feat(lang): Add posibility to generate solution template

For now we only have support for ruby but other languages can be easily
addded.

internal/action.go

@@ -1,9 +1,12 @@
 package internal
 
 import (
+	"embed"
 	"errors"
 	"fmt"
+	"html/template"
 	"io"
+	"log"
 	"log/slog"
 	"net/http"
 	"os"
@@ -30,6 +33,14 @@ type Args struct {
 	Year     int
 }
 
+type templateData struct {
+	year int
+	day  int
+}
+
+//go:embed templates/*.tmpl
+var templateFS embed.FS
+
 func GenerateTemplate(args Args) error {
 	year := args.Year
 	day := args.Day
@@ -63,7 +74,38 @@ func GenerateTemplate(args Args) error {
 			slog.Error("Unable to write input into input.txt", "err", err)
 		}
 	} else {
-		slog.Warn("Skipping downloading input")
+		slog.Warn("Skipping downloading input, file already exist")
+	}
+
+	if args.Language == None {
+		slog.Warn("Skipping code template generation")
+	} else {
+		tmpl, err := loadTemplate(string(args.Language))
+		if err != nil {
+			slog.Error("Error loading template", "err", err)
+			return err
+		}
+
+		if _, err := os.Stat(filepath.Join(path, generateSolutionName(args.Language))); errors.Is(err, os.ErrNotExist) {
+			slog.Warn("Skipping code template generation, file already exist")
+		}
+
+		// Create an output file
+		outputFile, err := os.Create(filepath.Join(path, generateSolutionName(args.Language)))
+		if err != nil {
+			log.Fatalf("Error creating file: %v", err)
+		}
+		defer outputFile.Close()
+
+		// Execute the template with data
+		data := templateData{
+			year: args.Year,
+			day:  args.Day,
+		}
+		err = tmpl.Execute(outputFile, data)
+		if err != nil {
+			log.Fatalf("Error executing template: %v", err)
+		}
 	}
 
 	return nil
@@ -73,6 +115,14 @@ func generatePath(year, day int) string {
 	return filepath.Join(fmt.Sprint(year), fmt.Sprintf("day-%02d", day))
 }
 
+func generateSolutionName(lang Template) string {
+	if lang == Ruby {
+		return "main.rb"
+	}
+	slog.Error("unknown language", "lang", lang)
+	return "main.txt"
+}
+
 func prepareRequest(url string, session Session) (*http.Request, error) {
 	req, err := http.NewRequest(http.MethodGet, url, nil)
 	if err != nil {
@@ -157,3 +207,14 @@ func writeToFile(filePath, content string) error {
 
 	return nil
 }
+
+func loadTemplate(name string) (*template.Template, error) {
+	// Read the template content from the embedded filesystem
+	templateContent, err := templateFS.ReadFile("templates/" + name + ".tmpl")
+	if err != nil {
+		return nil, err
+	}
+
+	// Parse the template from the content
+	return template.New(name).Parse(string(templateContent))
+}

internal/templates/ruby.tmpl

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+require "pry"
+require "minitest/autorun"
+
+def read_file(filename)
+  # Get the directory of the currently executing script
+  # Join the script directory with the filename
+  # Read the content of the file
+  File.read(File.join(__dir__, filename))
+end
+
+def solve(filename)
+  read_file(filename)
+  0
+end
+
+def solve2(filename)
+  read_file(filename)
+  0
+end
+
+class AoCTest < Minitest::Test
+  def test_solve
+    assert solve("test.txt") == 0
+  end
+
+  def test_solve2
+    assert solve2("test.txt") == 0
+  end
+end
+
+puts 'Part1', solve('input.txt')
+puts 'Part2', solve2('input.txt')

main.go

@@ -5,6 +5,7 @@ import (
 	"log/slog"
 	"os"
 	"runtime"
+	"slices"
 	"time"
 
 	"github.com/charmbracelet/log"
@@ -34,6 +35,7 @@ func main() {
 		Flags: []cli.Flag{
 			&cli.StringFlag{
 				Name:     "session",
+				Aliases:  []string{"s"},
 				Usage:    "Session granted by adventofcode.com when you log in",
 				Required: false,
 				EnvVars:  []string{"AOC_SESSION"},
@@ -54,6 +56,23 @@ func main() {
 				Value:       time.Now().Year(),
 				DefaultText: fmt.Sprint(time.Now().Year()),
 			},
+			&cli.StringFlag{
+				Name:     "lang",
+				Aliases:  []string{"l"},
+				Usage:    "Programming language to generate the solution for",
+				Required: false,
+				Value:    "none",
+				Action: func(ctx *cli.Context, v string) error {
+					if v == "" {
+						return nil
+					}
+					allowedValues := []string{string(internal.Ruby)}
+					if slices.Contains(allowedValues, v) {
+						return nil
+					}
+					return fmt.Errorf("Invalid language provided '%v', we currently support: %v", v, allowedValues)
+				},
+			},
 		},
 		Action: func(ctx *cli.Context) error {
 			handler := log.NewWithOptions(os.Stderr, log.Options{
@@ -64,7 +83,8 @@ func main() {
 			session := internal.Session(ctx.String("session"))
 			day := ctx.Int("day")
 			year := ctx.Int("year")
-			slog.SetDefault(slog.New(handler).With("day", day, "year", year))
+			lang := ctx.String("lang")
+			slog.SetDefault(slog.New(handler).With("day", day, "year", year, "lang", lang))
 			if session == "" {
 				slog.Error("The session is required so that you can download your input and part2. see --help")
 				return nil
@@ -89,7 +109,7 @@ func main() {
 				Session:  session,
 				Day:      day,
 				Year:     year,
-				Language: internal.None,
+				Language: internal.Template(lang),
 			}
 			return internal.GenerateTemplate(args)
 		},