feat: support for broken symlinks.

lib/nerdtree/path.vim

@@ -62,7 +62,11 @@ function! s:Path.cacheDisplayString() abort
     endif
 
     if self.isSymLink
-        let self.cachedDisplayString = self.addDelimiter(self.cachedDisplayString) . ' -> ' . self.symLinkDest
+        let self.cachedDisplayString = self.addDelimiter(self.cachedDisplayString) . ' -> '
+        let self.cachedDisplayString = self.addDelimiter(self.cachedDisplayString) . self.symLinkDest
+        if self.isBroken
+            let self.cachedDisplayString = self.addDelimiter(self.cachedDisplayString) . g:NERDTreeGlyphBroken
+        endif
     endif
 
     if !self.isDirectory && b:NERDTree.ui.getShowFileLines() != 0
@@ -607,24 +611,33 @@ function! s:Path.readInfoFromDisk(fullpath)
 
     let fullpath = s:Path.WinToUnixPath(a:fullpath)
 
-    if getftype(fullpath) ==# 'fifo'
+    let ftype = getftype(fullpath)
+
+    if ftype ==# 'fifo'
         throw 'NERDTree.InvalidFiletypeError: Cant handle FIFO files: ' . a:fullpath
     endif
 
     let self.pathSegments = filter(split(fullpath, '/'), '!empty(v:val)')
 
-    let self.isReadOnly = 0
     if isdirectory(a:fullpath)
         let self.isDirectory = 1
+    let self.isReadOnly = 0
+    let self.isBroken = 0
     elseif filereadable(a:fullpath)
         let self.isDirectory = 0
         let self.isReadOnly = filewritable(a:fullpath) ==# 0
+    let self.isBroken = 0
+    elseif ftype ==# 'link'
+    let self.isDirectory = 0
+    let self.isReadOnly = 0
+    let self.isBroken = 1
     else
+    call nerdtree#echoWarning('invalid ' . a:fullpath . 'file type: ' . ftype)
         throw 'NERDTree.InvalidArgumentsError: Invalid path = ' . a:fullpath
     endif
 
     let self.isExecutable = 0
-    if !self.isDirectory
+    if !self.isDirectory && !self.isBroken
         let self.isExecutable = getfperm(a:fullpath) =~# 'x'
     endif
 

lib/nerdtree/tree_dir_node.vim

@@ -299,7 +299,7 @@ function! s:TreeDirNode._glob(pattern, all)
     " See ':h version7.txt' and ':h version8.txt' for details on the
     " development of the glob() and globpath() functions.
     if v:version > 704 || (v:version ==# 704 && has('patch654'))
-        let l:globList = globpath(l:pathSpec, a:pattern, !g:NERDTreeRespectWildIgnore, 1, 0)
+        let l:globList = globpath(l:pathSpec, a:pattern, !g:NERDTreeRespectWildIgnore, 1, 1)
     elseif v:version ==# 704 && has('patch279')
         let l:globList = globpath(l:pathSpec, a:pattern, !g:NERDTreeRespectWildIgnore, 1)
     elseif v:version > 702 || (v:version ==# 702 && has('patch051'))

plugin/NERD_tree.vim

@@ -71,6 +71,7 @@ let g:NERDTreeSortOrder    = get(g:, 'NERDTreeSortOrder', ['\/$', '*', '\.swp$',
 let g:NERDTreeOldSortOrder = []
 
 let g:NERDTreeGlyphReadOnly = get(g:, 'NERDTreeGlyphReadOnly', 'RO')
+let g:NERDTreeGlyphBroken = get(g:, 'NERDTreeGlyphBroken', ' [*broken]')
 
 if has('conceal')
     let g:NERDTreeNodeDelimiter = get(g:, 'NERDTreeNodeDelimiter', "\x07")