Add a NERDTreeToggleVCS command to the vcs plugin

CHANGELOG.md

@@ -7,7 +7,8 @@
     in an unordered list.  The format is:
         - **.PATCH**: Pull Request Title (PR Author) [PR Number](Link to PR)
 -->
-
+#### 6.3
+- **.0**: Add new command that behaves like NERDTreeToggle but defaults to the root of a VCS repository. (willfindlay) [#1060](https://github.com/scrooloose/nerdtree/pull/1060)
 #### 6.2
 - **.1**: Menu option, 'copy path to clipboard' is aware of VIM clipboard option (jhzn) [#1056](https://github.com/scrooloose/nerdtree/pull/1056)
 - **.0**: Support tab-specific CWDs (PhilRunninger) [#1032](https://github.com/scrooloose/nerdtree/pull/1032)

doc/NERDTree.txt

@@ -125,6 +125,14 @@ The following features and functionality are provided by the NERDTree:
     again.  If no NERDTree exists for this tab then this command acts the
     same as the |:NERDTree| command.
 
+:NERDTreeToggleVCS [<start-directory> | <bookmark>]            *:NERDTreeToggleVCS*
+    Like |:NERDTreeToggle|, but searches up the directory tree to find the top of
+    the version control system repository, and roots the NERDTree there. It
+    works with Git, Subversion, Mercurial, Bazaar, and Darcs repositories. A
+    couple of examples: >
+        :NERDTreeToggleVCS /home/marty/nerdtree/doc  (opens /home/marty/nerdtree)
+        :NERDTreeToggleVCS              (opens root of repository containing CWD)
+
 :NERDTreeFocus                                                  *:NERDTreeFocus*
     Opens (or reopens) the NERDTree if it is not currently visible;
     otherwise, the cursor is moved to the already-open NERDTree.

nerdtree_plugin/vcs.vim

@@ -11,6 +11,7 @@
 "
 " ============================================================================
 command! -n=? -complete=dir -bar NERDTreeVCS :call <SID>CreateTabTreeVCS('<args>')
+command! -n=? -complete=dir -bar NERDTreeToggleVCS :call <SID>ToggleTabTreeVCS('<args>')
 
 " FUNCTION: s:CreateTabTreeVCS(a:name) {{{1
 function! s:CreateTabTreeVCS(name)
@@ -19,6 +20,14 @@ function! s:CreateTabTreeVCS(name)
     call g:NERDTreeCreator.createTabTree(empty(l:path) ? "" : l:path._str())
 endfunction
 
+" FUNCTION: s:ToggleTabTreeVCS(a:name) {{{1
+" Behaves the same as ToggleTabTree except roots directory at VCS root
+function! s:ToggleTabTreeVCS(name)
+    let l:path = g:NERDTreeCreator._pathForString(a:name)
+    let l:path = s:FindParentVCSRoot(l:path)
+    call g:NERDTreeCreator.toggleTabTree(empty(l:path) ? "" : l:path._str())
+endfunction
+
 " FUNCTION: s:FindParentVCSRoot(a:path) {{{1
 " Finds the root version control system folder of the given path. If a:path is
 " not part of a repository, return the original path.