCTION: s:saveScreenState() {{{2
+"Saves the current cursor position in the current buffer and the window
+"scroll position
+function! s:saveScreenState()
+    let win = winnr()
+    try
+        call s:putCursorInTreeWin()
+        let b:NERDTreeOldPos = getpos(".")
+        let b:NERDTreeOldTopLine = line("w0")
+        let b:NERDTreeOldWindowSize = winwidth("")
+        call s:exec(win . "wincmd w")
+    catch /^NERDTree.InvalidOperationError/
+    endtry
+endfunction
+
+"FUNCTION: s:setupStatusline() {{{2
+function! s:setupStatusline()
+    if g:NERDTreeStatusline != -1
+        let &l:statusline = g:NERDTreeStatusline
+    endif
+endfunction
+"FUNCTION: s:setupSyntaxHighlighting() {{{2
+function! s:setupSyntaxHighlighting()
+    "treeFlags are syntax items that should be invisible, but give clues as to
+    "how things should be highlighted
+    syn match treeFlag #\~#
+    syn match treeFlag #\[RO\]#
+
+    "highlighting for the .. (up dir) line at the top of the tree
+    execute "syn match treeUp #". s:tree_up_dir_line ."#"
+
+    "highlighting for the ~/+ symbols for the directory nodes
+    syn match treeClosable #\~\<#
+    syn match treeClosable #\~\.#
+    syn match treeOpenable #+\<#
+    syn match treeOpenable #+\.#he=e-1
+
+    "highlighting for the tree structural parts
+    syn match treePart #|#
+    syn match treePart #`#
+    syn match treePartFile #[|`]-#hs=s+1 contains=treePart
+
+    "quickhelp syntax elements
+    syn match treeHelpKey #" \{1,2\}[^ ]*:#hs=s+2,he=e-1
+    syn match treeHelpKey #" \{1,2\}[^ ]*,#hs=s+2,he=e-1
+    syn match treeHelpTitle #" .*\~#hs=s+2,he=e-1 contains=treeFlag
+    syn match treeToggleOn #".*(on)#hs=e-2,he=e-1 contains=treeHelpKey
+    syn match treeToggleOff #".*(off)#hs=e-3,he=e-1 contains=treeHelpKey
+    syn match treeHelpCommand #" :.\{-}\>#hs=s+3
+    syn match treeHelp  #^".*# contains=treeHelpKey,treeHelpTitle,treeFlag,treeToggleOff,treeToggleOn,treeHelpCommand
+
+    "highlighting for readonly files
+    syn match treeRO #.*\[RO\]#hs=s+2 contains=treeFlag,treeBookmark,treePart,treePartFile
+
+    "highlighting for sym links
+    syn match treeLink #[^-| `].* -> # contains=treeBookmark,treeOpenable,treeClosable,treeDirSlash
+
+    "highlighing for directory nodes and file nodes
+    syn match treeDirSlash #/#
+    syn match treeDir #[^-| `].*/# contains=treeLink,treeDirSlash,treeOpenable,treeClosable
+    syn match treeExecFile  #[|`]-.*\*\($\| \)# contains=treeLink,treePart,treeRO,treePartFile,treeBookmark
+    syn match treeFile  #|-.*# contains=treeLink,treePart,treeRO,treePartFile,treeBookmark,treeExecFile
+    syn match treeFile  #`-.*# contains=treeLink,treePart,treeRO,treePartFile,treeBookmark,treeExecFile
+    syn match treeCWD #^/.*$#
+
+    "highlighting for bookmarks
+    syn match treeBookmark # {.*}#hs=s+1
+
+    "highlighting for the bookmarks table
+    syn match treeBookmarksLeader #^>#
+    syn match treeBookmarksHeader #^>-\+Bookmarks-\+$# contains=treeBookmarksLeader
+    syn match treeBookmarkName #^>.\{-} #he=e-1 contains=treeBookmarksLeader
+    syn match treeBookmark #^>.*$# contains=treeBookmarksLeader,treeBookmarkName,treeBookmarksHeader
+
+    if g:NERDChristmasTree
