added link subcommand

cmd/link.go

@@ -3,6 +3,7 @@ package cmd
 import (
 	"fmt"
 
+	"github.com/derricw/siggo/signal"
 	"github.com/spf13/cobra"
 )
 
@@ -13,8 +14,13 @@ func init() {
 var linkCmd = &cobra.Command{
 	Use:   "link",
 	Short: "link a device",
-	Long:  ``,
+	Long: `Generates a QR code that can be scanned by an existing signal device to link to.
+	Example:
+	$ siggo link work_laptop`,
+	Args: cobra.ExactArgs(1),
 	Run: func(cmd *cobra.Command, args []string) {
 		fmt.Println("linking...")
+		sig := signal.NewSignal(User)
+		sig.Link(args[0])
 	},
 }

go.mod

@@ -4,7 +4,7 @@ go 1.13
 
 require (
 	github.com/gdamore/tcell v1.3.0
-	github.com/pgavlin/femto v0.0.0-20191028012355-31a9964a50b5
+	github.com/mdp/qrterminal/v3 v3.0.0
 	github.com/rivo/tview v0.0.0-20200329194346-7cc182c5846e
 	github.com/sirupsen/logrus v1.2.0
 	github.com/spf13/cobra v0.0.7

model/model.go

@@ -76,8 +76,7 @@ type Message struct {
 
 func (m *Message) String() string {
 	var fromStr = m.From
-	fromLen := len(m.From)
-	template := "%s|%s%s| %" + fmt.Sprintf("%dv", fromLen) + ": %s\n"
+	template := "%s|%s%s| %" + fmt.Sprintf("%dv", len(fromStr)) + ": %s\n"
 	data := fmt.Sprintf(template,
 		// lets come up with a way to avoid the *1000000
 		// Magical Ref Data: Mon Jan 2 15:04:05 MST 2006

signal/signal.go

@@ -6,12 +6,14 @@ import (
 	"encoding/json"
 	"fmt"
 	"io/ioutil"
+	"os"
 	"os/exec"
 	"os/user"
 	"strings"
 	"syscall"
 	"time"
 
+	qr "github.com/mdp/qrterminal/v3"
 	log "github.com/sirupsen/logrus"
 )
 
@@ -95,10 +97,6 @@ func (s *Signal) Exec(args ...string) ([]byte, error) {
 	return out.Bytes(), nil
 }
 
-// Link a device
-// not implemented but wouldn't it be cool
-func (s *Signal) Link() {}
-
 // Version returns the current version of signal-cli
 func (s *Signal) Version() (string, error) {
 	b, err := s.Exec("-v")
@@ -200,6 +198,26 @@ func (s *Signal) SendDbus(dest, msg string) error {
 	return nil
 }
 
+func (s *Signal) Link(deviceName string) error {
+	cmd := exec.Command("signal-cli", "link", "-n", deviceName)
+	out, err := cmd.StdoutPipe()
+	if err != nil {
+		return err
+	}
+	err = cmd.Start()
+	if err != nil {
+		return err
+	}
+	r := bufio.NewReader(out)
+	line, _, err := r.ReadLine()
+	if err != nil {
+		return err
+	}
+	fmt.Printf("link text: %s\n", line)
+	qr.Generate(fmt.Sprintf("%s", line), qr.L, os.Stdout)
+	return cmd.Wait()
+}
+
 func (s *Signal) GetUserData() (*SignalUserData, error) {
 	usr, err := user.Current()
 	if err != nil {