1 files changed, 117 insertions, 23 deletions

diff --git a/scripts/parse-maintainers.pl b/scripts/parse-maintainers.pl
index a0fe34349b24..255cef1b098d 100644
--- a/scripts/parse-maintainers.pl
+++ b/scripts/parse-maintainers.pl
@@ -1,10 +1,46 @@
 #!/usr/bin/perl -w
+# SPDX-License-Identifier: GPL-2.0
 
 use strict;
+use Getopt::Long qw(:config no_auto_abbrev);
 
-my %map;
+my $input_file = "MAINTAINERS";
+my $output_file = "MAINTAINERS.new";
+my $output_section = "SECTION.new";
+my $help = 0;
 
-# sort comparison function
+my $P = $0;
+
+if (!GetOptions(
+		'input=s' => \$input_file,
+		'output=s' => \$output_file,
+		'section=s' => \$output_section,
+		'h|help|usage' => \$help,
+	    )) {
+    die "$P: invalid argument - use --help if necessary\n";
+}
+
+if ($help != 0) {
+    usage();
+    exit 0;
+}
+
+sub usage {
+    print <<EOT;
+usage: $P [options] <pattern matching regexes>
+
+  --input => MAINTAINERS file to read (default: MAINTAINERS)
+  --output => sorted MAINTAINERS file to write (default: MAINTAINERS.new)
+  --section => new sorted MAINTAINERS file to write to (default: SECTION.new)
+
+If <pattern match regexes> exist, then the sections that match the
+regexes are not written to the output file but are written to the
+section file.
+
+EOT
+}
+
+# sort comparison functions
 sub by_category($$) {
     my ($a, $b) = @_;
 
@@ -15,20 +51,33 @@ sub by_category($$) {
     $a =~ s/THE REST/ZZZZZZ/g;
     $b =~ s/THE REST/ZZZZZZ/g;
 
-    $a cmp $b;
+    return $a cmp $b;
 }
 
-sub alpha_output {
-    my $key;
-    my $sort_method = \&by_category;
-    my $sep = "";
-
-    foreach $key (sort $sort_method keys %map) {
-        if ($key ne " ") {
-            print $sep . $key . "\n";
-            $sep = "\n";
-        }
-        print $map{$key};
+sub by_pattern($$) {
+    my ($a, $b) = @_;
+    my $preferred_order = 'MRPLSWTQBCFXNK';
+
+    my $a1 = uc(substr($a, 0, 1));
+    my $b1 = uc(substr($b, 0, 1));
+
+    my $a_index = index($preferred_order, $a1);
+    my $b_index = index($preferred_order, $b1);
+
+    $a_index = 1000 if ($a_index == -1);
+    $b_index = 1000 if ($b_index == -1);
+
+    if (($a1 =~ /^F$/ && $b1 =~ /^F$/) ||
+	($a1 =~ /^X$/ && $b1 =~ /^X$/)) {
+	return $a cmp $b;
+    }
+
+    if ($a_index < $b_index) {
+	return -1;
+    } elsif ($a_index == $b_index) {
+	return 0;
+    } else {
+	return 1;
     }
 }
 
@@ -39,39 +88,84 @@ sub trim {
     return $s;
 }
 
+sub alpha_output {
+    my ($hashref, $filename) = (@_);
+
+    return if ! scalar(keys %$hashref);
+
+    open(my $file, '>', "$filename") or die "$P: $filename: open failed - $!\n";
+    my $separator;
+    foreach my $key (sort by_category keys %$hashref) {
+	if ($key eq " ") {
+	    print $file $$hashref{$key};
+	} else {
+	    if (! defined $separator) {
+		$separator = "\n";
+	    } else {
+		print $file $separator;
+	    }
+	    print $file $key . "\n";
+	    foreach my $pattern (sort by_pattern split('\n', %$hashref{$key})) {
+		print $file ($pattern . "\n");
+	    }
+	}
+    }
+    close($file);
+}
+
 sub file_input {
+    my ($hashref, $filename) = (@_);
+
     my $lastline = "";
     my $case = " ";
-    $map{$case} = "";
+    $$hashref{$case} = "";
+
+    open(my $file, '<', "$filename") or die "$P: $filename: open failed - $!\n";
 
-    while (<>) {
+    while (<$file>) {
         my $line = $_;
 
         # Pattern line?
         if ($line =~ m/^([A-Z]):\s*(.*)/) {
             $line = $1 . ":\t" . trim($2) . "\n";
             if ($lastline eq "") {
-                $map{$case} = $map{$case} . $line;
+                $$hashref{$case} = $$hashref{$case} . $line;
                 next;
             }
             $case = trim($lastline);
-            exists $map{$case} and die "Header '$case' already exists";
-            $map{$case} = $line;
+            exists $$hashref{$case} and die "Header '$case' already exists";
+            $$hashref{$case} = $line;
             $lastline = "";
             next;
         }
 
         if ($case eq " ") {
-            $map{$case} = $map{$case} . $lastline;
+            $$hashref{$case} = $$hashref{$case} . $lastline;
             $lastline = $line;
             next;
         }
         trim($lastline) eq "" or die ("Odd non-pattern line '$lastline' for '$case'");
         $lastline = $line;
     }
-    $map{$case} = $map{$case} . $lastline;
+    $$hashref{$case} = $$hashref{$case} . $lastline;
+    close($file);
+}
+
+my %hash;
+my %new_hash;
+
+file_input(\%hash, $input_file);
+
+foreach my $type (@ARGV) {
+    foreach my $key (keys %hash) {
+	if ($key =~ /$type/ || $hash{$key} =~ /$type/) {
+	    $new_hash{$key} = $hash{$key};
+	    delete $hash{$key};
+	}
+    }
 }
 
-&file_input;
-&alpha_output;
+alpha_output(\%hash, $output_file);
+alpha_output(\%new_hash, $output_section);
+
 exit(0);