+        hi def link treePart Special
+        hi def link treePartFile Type
+        hi def link treeFile Normal
+        hi def link treeExecFile Title
+        hi def link treeDirSlash Identifier
+        hi def link treeClosable Type
+    else
+        hi def link treePart Normal
+        hi def link treePartFile Normal
+        hi def link treeFile Normal
+        hi def link treeClosable Title
+    endif
+
+    hi def link treeBookmarksHeader statement
+    hi def link treeBookmarksLeader ignore
+    hi def link treeBookmarkName Identifier
+    hi def link treeBookmark normal
+
+    hi def link treeHelp String
+    hi def link treeHelpKey Identifier
+    hi def link treeHelpCommand Identifier
+    hi def link treeHelpTitle Macro
+    hi def link treeToggleOn Question
+    hi def link treeToggleOff WarningMsg
+
+    hi def link treeDir Directory
+    hi def link treeUp Directory
+    hi def link treeCWD Statement
+    hi def link treeLink Macro
+    hi def link treeOpenable Title
+    hi def link treeFlag ignore
+    hi def link treeRO WarningMsg
+    hi def link treeBookmark Statement
+
+    hi def link NERDTreeCurrentNode Search
+endfunction
+
+"FUNCTION: s:stripMarkupFromLine(line, removeLeadingSpaces){{{2
+"returns the given line with all the tree parts stripped off
+"
+"Args:
+"line: the subject line
+"removeLeadingSpaces: 1 if leading spaces are to be removed (leading spaces =
+"any spaces before the actual text of the node)
+function! s:stripMarkupFromLine(line, removeLeadingSpaces)
+    let line = a:line
+    "remove the tree parts and the leading space
+    let line = substitute (line, s:tree_markup_reg,"","")
+
+    "strip off any read only flag
+    let line = substitute (line, ' \[RO\]', "","")
+
+    "strip off any bookmark flags
+    let line = substitute (line, ' {[^}]*}', "","")
+
+    "strip off any executable flags
+    let line = substitute (line, '*\ze\($\| \)', "","")
+
+    let wasdir = 0
+    if line =~ '/$'
+        let wasdir = 1
+    endif
+    let line = substitute (line,' -> .*',"","") " remove link to
+    if wasdir ==# 1
+        let line = substitute (line, '/\?$', '/', "")
+    endif
+
+    if a:removeLeadingSpaces
+        let line = substitute (line, '^ *', '', '')
+    endif
+
+    return line
+endfunction
+
+"FUNCTION: s:toggle(dir) {{{2
+"Toggles the NERD tree. I.e the NERD tree is open, it is closed, if it is
+"closed it is restored or initialized (if it doesnt exist)
+"
+"Args:
+"dir: the full path for the root node (is only used if the NERD tree is being
+"initialized.
+function! s:toggle(dir)
+    if s:treeExistsForTab()
+        if !s:isTreeOpen()
+            call s:createTreeWin()
+            if !&hidden
+                call s:renderView()
+            endif
+            call s:restoreScreenState()
+        else
+            call s:closeTree()
+        endif
+    else
+        call s:initNerdTree(a:dir)
+    endif
+endfunction
+"SECTION: Interface bindings {{{1
+"============================================================
+"FUNCTION: s:activateNode(forceKeepWindowOpen) {{{2
+"If the current node is a file, open it in the previous window (or a new one
+"if the previous is modified). If it is a directory then it is opened.
