#!/usr/bin/env perl
use 5.010001;
use warnings;
use strict;
use utf8;

our $VERSION = 'v2.3.6';

use FindBin;
use lib "$FindBin::Bin/../lib/perl5";
use Narada;
use Narada::Config qw( get_config set_config );
use Path::Tiny;


main(@ARGV) if !caller;


sub err { die "narada-setup-cron: @_\n" }

sub main {
    die "Usage: narada-setup-cron [--clean]\n"
        if (@_ >  1)
        || (@_ == 1 && $_[0] ne '--clean');

    if (@_) {
        path('var/use/cron')->remove;
        del_cron();
    }
    else {
        if (Narada::detect() eq 'narada') {
            path('var/use/cron')->touch;
        }
        my $c = path('config/crontab');
        my @configs = map {m{\Aconfig/(.*)}ms} grep {$_->is_file}
                 $c->is_dir ? $c->children : $c;
        if (!@configs) {
            del_cron();
        }
        else {
            my $crontab = join "\n", map { get_config($_) } @configs;
            $crontab = process($crontab);
            set_cron($crontab);
        }
    }

    return;
}

sub get_project_dir {
    chomp (my $project_dir = `pwd`);
    $project_dir !~ /\n/xms or err 'Project directory must not contain \\n';
    return $project_dir;
}

sub process {
    my ($crontab) = @_;
    my $project_dir = get_project_dir();
    $project_dir = quotemeta $project_dir;
    $project_dir =~ s{\\([/,._-])}{$1}xmsg; # unquote safe chars for readability
    $crontab =~ s/^(\s*(?!\#)(?:\S+\s+){5})/${1}cd $project_dir || exit; /xmsg;
    return $crontab;
}

sub get_markers {
    my $project_dir = get_project_dir();
    my $start   = "# ENTER Narada: $project_dir";
    my $end     = "# LEAVE Narada: $project_dir";
    my $re      = qr/^\Q$start\E\n.*?^\Q$end\E(?:\n|\z)/xms;
    return ($re, $start, $end);
}

sub get_user_crontab {
    local $/ = undef;
    # WORKAROUND    If user has no crontab then `crontab -l` output string
    #               "no crontab for USERNAME". So we've to use `crontab -e`
    #               instead, to get empty output in this case.
    open my $cron, q{-|}, 'VISUAL=cat EDITOR=cat crontab -e'   or err "crontab -e: $!";
    my $crontab = <$cron>;
    close $cron                                     or err "crontab -e: $!";
    return $crontab;
}

sub set_user_crontab {
    my ($crontab) = @_;
    open my $cron, q{|-}, 'crontab -'               or err "crontab -e: $!";
    print {$cron} $crontab;
    close $cron                                     or err "crontab -e: $!";
    return;
}

sub force_last_cr {
    my ($s) = @_;
    if ($s =~ /[^\n]\z/xms) {
        $s .= "\n";
    }
    return $s;
}

sub set_cron {
    my ($crontab) = @_;
    $crontab = force_last_cr($crontab);

    my $user_crontab = get_user_crontab();
    my ($re, $start, $end) = get_markers();
    if ($user_crontab !~ /$re/xms) {
        $user_crontab = force_last_cr($user_crontab);
        $user_crontab .= "$start\n$end\n";
    }

    $user_crontab =~ s/$re/$start\n$crontab$end\n/xms;
    set_user_crontab($user_crontab);
    return;
}

sub del_cron {
    my $user_crontab = get_user_crontab();
    my ($re) = get_markers();
    $user_crontab =~ s/$re//xms;
    set_user_crontab($user_crontab);
    return;
}


1; # Magic true value required at end of module
__END__

=encoding utf8

=head1 NAME

narada-setup-cron - synchronize project crontab with user crontab


=head1 VERSION

This document describes narada-setup-cron version v2.3.6


=head1 USAGE

    narada-setup-cron [--clean]


=head1 DESCRIPTION

Should be executed in project deploy directory (or Narada 1.x project root
directory).

Install/remove your Narada project's cron configuration.

When executed without params add/update project's cron configuration found
in "config/crontab" into user's crontab.

When executed with --clean option or in case "config/crontab" doesn't exists
will remove project's cron configuration from user's crontab.


=head1 SYNTAX OF "config/crontab"

Syntax of "config/crontab" is same as for system crontab, but commands in
project's cron configuration will be executed in project's root directory
instead of user's home directory. For this, the "cd /path/to/project ||
exit;" command will be added on-the-fly before user command, i.e. every
line in "config/crontab" like:

    * * * * *    do something

will turn into line in user's crontab like:

    * * * * *    cd /path/to/project || exit; do something


=head1 DIAGNOSTICS

=over

=item C<< project directory must not contain \n >>

Project root directory used in BEGIN/END markers in crontab, which has
line-based format and so directory name must not contain \n.

Also project root directory used in "cd" command in crontab, which suffer
from same limitation.

=item C<< crontab -e: %s  >>

Internal error, possible reason - user doesn't have access to system crontab.

=back


=head1 CONFIGURATION AND ENVIRONMENT

        config/crontab/*
        var/use/cron

Narada 1.x project use C<config/crontab> instead of C<config/crontab/*>.


=head1 SUPPORT

=head2 Bugs / Feature Requests

Please report any bugs or feature requests through the issue tracker
at L<https://github.com/powerman/Narada/issues>.
You will be notified automatically of any progress on your issue.

=head2 Source Code

This is open source software. The code repository is available for
public review and contribution under the terms of the license.
Feel free to fork the repository and submit pull requests.

L<https://github.com/powerman/Narada>

    git clone https://github.com/powerman/Narada.git

=head2 Resources

=over

=item * MetaCPAN Search

L<https://metacpan.org/search?q=Narada>

=item * CPAN Ratings

L<http://cpanratings.perl.org/dist/Narada>

=item * AnnoCPAN: Annotated CPAN documentation

L<http://annocpan.org/dist/Narada>

=item * CPAN Testers Matrix

L<http://matrix.cpantesters.org/?dist=Narada>

=item * CPANTS: A CPAN Testing Service (Kwalitee)

L<http://cpants.cpanauthors.org/dist/Narada>

=back


=head1 AUTHOR

Alex Efros E<lt>powerman@cpan.orgE<gt>

Nick Levchenko E<lt>nick-lev@ya.ruE<gt>


=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2008- by Alex Efros E<lt>powerman@cpan.orgE<gt>.

This is free software, licensed under:

  The MIT (X11) License


=cut