Headless experiment

frontend/headless/main.go

@@ -0,0 +1,131 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+
+	"github.com/ivanizag/izapple2"
+	"github.com/ivanizag/izapple2/screen"
+)
+
+func main() {
+	a := izapple2.MainApple()
+	fe := &headLessFrontend{}
+	fe.keyChannel = make(chan uint8, 200)
+	a.SetKeyboardProvider(fe)
+	go a.Run()
+
+	inReader := bufio.NewReader(os.Stdin)
+	running := true
+	for running {
+		fmt.Print("* ")
+		text, err := inReader.ReadString('\n')
+		if err != nil {
+			panic(err)
+		}
+		text = strings.TrimSpace(text)
+		parts := strings.Split(text, " ")
+		command := strings.ToLower(parts[0])
+		switch command {
+		case "exit":
+			a.SendCommand(izapple2.CommandKill)
+			running = false
+
+		case "pts":
+			fallthrough
+		case "printtextscreen":
+			fmt.Print(izapple2.DumpTextModeAnsi(a))
+
+		case "ss":
+			fallthrough
+		case "savescreen":
+			err := screen.SaveSnapshot(a, screen.ScreenModeNTSC, "snapshot.png")
+			if err != nil {
+				fmt.Printf("Error saving screen: %v.\n.", err)
+			} else {
+				fmt.Println("Saving screen 'snapshot.png'")
+			}
+
+		case "ssm":
+			fallthrough
+		case "savescreenmono":
+			err := screen.SaveSnapshot(a, screen.ScreenModePlain, "snapshot.png")
+			if err != nil {
+				fmt.Printf("Error saving screen: %v.\n.", err)
+			} else {
+				fmt.Println("Saving screen 'snapshot.png'")
+			}
+
+		case "k":
+			fallthrough
+		case "key":
+			if len(parts) < 2 {
+				fmt.Println("No key specified.")
+			} else {
+				key := uint8(parts[1][0])
+				fe.keyChannel <- key
+			}
+
+		case "ks":
+			fallthrough
+		case "keys":
+			text := strings.Join(parts[1:], " ")
+			for _, char := range text {
+				fe.keyChannel <- uint8(char)
+			}
+
+		case "kr":
+			text := strings.Join(parts[1:], " ")
+			for _, char := range text {
+				fe.keyChannel <- uint8(char)
+			}
+			fe.keyChannel <- 13
+
+		case "r":
+			fallthrough
+		case "return":
+			fe.keyChannel <- 13
+
+		case "help":
+			fmt.Print(`
+Available commands:
+	Exit: Stops the emulator and quits
+	PrintTextScreen or pts: Prints the text mode screen
+	PrintTextScreen, pts: Prints the text mode screen
+	SaveScreen or ss: Saves the screen with NTSC colors to "snapshot.png"
+	SaveScreenMono or ssm: Saves the monochromatic screen to "snapshot.png"
+	Key or k: Sends a key to the emulator
+	Keys or ks: Sends a string to the emulator
+	Return or r: Sends a return to the emulator
+	Help: Prints this help
+`)
+		default:
+			fmt.Println("Unknown command.")
+		}
+	}
+}
+
+/*
+Uses the console to send commands and queries to an emulated machine.
+*/
+type headLessFrontend struct {
+	keyChannel chan uint8
+}
+
+func (fe *headLessFrontend) GetKey(strobed bool) (key uint8, ok bool) {
+	if !strobed {
+		// We must use the strobe to control the flow from stdin
+		ok = false
+		return
+	}
+
+	select {
+	case key = <-fe.keyChannel:
+		ok = true
+	default:
+		ok = false
+	}
+	return
+}