Merge pull request #833 from hav4ik/master

Fixed error 'unknown function strcharpart' for older versions of Vim

Author: PhilRunninger

lib/nerdtree/bookmark.vim

@@ -287,10 +287,14 @@ function! s:Bookmark.str()
 
     let pathStr = self.path.str({'format': 'UI'})
     if strdisplaywidth(pathStr) > pathStrMaxLen
-        while strdisplaywidth(pathStr) > pathStrMaxLen && strchars(pathStr) > 0
-            let pathStr = strcharpart(pathStr, 1)
-        endwhile
-        let pathStr = '<' . pathStr
+        if exists("*strcharpart")
+            while strdisplaywidth(pathStr) > pathStrMaxLen && strchars(pathStr) > 0
+                let pathStr = strcharpart(pathStr, 1)
+            endwhile
+            let pathStr = '<' . pathStr
+        else
+            let pathStr = '<' . strpart(pathStr, len(pathStr) - pathStrMaxLen)
+        endif
     endif
     return '>' . self.name . ' ' . pathStr
 endfunction

lib/nerdtree/path.vim

@@ -720,9 +720,13 @@ function! s:Path.str(...)
     if has_key(options, 'truncateTo')
         let limit = options['truncateTo']
         if strdisplaywidth(toReturn) > limit-1
-            while strdisplaywidth(toReturn) > limit-1 && strchars(toReturn) > 0
-                let toReturn = strcharpart(toReturn, 1)
-            endwhile
+            if exists("*strcharpart")
+                while strdisplaywidth(toReturn) > limit-1 && strchars(toReturn) > 0
+                    let toReturn = strcharpart(toReturn, 1)
+                endwhile
+            else
+                let toReturn = toReturn[(len(toReturn)-limit+1):]
+            endif
             if len(split(toReturn, '/')) > 1
                 let toReturn = '</' . join(split(toReturn, '/')[1:], '/') . '/'
             else