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learnvimscriptthehardway / chapters / 13.markdown

Buffer-Local Abbreviations

That last chapter was a monster, so let's tackle something easier. We've seen how to define buffer-local mappings and options, so let's apply the same idea to abbreviations.

Open your foo and bar files again, switch to foo, and run the following command:

:iabbrev <buffer> --- &mdash;

While still in foo enter insert mode and type the following text:

Hello --- world.

Vim will replace the --- for you. Now switch to bar and try it. It should be no surprise that it's not replaced, because we defined the abbreviation to be local to the foo buffer.

Autocommands and Abbreviations

Let's pair up these buffer-local abbreviations with autocommands to set them to make ourselves a little "snippet" system.

Run the following commands:

:autocmd FileType python     :iabbrev <buffer> iff if:<left>
:autocmd FileType javascript :iabbrev <buffer> iff if ()<left>

Open a Javascript file and try out the iff abbreviation. Then open a Python file and try it there too. Vim will perform the appropriate abbreviation depending on the type of the current file.

Exercises

Create a few more "snippet" abbreviations for some of the things you type often in specific kinds of files. Some good candidates are return for most languages, function for javascript, and things like &ldquo; and &rdquo; for HTML files.

Add these snippets to your ~/.vimrc file.

Remember: the best way to learn to use these new snippets is to disable the old way of doing things. Running :iabbrev <buffer> return NOPENOPENOPE will force you to use your abbreviation instead. Add these "training" snippets to match all the ones you created to save time.