Add ExitCode to the "Exited" message

start/process.go

@@ -26,6 +26,7 @@ type process struct {
 	dead         bool
 	interrupted  bool
 	restart      bool
+	paneID       string
 
 	tmux *tmuxClient
 
@@ -175,7 +176,8 @@ func (p *process) observe() {
 		if !p.Running() {
 			if !p.keepingAlive {
 				p.out.Close()
-				p.output.WriteBoldLine(p, []byte("Exited"))
+
+				p.reportExitCode()
 				p.keepingAlive = true
 			}
 
@@ -209,3 +211,10 @@ func (p *process) respawn() {
 	p.waitPid()
 	p.output.WriteBoldLinef(p, "Restarted with pid %v...", p.pid)
 }
+
+func (p *process) reportExitCode() {
+	exitCode := p.tmux.PaneExitCode(p.paneID)
+	message := fmt.Sprintf("Exited with code %d", exitCode)
+
+	p.output.WriteBoldLine(p, []byte(message))
+}

start/tmux.go

@@ -169,6 +169,7 @@ func (t *tmuxClient) mapProcess(pane, name, pid string) {
 		}
 
 		t.processesByPane[pane] = p
+		p.paneID = pane // save the tmux paneID in the process
 
 		if ipid, err := strconv.Atoi(pid); err == nil {
 			p.pid = ipid
@@ -235,3 +236,15 @@ func (t *tmuxClient) Shutdown() {
 	case <-time.After(5 * time.Second):
 	}
 }
+
+func (t *tmuxClient) PaneExitCode(paneID string) int {
+	cmd := exec.Command("tmux", "-L", t.Socket, "display-message", "-p", "-t", "%"+paneID, "#{pane_dead_status}")
+	var out bytes.Buffer
+	cmd.Stdout = &out
+	cmd.Stderr = os.Stderr
+	cmd.Run()
+
+	status, _ := strconv.Atoi(strings.TrimSpace(out.String()))
+
+	return status
+}