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#!/usr/bin/perl
# List people who might be interested in a patch. Useful as the argument to
# git-send-email --cc-cmd option, and in other situations.
#
# Usage: git contacts <file | rev-list option> ...
use strict;
use warnings;
use IPC::Open2;
my $since = '5-years-ago';
my $min_percent = 10;
my $labels_rx = qr/Signed-off-by|Reviewed-by|Acked-by|Cc/i;
my %seen;
sub format_contact {
my ($name, $email) = @_;
return "$name <$email>";
}
sub parse_commit {
my ($commit, $data) = @_;
my $contacts = $commit->{contacts};
my $inbody = 0;
for (split(/^/m, $data)) {
if (not $inbody) {
if (/^author ([^<>]+) <(\S+)> .+$/) {
$contacts->{format_contact($1, $2)} = 1;
} elsif (/^$/) {
$inbody = 1;
}
} elsif (/^$labels_rx:\s+([^<>]+)\s+<(\S+?)>$/o) {
$contacts->{format_contact($1, $2)} = 1;
}
}
}
sub import_commits {
my ($commits) = @_;
return unless %$commits;
my $pid = open2 my $reader, my $writer, qw(git cat-file --batch);
for my $id (keys(%$commits)) {
print $writer "$id\n";
my $line = <$reader>;
if ($line =~ /^([0-9a-f]{40}) commit (\d+)/) {
my ($cid, $len) = ($1, $2);
die "expected $id but got $cid\n" unless $id eq $cid;
my $data;
# cat-file emits newline after data, so read len+1
read $reader, $data, $len + 1;
parse_commit($commits->{$id}, $data);
}
}
close $reader;
close $writer;
waitpid($pid, 0);
die "git-cat-file error: $?\n" if $?;
}
sub get_blame {
my ($commits, $source, $from, $ranges) = @_;
return unless @$ranges;
open my $f, '-|',
qw(git blame --porcelain -C),
map({"-L$_->[0],+$_->[1]"} @$ranges),
'--since', $since, "$from^", '--', $source or die;
while (<$f>) {
if (/^([0-9a-f]{40}) \d+ \d+ \d+$/) {
my $id = $1;
$commits->{$id} = { id => $id, contacts => {} }
unless $seen{$id};
$seen{$id} = 1;
}
}
close $f;
}
sub blame_sources {
my ($sources, $commits) = @_;
for my $s (keys %$sources) {
for my $id (keys %{$sources->{$s}}) {
get_blame($commits, $s, $id, $sources->{$s}{$id});
}
}
}
sub scan_patches {
my ($sources, $id, $f) = @_;
my $source;
while (<$f>) {
if (/^From ([0-9a-f]{40}) Mon Sep 17 00:00:00 2001$/) {
$id = $1;
$seen{$id} = 1;
}
next unless $id;
if (m{^--- (?:a/(.+)|/dev/null)$}) {
$source = $1;
} elsif (/^--- /) {
die "Cannot parse hunk source: $_\n";
} elsif (/^@@ -(\d+)(?:,(\d+))?/ && $source) {
my $len = defined($2) ? $2 : 1;
push @{$sources->{$source}{$id}}, [$1, $len] if $len;
}
}
}
sub scan_patch_file {
my ($commits, $file) = @_;
open my $f, '<', $file or die "read failure: $file: $!\n";
scan_patches($commits, undef, $f);
close $f;
}
sub parse_rev_args {
my @args = @_;
open my $f, '-|',
qw(git rev-parse --revs-only --default HEAD --symbolic), @args
or die;
my @revs;
while (<$f>) {
chomp;
push @revs, $_;
}
close $f;
return @revs if scalar(@revs) != 1;
return "^$revs[0]", 'HEAD' unless $revs[0] =~ /^-/;
return $revs[0], 'HEAD';
}
sub scan_rev_args {
my ($commits, $args) = @_;
my @revs = parse_rev_args(@$args);
open my $f, '-|', qw(git rev-list --reverse), @revs or die;
while (<$f>) {
chomp;
my $id = $_;
$seen{$id} = 1;
open my $g, '-|', qw(git show -C --oneline), $id or die;
scan_patches($commits, $id, $g);
close $g;
}
close $f;
}
sub mailmap_contacts {
my ($contacts) = @_;
my %mapped;
my $pid = open2 my $reader, my $writer, qw(git check-mailmap --stdin);
for my $contact (keys(%$contacts)) {
print $writer "$contact\n";
my $canonical = <$reader>;
chomp $canonical;
$mapped{$canonical} += $contacts->{$contact};
}
close $reader;
close $writer;
waitpid($pid, 0);
die "git-check-mailmap error: $?\n" if $?;
return \%mapped;
}
if (!@ARGV) {
die "No input revisions or patch files\n";
}
my (@files, @rev_args);
for (@ARGV) {
if (-e) {
push @files, $_;
} else {
push @rev_args, $_;
}
}
my %sources;
for (@files) {
scan_patch_file(\%sources, $_);
}
if (@rev_args) {
scan_rev_args(\%sources, \@rev_args)
}
my %commits;
blame_sources(\%sources, \%commits);
import_commits(\%commits);
my $contacts = {};
for my $commit (values %commits) {
for my $contact (keys %{$commit->{contacts}}) {
$contacts->{$contact}++;
}
}
$contacts = mailmap_contacts($contacts);
my $ncommits = scalar(keys %commits);
for my $contact (keys %$contacts) {
my $percent = $contacts->{$contact} * 100 / $ncommits;
next if $percent < $min_percent;
print "$contact\n";
}
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