Format with clang-format in future

[markuspg]

This pull request does not introduce any functional changes to the code. I just wanted to propose to format the code automatically with clang-format in future. For this reason I added a default .clang-format file and formatted the code accordingly.

I tried to create a clang-format configuration which was better suited to the currently existing codebase than the default one. But the handling of tabs proved to be very difficult, especially for continued function parameter lists.

I guess this pull request is not for merging directly, but rather for discussion.

If there is an automatic formatting in place already and I just overlooked it, this pull request can be rejected gladly.

PS: This is not about cheaply making me the "king of git blame". Any port to a newer GTK version or another toolkit should touch most lines anyhow and flush these changes down the Git history.

[TobiX]

Good idea - I think it would be fine to migrate to some "standard" style, even if that makes the diff a lot larger (would it?). You can always add a .git-blame-ignore-revs file later (see https://docs.github.com/en/repositories/working-with-files/using-files/viewing-a-file#ignore-commits-in-the-blame-view)

[markuspg]

The .clang-format I added is the default when calling clang-format --dump-config (i.e. the LLVM style). My manually adjusted one was much smaller. But the result was a bad compromise in any case, so I prefer going with the default of clang-format.

One change I conducted is creating the .clang-format file from clang-format 7 instead of clang-format 17. This maintains backwards compatibility down to Debian 10. Despite quite a few options not existing in the earlier version, the resulting formatting is identical no matter if clang-format 7 or clang-format 17 is being used with the .clang-format file.

Thank you for the hint for the .git-blame-ignore-revs file, that's a really neat feature. I added the file. Unfortunately I didn't find a way to have git blame pick it up automatically on any checkout. But at least the file exists as a hint at this feature.

[TobiX]

Unfortunately I didn't find a way to have git blame pick it up automatically on any checkout. But at least the file exists as a hint at this feature.

Yeah, it's unfortunate one can't just git config --global blame.ignoreRevsFile .git-blame-ignore-revs, because then git blame complains in repositories not containing this file. I built some automation in my own shell config, if yo need some inspiration: TobiX/dotfiles@9d1674c