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I have a text file where I keep my personal notes. They're structured in a certain way, so I can operate on those notes with vim commands. I would like to map a keyboard shortcut to a specific set of commands, but that mapping should be available only in this file. So I tried writing a modeline at the end of my file, like this:

# vim: nmap \a A [a]<ESC>

Unfortunately, that didn't work: when opening the file, vim says

Error detected while processing modelines:
line  273:
E518: Unknown option: nmap

How do I set a mapping that only works in this file? Preferably without writing to .vimrc or another file. Also, my file doesn't have a filetype, it's just text, and the file doesn't have any extension.

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    You don't, modelines are run in a restricted sandbox. You can however set a filetype in a modeline, then add your map (with the <buffer> qualifier if you want, cf. :h :map-<buffer>) to a corresponding ftplugin file. The filetype can be a made-up name, it doesn't have to be a well-known type. – Sato Katsura Aug 10 '16 at 10:51
  • @SatoKatsura I was hoping it worked without a filetype, but defining one for my file inspires me to "think of the possibilities". Thank you. Please move your comment to an answer, I'll accept it. – CamilB Aug 10 '16 at 11:01
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Moving to answers, as requested.

Modelines are run in a restricted sandbox, there is only a limited number of things they can do, and defining keyboard maps is not among those.

You can however set a filetype in a modeline, then define a map in a corresponding ftplugin file. If you add the <buffer> qualifier the map will be defined only for the buffers of that filetype (cf. :h :map-<buffer>).

Also, the filetype doesn't have to be a "well-known" name, a made-up name would work just as well as a well-known one.

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