added scripts and 2020 folder

scripts/template/template.go

@@ -0,0 +1,89 @@
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"text/template"
+
+	"github.com/alexchao26/advent-of-code-go/scripts/fetchers"
+	"github.com/alexchao26/advent-of-code-go/util"
+)
+
+type TemplateData struct {
+	Year int
+	Day  string // a string to include the prefixing zero
+}
+
+var testTemplateString = `package aoc{{.Year}}
+
+import (
+	"testing"
+	
+	"github.com/alexchao26/advent-of-code-go/util"
+)
+
+func TestDay{{.Day}}Part1(t *testing.T) {
+	// Run actual problem input
+	day{{.Day}}Part1(util.ReadFile("./day{{.Day}}-input.txt"))
+}
+
+func TestDay{{.Day}}Part2(t *testing.T) {
+	// Run actual problem input
+	day{{.Day}}Part2(util.ReadFile("./day{{.Day}}-input.txt"))
+}
+`
+
+var solutionTemplateString = `package aoc{{.Year}}
+
+func day{{.Day}}Part1(input string) int {
+	return 0
+}
+
+func day{{.Day}}Part2(input string) int {
+	return 0
+}
+`
+
+func main() {
+	day, year, _ := fetchers.ParseFlags()
+	data := TemplateData{
+		Year: year,
+		Day:  fmt.Sprintf("%02d", day),
+	}
+
+	testTemp, err := template.New("test-template").Parse(testTemplateString)
+	if err != nil {
+		panic(err)
+	}
+	solutionTemp, err := template.New("solution-template").Parse(solutionTemplateString)
+	if err != nil {
+		panic(err)
+	}
+
+	solutionFilename := filepath.Join(util.Dirname(), "../../", fmt.Sprintf("%d/day%02d.go", year, day))
+	testFilename := filepath.Join(util.Dirname(), "../../", fmt.Sprintf("%d/day%02d_test.go", year, day))
+
+	EnsureNotOverwriting(solutionFilename)
+	EnsureNotOverwriting(testFilename)
+
+	solutionWriter, err := os.Create(solutionFilename)
+	if err != nil {
+		panic(err)
+	}
+	testWriter, err := os.Create(testFilename)
+	if err != nil {
+		panic(err)
+	}
+
+	solutionTemp.Execute(solutionWriter, data)
+	testTemp.Execute(testWriter, data)
+	fmt.Println("templates made")
+}
+
+func EnsureNotOverwriting(filename string) {
+	_, err := os.Stat(filename)
+	if err == nil {
+		panic(fmt.Sprintf("File already exists: %s", filename))
+	}
+}