feat: add outputFlag

license.go

@@ -14,7 +14,7 @@ const (
 // map template name with filename
 var templates = map[string]templateInfo{
 	"MIT": {
-		filename: "mit",
+		filename: "mit.txt",
 		args: []string{
 			"[year]",
 			"[fullname]",
@@ -27,7 +27,7 @@ type templateInfo struct {
 	args     []string
 }
 
-func generateLicense(name string, values map[string]string) (string, error) {
+func generateLicense(name string) (string, error) {
 	if name == "" {
 		return "", fmt.Errorf("empty license name")
 	}
@@ -47,10 +47,8 @@ func generateLicense(name string, values map[string]string) (string, error) {
 	// Replace template
 	template := string(templateRaw)
 	for _, arg := range templateInfo.args {
-		value, ok := values[arg]
-		if !ok {
-			return "", fmt.Errorf("missing arg %s", arg)
-		}
+		fmt.Printf("What is your %s: ", arg)
+		value := readStdin()
 
 		template = strings.ReplaceAll(template, arg, value)
 	}

main.go

@@ -2,7 +2,9 @@ package main
 
 import (
 	"fmt"
+	"io/ioutil"
 	"os"
+	"path/filepath"
 
 	"github.com/fatih/color"
 	"github.com/urfave/cli/v2"
@@ -11,7 +13,11 @@ import (
 const (
 	appName = "license"
 
-	nameFlag = "name"
+	nameFlag   = "name"
+	outputFlag = "output"
+
+	currentDir      = "."
+	licenseFilename = "LICENSE"
 )
 
 var fmtErr = color.New(color.FgRed)
@@ -28,6 +34,12 @@ func main() {
 				Aliases: []string{"n"},
 				Usage:   "which `LICENSE`",
 			},
+			&cli.StringFlag{
+				Name:        outputFlag,
+				Aliases:     []string{"o"},
+				Usage:       "output directory",
+				DefaultText: currentDir,
+			},
 		},
 		Action: a.Run,
 	}
@@ -41,7 +53,8 @@ func main() {
 
 type action struct {
 	flags struct {
-		name string
+		name   string
+		output string
 	}
 }
 
@@ -53,9 +66,20 @@ func (a *action) Run(c *cli.Context) error {
 
 	a.getFlags(c)
 
+	license, err := generateLicense(a.flags.name)
+	if err != nil {
+		return fmt.Errorf("failed to generate license %s: %w", a.flags.name, err)
+	}
+
+	outputFile := filepath.Join(a.flags.output, licenseFilename)
+	if err := ioutil.WriteFile(outputFile, []byte(license), os.ModePerm); err != nil {
+		return fmt.Errorf("failed to write file %s: %w", outputFile, err)
+	}
+
 	return nil
 }
 
 func (a *action) getFlags(c *cli.Context) {
 	a.flags.name = c.String(nameFlag)
+	a.flags.output = c.String(outputFlag)
 }

stdin.go

@@ -0,0 +1,22 @@
+package main
+
+import (
+	"bufio"
+	"os"
+	"strings"
+)
+
+func readStdin() string {
+	bs := bufio.NewScanner(os.Stdin)
+	for bs.Scan() {
+		line := bs.Text()
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+
+		return line
+	}
+
+	return ""
+}