From 568f5a27627274fad4891e8307838ca55b468117 Mon Sep 17 00:00:00 2001
From: Jacob Merizian <jmerizia@vt.edu>
Date: Fri, 21 Jul 2017 05:07:04 -0400
Subject: [PATCH] Allows users to turn off preprocessor language parsing for
 better performance (#79)

* removed preprocessing langs from registration

I'm not sure if this will work

* add back support for pre-processors

adds back support for preprocessors, but keeps vim fast when not in use

* completely removed support for preprocessors

testing to see if completely removing preprocessor language registrations will make syntime reports more performant

* added back conditional support

conditional support should work now

* just testing remove all preprocessor support

* I think this will work

* i found the actual bug

some regex statements are being checked several times

* quick fix for now

I only apply a quick fix until I can get to the root of the problem. For this, in order to turn off the preprocessors which seem to bog down vim, just put `let g:avoid_pre_processors = 1` in the .vimrc (or neovim equivalent).

* forgot endif statement

* testing behavior

* removed line to test behavior

* Update readme.md

* Update readme.md

* Update vue.vim

* Update vue.vim

* Update readme.md
---
 readme.md      |  4 ++++
 syntax/vue.vim | 22 ++++++++++++----------
 2 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/readme.md b/readme.md
index 2de1ec7..2028f16 100644
--- a/readme.md
+++ b/readme.md
@@ -125,3 +125,7 @@ endfunction
 ```
 
 </details>
+
+### _Vim gets slows down when using this plugin_ How can I fix that?
+
+Add `let g:vue_disable_pre_processors=1` in your .vimrc to disable checking for prepocessors. When checking for prepocessor languages, multiple syntax highlighting checks are done, which can slow down vim. This variable prevents vim-vue from supporting **every** prepocessor language highlighting.
diff --git a/syntax/vue.vim b/syntax/vue.vim
index 046c338..71f82d5 100644
--- a/syntax/vue.vim
+++ b/syntax/vue.vim
@@ -40,16 +40,18 @@ function! s:register_language(language, tag, ...)
   endif
 endfunction
 
-call s:register_language('pug', 'template', s:attr('lang', '\%(pug\|jade\)'))
-call s:register_language('slm', 'template')
-call s:register_language('handlebars', 'template')
-call s:register_language('haml', 'template')
-call s:register_language('typescript', 'script', '\%(lang=\("\|''\)[^\1]*\(ts\|typescript\)[^\1]*\1\|ts\)')
-call s:register_language('coffee', 'script')
-call s:register_language('stylus', 'style')
-call s:register_language('sass', 'style')
-call s:register_language('scss', 'style')
-call s:register_language('less', 'style')
+if !exists("g:vue_disable_pre_processors") || !g:vue_disable_pre_processors
+  call s:register_language('pug', 'template', s:attr('lang', '\%(pug\|jade\)'))
+  call s:register_language('slm', 'template')
+  call s:register_language('handlebars', 'template')
+  call s:register_language('haml', 'template')
+  call s:register_language('typescript', 'script', '\%(lang=\("\|''\)[^\1]*\(ts\|typescript\)[^\1]*\1\|ts\)')
+  call s:register_language('coffee', 'script')
+  call s:register_language('stylus', 'style')
+  call s:register_language('sass', 'style')
+  call s:register_language('scss', 'style')
+  call s:register_language('less', 'style')
+endif
 
 syn region  vueSurroundingTag   contained start=+<\(script\|style\|template\)+ end=+>+ fold contains=htmlTagN,htmlString,htmlArg,htmlValue,htmlTagError,htmlEvent
 syn keyword htmlSpecialTagName  contained template