+"
+"args:
+"forceKeepWindowOpen - dont close the window even if NERDTreeQuitOnOpen is set
+function! s:activateNode(forceKeepWindowOpen)
+    if getline(".") ==# s:tree_up_dir_line
+        return s:upDir(0)
+    endif
+
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode != {}
+        call treenode.activate(a:forceKeepWindowOpen)
+    else
+        let bookmark = s:Bookmark.GetSelected()
+        if !empty(bookmark)
+            call bookmark.activate()
+        endif
+    endif
+endfunction
+
+"FUNCTION: s:bindMappings() {{{2
+function! s:bindMappings()
+    " set up mappings and commands for this buffer
+    nnoremap <silent> <buffer> <middlerelease> :call <SID>handleMiddleMouse()<cr>
+    nnoremap <silent> <buffer> <leftrelease> <leftrelease>:call <SID>checkForActivate()<cr>
+    nnoremap <silent> <buffer> <2-leftmouse> :call <SID>activateNode(0)<cr>
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapActivateNode . " :call <SID>activateNode(0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenSplit ." :call <SID>openEntrySplit(0,0)<cr>"
+    exec "nnoremap <silent> <buffer> <cr> :call <SID>activateNode(0)<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapPreview ." :call <SID>previewNode(0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapPreviewSplit ." :call <SID>previewNode(1)<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenVSplit ." :call <SID>openEntrySplit(1,0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapPreviewVSplit ." :call <SID>previewNode(2)<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenRecursively ." :call <SID>openNodeRecursively()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapUpdirKeepOpen ." :call <SID>upDir(1)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapUpdir ." :call <SID>upDir(0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapChangeRoot ." :call <SID>chRoot()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapChdir ." :call <SID>chCwd()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapQuit ." :call <SID>closeTreeWindow()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapRefreshRoot ." :call <SID>refreshRoot()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapRefresh ." :call <SID>refreshCurrent()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapHelp ." :call <SID>displayHelp()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapToggleZoom ." :call <SID>toggleZoom()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapToggleHidden ." :call <SID>toggleShowHidden()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapToggleFilters ." :call <SID>toggleIgnoreFilter()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapToggleFiles ." :call <SID>toggleShowFiles()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapToggleBookmarks ." :call <SID>toggleShowBookmarks()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapCloseDir ." :call <SID>closeCurrentDir()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapCloseChildren ." :call <SID>closeChildren()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapMenu ." :call <SID>showMenu()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpParent ." :call <SID>jumpToParent()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpNextSibling ." :call <SID>jumpToSibling(1)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpPrevSibling ." :call <SID>jumpToSibling(0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpFirstChild ." :call <SID>jumpToFirstChild()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpLastChild ." :call <SID>jumpToLastChild()<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapJumpRoot ." :call <SID>jumpToRoot()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenInTab ." :call <SID>openInNewTab(0)<cr>"
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenInTabSilent ." :call <SID>openInNewTab(1)<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapOpenExpl ." :call <SID>openExplorer()<cr>"
+
+    exec "nnoremap <silent> <buffer> ". g:NERDTreeMapDeleteBookmark ." :call <SID>deleteBookmark()<cr>"
+
+    "bind all the user custom maps
+    call s:KeyMap.BindAll()
+
+    command! -buffer -nargs=1 Bookmark :call <SID>bookmarkNode('<args>')
+    command! -buffer -complete=customlist,s:completeBookmarks -nargs=1 RevealBookmark :call <SID>revealBookmark('<args>')
+    command! -buffer -complete=customlist,s:completeBookmarks -nargs=1 OpenBookmark :call <SID>openBookmark('<args>')
+    command! -buffer -complete=customlist,s:completeBookmarks -nargs=* ClearBookmarks call <SID>clearBookmarks('<args>')
+    command! -buffer -complete=customlist,s:completeBookmarks -nargs=+ BookmarkToRoot call s:Bookmark.ToRoot('<args>')
+    command! -buffer -nargs=0 ClearAllBookmarks call s:Bookmark.ClearAll() <bar> call <SID>renderView()
+    command! -buffer -nargs=0 ReadBookmarks call s:Bookmark.CacheBookmarks(0) <bar> call <SID>renderView()
+    command! -buffer -nargs=0 WriteBookmarks call s:Bookmark.Write()
+endfunction
+
+" FUNCTION: s:bookmarkNode(name) {{{2
+" Associate the current node with the given name
+function! s:bookmarkNode(name)
+    let currentNode = s:TreeFileNode.GetSelected()
+    if currentNode != {}
+        try
+            call currentNode.bookmark(a:name)
+            call s:renderView()
+        catch /^NERDTree.IllegalBookmarkNameError/
+            call s:echo("bookmark names must not contain spaces")
+        endtry
+    else
+        call s:echo("select a node first")
+    endif
+endfunction
+"FUNCTION: s:checkForActivate() {{{2
+"Checks if the click should open the current node, if so then activate() is
+"called (directories are automatically opened if the symbol beside them is
+"clicked)
+function! s:checkForActivate()
+    let currentNode = s:TreeFileNode.GetSelected()
+    if currentNode != {}
+        let startToCur = strpart(getline(line(".")), 0, col("."))
