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#!/usr/bin/env perl
use strict;
use warnings;
use Data::ICal;
use Data::ICal::DateTime;
use Term::ReadKey;
use Text::Wrap;
my $ics = do { local $/; <> };
my $calendar = Data::ICal->new(data => $ics)
|| Data::ICal->new(data => $ics, vcal10 => 1);
if (!$calendar) {
die "Couldn't parse calendar file: " . $calendar->error_message;
}
my $tz_offsets = parse_tz_offsets($calendar);
print_events($calendar, $tz_offsets);
sub get_tz_offset {
my ($dt, $tzid, $tz_offsets) = @_;
my $offsets = $tz_offsets->{$tzid};
my $closest;
for my $offset (@$offsets) {
my $prev = $offset->[0]->previous($dt);
if (!$closest || $closest->[0] < $prev) {
$closest = [ $prev, $offset->[1] ];
}
}
return $closest->[1];
}
sub parse_tz_offsets {
my ($cal) = @_;
my %tz_offsets;
for my $entry (entries_by_type('VTIMEZONE', @{ $cal->entries })) {
my $name = $entry->property('TZID')->[0]->value;
for my $dstentry (@{ $entry->entries }) {
my ($rrule, $dtstart, $dtend) = map {
$dstentry->property($_)
? $dstentry->property($_)->[0]->value
: undef
} ('RRULE', 'DTSTART', 'DTEND');
my $recurrence = DateTime::Format::ICal->parse_recurrence(
recurrence => $rrule,
# XXX this makes the calculations way too slow, and probably
# will never matter
# (defined($dtstart)
# ? (dtstart =>
# DateTime::Format::ICal->parse_datetime($dtstart))
# : ()),
# (defined($dtend)
# ? (dtend =>
# DateTime::Format::ICal->parse_datetime($dtend))
# : ()),
);
push @{ $tz_offsets{$name} ||= [] }, [
$recurrence,
$dstentry->property('TZOFFSETTO')->[0]->value,
];
}
}
return \%tz_offsets;
}
sub print_events {
my ($cal, $tz_offsets) = @_;
my ($width, $height, undef, undef) = GetTerminalSize(*STDOUT);
local $Text::Wrap::columns = $width - 8
if defined $width;
for my $entry (entries_by_type('VEVENT', @{ $cal->entries })) {
my $props = $entry->properties;
delete $props->{$_} for grep { /^x-microsoft/ } keys %$props;
delete $props->{$_} for qw(
sequence status transp dtstamp priority class uid
created last-modified
);
my $organizer = format_person(
(delete $props->{organizer})->[0]
) if $props->{organizer};
my $summary = format_text(
(delete $props->{summary})->[0]->value, 13
) if $props->{summary};
my $start_time = format_time(
(delete $props->{dtstart})->[0], $tz_offsets
) if $props->{dtstart};
my $end_time = format_time(
(delete $props->{dtend})->[0], $tz_offsets
) if $props->{dtend};
# XXX actually handle these
delete $props->{rrule};
delete $props->{exdate};
delete $props->{'recurrence-id'};
my $location = format_text(
(delete $props->{location})->[0]->value, 13
) if $props->{location};
my $attendees = format_text(
join(', ',
map { format_person($_) } @{ delete $props->{attendee} }
),
13
) if $props->{attendee};
my $description = format_text(
(delete $props->{description})->[0]->value, 0
);
warn "unparsed keys: ", join(', ', keys %$props)
if keys %$props;
print "-" x $Text::Wrap::columns, "\n";
printf "%-11s: %s\n", 'Organizer', $organizer if defined $organizer;
printf "%-11s: %s\n", 'Summary', $summary if defined $summary;
printf "%-11s: %s\n", 'Start time', $start_time if defined $start_time;
printf "%-11s: %s\n", 'End time', $end_time if defined $end_time;
printf "%-11s: %s\n", 'Location', $location if defined $location;
printf "%-11s: %s\n", 'Attendees', $attendees if defined $attendees;
print "\n";
print $description;
print "\n";
}
}
sub format_person {
my ($person) = @_;
(my $email = $person->value) =~ s/^mailto://i;
if (my $name = $person->parameters->{CN}) {
return "$name <$email>";
}
else {
return $email;
}
}
sub format_text {
my ($text, $indent) = @_;
my $wrapped;
if (!eval { $wrapped = wrap('', ' ' x $indent, $text); 1 }) {
warn "Couldn't wrap text: $@";
$wrapped = $text;
}
return $wrapped;
}
sub format_time {
my ($time, $tz_offsets) = @_;
my $dt = DateTime::Format::ICal->parse_datetime($time->value);
my $offset;
if (my $tzid = $time->parameters->{TZID}) {
$offset = get_tz_offset($dt, $tzid, $tz_offsets);
die "unknown time zone: $tzid" if !$offset;
}
else {
$offset = 'UTC';
}
$dt->set_time_zone($offset);
$dt->set_time_zone('local');
return "$dt";
}
sub entries_by_type {
my ($type, @entries) = @_;
return grep { $_->ical_entry_type eq $type } @entries;
}
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