diffstat already has a -w option which can be used to achieve the same result.
Making it respond to the environment variable would change existing uses.
man diffstat
-w number
specify the maximum width of the histogram. The histogram will
never be shorter than 10 columns, just in case the filenames get
too large.
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diffstat does not honor COLUMNS environment variable
https://bugs.launchpad.net/bugs/209537
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