—

              
#!perl
## no critic (InputOutput::RequireBriefOpen)
use 5.010;
use strict;
use warnings;
#use Log::Any '$log';
our $AUTHORITY = 'cpan:PERLANCAR'; # AUTHORITY
our $DATE = '2023-02-18'; # DATE
our $DIST = 'App-datecalc'; # DIST
our $VERSION = '0.090'; # VERSION
sub get_options {
    require Getopt::Long;
    my %opts;
    Getopt::Long::GetOptions(
        '--help|h|?', \$opts{help},
        '--version|v', \$opts{version},
    );
    if ($opts{help}) {
        print <<_;
Usage:
  datecalc [OPTIONS]
Options:
  --help, -h, -?
  --version, -v
_
        exit 0;
    } elsif ($opts{version}) {
        say "datecalc version $::VERSION";
        exit 0;
    }
}
sub eval_loop {
    require App::datecalc;
    require File::HomeDir;
    require IO::Stty;
    require Term::ReadLine;
    my $calc = App::datecalc->new;
    my $term = Term::ReadLine->new('datecalc');
    my $prompt = "> ";
    my $OUT = $term->OUT || \*STDOUT;
    my $histfile = File::HomeDir->my_home . "/.datecalc_history";
    # load history from file
    if ($term->Features->{setHistory} && (-r $histfile)) {
        #$log->tracef("Loading history from %s ...", $histfile);
        open(my $fh, '<', $histfile)
            or die "Can't open history file $histfile: $!\n";
        chomp(my @history = <$fh>);
        $term->SetHistory(@history);
    }
    my $sub_save_hist = sub {
        require List::Util::Uniq;
        if ($term->Features->{getHistory}) {
            my $fh;
            if (open $fh, ">", $histfile) {
                print $fh "$_\n" for
                    List::Util::Uniq::uniq_adj(
                        grep { length } $term->GetHistory
                    );
            }
        }
    };
    local $SIG{INT} = sub {
        # save history when we are interrupted
        $sub_save_hist->();
        print STDERR "Interrupted\n";
        if ($term->ReadLine eq 'Term::ReadLine::Gnu') {
            IO::Stty::stty(\*STDIN, 'echo');
        }
        exit 1;
    };
    #local $SIG{__DIE__} = sub {
    #    IO::Stty::stty(\*STDIN, 'echo');
    #    die @_;
    #};
    # some workaround for Term::ReadLine
    my $attribs = $term->Attribs;
    if ($term->ReadLine eq 'Term::ReadLine::Gnu') {
        # TR::Gnu traps our INT handler
        # ref: http://www.perlmonks.org/?node_id=1003497
        $attribs->{catch_signals} = 0;
    } elsif ($term->ReadLine eq 'Term::ReadLine::Perl') {
        # TR::Perl messes up colors
        # doesn't do anything?
        #$term->ornaments(0);
        #$attribs->{term_set} = ["", "", "", ""];
    }
    while ( defined ($_ = $term->readline($prompt)) ) {
        my $res;
        if ($_ eq 'help' || $_ eq '?') {
            say "Type date expression into the prompt, e.g.: 2014-06-26 + 2 week.";
            say "For more details on available features, 'man datecalc'.";
            say "";
            next;
        } elsif ($_ eq 'exit' || $_ eq 'quit') {
            last;
        }
        eval { $res = $calc->eval($_) };
        if ($@) {
            warn "Error: $@\n";
        } else {
            print $OUT $res, "\n";
        }
        # double?
        #$term->addhistory($_) if /\S/;
    }
    $sub_save_hist->();
}
### main
get_options();
eval_loop();
# ABSTRACT: Date calculator
# PODNAME: datecalc
__END__
HideShow 135 lines of Pod
=pod
=encoding UTF-8
=head1 NAME
datecalc - Date calculator
=head1 VERSION
This document describes version 0.090 of datecalc (from Perl distribution App-datecalc), released on 2023-02-18.
=head1 SYNOPSIS
 % datecalc
 > today
 2014-05-13#Tue
 > tomorrow
 2014-05-14#Wed
 > today + 2 days
 2014-05-15#Thu
 > 2014-05-13 - 2014-02-14
 P2M3W6D
 > days(2014-05-13 - 2014-02-14)
 4
 > totdays(2014-05-13 - 2014-02-14)
 88
 > 2 months 3 weeks 6 days
 P2M3W6D
 > P10D
 P1W3D
 > 2014-05-13 + P2D
 2014-05-15#Thu
 > 2 * 2 days 10 hours
 P4DT20H
 > P10D / 2
 P5D
 > 6d + 8d + 13 min
 P2WT13M
 > month(today)
 5
 > days(P8D)
 1
 > weeks(P8D)
 1
 > P8D
 P1W1D
=head1 DESCRIPTION
This is a command-line utility to perform date calculations.
For now, for more details, see L<App::datecalc>.
=head1 FAQ
=head2 Why is date addition/subtraction with fractional duration incorrect?
For example:
 > 2001-01-01 + P1.5M
 2001-02-01#Thu
One would expect something closer to C<2001-02-16>. But this is how
L<DateTime::Duration> works. Instead of using fractions in larger units, try
using smaller units instead. For example:
 > 2001-01-01 + P1M2W
 2001-02-15#Thu
=head1 FILES
=head2 ~/.datecalc_history
=head1 HOMEPAGE
Please visit the project's homepage at L<https://metacpan.org/release/App-datecalc>.
=head1 SOURCE
Source repository is at L<https://github.com/perlancar/perl-App-datecalc>.
=head1 AUTHOR
perlancar <perlancar@cpan.org>
=head1 CONTRIBUTING
To contribute, you can send patches by email/via RT, or send pull requests on
GitHub.
Most of the time, you don't need to build the distribution yourself. You can
simply modify the code, then test via:
 % prove -l
If you want to build the distribution (e.g. to try to install it locally on your
system), you can install L<Dist::Zilla>,
L<Dist::Zilla::PluginBundle::Author::PERLANCAR>,
L<Pod::Weaver::PluginBundle::Author::PERLANCAR>, and sometimes one or two other
Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps required beyond
that are considered a bug and can be reported to me.
=head1 COPYRIGHT AND LICENSE
This software is copyright (c) 2023, 2018, 2016, 2015, 2014 by perlancar <perlancar@cpan.org>.
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
=head1 BUGS
Please report any bugs or feature requests on the bugtracker website L<https://rt.cpan.org/Public/Dist/Display.html?Name=App-datecalc>
When submitting a bug or request, please include a test-file or a
patch to an existing test-file that illustrates the bug or desired
feature.
=cut