add a basic spinner to the project

Author: GrantBirki

internal/cmd/root.go

@@ -2,6 +2,9 @@ package cmd
 
 import (
 	"fmt"
+	"os"
+	"os/signal"
+	"time"
 
 	"github.com/github/gh-combine/internal/version"
 )
@@ -13,5 +16,29 @@ func Run() error {
 		return fmt.Errorf("oh no")
 	}
 
+	spinner := NewSpinner("")
+	// Ensure the spinner is stopped before exiting the function.
+	// If reference to `spinner` is changed, the reference to the new
+	// spinner will be used to stop the spinner, so this works as
+	// expected even in that case.
+	defer func() { spinner.Stop() }()
+
+	// Set up a channel to catch `Ctrl+C` (SIGINT) signals
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan, os.Interrupt)
+	defer signal.Stop(signalChan)
+
+	// Start a goroutine to handle the signal
+	go func() {
+		<-signalChan
+		Logger.Debug("Received SIGINT (Ctrl+C), stopping spinner and exiting...")
+		spinner.Stop()
+		os.Exit(1) // Exit with a non-zero code to indicate interruption
+	}()
+
+	// for initial testing, just sleep for 1 second and stop the spinner
+	time.Sleep(1 * time.Second)
+	spinner.Stop()
+
 	return nil
 }

internal/cmd/spinner.go

@@ -0,0 +1,40 @@
+package cmd
+
+import (
+	"time"
+
+	"github.com/briandowns/spinner"
+)
+
+type Spinner struct {
+	spinner *spinner.Spinner
+}
+
+func NewSpinner(message string) *Spinner {
+	dotStyle := spinner.CharSets[11]
+	color := spinner.WithColor("fgCyan")
+	duration := 60 * time.Millisecond
+	spinner := spinner.New(dotStyle, duration, color)
+	if message != "" {
+		spinner.Suffix = " " + message
+	}
+	spinner.Start()
+
+	return &Spinner{
+		spinner: spinner,
+	}
+}
+
+func (s *Spinner) Stop() {
+	defer func() {
+		if r := recover(); r != nil {
+			s.spinner.Stop()
+			panic(r) // Re-raise the panic after stopping the spinner
+		}
+	}()
+	s.spinner.Stop()
+}
+
+func (s *Spinner) Suffix(message string) {
+	s.spinner.Suffix = " " + message
+}