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#!/usr/bin/perl
# -*- perl -*-
#
# unwrapdiff - demangle word-wrapped patches
# 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
# Set non-zero if unwrapdiff doesn't work. It won't fix it, but at least
# it'll say more.
$debug = 0;
$verbose = 0;
use Getopt::Std;
getopts('v-:', \%opts);
if ($opts{'-'} && $opts{'-'} eq 'version') {
print "unwrapdiff - patchutils version 0.3.4\n";
exit 0;
}
if ($opts{'-'} && $opts{'-'} eq 'help') {
print "usage: unwrapdiff [OPTIONS] [FILE...]\n";
print "OPTIONS are:\n";
print " -v verbose output (to stderr)\n";
exit 0;
}
if ($opts{'v'}) {
$verbose = 1;
}
@line=<>;
$hazard = 0;
$joined = 0;
$i=-1;
$state=0;
$chunk_start = 0;
$orig=0;
$new=0;
$orig_offset=0;
$new_offset=0;
$misc="";
@blankline = ();
while ($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 (/^--- /) { $state = 1; }
elsif ($i + 1 < $#line &&
$line[$i + 1] =~ /^\+\+\+ /) {
chomp($line[$i - 1]);
$line[$i - 1] .= " " . $line[$i];
splice (@line, $i, 1);
$joined++;
$i--;
$state = 1;
}
else { $state = 0; }
next;
}
$state++;
} elsif ($state == 2) {
# Start of chunk. Should be '@@ ...'
unless (/^@@ -(\d+),?(\d+)? \+(\d+),?(\d+)? @@(.*)$/) {
if (/^--- /) { $state = 1; }
elsif ($i + 1 < $#line &&
$line[$i + 1] =~ /^@@ /) {
chomp($line[$i - 1]);
$line[$i - 1] .= " " . $line[$i];
splice (@line, $i, 1);
$joined++;
$i--;
$state = 2;
}
else { $state = 0; }
next;
}
($orig_offset,$orig,$new_offset,$new,$misc) = ($1,$2,$3,$4,$5);
$state++;
$orig = 1 unless defined($2);
$new = 1 unless defined($4);
$chunk_start = $i + 1;
print STDERR "# State 2, $orig, $new\n" if $debug;
} elsif ($state == 3) {
# Counting lines.
if (/^ /) {
$orig--;
$new--;
}
elsif (/^\+/) {
$new--;
}
elsif (/^-/) {
$orig--;
}
elsif (/^\\/) { }
elsif (/^$/) {
# This blank line might be meant to represent ' ', or
# it might be superfluous altogether. Try ' ' first,
# and if that doesn't work we can start deleting the lines
# that were originally blank until the counts work.
print STDERR "#Blank line $i\n" if $debug;
push (@blankline, $i);
$line[$i] = " \n";
$i--;
next;
}
elsif (/^@/) {
print STDERR "unwrapdiff: patch may be damaged near line "
. ($i + $joined) . ".\n";
$hazard = 1;
$i--;
$state = 2;
@blankline = ();
}
elsif ($chunk_start < $i) {
$i--;
chomp($line[$i]);
print STDERR "Constructed line $i from:\n" .
"$line[$i]\n$line[$i + 1]"
if $debug || $verbose;
# Decide whether there was a space in the line
# before it was wrapped. We have to use
# heuristics for this.
$space = " ";
$_ = $line[$i];
if (/(.)\1\1$/ && $line[$i + 1] =~ /^\Q$1$1\E/) {
$space = "";
}
$line[$i] .= $space . $line[$i + 1];
splice (@line, $i + 1, 1);
$joined++;
print STDERR "to make:\n$line[$i]" if $debug || $verbose;
}
if ($orig < 1 && $new < 1) {
if ($orig != 0 || $new != 0) {
# The numbers don't add up.
if ($#blankline >= 0) {
# Let's see if we can fix it by deleting lines that
# were originally blank.
# Remove the last line.
print STDERR
"# Removed $blankline[$#blankline] to fix counts\n"
if $debug;
splice (@line, $blankline[$#blankline], 1);
splice (@blankline, $#blankline, 1);
$joined++; # for line number reporting
# Make all the others blank again.
foreach $l (@blankline) { $line[$l] = ""; }
$i = $chunk_start - 2;
$state = 2;
print STDERR "# Reset to $i\n" if $debug;
# Re-read this hunk from the beginning again.
next;
}
print STDERR "unwrapdiff: patch may be damaged near line "
. ($i + $joined) . ".\n";
$hazard = 1;
}
# Check to see if the last line of this hunk seems to
# be wrapped or not. If this is the last line, or the
# next line starts with '--- ' or 'diff ' or 'Index: '
# then it's probably not wrapped. Otherwise it might
# well be.
else {
unless ($i == $#line ||
$line[$i + 1] =~ /^@@/ ||
$line[$i + 1] =~ /^--- / ||
$line[$i + 1] =~ /^diff / ||
$line[$i + 1] =~ /^Index: /) {
chomp($line[$i]);
print STDERR "Constructed line $i from:\n" .
"$line[$i]\n$line[$i + 1]"
if $debug || $verbose;
# Decide whether there was a space in the line
# before it was wrapped. We have to use
# heuristics for this.
$space = " ";
$_ = $line[$i];
if (/\*\*\*\*\*$/) {
$space = "";
}
$line[$i] .= $space . $line[$i + 1];
splice (@line, $i + 1, 1);
$joined++;
print STDERR "to make:\n$line[$i]" if $debug || $verbose;
# But only handle one line of wrapped text in this case.
}
}
$state = 2;
@blankline = ();
}
}
}
if ($orig != 0 || $new != 0) {
print STDERR "unwrapdiff: patch may be damaged.\n";
$hazard = 1;
}
print @line;
exit ($hazard);
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