From 4c88c47a4bac711f57c2fd7f8f7a2302a334b9c2 Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Tue, 29 Jun 2021 12:59:57 +0200
Subject: simplify event sorting using the Schwartzian Transform

---
 bin/events2md.pl | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/bin/events2md.pl b/bin/events2md.pl
index 84880af..847b7b9 100755
--- a/bin/events2md.pl
+++ b/bin/events2md.pl
@@ -22,7 +22,7 @@ use Cal::DAV;
 use Data::ICal;
 use iCal::Parser;
 use List::Util qw(first);
-use List::MoreUtils qw(nsort_by sort_by);
+use List::MoreUtils qw(nsort_by qsort);
 use DateTime;
 use Try::Tiny;
 use Path::Tiny;
@@ -161,21 +161,20 @@ for my $year ( map { $_->value }
 {
 	for my $month ( map { $_->value } nsort_by { $_->key } pairs %$year ) {
 		for my $day ( map { $_->value } nsort_by { $_->key } pairs %$month ) {
-			for (
-				sort_by {
-					$_->value->{DTSTART}
-						. $_->value->{DTEND}
-						. ( $_->value->{SUMMARY} || '' )
-				}
-				pairs %$day
-				)
-			{
-				print_event(
-					$calendar_entries{VEVENT}{ $_->key },
-					$_->value->{DTSTART},
-					$_->value->{DTEND},
-					$output_path,
-				);
+			my @events = map {
+				[   $calendar_entries{VEVENT}{$_},
+					$day->{$_}{DTSTART}, $day->{$_}{DTEND}
+				]
+			} keys %$day;
+			qsort {
+				DateTime->compare( $a->[1], $b->[1] )
+					|| DateTime->compare( $a->[2], $b->[2] )
+					|| get_property_string( $a->[0], 'summary' )
+					cmp get_property_string( $b->[0], 'summary' )
+			}
+			@events;
+			for (@events) {
+				print_event( $_->[0], $_->[1], $_->[2], $output_path, );
 			}
 		}
 	}
-- 
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