Add option to limit or disable default file extensions hilight

Author: tiagofumo

README.md

@@ -70,16 +70,31 @@ let g:NERDTreeExactMatchHighlightColor = {} " this line is needed to avoid error
 let g:NERDTreeExactMatchHighlightColor['.gitignore'] = s:git_orange " sets the color for .gitignore files
 
 let g:NERDTreePatternMatchHighlightColor = {} " this line is needed to avoid error
-let g:NERDTreePatternMatchHighlightColor['.*_spec\.rb$'] = s:rspec_red " sets the color files ending with _spec.rb
+let g:NERDTreePatternMatchHighlightColor['.*_spec\.rb$'] = s:rspec_red " sets the color for files ending with _spec.rb
 
 ```
 
 * Disable Highlight for specific file extension
 ```vim
+" If you have vim-devicons you can customize your icons for each file type.
 let g:NERDTreeExtensionHighlightColor = {} "this line is needed to avoid error
 let g:NERDTreeExtensionHighlightColor['css'] = '' "assigning it to an empty string will skip highlight
 ```
 
-Obs: If you have [vim-devicons](https://github.com/ryanoasis/vim-devicons) and you want to customize icons you can customize your icons for each file type.
+
+
+* Disable uncommon file extensions highlighting (this is a good idea if you are experiencing lag when scrolling)
+```vim
+let g:NERDTreeLimitedSyntax = 1
+```
+* Disable all default file extensions highlighting (you can use this to easily customize which extensions you want to highlight)
+```vim
+let g:NERDTreeSyntaxDisableDefaultExtensions = 1
+```
+* Customize which file extensions are enabled (you only need this if you set `g:NERDTreeLimitedSyntax` or `g:NERDTreeSyntaxDisableDefaultExtensions`)
+```vim
+" set g:NERDTreeExtensionHighlightColor if you want a custom color instead of the default one
+let g:NERDTreeSyntaxEnabledExtensions = ['hbs', 'lhs'] " enable highlight to .hbs and .lhs files with default colors
+```
 ### generate_files.sh script
 There is a script folder called generate_files.sh that will generate all the files supported by this plugin by default for a quick review. These files will be generated on a 'files' subfolder.

after/syntax/nerdtree.vim

@@ -341,28 +341,30 @@ let s:file_node_pattern_matches = {
 \}
 
 let s:enabled_extensions = [
-  \ 'bat',
   \ 'bmp',
   \ 'c',
-  \ 'c',
   \ 'coffee',
   \ 'cpp',
   \ 'css',
   \ 'erb',
   \ 'go',
+  \ 'hs',
   \ 'html',
   \ 'java',
   \ 'jpg',
   \ 'js',
   \ 'json',
   \ 'jsx',
+  \ 'less',
   \ 'lua',
   \ 'markdown',
   \ 'md',
   \ 'php',
   \ 'png',
+  \ 'pl',
   \ 'py',
   \ 'rb',
+  \ 'rs',
   \ 'scala',
   \ 'scss',
   \ 'sh',
@@ -374,9 +376,11 @@ if !exists('g:NERDTreeSyntaxEnabledExtensions')
   let g:NERDTreeSyntaxEnabledExtensions = []
 endif
 
-for extension in s:enabled_extensions
-  call add(g:NERDTreeSyntaxEnabledExtensions, extension)
-endfor
+if exists('g:NERDTreeLimitedSyntax') && !exists('g:NERDTreeSyntaxDisableDefaultExtensions')
+  for extension in s:enabled_extensions
+    call add(g:NERDTreeSyntaxEnabledExtensions, extension)
+  endfor
+endif
 
 let s:characters = '[a-zA-Z0-9_\#\-\+\*\%\!\~\(\)\{\}\&\.\$\@]'
 
@@ -387,13 +391,15 @@ if !exists('g:NERDTreeExtensionHighlightColor')
 endif
 
 for [key, val] in items(s:file_extension_colors)
-  if !has_key(g:NERDTreeExtensionHighlightColor , key) &&
-      \ (!exists('g:NERDTreeLimitedSyntax') ||
-      \ index(g:NERDTreeSyntaxEnabledExtensions, key) >= 0)
+  if ((exists('g:NERDTreeLimitedSyntax') ||
+        \ exists('g:NERDTreeSyntaxDisableDefaultExtensions')) ?
+        \ index(g:NERDTreeSyntaxEnabledExtensions, key) >= 0 :
+        \ !has_key(g:NERDTreeExtensionHighlightColor, key))
     let g:NERDTreeExtensionHighlightColor[key] = val
   endif
 endfor
 
+
 for [key, val] in items(g:NERDTreeExtensionHighlightColor)
   let label_identifier = 'nerdtreeFileExtensionLabel_'.key
   let icon_identifier = 'nerdtreeFileExtensionIcon_'.key