Move 'hlsearch' insert-mode suspension into plugin

It's easily repackaged and it makes the configuration that much shorter,
so I may as well. This version also correctly handles 'hlsearch' not
being on in the first place.

1 files changed, 48 insertions, 0 deletions

diff --git a/vim/plugin/insert_suspend_hlsearch.vim b/vim/plugin/insert_suspend_hlsearch.vim
new file mode 100644
index 00000000..378febc8
--- /dev/null
+++ b/vim/plugin/insert_suspend_hlsearch.vim
@@ -0,0 +1,48 @@
+"
+" insert_suspend_hlsearch.vim: If 'hlsearch' is enabled, switch it off when
+" the user starts an insert mode operation, and back on again when they're
+" done.
+"
+" Author: Tom Ryder <tom@sanctum.geek.nz>
+" License: Same as Vim itself
+"
+if exists('g:loaded_insert_suspend_hlsearch') || &compatible
+  finish
+endif
+" InsertEnter isn't an autocmd event until 7.0
+if !has('autocmd') || v:version < 700
+  finish
+endif
+let g:loaded_insert_suspend_hlsearch = 1
+
+" When entering insert mode, copy the current value of the 'hlsearch' option
+" into a script variable; if it's enabled, suspend it
+function s:InsertEnter()
+  let s:hlsearch = &hlsearch
+  echo &hlsearch
+  if s:hlsearch
+    set nohlsearch
+  endif
+  return
+endfunction
+
+" When leaving insert mode, if 'hlsearch' was enabled when this operation
+" started, restore it
+function s:InsertLeave()
+  if s:hlsearch
+    set hlsearch
+  endif
+  return
+endfunction
+
+" Clear search highlighting as soon as I enter insert mode, and restore it
+" once I leave it
+augroup insert_suspend_hlsearch
+  autocmd!
+  autocmd InsertEnter
+        \ *
+        \ call <SID>InsertEnter()
+  autocmd InsertLeave
+        \ *
+        \ call <SID>InsertLeave()
+augroup END