nerdtree/doc/NERD_tree.txt

*NERD_tree.txt*   A tree explorer plugin that owns your momma!



    omg its ... ~

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   /_  __/ / / / ____/  / | / / ____/ __ \/ __ \   /_  __/ __ \/ ____/ ____/~
    / / / /_/ / __/    /  |/ / __/ / /_/ / / / /    / / / /_/ / __/ / __/   ~
   / / / __  / /___   / /|  / /___/ _, _/ /_/ /    / / / _, _/ /___/ /___   ~
  /_/ /_/ /_/_____/  /_/ |_/_____/_/ |_/_____/    /_/ /_/ |_/_____/_____/   ~


                              Reference Manual~




==============================================================================
CONTENTS                                                   *NERDTree-contents*

    1.Intro...................................|NERDTree|
    2.Functionality provided..................|NERDTreeFunctionality|
        2.1.Global commands...................|NERDTreeGlobalCommands|
        2.2.Bookmarks.........................|NERDTreeBookmarks|
            2.2.1.The bookmark table..........|NERDTreeBookmarkTable|
            2.2.2.Bookmark commands...........|NERDTreeBookmarkCommands|
            2.2.3.Invalid bookmarks...........|NERDTreeInvalidBookmarks|
        2.3.NERD tree mappings................|NERDTreeMappings|
        2.4.The filesystem menu...............|NERDTreeFilesysMenu|
    3.Options.................................|NERDTreeOptions|
        3.1.Option summary....................|NERDTreeOptionSummary|
        3.2.Option details....................|NERDTreeOptionDetails|
    4.Hacking the NERD tree...................|NERDTreeHacking|
    5.About...................................|NERDTreeAbout|
    6.Changelog...............................|NERDTreeChangelog|
    7.Credits.................................|NERDTreeCredits|
    8.License.................................|NERDTreeLicense|

==============================================================================
1. Intro                                                            *NERDTree*

What is this "NERD tree"??

The NERD tree allows you to explore your filesystem and to open files and
directories. It presents the filesystem to you in the form of a tree which you
manipulate with the keyboard and/or mouse. It also allows you to perform
simple filesystem operations.

The following features and functionality are provided by the NERD tree:
    * Files and directories are displayed in a hierarchical tree structure
    * Different highlighting is provided for the following types of nodes:
        * files
        * directories
        * sym-links
        * windows .lnk files
        * read-only files
        * executable files
    * Many (customisable) mappings are provided to manipulate the tree:
        * Mappings to open/close/explore directory nodes
        * Mappings to open files in new/existing windows/tabs
        * Mappings to change the current root of the tree
        * Mappings to navigate around the tree
        * ...
    * Directories and files can be bookmarked.
    * Most NERD tree navigation can also be done with the mouse
    * Filtering of tree content (can be toggled at runtime)
        * custom file filters to prevent e.g. vim backup files being displayed
        * optional displaying of hidden files (. files)
        * files can be "turned off" so that only directories are displayed
    * A textual filesystem menu is provided which allows you to
      create/delete/move file and directory nodes as well as copy (for
      supported OSs)
    * The position and size of the NERD tree window can be customised
    * The order in which the nodes in the tree are listed can be customised.
    * A model of your filesystem is created/maintained as you explore it. This
      has several advantages:
        * All filesystem information is cached and is only re-read on demand
        * If you revisit a part of the tree that you left earlier in your
          session, the directory nodes will be opened/closed as you left them
    * The script remembers the cursor position and window position in the NERD
      tree so you can toggle it off (or just close the tree window) and then
      reopen it (with NERDTreeToggle) the NERD tree window will appear exactly
      as you left it
    * You can have a separate NERD tree for each tab, share trees across tabs,
      or a mix of both.
    * By default the script overrides the default file browser (netw), so if
      you :edit a directory a (slighly modified) NERD tree will appear in the
      current window

==============================================================================
2. Functionality provided                              *NERDTreeFunctionality*

------------------------------------------------------------------------------
2.1. Global Commands                                  *NERDTreeGlobalCommands*

:NERDTree [<start-directory> | <bookmark>]                         *:NERDTree*
    Opens a fresh NERD tree. The root of the tree depends on the argument
    given. There are 3 cases: If no argument is given, the current directory
    will be used.  If a directory is given, that will be used. If a bookmark
    name is given, the corresponding directory will be used.  For example: >
        :NERDTree /home/marty/vim7/src
        :NERDTree foo   (foo is the name of a bookmark)
<
:NERDTreeFromBookmark <bookmark>                       *:NERDTreeFromBookmark*
    Opens a fresh NERD tree with the root initialized to the dir for
    <bookmark>.  This only reason to use this command over :NERDTree is for
    the completion (which is for bookmarks rather than directories).

