[vim] Add g:fzf_action for customizing key bindings

Close #189

README.md

@@ -276,34 +276,17 @@ If you have set up fzf for Vim, `:FZF` command will be added.
 
 " With options
 :FZF --no-sort -m /tmp
+
+" Bang version starts in fullscreen instead of using tmux pane or Neovim split
+:FZF!
 ```
 
 Similarly to [ctrlp.vim](https://github.com/kien/ctrlp.vim), use enter key,
 `CTRL-T`, `CTRL-X` or `CTRL-V` to open selected files in the current window,
 in new tabs, in horizontal splits, or in vertical splits respectively.
 
-Note that the environment variables `FZF_DEFAULT_COMMAND` and `FZF_DEFAULT_OPTS`
-also apply here.
-
-If you're on a tmux session or using Neovim, `:FZF` will launch fzf in a
-split-window whose height can be adjusted with `g:fzf_height` (default:
-'40%'). However, the bang version (`:FZF!`) will always start in fullscreen.
-
-In GVim, you need an external terminal emulator to start fzf with. `xterm`
-command is used by default, but you can customize it with `g:fzf_launcher`.
-
-```vim
-" This is the default. %s is replaced with fzf command
-let g:fzf_launcher = 'xterm -e bash -ic %s'
-
-" Use urxvt instead
-let g:fzf_launcher = 'urxvt -geometry 120x30 -e sh -c %s'
-```
-
-If you're running MacVim on OSX, I recommend you to use iTerm2 as the launcher.
-Refer to the [this wiki
-page](https://github.com/junegunn/fzf/wiki/On-MacVim-with-iTerm2) to see how
-to set up.
+Note that the environment variables `FZF_DEFAULT_COMMAND` and
+`FZF_DEFAULT_OPTS` also apply here.
 
 #### `fzf#run([options])`
 

plugin/fzf.vim

@@ -308,23 +308,26 @@ function! s:callback(dict, temps)
   return lines
 endfunction
 
+let s:default_action = {
+  \ 'ctrl-m': 'e',
+  \ 'ctrl-t': 'tabedit',
+  \ 'ctrl-x': 'split',
+  \ 'ctrl-v': 'vsplit' }
+
 function! s:cmd_callback(lines) abort
   if empty(a:lines)
     return
   endif
   let key = remove(a:lines, 0)
-  if     key == 'ctrl-t' | let cmd = 'tabedit'
-  elseif key == 'ctrl-x' | let cmd = 'split'
-  elseif key == 'ctrl-v' | let cmd = 'vsplit'
-  else                   | let cmd = 'e'
-  endif
+  let cmd = get(s:action, key, 'e')
   for item in a:lines
     execute cmd s:escape(item)
   endfor
 endfunction
 
 function! s:cmd(bang, ...) abort
-  let args = extend(['--expect=ctrl-t,ctrl-x,ctrl-v'], a:000)
+  let s:action = get(g:, 'fzf_action', s:default_action)
+  let args = extend(['--expect='.join(keys(s:action), ',')], a:000)
   let opts = {}
   if len(args) > 0 && isdirectory(expand(args[-1]))
     let opts.dir = remove(args, -1)