use cli to create a decent command line app

glide.lock

@@ -1,5 +1,5 @@
-hash: 278ebf659dc6f1d5de92408300483b75e76c9f5d81febc25b83bfc585d7457ad
-updated: 2017-03-10T22:33:54.628681045Z
+hash: 1d7fb4b49ab9cebe25e4d605b7256849d2fb5550372e53dcf1a8dc030d32fce0
+updated: 2017-03-11T20:05:25.966344527Z
 imports:
 - name: github.com/boltdb/bolt
   version: 583e8937c61f1af6513608ccc75c97b6abdf4ff9
@@ -9,11 +9,17 @@ imports:
   version: 6a0bfdde8629a3a3a7418a7eae45c54154692514
 - name: github.com/luksen/maildir
   version: 5297d9c3091c7d4891c9d4f6fa743d500c038d6f
+- name: github.com/urfave/cli
+  version: 9e5b04886c4bfee2ceba1465b8121057355c4e53
 - name: golang.org/x/net
   version: a6577fac2d73be281a500b310739095313165611
   subpackages:
   - html
   - html/atom
+- name: golang.org/x/sys
+  version: 99f16d856c9836c42d24e7ab64ea72916925fa97
+  subpackages:
+  - unix
 testImports:
 - name: github.com/onsi/ginkgo
   version: ab07225d112dc7a93c289ac5b2e12735c2c46035
@@ -48,9 +54,5 @@ testImports:
   - matchers/support/goraph/node
   - matchers/support/goraph/util
   - types
-- name: golang.org/x/sys
-  version: 99f16d856c9836c42d24e7ab64ea72916925fa97
-  subpackages:
-  - unix
 - name: gopkg.in/yaml.v2
   version: a3f3340b5840cee44f372bddb5880fcbc419b46a

glide.yaml

@@ -5,6 +5,7 @@ import:
 - package: github.com/luksen/maildir
 - package: github.com/boltdb/bolt
   version: ^1.3.0
+- package: github.com/urfave/cli
 testImport:
 - package: github.com/onsi/ginkgo
 - package: github.com/onsi/gomega

main.go

@@ -1,10 +1,12 @@
 package main
 
 import (
-	"flag"
+	"errors"
 	"fmt"
 	"log"
 	"os"
+
+	"github.com/urfave/cli"
 )
 
 var (
@@ -13,29 +15,66 @@ var (
 )
 
 func main() {
-
-	// Get the Maildir to be handled and the DB
+	// Get working directory
 	wd, err := os.Getwd()
 	if err != nil {
 		return log.Fatalf("get working directory: %s", err)
 	}
-	maildir := flag.String("maildir", wd+"/Maildir", "Path to the Maildir")
-	database := flag.String("database", wd+"/sisyphus.db", "Path to the sisyphus database")
-	flag.Parse()
 
-	// Load the Maildir
-	mails, err := Index(*maildir)
-	if err != nil {
-		return log.Fatalf("load Maildir content: %s", err)
+	var maildir, database *string
+
+	// Define App
+	app := cli.NewApp()
+	app.Name = "sisyphus"
+	app.HelpName = "Intelligent Junk and Spam Mail Handler"
+	app.Version = "0.0.0"
+	app.Authors = []Author{
+		Author{
+			Name:  "Carlo Strub",
+			Email: "cs@carlostrub.ch",
+		},
+	}
+
+	app.Flags = []cli.Flag{
+		cli.StringFlag{
+			Name:        "maildir",
+			Value:       wd + "/Maildir",
+			Usage:       "Path to the Maildir directory",
+			Destination: &maildir,
+		},
+		cli.StringFlag{
+			Name:        "database",
+			Value:       wd + "/sisyphus.db",
+			Usage:       "Path to the sisyphus database",
+			Destination: &database,
+		},
 	}
 
-	fmt.Println(mails)
+	app.Action = func(c *cli.Context) error {
+		if database == nil {
+			return errors.New("no database selected")
+		}
+		if maildir == nil {
+			return errors.New("no maildir selected")
+		}
 
-	// Open the database
-	db, err := openDB("sisyphus.db", 0600, nil)
-	if err != nil {
-		return log.Fatalf("open database: %s", err)
+		// Load the Maildir
+		mails, err := Index(*maildir)
+		if err != nil {
+			return log.Fatalf("load Maildir content: %s", err)
+		}
+
+		fmt.Println(mails)
+
+		// Open the database
+		db, err := openDB(*database, 0600, nil)
+		if err != nil {
+			return log.Fatalf("open database: %s", err)
+		}
+		defer db.Close()
+
+		return nil
 	}
-	defer db.Close()
 
+	app.Run(os.Args)
 }