:NERDTreeToggle [<start-directory> | <bookmark>]             *:NERDTreeToggle*
    If a NERD tree already exists for this tab, it is reopened and rendered
    again.  If no NERD tree exists for this tab then this command acts the
    same as the |:NERDTree| command.

:NERDTreeMirror                                              *:NERDTreeMirror*
    Shares an existing NERD tree, from another tab, in the current tab.
    Changes made to one tree are reflected in both as they are actually the
    same buffer.

    If only one other NERD tree exists, that tree is automatically mirrored. If
    more than one exists, the script will ask which tree to mirror.

:NERDTreeClose                                                *:NERDTreeClose*
    Close the NERD tree in this tab.

------------------------------------------------------------------------------
2.2. Bookmarks                                             *NERDTreeBookmarks*

Bookmarks in the NERD tree are a way to tag files or directories of interest.
For example, you could use bookmarks to tag all of your project directories.

------------------------------------------------------------------------------
2.2.1. The Bookmark Table                              *NERDTreeBookmarkTable*

If the bookmark table is active (see |NERDTree-B| and
|'NERDTreeShowBookmarks'|), it will be rendered above the tree. You can double
click bookmarks or use the |NERDTree-o| mapping to activate them. See also,
|NERDTree-t| and |NERDTree-T|

------------------------------------------------------------------------------
2.2.2. Bookmark commands                            *NERDTreeBookmarkCommands*

Note that the following commands are only available in the NERD tree buffer.

:Bookmark <name>
    Bookmark the current node as <name>. If there is already a <name>
    bookmark, it is overwritten. <name> must not contain spaces.

:BookmarkToRoot <bookmark>
    Make the directory corresponding to <bookmark> the new root. If a treenode
    corresponding to <bookmark> is already cached somewhere in the tree then
    the current tree will be used, otherwise a fresh tree will be opened.
    Note that if <bookmark> points to a file then its parent will be used
    instead.

:RevealBookmark <bookmark>
    If the node is cached under the current root then it will be revealed
    (i.e. directory nodes above it will be opened) and the cursor will be
    placed on it.

:OpenBookmark <bookmark>
    <bookmark> must point to a file. The file is opened as though |NERDTree-o|
    was applied. If the node is cached under the current root then it will be
    revealed and the cursor will be placed on it.

:ClearBookmarks [<bookmarks>]
    Remove all the given bookmarks. If no bookmarks are given then remove all
    bookmarks on the current node.

:ClearAllBookmarks
    Remove all bookmarks.

:ReadBookmarks
    Re-read the bookmarks in the |'NERDTreeBookmarksFile'|.

See also |:NERDTree| and |:NERDTreeFromBookmark|.

------------------------------------------------------------------------------
2.2.3. Invalid Bookmarks                            *NERDTreeInvalidBookmarks*

If invalid bookmarks are detected, the script will issue an error message and
the invalid bookmarks will become unavailable for use.

These bookmarks will still be stored in the bookmarks file (see
|'NERDTreeBookmarksFile'|), down the bottom. There will always be a blank line
after the valid bookmarks but before the invalid ones.

Each line in the bookmarks file represents one bookmark. The proper format is:
<bookmark name><space><full path to the bookmark location>

After you have corrected any invalid bookmarks, either restart vim, or go
:ReadBookmarks from the NERD tree window.

------------------------------------------------------------------------------
2.3. NERD tree Mappings                                     *NERDTreeMappings*

Default  Description~                                             help-tag~
Key~

o.......Open files, directories and bookmarks....................|NERDTree-o|
go......Open selected file, but leave cursor in the NERDTree.....|NERDTree-go|
t.......Open selected node/bookmark in a new tab.................|NERDTree-t|
T.......Same as 't' but keep the focus on the current tab........|NERDTree-T|
i.......Open selected file in a split window.....................|NERDTree-i|
gi......Same as i, but leave the cursor on the NERDTree..........|NERDTree-i|
!.......Execute the current file.................................|NERDTree-!|
O.......Recursively open the selected directory..................|NERDTree-O|
x.......Close the current nodes parent...........................|NERDTree-x|
X.......Recursively close all children of the current node.......|NERDTree-X|
e.......Edit the current dif.....................................|NERDTree-e|

double-click.......same as the |NERDTree-o| map.
middle-click.......same as |NERDTree-i| for files, same as
                   |NERDTree-e| for dirs.

