Vim: <leader> key sequences are interfused with normal mode mappings

I'm trying to define mappings for "cpp" filetype:

autocmd! FileType cpp map <leader>c echo "test c"

autocmd! FileType cpp m开发者_开发技巧ap <leader>r echo "test r"

autocmd! FileType cpp map <leader>t echo "test t"

My leader key is redefined:

let mapleader = ","

When I open *.cpp file only one of the mappings works as expected: the ",t" sequence makes the "echo" happen, but the other two behaves as if there were no any mappings defined: ",r" makes Vim to switch to replace mode and ",c" brings Vim to insert mode.

What am I doing wrong?

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I don't know how your example (including ,c one) could work: you forgot to prepend echo with a colon. But there is another mistake: according to the help:

:au[tocmd]! [group] {event} {pat} [nested] {cmd}

Remove all autocommands associated with {event} and {pat}, and add the command {cmd}.

So, the last one (,t) should replace all previous ones.

There are also another things you should to consider:

1. Don't use map, use noremap instead: it may once save you from doing a debug job after you add some mapping.
2. If you define filetype mapping you should normally add <buffer> as an argument to :noremap in a position before {lhs}: it will make this mapping local to the current buffer.

3. In case you want to re-source vimrc you should put all command into augroup:

   augroup VimrcCpp
       autocmd!
       autocmd FileType cpp nnoremap <buffer> <leader>c :echo "c"<CR>
       autocmd FileType cpp nnoremap <buffer> <leader>r :echo "r"<CR>
       autocmd FileType cpp nnoremap <buffer> <leader>t :echo "t"<CR>
   augroup END
   

4. I would have removed it from vimrc and added to ~/.vim/ftplugin/cpp.vim (after directory is to be used only to override options that you don't like if they are unconditionally defined by a plugin. If there are no mapping conflicts, don't use after).

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I suggest you put those mapping in a file called cpp.vim placed in your ~/.vim/after/ftplugin/ (or any equivalent based on OS) directory.

Vim automatically loads it as long as you have

filetype plugin on

in your .vimrc.

This saves you writing autocommands and keeps your configuration well organized.