Initial commit with command and Day interface

day.go

@@ -0,0 +1,6 @@
+package main
+
+type Day interface {
+	Answer() string
+	FollowUp() string
+}

go.mod

@@ -0,0 +1,3 @@
+module unsupervised.ca/aoc2021
+
+go 1.17

main.go

@@ -0,0 +1,45 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+
+	"unsupervised.ca/aoc2021/one"
+)
+
+func main() {
+	args := os.Args
+
+	if len(args) != 2 {
+		help()
+		return
+	}
+
+	flagParts := strings.Split(args[1], "--")
+	if len(flagParts) != 2 {
+		fmt.Println("Unable to read day from flag")
+	}
+
+	var day Day
+	switch flagParts[1] {
+	case "one":
+		day = one.Init("one/input.txt")
+	default:
+		fmt.Printf("%q does not have a solution.\n", flagParts[1])
+		help()
+		return
+	}
+
+	fmt.Printf("The solution for %q is:\n", flagParts[1])
+	fmt.Println(day.Answer())
+	fmt.Println(day.FollowUp())
+}
+
+func help() {
+	fmt.Println("To execute thatguygriff's solutions for Advent of Code execute the command with the day as a flag")
+	fmt.Println("")
+	fmt.Printf("%s [--one|--two|--three]\n", os.Args[0])
+	fmt.Println("")
+	fmt.Println("If there is no solution for the flagged day this text will be printed.")
+}

one/main.go

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+package one
+
+type One struct {
+}
+
+func Init(filepath string) *One {
+	return nil
+}
+
+func (d *One) Answer() string {
+	return "Hello"
+}
+
+func (d *One) FollowUp() string {
+	return "World!"
+}