D.......Delete the current bookmark .............................|NERDTree-D|

P.......Jump to the root node....................................|NERDTree-P|
p.......Jump to current nodes parent.............................|NERDTree-p|
K.......Jump up inside directories at the current tree depth.....|NERDTree-K|
J.......Jump down inside directories at the current tree depth...|NERDTree-J|
<C-j>...Jump down to the next sibling of the current directory...|NERDTree-c-j|
<C-k>...Jump up to the previous sibling of the current directory.|NERDTree-c-k|

C.......Change the tree root to the selected dir.................|NERDTree-C|
u.......Move the tree root up one directory......................|NERDTree-u|
U.......Same as 'u' except the old root node is left open........|NERDTree-U|
r.......Recursively refresh the current directory................|NERDTree-r|
R.......Recursively refresh the current root.....................|NERDTree-R|
m.......Display the filesystem menu..............................|NERDTree-m|
cd......Change the CWD to the dir of the selected node...........|NERDTree-cd|

I.......Toggle whether hidden files displayed....................|NERDTree-I|
f.......Toggle whether the file filters are used.................|NERDTree-f|
F.......Toggle whether files are displayed.......................|NERDTree-F|
B.......Toggle whether the bookmark table is displayed...........|NERDTree-B|

q.......Close the NERDTree window................................|NERDTree-q|
?.......Toggle the display of the quick help.....................|NERDTree-?|

------------------------------------------------------------------------------
                                                                  *NERDTree-o*
Default key: o
Map option: NERDTreeMapActivateNode
Applies to: files and directories.

If a file node is selected, it is opened in the previous window.

If a directory is selected it is opened or closed depending on its current
state.

If a bookmark that links to a directory is selected then that directory
becomes the new root.

If a bookmark that links to a file is selected then that file is opened in the
previous window.

------------------------------------------------------------------------------
                                                                 *NERDTree-go*
Default key: go
Map option: None
Applies to: files.

If a file node is selected, it is opened in the previous window, but the
cursor does not move.

The key combo for this mapping is always "g" + NERDTreeMapActivateNode (see
|NERDTree-o|).

------------------------------------------------------------------------------
                                                                  *NERDTree-t*
Default key: t
Map option: NERDTreeMapOpenInTab
Applies to: files and directories.

Opens the selected file in a new tab. If a directory is selected, a fresh
NERD Tree for that directory is opened in a new tab.

If a bookmark which points to a directory is selected, open a NERD tree for
that directory in a new tab. If the bookmark points to a file, open that file
in a new tab.

------------------------------------------------------------------------------
                                                                  *NERDTree-T*
Default key: T
Map option: NERDTreeMapOpenInTabSilent
Applies to: files and directories.

The same as |NERDTree-t| except that the focus is kept in the current tab.

------------------------------------------------------------------------------
                                                                  *NERDTree-i*
Default key: i
Map option: NERDTreeMapOpenSplit
Applies to: files.

Opens the selected file in a new split window and puts the cursor in the new
window.

------------------------------------------------------------------------------
                                                                 *NERDTree-gi*
Default key: gi
Map option: None
Applies to: files.

The same as |NERDTree-i| except that the cursor is not moved.

The key combo for this mapping is always "g" + NERDTreeMapOpenSplit (see
|NERDTree-i|).

------------------------------------------------------------------------------
                                                                  *NERDTree-!*
Default key: !
Map option: NERDTreeMapExecute
Applies to: files.

Executes the selected file, prompting for arguments first.

------------------------------------------------------------------------------
                                                                  *NERDTree-O*
Default key: O
Map option: NERDTreeMapOpenRecursively
Applies to: directories.

Recursively opens the selelected directory.

All files and directories are cached, but if a directory would not be
displayed due to file filters (see |'NERDTreeIgnore'| |NERDTree-f|) or the
hidden file filter (see |'NERDTreeShowHidden'|) then its contents are not
cached. This is handy, especially if you have .svn directories.

------------------------------------------------------------------------------
                                                                  *NERDTree-x*
Default key: x
Map option: NERDTreeMapCloseDir
Applies to: files and directories.

Closes the parent of the selected node.

------------------------------------------------------------------------------
                                                                  *NERDTree-X*
Default key: X
Map option: NERDTreeMapCloseChildren
Applies to: directories.

Recursively closes all children of the selected directory.

Tip: To quickly "reset" the tree, use |NERDTree-P| with this mapping.

------------------------------------------------------------------------------
                                                                  *NERDTree-e*
Default key: e
Map option: NERDTreeMapOpenExpl
Applies to: files and directories.

|:edit|s the selected directory, or the selected file's directory. This could
result in a NERD tree or a netrw being opened, depending on
|'NERDTreeHijackNetrw'|.

