Day 3

3.fish

@@ -0,0 +1,19 @@
+#!/bin/env fish
+
+set path "$argv[1]"
+
+grep -Po 'mul\((\d+,\d+)\)' "$path" |
+	awk -F'[,()]' ' \
+		    { sum += $2 * $3 } \
+		END { print "Part one " sum } \
+	'
+
+grep -Po "(mul\((\d+,\d+)\))|(do\(\))|(don't\(\))" "$path" |
+	awk -F'[,()]' ' \
+		BEGIN          { e = 1 } \
+		$1 == "do"     { e = 1 } \
+		$1 == "don\'t" { e = 0 } \
+		               { sum += e * ($2 * $3) } \
+		END            { print "Part two " sum } \
+	'
+