if exists("g:loaded_nerdtree_autoload")
    finish
endif
let g:loaded_nerdtree_autoload = 1

function! nerdtree#version()
    return '4.2.0'
endfunction

" SECTION: General Functions {{{1
"============================================================
"FUNCTION: nerdtree#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! nerdtree#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: nerdtree#checkForBrowse(dir) {{{2
"inits a secondary nerd tree in the current buffer if appropriate
function! nerdtree#checkForBrowse(dir)
    if a:dir != '' && isdirectory(a:dir)
        call g:NERDTreeCreator.CreateSecondary(a:dir)
    endif
endfunction

" FUNCTION: nerdtree#completeBookmarks(A,L,P) {{{2
" completion function for the bookmark commands
function! nerdtree#completeBookmarks(A,L,P)
    return filter(g:NERDTreeBookmark.BookmarkNames(), 'v:val =~# "^' . a:A . '"')
endfunction

"FUNCTION: nerdtree#compareBookmarks(dir) {{{2
function! nerdtree#compareBookmarks(first, second)
    return a:first.compareTo(a:second)
endfunction

"FUNCTION: nerdtree#compareNodes(dir) {{{2
function! nerdtree#compareNodes(n1, n2)
    return a:n1.path.compareTo(a:n2.path)
endfunction


" FUNCTION: nerdtree#deprecated(func, [msg]) {{{2
" Issue a deprecation warning for a:func. If a second arg is given, use this
" as the deprecation message
function! nerdtree#deprecated(func, ...)
    let msg = a:0 ? a:func . ' ' . a:1 : a:func . ' is deprecated'

    if !exists('s:deprecationWarnings')
        let s:deprecationWarnings = {}
    endif
    if !has_key(s:deprecationWarnings, a:func)
        let s:deprecationWarnings[a:func] = 1
        echomsg msg
    endif
endfunction

"FUNCTION: nerdtree#escChars(dir) {{{2
function! nerdtree#escChars()
    if nerdtree#runningWindows()
        return " `\|\"#%&,?()\*^<>"
    endif

    return " \\`\|\"#%&,?()\*^<>[]"
endfunction

" FUNCTION: nerdtree#exec(cmd) {{{2
" same as :exec cmd  but eventignore=all is set for the duration
function! nerdtree#exec(cmd)
    let old_ei = &ei
    set ei=all
    exec a:cmd
    let &ei = old_ei
endfunction

" FUNCTION: nerdtree#findAndRevealPath() {{{2
function! nerdtree#findAndRevealPath()
    try
        let p = g:NERDTreePath.New(expand("%:p"))
    catch /^NERDTree.InvalidArgumentsError/
        call nerdtree#echo("no file for the current buffer")
        return
    endtry

    if p.isUnixHiddenPath()
        let showhidden=g:NERDTreeShowHidden
        let g:NERDTreeShowHidden = 1
    endif

    if !nerdtree#treeExistsForTab()
        try
            let cwd = g:NERDTreePath.New(getcwd())
        catch /^NERDTree.InvalidArgumentsError/
            call nerdtree#echo("current directory does not exist.")
            let cwd = p.getParent()
        endtry

        if p.isUnder(cwd)
            call g:NERDTreeCreator.CreatePrimary(cwd.str())
        else
            call g:NERDTreeCreator.CreatePrimary(p.getParent().str())
        endif
    else
        if !p.isUnder(g:NERDTreeFileNode.GetRootForTab().path)
            if !nerdtree#isTreeOpen()
                call g:NERDTreeCreator.TogglePrimary('')
            else
                call nerdtree#putCursorInTreeWin()
            endif
            let b:NERDTreeShowHidden = g:NERDTreeShowHidden
            call nerdtree#chRoot(g:NERDTreeDirNode.New(p.getParent()))
        else
            if !nerdtree#isTreeOpen()
                call g:NERDTreeCreator.TogglePrimary("")
            endif
        endif
    endif
    call nerdtree#putCursorInTreeWin()
    call b:NERDTreeRoot.reveal(p)

    if p.isUnixHiddenFile()
        let g:NERDTreeShowHidden = showhidden
    endif
endfunction

" FUNCTION: nerdtree#has_opt(options, name) {{{2
function! nerdtree#has_opt(options, name)
    return has_key(a:options, a:name) && a:options[a:name] == 1
endfunction

" FUNCTION: nerdtree#invokeKeyMap(key) {{{2
"this is needed since I cant figure out how to invoke dict functions from a
"key map
function! nerdtree#invokeKeyMap(key)
    call g:NERDTreeKeyMap.Invoke(a:key)
endfunction