+        let char = strpart(startToCur, strlen(startToCur)-1, 1)
+
+        "if they clicked a dir, check if they clicked on the + or ~ sign
+        "beside it
+        if currentNode.path.isDirectory
+            if startToCur =~ s:tree_markup_reg . '$' && char =~ '[+~]'
+                call s:activateNode(0)
+                return
+            endif
+        endif
+
+        if (g:NERDTreeMouseMode ==# 2 && currentNode.path.isDirectory) || g:NERDTreeMouseMode ==# 3
+            if char !~ s:tree_markup_reg && startToCur !~ '\/$'
+                call s:activateNode(0)
+                return
+            endif
+        endif
+    endif
+endfunction
+
+" FUNCTION: s:chCwd() {{{2
+function! s:chCwd()
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode ==# {}
+        call s:echo("Select a node first")
+        return
+    endif
+
+    try
+        call treenode.path.changeToDir()
+    catch /^NERDTree.PathChangeError/
+        call s:echoWarning("could not change cwd")
+    endtry
+endfunction
+
+" FUNCTION: s:chRoot() {{{2
+" changes the current root to the selected one
+function! s:chRoot()
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode ==# {}
+        call s:echo("Select a node first")
+        return
+    endif
+
+    call treenode.makeRoot()
+    call s:renderView()
+    call b:NERDTreeRoot.putCursorHere(0, 0)
+endfunction
+
+" FUNCTION: s:clearBookmarks(bookmarks) {{{2
+function! s:clearBookmarks(bookmarks)
+    if a:bookmarks ==# ''
+        let currentNode = s:TreeFileNode.GetSelected()
+        if currentNode != {}
+            call currentNode.clearBoomarks()
+        endif
+    else
+        for name in split(a:bookmarks, ' ')
+            let bookmark = s:Bookmark.BookmarkFor(name)
+            call bookmark.delete()
+        endfor
+    endif
+    call s:renderView()
+endfunction
+" FUNCTION: s:closeChildren() {{{2
+" closes all childnodes of the current node
+function! s:closeChildren()
+    let currentNode = s:TreeDirNode.GetSelected()
+    if currentNode ==# {}
+        call s:echo("Select a node first")
+        return
+    endif
+
+    call currentNode.closeChildren()
+    call s:renderView()
+    call currentNode.putCursorHere(0, 0)
+endfunction
+" FUNCTION: s:closeCurrentDir() {{{2
+" closes the parent dir of the current node
+function! s:closeCurrentDir()
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode ==# {}
+        call s:echo("Select a node first")
+        return
+    endif
+
+    let parent = treenode.parent
+    if parent ==# {} || parent.isRoot()
+        call s:echo("cannot close tree root")
+    else
+        call treenode.parent.close()
+        call s:renderView()
+        call treenode.parent.putCursorHere(0, 0)
+    endif
+endfunction
+" FUNCTION: s:closeTreeWindow() {{{2
+" close the tree window
+function! s:closeTreeWindow()
+    if b:NERDTreeType ==# "secondary" && b:NERDTreePreviousBuf != -1
+        exec "buffer " . b:NERDTreePreviousBuf
+    else
+        if winnr("$") > 1
+            call s:closeTree()
+        else
+            call s:echo("Cannot close last window")
+        endif
+    endif
+endfunction
