1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
|
#!/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[
abbrev
base64
benchmark
bundler
cmath
csv
debug
delegate
did_you_mean
drb
english
erb
fileutils
find
forwardable
getoptlong
ipaddr
irb
logger
mutex_m
net-http
net-protocol
observer
open3
open-uri
optparse
ostruct
pp
prettyprint
prime
pstore
rdoc
readline
reline
resolv
resolv-replace
rexml
rinda
rss
rubygems
scanf
securerandom
set
shellwords
singleton
tempfile
thwait
time
timeout
tmpdir
un
tsort
uri
weakref
yaml
]
DEFAULT_GEM_EXTS = %w[
bigdecimal
cgi
date
digest
etc
fcntl
fiddle
io-console
io-nonblock
io-wait
json
nkf
openssl
pathname
psych
racc
readline-ext
stringio
strscan
syslog
win32ole
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
|