" FUNCTION: nerdtree#loadClassFiles() {{{2
function! nerdtree#loadClassFiles()
    runtime lib/nerdtree/path.vim
    runtime lib/nerdtree/menu_controller.vim
    runtime lib/nerdtree/menu_item.vim
    runtime lib/nerdtree/key_map.vim
    runtime lib/nerdtree/bookmark.vim
    runtime lib/nerdtree/tree_file_node.vim
    runtime lib/nerdtree/tree_dir_node.vim
    runtime lib/nerdtree/opener.vim
    runtime lib/nerdtree/creator.vim
endfunction

" FUNCTION: nerdtree#postSourceActions() {{{2
function! nerdtree#postSourceActions()
    call g:NERDTreeBookmark.CacheBookmarks(0)
    call nerdtree#ui_glue#createDefaultBindings()

    "load all nerdtree plugins
    runtime! nerdtree_plugin/**/*.vim
endfunction

"FUNCTION: nerdtree#runningWindows(dir) {{{2
function! nerdtree#runningWindows()
    return has("win16") || has("win32") || has("win64")
endfunction

" FUNCTION: nerdtree#tabpagevar(tabnr, var) {{{2
function! nerdtree#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: nerdtree#treeExistsForBuffer()   {{{2
" Returns 1 if a nerd tree root exists in the current buffer
function! nerdtree#treeExistsForBuf()
    return exists("b:NERDTreeRoot")
endfunction

" Function: nerdtree#treeExistsForTab()   {{{2
" Returns 1 if a nerd tree root exists in the current tab
function! nerdtree#treeExistsForTab()
    return exists("t:NERDTreeBufName")
endfunction

"FUNCTION: nerdtree#treeMarkupReg(dir) {{{2
function! nerdtree#treeMarkupReg()
    if g:NERDTreeDirArrows
        return '^\([▾▸] \| \+[▾▸] \| \+\)'
    endif

    return '^[ `|]*[\-+~]'
endfunction

"FUNCTION: nerdtree#treeUpDirLine(dir) {{{2
function! nerdtree#treeUpDirLine()
    return '.. (up a dir)'
endfunction

"FUNCTION: nerdtree#treeWid(dir) {{{2
function! nerdtree#treeWid()
    return 2
endfunction

"FUNCTION: nerdtree#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! nerdtree#upDir(keepState)
    let cwd = b:NERDTreeRoot.path.str({'format': 'UI'})
    if cwd ==# "/" || cwd =~# '^[^/]..$'
        call nerdtree#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 = g:NERDTreeDirNode.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 nerdtree#renderView()
        call oldRoot.putCursorHere(0, 0)
    endif
endfunction

" Function: nerdtree#unique(list)   {{{2
" returns a:list without duplicates
function! nerdtree#unique(list)
  let uniqlist = []
  for elem in a:list
    if index(uniqlist, elem) ==# -1
      let uniqlist += [elem]
    endif
  endfor
  return uniqlist
endfunction

" SECTION: View Functions {{{1
"============================================================
"
"FUNCTION: nerdtree#centerView() {{{2
"centers the nerd tree window around the cursor (provided the nerd tree
"options permit)
function! nerdtree#centerView()
    if g:NERDTreeAutoCenter
        let current_line = winline()
        let lines_to_top = current_line
        let lines_to_bottom = winheight(nerdtree#getTreeWinNum()) - current_line
        if lines_to_top < g:NERDTreeAutoCenterThreshold || lines_to_bottom < g:NERDTreeAutoCenterThreshold
            normal! zz
        endif
    endif
endfunction

" FUNCTION: nerdtree#chRoot(node) {{{2
" changes the current root to the selected one
function! nerdtree#chRoot(node)
    call s:chRoot(a:node)
endfunction
"FUNCTION: nerdtree#closeTree() {{{2
"Closes the primary NERD tree window for this tab
function! nerdtree#closeTree()
    if !nerdtree#isTreeOpen()
        throw "NERDTree.NoTreeFoundError: no NERDTree is open"
    endif

    if winnr("$") != 1
        if winnr() == nerdtree#getTreeWinNum()
            call nerdtree#exec("wincmd p")
            let bufnr = bufnr("")
            call nerdtree#exec("wincmd p")
        else
            let bufnr = bufnr("")
        endif

        call nerdtree#exec(nerdtree#getTreeWinNum() . " wincmd w")
        close
        call nerdtree#exec(bufwinnr(bufnr) . " wincmd w")
    else
        close
    endif
endfunction

"FUNCTION: nerdtree#closeTreeIfOpen() {{{2
"Closes the NERD tree window if it is open
function! nerdtree#closeTreeIfOpen()
   if nerdtree#isTreeOpen()
      call nerdtree#closeTree()
   endif
endfunction

