Improved CLI

pw/pw.go

@@ -3,8 +3,6 @@ package pw
 //go:generate go run words_generate.go 
 
 import (
-	"log"
-
 	"strings"
 	"crypto/rand"
 	"math/big"
@@ -37,16 +35,20 @@ func NewGenerator(m Mode, s Strength) Generator {
 	}
 }
 
-func (g Generator) Next() string {
+func (g Generator) Next() (string, error) {
 	n := int(g.Strength)
 	s := []string{}
 	for i := 0; i < n; i++ {
-		s = append(s, g.GenerateWord());
+		w, err := g.GenerateWord()
+		if err != nil {
+			return "", err
+		}
+		s = append(s, w)
 	}
-	return strings.Join(s, " ")
+	return strings.Join(s, " "), nil
 }
 
-func (g Generator) GenerateWord() string {
+func (g Generator) GenerateWord() (string, error) {
 	var wordsList []string
 	if g.Mode == ModeShort {
 		wordsList = WordsShort
@@ -58,7 +60,7 @@ func (g Generator) GenerateWord() string {
 	c := len(wordsList)
 	i, err := rand.Int(rand.Reader, big.NewInt(int64(c)))
 	if err != nil {
-		log.Fatal(err)
+		return "", err
 	}
-	return wordsList[i.Int64()]
+	return wordsList[i.Int64()], nil
 }

pword.go

@@ -2,11 +2,100 @@ package main
 
 import (
 	"fmt"
+	"os"
+	"strconv"
 
 	"github.com/serverwentdown/pword/pw"
+	
+	"github.com/urfave/cli"
 )
 
 func main() {
-	g := pw.NewGenerator(pw.ModeShort, pw.StrengthOnline)
+	app := cli.NewApp()
-	fmt.Println(g.Next())
+
+	app.Name = "pword"
+	app.Usage = "generate secure passwords"
+	app.Version = "0.1.0"
+
+	app.Flags = []cli.Flag {
+		cli.StringFlag{
+			Name: "count, c",
+			Value: "auto",
+			Usage: "Generates `NUM` passwords for you to choose from",
+		},
+		cli.BoolFlag{
+			Name: "1",
+			Usage: "Equivalent to --count 1",
+		},
+		cli.BoolFlag{
+			Name: "stronger",
+			Usage: "Chooses from a list of 7,776 words instead",
+		},
+	}
+
+	app.Commands = []cli.Command{
+		{
+			Name: "online",
+			Usage: "Generates passwords for use on websites",
+			Action: func(c *cli.Context) error {
+				return generate(c, pw.StrengthOnline)
+			},
+		},
+		{
+			Name: "offline",
+			Usage: "Generates passwords for use offline (laptops, encrypted drives)",
+			Action: func(c *cli.Context) error {
+				return generate(c, pw.StrengthOffline)
+			},
+		},
+		{
+			Name: "crypto",
+			Usage: "Generates extremely secure passwords",
+			Action: func(c *cli.Context) error {
+				return generate(c, pw.StrengthCrypto)
+			},
+		},
+		{
+			Name: "recall",
+			Usage: "Utility with autocomplete to help you recall passwords",
+			Action: func(c *cli.Context) error {
+				return recall(c)
+			},
+		},
+	}
+
+	app.Run(os.Args)
+}
+
+func generate(c *cli.Context, strength pw.Strength) error {
+	count := int(strength)
+	countString := c.GlobalString("count")
+	countParsed, err := strconv.ParseUint(countString, 10, 64)
+	if err == nil {
+		count = int(countParsed)
+	}
+	if c.GlobalBool("1") {
+		count = 1
+	}
+
+	mode := pw.ModeShort
+	if c.GlobalBool("stronger") {
+		mode = pw.ModeLong
+	}
+	
+	g := pw.NewGenerator(mode, strength)
+
+	for i := 0; i < count; i++ {
+		pw, err := g.Next()
+		if err != nil {
+			return err
+		}
+		fmt.Println(pw)
+	}
+
+	return nil
+}
+
+func recall(c *cli.Context) error {
+	return nil
 }