fixed it:
echo ' -r, --recursive like --directories=recurse' | sed -ne
's/\([^-]\|-[^-]\)*\(--[-A-Za-z0-9]\{1,\}=\{0,1\}\).*/\2/p'
--recursive
using \([^-]\|-[^-]\)* instead of .* at the front of the pattern makes the
greedy match at the front stop at the first --. If there are commands that use
-- as formatting in their --help output, then this won't work, e.g.
-r -- equivalent to --recursive
but otherwise this should be good. It's pretty much standard to list the
actual options early in a line, rather than
like --directories=recurse -r, --recursive
This goes in _longopt(), line 1801 of bash_completion.
I'll submit this upstream, too
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https://bugs.launchpad.net/bugs/1167533
Title:
Completions for some long options are missing. (doesn't parse --help
output perfectly)
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