"FUNCTION: nerdtree#closeTreeIfQuitOnOpen() {{{2
"Closes the NERD tree window if the close on open option is set
function! nerdtree#closeTreeIfQuitOnOpen()
    if g:NERDTreeQuitOnOpen && nerdtree#isTreeOpen()
        call nerdtree#closeTree()
    endif
endfunction

"FUNCTION: nerdtree#dumpHelp  {{{2
"prints out the quick help
function! nerdtree#dumpHelp()
    let old_h = @h
    if b:treeShowHelp ==# 1
        let @h=   "\" NERD tree (" . nerdtree#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."\" ". g:NERDTreeMapCWD .":change tree root to CWD\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
        let @h=@h."\"\n\" ----------------------------\n"
        let @h=@h."\" Custom mappings~\n"
        for i in g:NERDTreeKeyMap.All()
            if !empty(i.quickhelpText)
                let @h=@h."\" ". i.key .": ". i.quickhelpText ."\n"
            endif
        endfor

        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"
        silent! put h
    elseif g:NERDTreeMinimalUI == 0
        let @h="\" Press ". g:NERDTreeMapHelp ." for help\n"
        silent! put h
    endif

    let @h = old_h
endfunction

"FUNCTION: nerdtree#echo  {{{2
"A wrapper for :echo. Appends 'NERDTree:' on the front of all messages
"
"Args:
"msg: the message to echo
function! nerdtree#echo(msg)
    redraw
    echomsg "NERDTree: " . a:msg
endfunction

"FUNCTION: nerdtree#echoError {{{2
"Wrapper for nerdtree#echo, sets the message type to errormsg for this message
"Args:
"msg: the message to echo
function! nerdtree#echoError(msg)
    echohl errormsg
    call nerdtree#echo(a:msg)
    echohl normal
endfunction

"FUNCTION: nerdtree#echoWarning {{{2
"Wrapper for nerdtree#echo, sets the message type to warningmsg for this message
"Args:
"msg: the message to echo
function! nerdtree#echoWarning(msg)
    echohl warningmsg
    call nerdtree#echo(a:msg)
    echohl normal
endfunction

"FUNCTION: nerdtree#firstUsableWindow(){{{2
"find the window number of the first normal window
function! nerdtree#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: nerdtree#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! nerdtree#getPath(ln)
    let line = getline(a:ln)

    let rootLine = g:NERDTreeFileNode.GetRootLineNum()

    "check to see if we have the root node
    if a:ln == rootLine
        return b:NERDTreeRoot.path
    endif

    if !g:NERDTreeDirArrows
        " in case called from outside the tree
        if line !~# '^ *[|`▸▾ ]' || line =~# '^$'
            return {}
        endif
    endif

    if line ==# nerdtree#treeUpDirLine()
        return b:NERDTreeRoot.path.getParent()
    endif

    let indent = nerdtree#indentLevelFor(line)

    "remove the tree parts and the leading space
    let curFile = nerdtree#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 = nerdtree#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 = nerdtree#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 = g:NERDTreePath.New(curFile)
    return toReturn
endfunction

"FUNCTION: nerdtree#getTreeWinNum() {{{2
"gets the nerd tree window number for this tab
function! nerdtree#getTreeWinNum()
    if exists("t:NERDTreeBufName")
        return bufwinnr(t:NERDTreeBufName)
    else
        return -1
    endif
endfunction

"FUNCTION: nerdtree#indentLevelFor(line) {{{2
function! nerdtree#indentLevelFor(line)
    let level = match(a:line, '[^ \-+~▸▾`|]') / nerdtree#treeWid()
    " check if line includes arrows
    if match(a:line, '[▸▾]') > -1
        " decrement level as arrow uses 3 ascii chars
        let level = level - 1
    endif
    return level
endfunction

"FUNCTION: nerdtree#isTreeOpen() {{{2
function! nerdtree#isTreeOpen()
    return nerdtree#getTreeWinNum() != -1
endfunction

"FUNCTION: nerdtree#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! nerdtree#isWindowUsable(winnumber)
    "gotta split if theres only one window (i.e. the NERD tree)
    if winnr("$") ==# 1
        return 0
    endif

    let oldwinnr = winnr()
    call nerdtree#exec(a:winnumber . "wincmd p")
    let specialWindow = getbufvar("%", '&buftype') != '' || getwinvar('%', '&previewwindow')
    let modified = &modified
    call nerdtree#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 || nerdtree#bufInWindows(winbufnr(a:winnumber)) >= 2
endfunction