------------------------------------------------------------------------------
                                                                  *NERDTree-D*
Default key: D
Map option: NERDTreeMapDeleteBookmark
Applies to: lines in the bookmarks table

Deletes the currently selected bookmark.

------------------------------------------------------------------------------
                                                                  *NERDTree-P*
Default key: P
Map option: NERDTreeMapJumpRoot
Applies to: no restrictions.

Jump to the tree root.

------------------------------------------------------------------------------
                                                                  *NERDTree-p*
Default key: p
Map option: NERDTreeMapJumpParent
Applies to: files and directories.

Jump to the parent node of the selected node.

------------------------------------------------------------------------------
                                                                  *NERDTree-K*
Default key: K
Map option: NERDTreeMapJumpFirstChild
Applies to: files and directories.

Jump to the first child of the current nodes parent.

If the cursor is already on the first node then do the following:
    * loop back thru the siblings of the current nodes parent until we find an
      open dir with children
    * go to the first child of that node

------------------------------------------------------------------------------
                                                                  *NERDTree-J*
Default key: J
Map option: NERDTreeMapJumpLastChild
Applies to: files and directories.

Jump to the last child of the current nodes parent.

If the cursor is already on the last node then do the following:
    * loop forward thru the siblings of the current nodes parent until we find
      an open dir with children
    * go to the last child of that node

------------------------------------------------------------------------------
                                                                *NERDTree-c-j*
Default key: <C-j>
Map option: NERDTreeMapJumpNextSibling
Applies to: files and directories.

Jump to the next sibling of the selected node.

------------------------------------------------------------------------------
                                                                *NERDTree-c-k*
Default key: <C-k>
Map option: NERDTreeMapJumpPrevSibling
Applies to: files and directories.

Jump to the previous sibling of the selected node.

------------------------------------------------------------------------------
                                                                  *NERDTree-C*
Default key: C
Map option: NERDTreeMapChdir
Applies to: directories.

Make the selected directory node the new tree root. If a file is selected, its
parent is used.

------------------------------------------------------------------------------
                                                                  *NERDTree-u*
Default key: u
Map option: NERDTreeMapUpdir
Applies to: no restrictions.

Move the tree root up a dir (like doing a "cd ..").

------------------------------------------------------------------------------
                                                                  *NERDTree-U*
Default key: U
Map option: NERDTreeMapUpdirKeepOpen
Applies to: no restrictions.

Like |NERDTree-u| except that the old tree root is kept open.

------------------------------------------------------------------------------
                                                                  *NERDTree-r*
Default key: r
Map option: NERDTreeMapRefresh
Applies to: files and directories.

If a dir is selected, recursively refresh that dir, i.e. scan the filesystem
for changes and represent them in the tree.

If a file node is selected then the above is done on it's parent.

------------------------------------------------------------------------------
                                                                  *NERDTree-R*
Default key: R
Map option: NERDTreeMapRefreshRoot
Applies to: no restrictions.

Recursively refresh the tree root.

------------------------------------------------------------------------------
                                                                  *NERDTree-m*
Default key: m
Map option: NERDTreeMapFilesystemMenu
Applies to: files and directories.

Display the filesystem menu. See |NERDTreeFilesysMenu| for details.

------------------------------------------------------------------------------
                                                                  *NERDTree-I*
Default key: I
Map option: NERDTreeMapToggleHidden
Applies to: no restrictions.

Toggles whether hidden files (i.e. "dot files") are displayed.

------------------------------------------------------------------------------
                                                                  *NERDTree-f*
Default key: f
Map option: NERDTreeMapToggleFilters
Applies to: no restrictions.

Toggles whether file filters are used. See |'NERDTreeIgnore'| for details.

------------------------------------------------------------------------------
                                                                  *NERDTree-F*
Default key: F
Map option: NERDTreeMapToggleFiles
Applies to: no restrictions.

Toggles whether file nodes are displayed.

------------------------------------------------------------------------------
                                                                  *NERDTree-B*
Default key: B
Map option: NERDTreeMapToggleBookmarks
Applies to: no restrictions.

Toggles whether the bookmarks table is displayed.

------------------------------------------------------------------------------
                                                                  *NERDTree-q*
Default key: q
Map option: NERDTreeMapQuit
Applies to: no restrictions.

Closes the NERDtree window.

------------------------------------------------------------------------------
                                                                  *NERDTree-?*
Default key: ?
Map option: NERDTreeMapHelp
Applies to: no restrictions.

Toggles whether the quickhelp is displayed.

