Use pager to display results

main.go

@@ -3,6 +3,7 @@ package main
 import (
 	"flag"
 	"fmt"
+	"io"
 	"os"
 	"os/exec"
 	"strconv"
@@ -22,6 +23,7 @@ func main() {
 	if settings["interactive"] == "true" {
 		interactiveShell()
 	}
+	fmt.Printf("I am done.\n")
 }
 
 func parseArguments() {
@@ -50,8 +52,28 @@ func showQueue() {
 		fmt.Printf("Error reading: %s\n", err.Error())
 		os.Exit(1)
 	}
+	reader, writer := io.Pipe()
+	pagerDone := make(chan bool)
+	go launchPager(reader, pagerDone)
 	for _, entry := range entries {
-		fmt.Printf("%s\n", entry.String())
+		fmt.Fprintf(writer, "%s\n", entry.String())
+	}
+	writer.Close()
+	// Wait for pager to be closed before continuing the main program
+	<-pagerDone
+}
+
+func launchPager(reader *io.PipeReader, pagerDone chan<- bool) {
+	cmd := exec.Command("less")
+	cmd.Stdin = reader
+	cmd.Stdout = os.Stdout
+	if err := cmd.Start(); err != nil {
+		fmt.Printf("Error launching pager: %s\n", err.Error())
+	}
+	if err := cmd.Wait(); err != nil {
+		fmt.Printf("Error terminating pager: %s\n", err.Error())
+	} else {
+		pagerDone <- true
 	}
 }