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#!/l/local/bin/perl -wspi.bak
#
# reads a perforce style diff on stdin and outputs appropriate headers
# so the diff can be applied with the patch program
#
# Gurusamy Sarathy <gsar@activestate.com>
#
BEGIN {
$0 =~ s|.*/||;
if ($h or $help) {
print STDERR <<USAGE;
Usage: $0 [-v] [-h] files
-h print this help
-v output progress messages
Does inplace edit of diff files output by the perforce commands
"p4 describe", "p4 diff", and "p4 diff2". The result is suitable
for feeding to the "patch" program.
If no files are specified, reads from stdin and writes to stdout.
WARNING: It only handles context or unified diffs.
Example: p4 describe -du 123 | $0 > change-123.patch
USAGE
exit(0);
}
unless (@ARGV) { @ARGV = '-'; undef $^I; }
use vars qw($thisfile $time $file $fnum $v $h $help);
$thisfile = "";
$time = localtime(time);
}
my ($cur, $match);
$cur = m<^==== //depot/(.+?)\#\d+.* ====$> ... m<^(\@\@.+\@\@|\*+)$>;
$match = $1;
if ($ARGV ne $thisfile) {
warn "processing patchfile [$ARGV]\n" unless $ARGV eq '-';
$thisfile = $ARGV;
}
# while we are within range
if ($cur) {
# set the file name after first line
if ($cur == 1) {
$file = $match;
$fnum++;
}
# emit the diff header when we hit last line
elsif ($cur =~ /E0$/) {
my $f = $file;
# special hack for perl so we can always use "patch -p1"
$f =~ s<^.*?(perl.*?/)><$1>;
# unified diff
if ($match =~ /^\@/) {
warn "emitting udiff header\n" if $v;
$_ = "Index: $f\n--- $f.~1~\t$time\n+++ $f\t$time\n$_";
}
# context diff
elsif ($match =~ /^\*/) {
warn "emitting cdiff header\n" if $v;
$_ = "Index: $f\n*** $f.~1~\t$time\n--- $f\t$time\n$_";
}
}
# see if we hit another patch (i.e. previous patch was empty)
elsif (m<^==== //depot/(.+?)\#\d+.* ====$>) {
$file = $match = $1;
}
# suppress all other lines in the header
else {
$_ = "";
}
warn "file [$file] line [$cur] file# [$fnum]\n" if $v;
}
$_ .= "End of Patch.\n" if eof;
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