------------------------------------------------------------------------------
2.3. The filesystem menu                                 *NERDTreeFilesysMenu*

The purpose of the filesystem menu is to allow you to perform basic filesystem
operations quickly from the NERD tree rather than the console.

The filesystem menu can be accessed with 'm' mapping and has four supported
operations: >
    1. Adding nodes.
    2. Move nodes.
    3. Deleting nodes.
    3. Copying nodes.
<
1. Adding nodes:
To add a node move the cursor onto (or anywhere inside) the directory you wish
to create the new node inside. Select the 'add node' option from the
filesystem menu and type a filename. If the filename you type ends with a '/'
character then a directory will be created. Once the operation is completed,
the cursor is placed on the new node.

2. Move nodes:
To move/rename a node, put the cursor on it and select the 'move' option from
the filesystem menu.  Enter the new location for the node and it will be
moved.  If the old file is open in a buffer, you will be asked if you wish to
delete that buffer. Once the operation is complete the cursor will be placed
on the renamed node.

3. Deleting nodes:
To delete a node put the cursor on it and select the 'delete' option from the
filesystem menu. After confirmation the node will be deleted. If a file is
deleted but still exists as a buffer you will be given the option to delete
that buffer.

4. Copying nodes:
To copy a node put the cursor on it and select the 'copy' option from the
filesystem menu. Enter the new location and you're done. Note: copying is
currently only supported for *nix operating systems. If someone knows a
one line copying command for windows that doesnt require user confirmation
then id be grateful if you'd email me.

==============================================================================
3. Customisation                                             *NERDTreeOptions*


------------------------------------------------------------------------------
3.1. Customisation summary                             *NERDTreeOptionSummary*

The script provides the following options that can customise the behaviour the
NERD tree. These options should be set in your vimrc.

|'loaded_nerd_tree'|            Turns off the script.

|'NERDChristmasTree'|           Tells the NERD tree to make itself colourful
                                and pretty.

|'NERDTreeAutoCenter'|          Controls whether the NERD tree window centers
                                when the cursor moves within a specified
                                distance to the top/bottom of the window.
|'NERDTreeAutoCenterThreshold'| Controls the sensitivity of autocentering.

|'NERDTreeCaseSensitiveSort'|   Tells the NERD tree whether to be case
                                sensitive or not when sorting nodes.

|'NERDTreeChDirMode'|           Tells the NERD tree if/when it should change
                                vim's current working directory.

|'NERDTreeHighlightCursorline'| Tell the NERD tree whether to highlight the
                                current cursor line.

|'NERDTreeHijackNetrw'|         Tell the NERD tree whether to replace the netrw
                                autocommands for exploring local directories.

|'NERDTreeIgnore'|              Tells the NERD tree which files to ignore.

|'NERDTreeBookmarksFile'|       Where the bookmarks are stored.

|'NERDTreeMouseMode'|           Tells the NERD tree how to handle mouse
                                clicks.

|'NERDTreeQuitOnOpen'|          Closes the tree window after opening a file.

|'NERDTreeShowBookmarks'|       Tells the NERD tree whether to display the
                                bookmarks table on startup.

|'NERDTreeShowFiles'|           Tells the NERD tree whether to display files
                                in the tree on startup.

|'NERDTreeShowHidden'|          Tells the NERD tree whether to display hidden
                                files on startup.

|'NERDTreeShowLineNumbers'|     Tells the NERD tree whether to display line
                                numbers in the tree window.

|'NERDTreeSortOrder'|           Tell the NERD tree how to sort the nodes in
                                the tree.

|'NERDTreeWinPos'|              Tells the script where to put the NERD tree
                                window.

|'NERDTreeWinSize'|             Sets the window size when the NERD tree is
                                opened.

------------------------------------------------------------------------------
3.2. Customisation details                             *NERDTreeOptionDetails*

To enable any of the below options you should put the given line in your
~/.vimrc

                                                          *'loaded_nerd_tree'*
If this plugin is making you feel homicidal, it may be a good idea to turn it
off with this line in your vimrc: >
    let loaded_nerd_tree=1
<
------------------------------------------------------------------------------
                                                         *'NERDChristmasTree'*
Values: 0 or 1.
Default: 1.

If this option is set to 1 then some extra syntax highlighting elements are
added to the nerd tree to make it more colourful.

Set it to 0 for a more vanilla looking tree.

------------------------------------------------------------------------------
                                                        *'NERDTreeAutoCenter'*
Values: 0 or 1.
Default: 1

If set to 1, the NERD tree window will center around the cursor if it moves to
within |'NERDTreeAutoCenterThreshold'| lines of the top/bottom of the window.