+" FUNCTION: s:deleteBookmark() {{{2
+" if the cursor is on a bookmark, prompt to delete
+function! s:deleteBookmark()
+    let bookmark = s:Bookmark.GetSelected()
+    if bookmark ==# {}
+        call s:echo("Put the cursor on a bookmark")
+        return
+    endif
+
+    echo  "Are you sure you wish to delete the bookmark:\n\"" . bookmark.name . "\" (yN):"
+
+    if  nr2char(getchar()) ==# 'y'
+        try
+            call bookmark.delete()
+            call s:renderView()
+            redraw
+        catch /^NERDTree/
+            call s:echoWarning("Could not remove bookmark")
+        endtry
+    else
+        call s:echo("delete aborted" )
+    endif
+
+endfunction
+
+" FUNCTION: s:displayHelp() {{{2
+" toggles the help display
+function! s:displayHelp()
+    let b:treeShowHelp = b:treeShowHelp ? 0 : 1
+    call s:renderView()
+    call s:centerView()
+endfunction
+
+" FUNCTION: s:handleMiddleMouse() {{{2
+function! s:handleMiddleMouse()
+    let curNode = s:TreeFileNode.GetSelected()
+    if curNode ==# {}
+        call s:echo("Put the cursor on a node first" )
+        return
+    endif
+
+    if curNode.path.isDirectory
+        call s:openExplorer()
+    else
+        call s:openEntrySplit(0,0)
+    endif
+endfunction
+
+
+" FUNCTION: s:jumpToFirstChild() {{{2
+" wrapper for the jump to child method
+function! s:jumpToFirstChild()
+    call s:jumpToChild(0)
+endfunction
+
+" FUNCTION: s:jumpToLastChild() {{{2
+" wrapper for the jump to child method
+function! s:jumpToLastChild()
+    call s:jumpToChild(1)
+endfunction
+
+" FUNCTION: s:jumpToParent() {{{2
+" moves the cursor to the parent of the current node
+function! s:jumpToParent()
+    let currentNode = s:TreeFileNode.GetSelected()
+    if !empty(currentNode)
+        if !empty(currentNode.parent)
+            call currentNode.parent.putCursorHere(1, 0)
+            call s:centerView()
+        else
+            call s:echo("cannot jump to parent")
+        endif
+    else
+        call s:echo("put the cursor on a node first")
+    endif
+endfunction
+
+" FUNCTION: s:jumpToRoot() {{{2
+" moves the cursor to the root node
+function! s:jumpToRoot()
+    call b:NERDTreeRoot.putCursorHere(1, 0)
+    call s:centerView()
+endfunction
+
+" FUNCTION: s:jumpToSibling() {{{2
+" moves the cursor to the sibling of the current node in the given direction
+"
+" Args:
+" forward: 1 if the cursor should move to the next sibling, 0 if it should
+" move back to the previous sibling
+function! s:jumpToSibling(forward)
+    let currentNode = s:TreeFileNode.GetSelected()
+    if !empty(currentNode)
+        let sibling = currentNode.findSibling(a:forward)
+
+        if !empty(sibling)
+            call sibling.putCursorHere(1, 0)
+            call s:centerView()
+        endif
+    else
+        call s:echo("put the cursor on a node first")
+    endif
+endfunction
+
+" FUNCTION: s:openBookmark(name) {{{2
+" put the cursor on the given bookmark and, if its a file, open it
+function! s:openBookmark(name)
+    try
+        let targetNode = s:Bookmark.GetNodeForName(a:name, 0)
+        call targetNode.putCursorHere(0, 1)
+        redraw!
