cmd: Implement cli to run puzzles

Author: obalunenko

cmd/main.go

@@ -0,0 +1,70 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"log"
+	"os"
+	"path/filepath"
+	"strconv"
+
+	"github.com/pkg/errors"
+
+	"github.com/oleg-balunenko/advent-of-code/internal/puzzle"
+	_ "github.com/oleg-balunenko/advent-of-code/internal/solutions/day01"
+)
+
+var (
+	inputDir = flag.String(
+		"input_dir",
+		filepath.Join(os.Getenv("GOPATH"), "src", "github.com", "oleg-balunenko", "advent-of-code", "input"),
+		"Path to directory with puzzles input files")
+)
+
+func main() {
+	flag.Parse()
+
+	menu()
+}
+
+func menu() {
+	fmt.Println("Menu:")
+
+	solvers := puzzle.Solvers()
+
+	var choices = make(map[string]string, len(solvers))
+
+	for i, s := range solvers {
+		choices[strconv.Itoa(i+1)] = s
+		fmt.Printf("%d. %s \n", i+1, s)
+	}
+
+	var text string
+
+	for {
+		_, err := fmt.Scanln(&text)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		if pname, ok := choices[text]; !ok {
+			fmt.Println("wrong choice, try again")
+		} else {
+			run(pname)
+			return
+		}
+	}
+}
+
+func run(name string) {
+	s, err := puzzle.GetSolver(name)
+	if err != nil {
+		log.Fatal(errors.Wrap(err, "failed to get solver"))
+	}
+
+	input := filepath.Join(*inputDir, fmt.Sprintf("%s.txt", name))
+
+	if err := puzzle.Run(s, input); err != nil {
+		log.Fatal(errors.Wrap(err, "failed to run puzzle solver"))
+	}
+}