[RFC] scripts/get_maintainer: add emails based on keywords in the patch

[Wolfram Sang]

Make get_maintainer.pl scan the modifying lines of a patch for a list of
keywords and add an associated email if found. The first user is the
devicetree-discuss mailing list which should always be cc'ed if a device tree
property is inserted/removed (keyword 'of_get_property'). This patch is the
result from commit 1965d30356c1c65660ba3330927671cfe81acdd5 entering mainline
which seems to have been missed by all parties interested in the device tree
(and at least had the documentation missing). As adding properties can happen
anywhere and so there is no fitting fileglob, this keyword based approach is
proposed.

Signed-off-by: Wolfram Sang <w.sang at pengutronix.de>
Cc: Joe Perches <joe at perches.com>
Cc: Grant Likely <grant.likely at secretlab.ca>
Cc: Anton Vorontsov <avorontsov at ru.mvista.com>
---
 scripts/get_maintainer.pl |   24 ++++++++++++++++--------
 1 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/scripts/get_maintainer.pl b/scripts/get_maintainer.pl
index cdb44b6..e1150ea 100755
--- a/scripts/get_maintainer.pl
+++ b/scripts/get_maintainer.pl
@@ -44,6 +44,11 @@ my $help = 0;
 
 my $exit = 0;
 
+my %keywords_to_mail = (
+	'of_get_property' => 'L: devicetree-discuss at lists.ozlabs.org',
+);
+my $keywords_to_mail_match = join('|', keys %keywords_to_mail);
+
 my @penguin_chief = ();
 push(@penguin_chief,"Linus Torvalds:torvalds\@linux-foundation.org");
 #Andrew wants in on most everything - 2009/01/14
@@ -188,6 +193,12 @@ if ($email_remove_duplicates) {
 
 my @files = ();
 my @range = ();
+my @email_to = ();
+my @list_to = ();
+my @scm = ();
+my @web = ();
+my @subsystem = ();
+my @status = ();
 
 foreach my $file (@ARGV) {
     ##if $file is a directory and it lacks a trailing slash, add one
@@ -213,7 +224,11 @@ foreach my $file (@ARGV) {
 		if ($email_git_blame) {
 		    push(@range, "$lastfile:$1:$2");
 		}
-	    }
+	    # Check the lines which a patch modifies for keywords; add mail if found.
+	    } elsif (m/^[+-].*($keywords_to_mail_match)/o) {
+		(my $keyword_mail = $keywords_to_mail{$1}) =~ s/^([LM]): //;
+		push( @{ ($1 eq 'L') ? \@list_to : \@email_to }, $keyword_mail );
+	   }
 	}
 	close(PATCH);
 	if ($file_cnt == @files) {
@@ -224,13 +239,6 @@ foreach my $file (@ARGV) {
     }
 }
 
-my @email_to = ();
-my @list_to = ();
-my @scm = ();
-my @web = ();
-my @subsystem = ();
-my @status = ();
-
 # Find responsible parties
 
 foreach my $file (@files) {
-- 
1.6.3.3