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package moe.nea89.website
import kotlinx.browser.document
import kotlinx.html.dom.append
import kotlinx.html.dom.create
import kotlinx.html.js.p
import kotlinx.html.js.pre
import kotlinx.html.js.span
import org.w3c.dom.HTMLElement
import org.w3c.dom.HTMLParagraphElement
import org.w3c.dom.HTMLPreElement
import org.w3c.dom.events.KeyboardEvent
import kotlin.collections.set
class KConsole(
private val root: HTMLElement,
private val text: HTMLPreElement,
private val prompt: HTMLElement,
fileSystem: KFileSystem?,
) {
val fileAccessor = fileSystem?.let { FileAccessor(it) }
companion object {
val shlexRegex =
""""([^"\\]+|\\.)+"|([^ "'\\]+|\\.)+|'([^'\\]+|\\.)+'""".toRegex()
fun createFor(element: HTMLElement, fileSystem: KFileSystem? = null): KConsole {
val text = element.append.pre()
val prompt = text.append.p()
element.classList.add(Styles.consoleClass)
val console = KConsole(element, text, prompt, fileSystem)
document.body!!.onkeydown = console::keydown
console.addLine("Starting up terminal.")
console.rerender()
return console
}
}
enum class ConsoleState {
SHELLPROMPT,
IN_PROGRAM
}
var state = ConsoleState.SHELLPROMPT
var input: String = ""
fun addLines(newLines: List<String>) {
newLines.forEach { addLine(it) }
}
fun addMultilineText(text: String) {
addLines(text.split("\n"))
}
fun addLine(vararg elements: Any) {
addLine(document.create.p().apply {
elements.forEach {
when (it) {
is HTMLElement -> append(it)
is ColoredElement -> append(document.create.span().also { el ->
el.style.color = it.color.color.toString()
el.append(it.text)
})
is String -> append(it)
else -> throw RuntimeException("Unknown element")
}
}
})
}
private fun addLine(element: HTMLParagraphElement) {
text.insertBefore(element, prompt)
}
fun rerender() {
if (state == KConsole.ConsoleState.SHELLPROMPT) {
prompt.innerText = "${'$'} $input"
} else {
prompt.innerText = ""
}
}
fun scrollDown() {
text.lastElementChild?.scrollIntoView()
}
fun registerCommand(command: Command) {
command.aliases.forEach {
commands[it] = command
}
commands[command.name] = command
}
val commands = mutableMapOf<String, Command>()
fun executeCommand(commandLine: String) {
val parts = shlex(commandLine)
if (parts == null) {
addLine("Syntax Error")
return
}
if (parts.isEmpty()) {
return
}
val command = parts[0]
println("Running command: $command")
val arguments = parts.drop(1)
val commandThing = commands[command]
if (commandThing == null) {
addLine("Unknown command")
return
}
ShellExecutionContext.run(this, commandThing, command, arguments)
}
@OptIn(ExperimentalStdlibApi::class)
fun shlex(command: String): List<String>? {
var i = 0
val parts = mutableListOf<String>()
while (i < command.length) {
val match = shlexRegex.matchAt(command, i)
if (match == null) {
println("Could not shlex: $command")
return null
}
// TODO: Proper string unescaping
parts.add(match.groupValues.drop(1).firstOrNull { it != "" } ?: "")
i += match.value.length
while (command[i] == ' ' && i < command.length)
i++
}
return parts
}
fun keydown(event: KeyboardEvent) {
if (event.altKey || event.ctrlKey || event.metaKey) return
if (event.isComposing || event.keyCode == 229) return
if (state != ConsoleState.SHELLPROMPT) return
when (event.key) {
"Enter" -> {
val toExecute = input
addLine("${'$'} $toExecute")
input = ""
executeCommand(toExecute)
}
"Backspace" -> input = input.substring(0, input.length - 1)
else ->
if (event.key.length == 1 || event.key.any { it !in 'a'..'z' && it !in 'A'..'Z' })
input += event.key
}
event.preventDefault()
rerender()
scrollDown()
}
}
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