support incsearch

Author: ZSaberLv0

plugin/incsearch.vim

@@ -2,12 +2,13 @@
 if !get(g:, 'eregex_incsearch_enable', 1)
             \ || !exists('##CmdlineChanged')
             \ || !exists('##CmdlineLeave')
+            \ || !has('timers')
     finish
 endif
 
 augroup eregex_incsearch_augroup
     autocmd!
-    autocmd CmdlineChanged * call s:onUpdate()
+    autocmd CmdlineChanged * call s:delayUpdate()
     autocmd CmdlineLeave * call s:onLeave()
 augroup END
 
@@ -19,6 +20,25 @@ if !has('nvim')
     cnoremap <expr> <cr> K_eregex_incsearch_abort_cr()
 endif
 
+" it's buggy if update immediately on #CmdlineChanged,
+" especially for keymap such as
+"     nnoremap xxx :S/<c-r><c-w>
+function! s:delayUpdate()
+    if get(s:, 'delayUpdateId', -1) == -1
+        let s:delayUpdateId = timer_start(10, function('s:delayUpdateAction'))
+    endif
+endfunction
+function! s:delayUpdateCancel()
+    if get(s:, 'delayUpdateId', -1) != -1
+        call timer_stop(s:delayUpdateId)
+        let s:delayUpdateId = -1
+    endif
+endfunction
+function! s:delayUpdateAction(...)
+    let s:delayUpdateId = -1
+    call s:onUpdate()
+endfunction
+
 function! s:onUpdate()
     if getcmdtype() != ':'
                 \ || !get(b:, 'eregex_incsearch', get(g:, 'eregex_incsearch', &incsearch))
@@ -73,6 +93,8 @@ function! s:onUpdate()
 endfunction
 
 function! s:onLeave()
+    call s:delayUpdateCancel()
+
     if exists('s:hlsearchSaved')
         let hlsearchSaved = s:hlsearchSaved
         unlet s:hlsearchSaved