[bash] Solve Day 2

bash/day2.sh

@@ -0,0 +1,60 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+sumNumbers() {
+    local sum
+    sum=0
+    while IFS= read -r num || [[ -n "$num" ]]; do
+        sum=$(( "$sum" + "$num" ))
+    done
+    echo "$sum"
+}
+
+gameIds () {
+    sed 's|Game \(.*\): .*|\1|'
+}
+
+maxColour() {
+    local colour counts
+    colour=$1
+    counts=$(echo "0 $colour"
+             sed 's|Game .*: ||;
+                  s|, |\n|g;
+                  s|; |\n|g' |
+                 grep "$colour")
+    sort --general-numeric-sort <<< "$counts" |
+        tail -1 |
+        sed "s| $colour||"
+}
+
+gamesWhichFitTheLimit() {
+    local maxReds maxGreens maxBlues
+    while IFS= read -r line || [[ -n "$line" ]]; do
+        maxReds=$(maxColour "red" <<< "$line")
+        maxGreens=$(maxColour "green" <<< "$line")
+        maxBlues=$(maxColour "blue" <<< "$line")
+        if [[ "$maxReds" -le 12 ]] && [[ "$maxGreens" -le 13 ]] && [[ "$maxBlues" -le 14 ]]; then
+            echo "$line"
+        fi
+    done
+}
+
+powers () {
+    local maxReds maxGreens maxBlues
+    while IFS= read -r line || [[ -n "$line" ]]; do
+        maxReds=$(maxColour "red" <<< "$line")
+        maxGreens=$(maxColour "green" <<< "$line")
+        maxBlues=$(maxColour "blue" <<< "$line")
+        echo "$(( "$maxReds" * "$maxGreens" * "$maxBlues"))"
+    done
+}
+
+main () {
+    local input
+    input=$(cat)
+    echo "Part 1 Answer: $(<<<"$input" gamesWhichFitTheLimit | gameIds | sumNumbers)"
+    echo "Part 2 Answer: $(<<<"$input" powers | sumNumbers)"
+}
+
+main