Issue #16112 has been updated by k0kubun (Takashi Kokubun).


This ticket was resolved with commit:15eaedf805fb2727c79a6c59af6d5f6c2a6d634b.

In addition to that, since it people have often objected to "expand tabs" against files which are not related to VM / MJIT (debugging MJIT needs to see preprocessed C code, and tab is converted to 1 space. So it's really helpful if MJIT-related code is space-indented), effectively guarding only MJIT-related files and some other files which were already indented consistently. 
Newly introducing tab indentation to files which were originally indented with only spaces would be clearly violating [Misc #14246], and it should be prohibited "so that we move in the direction of fewer tabs" like @jeremyevans said.

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Misc #16112: Reduce the possibility of "expand tabs" commit occurrences
https://bugs.ruby-lang.org/issues/16112#change-80917

* Author: k0kubun (Takashi Kokubun)
* Status: Closed
* Priority: Normal
* Assignee: 
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## Problem
* While we agreed to use only spaces for indentation of C code in [Bug #14246], we sometimes hit "expand tabs" commit when we just edit a part of existing lines with hard tab indentation.
* "expand tabs" commit bothers people when we need to perform a revert or a backport.
* However, because [Bug #14246] aimed to eventually make indentations consistent, we do not want to just drop "expand tabs".
  * One of the motivations to solve [Bug #14246] is that having hard tabs makes preprocessed MJIT header ugly and it makes debugging on GCC hard. As MJIT may introduce C-code inlining for sources outside vm.c in the future, we want to fix the issue in almost all C sources which can be run on runtime.

## Possible Solutions
There would be some options to approach the problem. I'd like to hear opinions about these options.

1. Expand all tabs at once for all files managed by auto-style.
  * In [Bug #14246], this was clearly objected for the reason "Indents should become consistent over time".
  * In my understanding, not folliwng "Indents should become consistent over time" would be problematic mainly for polluting "git blame" and conflicts on backport.
      * For the first point, we can use `-w` option of `git blame` to ignore that.
      * For backport, it's a trade-off with many "expand tabs" commits. We need opinions about this from @usa and @nagachika .
  * Also reverting a commit before the commit expanding all tabs would be bothering, for a short while.
2. Skip expand tabs for existing lines when indentation is not changed, and expand tabs only in newly-added lines.
  * If editors are configured properly, "expand tabs" would not happen for new patches in this approach.
  * Even in this approach, at least we will not go to the opposite direction of eventually achieving [Bug #14246]. So it seems acceptable.
3. Prepare a local pre-commit hook to expand tabs in newly-added or edited lines, and let people who do not want an "expand tabs" commit use it.
4. Make pull request CI fail when there's diff to be expanded, and let people who do not want "expand tabs" commit things from pull requests.

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