From 882ab357864842f7e61eaeb283611ed4b4470985 Mon Sep 17 00:00:00 2001
From: Hugues Hiegel <hugues.hiegel@qosmos.com>
Date: Thu, 18 Dec 2014 15:52:09 +0100
Subject: [focus] Color inactive windows (vim >= 7.3 ..)

---
 vimrc | 29 +++++++++++++++++++++++++++++
 1 file changed, 29 insertions(+)

diff --git a/vimrc b/vimrc
index e6e3886..5853196 100644
--- a/vimrc
+++ b/vimrc
@@ -76,6 +76,35 @@ set autowrite
 " default error format
 "set efm=\"%f\"\\,\ line\ %l:\ error\ %m,\"%f\"\\,\ line\ %l:\ warning\ %m
 
+" Dim inactive windows using 'colorcolumn' setting
+" This tends to slow down redrawing, but is very useful.
+" Based on https://groups.google.com/d/msg/vim_use/IJU-Vk-QLJE/xz4hjPjCRBUJ
+" XXX: this will only work with lines containing text (i.e. not '~')
+if v:version > 703
+function! s:DimInactiveWindows()
+  for i in range(1, tabpagewinnr(tabpagenr(), '$'))
+    let l:range = ""
+    if i != winnr()
+      if &wrap
+        " HACK: when wrapping lines is enabled, we use the maximum number
+        " of columns getting highlighted. This might get calculated by
+        " looking for the longest visible line and using a multiple of
+        " winwidth().
+        let l:width=256 " max
+      else
+        let l:width=winwidth(i)
+      endif
+      let l:range = join(range(1, l:width), ',')
+    endif
+    call setwinvar(i, '&colorcolumn', l:range)
+  endfor
+endfunction
+augroup DimInactiveWindows
+  au!
+  au WinEnter * call s:DimInactiveWindows()
+augroup END
+endif
+
 " remaps C-j & C-k to C-y and C-e (buffer up/down line-by-line)
 noremap <C-k> <C-y>
 noremap <C-j> <C-e>
-- 
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