get_maintainer: add --json output mode

Add a --json flag to get_maintainer.pl that emits structured JSON output,
making results machine-parseable for CI systems, IDE integrations, and
AI-assisted development tools.

The JSON output includes a maintainers array with structured name, email,
and role fields, plus optional arrays for scm, status, subsystem, web, and
bug information when those flags are enabled.

Normal text output behavior is completely unchanged when --json is not
specified.

Assisted-by: Claude:claude-opus-4-6
Link: https://lore.kernel.org/20260408194542.1354549-1-sashal@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index f0ca0db6ddc274225f6a90ab7b81e52cfd612e66..16b80a700d4ac7fbabfd4b2dd3e9ac288aac3b84 100755 (executable)
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -21,6 +21,7 @@ use Cwd;
 use File::Find;
 use File::Spec::Functions;
 use open qw(:std :encoding(UTF-8));
+use JSON::PP;
 
 my $cur_path = fastgetcwd() . '/';
 my $lk_path = "./";
@@ -68,6 +69,7 @@ my $pattern_depth = 0;
 my $self_test = undef;
 my $version = 0;
 my $help = 0;
+my $json = 0;
 my $find_maintainer_files = 0;
 my $maintainer_path;
 my $vcs_used = 0;
@@ -285,6 +287,7 @@ if (!GetOptions(
                'find-maintainer-files' => \$find_maintainer_files,
                'mpath|maintainer-path=s' => \$maintainer_path,
                'self-test:s' => \$self_test,
+               'json!' => \$json,
                'v|version' => \$version,
                'h|help|usage' => \$help,
                )) {
@@ -650,39 +653,48 @@ my %deduplicate_name_hash = ();
 my %deduplicate_address_hash = ();
 
 my @maintainers = get_maintainers();
-if (@maintainers) {
-    @maintainers = merge_email(@maintainers);
-    output(@maintainers);
-}
-
-if ($scm) {
-    @scm = uniq(@scm);
-    output(@scm);
-}
-
-if ($output_substatus) {
-    @substatus = uniq(@substatus);
-    output(@substatus);
-}
-
-if ($status) {
-    @status = uniq(@status);
-    output(@status);
-}
 
-if ($subsystem) {
-    @subsystem = uniq(@subsystem);
-    output(@subsystem);
-}
+@maintainers = merge_email(@maintainers) if (@maintainers);
+@scm = uniq(@scm) if ($scm);
+@substatus = uniq(@substatus) if ($output_substatus);
+@status = uniq(@status) if ($status);
+@subsystem = uniq(@subsystem) if ($subsystem);
+@web = uniq(@web) if ($web);
+@bug = uniq(@bug) if ($bug);
+
+if ($json) {
+    my @json_maintainers;
+    for my $m (@maintainers) {
+       my ($addr, $role);
+       if ($output_roles && $m =~ /^(.*?)\s+\((.+)\)\s*$/) {
+           $addr = $1;
+           $role = $2;
+       } else {
+           $addr = $m;
+       }
+       my ($name, $email_addr) = parse_email($addr);
+       my %entry = (name => $name, email => $email_addr);
+       $entry{role} = $role if (defined $role && $role ne '');
+       push(@json_maintainers, \%entry);
+    }
 
-if ($web) {
-    @web = uniq(@web);
-    output(@web);
-}
+    my %result = (maintainers => \@json_maintainers);
+    $result{scm} = \@scm if ($scm);
+    $result{status} = \@status if ($status);
+    $result{subsystem} = \@subsystem if ($subsystem);
+    $result{web} = \@web if ($web);
+    $result{bug} = \@bug if ($bug);
 
-if ($bug) {
-    @bug = uniq(@bug);
-    output(@bug);
+    my $json_encoder = JSON::PP->new->canonical->utf8;
+    print($json_encoder->encode(\%result) . "\n");
+} else {
+    output(@maintainers) if (@maintainers);
+    output(@scm) if ($scm);
+    output(@substatus) if ($output_substatus);
+    output(@status) if ($status);
+    output(@subsystem) if ($subsystem);
+    output(@web) if ($web);
+    output(@bug) if ($bug);
 }
 
 exit($exit);
@@ -1104,6 +1116,7 @@ Output type options:
   --separator [, ] => separator for multiple entries on 1 line
     using --separator also sets --nomultiline if --separator is not [, ]
   --multiline => print 1 entry per line
+  --json => output results as JSON
 
 Other options:
   --pattern-depth => Number of pattern directory traversals (default: 0 (all))