" FUNCTION: nerdtree#jumpToChild(direction) {{{2
" Args:
" direction: 0 if going to first child, 1 if going to last
function! nerdtree#jumpToChild(currentNode, direction)
    if a:currentNode.isRoot()
        return nerdtree#echo("cannot jump to " . (a:direction ? "last" : "first") .  " child")
    end
    let dirNode = a:currentNode.parent
    let childNodes = dirNode.getVisibleChildren()

    let targetNode = childNodes[0]
    if a:direction
        let targetNode = childNodes[len(childNodes) - 1]
    endif

    if targetNode.equals(a:currentNode)
        let siblingDir = a: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 nerdtree#centerView()
endfunction

" FUNCTION: nerdtree#jumpToSibling(currentNode, forward) {{{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! nerdtree#jumpToSibling(currentNode, forward)
    let sibling = a:currentNode.findSibling(a:forward)

    if !empty(sibling)
        call sibling.putCursorHere(1, 0)
        call nerdtree#centerView()
    endif
endfunction

"FUNCTION: nerdtree#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! nerdtree#promptToDelBuffer(bufnum, msg)
    echo a:msg
    if nr2char(getchar()) ==# 'y'
        exec "silent bdelete! " . a:bufnum
    endif
endfunction

"FUNCTION: nerdtree#putCursorOnBookmarkTable(){{{2
"Places the cursor at the top of the bookmarks table
function! nerdtree#putCursorOnBookmarkTable()
    if !b:NERDTreeShowBookmarks
        throw "NERDTree.IllegalOperationError: cant find bookmark table, bookmarks arent active"
    endif

    if g:NERDTreeMinimalUI
        return cursor(1, 2)
    endif

    let rootNodeLine = g:NERDTreeFileNode.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, 2)
endfunction

"FUNCTION: nerdtree#putCursorInTreeWin(){{{2
"Places the cursor in the nerd tree window
function! nerdtree#putCursorInTreeWin()
    if !nerdtree#isTreeOpen()
        throw "NERDTree.InvalidOperationError: cant put cursor in NERD tree window, no window exists"
    endif

    call nerdtree#exec(nerdtree#getTreeWinNum() . "wincmd w")
endfunction

"FUNCTION: nerdtree#renderBookmarks {{{2
function! nerdtree#renderBookmarks()

    if g:NERDTreeMinimalUI == 0
        call setline(line(".")+1, ">----------Bookmarks----------")
        call cursor(line(".")+1, col("."))
    endif

    for i in g:NERDTreeBookmark.Bookmarks()
        call setline(line(".")+1, i.str())
        call cursor(line(".")+1, col("."))
    endfor

    call setline(line(".")+1, '')
    call cursor(line(".")+1, col("."))
endfunction

"FUNCTION: nerdtree#renderView {{{2
"The entry function for rendering the tree
function! nerdtree#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 nerdtree#dumpHelp()

    "delete the blank line before the help and add one after it
    if g:NERDTreeMinimalUI == 0
        call setline(line(".")+1, "")
        call cursor(line(".")+1, col("."))
    endif

    if b:NERDTreeShowBookmarks
        call nerdtree#renderBookmarks()
    endif

    "add the 'up a dir' line
    if !g:NERDTreeMinimalUI
        call setline(line(".")+1, nerdtree#treeUpDirLine())
        call cursor(line(".")+1, col("."))
    endif

    "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: nerdtree#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! nerdtree#renderViewSavingPosition()
    let currentNode = g:NERDTreeFileNode.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 nerdtree#renderView()

    if currentNode != {}
        call currentNode.putCursorHere(0, 0)
    endif
endfunction
"
"FUNCTION: nerdtree#restoreScreenState() {{{2
"
"Sets the screen state back to what it was when nerdtree#saveScreenState was last
"called.
"
"Assumes the cursor is in the NERDTree window
function! nerdtree#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: nerdtree#saveScreenState() {{{2
"Saves the current cursor position in the current buffer and the window
"scroll position
function! nerdtree#saveScreenState()
    let win = winnr()
    try
        call nerdtree#putCursorInTreeWin()
        let b:NERDTreeOldPos = getpos(".")
        let b:NERDTreeOldTopLine = line("w0")
        let b:NERDTreeOldWindowSize = winwidth("")
        call nerdtree#exec(win . "wincmd w")
    catch /^NERDTree.InvalidOperationError/
    endtry
endfunction

"FUNCTION: nerdtree#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! nerdtree#stripMarkupFromLine(line, removeLeadingSpaces)
    let line = a:line
    "remove the tree parts and the leading space
    let line = substitute (line, nerdtree#treeMarkupReg(),"","")

    "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

" vim: set sw=4 sts=4 et fdm=marker: