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178 lines
3.5 KiB
178 lines
3.5 KiB
#!/usr/bin/env perl |
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# SPDX-License-Identifier: GPL-2.0 |
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# |
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# Clean a text file -- or directory of text files -- of stealth whitespace. |
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# WARNING: this can be a highly destructive operation. Use with caution. |
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# |
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use warnings; |
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use bytes; |
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use File::Basename; |
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# Default options |
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$max_width = 79; |
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# Clean up space-tab sequences, either by removing spaces or |
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# replacing them with tabs. |
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sub clean_space_tabs($) |
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{ |
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no bytes; # Tab alignment depends on characters |
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my($li) = @_; |
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my($lo) = ''; |
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my $pos = 0; |
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my $nsp = 0; |
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my($i, $c); |
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for ($i = 0; $i < length($li); $i++) { |
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$c = substr($li, $i, 1); |
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if ($c eq "\t") { |
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my $npos = ($pos+$nsp+8) & ~7; |
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my $ntab = ($npos >> 3) - ($pos >> 3); |
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$lo .= "\t" x $ntab; |
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$pos = $npos; |
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$nsp = 0; |
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} elsif ($c eq "\n" || $c eq "\r") { |
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$lo .= " " x $nsp; |
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$pos += $nsp; |
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$nsp = 0; |
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$lo .= $c; |
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$pos = 0; |
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} elsif ($c eq " ") { |
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$nsp++; |
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} else { |
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$lo .= " " x $nsp; |
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$pos += $nsp; |
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$nsp = 0; |
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$lo .= $c; |
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$pos++; |
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} |
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} |
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$lo .= " " x $nsp; |
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return $lo; |
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} |
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# Compute the visual width of a string |
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sub strwidth($) { |
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no bytes; # Tab alignment depends on characters |
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my($li) = @_; |
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my($c, $i); |
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my $pos = 0; |
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my $mlen = 0; |
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for ($i = 0; $i < length($li); $i++) { |
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$c = substr($li,$i,1); |
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if ($c eq "\t") { |
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$pos = ($pos+8) & ~7; |
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} elsif ($c eq "\n") { |
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$mlen = $pos if ($pos > $mlen); |
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$pos = 0; |
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} else { |
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$pos++; |
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} |
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} |
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$mlen = $pos if ($pos > $mlen); |
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return $mlen; |
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} |
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$name = basename($0); |
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@files = (); |
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while (defined($a = shift(@ARGV))) { |
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if ($a =~ /^-/) { |
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if ($a eq '-width' || $a eq '-w') { |
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$max_width = shift(@ARGV)+0; |
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} else { |
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print STDERR "Usage: $name [-width #] files...\n"; |
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exit 1; |
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} |
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} else { |
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push(@files, $a); |
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} |
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} |
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foreach $f ( @files ) { |
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print STDERR "$name: $f\n"; |
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if (! -f $f) { |
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print STDERR "$f: not a file\n"; |
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next; |
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} |
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if (!open(FILE, '+<', $f)) { |
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print STDERR "$name: Cannot open file: $f: $!\n"; |
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next; |
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} |
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binmode FILE; |
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# First, verify that it is not a binary file; consider any file |
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# with a zero byte to be a binary file. Is there any better, or |
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# additional, heuristic that should be applied? |
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$is_binary = 0; |
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while (read(FILE, $data, 65536) > 0) { |
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if ($data =~ /\0/) { |
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$is_binary = 1; |
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last; |
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} |
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} |
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if ($is_binary) { |
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print STDERR "$name: $f: binary file\n"; |
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next; |
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} |
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seek(FILE, 0, 0); |
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$in_bytes = 0; |
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$out_bytes = 0; |
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$blank_bytes = 0; |
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@blanks = (); |
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@lines = (); |
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$lineno = 0; |
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while ( defined($line = <FILE>) ) { |
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$lineno++; |
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$in_bytes += length($line); |
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$line =~ s/[ \t\r]*$//; # Remove trailing spaces |
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$line = clean_space_tabs($line); |
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if ( $line eq "\n" ) { |
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push(@blanks, $line); |
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$blank_bytes += length($line); |
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} else { |
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push(@lines, @blanks); |
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$out_bytes += $blank_bytes; |
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push(@lines, $line); |
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$out_bytes += length($line); |
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@blanks = (); |
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$blank_bytes = 0; |
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} |
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$l_width = strwidth($line); |
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if ($max_width && $l_width > $max_width) { |
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print STDERR |
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"$f:$lineno: line exceeds $max_width characters ($l_width)\n"; |
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} |
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} |
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# Any blanks at the end of the file are discarded |
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if ($in_bytes != $out_bytes) { |
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# Only write to the file if changed |
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seek(FILE, 0, 0); |
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print FILE @lines; |
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if ( !defined($where = tell(FILE)) || |
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!truncate(FILE, $where) ) { |
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die "$name: Failed to truncate modified file: $f: $!\n"; |
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} |
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} |
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close(FILE); |
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}
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