From 8c9518306db82be056263a9c847c1910cfe6930d Mon Sep 17 00:00:00 2001
From: Hugo Gualandi <hgualandi@inf.puc-rio.br>
Date: Sat, 5 Dec 2015 16:39:32 -0200
Subject: [PATCH] Do not remove whitespace that is preceeded by if backslash
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Trailing whitespace can be useful in .vimrc files if we want to set a
string property that ends in whitespace. For example:

    set showbreak=↪\ \ \

This change adds a "\\\@<!" at the start of every regex in the plugin
---
 plugin/trailing-whitespace.vim | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/plugin/trailing-whitespace.vim b/plugin/trailing-whitespace.vim
index d82d6c2..fc2a5c9 100644
--- a/plugin/trailing-whitespace.vim
+++ b/plugin/trailing-whitespace.vim
@@ -15,15 +15,15 @@ endfunction
 " Highlight EOL whitespace, http://vim.wikia.com/wiki/Highlight_unwanted_spaces
 highlight default ExtraWhitespace ctermbg=darkred guibg=#382424
 autocmd ColorScheme * highlight ExtraWhitespace ctermbg=red guibg=red
-autocmd BufRead * if ShouldMatchWhitespace() | match ExtraWhitespace /\s\+$/ | endif
+autocmd BufRead * if ShouldMatchWhitespace() | match ExtraWhitespace /\\\@<!\s\+$/ | endif
 
 " The above flashes annoyingly while typing, be calmer in insert mode
-autocmd InsertLeave * if ShouldMatchWhitespace() | match ExtraWhitespace /\s\+$/ | endif
-autocmd InsertEnter * if ShouldMatchWhitespace() | match ExtraWhitespace /\s\+\%#\@<!$/ | endif
+autocmd InsertLeave * if ShouldMatchWhitespace() | match ExtraWhitespace /\\\@<!\s\+$/ | endif
+autocmd InsertEnter * if ShouldMatchWhitespace() | match ExtraWhitespace /\\\@<!\s\+\%#\@<!$/ | endif
 
 function! s:FixWhitespace(line1,line2)
     let l:save_cursor = getpos(".")
-    silent! execute ':' . a:line1 . ',' . a:line2 . 's/\s\+$//'
+    silent! execute ':' . a:line1 . ',' . a:line2 . 's/\\\@<!\s\+$//'
     call setpos('.', l:save_cursor)
 endfunction