#!/usr/bin/perl -w## Clean a text file -- or directory of text files -- of stealth whitespace.# WARNING: this can be a highly destructive operation. Use with caution.# use bytes;use File::Basename; ## 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;} $name = basename($0); foreach $f ( @ARGV ) { print STDERR "$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; $blank_bytes = 0; @blanks = (); @lines = (); while ( defined($line = <FILE>) ) { $in_bytes += length($line); $line =~ s/[ \t\r]*$//; # Remove trailing spaces $line = clean_space_tabs($line); if ( $line eq "\n" ) { push(@blanks, $line); $blank_bytes += length($line); } else { push(@lines, @blanks); $out_bytes += $blank_bytes; push(@lines, $line); $out_bytes += length($line); @blanks = (); $blank_bytes = 0; } } # Any blanks at the end of the file are discarded if ($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: $!\n"; } } close(FILE);}
#!/usr/bin/perl -w
#
# Clean a text file -- or directory of text files -- of stealth whitespace.
# WARNING: this can be a highly destructive operation. Use with caution.
#
use bytes;
use File::Basename;
#
# Clean up space-tab sequences, either by removing spaces or
# replacing them with tabs.
sub clean_space_tabs($)
{
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;
}
$name = basename($0);
foreach $f ( @ARGV ) {
print STDERR "$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;
$blank_bytes = 0;
@blanks = ();
@lines = ();
while ( defined($line = <FILE>) ) {
$in_bytes += length($line);
$line =~ s/[ \t\r]*$//; # Remove trailing spaces
$line = clean_space_tabs($line);
if ( $line eq "\n" ) {
push(@blanks, $line);
$blank_bytes += length($line);
} else {
push(@lines, @blanks);
$out_bytes += $blank_bytes;
push(@lines, $line);
$out_bytes += length($line);
@blanks = ();
$blank_bytes = 0;
}
}
# Any blanks at the end of the file are discarded
if ($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);
}