Read the color pairs in top to bottom order, instead of prior complicated manner

autoload/rainbow_parentheses.vim

@@ -4,28 +4,22 @@
 "               2011-10-12: Use less code.  Leave room for deeper levels.
 "==============================================================================
 
-let s:pairs = [
-	\ ['brown',       'RoyalBlue3'],
-	\ ['Darkblue',    'SeaGreen3'],
-	\ ['darkgray',    'DarkOrchid3'],
-	\ ['darkgreen',   'firebrick3'],
-	\ ['darkcyan',    'RoyalBlue3'],
-	\ ['darkred',     'SeaGreen3'],
-	\ ['darkmagenta', 'DarkOrchid3'],
-	\ ['brown',       'firebrick3'],
-	\ ['gray',        'RoyalBlue3'],
-	\ ['black',       'SeaGreen3'],
-	\ ['darkmagenta', 'DarkOrchid3'],
-	\ ['Darkblue',    'firebrick3'],
-	\ ['darkgreen',   'RoyalBlue3'],
-	\ ['darkcyan',    'SeaGreen3'],
-	\ ['darkred',     'DarkOrchid3'],
+let s:rpairs= [
+	\ ['red',         'RoyalBlue3'],
+	\ ['brown',       'SeaGreen3'],
+	\ ['blue',        'DarkOrchid3'],
+	\ ['gray',        'firebrick3'],
+	\ ['green',       'RoyalBlue3'],
+	\ ['magenta',     'SeaGreen3'],
+	\ ['cyan',        'DarkOrchid3'],
+	\ ['darkred',     'firebrick3'],
 	\ ['red',         'firebrick3'],
 	\ ]
-let s:pairs = exists('g:rbpt_colorpairs') ? g:rbpt_colorpairs : s:pairs
-let s:max = exists('g:rbpt_max') ? g:rbpt_max : max([len(s:pairs), 16])
+let s:pairs = exists('g:rbpt_colorpairs') ? reverse(g:rbpt_colorpairs) : reverse(s:rpairs)
+let s:max = exists('g:rbpt_max') ? g:rbpt_max : max([len(s:pairs), 15])
 let s:loadtgl = exists('g:rbpt_loadcmd_toggle') ? g:rbpt_loadcmd_toggle : 0
 let s:types = [['(',')'],['\[','\]'],['{','}'],['<','>']]
+let s:bold = exists('g:bold_parentheses') ? g:bold_parentheses : 1
 
 func! s:extend()
 	if s:max > len(s:pairs)
@@ -39,8 +33,9 @@ cal s:extend()
 
 func! rainbow_parentheses#activate()
 	let [id, s:active] = [1, 1]
+	let bold = s:bold ? ' cterm=bold gui=bold' : ''
 	for [ctermfg, guifg] in s:pairs
-		exe 'hi default level'.id.'c ctermfg='.ctermfg.' guifg='.guifg
+		exe 'hi default level'.id.'c ctermfg='.ctermfg.' guifg='.guifg.bold
 		let id += 1
 	endfor
 endfunc
@@ -89,7 +84,7 @@ func! rainbow_parentheses#load(...)
 	for each in range(1, s:max)
 		let region = 'level'. each .(b:loaded[a:1] ? '' : 'none')
 		let grp = b:loaded[a:1] ? 'level'.each.'c' : 'Normal'
-		let cmd = 'sy region %s matchgroup=%s start=/%s/ end=/%s/ contains=TOP,%s,NoInParens'
+		let cmd = 'sy region %s matchgroup=%s start=/%s/ end=/%s/ contains=TOP,%s,NoInParens fold'
 		exe printf(cmd, region, grp, type[0], type[1], join(alllvls, ','))
 		cal remove(alllvls, 0)
 	endfor

readme.md

@@ -1,36 +1,48 @@
 # Better Rainbow Parentheses
 
+Forked from https://github.com/kien/rainbow_parentheses.vim since that now
+appears to be unmaintained.
+
 ### Options:
 
+The colours used; the outermost pair is coloured with the last colour in the
+list, the next-outermost with the second-last colour, etc. The first element of
+each entry is the terminal colour, the second element is the GUI (gvim) colour.
 ```vim
 let g:rbpt_colorpairs = [
+    \ ['red',         'RoyalBlue3'],
+    \ ['brown',       'SeaGreen3'],
+    \ ['blue',        'DarkOrchid3'],
+    \ ['gray',        'firebrick3'],
+    \ ['green',       'RoyalBlue3'],
+    \ ['magenta',     'SeaGreen3'],
+    \ ['cyan',        'DarkOrchid3'],
+    \ ['darkred',     'firebrick3'],
     \ ['brown',       'RoyalBlue3'],
-    \ ['Darkblue',    'SeaGreen3'],
-    \ ['darkgray',    'DarkOrchid3'],
-    \ ['darkgreen',   'firebrick3'],
-    \ ['darkcyan',    'RoyalBlue3'],
-    \ ['darkred',     'SeaGreen3'],
-    \ ['darkmagenta', 'DarkOrchid3'],
-    \ ['brown',       'firebrick3'],
-    \ ['gray',        'RoyalBlue3'],
-    \ ['black',       'SeaGreen3'],
-    \ ['darkmagenta', 'DarkOrchid3'],
-    \ ['Darkblue',    'firebrick3'],
+    \ ['darkblue',    'DarkOrchid3'],
+    \ ['gray',        'firebrick3'],
     \ ['darkgreen',   'RoyalBlue3'],
-    \ ['darkcyan',    'SeaGreen3'],
-    \ ['darkred',     'DarkOrchid3'],
+    \ ['darkmagenta', 'SeaGreen3'],
+    \ ['darkcyan',    'DarkOrchid3'],
     \ ['red',         'firebrick3'],
     \ ]
 ```
 
+How deep to colour (repeating the colour list if necessary) before giving up;
+limited for performance reasons.
 ```vim
-let g:rbpt_max = 16
+let g:rbpt_max = 15
 ```
 
 ```vim
 let g:rbpt_loadcmd_toggle = 0
 ```
 
+Also bold parenthese to make the colours stand out more.
+```vim
+let g:bold_parentheses = 1      " Default on
+```
+
 ### Commands:
 
 ```vim