ci: add pre-commit

[xqm32]

No description provided.

[zyr17]

Thanks! The first two commit adds pre-commit hook, and last commit fixed all format problems in current codes, am I right?

What I need to do is, installing pre-commit with pip, then write codes as usual, and when I create a new commit, new codes will be automatically formatted?

[xqm32]

Thanks! The first two commit adds pre-commit hook, and last commit fixed all format problems in current codes, am I right?

What I need to do is, installing pre-commit with pip, then write codes as usual, and when I create a new commit, new codes will be automatically formatted?

Yes! These things are almost transparent to you, except for the first installation of pre-commit. You can also use pre-commit run -a to manually run the pre-commit hook (just like run a makefile task).

New commit will be automatically formatted before commit, but the local pre-commit hook will only detect the changed files and the pre-commit Actions will run hook on all files, so we may also need to run pre-commit run -a manually. My third commit is to do so.

[xqm32]

Fixes: #54