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|
#!/usr/bin/env ruby --disable-gems
# Add the following line to your `.git/hooks/pre-commit`:
#
# $ ruby --disable-gems misc/expand_tabs.rb
#
require 'shellwords'
require 'tmpdir'
ENV['LC_ALL'] = 'C'
class Git
def initialize(oldrev, newrev)
@oldrev = oldrev
@newrev = newrev
end
# ["foo/bar.c", "baz.h", ...]
def updated_paths
with_clean_env do
IO.popen(['git', 'diff', '--cached', '--name-only', @newrev], &:readlines).each(&:chomp!)
end
end
# [0, 1, 4, ...]
def updated_lines(file)
lines = []
revs_pattern = ("0"*40) + " "
with_clean_env { IO.popen(['git', 'blame', '-l', '--', file], &:readlines) }.each_with_index do |line, index|
if line.b.start_with?(revs_pattern)
lines << index
end
end
lines
end
def add(file)
git('add', file)
end
def toplevel
IO.popen(['git', 'rev-parse', '--show-toplevel'], &:read).chomp
end
private
def git(*args)
cmd = ['git', *args].shelljoin
unless with_clean_env { system(cmd) }
abort "Failed to run: #{cmd}"
end
end
def with_clean_env
git_dir = ENV.delete('GIT_DIR') # this overcomes '-C' or pwd
yield
ensure
ENV['GIT_DIR'] = git_dir if git_dir
end
end
DEFAULT_GEM_LIBS = %w[
bundler
cmath
csv
e2mmap
fileutils
forwardable
ipaddr
irb
logger
matrix
mutex_m
ostruct
prime
racc
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
sdbm
stringio
strscan
zlib
]
EXPANDTAB_IGNORED_FILES = [
# default gems whose master is GitHub
%r{\Abin/(?!erb)\w+\z},
*DEFAULT_GEM_LIBS.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 (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},
]
git = Git.new('HEAD^', 'HEAD')
Dir.chdir(git.toplevel) do
paths = git.updated_paths
paths.select! {|f|
(f.end_with?('.c') || f.end_with?('.h') || f == 'insns.def') && EXPANDTAB_IGNORED_FILES.all? { |re| !f.match(re) }
}
files = paths.select {|n| File.file?(n)}
exit if files.empty?
files.each do |f|
src = File.binread(f) rescue next
expanded = false
updated_lines = git.updated_lines(f)
unless updated_lines.empty?
src.gsub!(/^.*$/).with_index do |line, lineno|
if updated_lines.include?(lineno) && line.start_with?("\t") # last-committed line with hard tabs
expanded = true
line.sub(/\A\t+/) { |tabs| ' ' * (8 * tabs.length) }
else
line
end
end
end
if expanded
File.binwrite(f, src)
git.add(f)
end
end
end
|
