Updated the help file to reflect the latest changes

autoload/indent_guides.vim

@@ -82,22 +82,21 @@ function! indent_guides#highlight_colors()
     if has('gui_running')
       call indent_guides#gui_highlight_colors()
     else
-      call indent_guides#cterm_highlight_colors()
+      call indent_guides#basic_highlight_colors()
     endif
   endif
 endfunction
 
 "
-" Defines the indent highlight colors for terminal vim.
+" Defines some basic indent highlight colors that work for Terminal Vim and
+" gVim when colors can't be automatically calculated.
 "
-" NOTE: This function contains no magic at the moment, it will simply use some
-" light or dark preset colors depending on the `set background=` value.
-"
-function! indent_guides#cterm_highlight_colors()
-  let l:colors = (&g:background == 'dark') ? ['darkgrey', 'black'] : ['lightgrey', 'white']
+function! indent_guides#basic_highlight_colors()
+  let l:cterm_colors = (&g:background == 'dark') ? ['darkgrey', 'black'] : ['lightgrey', 'white']
+  let l:gui_colors   = (&g:background == 'dark') ? ['grey15', 'grey30']  : ['grey70', 'grey85']
 
-  exe 'hi IndentGuidesEven ctermbg=' . l:colors[0]
-  exe 'hi IndentGuidesOdd  ctermbg=' . l:colors[1]
+  exe 'hi IndentGuidesEven guibg=' . l:gui_colors[0] . ' ctermbg=' . l:cterm_colors[0]
+  exe 'hi IndentGuidesOdd  guibg=' . l:gui_colors[1] . ' ctermbg=' . l:cterm_colors[1]
 endfunction
 
 "
@@ -116,6 +115,10 @@ function! indent_guides#gui_highlight_colors()
     " color name is being used, eg. 'white'
     let l:color_name = matchstr(s:hi_normal, s:color_name_bg_pat)
     let l:hi_normal_guibg = color_helper#color_name_to_hex(l:color_name)
+
+  else
+    " background color could not be detected, default to basic colors
+    call indent_guides#basic_highlight_colors()
   endif
 
   if l:hi_normal_guibg =~ s:color_hex_pat

doc/indent_guides.txt

@@ -9,8 +9,8 @@
 
 
 Author:      Nate Kane <nathanaelkane AT gmail DOT com>
-Version:     1.2
-Last Change: 10 Jan 2011
+Version:     1.3
+Last Change: 17 Jan 2011
 
 ==============================================================================
 CONTENTS                                                *indent-guides-contents*
@@ -95,9 +95,9 @@ in an autocmd.
 Use this option to control the percent at which the highlight colors will be
 lightened or darkened.
 
-Default: 5 (5%). Values: between 0 and 100.
+Default: 10 (10%). Values: between 0 and 100.
 >
-  let g:indent_guides_color_change_percent = 5
+  let g:indent_guides_color_change_percent = 10
 <
 
 ------------------------------------------------------------------------------
@@ -203,10 +203,16 @@ Bug reports, feedback, suggestions etc are welcomed.
 ==============================================================================
 7. CHANGELOG                                           *indent-guides-changelog*
 
+1.3~
+  * Changed the default value of g:|indent_guides_color_change_percent| to 10.
+  * Added support for gVim themes that don't specify a `hi Normal guibg`
+    color.
+
 1.2~
   * Customizable size for indent guides, eg. skinny guides (soft-tabs only).
   * Customizable start indent level.
   * Refactored some internal logic.
+
 1.1~
   * Added basic support for Terminal Vim. See |indent-guides-terminal-vim| for
     more information.
@@ -223,7 +229,7 @@ Bug reports, feedback, suggestions etc are welcomed.
 The MIT Licence
 http://www.opensource.org/licenses/mit-license.php
 
-Copyright (c) 2010 Nate Kane
+Copyright (c) 2010-2011 Nate Kane
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

plugin/indent_guides.vim

@@ -47,7 +47,7 @@ let g:indent_guides_color_name_guibg_pattern = "guibg='\\?\\zs[0-9A-Za-z ]\\+\\z
 " Configurable global variables
 call s:InitVariable('g:indent_guides_indent_levels',        30)
 call s:InitVariable('g:indent_guides_auto_colors',          1 )
-call s:InitVariable('g:indent_guides_color_change_percent', 5 ) " ie. 5%
+call s:InitVariable('g:indent_guides_color_change_percent', 10) " ie. 10%
 call s:InitVariable('g:indent_guides_guide_size',           0 )
 call s:InitVariable('g:indent_guides_start_level',          1 )
 call s:InitVariable('g:indent_guides_debug',                0 )