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[perl5.git] / Porting / p4d2p
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384f7be5
GS
1#!/l/local/bin/perl -wspi.bak
2
3#
4# reads a perforce style diff on stdin and outputs appropriate headers
5# so the diff can be applied with the patch program
6#
6e238990 7# Gurusamy Sarathy <gsar@activestate.com>
384f7be5
GS
8#
9
10BEGIN {
11 $0 =~ s|.*/||;
12 if ($h or $help) {
13 print STDERR <<USAGE;
14Usage: $0 [-v] [-h] files
15
16 -h print this help
17 -v output progress messages
18
19Does inplace edit of diff files output by the perforce commands
20"p4 describe", "p4 diff", and "p4 diff2". The result is suitable
21for feeding to the "patch" program.
22
23If no files are specified, reads from stdin and writes to stdout.
24
25WARNING: It only handles context or unified diffs.
26
27Example: p4 describe -du 123 | $0 > change-123.patch
28
29USAGE
30 exit(0);
31 }
32 unless (@ARGV) { @ARGV = '-'; undef $^I; }
33 use vars qw($thisfile $time $file $fnum $v $h $help);
34 $thisfile = "";
35 $time = localtime(time);
36}
37
38my ($cur, $match);
39$cur = m<^==== //depot/(.+?)\#\d+.* ====$> ... m<^(\@\@.+\@\@|\*+)$>;
40
41$match = $1;
42
43if ($ARGV ne $thisfile) {
44 warn "processing patchfile [$ARGV]\n" unless $ARGV eq '-';
45 $thisfile = $ARGV;
46}
47
48# while we are within range
49if ($cur) {
50 # set the file name after first line
51 if ($cur == 1) {
52 $file = $match;
53 $fnum++;
54 }
55 # emit the diff header when we hit last line
56 elsif ($cur =~ /E0$/) {
57 my $f = $file;
58
59 # special hack for perl so we can always use "patch -p1"
60 $f =~ s<^.*?(perl.*?/)><$1>;
61
62 # unified diff
63 if ($match =~ /^\@/) {
64 warn "emitting udiff header\n" if $v;
65 $_ = "Index: $f\n--- $f.~1~\t$time\n+++ $f\t$time\n$_";
66 }
67 # context diff
68 elsif ($match =~ /^\*/) {
69 warn "emitting cdiff header\n" if $v;
70 $_ = "Index: $f\n*** $f.~1~\t$time\n--- $f\t$time\n$_";
71 }
72 }
73 # see if we hit another patch (i.e. previous patch was empty)
74 elsif (m<^==== //depot/(.+?)\#\d+.* ====$>) {
75 $file = $match = $1;
76 }
77 # suppress all other lines in the header
78 else {
79 $_ = "";
80 }
81 warn "file [$file] line [$cur] file# [$fnum]\n" if $v;
82}
83
84$_ .= "End of Patch.\n" if eof;