Vim key mapping mismatch

Question

I have code in ruby ​​and python using vim, and mine vimrchas a parameter to easily enter breakpoints:

au FileType python  map <silent> <leader>b oimport ipdb; ipdb.set_trace()<esc>
au FileType python  map <silent> <leader>B Oimport ipdb; ipdb.set_trace()<esc>
au FileType ruby    map <silent> <leader>b orequire 'pry'; binding.pry<esc>
au FileType ruby    map <silent> <leader>B Orequire 'pry'; binding.pry<esc>

However, sometimes I get the wrong command, for example. ipdbin the ruby ​​file, and I have to restart vim. What could be the problem?

Answer 1

The problem is that you define your mappings globally.

The solution is simple: add an argument <buffer>to your mappings to make them "buffer-local".

au FileType python  map <buffer> <silent> <leader>b oimport ipdb; ipdb.set_trace()<esc>
au FileType python  map <buffer> <silent> <leader>B Oimport ipdb; ipdb.set_trace()<esc>
au FileType ruby    map <buffer> <silent> <leader>b orequire 'pry'; binding.pry<esc>
au FileType ruby    map <buffer> <silent> <leader>B Orequire 'pry'; binding.pry<esc>

See :help <buffer>.

also:

• You should use :nmapor :nnoremapinstead :map. Prefer :nnoremap.

• autocommand reset, vimrc:

  augroup python
      autocmd!
      autocmd FileType python nnoremap <buffer> <silent> <leader>b oimport ipdb; ipdb.set_trace()<esc>
      autocmd FileType python nnoremap <buffer> <silent> <leader>B Oimport ipdb; ipdb.set_trace()<esc>
  augroup END
  
  augroup ruby
      autocmd!
      autocmd FileType ruby nnoremap <buffer> <silent> <leader>b orequire 'pry'; binding.pry<esc>
      autocmd FileType ruby nnoremap <buffer> <silent> <leader>B Orequire 'pry'; binding.pry<esc>
  augroup END