source: vendor/perl/5.8.8/Porting/Maintainers.pm

#
# Maintainers.pm - show information about maintainers
#

package Maintainers;

use strict;

use lib "Porting";

require "Maintainers.pl";
use vars qw(%Modules %Maintainers);

use vars qw(@ISA @EXPORT_OK);
@ISA = qw(Exporter);
@EXPORT_OK = qw(%Modules %Maintainers
                get_module_files get_module_pat
                show_results process_options);
require Exporter;

use File::Find;
use Getopt::Long;

my %MANIFEST;
if (open(MANIFEST, "MANIFEST")) {
    while (<MANIFEST>) {
        if (/^(\S+)\t+(.+)$/) {
            $MANIFEST{$1}++;
        }
    }
    close MANIFEST;
} else {
    die "$0: Failed to open MANIFEST for reading: $!\n";
}

sub get_module_pat {
    my $m = shift;
    split ' ', $Modules{$m}{FILES};
}

sub get_module_files {
    my $m = shift;
    sort { lc $a cmp lc $b }
    map {
        -f $_ ? # Files as-is.
            $_ :
            -d _ ? # Recurse into directories.
            do {
                my @files;
                find(
                     sub {
                         push @files, $File::Find::name
                             if -f $_ && exists $MANIFEST{$File::Find::name};
                     }, $_);
                @files;
            }
        : glob($_) # The rest are globbable patterns.
        } get_module_pat($m);
}

sub get_maintainer_modules {
    my $m = shift;
    sort { lc $a cmp lc $b }
    grep { $Modules{$_}{MAINTAINER} eq $m }
    keys %Modules;
}

sub usage {
    print <<__EOF__;
$0: Usage: $0 [[--maintainer M --module M --files --check]|file ...]
--maintainer M  list all maintainers matching M
--module M      list all modules matching M
--files         list all files
--check         check consistency of Maintainers.pl
--opened        list all modules of files opened by perforce
Matching is case-ignoring regexp, author matching is both by
the short id and by the full name and email.  A "module" may
not be just a module, it may be a file or files or a subdirectory.
The options may be abbreviated to their unique prefixes
__EOF__
    exit(0);
}

my $Maintainer;
my $Module;
my $Files;
my $Check;
my $Opened;

sub process_options {
    usage()
        unless
            GetOptions(
                       'maintainer=s'   => \$Maintainer,
                       'module=s'       => \$Module,
                       'files'          => \$Files,
                       'check'          => \$Check,
                       'opened'         => \$Opened,
                      );

    my @Files;
   
    if ($Opened) {
        my @raw = `p4 opened`;
        die if $?;
        @Files =  map {s!#.*!!s; s!^//depot/.*?/perl/!!; $_} @raw;
    } else {
        @Files = @ARGV;
    }

    usage() if @Files && ($Maintainer || $Module || $Files);

    for my $mean ($Maintainer, $Module) {
        warn "$0: Did you mean '$0 $mean'?\n"
            if $mean && -e $mean && $mean ne '.' && !$Files;
    }

    warn "$0: Did you mean '$0 -mo $Maintainer'?\n"
        if defined $Maintainer && exists $Modules{$Maintainer};

    warn "$0: Did you mean '$0 -ma $Module'?\n"
        if defined $Module     && exists $Maintainers{$Module};

    return ($Maintainer, $Module, $Files, @Files);
}

sub show_results {
    my ($Maintainer, $Module, $Files, @Files) = @_;

    if ($Maintainer) {
        for my $m (sort keys %Maintainers) {
            if ($m =~ /$Maintainer/io || $Maintainers{$m} =~ /$Maintainer/io) {
                my @modules = get_maintainer_modules($m);
                if ($Module) {
                    @modules = grep { /$Module/io } @modules;
                }
                if ($Files) {
                    my @files;
                    for my $module (@modules) {
                        push @files, get_module_files($module);
                    }
                    printf "%-15s @files\n", $m;
                } else {
                    if ($Module) {
                        printf "%-15s @modules\n", $m;
                    } else {
                        printf "%-15s $Maintainers{$m}\n", $m;
                    }
                }
            }
        }
    } elsif ($Module) {
        for my $m (sort { lc $a cmp lc $b } keys %Modules) {
            if ($m =~ /$Module/io) {
                if ($Files) {
                    my @files = get_module_files($m);
                    printf "%-15s @files\n", $m;
                } else {
                    printf "%-15s $Modules{$m}{MAINTAINER}\n", $m;
                }
            }
        }
    } elsif (@Files) {
        my %ModuleByFile;

        for (@Files) { s:^\./:: }

        @ModuleByFile{@Files} = ();

        # First try fast match.

        my %ModuleByPat;
        for my $module (keys %Modules) {
            for my $pat (get_module_pat($module)) {
                $ModuleByPat{$pat} = $module;
            }
        }
        # Expand any globs.
        my %ExpModuleByPat;
        for my $pat (keys %ModuleByPat) {
            if (-e $pat) {
                $ExpModuleByPat{$pat} = $ModuleByPat{$pat};
            } else {
                for my $exp (glob($pat)) {
                    $ExpModuleByPat{$exp} = $ModuleByPat{$pat};
                }
            }
        }
        %ModuleByPat = %ExpModuleByPat;
        for my $file (@Files) {
            $ModuleByFile{$file} = $ModuleByPat{$file}
                if exists $ModuleByPat{$file};
        }

        # If still unresolved files...
        if (my @ToDo = grep { !defined $ModuleByFile{$_} } keys %ModuleByFile) {

            # Cannot match what isn't there.
            @ToDo = grep { -e $_ } @ToDo;

            if (@ToDo) {
                # Try prefix matching.

                # Remove trailing slashes.
                for (@ToDo) { s|/$|| }

                my %ToDo;
                @ToDo{@ToDo} = ();

                for my $pat (keys %ModuleByPat) {
                    last unless keys %ToDo;
                    if (-d $pat) {
                        my @Done;
                        for my $file (keys %ToDo) {
                            if ($file =~ m|^$pat|i) {
                                $ModuleByFile{$file} = $ModuleByPat{$pat};
                                push @Done, $file;
                            }
                        }
                        delete @ToDo{@Done};
                    }
                }
            }
        }

        for my $file (@Files) {
            if (defined $ModuleByFile{$file}) {
                my $module     = $ModuleByFile{$file};
                my $maintainer = $Modules{$ModuleByFile{$file}}{MAINTAINER};
                printf "%-15s $module $maintainer $Maintainers{$maintainer}\n", $file;
            } else {
                printf "%-15s ?\n", $file;
            }
        }
    }
    elsif ($Check) {
        duplicated_maintainers();
    }
    else {
        usage();
    }
}

sub duplicated_maintainers {
    my %files;
    for my $k (keys %Modules) {
        for my $f (get_module_files($k)) {
            ++$files{$f};
        }
    }
    for my $f (keys %files) {
        if ($files{$f} > 1) {
            warn "File $f appears $files{$f} times in Maintainers.pl\n";
        }
    }
}

1;