This is ONLY done in response to tree navigation mappings,
i.e. |NERDTree-J| |NERDTree-K| |NERDTree-C-J| |NERDTree-c-K| |NERDTree-p|
|NERDTree-P|

The centering is done with a |zz| operation.

------------------------------------------------------------------------------
                                               *'NERDTreeAutoCenterThreshold'*
Values: Any natural number.
Default: 3

This option controls the "sensitivity" of the NERD tree auto centering. See
|'NERDTreeAutoCenter'| for details.

------------------------------------------------------------------------------
                                                 *'NERDTreeCaseSensitiveSort'*
Values: 0 or 1.
Default: 0.

By default the NERD tree does not sort nodes case sensitively, i.e. nodes
could appear like this: >
    bar.c
    Baz.c
    blarg.c
    boner.c
    Foo.c
<
But, if you set this option to 1 then the case of the nodes will be taken into
account. The above nodes would then be sorted like this: >
    Baz.c
    Foo.c
    bar.c
    blarg.c
    boner.c
<
------------------------------------------------------------------------------
                                                         *'NERDTreeChDirMode'*

Values: 0, 1 or 2.
Default: 0.

Use this option to tell the script when (if at all) to change the current
working directory (CWD) for vim.

If it is set to 0 then the CWD is never changed by the NERD tree.

If set to 1 then the CWD is changed when the NERD tree is first loaded to the
directory it is initialized in. For example, if you start the NERD tree with >
    :NERDTree /home/marty/foobar
<
then the CWD will be changed to /home/marty/foobar and will not be changed
again unless you init another NERD tree with a similar command.

If the option is set to 2 then it behaves the same as if set to 1 except that
the CWD is changed whenever the tree root is changed. For example, if the CWD
is /home/marty/foobar and you make the node for /home/marty/foobar/baz the new
root then the CWD will become /home/marty/foobar/baz.

------------------------------------------------------------------------------
                                               *'NERDTreeHighlightCursorline'*
Values: 0 or 1.
Default: 1.

If set to 1, the current cursor line in the NERD tree buffer will be
highlighted. This is done using the |cursorline| option.

------------------------------------------------------------------------------
                                                       *'NERDTreeHijackNetrw'*
Values: 0 or 1.
Default: 1.

If set to 1, doing a >
    :edit <some directory>
<
will open up a "secondary" NERD tree instead of a netrw in the target window.

Secondary NERD trees behaves slighly different from a regular trees in the
following respects:
    1. 'o' will open the selected file in the same window as the tree,
       replacing it.
    2. you can have as many secondary tree as you want in the same tab.

------------------------------------------------------------------------------
                                                            *'NERDTreeIgnore'*
Values: a list of regular expressions.
Default: ['\~$'].

This option is used to specify which files the NERD tree should ignore.  It
must be a list of regular expressions. When the NERD tree is rendered, any
files/dirs that match any of the regex's in 'NERDTreeIgnore' wont be
displayed.

For example if you put the following line in your vimrc: >
    let NERDTreeIgnore=['\.vim$', '\~$']
<
then all files ending in .vim or ~ will be ignored.

Note: to tell the NERD tree not to ignore any files you must use the following
line: >
    let NERDTreeIgnore=[]
<

The file filters can be turned on and off dynamically with the |NERDTree-f|
mapping.

------------------------------------------------------------------------------
                                                     *'NERDTreeBookmarksFile'*
Values: a path
Default: $HOME/.NERDTreeBookmarks

This is where bookmarks are saved. See |NERDTreeBookmarkCommands|.

------------------------------------------------------------------------------
                                                       *'NERDTreeMouseMode'*
Values: 1, 2 or 3.
Default: 1.

If set to 1 then a double click on a node is required to open it.
If set to 2 then a single click will open directory nodes, while a double
click will still be required for file nodes.
If set to 3 then a single click will open any node.

Note: a double click anywhere on a line that a tree node is on will
activate it, but all single-click activations must be done on name of the node
itself. For example, if you have the following node: >
    | | |-application.rb
<
then (to single click activate it) you must click somewhere in
'application.rb'.

------------------------------------------------------------------------------
                                                        *'NERDTreeQuitOnOpen'*

Values: 0 or 1.
Default: 0

If set to 1, the NERD tree window will close after opening a file with the
|NERDTree-o| or |NERDTree-i| mappings.

------------------------------------------------------------------------------
                                                     *'NERDTreeShowBookmarks'*
Values: 0 or 1.
Default: 0.

If this option is set to 1 then the bookmarks table will be displayed.

This option can be toggled dynamically, per tree, with the |NERDTree-B|
mapping.

------------------------------------------------------------------------------
                                                         *'NERDTreeShowFiles'*
Values: 0 or 1.
Default: 1.

