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#!/usr/bin/env perl
# $Id$
# Public domain. Originally written 2008, Karl Berry.
# Compare two files considering CR, LF, and CRLF as equivalent,
# ignoring blank lines,
# and ignoring %% lines (see below).
#
# Used in place and tlpkg-ctan-check in TeX Live.
exit (&main ());
sub main {
if (@ARGV != 2) {
warn <<END_USAGE;
Usage: $0 FILE1 FILE2.
Compare as text files, ignoring line endings and %% lines.
Exit status is zero if the same, 1 if different, something else if trouble.
END_USAGE
exit $ARGV[0] eq "--help" ? 0 : 2;
}
my $file1 = &read_file ($ARGV[0]);
my $file2 = &read_file ($ARGV[1]);
return $file1 eq $file2 ? 0 : 1;
}
# Return contents of FNAME as a string, converting all of CR, LF, and
# CRLF to just LF.
#
# Also, annoyingly, ignore lines consisting only of "%%". For an
# unknown reason, derived files on CTAN often contain these lines, while
# the same files regenerated by us do not. CTAN's general policy is not
# to hold derived files, but there are too many exceptions and it is not
# worth the time to continually contact CTAN and authors.
#
sub read_file {
my ($fname) = @_;
my $ret = "";
open (my $FILE, $fname) || die "open($fname) failed: $!";
while (<$FILE>) {
s/\r\n?/\n/g;
next if /^\s*%%\s*$/; # ignore %% lines, see above.
#warn "line is |$_|";
$ret .= $_;
}
close ($FILE) || warn "close($fname) failed: $!";
# if the file did not have a trailing newline, add one for purposes of
# comparison, since it can slip in if we edit it, etc.
$ret .= "\n" if substr ($ret, -1) ne "\n";
return $ret;
}
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