izapple2/frontend/console/main.go

113 lines
2.0 KiB
Go
Raw Normal View History

package main
import (
"bufio"
"fmt"
"os"
"strings"
"time"
2020-10-03 21:38:26 +00:00
apple2 "github.com/ivanizag/izapple2"
)
func main() {
a := apple2.MainApple()
fe := &ansiConsoleFrontend{}
a.SetKeyboardProvider(fe)
go fe.textModeGoRoutine(a)
a.Run()
}
/*
Uses the console standard input and output to interface with the machine.
Input is buffered until the next CR. This avoids working in place, a line
for input is added at the end.
Outut is done in place using ANSI escape sequences.
Those tricks do not work with the Apple2e ROM
*/
type ansiConsoleFrontend struct {
keyChannel chan uint8
extraLineFeeds chan int
lastContent string
}
const refreshDelayMs = 100
func (fe *ansiConsoleFrontend) GetKey(strobed bool) (key uint8, ok bool) {
// Init the first time
if fe.keyChannel == nil {
stdinReader := func(c chan uint8) {
reader := bufio.NewReader(os.Stdin)
for {
key, err := reader.ReadByte()
if err != nil {
fmt.Println(err)
return
}
if key == 10 {
key = 13
if fe.extraLineFeeds != nil {
fe.extraLineFeeds <- 1
}
}
c <- key
}
}
fe.keyChannel = make(chan uint8, 100)
go stdinReader(fe.keyChannel)
}
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
}
func ansiCursorUp(steps int) string {
return fmt.Sprintf("\033[%vA", steps)
}
func (fe *ansiConsoleFrontend) textModeGoRoutine(a *apple2.Apple2) {
fe.extraLineFeeds = make(chan int, 100)
fmt.Printf(strings.Repeat("\n", 24+3))
for {
// Go up
content := ansiCursorUp(24 + 3)
done := false
for !done {
select {
case lineFeeds := <-fe.extraLineFeeds:
content += ansiCursorUp(lineFeeds)
default:
done = true
}
}
content += apple2.DumpTextModeAnsi(a)
content += "\033[KLine: "
if content != fe.lastContent {
fmt.Print(content)
fe.lastContent = content
}
time.Sleep(refreshDelayMs * time.Millisecond)
}
}