+added console spport for lyngio
+added console support to lyng/jlyng CLI +added unicode escapes +created tetris console sample
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@@ -0,0 +1,243 @@
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/*
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* Copyright 2026 Sergey S. Chernov real.sergeych@gmail.com
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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*/
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package net.sergeych.lyngio.console
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import kotlinx.cinterop.*
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import kotlinx.coroutines.delay
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import kotlinx.coroutines.sync.Mutex
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import kotlinx.coroutines.sync.withLock
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import platform.posix.*
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import kotlin.time.Duration.Companion.milliseconds
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import kotlin.time.TimeSource
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internal actual fun getNativeSystemConsole(): LyngConsole = LinuxPosixLyngConsole
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internal object LinuxConsoleKeyDecoder {
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fun decode(firstCode: Int, nextCode: (Long) -> Int?): ConsoleEvent.KeyDown {
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if (firstCode == 27) {
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val next = nextCode(25L)
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if (next == null || next < 0) return key("Escape")
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if (next == '['.code || next == 'O'.code) {
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val sb = StringBuilder()
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sb.append(next.toChar())
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var i = 0
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while (i < 8) {
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val c = nextCode(25L) ?: break
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if (c < 0) break
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sb.append(c.toChar())
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if (c.toChar().isLetter() || c == '~'.code) break
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i += 1
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}
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return keyFromAnsiSequence(sb.toString()) ?: key("Escape")
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}
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val base = decodePlain(next)
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return ConsoleEvent.KeyDown(
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key = base.key,
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code = base.code,
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ctrl = base.ctrl,
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alt = true,
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shift = base.shift,
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meta = false,
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)
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}
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return decodePlain(firstCode)
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}
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private fun decodePlain(code: Int): ConsoleEvent.KeyDown {
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if (code == 3) return ConsoleEvent.KeyDown(key = "c", ctrl = true)
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if (code == 9) return key("Tab")
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if (code == 10 || code == 13) return key("Enter")
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if (code == 32) return key(" ")
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if (code == 127 || code == 8) return key("Backspace")
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val c = code.toChar()
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return if (c in 'A'..'Z') {
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ConsoleEvent.KeyDown(key = c.toString(), shift = true)
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} else {
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key(c.toString())
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}
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}
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private fun keyFromAnsiSequence(seq: String): ConsoleEvent.KeyDown? {
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val letter = seq.lastOrNull() ?: return null
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val shift = seq.contains(";2")
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val alt = seq.contains(";3")
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val ctrl = seq.contains(";5")
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val key = when (letter) {
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'A' -> "ArrowUp"
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'B' -> "ArrowDown"
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'C' -> "ArrowRight"
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'D' -> "ArrowLeft"
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'H' -> "Home"
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'F' -> "End"
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else -> return null
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}
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return ConsoleEvent.KeyDown(key = key, ctrl = ctrl, alt = alt, shift = shift)
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}
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private fun key(name: String): ConsoleEvent.KeyDown = ConsoleEvent.KeyDown(key = name)
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}
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@OptIn(ExperimentalForeignApi::class)
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object LinuxPosixLyngConsole : LyngConsole {
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private val stateMutex = Mutex()
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private var rawModeRequested = false
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private var savedAttrsBlob: ByteArray? = null
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override val isSupported: Boolean
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get() = isatty(STDIN_FILENO) == 1 && isatty(STDOUT_FILENO) == 1
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override suspend fun isTty(): Boolean = isSupported
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override suspend fun geometry(): ConsoleGeometry? = readGeometry()
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override suspend fun ansiLevel(): ConsoleAnsiLevel {
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val colorTerm = (getenv("COLORTERM")?.toKString() ?: "").lowercase()
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val term = (getenv("TERM")?.toKString() ?: "").lowercase()
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return when {
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colorTerm.contains("truecolor") || colorTerm.contains("24bit") -> ConsoleAnsiLevel.TRUECOLOR
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term.contains("256color") -> ConsoleAnsiLevel.ANSI256
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term.isNotBlank() && term != "dumb" -> ConsoleAnsiLevel.BASIC16
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else -> ConsoleAnsiLevel.NONE
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}
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}
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override suspend fun write(text: String) {
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kotlin.io.print(text)
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}
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override suspend fun flush() {
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fflush(null)
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}
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override fun events(): ConsoleEventSource {
