[ruby-core:84498] [Ruby trunk Bug#14246] Inconsistent C source code indentation

Issue #14246 has been reported by shyouhei (Shyouhei Urabe).

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Bug #14246: Inconsistent C source code indentation
https://bugs.ruby-lang.org/issues/14246

* Author: shyouhei (Shyouhei Urabe)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN, 2.5: UNKNOWN
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I would like to focus on following 238 C source codes in our repository.

```
% git ls-files | grep '\.\(c\|h\|def\)$' | grep -v 'ext|spec|test' | wc -l
238
```

Here, in these 238 files, 10 files are indented using spaces only.

```
% git ls-files | command grep '\.\(c\|h\|def\)$' | grep -v 'ext|spec|test' | \
xargs grep --files-without-match $'^\t' | xargs grep --files-with-match '^        ' | wc -l
10
```

On the other hand 66 files are indented using tabs.

```
% git ls-files | command grep '\.\(c\|h\|def\)$' | grep -v 'ext|spec|test' | \
xargs grep --files-with-match $'^\t' | xargs grep --files-without-match '^        ' | wc -l
66
```

Other 61 files do not indent.  We should not bother them.

```
% git ls-files | command grep '\.\(c\|h\|def\)$' | grep -v 'ext|spec|test' | \
xargs grep --files-without-match $'^\t' | xargs grep --files-without-match '^        ' | wc -l
61
```

So far so good.  But what about remaining 101 files?  The answer is obvious; these files MIX indents.

```
% git ls-files | command grep '\.\(c\|h\|def\)$' | grep -v 'ext|spec|test' | \
xargs grep --files-with-match $'^\t' | xargs grep --files-with-match '^        ' | wc -l
101
```

This is totally wrong.  No matter should we use spaces or tabs for indentations, it must be consistent.



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