From 36673b255bb0b877063d0a3bb401930521d6b60b Mon Sep 17 00:00:00 2001
From: Tom McDonald <tommcdo@gmail.com>
Date: Sat, 14 Feb 2015 10:56:16 -0500
Subject: [PATCH] Allow toggling of exchange region highlighting

Closes #33
---
 plugin/exchange.vim | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/plugin/exchange.vim b/plugin/exchange.vim
index 8717ac1..c564ca2 100644
--- a/plugin/exchange.vim
+++ b/plugin/exchange.vim
@@ -1,3 +1,5 @@
+let s:enable_highlighting = 1
+
 function! s:exchange(x, y, reverse, expand)
 	let reg_z = s:save_reg('z')
 	let reg_unnamed = s:save_reg('"')
@@ -143,7 +145,7 @@ endfunction
 
 function! s:highlight_region(region)
 	let pattern = '\%'.a:region[0].'l\%'.a:region[1].'v\_.\{-}\%'.a:region[2].'l\(\%>'.a:region[3].'v\|$\)'
-	return matchadd('ExchangeRegion', pattern)
+	return matchadd('_exchange_region', pattern)
 endfunction
 
 function! s:highlight_clear(match)
@@ -152,6 +154,15 @@ function! s:highlight_clear(match)
 	endfor
 endfunction
 
+function! s:highlight_toggle(...)
+	if a:0 == 1
+		let s:enable_highlighting = a:1
+	else
+		let s:enable_highlighting = !s:enable_highlighting
+	endif
+	execute 'highlight link _exchange_region' (s:enable_highlighting ? 'ExchangeRegion' : 'None')
+endfunction
+
 " Return < 0 if x comes before y in buffer,
 "        = 0 if x and y overlap in buffer,
 "        > 0 if x comes after y in buffer
@@ -228,6 +239,10 @@ vnoremap <silent> <Plug>(Exchange) :<C-u>call <SID>exchange_set(visualmode(), 1)
 nnoremap <silent> <Plug>(ExchangeClear) :<C-u>call <SID>exchange_clear()<CR>
 nnoremap <silent> <Plug>(ExchangeLine) :<C-u>set opfunc=<SID>exchange_set<CR>g@_
 
+command! XchangeHighlightToggle call s:highlight_toggle()
+command! XchangeHighlightEnable call s:highlight_toggle(1)
+command! XchangeHighlightDisable call s:highlight_toggle(0)
+
 command! ExchangeClear call s:exchange_clear(1)
 command! XchangeClear call s:exchange_clear()