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I've been using the fmt Unix tool to standardise line length, for example :%! fmt -999 (thanks to this answer).

I'd like to do this by default in Markdown files, so in ~/.vim/ftplugin/markdown.vim I tried:

au VimLeave <buffer> :%!fmt -9999 | w

But surprisingly when I leave I am stopped by a confirmation message, and my buffer has been overwritten by

22:39  up 14 days, 23:53, 3 users, load averages: 2.88 2.68 2.72
USER     TTY      FROM              LOGIN@  IDLE WHAT
joshfriedlander console  -                10Mar21 14days -
joshfriedlander s000     -                10Mar21 14days /Users/joshfriedlander/anacon
joshfriedlander s001     -                22:07       - w

However when I use an aucmd not related to leaving, such as

au InsertLeave <buffer> :%!fmt -9999

it works as expected.

What is going on here? How can I fix this?

2

The :! sees the bar as part of its argument (I forget the help-reference; edits appreciated).

So you have to write

execute '%!fmt -999' | write

The extra output is from the w program run by the shell, which is similar to who.

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