#!/usr/bin/perl -w
# scripts -- maemian collection script

# Copyright (C) 1998 Richard Braakman
# 
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
# 
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
# 
# You should have received a copy of the GNU General Public License
# along with this program.  If not, you can find it on the World Wide
# Web at http://www.gnu.org/copyleft/gpl.html, or write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.

use strict;

open(SCRIPTS, '>', "scripts") or fail("cannot open scripts output file: $!");
open(INDEX, '<', "index") or fail("cannot open index file: $!");

my $file;
my $magic;
my $scriptpath;

while (<INDEX>) {
    next unless /^-/;   # skip non-files
    chop;

    # Extract the filename field from the tar-like file index.
    # Note that the split is done with an explicit limit so that filenames
    # with embedded spaces are handled correctly.
    $file = (split(' ', $_, 6))[5];
    $file =~ s/ link to .*//;    # cut off info about hard links
    # This used to call fail() instead of next.  However, the check to
    # see if all files in the index can be opened should be done elsewhere.
    open(FILE, '<', "unpacked/$file") or next;
    if (read(FILE, $magic, 2) and $magic eq '#!' and not eof(FILE)) {
	$scriptpath = <FILE>;
	chomp($scriptpath);
	next if ($scriptpath =~ m/^\#!/); # skip lincity data files
	                                  # #!#!#!
	my $copy_path = $scriptpath;
	$scriptpath =~ s/^\s+//; # remove leading whitespace
	$scriptpath =~ s/^\#.*//; # remove comments
	if ($scriptpath eq '') {
	    print SCRIPTS "$copy_path $file\n";
	} else {
	# This used to have (\S+) rather than (\S*), but that went wrong
	# with scripts that start with an empty #! line.
	    my $env = '';
	    if ($scriptpath =~ s,^/usr/bin/env\s+,,) {
	        $env = 'env ';
	    }
            $scriptpath =~ s/^(\S*).*/$1/s;
	    print SCRIPTS $env . "$scriptpath $file\n";
	}
    }
    close(FILE);
}
close(INDEX);
close(SCRIPTS);

open(SCRIPTS, '>', "control-scripts")
    or fail("cannot open control-scripts output file: $!");

opendir(CONTROL, "control")
    or fail("cannot read control directory: $!");

for $file (readdir CONTROL) {
    next unless -f "control/$file";
    open(FILE, '<', "control/$file") or fail("cannot open control/$file: $!");
    if (read(FILE, $magic, 2) and $magic eq '#!') {
	$scriptpath = <FILE>;
	$scriptpath =~ s/^\s*(\S*).*/$1/s;
	print SCRIPTS "$scriptpath $file\n"
    }
    close(FILE);
}
closedir(CONTROL);
close(SCRIPTS);

exit 0;

# -----------------------------------

sub fail {
    if ($_[0]) {
        print STDERR "internal error: $_[0]\n";
    } elsif ($!) {
        print STDERR "internal error: $!\n";
    } else {
        print STDERR "internal error.\n";
    }
    exit 1;
}