If this option is set to 1 then files are displayed in the NERD tree. If it is
set to 0 then only directories are displayed.

This option can be toggled dynamically, per tree, with the |NERDTree-F|
mapping and is useful for drastically shrinking the tree when you are
navigating to a different part of the tree.

------------------------------------------------------------------------------
                                                        *'NERDTreeShowHidden'*
Values: 0 or 1.
Default: 0.

This option tells vim whether to display hidden files by default. This option
can be dynamically toggled, per tree, with the |NERDTree-I| mapping.  Use one
of the follow lines to set this option: >
    let NERDTreeShowHidden=0
    let NERDTreeShowHidden=1
<

------------------------------------------------------------------------------
                                                   *'NERDTreeShowLineNumbers'*
Values: 0 or 1.
Default: 0.

This option tells vim whether to display line numbers for the NERD tree
window.  Use one of the follow lines to set this option: >
    let NERDTreeShowLineNumbers=0
    let NERDTreeShowLineNumbers=1
<

------------------------------------------------------------------------------
                                                         *'NERDTreeSortOrder'*
Values: a list of regular expressions.
Default: ['\/$', '*', '\.swp$',  '\.bak$', '\~$']

This option is set to a list of regular expressions which are used to
specify the order of nodes under their parent.

For example, if the option is set to: >
    ['\.vim$', '\.c$', '\.h$', '*', 'foobar']
<
then all .vim files will be placed at the top, followed by all .c files then
all .h files. All files containing the string 'foobar' will be placed at the
end.  The star is a special flag: it tells the script that every node that
doesnt match any of the other regexps should be placed here.

If no star is present in 'NERDTreeSortOrder' then one is automatically
appended to the array.

The regex '\/$' should be used to match directory nodes.

After this sorting is done, the files in each group are sorted alphabetically.

Other examples: >
    (1) ['*', '\/$']
    (2) []
    (3) ['\/$', '\.rb$', '\.php$', '*', '\.swp$',  '\.bak$', '\~$']
<
1. Directories will appear last, everything else will appear above.
2. Everything will simply appear in alphabetical order.
3. Dirs will appear first, then ruby and php. Swap files, bak files and vim
   backup files will appear last with everything else preceding them.

------------------------------------------------------------------------------
                                                            *'NERDTreeWinPos'*
Values: "left" or "right"
Default: "left".

This option is used to determine where NERD tree window is placed on the
screen.

This option is makes it possible to use two different explorer type
plugins simultaneously. For example, you could have the taglist plugin on the
left of the window and the NERD tree on the right.

------------------------------------------------------------------------------
                                                           *'NERDTreeWinSize'*
Values: a positive integer.
Default: 31.

This option is used to change the size of the NERD tree when it is loaded.

==============================================================================
4. Hacking the NERD tree                                     *NERDTreeHacking*

Public functions ~

The script provides 2 public functions for your hacking pleasure. Their
signatures are: >
    function! NERDTreeGetCurrentNode()
    function! NERDTreeGetCurrentPath()
<
The first returns the node object that the cursor is currently on, while the
second returns the corresponding path object.

This is probably a good time to mention that the script implements prototype
style OO. To see the functions that each class provides you can read look at
the code.

Use the node objects to manipulate the structure of the tree. Use the path
objects to access the files/directories the tree nodes represent.

The NERD tree filetype ~

NERD tree buffers have a filetype of "nerdtree". You can use this to hack the
NERD tree via autocommands (on |FileType|) or via an ftplugin.

For example, putting this code in ~/.vim/ftplugin/nerdtree.vim would override
the o mapping, making it open the selected node in a new gvim instance. >

    nnoremap <silent> <buffer> o :call <sid>openInNewVimInstance()<cr>
    function! s:openInNewVimInstance()
        let p = NERDTreeGetCurrentPath()
        if p != {}
            silent exec "!gvim " . p.strForOS(1) . "&"
        endif
    endfunction
<
This way you can add new mappings or :commands or override any existing
mapping.

==============================================================================
5. About                                                       *NERDTreeAbout*

The author of the NERD tree is a terrible terrible monster called Martyzilla
who gobbles up small children with milk and sugar for breakfast.

