Do not treat trailing # in gitignore as comment

[mcous]

Just started using knip today and it was instrumental in some really nice cleanup in our codebase. I hit #795 right off the bat, though, and it took me a while to figure out what was going on. I figured I could say "thanks" by opening up a quick PR to fix the issue!

The logic in the gitignore parser that strips trailing # ... off of .gitignore lines appears to be wrong. In my testing, you cannot add a comment to the end of a .gitignore line in this manner (syntax highlighting be damned):

# this is a comment
dist # this is not a comment

This tracks with git's documentation (emphasis mine) as well as my own messing around with git:

A line starting with # serves as a comment. Put a backslash (\) in front of the first hash for patterns that begin with a hash.

The previous parsing logic (added in e455527) stripped all non-backslashed #... out. I updated the logic to only strip a leading \, if it's in front of a hash, so the following cases will be handled properly:

trailing-hash-ignore#
\#leading-hash-ignore
just#some-file

[pkg-pr-new]

Open in Stackblitz

bun add https://pkg.pr.new/knip@797

commit: 9b72edb

[webpro]

Thanks @mcous! Very much appreciate you made the leap from "dang this thing doesn't work at all" to a PR with a fix with tests! Will be released shortly.

[webpro]

🚀 This pull request is included in v5.31.0. See Release 5.31.0 for release notes.

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