Vim bind some hotkeys different to filetype

I want to bind something like this:

• For CSS, HTM开发者_Go百科L files: <c-space> <c-x><c-n>

• For Ruby files: <c-space> <c-x><c-u>

How to do this?

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The documentation is more complete, precise and correct, but briefly:

Make a file in your ftplugin folder (create this folder if necessary) starting with the filetype you'd like to use.

├── vim
│   ├── after
│   ├── autoload
│   ├── bundle
│   ├── ftplugin
│   │   ├── python.vim
│   │   ├── rnoweb.vim
│   │   └── tex.vim
│   └── syntax

and in one of of these files, the python.vim one for example, a line like

noremap! <buffer> <F5> <Esc>:w<CR>:!python % <CR>

will be a bind only defined for this filetype, just in this buffer. Make sure filetype plugin on or similar appears in your vimrc.

Edit: excellent suggestions by Peter Rincker incorporated: noremap version of map command and <buffer> flag. He also reminds us to use setlocal instead of set in our filetype plugin files.

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Use autocmd:

autocmd filetype css inoremap <buffer> <c-space> <c-x><c-n>  
autocmd filetype html inoremap <buffer> <c-space> <c-x><c-n>
autocmd filetype ruby inoremap <buffer> <c-space> <c-x><c-u>

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Put the following in your .vimrc. Substitute the do stuff lines with your bindings.

:if match(@%, ".css") >=0 
: do css stuff
:endif

:if match(@%, ".rb") >=0 
: do ruby stuff
:endif