mvp

main.go

@@ -0,0 +1,101 @@
+package main
+
+import (
+	// "fmt"
+	"bufio"
+	"io"
+	"os"
+	"os/exec"
+	"time"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/app"
+	"fyne.io/fyne/v2/container"
+	"fyne.io/fyne/v2/layout"
+	"fyne.io/fyne/v2/widget"
+	"github.com/creack/pty"
+)
+
+const MaxBufferSize = 16
+
+func main() {
+	a := app.New()
+	w := a.NewWindow("germ")
+
+	ui := widget.NewTextGrid()
+
+	os.Setenv("TERM", "dumb")
+
+	c := exec.Command("/bin/bash")
+	p, err := pty.Start(c)
+	if err != nil {
+		fyne.LogError("Failed to open pty", err)
+		os.Exit(1)
+	}
+	defer c.Process.Kill()
+
+	onTypedKey := func(key *fyne.KeyEvent) {
+		if key.Name == fyne.KeyEnter || key.Name == fyne.KeyReturn {
+			_, _ = p.Write([]byte{'\r'})
+		}
+	}
+
+	onTypedRune := func(r rune) {
+		p.Write([]byte(string(r)))
+	}
+
+	w.Canvas().SetOnTypedKey(onTypedKey)
+	w.Canvas().SetOnTypedRune(onTypedRune)
+
+	buffer := [][]rune{}
+	reader := bufio.NewReader(p)
+
+	// Goroutine that reads from pty
+	go func() {
+		line := []rune{}
+		buffer = append(buffer, line)
+		for {
+			r, _, err := reader.ReadRune()
+
+			if err != nil {
+				if err == io.EOF {
+					return
+				}
+				os.Exit(0)
+			}
+
+			line = append(line, r)
+			buffer[len(buffer)-1] = line
+			if r == '\n' {
+				if len(buffer) > MaxBufferSize { // If the buffer is at capacity...
+					buffer = buffer[1:] // ...pop the first line in the buffer
+				}
+
+				line = []rune{}
+				buffer = append(buffer, line)
+			}
+		}
+	}()
+
+	// Goroutine that renders to UI
+	go func() {
+		for {
+			time.Sleep(100 * time.Millisecond)
+			ui.SetText("")
+			var lines string
+			for _, line := range buffer {
+				lines = lines + string(line)
+			}
+			ui.SetText(string(lines))
+		}
+	}()
+
+	// Create a new container with a wrapped layout
+	// set the layout width to 420, height to 200
+	w.SetContent(container.New(
+		layout.NewGridWrapLayout(fyne.NewSize(900, 325)),
+		ui,
+	))
+
+	w.ShowAndRun()
+}