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-rwxr-xr-xcontrib/contacts/git-contacts127
1 files changed, 127 insertions, 0 deletions
diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
new file mode 100755
index 0000000..3e6cce8
--- /dev/null
+++ b/contrib/contacts/git-contacts
@@ -0,0 +1,127 @@
+#!/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> ...
+
+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, $start, $len, $from) = @_;
+ $len = 1 unless defined($len);
+ return if $len == 0;
+ open my $f, '-|',
+ qw(git blame --porcelain -C), '-L', "$start,+$len",
+ '--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 $f;
+}
+
+sub scan_patches {
+ my ($commits, $f) = @_;
+ my ($id, $source);
+ while (<$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+))?/ && $source) {
+ get_blame($commits, $source, $1, $2, $id);
+ }
+ }
+}
+
+sub scan_patch_file {
+ my ($commits, $file) = @_;
+ open my $f, '<', $file or die "read failure: $file: $!\n";
+ scan_patches($commits, $f);
+ close $f;
+}
+
+if (!@ARGV) {
+ die "No input patch files\n";
+}
+
+my %commits;
+for (@ARGV) {
+ scan_patch_file(\%commits, $_);
+}
+import_commits(\%commits);
+
+my $contacts = {};
+for my $commit (values %commits) {
+ for my $contact (keys %{$commit->{contacts}}) {
+ $contacts->{$contact}++;
+ }
+}
+
+my $ncommits = scalar(keys %commits);
+for my $contact (keys %$contacts) {
+ my $percent = $contacts->{$contact} * 100 / $ncommits;
+ next if $percent < $min_percent;
+ print "$contact\n";
+}