3 # Clean a text file -- or directory of text files -- of stealth whitespace.
4 # WARNING: this can be a highly destructive operation. Use with caution.
13 # Clean up space-tab sequences, either by removing spaces or
14 # replacing them with tabs.
15 sub clean_space_tabs
($)
17 no bytes
; # Tab alignment depends on characters
25 for ($i = 0; $i < length($li); $i++) {
26 $c = substr($li, $i, 1);
28 my $npos = ($pos+$nsp+8) & ~7;
29 my $ntab = ($npos >> 3) - ($pos >> 3);
33 } elsif ($c eq "\n" || $c eq "\r") {
53 # Compute the visual width of a string
55 no bytes
; # Tab alignment depends on characters
62 for ($i = 0; $i < length($li); $i++) {
63 $c = substr($li,$i,1);
66 } elsif ($c eq "\n") {
67 $mlen = $pos if ($pos > $mlen);
74 $mlen = $pos if ($pos > $mlen);
82 while (defined($a = shift(@ARGV))) {
84 if ($a eq '-width' || $a eq '-w') {
85 $max_width = shift(@ARGV)+0;
87 print STDERR
"Usage: $name [-width #] files...\n";
95 foreach $f ( @files ) {
96 print STDERR
"$name: $f\n";
99 print STDERR
"$f: not a file\n";
103 if (!open(FILE
, '+<', $f)) {
104 print STDERR
"$name: Cannot open file: $f: $!\n";
110 # First, verify that it is not a binary file; consider any file
111 # with a zero byte to be a binary file. Is there any better, or
112 # additional, heuristic that should be applied?
115 while (read(FILE
, $data, 65536) > 0) {
123 print STDERR
"$name: $f: binary file\n";
137 while ( defined($line = <FILE
>) ) {
139 $in_bytes += length($line);
140 $line =~ s/[ \t\r]*$//; # Remove trailing spaces
141 $line = clean_space_tabs
($line);
143 if ( $line eq "\n" ) {
144 push(@blanks, $line);
145 $blank_bytes += length($line);
147 push(@lines, @blanks);
148 $out_bytes += $blank_bytes;
150 $out_bytes += length($line);
155 $l_width = strwidth
($line);
156 if ($max_width && $l_width > $max_width) {
158 "$f:$lineno: line exceeds $max_width characters ($l_width)\n";
162 # Any blanks at the end of the file are discarded
164 if ($in_bytes != $out_bytes) {
165 # Only write to the file if changed
169 if ( !defined($where = tell(FILE
)) ||
170 !truncate(FILE
, $where) ) {
171 die "$name: Failed to truncate modified file: $f: $!\n";
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