Jeff Garzik wrote:
Attached to this email is chomp.pl, a Perl script which removes trailing
whitespace from several files. I've had this for years, as trailing
whitespace is one of my pet peeves.
Now that git-applymbox complains loudly whenever a patch adds trailing
whitespace, I figured this script may be useful to others.
This is the script I use for the same purpose. It's a bit more
sophisticated, in that it detects and avoids binary files, and doesn't
throw an error if it encounters a directory (which can happen if you
give it a wildcard.)
-hpa
#!/usr/bin/perl
#
# Clean a text file of stealth whitespace
#
use bytes;
$name = 'cleanfile';
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
$is_binary = 0;
while (read(FILE, $data, 65536) > 0) {
if ($data =~ /\0/) {
$is_binary = 1;
last;
}
}
if ($is_binary) {
print STDERR "$name: $f: binary file\n";
next;
}
seek(FILE, 0, 0);
@blanks = ();
@lines = ();
while ( defined($line = <FILE>) ) {
$line =~ s/[ \t\r\n]*$/\n/;
if ( $line eq "\n" ) {
push(@blanks, $line);
} else {
push(@lines, @blanks);
push(@lines, $line);
@blanks = ();
}
}
# Any blanks at the end of the file are discarded
seek(FILE, 0, 0);
print FILE @lines;
if ( !defined($where = tell(FILE)) ||
!truncate(FILE, $where) ) {
die "$name: Failed to truncate modified file: $f: $!\n";
}
close(FILE);
}
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