Archipelago » qemu

#!/usr/bin/perl -w

# (c) 2007, Joe Perches <joe@perches.com>

#           created from checkpatch.pl

#

# Print selected MAINTAINERS information for

# the files modified in a patch or for a file

#

# usage: perl scripts/get_maintainer.pl [OPTIONS] <patch>

#        perl scripts/get_maintainer.pl [OPTIONS] -f <file>

#

# Licensed under the terms of the GNU GPL License version 2

use strict;

my $P = $0;

my $V = '0.26';

use Getopt::Long qw(:config no_auto_abbrev);

my $lk_path = "./";

my $email = 1;

my $email_usename = 1;

my $email_maintainer = 1;

my $email_list = 1;

my $email_subscriber_list = 0;

my $email_git_penguin_chiefs = 0;

my $email_git = 0;

my $email_git_all_signature_types = 0;

my $email_git_blame = 0;

my $email_git_blame_signatures = 1;

my $email_git_fallback = 1;

my $email_git_min_signatures = 1;

my $email_git_max_maintainers = 5;

my $email_git_min_percent = 5;

my $email_git_since = "1-year-ago";

my $email_hg_since = "-365";

my $interactive = 0;

my $email_remove_duplicates = 1;

my $email_use_mailmap = 1;

my $output_multiline = 1;

my $output_separator = ", ";

my $output_roles = 0;

my $output_rolestats = 1;

my $scm = 0;

my $web = 0;

my $subsystem = 0;

my $status = 0;

my $keywords = 1;

my $sections = 0;

my $file_emails = 0;

my $from_filename = 0;

my $pattern_depth = 0;

my $version = 0;

my $help = 0;

my $vcs_used = 0;

my $exit = 0;

my %commit_author_hash;

my %commit_signer_hash;

my @penguin_chief = ();

push(@penguin_chief, "Linus Torvalds:torvalds\@linux-foundation.org");

#Andrew wants in on most everything - 2009/01/14

#push(@penguin_chief, "Andrew Morton:akpm\@linux-foundation.org");

my @penguin_chief_names = ();

foreach my $chief (@penguin_chief) {

    if ($chief =~ m/^(.*):(.*)/) {

	my $chief_name = $1;

	my $chief_addr = $2;

	push(@penguin_chief_names, $chief_name);

    }

}

my $penguin_chiefs = "\(" . join("|", @penguin_chief_names) . "\)";

# Signature types of people who are either

# 	a) responsible for the code in question, or

# 	b) familiar enough with it to give relevant feedback

my @signature_tags = ();

push(@signature_tags, "Signed-off-by:");

push(@signature_tags, "Reviewed-by:");

push(@signature_tags, "Acked-by:");

my $signature_pattern = "\(" . join("|", @signature_tags) . "\)";

# rfc822 email address - preloaded methods go here.

my $rfc822_lwsp = "(?:(?:\\r\\n)?[ \\t])";

my $rfc822_char = '[\\000-\\377]';

# VCS command support: class-like functions and strings

my %VCS_cmds;

my %VCS_cmds_git = (

    "execute_cmd" => \&git_execute_cmd,

    "available" => '(which("git") ne "") && (-d ".git")',

    "find_signers_cmd" =>

	"git log --no-color --follow --since=\$email_git_since " .

	    '--format="GitCommit: %H%n' .

		      'GitAuthor: %an <%ae>%n' .

		      'GitDate: %aD%n' .

		      'GitSubject: %s%n' .

		      '%b%n"' .

	    " -- \$file",

    "find_commit_signers_cmd" =>

	"git log --no-color " .

	    '--format="GitCommit: %H%n' .

		      'GitAuthor: %an <%ae>%n' .

		      'GitDate: %aD%n' .

		      'GitSubject: %s%n' .

		      '%b%n"' .

	    " -1 \$commit",

    "find_commit_author_cmd" =>

	"git log --no-color " .

	    '--format="GitCommit: %H%n' .

		      'GitAuthor: %an <%ae>%n' .

		      'GitDate: %aD%n' .

		      'GitSubject: %s%n"' .

