Window-specific keybindings in vim

window-specific-keybingings.vim

function! SetWindowMap(map)
  exe "noremap <silent> " . a:map . " :call ExecuteWindowMap('" . a:map . "')<CR>"
endfunction

function! ExecuteWindowMap(map)
  if exists("w:winMaps") && has_key(w:winMaps, a:map)
    call feedkeys(w:winMaps[a:map])
  else
    exe "unmap " . a:map 
    let escaped = escape(a:map, "<") "may cause unexpected behavior when mapping "<"
    silent call feedkeys(escaped)
    call SetWindowMap(a:map) 
  endif
endfunction 

"Usage:
":call WindowMap("<F2>", ":echo \"test\"<CR>")
function! WindowMap(map, cmd)
  if !exists("w:winMaps")
    let w:winMaps = {}
  endif
  let w:winMaps[a:map] = a:cmd
  call SetWindowMap(a:map)
endfunction