Solution to task 1

1 files changed, 92 insertions, 0 deletions

diff --git a/challenge-347/jo-37/perl/ch-1.pl b/challenge-347/jo-37/perl/ch-1.pl
new file mode 100755
index 0000000000..d1e46a64b6
--- /dev/null
+++ b/challenge-347/jo-37/perl/ch-1.pl
@@ -0,0 +1,92 @@
+#!/usr/bin/perl
+
+use v5.26;
+use Test2::V0 -no_srand;
+use Test2::Tools::Subtest 'subtest_streamed';
+use Getopt::Long;
+use experimental 'signatures';
+
+use DateTime::Format::Strptime;
+use DateTime::Format::DateParse;
+
+### Options and Arguments
+
+my ($tests, $examples, $verbose);
+GetOptions(
+    'examples!' => \$examples,
+    'tests!'    => \$tests,
+    'verbose!'  => \$verbose,
+) or usage();
+
+run_tests($examples, $tests);	# tests do not return
+
+usage() unless @ARGV;
+
+sub usage {
+    die <<~EOS;
+    $0 - format date
+
+    usage: $0 [-examples] [-tests] [DATE]
+
+    -examples
+        run the examples from the challenge
+     
+    -tests
+        run some tests
+
+    DATE
+        a date parseable by Date::Parse
+
+    EOS
+}
+
+
+### Input and Output
+
+say format_date("@ARGV");
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2025/11/14/ch-347.html#task-1
+
+sub format_date {
+    state $fmt = DateTime::Format::Strptime->new(pattern => '%F');
+    DateTime::Format::DateParse->parse_datetime(shift)->set_formatter($fmt);
+}
+
+
+### Examples and Tests
+
+sub run_tests ($examples, $tests) {
+    return unless $examples || $tests;
+
+    state sub run_example ($args, $expected, $name, $reason=undef) {
+        my $todo = $reason ? todo $reason : undef;
+        my $result = format_date(@$args);
+        is $result, $expected,
+            "$name: (@$args) -> " . $expected->name;
+    }
+
+    plan 2;
+
+    $examples ? subtest_streamed(examples => sub {
+        my @examples = (
+            [["1st Jan 2025"],  string("2025-01-01"), 'example 1'],
+            [["22nd Feb 2025"], string("2025-02-22"), 'example 2'],
+            [["15th Apr 2025"], string("2025-04-15"), 'example 3'],
+            [["23rd Oct 2025"], string("2025-10-23"), 'example 4'],
+            [["31st Dec 2025"], string("2025-12-31"), 'example 5'],
+        );
+        plan scalar @examples;
+        run_example @$_ for @examples;
+    }) : pass 'skip examples';
+
+    $tests ? subtest_streamed(tests => sub {
+        plan 1;
+        like dies {format_date("29th Feb 2025")}, qr/invalid/i, 'invalid date';
+    }) : pass 'skip tests';
+
+    exit;
+}