	    " -1 \$commit",

    "blame_range_cmd" => "git blame -l -L \$diff_start,+\$diff_length \$file",

    "blame_file_cmd" => "git blame -l \$file",

    "commit_pattern" => "^GitCommit: ([0-9a-f]{40,40})",

    "blame_commit_pattern" => "^([0-9a-f]+) ",

    "author_pattern" => "^GitAuthor: (.*)",

    "subject_pattern" => "^GitSubject: (.*)",

);

my %VCS_cmds_hg = (

    "execute_cmd" => \&hg_execute_cmd,

    "available" => '(which("hg") ne "") && (-d ".hg")',

    "find_signers_cmd" =>

	"hg log --date=\$email_hg_since " .

	    "--template='HgCommit: {node}\\n" .

	                "HgAuthor: {author}\\n" .

			"HgSubject: {desc}\\n'" .

	    " -- \$file",

    "find_commit_signers_cmd" =>

	"hg log " .

	    "--template='HgSubject: {desc}\\n'" .

	    " -r \$commit",

    "find_commit_author_cmd" =>

	"hg log " .

	    "--template='HgCommit: {node}\\n" .

		        "HgAuthor: {author}\\n" .

			"HgSubject: {desc|firstline}\\n'" .

	    " -r \$commit",

    "blame_range_cmd" => "",		# not supported

    "blame_file_cmd" => "hg blame -n \$file",

    "commit_pattern" => "^HgCommit: ([0-9a-f]{40,40})",

    "blame_commit_pattern" => "^([ 0-9a-f]+):",

    "author_pattern" => "^HgAuthor: (.*)",

    "subject_pattern" => "^HgSubject: (.*)",

);

my $conf = which_conf(".get_maintainer.conf");

if (-f $conf) {

    my @conf_args;

    open(my $conffile, '<', "$conf")

	or warn "$P: Can't find a readable .get_maintainer.conf file $!\n";

    while (<$conffile>) {

	my $line = $_;

	$line =~ s/\s*\n?$//g;

	$line =~ s/^\s*//g;

	$line =~ s/\s+/ /g;

	next if ($line =~ m/^\s*#/);

	next if ($line =~ m/^\s*$/);

	my @words = split(" ", $line);

	foreach my $word (@words) {

	    last if ($word =~ m/^#/);

	    push (@conf_args, $word);

	}

    }

    close($conffile);

    unshift(@ARGV, @conf_args) if @conf_args;

}

if (!GetOptions(

		'email!' => \$email,

		'git!' => \$email_git,

		'git-all-signature-types!' => \$email_git_all_signature_types,

		'git-blame!' => \$email_git_blame,

		'git-blame-signatures!' => \$email_git_blame_signatures,

		'git-fallback!' => \$email_git_fallback,

		'git-chief-penguins!' => \$email_git_penguin_chiefs,

		'git-min-signatures=i' => \$email_git_min_signatures,

		'git-max-maintainers=i' => \$email_git_max_maintainers,

		'git-min-percent=i' => \$email_git_min_percent,

		'git-since=s' => \$email_git_since,

		'hg-since=s' => \$email_hg_since,

		'i|interactive!' => \$interactive,

		'remove-duplicates!' => \$email_remove_duplicates,

		'mailmap!' => \$email_use_mailmap,

		'm!' => \$email_maintainer,

		'n!' => \$email_usename,

		'l!' => \$email_list,

		's!' => \$email_subscriber_list,

		'multiline!' => \$output_multiline,

		'roles!' => \$output_roles,

		'rolestats!' => \$output_rolestats,

		'separator=s' => \$output_separator,

		'subsystem!' => \$subsystem,

		'status!' => \$status,

		'scm!' => \$scm,

		'web!' => \$web,

		'pattern-depth=i' => \$pattern_depth,

		'k|keywords!' => \$keywords,

		'sections!' => \$sections,

		'fe|file-emails!' => \$file_emails,

		'f|file' => \$from_filename,

		'v|version' => \$version,

		'h|help|usage' => \$help,

		)) {

    die "$P: invalid argument - use --help if necessary\n";

}

if ($help != 0) {

    usage();

    exit 0;

}

if ($version != 0) {

    print("${P} ${V}\n");

    exit 0;

}

if (-t STDIN && !@ARGV) {

    # We're talking to a terminal, but have no command line arguments.

    die "$P: missing patchfile or -f file - use --help if necessary\n";

}

$output_multiline = 0 if ($output_separator ne ", ");

$output_rolestats = 1 if ($interactive);

$output_roles = 1 if ($output_rolestats);

if ($sections) {

    $email = 0;

    $email_list = 0;

    $scm = 0;

    $status = 0;

    $subsystem = 0;

    $web = 0;

