See [this stackoverflow question](https://stackoverflow.com/questions/803464/how-do-i-source-something-in-my-vimrc-file)

## Autocmd
Consider
```vim
:autocmd FileType python     :iabbrev <buffer> iff if:<left>
```
we want to source a file, so
```vim
:autocmd FileType html     :source ~/.vim/html.vim
```