scripts/get_maintainer.pl: add .mailmap use, shell and email cleanups

Add reading and using .mailmap file if it exists
Convert address entries in .mailmap to first encountered address
Don't terminate shell commands with \n
Strip characters found after sign-offs by: name <address> [stripped]

Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

scripts/get_maintainer.pl

@@ -152,6 +152,36 @@
 }
 close(MAINT);
 
+my %mailmap;
+
+open(MAILMAP, "<${lk_path}.mailmap") || warn "$P: Can't open .mailmap\n";
+while (<MAILMAP>) {
+    my $line = $_;
+
+    next if ($line =~ m/^\s*#/);
+    next if ($line =~ m/^\s*$/);
+
+    my ($name, $address) = parse_email($line);
+    $line = format_email($name, $address);
+
+    next if ($line =~ m/^\s*$/);
+
+    if (exists($mailmap{$name})) {
+	my $obj = $mailmap{$name};
+	push(@$obj, $address);
+    } else {
+	my @arr = ($address);
+	$mailmap{$name} = \@arr;
+    }
+}
+close(MAILMAP);
+
+foreach my $name (sort {$mailmap{$a} <=> $mailmap{$b}} keys %mailmap) {
+    my $obj = $mailmap{$name};
+    foreach my $address (@$obj) {
+    }
+}
+
 ## use the filenames on the command line or find the filenames in the patchfiles
 
 my @files = ();
@@ -403,12 +433,12 @@ sub parse_email {
     my $name = "";
     my $address = "";
 
-    if ($formatted_email =~ /^([^<]+)<(.*\@.*)>$/) {
+    if ($formatted_email =~ /^([^<]+)<(.*\@.*)>.*$/) {
 	$name = $1;
 	$address = $2;
-    } elsif ($formatted_email =~ /^<(.*\@.*)>$/) {
+    } elsif ($formatted_email =~ /^\s*<(.*\@.*)>.*$/) {
 	$address = $1;
-    } elsif ($formatted_email =~ /^(.*\@.*)$/) {
+    } elsif ($formatted_email =~ /^\s*(.*\@.*)$/) {
 	$address = $1;
     }
 
@@ -557,6 +587,29 @@ sub which {
     return "";
 }
 
+sub mailmap {
+    my @lines = @_;
+    my %hash;
+
+    foreach my $line (@lines) {
+	my ($name, $address) = parse_email($line);
+	if (!exists($hash{$name})) {
+	    $hash{$name} = $address;
+	}
+	if (exists($mailmap{$name})) {
+	    my $obj = $mailmap{$name};
+	    foreach my $map_address (@$obj) {
+		if (($map_address eq $address) &&
+		    ($map_address ne $hash{$name})) {
+		    $line = format_email($name, $hash{$name});
+		}
+	    }
+	}
+    }
+
+    return @lines;
+}
+
 sub recent_git_signoffs {
     my ($file) = @_;
 
@@ -592,9 +645,10 @@ sub recent_git_signoffs {
     # cut -f2- -d":"
     s/.*:\s*(.+)\s*/$1/ for (@lines);
 
+    $total_sign_offs = @lines;
+
     @lines = mailmap(@lines);
 
-    $total_sign_offs = @lines;
     @lines = sort(@lines);
     # uniq -c
     foreach my $line (@lines) {
@@ -655,12 +709,12 @@ sub git_assign_blame {
 	    my $diff_start = $2;
 	    my $diff_length = $3;
 	    next if (!("$file" eq "$diff_file"));
-	    $cmd = "git blame -l -L $diff_start,+$diff_length $file\n";
+	    $cmd = "git blame -l -L $diff_start,+$diff_length $file";
 	    @commits = save_commits($cmd, @commits);
 	}
     } else {
 	if (-f $file) {
-	    $cmd = "git blame -l $file\n";
+	    $cmd = "git blame -l $file";
 	    @commits = save_commits($cmd, @commits);
 	}
     }
@@ -678,11 +732,15 @@ sub git_assign_blame {
 	if (!$email_git_penguin_chiefs) {
 	    @lines = grep(!/${penguin_chiefs}/i, @lines);
 	}
+
 	# cut -f2- -d":"
 	s/.*:\s*(.+)\s*/$1/ for (@lines);
 
-	$hash{$_}++ for @lines;
 	$total_sign_offs += @lines;
+
+	@lines = mailmap(@lines);
+
+	$hash{$_}++ for @lines;
     }
 
     $count = 0;