    $keywords = 0;

    $interactive = 0;

} else {

    my $selections = $email + $scm + $status + $subsystem + $web;

    if ($selections == 0) {

	die "$P:  Missing required option: email, scm, status, subsystem or web\n";

    }

}

if ($email &&

    ($email_maintainer + $email_list + $email_subscriber_list +

     $email_git + $email_git_penguin_chiefs + $email_git_blame) == 0) {

    die "$P: Please select at least 1 email option\n";

}

if (!top_of_tree($lk_path)) {

    die "$P: The current directory does not appear to be "

	. "a QEMU source tree.\n";

}

## Read MAINTAINERS for type/value pairs

my @typevalue = ();

my %keyword_hash;

open (my $maint, '<', "${lk_path}MAINTAINERS")

    or die "$P: Can't open MAINTAINERS: $!\n";

while (<$maint>) {

    my $line = $_;

    if ($line =~ m/^(\C):\s*(.*)/) {

	my $type = $1;

	my $value = $2;

	##Filename pattern matching

	if ($type eq "F" || $type eq "X") {

	    $value =~ s@\.@\\\.@g;       ##Convert . to \.

	    $value =~ s/\*/\.\*/g;       ##Convert * to .*

	    $value =~ s/\?/\./g;         ##Convert ? to .

	    ##if pattern is a directory and it lacks a trailing slash, add one

	    if ((-d $value)) {

		$value =~ s@([^/])$@$1/@;

	    }

	} elsif ($type eq "K") {

	    $keyword_hash{@typevalue} = $value;

	}

	push(@typevalue, "$type:$value");

    } elsif (!/^(\s)*$/) {

	$line =~ s/\n$//g;

	push(@typevalue, $line);

    }

}

close($maint);

#

# Read mail address map

#

my $mailmap;

read_mailmap();

sub read_mailmap {

    $mailmap = {

	names => {},

	addresses => {}

    };

    return if (!$email_use_mailmap || !(-f "${lk_path}.mailmap"));

    open(my $mailmap_file, '<', "${lk_path}.mailmap")

	or warn "$P: Can't open .mailmap: $!\n";

    while (<$mailmap_file>) {

	s/#.*$//; #strip comments

	s/^\s+|\s+$//g; #trim

	next if (/^\s*$/); #skip empty lines

	#entries have one of the following formats:

	# name1 <mail1>

	# <mail1> <mail2>

	# name1 <mail1> <mail2>

	# name1 <mail1> name2 <mail2>

	# (see man git-shortlog)

	if (/^([^<]+)<([^>]+)>$/) {

	    my $real_name = $1;

	    my $address = $2;

	    $real_name =~ s/\s+$//;

	    ($real_name, $address) = parse_email("$real_name <$address>");

	    $mailmap->{names}->{$address} = $real_name;

	} elsif (/^<([^>]+)>\s*<([^>]+)>$/) {

	    my $real_address = $1;

	    my $wrong_address = $2;

	    $mailmap->{addresses}->{$wrong_address} = $real_address;

	} elsif (/^(.+)<([^>]+)>\s*<([^>]+)>$/) {

	    my $real_name = $1;

	    my $real_address = $2;

	    my $wrong_address = $3;

	    $real_name =~ s/\s+$//;

	    ($real_name, $real_address) =

		parse_email("$real_name <$real_address>");

	    $mailmap->{names}->{$wrong_address} = $real_name;

	    $mailmap->{addresses}->{$wrong_address} = $real_address;

	} elsif (/^(.+)<([^>]+)>\s*(.+)\s*<([^>]+)>$/) {

	    my $real_name = $1;

	    my $real_address = $2;

	    my $wrong_name = $3;

	    my $wrong_address = $4;

	    $real_name =~ s/\s+$//;

	    ($real_name, $real_address) =

		parse_email("$real_name <$real_address>");

	    $wrong_name =~ s/\s+$//;

	    ($wrong_name, $wrong_address) =

		parse_email("$wrong_name <$wrong_address>");

	    my $wrong_email = format_email($wrong_name, $wrong_address, 1);

	    $mailmap->{names}->{$wrong_email} = $real_name;

	    $mailmap->{addresses}->{$wrong_email} = $real_address;

	}

    }

    close($mailmap_file);

}

## use the filenames on the command line or find the filenames in the patchfiles

my @files = ();

my @range = ();

my @keyword_tvi = ();

my @file_emails = ();

if (!@ARGV) {

    push(@ARGV, "&STDIN");

