From 5ab72f71a1b4686f5acf6ae5562f2829b0ee9c6e Mon Sep 17 00:00:00 2001
From: Abigail <abigail@abigail.be>
Date: Fri, 19 Feb 2021 01:47:09 +0100
Subject: Ruby solution for week 100, part 1

---
 challenge-100/abigail/README.md    |  1 +
 challenge-100/abigail/ruby/ch-1.rb | 43 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 challenge-100/abigail/ruby/ch-1.rb

diff --git a/challenge-100/abigail/README.md b/challenge-100/abigail/README.md
index 7afd7bb3f2..e87dfae955 100644
--- a/challenge-100/abigail/README.md
+++ b/challenge-100/abigail/README.md
@@ -26,6 +26,7 @@ Output: 07:15 pm or 07:15pm
 * [Node.js](node/ch-1.js)
 * [Perl](perl/ch-1.pl)
 * [Python](python/ch-1.py)
+* [Ruby](ruby/ch-1.rb)
 
 ### Blog
 
diff --git a/challenge-100/abigail/ruby/ch-1.rb b/challenge-100/abigail/ruby/ch-1.rb
new file mode 100644
index 0000000000..012c2e700f
--- /dev/null
+++ b/challenge-100/abigail/ruby/ch-1.rb
@@ -0,0 +1,43 @@
+#!/usr/bin/ruby
+
+#
+# See ../README.md
+#
+ 
+#
+# Run as: ruby ch-1.rb < input-file
+#
+
+ARGF . each_line do |_|
+    #
+    # Parse data. Note that we have to map the hours and
+    # minutes from strings to integers.
+    #
+    m = _ . match /(?<hour>[0-9]+):(?<minute>[0-9]+)\s*(?<ampm>[ap]?)/
+    hour   = m [:hour]   . to_i
+    minute = m [:minute] . to_i
+    ampm   = m [:ampm]
+
+    #
+    # Calculate the new AM/PM marker
+    #
+    new_ampm = ampm == "" ? hour >= 12 ? "pm" : "am" : ""
+
+    #
+    # Calculate the new hour
+    #
+    hour %= 12
+
+    if   ampm == "" && hour == 0
+    then hour =  12
+    end
+
+    if   ampm == "p"
+    then hour += 12
+    end
+
+    #
+    # Print the result
+    #
+    puts sprintf("%02d:%02d%s", hour, minute, new_ampm)
+end
-- 
cgit