#!/usr/bin/perl -w

use Data::Dumper;
use Getopt::Long;
my %DEPENDENCIES = ();
my %LOCATIONS = ();
my %depotmap = ();
my %MODNAMES = ();
my $files = "";
my @files = ();
my $mapfile = "";
my $module = 'BOGUS';
my $verbose = 0;
my $error_seen = 0;
$|=1;

sub usage {
    my $cmd = $0;
    $cmd =~ s|.*/||;
    print <<_EOF_;
Usage: $cmd [ -f files -m mapfile -v ] cvs-modules

    -h|--help         print this message
    -f|--files files  a set of regexps to define files in the cvs modules
    -m|--map mapfile  use a module to depot mapping instead of a default one
    -v|--verbose      add comments to the output (option can be repeated)
_EOF_
    exit $_[0];
}

Getopt::Long::Configure ("bundling");
GetOptions(
        "h|help"     => sub { usage(0) },
        "f|files=s"  => \$files,
        "m|map=s"    => \$mapfile,
        "v|verbose+" => \$verbose,
) || usage(1);
my $cvsmod = shift || usage(1);

sub verbose {
    my $level = @_ > 1 ? shift : 1;
    print @_, "\n" if $level <= $verbose;
}

sub _add_path {
    local $_ = shift;
    if (exists($MODNAMES{$_})) {
        verbose 2, "#   adding MODULE $_ to $module";
	push @{$DEPENDENCIES{$module}}, $_;
    } else {
        s|/$||;
        my $isfile = 0;
	my $depot = $depotmap{$module} || "//depot/$module";
	if ($mapfile && !$depotmap{$module}) {
	    warn "No mapping for '$module' in '$mapfile'\n";
	    $error_seen = 1;
	}
        for my $re (@files) {
            verbose 3, "#     checking for file match against: $re";
            $isfile = 1, last if /$re/;
        }
        if ($isfile) {
            verbose 2, "#   adding FILE $_ to $module";
	    $LOCATIONS{$module}->{"$depot/\@B@/" . $_ } = "/$_";
        } else {
            verbose 2, "#   adding DIRECTORY $_ to $module";
	    $LOCATIONS{$module}->{"$depot/\@B@/" . $_ . "/..."} = "/$_/...";
        }
    }
}

if ($files) {
  open FILES, "<$files" or die "can't open \"$files\": $!\n";
  @files = <FILES>;
  chomp @files;
  close FILES or die "can't close \"$files\": $!\n";
}
if ($mapfile) {
  open MAP, "<$mapfile" or die "can't open \"$mapfile\": $!\n";
  %depotmap = map { /^#/ ? () : reverse split /\s+/ } <MAP>;
  close MAP or die "can't close \"$mapfile\": $!\n";
}

open CVSMOD, "<$cvsmod" or die "can't open \"$cvsmod\": $!\n";
verbose "# looking for modulenames";
while (<CVSMOD>) {
    chomp;
    next if /^#/;
    next if /^\s*$/;
    s/\\\s*$//;
    if (/^(\S+)/) {
        verbose "#  found module: $1";
        $MODNAMES{$1} = 1;
    }
}
verbose "# filling in module dependencies and locations";
seek(CVSMOD, 0, 0) or die "couldn't go back to the start of \"$cvsmod\": $!\n";
while (<CVSMOD>) {
    chomp;
    next if /^#/;
    next if /^\s*$/;
    s/\\\s*$//;
    verbose 3, "# parsing line: $_";
    # Look for new modules.
    if (/^(\S+)/) {
        verbose "#  found module: $1";
        $module = $1;
        s/^(\S+)//;
    }
    # There may be spurious '-a' options.  Delete them.
    for my $path (m/'.*?'|".*?"|\S+/g) {
        $path =~ s/^['"]|['"]$//g;
        next if $path eq "-a";
        next if $path eq "";
	_add_path($path);
    }
}
close CVSMOD or die "can't close \"$cvsmod\": $!\n";

if ($error_seen) {
    die "An error occurred.  See warning.\n"
}
$Data::Dumper::Indent = 1;
print Dumper \%DEPENDENCIES, \%LOCATIONS;
print "%P4::Modules::DEPENDENCIES = (%\$VAR1);\n";
print "%P4::Modules::LOCATIONS = (%\$VAR2);\n";
print "1;\n";