}

foreach my $file (@ARGV) {

    if ($file ne "&STDIN") {

	##if $file is a directory and it lacks a trailing slash, add one

	if ((-d $file)) {

	    $file =~ s@([^/])$@$1/@;

	} elsif (!(-f $file)) {

	    die "$P: file '${file}' not found\n";

	}

    }

    if ($from_filename) {

	push(@files, $file);

	if ($file ne "MAINTAINERS" && -f $file && ($keywords || $file_emails)) {

	    open(my $f, '<', $file)

		or die "$P: Can't open $file: $!\n";

	    my $text = do { local($/) ; <$f> };

	    close($f);

	    if ($keywords) {

		foreach my $line (keys %keyword_hash) {

		    if ($text =~ m/$keyword_hash{$line}/x) {

			push(@keyword_tvi, $line);

		    }

		}

	    }

	    if ($file_emails) {

		my @poss_addr = $text =~ m$[A-Za-zÀ-ÿ\"\' \,\.\+-]*\s*[\,]*\s*[\(\<\{]{0,1}[A-Za-z0-9_\.\+-]+\@[A-Za-z0-9\.-]+\.[A-Za-z0-9]+[\)\>\}]{0,1}$g;

		push(@file_emails, clean_file_emails(@poss_addr));

	    }

	}

    } else {

	my $file_cnt = @files;

	my $lastfile;

	open(my $patch, "< $file")

	    or die "$P: Can't open $file: $!\n";

	# We can check arbitrary information before the patch

	# like the commit message, mail headers, etc...

	# This allows us to match arbitrary keywords against any part

	# of a git format-patch generated file (subject tags, etc...)

	my $patch_prefix = "";			#Parsing the intro

	while (<$patch>) {

	    my $patch_line = $_;

	    if (m/^\+\+\+\s+(\S+)/) {

		my $filename = $1;

		$filename =~ s@^[^/]*/@@;

		$filename =~ s@\n@@;

		$lastfile = $filename;

		push(@files, $filename);

		$patch_prefix = "^[+-].*";	#Now parsing the actual patch

	    } elsif (m/^\@\@ -(\d+),(\d+)/) {

		if ($email_git_blame) {

		    push(@range, "$lastfile:$1:$2");

		}

	    } elsif ($keywords) {

		foreach my $line (keys %keyword_hash) {

		    if ($patch_line =~ m/${patch_prefix}$keyword_hash{$line}/x) {

			push(@keyword_tvi, $line);

		    }

		}

	    }

	}

	close($patch);

	if ($file_cnt == @files) {

	    warn "$P: file '${file}' doesn't appear to be a patch.  "

		. "Add -f to options?\n";

	}

	@files = sort_and_uniq(@files);

    }

}

@file_emails = uniq(@file_emails);

my %email_hash_name;

my %email_hash_address;

my @email_to = ();

my %hash_list_to;

my @list_to = ();

my @scm = ();

my @web = ();

my @subsystem = ();

my @status = ();

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 ($status) {

    @status = uniq(@status);

    output(@status);

}

if ($subsystem) {

    @subsystem = uniq(@subsystem);

    output(@subsystem);

}

if ($web) {

    @web = uniq(@web);

    output(@web);

}

exit($exit);

sub range_is_maintained {

    my ($start, $end) = @_;

    for (my $i = $start; $i < $end; $i++) {

	my $line = $typevalue[$i];

	if ($line =~ m/^(\C):\s*(.*)/) {

	    my $type = $1;

	    my $value = $2;

	    if ($type eq 'S') {

		if ($value =~ /(maintain|support)/i) {

		    return 1;

		}

	    }

	}

    }

    return 0;

}

sub range_has_maintainer {

    my ($start, $end) = @_;

    for (my $i = $start; $i < $end; $i++) {

	my $line = $typevalue[$i];

	if ($line =~ m/^(\C):\s*(.*)/) {

	    my $type = $1;

	    my $value = $2;

	    if ($type eq 'M') {

		return 1;

	    }

	}

    }

    return 0;

}

sub get_maintainers {

    %email_hash_name = ();

    %email_hash_address = ();

    %commit_author_hash = ();

    %commit_signer_hash = ();

    @email_to = ();

    %hash_list_to = ();

    @list_to = ();

    @scm = ();

    @web = ();

    @subsystem = ();

