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name : recountdiff
 #!/usr/bin/perl
# -*- perl -*-
#
# recountdiff - recompute patch counts and offsets
# Copyright (C) 2002  Tim Waugh <twaugh@redhat.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

use Getopt::Std;
getopts('-:', \%opts);
if ($opts{'-'} && $opts{'-'} eq 'version') {
    print "recountdiff - patchutils version 0.3.4\n";
    exit 0;
}
if ($opts{'-'} && $opts{'-'} eq 'help') {
    print "usage: recountdiff [FILE...]\n";
    exit 0;
}

@line=<>;

# First pass: fix up the counts.
$i=-1;
$state=0;
$chunk_start = 0;
$orig=0;
$new=0;
$orig_offset=0;
$new_offset=0;
$misc="";
@off_lines = ();
while ($i < $#line) {
    $i++;
    $_=$line[$i];
    if ($state == 0) {
	# Looking for the start of a file change.
	unless(/^--- /) {
	    next;
	}
	$state++;
    } elsif ($state == 1) {
	# Should be '+++ ...'.
	unless (/^\+\+\+ /) {
		if (/^--- /) { $state = 1; }
		else { $state = 0; }
		next;
	}
	$state++;
    } elsif ($state == 2) {
	# Start of chunk.  Should be '@@ ...'
	unless (/^@@ -(\d+),?(\d+)? \+(\d+),?(\d+)? @@(.*)$/) {
		if (/^--- /) { $state = 1; }
		else { $state = 0; }
		next;
	}
	($orig_offset,$new_offset,$misc) = ($1,$3,$5);
	$orig_offset++ if defined($2) and $2 == 0;
	$new_offset++ if defined($4) and $4 == 0;
	$state++;
	$orig=0;
	$new=0;
	$chunk_start = $i + 1;
    } elsif ($state == 3) {
	# Counting lines.
	my $spit = 0;
	if (/^\s/ or /^$/) { $orig++; $new++; }
	elsif (/^\+/) { $new++; }
	elsif (/^-/) {
	    # Look out for new file changes.
	    if (/^--- /) {
		if ($i+2 <= $#line) {
		    if ($line[$i+2] =~ /^@/) {
			$spit = 1;
		    }
		}
	    } else {
		$orig++;
	    }
	} elsif (/^\\/) { }
	else {
	    $spit = 1;
	}

	$spit = 1 if ($i == $#line);

	if ($spit) {
	    # Spit them out.
	    $chunk_start--;
	    $orig_offset-- if ($orig == 0);
	    $new_offset-- if ($new == 0);
	    $line[$chunk_start] = "@@ -$orig_offset";
	    $line[$chunk_start] .= ",$orig" if ($orig != 1);
	    $line[$chunk_start] .= " +$new_offset";
	    $line[$chunk_start] .= ",$new" if ($new != 1);
	    $line[$chunk_start] .= " @@" . "$misc\n";
	    push (@off_lines, $chunk_start);

	    if (/^@/) { $state = 2; $i--; }
	    else {
		$state = 0;
		$i--;
		push (@off_lines, -1)
	    }
	}
    }
}

# Second pass: fix up the offsets.
$offset = 0;
foreach (@off_lines) {
    if ($_ == -1) {
	$offset = 0;
	next;
    }
    $line[$_] =~ /^@@ -(\d+),?(\d+)? \+(\d+),?(\d+)? @@(.*)$/;
    ($ooff,$oc,$nc,$misc) = ($1,$2,$4,$5);
    $oc = 1 unless defined($oc);
    $nc = 1 unless defined($nc);
    $noff = $ooff + $offset;
    $noff++ if ($oc == 0);
    $noff-- if ($nc == 0);
    $line[$_] = "@@ -$ooff";
    $line[$_] .= ",$oc" if ($oc != 1);
    $line[$_] .= " +$noff";
    $line[$_] .= ",$nc" if ($nc != 1);
    $line[$_] .= " @@" . "$misc\n";
    $offset += $nc - $oc;
}

print @line;
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