Allow excluding files from highlight with '*' (#11)

Fixes GH-5

3 files changed, 28 insertions, 6 deletions

diff --git a/README.md b/README.md
index 2cb28b3..cf25c87 100644
--- a/README.md
+++ b/README.md
@@ -64,7 +64,7 @@ require 'colorizer'.setup {
   'css';
   'javascript';
   html = {
-	  mode = 'foreground';
+    mode = 'foreground';
   }
 }
 
@@ -83,7 +83,14 @@ require 'colorizer'.setup({
 require 'colorizer'.setup {
   '*'; -- Highlight all files, but customize some others.
   css = { rgb_fn = true; }; -- Enable parsing rgb(...) functions in css.
-  html = { no_names = true; } -- Disable parsing "names" like Blue or Gray
+  html = { names = false; } -- Disable parsing "names" like Blue or Gray
+}
+
+-- Exclude some filetypes from highlighting by using `!`
+require 'colorizer'.setup {
+  '*'; -- Highlight all files, but customize some others.
+  '!vim'; -- Exclude vim from highlighting.
+  -- Exclusion Only makes sense if '*' is specified!
 }
 ```
 
diff --git a/doc/colorizer-lua.txt b/doc/colorizer-lua.txt
index 2d27d27..9f2afda 100644
--- a/doc/colorizer-lua.txt
+++ b/doc/colorizer-lua.txt
@@ -91,7 +91,7 @@ PARAMETERS:
     'css';
     'javascript';
     html = {
-  	  mode = 'foreground';
+      mode = 'foreground';
     }
   }
   
@@ -112,6 +112,13 @@ PARAMETERS:
     css = { rgb_fn = true; }; -- Enable parsing rgb(...) functions in css.
     html = { names = false; } -- Disable parsing "names" like Blue or Gray
   }
+  
+  -- Exclude some filetypes from highlighting by using `!`
+  require 'colorizer'.setup {
+    '*'; -- Highlight all files, but customize some others.
+    '!vim'; -- Exclude vim from highlighting.
+    -- Exclusion Only makes sense if '*' is specified!
+  }
 <
 
 |colorizer.highlight_buffer|                          *colorizer.highlight_buffer*
diff --git a/lua/colorizer.lua b/lua/colorizer.lua
index b869897..32717e5 100644
--- a/lua/colorizer.lua
+++ b/lua/colorizer.lua
@@ -292,6 +292,9 @@ local function setup(filetypes, default_options)
 	default_options = SETUP_SETTINGS.default_options
 	function COLORIZER_SETUP_HOOK()
 		local filetype = nvim.bo.filetype
+		if SETUP_SETTINGS.exclusions[filetype] then
+			return
+		end
 		local options = FILETYPE_OPTIONS[filetype] or SETUP_SETTINGS.default_options
 		attach_to_buffer(nvim_get_current_buf(), options)
 	end
@@ -315,9 +318,14 @@ local function setup(filetypes, default_options)
 			else
 				filetype = v
 			end
-			FILETYPE_OPTIONS[filetype] = options
-			-- TODO What's the right mode for this? BufEnter?
-			nvim.ex.autocmd("FileType", filetype, "lua COLORIZER_SETUP_HOOK()")
+			-- Exclude
+			if filetype:sub(1,1) == '!' then
+				SETUP_SETTINGS.exclusions[filetype:sub(2)] = true
+			else
+				FILETYPE_OPTIONS[filetype] = options
+				-- TODO What's the right mode for this? BufEnter?
+				nvim.ex.autocmd("FileType", filetype, "lua COLORIZER_SETUP_HOOK()")
+			end
 		end
 	end
 	nvim.ex.augroup("END")