    @status = ();

    %deduplicate_name_hash = ();

    %deduplicate_address_hash = ();

    if ($email_git_all_signature_types) {

	$signature_pattern = "(.+?)[Bb][Yy]:";

    } else {

	$signature_pattern = "\(" . join("|", @signature_tags) . "\)";

    }

    # Find responsible parties

    my %exact_pattern_match_hash = ();

    foreach my $file (@files) {

	my %hash;

	my $tvi = find_first_section();

	while ($tvi < @typevalue) {

	    my $start = find_starting_index($tvi);

	    my $end = find_ending_index($tvi);

	    my $exclude = 0;

	    my $i;

	    #Do not match excluded file patterns

	    for ($i = $start; $i < $end; $i++) {

		my $line = $typevalue[$i];

		if ($line =~ m/^(\C):\s*(.*)/) {

		    my $type = $1;

		    my $value = $2;

		    if ($type eq 'X') {

			if (file_match_pattern($file, $value)) {

			    $exclude = 1;

			    last;

			}

		    }

		}

	    }

	    if (!$exclude) {

		for ($i = $start; $i < $end; $i++) {

		    my $line = $typevalue[$i];

		    if ($line =~ m/^(\C):\s*(.*)/) {

			my $type = $1;

			my $value = $2;

			if ($type eq 'F') {

			    if (file_match_pattern($file, $value)) {

				my $value_pd = ($value =~ tr@/@@);

				my $file_pd = ($file  =~ tr@/@@);

				$value_pd++ if (substr($value,-1,1) ne "/");

				$value_pd = -1 if ($value =~ /^\.\*/);

				if ($value_pd >= $file_pd &&

				    range_is_maintained($start, $end) &&

				    range_has_maintainer($start, $end)) {

				    $exact_pattern_match_hash{$file} = 1;

				}

				if ($pattern_depth == 0 ||

				    (($file_pd - $value_pd) < $pattern_depth)) {

				    $hash{$tvi} = $value_pd;

				}

			    }

			}

		    }

		}

	    }

	    $tvi = $end + 1;

	}

	foreach my $line (sort {$hash{$b} <=> $hash{$a}} keys %hash) {

	    add_categories($line);

	    if ($sections) {

		my $i;

		my $start = find_starting_index($line);

		my $end = find_ending_index($line);

		for ($i = $start; $i < $end; $i++) {

		    my $line = $typevalue[$i];

		    if ($line =~ /^[FX]:/) {		##Restore file patterns

			$line =~ s/([^\\])\.([^\*])/$1\?$2/g;

			$line =~ s/([^\\])\.$/$1\?/g;	##Convert . back to ?

			$line =~ s/\\\./\./g;       	##Convert \. to .

			$line =~ s/\.\*/\*/g;       	##Convert .* to *

		    }

		    $line =~ s/^([A-Z]):/$1:\t/g;

		    print("$line\n");

		}

		print("\n");

	    }

	}

    }

    if ($keywords) {

	@keyword_tvi = sort_and_uniq(@keyword_tvi);

	foreach my $line (@keyword_tvi) {

	    add_categories($line);

	}

    }

    foreach my $email (@email_to, @list_to) {

	$email->[0] = deduplicate_email($email->[0]);

    }

    foreach my $file (@files) {

	if ($email &&

	    ($email_git || ($email_git_fallback &&

			    !$exact_pattern_match_hash{$file}))) {

	    vcs_file_signoffs($file);

	}

	if ($email && $email_git_blame) {

	    vcs_file_blame($file);

	}

    }

    if ($email) {

	foreach my $chief (@penguin_chief) {

	    if ($chief =~ m/^(.*):(.*)/) {

		my $email_address;

		$email_address = format_email($1, $2, $email_usename);

		if ($email_git_penguin_chiefs) {

		    push(@email_to, [$email_address, 'chief penguin']);

		} else {

		    @email_to = grep($_->[0] !~ /${email_address}/, @email_to);

		}

	    }

	}

	foreach my $email (@file_emails) {

	    my ($name, $address) = parse_email($email);

	    my $tmp_email = format_email($name, $address, $email_usename);

	    push_email_address($tmp_email, '');

	    add_role($tmp_email, 'in file');

	}

    }

    my @to = ();

    if ($email || $email_list) {

	if ($email) {

	    @to = (@to, @email_to);

	}

	if ($email_list) {

	    @to = (@to, @list_to);

