--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/cmd/madon.go	Wed Apr 19 19:08:47 2017 +0200
@@ -0,0 +1,115 @@
+// Copyright © 2017 Mikael Berthe <mikael@lilotux.net>
+//
+// Licensed under the MIT license.
+// Please see the LICENSE file is this directory.
+
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/McKael/madon"
+	"github.com/spf13/viper"
+)
+
+var scopes = []string{"read", "write", "follow"}
+
+func madonInit(signIn bool) error {
+	if gClient == nil {
+		if err := madonInitClient(); err != nil {
+			return err
+		}
+	}
+	if signIn {
+		return madonLogin()
+	}
+	return nil
+}
+
+func madonInitClient() error {
+	if gClient != nil {
+		return nil
+	}
+	var err error
+
+	// Overwrite variables using Viper
+	instanceURL = viper.GetString("instance")
+	appID = viper.GetString("app_id")
+	appSecret = viper.GetString("app_secret")
+
+	if instanceURL == "" {
+		return errors.New("no instance provided")
+	}
+
+	if appID != "" && appSecret != "" {
+		// We already have an app key/secret pair
+		gClient, err = madon.RestoreApp(AppName, instanceURL, appID, appSecret, nil)
+		if err != nil {
+			return err
+		}
+		// Check instance
+		if _, err := gClient.GetCurrentInstance(); err != nil {
+			return fmt.Errorf("could not use provided app secrets")
+		}
+		if verbose {
+			errPrint("Using provided app secrets")
+		}
+		return nil
+	}
+
+	if appID != "" || appSecret != "" {
+		errPrint("Warning: provided app id/secrets incomplete -- registering again")
+	}
+
+	gClient, err = madon.NewApp(AppName, scopes, madon.NoRedirect, instanceURL)
+	if err != nil {
+		return fmt.Errorf("app registration failed: %s", err.Error())
+	}
+
+	errPrint("Registred new application.")
+	return nil
+}
+
+func madonLogin() error {
+	if gClient == nil {
+		return errors.New("application not registred")
+	}
+
+	token = viper.GetString("token")
+	login = viper.GetString("login")
+	password = viper.GetString("password")
+
+	if token != "" { // TODO check token validity?
+		if verbose {
+			errPrint("Reusing existing token.")
+		}
+		gClient.SetUserToken(token, login, password, []string{})
+		return nil
+	}
+
+	err := gClient.LoginBasic(login, password, scopes)
+	if err == nil {
+		return nil
+	}
+	return fmt.Errorf("login failed: %s", err.Error())
+}
+
+// splitIDs splits a list of IDs into an int array
+func splitIDs(ids string) (list []int, err error) {
+	var i int
+	if ids == "" {
+		return
+	}
+	l := strings.Split(ids, ",")
+	for _, s := range l {
+		i, err = strconv.Atoi(s)
+		if err != nil {
+			return
+		}
+		list = append(list, i)
+	}
+	return
+}