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#!/usr/bin/perl -w
# diffsplit - split up unified diffs
#
# Copyright (C) 2001-2002 Transmeta Corporation
#
# written by Daniel Quinlan <quinlan@transmeta.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
$prog = $0;
$prog =~ s@.*/@@;
use Getopt::Std;
use vars qw($opt_d $opt_h $opt_q $opt_t);
if (defined($ENV{DIFFSPLIT})) {
unshift(@ARGV, $ENV{DIFFSPLIT});
}
getopts("b:cdho:p:qs:t");
if ($#ARGV < 0) {
push(@ARGV, "-");
}
if ($opt_h) {
usage(0);
}
if ($opt_c) {
$regexp = '^Index:\s+(.*)';
}
else {
$regexp = '^diff\s+.*\s+(\S+)';
}
foreach $file (@ARGV) {
if (!open(IN, $file)) {
warn("$prog: $file: $!\n");
next;
}
$out = '';
$name = 'header';
$in_header = 0;
while(<IN>) {
if (/^@@/) {
$in_header = 0;
}
if ($opt_c) {
s/^([-+][-+][-+]) (\S+)/$1 $name/;
}
if (/$regexp/ ||
(! $in_header && /^(\-\-\-) (\S+)/ && ($no_name = 1)))
{
# save last file
$last = $name;
&close_file($last);
$in_header = 1;
$name = $1;
if ($no_name) {
$no_name = 0;
$out .= $_;
$_ = <IN>;
if (/^\+\+\+ (\S+)/) {
$name = $1;
}
}
}
$out .= $_;
}
&close_file($name);
close(IN);
}
sub close_file {
my ($name) = @_;
my $orig;
if ($opt_p) {
$name =~ s/^$opt_p//;
}
if ($opt_b) {
$name =~ s/^/$opt_b/;
}
$orig = $name;
if ($out ne '') {
if ($opt_d) {
$name =~ s@/[^/]+$@@;
}
if ($opt_o) {
$name = $opt_o;
}
if ($opt_s && $name ne "header") {
$name .= $opt_s;
}
$name =~ s@/@_@g;
if (-e $name && ! $seen{$name}) {
die "$prog: \"$name\" already exists, stopping\n";
}
if (! $opt_q) {
print STDERR "file: $orig -> $name\n";
}
if (! $opt_t) {
open(OUT, ">> $name");
print OUT $out;
close(OUT);
}
$seen{$name}++;
$out = '';
}
}
sub usage {
$status = shift;
$out = $status ? STDERR : STDOUT;
print $out <<EOF;
usage: $prog [options] [file ...]
Split up unified diffs. If no files are supplied, operates on standard input.
-b begin add begin to the front of each filename
-c input is a CVS diff (splits correctly and fixes diff filenames)
-d split by directory name instead of filename
-h print this help
-o file create a single output file, "-" outputs to stdout (useful with -c)
-p prefix strip prefix from the front of each filename (use / characters)
-q run quietly
-s .suf use suffix .suf on created files (default is no suffix)
-t test run (no writes)
EOF
exit($status);
}
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