	}

    }

    if ($interactive) {

	@to = interactive_get_maintainers(\@to);

    }

    return @to;

}

sub file_match_pattern {

    my ($file, $pattern) = @_;

    if (substr($pattern, -1) eq "/") {

	if ($file =~ m@^$pattern@) {

	    return 1;

	}

    } else {

	if ($file =~ m@^$pattern@) {

	    my $s1 = ($file =~ tr@/@@);

	    my $s2 = ($pattern =~ tr@/@@);

	    if ($s1 == $s2) {

		return 1;

	    }

	}

    }

    return 0;

}

sub usage {

    print <<EOT;

usage: $P [options] patchfile

       $P [options] -f file|directory

version: $V

MAINTAINER field selection options:

  --email => print email address(es) if any

    --git => include recent git \*-by: signers

    --git-all-signature-types => include signers regardless of signature type

        or use only ${signature_pattern} signers (default: $email_git_all_signature_types)

    --git-fallback => use git when no exact MAINTAINERS pattern (default: $email_git_fallback)

    --git-chief-penguins => include ${penguin_chiefs}

    --git-min-signatures => number of signatures required (default: $email_git_min_signatures)

    --git-max-maintainers => maximum maintainers to add (default: $email_git_max_maintainers)

    --git-min-percent => minimum percentage of commits required (default: $email_git_min_percent)

    --git-blame => use git blame to find modified commits for patch or file

    --git-since => git history to use (default: $email_git_since)

    --hg-since => hg history to use (default: $email_hg_since)

    --interactive => display a menu (mostly useful if used with the --git option)

    --m => include maintainer(s) if any

    --n => include name 'Full Name <addr\@domain.tld>'

    --l => include list(s) if any

    --s => include subscriber only list(s) if any

    --remove-duplicates => minimize duplicate email names/addresses

    --roles => show roles (status:subsystem, git-signer, list, etc...)

    --rolestats => show roles and statistics (commits/total_commits, %)

    --file-emails => add email addresses found in -f file (default: 0 (off))

  --scm => print SCM tree(s) if any

  --status => print status if any

  --subsystem => print subsystem name if any

  --web => print website(s) if any

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

Other options:

  --pattern-depth => Number of pattern directory traversals (default: 0 (all))

  --keywords => scan patch for keywords (default: $keywords)

  --sections => print all of the subsystem sections with pattern matches

  --mailmap => use .mailmap file (default: $email_use_mailmap)

  --version => show version

  --help => show this help information

Default options:

  [--email --nogit --git-fallback --m --n --l --multiline -pattern-depth=0

   --remove-duplicates --rolestats]

Notes:

  Using "-f directory" may give unexpected results:

      Used with "--git", git signators for _all_ files in and below

          directory are examined as git recurses directories.

          Any specified X: (exclude) pattern matches are _not_ ignored.

      Used with "--nogit", directory is used as a pattern match,

          no individual file within the directory or subdirectory

          is matched.

      Used with "--git-blame", does not iterate all files in directory

  Using "--git-blame" is slow and may add old committers and authors

      that are no longer active maintainers to the output.

  Using "--roles" or "--rolestats" with git send-email --cc-cmd or any

      other automated tools that expect only ["name"] <email address>

      may not work because of additional output after <email address>.

  Using "--rolestats" and "--git-blame" shows the #/total=% commits,

      not the percentage of the entire file authored.  # of commits is

      not a good measure of amount of code authored.  1 major commit may

      contain a thousand lines, 5 trivial commits may modify a single line.

  If git is not installed, but mercurial (hg) is installed and an .hg

      repository exists, the following options apply to mercurial:

          --git,

          --git-min-signatures, --git-max-maintainers, --git-min-percent, and

          --git-blame

      Use --hg-since not --git-since to control date selection

  File ".get_maintainer.conf", if it exists in the QEMU source root

      directory, can change whatever get_maintainer defaults are desired.

      Entries in this file can be any command line argument.

      This file is prepended to any additional command line arguments.

      Multiple lines and # comments are allowed.

