Maps default keys only when they are not already used

plugin/zeavim.vim

@@ -2,7 +2,7 @@
 " Global plugin that allows executing Zeal from Vim.
 " Version : 2.3.0
 " Creation : 2014-04-14
-" Last Change : 2018-03-12
+" Last Change : 2018-03-20
 " Maintainer : Kabbaj Amine <[email protected]>
 " License : This file is placed in the public domain.
 " ==========================================================
@@ -24,16 +24,24 @@ set cpoptions&vim
 " Default mappings {{{1
 if !exists('g:zv_disable_mapping')
  if !hasmapto('<Plug>Zeavim')
- nmap <unique> <Leader>z <Plug>Zeavim
+ if empty(mapcheck('<Leader>z'))
+ nmap <unique> <Leader>z <Plug>Zeavim
+ endif
  endif
  if !hasmapto('<Plug>ZVVisSelection')
- vmap <unique> <Leader>z <Plug>ZVVisSelection
+ if empty(mapcheck('<Leader>z', 'v'))
+ vmap <unique> <Leader>z <Plug>ZVVisSelection
+ endif
  endif
  if !hasmapto('<Plug>ZVKeyDocset')
- nmap <unique> <Leader><Leader>z <Plug>ZVKeyDocset
+ if empty(mapcheck('<Leader><Leader>z'))
+ nmap <unique> <Leader><Leader>z <Plug>ZVKeyDocset
+ endif
  endif
  if !hasmapto('<Plug>ZVOperator')
- nmap <unique> gz <Plug>ZVOperator
+ if empty(mapcheck('gz'))
+ nmap <unique> gz <Plug>ZVOperator
+ endif
  endif
 endif