feat: Add script to automate task solution setup

Author: Norbiros

.env.example

@@ -0,0 +1 @@
+AOC_SESSION=<session cookie from website>

README.md

@@ -1,3 +1,12 @@
 # ☃️ Advent of Code 2024
 
-My solutions for my second Advent of Code in Go!
+My solutions for my second Advent of Code in Go!
+
+## Usage
+```bash
+# Create template solution file and download input.txt from AoC website
+go run tools/aoc.go
+
+# Run solution
+go run day_<day>/main.go
+```

go.mod

@@ -1,3 +1,5 @@
 module github.com/Norbiros/AoC2024
 
 go 1.23.1
+
+require github.com/joho/godotenv v1.5.1 // indirect

go.sum

@@ -0,0 +1,2 @@
+github.com/joho/godotenv v1.5.1 h1:7eLL/+HRGLY0ldzfGMeQkb7vMd0as4CfYvUVzLqw0N0=
+github.com/joho/godotenv v1.5.1/go.mod h1:f4LDr5Voq0i2e/R5DDNOoa2zzDfwtkZa6DnEwAbqwq4=

tools/aoc.go

@@ -0,0 +1,115 @@
+package main
+
+import (
+	_ "embed"
+	"flag"
+	"fmt"
+	"github.com/joho/godotenv"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"path/filepath"
+	"strings"
+	"time"
+)
+
+//go:embed template.go
+var template string
+
+func main() {
+	err := godotenv.Load()
+	if err != nil {
+		log.Fatal("Error loading .env file")
+	}
+
+	var day, year int
+	var cookie string
+
+	today := time.Now()
+	flag.IntVar(&day, "day", today.Day(), "day number to fetch, 1-25")
+	flag.IntVar(&year, "year", today.Year(), "day of year to fetch")
+	flag.StringVar(&cookie, "cookie", os.Getenv("AOC_SESSION"), "session cookie from website")
+	flag.Parse()
+
+	url := fmt.Sprintf("https://adventofcode.com/%d/day/%d/input", year, day)
+	prefixedDay := fmt.Sprintf("day_%02d", day)
+
+	fmt.Printf("Sending request to %s...\n", url)
+	response, err := sendGetRequest(url, cookie)
+	if err != nil {
+		log.Fatal(err)
+	}
+	stringResponse := string(response)
+	stringResponse = strings.TrimRight(stringResponse, "\n")
+	fmt.Println("Received response!")
+
+	err = writeToFile(filepath.Join(prefixedDay, "input.txt"), stringResponse)
+	if err != nil {
+		log.Fatal("Error writing to file:", err)
+	}
+
+	err = writeToFile(filepath.Join(prefixedDay, "main.go"), template)
+	if err != nil {
+		log.Fatal("Error writing to file:", err)
+	}
+
+	fmt.Println()
+	fmt.Printf("Successfully created all template files for day %d of Advent of Code %d\n", day, year)
+	fmt.Printf("You can view task description here: https://adventofcode.com/%d/day/%d\n", year, day)
+
+}
+
+func sendGetRequest(url, cookie string) ([]byte, error) {
+	client := &http.Client{}
+	req, err := http.NewRequest("GET", url, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	req.AddCookie(&http.Cookie{
+		Name:  "session",
+		Value: cookie,
+	})
+
+	response, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	defer func() {
+		_ = response.Body.Close()
+	}()
+
+	body, err := io.ReadAll(response.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return body, nil
+}
+
+func writeToFile(filePath, content string) error {
+	if _, err := os.Stat(filePath); err == nil {
+		fmt.Println("file already exists:", filePath)
+		return nil
+	}
+
+	dir := filepath.Dir(filePath)
+	if err := os.MkdirAll(dir, os.ModePerm); err != nil {
+		return fmt.Errorf("creating directory: %w", err)
+	}
+
+	file, err := os.Create(filePath)
+	if err != nil {
+		return err
+	}
+	defer func() {
+		_ = file.Close()
+	}()
+
+	if _, err := file.WriteString(content); err != nil {
+		return fmt.Errorf("writing to file: %w", err)
+	}
+	return nil
+}

tools/template.go

@@ -0,0 +1,28 @@
+//go:build ignore
+
+package main
+
+import (
+	_ "embed"
+	"fmt"
+	"log"
+)
+
+//go:embed input.txt
+var input string
+
+func main() {
+	fmt.Println("Solving \"${TASK_TITLE}\"...")
+	fmt.Println("Part 1 result", partOne(input))
+	fmt.Println("Part 2 result", partTwo(input))
+}
+
+func partOne(input string) int {
+	log.Panic("Solution for Part 1 not implemented!")
+	return -1
+}
+
+func partTwo(input string) int {
+	log.Panic("Solution for Part 2 not implemented!")
+	return -1
+}