Added a flag for ignoring spaces

Added flag g:indent_guides_enable_on_vim_startup
Controls whether spaces are considered for indent calculating

Author: ryansouza

autoload/indent_guides.vim

@@ -46,7 +46,9 @@ function! indent_guides#enable()
     let l:hard_pattern = indent_guides#indent_highlight_pattern('\t', l:column_start, s:indent_size)
 
     " define the higlight patterns and add to matches list
-    call add(w:indent_guides_matches, matchadd(l:group, l:soft_pattern))
+    if g:indent_guides_space_guides
+      call add(w:indent_guides_matches, matchadd(l:group, l:soft_pattern))
+    end
     call add(w:indent_guides_matches, matchadd(l:group, l:hard_pattern))
   endfor
 endfunction

doc/indent_guides.txt

@@ -133,6 +133,14 @@ Default: 1. Values: between 1 and g:|indent_guides_indent_levels|.
   let g:indent_guides_start_level = 2
 <
 
+------------------------------------------------------------------------------
+                                                  *'indent_guides_space_guides'*
+Use this option to control whether the plugin considers spaces as indention.
+
+Default: 1. Values: 0 or 1.
+>
+  let g:indent_guides_space_guides = 0
+<
 ------------------------------------------------------------------------------
                                          *'indent_guides_enable_on_vim_startup'*
 Use this option to control whether the plugin is enabled on Vim startup.

plugin/indent_guides.vim

@@ -52,6 +52,7 @@ call s:InitVariable('g:indent_guides_guide_size',            0 )
 call s:InitVariable('g:indent_guides_start_level',           1 )
 call s:InitVariable('g:indent_guides_enable_on_vim_startup', 0 )
 call s:InitVariable('g:indent_guides_debug',                 0 )
+call s:InitVariable('g:indent_guides_space_guides',          1 )
 
 " Default mapping
 nmap <Leader>ig :IndentGuidesToggle<CR>