Search code examples
vimkeymapping

Change the mapping of F5 on the basis of specific file type

The current mapping of my F5 key is:

imap <F5> <esc>:w\|!python %<CR>

Now I want that if I'm editing any python file (it will be better if it also recognizes file other than standard .py format like .pyd etc) then this mapping works as it is. But, if I edit a Java file it is mapped to something like:

imap <F5> <esc>:w\|!javac %<CR>

And when I'm editing any .c or .cpp file then F5 is mapped to this:

imap <F5> <esc>:w\|!make %<CR>

I have no idea how to proceed.

Solution

  • There are problems with both given answer and original mapping. First of all, for buffer-local mappings there is *map <buffer>. Second, with <buffer> you don’t need to use BufEnter events and can instead use Filetype which are launched only once. Third, you have one error (2.), one potential problem (1.) and one place that can be optimized in original mappings:

    1. you should not be using imap, it makes it very easy to accidentally break old mappings when adding new ones
    2. !python % will break once file contain a special symbol (space, semicolon, quot, dollar, …)
    3. using :update instead of :write avoids useless writes in some cases

    My variant:

    autocmd Filetype c,cpp  inoremap <buffer> <F5> <C-o>:update<Bar>execute '!make '.shellescape(expand('%:r'), 1)<CR>
autocmd Filetype python inoremap <buffer> <F5> <C-o>:update<Bar>execute '!python '.shellescape(@%, 1)<CR>
autocmd Filetype java   inoremap <buffer> <F5> <C-o>:update<Bar>execute '!javac '.shellescape(@%, 1)<CR>