Make tree style (|+~ or arrows) configurable

Author: ku1ik

doc/NERD_tree.txt

@@ -642,6 +642,9 @@ NERD tree. These options should be set in your vimrc.
 |'NERDTreeWinSize'|             Sets the window size when the NERD tree is
                                 opened.
 
+|'NERDTreeDirArrows'|           Tells the NERD tree to use arrows instead of
+                                + ~ chars when displaying directories.
+
 ------------------------------------------------------------------------------
 3.2. Customisation details                             *NERDTreeOptionDetails*
 
@@ -921,6 +924,19 @@ Default: 31.
 
 This option is used to change the size of the NERD tree when it is loaded.
 
+------------------------------------------------------------------------------
+                                                           *'NERDTreeDirArrows'*
+Values: 0 or 1
+Default: 0.
+
+This option is used to change the default look of directory nodes displayed in
+the tree. When set to 0 it shows old-school bars (|), + and ~ chars. If set to
+1 it shows right and down arrows.  Use one of the follow lines to set this
+option: >
+    let NERDTreeDirArrows=0
+    let NERDTreeDirArrows=1
+<
+
 ==============================================================================
 4. The NERD tree API                                             *NERDTreeAPI*
 

plugin/NERD_tree.vim

@@ -65,6 +65,7 @@ call s:initVariable("g:NERDTreeShowFiles", 1)
 call s:initVariable("g:NERDTreeShowHidden", 0)
 call s:initVariable("g:NERDTreeShowLineNumbers", 0)
 call s:initVariable("g:NERDTreeSortDirs", 1)
+call s:initVariable("g:NERDTreeDirArrows", 0)
 
 if !exists("g:NERDTreeSortOrder")
     let g:NERDTreeSortOrder = ['\/$', '*', '\.swp$',  '\.bak$', '\~$']
@@ -147,7 +148,7 @@ endif
 let s:NERDTreeBufName = 'NERD_tree_'
 
 let s:tree_wid = 2
-let s:tree_markup_reg = '^[ `|▾▸]*[\-+~ ]*'
+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
@@ -1313,20 +1314,50 @@ function! s:TreeFileNode._renderToString(depth, drawText, vertMap, isLastChild)
         "get all the leading spaces and vertical tree parts for this line
         if a:depth > 1
             for j in a:vertMap[0:-2]
-                let treeParts = treeParts . '  '
+                if g:NERDTreeDirArrows
+                    let treeParts = treeParts . '  '
+                else
+                    if j ==# 1
+                        let treeParts = treeParts . '| '
+                    else
+                        let treeParts = treeParts . '  '
+                    endif
+                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 !g:NERDTreeDirArrows
+            if a:isLastChild
+                let treeParts = treeParts . '`'
+            else
+                let treeParts = treeParts . '|'
+            endif
+        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 . '▾ '
+                if g:NERDTreeDirArrows
+                    let treeParts = treeParts . '▾ '
+                else
+                    let treeParts = treeParts . '~'
+                endif
             else
-                let treeParts = treeParts . '▸ '
+                if g:NERDTreeDirArrows
+                    let treeParts = treeParts . '▸ '
+                else
+                    let treeParts = treeParts . '+'
+                endif
             endif
         else
-            let treeParts = treeParts . '  '
+            if g:NERDTreeDirArrows
+                let treeParts = treeParts . '  '
+            else
+                let treeParts = treeParts . '-'
+            endif
         endif
         let line = treeParts . self.displayString()
 
@@ -3054,10 +3085,12 @@ function! s:getPath(ln)
         return b:NERDTreeRoot.path
     endif
 
-    " in case called from outside the tree
-    " if line !~# '^ *[|`▸▾ ]' || line =~# '^$'
-    "     return {}
-    " endif
+    if !g:NERDTreeDirArrows
+        " in case called from outside the tree
+        if line !~# '^ *[|`▸▾ ]' || line =~# '^$'
+            return {}
+        endif
+    endif
 
     if line ==# s:tree_up_dir_line
         return b:NERDTreeRoot.path.getParent()