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-rwxr-xr-xcontrib/contacts/git-contacts203
1 files changed, 203 insertions, 0 deletions
diff --git a/contrib/contacts/git-contacts b/contrib/contacts/git-contacts
new file mode 100755
index 0000000..dbe2abf
--- /dev/null
+++ b/contrib/contacts/git-contacts
@@ -0,0 +1,203 @@
+#!/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 (/^@@ -(\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 $toplevel = `git rev-parse --show-toplevel`;
+chomp $toplevel;
+chdir($toplevel) or die "chdir failure: $toplevel: $!\n";
+
+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";
+}