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[k0kubun]

[Misc #18891]

The code I used to generate this diff

Because ruby-commit-hook's bin/auto-style.rb knows what kind of files should be skipped, I wrote this code based off of auto-style.rb.

DEFAULT_GEM_LIBS = %w[
  bundler
  cmath
  csv
  e2mmap
  fileutils
  forwardable
  ipaddr
  irb
  logger
  matrix
  mutex_m
  ostruct
  prime
  rdoc
  rexml
  rss
  scanf
  shell
  sync
  thwait
  tracer
  webrick
]

DEFAULT_GEM_EXTS = %w[
  bigdecimal
  date
  dbm
  etc
  fcntl
  fiddle
  gdbm
  io/console
  json
  openssl
  psych
  racc
  sdbm
  stringio
  strscan
  zlib
]

IGNORED_FILES = [
  # default gems whose master is GitHub
  %r{\Abin/(?!erb)\w+\z},
  *(DEFAULT_GEM_LIBS + DEFAULT_GEM_EXTS).flat_map { |lib|
    [
      %r{\Alib/#{lib}/},
      %r{\Alib/#{lib}\.gemspec\z},
      %r{\Alib/#{lib}\.rb\z},
      %r{\Atest/#{lib}/},
    ]
  },
  *DEFAULT_GEM_EXTS.flat_map { |ext|
    [
      %r{\Aext/#{ext}/},
      %r{\Atest/#{ext}/},
    ]
  },

  # vendoring (ccan)
  %r{\Accan/},

  # vendoring (nkf)
  %r{\Aext/nkf/nkf-utf8/},

  # vendoring (onigmo)
  %r{\Aenc/},
  %r{\Ainclude/ruby/onigmo\.h\z},
  %r{\Areg.+\.(c|h)\z},

  # explicit or implicit `c-file-style: "linux"`
  %r{\Aaddr2line\.c\z},
  %r{\Amissing/},
  %r{\Astrftime\.c\z},
  %r{\Avsnprintf\.c\z},

  # to respect the original statements of licenses
  %r{\ALEGAL\z},
]

paths = `git ls-files`.split(/\n/)
paths.select! do |l|
  /^\d/ !~ l and /\.bat\z/ !~ l and
  (/\A(?:config|[Mm]akefile|GNUmakefile|README)/ =~ File.basename(l) or
   /\A\z|\.(?:[chsy]|\d+|e?rb|tmpl|bas[eh]|z?sh|in|ma?k|def|src|trans|rdoc|ja|en|el|sed|awk|p[ly]|scm|mspec|html|)\z/ =~ File.extname(l))
end
files = paths.select {|n| File.file?(n) }
files.reject! do |f|
  IGNORED_FILES.any? { |re| f.match(re) }
end
files.select! do |f|
  f.end_with?('.c') || f.end_with?('.h') || f == 'insns.def' || f.end_with?('.c.tmpl') || f.end_with?('.inc.erb')
end

files.each_with_index do |file, index|
  print "\r#{index}/#{files.size}"
  src = File.read(file)
  src.gsub!(/^\t+/) { |tabs| ' ' * (8 * tabs.length) }
  File.write(file, src)
end

.git-blame-ignore-revs is supposed to be created after merging this.

[mame]

I think ext/nkf/nkf-utf8/* should be also skipped.

[k0kubun]

Reflected that to the original script ruby/git.ruby-lang.org@29fdc8a and updated the commit in this PR.