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if (!isSupported) {
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return object : ConsoleEventSource {
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override suspend fun nextEvent(timeoutMs: Long): ConsoleEvent? = null
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override suspend fun close() {}
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}
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}
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return object : ConsoleEventSource {
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var closed = false
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var lastGeometry: ConsoleGeometry? = null
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override suspend fun nextEvent(timeoutMs: Long): ConsoleEvent? {
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if (closed) return null
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val started = TimeSource.Monotonic.markNow()
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while (!closed) {
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val g = readGeometry()
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if (g != null && (lastGeometry == null || g.columns != lastGeometry?.columns || g.rows != lastGeometry?.rows)) {
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lastGeometry = g
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return ConsoleEvent.Resize(g.columns, g.rows)
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}
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val rawRequested = stateMutex.withLock { rawModeRequested }
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val pollSliceMs = if (timeoutMs <= 0L) 250L else minOf(250L, timeoutMs)
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if (rawRequested) {
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val ev = readKeyEvent(pollSliceMs)
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if (ev != null) return ev
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} else {
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delay(25)
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}
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if (timeoutMs > 0L && started.elapsedNow() >= timeoutMs.milliseconds) {
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return null
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}
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}
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return null
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}
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override suspend fun close() {
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closed = true
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}
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}
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}
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override suspend fun setRawMode(enabled: Boolean): Boolean {
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if (!isSupported) return false
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return stateMutex.withLock {
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if (enabled) {
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if (rawModeRequested) return@withLock false
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memScoped {
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val attrs = alloc<termios>()
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if (tcgetattr(STDIN_FILENO, attrs.ptr) != 0) return@withLock false
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val saved = ByteArray(sizeOf<termios>().toInt())
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saved.usePinned { pinned ->
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memcpy(pinned.addressOf(0), attrs.ptr, sizeOf<termios>().convert())
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}
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savedAttrsBlob = saved
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attrs.c_lflag = attrs.c_lflag and ICANON.convert<UInt>().inv() and ECHO.convert<UInt>().inv()
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attrs.c_iflag = attrs.c_iflag and IXON.convert<UInt>().inv() and ISTRIP.convert<UInt>().inv()
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attrs.c_oflag = attrs.c_oflag and OPOST.convert<UInt>().inv()
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if (tcsetattr(STDIN_FILENO, TCSANOW, attrs.ptr) != 0) return@withLock false
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}
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rawModeRequested = true
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true
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} else {
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val hadRaw = rawModeRequested
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rawModeRequested = false
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val saved = savedAttrsBlob
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if (saved != null) {
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memScoped {
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val attrs = alloc<termios>()
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saved.usePinned { pinned ->
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memcpy(attrs.ptr, pinned.addressOf(0), sizeOf<termios>().convert())
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}
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tcsetattr(STDIN_FILENO, TCSANOW, attrs.ptr)
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}
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}
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hadRaw
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}
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}
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}
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private fun readGeometry(): ConsoleGeometry? = memScoped {
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val ws = alloc<winsize>()
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if (ioctl(STDOUT_FILENO, TIOCGWINSZ.convert(), ws.ptr) != 0) return null
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val cols = ws.ws_col.toInt()
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val rows = ws.ws_row.toInt()
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if (cols <= 0 || rows <= 0) return null
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ConsoleGeometry(columns = cols, rows = rows)
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}
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private fun readByte(timeoutMs: Long): Int? = memScoped {
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val pfd = alloc<pollfd>()
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pfd.fd = STDIN_FILENO
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pfd.events = POLLIN.convert()
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pfd.revents = 0
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val ready = poll(pfd.ptr, 1.convert(), timeoutMs.toInt())
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if (ready <= 0) return null
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val buf = ByteArray(1)
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val count = buf.usePinned { pinned ->
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read(STDIN_FILENO, pinned.addressOf(0), 1.convert())
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}
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if (count <= 0) return null
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val b = buf[0].toInt()
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if (b < 0) b + 256 else b
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}
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private fun readKeyEvent(timeoutMs: Long): ConsoleEvent.KeyDown? {
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val first = readByte(timeoutMs) ?: return null
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return LinuxConsoleKeyDecoder.decode(first) { timeout ->
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readByte(timeout)
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}
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}
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}
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