From 394df58d6da6928a6a3ebae31362342deca74b48 Mon Sep 17 00:00:00 2001
From: Thomas Voss <thomasvoss@live.com>
Date: Wed, 1 Dec 2021 08:56:00 +0100
Subject: Add a shell script solution

---
 2021/01/Makefile   | 10 ++++++----
 2021/01/README     |  3 +++
 2021/01/puzzles.sh |  3 +++
 3 files changed, 12 insertions(+), 4 deletions(-)
 create mode 100644 2021/01/README
 create mode 100644 2021/01/puzzles.sh

(limited to '2021/01')

diff --git a/2021/01/Makefile b/2021/01/Makefile
index 9f0c9fb..d6b3c62 100644
--- a/2021/01/Makefile
+++ b/2021/01/Makefile
@@ -1,8 +1,10 @@
 all:
-	sed '/# START PART 2/,/# END PART 2/d' puzzles.py >puzzle-1.py
-	sed '/# START PART 1/,/# END PART 1/d' puzzles.py >puzzle-2.py
-	chmod +x puzzle-[12].py
+	for ext in py sh; do \
+		m4 -D DELTA=1 puzzles.$$ext >puzzle-1.$$ext; \
+		m4 -D DELTA=3 puzzles.$$ext >puzzle-2.$$ext; \
+	done
+	chmod +x puzzle-[12].{py,sh}
 
 .PHONY: clean
 clean:
-	rm -f puzzle-[12].py
+	rm -f puzzle-[12].{py,sh}
diff --git a/2021/01/README b/2021/01/README
new file mode 100644
index 0000000..8f9110a
--- /dev/null
+++ b/2021/01/README
@@ -0,0 +1,3 @@
+Originally written in Python because it's an easy language and I was speedcoding this at 6:00. In
+hindsight this is a good shell script problem, so I wrote it again in that (it would have been my
+goto language if I didn't have a python setup waiting for the clock to hit 6:00).
diff --git a/2021/01/puzzles.sh b/2021/01/puzzles.sh
new file mode 100644
index 0000000..9cf8043
--- /dev/null
+++ b/2021/01/puzzles.sh
@@ -0,0 +1,3 @@
+#!/usr/bin/env sh
+
+paste -s input | awk '{ for (i = 1; i < NF; i++) c += $i < $(i + DELTA) } END { print c }'
-- 
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