FilesExpand file tree

master

/

cleanpatch

Copy path

Blame

More file actions

Blame

More file actions

Latest commit

 

History

History

History

executable file

·

258 lines (218 loc) · 5.01 KB

master

/

cleanpatch

Copy path

Top

File metadata and controls

• Code
• Blame

executable file

·

258 lines (218 loc) · 5.01 KB

Raw

Copy raw file

Download raw file

Open symbols panel

Edit and raw actions

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

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

#!/usr/bin/perl -w

#

# Clean a patch file -- or directory of patch files -- of stealth whitespace.

# WARNING: this can be a highly destructive operation. Use with caution.

#

use bytes;

use File::Basename;

# Default options

$max_width = 79;

# Clean up space-tab sequences, either by removing spaces or

# replacing them with tabs.

sub clean_space_tabs($)

{

no bytes; # Tab alignment depends on characters

my($li) = @_;

my($lo) = '';

my $pos = 0;

my $nsp = 0;

my($i, $c);

for ($i = 0; $i < length($li); $i++) {

$c = substr($li, $i, 1);

if ($c eq "\t") {

my $npos = ($pos+$nsp+8) & ~7;

my $ntab = ($npos >> 3) - ($pos >> 3);

$lo .= "\t" x $ntab;

$pos = $npos;

$nsp = 0;

} elsif ($c eq "\n" || $c eq "\r") {

$lo .= " " x $nsp;

$pos += $nsp;

$nsp = 0;

$lo .= $c;

$pos = 0;

} elsif ($c eq " ") {

$nsp++;

} else {

$lo .= " " x $nsp;

$pos += $nsp;

$nsp = 0;

$lo .= $c;

$pos++;

}

}

$lo .= " " x $nsp;

return $lo;

}

# Compute the visual width of a string

sub strwidth($) {

no bytes; # Tab alignment depends on characters

my($li) = @_;

my($c, $i);

my $pos = 0;

my $mlen = 0;

for ($i = 0; $i < length($li); $i++) {

$c = substr($li,$i,1);

if ($c eq "\t") {

$pos = ($pos+8) & ~7;

} elsif ($c eq "\n") {

$mlen = $pos if ($pos > $mlen);

$pos = 0;

} else {

$pos++;

}

}

$mlen = $pos if ($pos > $mlen);

return $mlen;

}

$name = basename($0);

@files = ();

while (defined($a = shift(@ARGV))) {

if ($a =~ /^-/) {

if ($a eq '-width' || $a eq '-w') {

$max_width = shift(@ARGV)+0;

} else {

print STDERR "Usage: $name [-width #] files...\n";

exit 1;

}

} else {

push(@files, $a);

}

}

foreach $f ( @files ) {

print STDERR "$name: $f\n";

if (! -f $f) {

print STDERR "$f: not a file\n";

next;

}

if (!open(FILE, '+<', $f)) {

print STDERR "$name: Cannot open file: $f: $!\n";

next;

}

binmode FILE;

# First, verify that it is not a binary file; consider any file

# with a zero byte to be a binary file. Is there any better, or

# additional, heuristic that should be applied?

$is_binary = 0;

while (read(FILE, $data, 65536) > 0) {

if ($data =~ /\0/) {

$is_binary = 1;

last;

}

}

if ($is_binary) {

print STDERR "$name: $f: binary file\n";

next;

}

seek(FILE, 0, 0);

$in_bytes = 0;

$out_bytes = 0;

$lineno = 0;

@lines = ();

$in_hunk = 0;

$err = 0;

while ( defined($line = <FILE>) ) {

$lineno++;

$in_bytes += length($line);

if (!$in_hunk) {

if ($line =~

/^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@/) {

$minus_lines = $2;

$plus_lines = $4;

if ($minus_lines || $plus_lines) {

$in_hunk = 1;

@hunk_lines = ($line);

}

} else {

push(@lines, $line);

$out_bytes += length($line);

}

} else {

# We're in a hunk

if ($line =~ /^\+/) {

$plus_lines--;

$text = substr($line, 1);

$text =~ s/[ \t\r]*$//; # Remove trailing spaces

$text = clean_space_tabs($text);

$l_width = strwidth($text);

if ($max_width && $l_width > $max_width) {

print STDERR

"$f:$lineno: adds line exceeds $max_width ",

"characters ($l_width)\n";

}

push(@hunk_lines, '+'.$text);

} elsif ($line =~ /^\-/) {

$minus_lines--;

push(@hunk_lines, $line);

} elsif ($line =~ /^ /) {

$plus_lines--;

$minus_lines--;

push(@hunk_lines, $line);

} else {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

last;

}

if ($plus_lines < 0 || $minus_lines < 0) {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

last;

} elsif ($plus_lines == 0 && $minus_lines == 0) {

# End of a hunk. Process this hunk.

my $i;

my $l;

my @h = ();

my $adj = 0;

my $done = 0;

for ($i = scalar(@hunk_lines)-1; $i > 0; $i--) {

$l = $hunk_lines[$i];

if (!$done && $l eq "+\n") {

$adj++; # Skip this line

} elsif ($l =~ /^[ +]/) {

$done = 1;

unshift(@h, $l);

} else {

unshift(@h, $l);

}

}

$l = $hunk_lines[0]; # Hunk header

undef @hunk_lines; # Free memory

if ($adj) {

die unless

($l =~ /^\@\@\s+\-([0-9]+),([0-9]+)\s+\+([0-9]+),([0-9]+)\s\@\@(.*)$/);

my $mstart = $1;

my $mlin = $2;

my $pstart = $3;

my $plin = $4;

my $tail = $5; # doesn't include the final newline

$l = sprintf("@@ -%d,%d +%d,%d @@%s\n",

$mstart, $mlin, $pstart, $plin-$adj,

$tail);

}

unshift(@h, $l);

# Transfer to the output array

foreach $l (@h) {

$out_bytes += length($l);

push(@lines, $l);

}

$in_hunk = 0;

}

}

}

if ($in_hunk) {

print STDERR "$name: $f: malformed patch\n";

$err = 1;

}

if (!$err) {

if ($in_bytes != $out_bytes) {

# Only write to the file if changed

seek(FILE, 0, 0);

print FILE @lines;

if ( !defined($where = tell(FILE)) ||

!truncate(FILE, $where) ) {

die "$name: Failed to truncate modified file: $f: $!\n";

}

}

}

close(FILE);

}