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10554
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1 #!/usr/bin/perl -w
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2 #
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3 # Clean a text file -- or directory of text files -- of stealth whitespace.
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4 # WARNING: this can be a highly destructive operation. Use with caution.
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5 #
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6
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7 use bytes;
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8 use File::Basename;
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9
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10 # Default options
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11 $max_width = 79;
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12
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13 # Clean up space-tab sequences, either by removing spaces or
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14 # replacing them with tabs.
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15 sub clean_space_tabs($)
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16 {
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17 no bytes; # Tab alignment depends on characters
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18
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19 my($li) = @_;
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20 my($lo) = '';
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21 my $pos = 0;
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22 my $nsp = 0;
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23 my($i, $c);
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24
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25 for ($i = 0; $i < length($li); $i++) {
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26 $c = substr($li, $i, 1);
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27 if ($c eq "\t") {
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28 my $npos = ($pos+$nsp+8) & ~7;
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29 my $ntab = ($npos >> 3) - ($pos >> 3);
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30 $lo .= "\t" x $ntab;
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31 $pos = $npos;
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32 $nsp = 0;
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33 } elsif ($c eq "\n" || $c eq "\r") {
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34 $lo .= " " x $nsp;
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35 $pos += $nsp;
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36 $nsp = 0;
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37 $lo .= $c;
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38 $pos = 0;
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39 } elsif ($c eq " ") {
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40 $nsp++;
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41 } else {
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42 $lo .= " " x $nsp;
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43 $pos += $nsp;
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44 $nsp = 0;
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45 $lo .= $c;
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46 $pos++;
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47 }
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48 }
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49 $lo .= " " x $nsp;
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50 return $lo;
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51 }
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52
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53 # Compute the visual width of a string
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54 sub strwidth($) {
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55 no bytes; # Tab alignment depends on characters
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56
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57 my($li) = @_;
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58 my($c, $i);
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59 my $pos = 0;
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60 my $mlen = 0;
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61
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62 for ($i = 0; $i < length($li); $i++) {
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63 $c = substr($li,$i,1);
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64 if ($c eq "\t") {
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65 $pos = ($pos+8) & ~7;
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66 } elsif ($c eq "\n") {
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67 $mlen = $pos if ($pos > $mlen);
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68 $pos = 0;
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69 } else {
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70 $pos++;
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71 }
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72 }
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73
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74 $mlen = $pos if ($pos > $mlen);
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75 return $mlen;
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76 }
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77
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78 $name = basename($0);
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79
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80 @files = ();
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81
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82 while (defined($a = shift(@ARGV))) {
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83 if ($a =~ /^-/) {
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84 if ($a eq '-width' || $a eq '-w') {
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85 $max_width = shift(@ARGV)+0;
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86 } else {
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87 print STDERR "Usage: $name [-width #] files...\n";
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88 exit 1;
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89 }
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90 } else {
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91 push(@files, $a);
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92 }
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93 }
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94
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95 foreach $f ( @files ) {
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96 print STDERR "$name: $f\n";
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97
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98 if (! -f $f) {
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99 print STDERR "$f: not a file\n";
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100 next;
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101 }
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102
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103 if (!open(FILE, '+<', $f)) {
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104 print STDERR "$name: Cannot open file: $f: $!\n";
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105 next;
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106 }
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107
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108 binmode FILE;
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109
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110 # First, verify that it is not a binary file; consider any file
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111 # with a zero byte to be a binary file. Is there any better, or
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112 # additional, heuristic that should be applied?
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113 $is_binary = 0;
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114
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115 while (read(FILE, $data, 65536) > 0) {
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116 if ($data =~ /\0/) {
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117 $is_binary = 1;
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118 last;
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119 }
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120 }
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121
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122 if ($is_binary) {
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123 print STDERR "$name: $f: binary file\n";
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124 next;
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125 }
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126
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127 seek(FILE, 0, 0);
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128
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129 $in_bytes = 0;
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130 $out_bytes = 0;
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131 $blank_bytes = 0;
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132
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133 @blanks = ();
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134 @lines = ();
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135 $lineno = 0;
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136
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137 while ( defined($line = <FILE>) ) {
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138 $lineno++;
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139 $in_bytes += length($line);
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140 $line =~ s/[ \t\r]*$//; # Remove trailing spaces
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141 $line = clean_space_tabs($line);
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142
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143 if ( $line eq "\n" ) {
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144 push(@blanks, $line);
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145 $blank_bytes += length($line);
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146 } else {
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147 push(@lines, @blanks);
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148 $out_bytes += $blank_bytes;
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149 push(@lines, $line);
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150 $out_bytes += length($line);
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151 @blanks = ();
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152 $blank_bytes = 0;
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153 }
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154
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155 $l_width = strwidth($line);
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156 if ($max_width && $l_width > $max_width) {
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157 print STDERR
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158 "$f:$lineno: line exceeds $max_width characters ($l_width)\n";
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159 }
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160 }
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161
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162 # Any blanks at the end of the file are discarded
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163
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164 if ($in_bytes != $out_bytes) {
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165 # Only write to the file if changed
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166 seek(FILE, 0, 0);
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167 print FILE @lines;
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168
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169 if ( !defined($where = tell(FILE)) ||
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170 !truncate(FILE, $where) ) {
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171 die "$name: Failed to truncate modified file: $f: $!\n";
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172 }
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173 }
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174
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175 close(FILE);
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176 }
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