He can be reached at martin_grenfell at msn.com. He would love to hear from
you, so feel free to send him suggestions and/or comments about this plugin.
Don't be shy --- the worst he can do is slaughter you and stuff you in the
fridge for later ;)

The latest stable versions can be found at
    http://www.vim.org/scripts/script.php?script_id=1658

The latest dev versions are on github
    http://github.com/scrooloose/nerdtree


==============================================================================
6. Changelog                                               *NERDTreeChangelog*

3.0.1
    Bugfixes:
    - fix a bug where :NERDTreeToggle was broken unless 'hidden was set
    - fix a bug with :NERDTreeMirror when 'hidden wasnt set
    - make the q mapping work with secondary (:e <dir>  style) nerd trees
    - ensure buffer names for secondary nerd trees are unique, this fixes a
      number of small bugs
    More insane refactoring.

3.0.0
    - hijack netrw so that doing an :edit <directory>  will put a NERD tree in
      the window rather than a netrw browser. See :help 'NERDTreeHijackNetrw'
    - allow sharing of trees across tabs, see :help :NERDTreeMirror
    - remove "top" and "bottom" as valid settings for NERDTreeWinPos
    - change the '<tab>' mapping to 'i'
    - change the 'H' mapping to 'I'
    - lots of refactoring

==============================================================================
7. Credits                                                   *NERDTreeCredits*

Thanks to Tim Carey-Smith for testing/using the NERD tree from the first
pre-beta version, for his many suggestions and for his constant stream of bug
complaints.

Thanks to Vigil for trying it out before the first release :) and suggesting
that mappings to open files in new tabs should be implemented.

Thanks to Nick Brettell for testing, fixing my spelling and suggesting i put a
    .. (up a directory)
line in the gui.

Thanks to Thomas Scott Urban - the author of the vtreeexplorer plugin - whose
gui code i borrowed from.

Thanks to Terrance Cohen for pointing out a bug where the script was changing
vims CWD all over the show.

Thanks to Yegappan Lakshmanan (author of Taglist and other orgasmically
wonderful plugins) for telling me how to fix a bug that was causing vim to go
into visual mode everytime you double clicked a node :)

Thanks to Jason Mills for sending me a fix that allows windows paths to use
forward slashes as well as backward.

Thanks to Michael Geddes (frogonwheels on #vim at freenode) for giving me some
tips about syntax highlighting when i was doing highlighting for the
quickhelp.

Thanks to Yu Jun for emailing me about a bug that was occurring when closing
the tree.

Thanks to Michael Madsen for emailing me about making case sensitivity
optional when sorting nodes.

Thanks to AOYAMA Shotaro for suggesting that i echo a "please wait" message
when opening large directories.

Thanks to Michael Madsen for requesting the NERDTreeCaseSensitiveSort option.

Thanks to AOYAMA Shotaro for suggesting that a "please wait" style message be
echoed when opening large directories. Also, thanks for the suggestion of
having public functions in the script to access the internal data :D

Thanks to Zhang Weiwu for emailing me about a bug with the the <tab> mapping
in 2.6.0

Thanks to  Niels Aan de Brugh for the suggestion that the script now split the
window if you try to open a file in a window containing a modified buffer when
the &hidden option is set.

Thanks to Olivier Yiptong for prompting me to make line numbers in the
NERD tree window optional.

Thanks to Zhang Shuhan for all of his emails and testing to help improve the
NERD tree path handling. Thanks also for suggesting the bookmarks gui, and for
testing and his many suggestions and bugreports about bookmarks.

Thanks to Cory Echols for sending a patch to add the :NERDTreeClose command and
set the NERD tree buffers filetype to 'nerdtree'

Thanks to Piotr Czachur for all his suggestions and testing for the bookmarks
feature.

Thanks to Yuan Jiang for suggesting the "o" mapping shouldnt clobber "special"
windows, like taglist.

Thanks to Matan Nassau for the patch to add the NERDTreeQuitOnOpen option.

Thanks to Maxim Kim for reporting a bug with g<tab> and go mappings when
NERDTreeQuitOnOpen was set.

Thanks to Charlton Wang for reporting bugs with the 'o' mapping and with
handling named pipes.

Chur to godlygeek for reporting a bug where &cpo was getting clobbered.

Cheers to knekk for helping me track down a bug when overwriting dictionary
keys that only occurred in some versions of vim.

Thanks also to Sean Chou for the bug report about the above bug.

Thanks to Ryan Penn, Simon Peter Nicholls and Michael for pointing out an issue
where the script was splitting constantly when using the 'o' mapping while
other explorers were open.

Thanks to Tomasz Chomiuk for the bug report about the script failing when dir
names began with a +.

Thanks to Denis Pokataev for the bug report about the script failing when
closing vim with :qa with a tree open in another tab.

Thanks to tpope for his dope bug reporting.

==============================================================================
8. License                                                   *NERDTreeLicense*

The NERD tree is released under the wtfpl.
See http://sam.zoy.org/wtfpl/COPYING.