Jeff Garzik wrote:
H. Peter Anvin wrote:
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.)
Chewing the EOF blanks is nice. The only nit I have is that your script
rewrites the file even if nothing was changed.
Ah, good point. Attached version fixes that. It still doesn't break
hard links, which may be a desirable feature.
-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);
$in_bytes = 0;
$out_bytes = 0;
$blank_bytes = 0;
@blanks = ();
@lines = ();
while ( defined($line = <FILE>) ) {
$in_bytes += length($line);
$line =~ s/[ \t\r\n]*$/\n/;
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);
}
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