+    catch /^NERDTree.BookmarkedNodeNotFoundError/
+        call s:echo("note - target node is not cached")
+        let bookmark = s:Bookmark.BookmarkFor(a:name)
+        let targetNode = s:TreeFileNode.New(bookmark.path)
+    endtry
+    if targetNode.path.isDirectory
+        call targetNode.openExplorer()
+    else
+        call targetNode.open()
+    endif
+endfunction
+" FUNCTION: s:openEntrySplit(vertical, forceKeepWindowOpen) {{{2
+"Opens the currently selected file from the explorer in a
+"new window
+"
+"args:
+"forceKeepWindowOpen - dont close the window even if NERDTreeQuitOnOpen is set
+function! s:openEntrySplit(vertical, forceKeepWindowOpen)
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode != {}
+        if a:vertical
+            call treenode.openVSplit()
+        else
+            call treenode.openSplit()
+        endif
+        if !a:forceKeepWindowOpen
+            call s:closeTreeIfQuitOnOpen()
+        endif
+    else
+        call s:echo("select a node first")
+    endif
+endfunction
+
+" FUNCTION: s:openExplorer() {{{2
+function! s:openExplorer()
+    let treenode = s:TreeDirNode.GetSelected()
+    if treenode != {}
+        call treenode.openExplorer()
+    else
+        call s:echo("select a node first")
+    endif
+endfunction
+
+" FUNCTION: s:openInNewTab(stayCurrentTab) {{{2
+" Opens the selected node or bookmark in a new tab
+" Args:
+" stayCurrentTab: if 1 then vim will stay in the current tab, if 0 then vim
+" will go to the tab where the new file is opened
+function! s:openInNewTab(stayCurrentTab)
+    let target = s:TreeFileNode.GetSelected()
+    if target == {}
+        let target = s:Bookmark.GetSelected()
+    endif
+
+    if target != {}
+        call target.openInNewTab({'stayInCurrentTab': a:stayCurrentTab})
+    endif
+endfunction
+
+" FUNCTION: s:openNodeRecursively() {{{2
+function! s:openNodeRecursively()
+    let treenode = s:TreeFileNode.GetSelected()
+    if treenode ==# {} || treenode.path.isDirectory ==# 0
+        call s:echo("Select a directory node first" )
+    else
+        call s:echo("Recursively opening node. Please wait...")
+        call treenode.openRecursively()
+        call s:renderView()
+        redraw
+        call s:echo("Recursively opening node. Please wait... DONE")
+    endif
+
+endfunction
+
+"FUNCTION: s:previewNode() {{{2
+"Args:
+"   openNewWin: if 0, use the previous window, if 1 open in new split, if 2
+"               open in a vsplit
+function! s:previewNode(openNewWin)
+    let currentBuf = bufnr("")
+    if a:openNewWin > 0
+        call s:openEntrySplit(a:openNewWin ==# 2,1)
+    else
+        call s:activateNode(1)
+    end
+    call s:exec(bufwinnr(currentBuf) . "wincmd w")
+endfunction
+
+" FUNCTION: s:revealBookmark(name) {{{2
+" put the cursor on the node associate with the given name
+function! s:revealBookmark(name)
+    try
+        let targetNode = s:Bookmark.GetNodeForName(a:name, 0)
+        call targetNode.putCursorHere(0, 1)
+    catch /^NERDTree.BookmarkNotFoundError/
+        call s:echo("Bookmark isnt cached under the current root")
+    endtry
+endfunction
+" FUNCTION: s:refreshRoot() {{{2
+" Reloads the current root. All nodes below this will be lost and the root dir
+" will be reloaded.
+function! s:refreshRoot()
+    call s:echo("Refreshing the root node. This could take a while...")
+    call b:NERDTreeRoot.refresh()
+    call s:renderView()
+    redraw
+    call s:echo("Refreshing the root node. This could take a while... DONE")
+endfunction
+
+" FUNCTION: s:refreshCurrent() {{{2
+" refreshes the root for the current node
+function! s:refreshCurrent()
+    let treenode = s:TreeDirNode.GetSelected()
+    if treenode ==# {}
+        call s:echo("Refresh failed. Select a node first")
+        return
+    endif
+
+    call s:echo("Refreshing node. This could take a while...")
