Add a throbber

config.go

@@ -33,6 +33,7 @@ type ConfigPrintd struct {
 	DelayAfter   time.Duration
 	DelayError   time.Duration
 	LogColor     bool
+	Throbber     bool
 }
 
 func (c *ConfigPrintd) initDefaults() {
@@ -47,6 +48,7 @@ func (c *ConfigPrintd) initDefaults() {
 	c.DelayAfter = 500 * time.Millisecond
 	c.DelayError = 5 * time.Second
 	c.LogColor = true
+	c.Throbber = true
 }
 
 type ConfigPrinter struct {

main.go

@@ -20,6 +20,8 @@ var (
 )
 
 func main() {
+	log.SetPrefix("\033[2K\r")
+
 	fmt.Println(`  ____       _       _      _ 
  |  _ \ _ __(_)_ __ | |_ __| |
 ` + " | |_) | '__| | '_ \\| __/ _` |" + `
@@ -52,6 +54,11 @@ func main() {
 		pulseLoop(cfg, exitch)
 	}()
 
+	throbber := Throbber{}
+	if cfg.Printd.Throbber {
+		go throbber.Loop(cfg, exitch)
+	}
+
 	wg.Add(1)
 	go func() {
 		defer wg.Done()
@@ -61,16 +68,21 @@ func main() {
 		for {
 			pr, err := getNextPrint(ctx, cfg)
 			if errors.As(err, &tophError{}) {
+				throbber.SetState(ThrobberOffline)
 				log.Println(color.RedString("[E]"), err)
 				delay = cfg.Printd.DelayError
 				goto retry
 			}
 			catch(err)
+
 			if pr.ID == "" {
+				throbber.SetState(ThrobberReady)
 				delay = 5 * time.Second
 				goto retry
 			}
 
+			throbber.SetState(ThrobberPrinting)
+
 			log.Printf("[i]"+" Printing %s", pr.ID)
 			err = runPrintJob(ctx, cfg, pr)
 			catch(err)

throbber.go

@@ -0,0 +1,62 @@
+package main
+
+import (
+	"fmt"
+	"log"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/fatih/color"
+)
+
+type Throbber struct {
+	state ThrobberState
+	m     sync.Mutex
+}
+
+func (t *Throbber) SetState(s ThrobberState) {
+	t.m.Lock()
+	t.state = s
+	t.m.Unlock()
+}
+
+func (t *Throbber) Loop(cfg Config, exitch chan struct{}) {
+	pad := strings.Repeat(" ", 20)
+L:
+	for i := 0; ; i = (i + 1) % 10 {
+		var s string
+		t.m.Lock()
+		switch t.state {
+		case ThrobberReady:
+			b := []byte{' '}
+			if i < 5 {
+				b[0] = '~'
+			}
+			s = color.GreenString("[" + string(b) + "]")
+			s += " Ready"
+		case ThrobberPrinting:
+			s = color.BlueString("[~]")
+			s += " Printing"
+		case ThrobberOffline:
+			s = color.RedString("[!]")
+			s += " Offline"
+		}
+		t.m.Unlock()
+		fmt.Fprintf(log.Default().Writer(), "\033[2K\r%s%s\r", pad, s)
+
+		select {
+		case <-exitch:
+			break L
+		case <-time.After(125 * time.Millisecond):
+		}
+	}
+}
+
+type ThrobberState int
+
+const (
+	ThrobberReady ThrobberState = iota
+	ThrobberPrinting
+	ThrobberOffline
+)