day 17

TODO.md

@@ -2,3 +2,4 @@
 * Write more unit tests
 * Try out clipperhouse/gen library
 * Try out urfave/cli library
+* Get the second stars from day 14 and beyond

day-17/main.go

@@ -0,0 +1,113 @@
+/* Day 17: Trick Shot */
+// This question is written very strange. Skipping for now
+package main
+
+import (
+	"AoC2021/utils/args"
+	"AoC2021/utils/log"
+	"AoC2021/utils/timer"
+	"bufio"
+	"os"
+	"regexp"
+	"strconv"
+)
+
+func check(e error) {
+	if e != nil {
+		log.Println(log.DEBUG, "Oh snap!")
+		panic(e)
+	}
+}
+
+const XMIN = 20
+const XMAX = 30
+const YMIN = -10
+const YMAX = -5
+
+func main() {
+	argMap := args.Parse(os.Args)
+	log.SetLogLevelFromArgs(argMap)
+	selectedPart, partSpecified := argMap["part"]
+
+	log.Println(log.NORMAL, "--- Day 17: Trick Shot ---")
+	timer.Start()
+
+	if !partSpecified || selectedPart == "" || selectedPart == "1" {
+		part1()
+		timer.Tick()
+		log.Println(log.NORMAL)
+	}
+
+	if !partSpecified || selectedPart == "" || selectedPart == "2" {
+		part2()
+		timer.Tick()
+		log.Println(log.NORMAL)
+	}
+}
+
+func part1() {
+	log.Println(log.NORMAL, "* Part 1 *")
+	log.Println(log.NORMAL, " Goal: How high can you make the probe go while still reaching the target area?")
+	log.Println(log.NORMAL, " Answer: What is the highest y position it reaches on this trajectory?")
+
+	x1, x2, y1, y2 := parseInputFile()
+
+	drawGrid(x1, x2, y1, y2)
+
+	log.Printf(log.NORMAL, "Read values from input. x: %d..%d, y: %d..%d\n", x1, x2, y1, y2)
+	log.Printf(log.NORMAL, "The solution is %d\n", 42)
+}
+
+func part2() {
+	log.Println(log.NORMAL, "* Part 2 *")
+	log.Println(log.NORMAL, " Goal: ")
+	log.Println(log.NORMAL, " Answer: ")
+}
+
+func parseInputFile() (int, int, int, int) {
+
+	input, err := os.Open("./input.txt")
+	check(err)
+	defer input.Close()
+
+	scanner := bufio.NewScanner(input)
+
+	if !scanner.Scan() {
+		panic("failed to load input data")
+	}
+
+	r, _ := regexp.Compile("target area: x=(-?[0-9]+)..(-?[0-9]+), y=(-?[0-9]+)..(-?[0-9]+)")
+	matches := r.FindStringSubmatch(scanner.Text())
+	if len(matches) != 5 {
+		panic("failed to parse input data")
+	}
+
+	x1, x2, y1, y2 := 0, 0, 0, 0
+	x1, err = strconv.Atoi(matches[1])
+	check(err)
+	x2, err = strconv.Atoi(matches[2])
+	check(err)
+	y1, err = strconv.Atoi(matches[3])
+	check(err)
+	y2, err = strconv.Atoi(matches[2])
+	check(err)
+
+	return x1, x2, y1, y2
+}
+
+func drawGrid(x1, x2, y1, y2 int) {
+	for y := y1; y <= y2; y++ {
+		for x := x1; x <= x2; x++ {
+			switch {
+			case x == 0 && y == 0:
+				log.Printf(log.NORMAL, "S")
+			case x >= XMIN && x <= XMAX && y >= YMIN && y <= YMAX:
+				log.Printf(log.NORMAL, "T")
+			default:
+				log.Printf(log.NORMAL, ".")
+			}
+		}
+		log.Println(log.NORMAL)
+	}
+	log.Println(log.NORMAL)
+}

day-17/main_test.go

@@ -0,0 +1,11 @@
+package main
+
+import (
+	"AoC2021/utils/assert"
+	"testing"
+)
+
+func TestDay17(t *testing.T) {
+	assert.IsTrue(t, true, "cool")
+	assert.EqualsStr(t, "foo", "bar", "baz")
+}

main.go.template

@@ -2,6 +2,7 @@
 package main
 
 import (
+	"AoC2021/utils/args"
 	"AoC2021/utils/log"
 	"AoC2021/utils/timer"
 	"bufio"
@@ -17,15 +18,24 @@ func check(e error) {
 }
 
 func main() {
+	argMap := args.Parse(os.Args)
+	log.SetLogLevelFromArgs(argMap)
+	selectedPart, partSpecified := argMap["part"]
+
 	log.Println(log.NORMAL, "--- Day #DAY#: #TITLE# ---")
 	timer.Start()
+
+	if !partSpecified || selectedPart == "" || selectedPart == "1" {
 		part1()
 		timer.Tick()
 		log.Println(log.NORMAL)
+	}
 
+	if !partSpecified || selectedPart == "" || selectedPart == "2" {
 		part2()
 		timer.Tick()
 		log.Println(log.NORMAL)
+	}
 }
 
 func part1() {