+    call treenode.refresh()
+    call s:renderView()
+    redraw
+    call s:echo("Refreshing node. This could take a while... DONE")
+endfunction
+" FUNCTION: s:showMenu() {{{2
+function! s:showMenu()
+    let curNode = s:TreeFileNode.GetSelected()
+    if curNode ==# {}
+        call s:echo("Put the cursor on a node first" )
+        return
+    endif
+
+    let mc = s:MenuController.New(s:MenuItem.AllEnabled())
+    call mc.showMenu()
+endfunction
+
+" FUNCTION: s:toggleIgnoreFilter() {{{2
+" toggles the use of the NERDTreeIgnore option
+function! s:toggleIgnoreFilter()
+    let b:NERDTreeIgnoreEnabled = !b:NERDTreeIgnoreEnabled
+    call s:renderViewSavingPosition()
+    call s:centerView()
+endfunction
+
+" FUNCTION: s:toggleShowBookmarks() {{{2
+" toggles the display of bookmarks
+function! s:toggleShowBookmarks()
+    let b:NERDTreeShowBookmarks = !b:NERDTreeShowBookmarks
+    if b:NERDTreeShowBookmarks
+        call s:renderView()
+        call s:putCursorOnBookmarkTable()
+    else
+        call s:renderViewSavingPosition()
+    endif
+    call s:centerView()
+endfunction
+" FUNCTION: s:toggleShowFiles() {{{2
+" toggles the display of hidden files
+function! s:toggleShowFiles()
+    let b:NERDTreeShowFiles = !b:NERDTreeShowFiles
+    call s:renderViewSavingPosition()
+    call s:centerView()
+endfunction
+
+" FUNCTION: s:toggleShowHidden() {{{2
+" toggles the display of hidden files
+function! s:toggleShowHidden()
+    let b:NERDTreeShowHidden = !b:NERDTreeShowHidden
+    call s:renderViewSavingPosition()
+    call s:centerView()
+endfunction
+
+" FUNCTION: s:toggleZoom() {{2
+" zoom (maximize/minimize) the NERDTree window
+function! s:toggleZoom()
+    if exists("b:NERDTreeZoomed") && b:NERDTreeZoomed
+        let size = exists("b:NERDTreeOldWindowSize") ? b:NERDTreeOldWindowSize : g:NERDTreeWinSize
+        exec "silent vertical resize ". size
+        let b:NERDTreeZoomed = 0
+    else
+        exec "vertical resize"
+        let b:NERDTreeZoomed = 1
+    endif
+endfunction
+
+"FUNCTION: s:upDir(keepState) {{{2
+"moves the tree up a level
+"
+"Args:
+"keepState: 1 if the current root should be left open when the tree is
+"re-rendered
+function! s:upDir(keepState)
+    let cwd = b:NERDTreeRoot.path.str({'format': 'UI'})
+    if cwd ==# "/" || cwd =~ '^[^/]..$'
+        call s:echo("already at top dir")
+    else
+        if !a:keepState
+            call b:NERDTreeRoot.close()
+        endif
+
+        let oldRoot = b:NERDTreeRoot
+
+        if empty(b:NERDTreeRoot.parent)
+            let path = b:NERDTreeRoot.path.getParent()
+            let newRoot = s:TreeDirNode.New(path)
+            call newRoot.open()
+            call newRoot.transplantChild(b:NERDTreeRoot)
+            let b:NERDTreeRoot = newRoot
+        else
+            let b:NERDTreeRoot = b:NERDTreeRoot.parent
+        endif
+
+        if g:NERDTreeChDirMode ==# 2
+            call b:NERDTreeRoot.path.changeToDir()
+        endif
+
+        call s:renderView()
+        call oldRoot.putCursorHere(0, 0)
+    endif
+endfunction
+
+
+"reset &cpo back to users setting
+let &cpo = s:old_cpo
+
+" vim: set sw=4 sts=4 et fdm=marker: