#!./perl
BEGIN { @INC = ('lib') }
use Config;
use Getopt::Long;
use File::Find;
require Cwd;

umask 022;

$ver = $];
$release = substr($ver,0,3);   # Not used presently.
$patchlevel = substr($ver,3,2);
die "Patchlevel of perl ($patchlevel)",
    "and patchlevel of config.sh ($Config{'PATCHLEVEL'}) don't match\n"
	if $patchlevel != $Config{'PATCHLEVEL'};

$usage =
"Usage:  installman --man1dir=/usr/wherever --man1ext=1
                    --man3dir=/usr/wherever --man3ext=3
		    --notify --help
	Defaults are:
	man1dir = $Config{'installman1dir'};
	man1ext = $Config{'man1ext'};
	man3dir = $Config{'installman3dir'};
	man3ext = $Config{'man3ext'};
	--notify (or -n) just lists commands that would be executed.\n";

GetOptions( qw( man1dir=s man1ext=s man3dir=s man3ext=s notify help)) 
	|| die $usage;

# These are written funny to avoid -w typo warnings.
$man1dir = defined($opt_man1dir) ? $opt_man1dir : $Config{'installman1dir'};
$man1ext = defined($opt_man1ext) ? $opt_man1ext : $Config{'man1ext'};
$man3dir = defined($opt_man3dir) ? $opt_man3dir : $Config{'installman3dir'};
$man3ext = defined($opt_man3ext) ? $opt_man3ext : $Config{'man3ext'};

$notify = defined($opt_notify) ? $opt_notify : 0;

#Sanity checks

-x  "./perl"	|| warn "./perl not found!  Have you run make?\n";
-d  $Config{'installprivlib'}
	|| warn "Perl library directory $Config{'installprivlib'} not found.
		Have you run make install?.  (Installing anyway.)\n";
-x 't/TEST'		|| warn "WARNING: You've never run 'make test'!!!",
	"  (Installing anyway.)\n";

# Install the main pod pages.
runpod2man('pod', $man1dir, $man1ext);

# Install the pods for library modules.
runpod2man('lib', $man3dir, $man3ext);

sub runpod2man {
    my($poddir, $mandir, $manext) = @_;
    my($builddir) = Cwd::getcwd();

    if ($mandir eq ' ' or $mandir eq '') {
	print STDERR "Skipping installation of $poddir man pages.\n";
	return;
    }

    chdir $poddir || die "Unable to cd to $poddir directory!\n$!\n";

    # We insist on using the current version of pod2man in case there
    # are enhancements or changes from previous installed versions.
    # The error message doesn't include the '..' because the user
    # won't be aware that we've chdir to $poddir.
    -x  "../pod/pod2man" || die "Executable pod/pod2man not found.\n";

    # We want to be sure to use the current perl.  We can't rely on
    # the installed perl because it might not be actually installed
    # yet. (The user may have set the $install* Configure variables 
    # to point to some temporary home, from which the executable gets
    # installed by occult means.)
    $pod2man = "../perl -I ../lib ../pod/pod2man";

    &makedir($mandir);
    # Make a list of all the .pm and .pod files in the directory.  We will
    # always run pod2man from the lib directory and feed it the full pathname
    # of the pod.  This might be useful for pod2man someday.
    @modpods = ();
    find(\&lsmodpods, '.');
    foreach $mod (@modpods) {
	$manpage = $mod;
	# Convert name from  File/Basename.pm to File::Basename.3 format,
	# if necessary.
	$manpage =~ s#\.p(m|od)$##;
	$manpage =~ s#/#::#g;
	$manpage = "${mandir}/${manpage}.${manext}";
	# Print $release $patchlevel stuff?  or should pod2man do that?
	&cmd("$pod2man $mod > $manpage");
    }
    chdir "$builddir" || die "Unable to cd back to $builddir directory!\n$!\n";
}

sub lsmodpods {
    my $dir  = $File::Find::dir;
    my $name = $File::Find::name;
    if (-f $_) {
        $name =~ s#^\./##;
	push(@modpods, $name) if ($name =~ /\.p(m|od)$/);
    }
}

print STDERR "  Installation complete\n";

exit 0;
    

###############################################################################
# Utility subroutines from installperl

sub cmd {
    local($cmd) = @_;
    print STDERR "  $cmd\n";
    unless ($notify) {
	system $cmd;
	warn "Command failed!!!\n" if $?;
    }
}

sub link {
    local($from,$to) = @_;

    print STDERR "  ln $from $to\n";
    link($from,$to) || warn "Couldn't link $from to $to: $!\n" unless $notify;
}

sub chmod {
    local($mode,$name) = @_;

    printf STDERR "  chmod %o %s\n", $mode, $name;
    chmod($mode,$name) || warn sprintf("Couldn't chmod %o %s: $!\n",$mode,$name)
	unless $notify;
}

sub makedir {
    local($dir) = @_;
    unless (-d $dir) {
	local($shortdir) = $dir;

	$shortdir =~ s#(.*)/.*#$1#;
	&makedir($shortdir);

	print STDERR "  mkdir $dir\n";
	mkdir($dir, 0777) || warn "Couldn't create $dir: $!\n" unless $notify;
    }
}

sub samepath {
    local($p1, $p2) = @_;
    local($dev1, $ino1, $dev2, $ino2);

    if ($p1 ne $p2) {
	($dev1, $ino1) = stat($p1);
	($dev2, $ino2) = stat($p2);
	($dev1 == $dev2 && $ino1 == $ino2);
    }
    else {
	1;
    }
}