EOT

}

sub top_of_tree {

    my ($lk_path) = @_;

    if ($lk_path ne "" && substr($lk_path,length($lk_path)-1,1) ne "/") {

	$lk_path .= "/";

    }

    if (    (-f "${lk_path}COPYING")

        && (-f "${lk_path}MAINTAINERS")

        && (-f "${lk_path}Makefile")

        && (-d "${lk_path}docs")

        && (-f "${lk_path}VERSION")

        && (-f "${lk_path}vl.c")) {

	return 1;

    }

    return 0;

}

sub parse_email {

    my ($formatted_email) = @_;

    my $name = "";

    my $address = "";

    if ($formatted_email =~ /^([^<]+)<(.+\@.*)>.*$/) {

	$name = $1;

	$address = $2;

    } elsif ($formatted_email =~ /^\s*<(.+\@\S*)>.*$/) {

	$address = $1;

    } elsif ($formatted_email =~ /^(.+\@\S*).*$/) {

	$address = $1;

    }

    $name =~ s/^\s+|\s+$//g;

    $name =~ s/^\"|\"$//g;

    $address =~ s/^\s+|\s+$//g;

    if ($name =~ /[^\w \-]/i) {  	 ##has "must quote" chars

	$name =~ s/(?<!\\)"/\\"/g;       ##escape quotes

	$name = "\"$name\"";

    }

    return ($name, $address);

}

sub format_email {

    my ($name, $address, $usename) = @_;

    my $formatted_email;

    $name =~ s/^\s+|\s+$//g;

    $name =~ s/^\"|\"$//g;

    $address =~ s/^\s+|\s+$//g;

    if ($name =~ /[^\w \-]/i) {          ##has "must quote" chars

	$name =~ s/(?<!\\)"/\\"/g;       ##escape quotes

	$name = "\"$name\"";

    }

    if ($usename) {

	if ("$name" eq "") {

	    $formatted_email = "$address";

	} else {

	    $formatted_email = "$name <$address>";

	}

    } else {

	$formatted_email = $address;

    }

    return $formatted_email;

}

sub find_first_section {

    my $index = 0;

    while ($index < @typevalue) {

	my $tv = $typevalue[$index];

	if (($tv =~ m/^(\C):\s*(.*)/)) {

	    last;

	}

	$index++;

    }

    return $index;

}

sub find_starting_index {

    my ($index) = @_;

    while ($index > 0) {

	my $tv = $typevalue[$index];

	if (!($tv =~ m/^(\C):\s*(.*)/)) {

	    last;

	}

	$index--;

    }

    return $index;

}

sub find_ending_index {

    my ($index) = @_;

    while ($index < @typevalue) {

	my $tv = $typevalue[$index];

	if (!($tv =~ m/^(\C):\s*(.*)/)) {

	    last;

	}

	$index++;

    }

    return $index;

}

sub get_maintainer_role {

    my ($index) = @_;

    my $i;

    my $start = find_starting_index($index);

    my $end = find_ending_index($index);

    my $role = "unknown";

    my $subsystem = $typevalue[$start];

    if (length($subsystem) > 20) {

	$subsystem = substr($subsystem, 0, 17);

	$subsystem =~ s/\s*$//;

	$subsystem = $subsystem . "...";

    }

    for ($i = $start + 1; $i < $end; $i++) {

	my $tv = $typevalue[$i];

	if ($tv =~ m/^(\C):\s*(.*)/) {

	    my $ptype = $1;

	    my $pvalue = $2;

	    if ($ptype eq "S") {

		$role = $pvalue;

	    }

	}

    }

    $role = lc($role);

    if      ($role eq "supported") {

	$role = "supporter";

    } elsif ($role eq "maintained") {

	$role = "maintainer";

    } elsif ($role eq "odd fixes") {

	$role = "odd fixer";

    } elsif ($role eq "orphan") {

	$role = "orphan minder";

    } elsif ($role eq "obsolete") {

	$role = "obsolete minder";

    } elsif ($role eq "buried alive in reporters") {

	$role = "chief penguin";

    }

    return $role . ":" . $subsystem;

}

sub get_list_role {

    my ($index) = @_;

    my $i;

    my $start = find_starting_index($index);

    my $end = find_ending_index($index);

    my $subsystem = $typevalue[$start];

    if (length($subsystem) > 20) {

	$subsystem = substr($subsystem, 0, 17);

	$subsystem =~ s/\s*$//;

	$subsystem = $subsystem . "...";

    }

    if ($subsystem eq "THE REST") {

	$subsystem = "";

    }

    return $subsystem;

}

sub add_categories {

    my ($index) = @_;

    my $i;

    my $start = find_starting_index($index);

    my $end = find_ending_index($index);

    push(@subsystem, $typevalue[$start]);