From 1c5175f911e188836e7c9a85e63da0aef35dcda8 Mon Sep 17 00:00:00 2001
From: "Adam D. Ruppe" <destructionator@gmail.com>
Date: Mon, 19 Nov 2018 11:41:35 -0500
Subject: [PATCH] terminal + sdpy integration

---
 simpledisplay.d | 59 ++++++++++++++++++++++++++++++++++++++++++++++++-
 terminal.d      | 18 +++++++++++++++
 2 files changed, 76 insertions(+), 1 deletion(-)

diff --git a/simpledisplay.d b/simpledisplay.d
index 3d63a46..921a78d 100644
--- a/simpledisplay.d
+++ b/simpledisplay.d
@@ -2584,6 +2584,12 @@ struct EventLoop {
 	this(long pulseTimeout, void delegate() handlePulse) {
 		if(impl is null)
 			impl = new EventLoopImpl(pulseTimeout, handlePulse);
+		else {
+			if(pulseTimeout) {
+				impl.pulseTimeout = pulseTimeout;
+				impl.handlePulse = handlePulse;
+			}
+		}
 		impl.refcount++;
 	}
 
@@ -2954,7 +2960,10 @@ struct EventLoopImpl {
 				SimpleWindow.processAllCustomEvents(); // anyway
 				enum WAIT_OBJECT_0 = 0;
 				if(waitResult >= WAIT_OBJECT_0 && waitResult < handles.length + WAIT_OBJECT_0) {
-					// process handles[waitResult - WAIT_OBJECT_0];
+					auto h = handles[waitResult - WAIT_OBJECT_0];
+					if(auto e = h in WindowsHandleReader.mapping) {
+						(*e).ready();
+					}
 				} else if(waitResult == handles.length + WAIT_OBJECT_0) {
 					// message ready
 					while(PeekMessage(&message, null, 0, 0, PM_NOREMOVE)) // need to peek since sometimes MsgWaitForMultipleObjectsEx returns even though GetMessage can block. tbh i don't fully understand it but the docs say it is foreground activation
@@ -3991,6 +4000,54 @@ class Timer {
 }
 }
 
+version(Windows)
+/// Lets you add HANDLEs to the event loop. Not meant to be used for async I/O per se, but for other handles (it can only handle a few handles at a time.)
+class WindowsHandleReader {
+	///
+	this(void delegate() onReady, HANDLE handle) {
+		this.onReady = onReady;
+		this.handle = handle;
+
+		mapping[handle] = this;
+
+		enable();
+	}
+
+	///
+	void enable() {
+		auto el = EventLoop.get().impl;
+		el.handles ~= handle;
+	}
+
+	///
+	void disable() {
+		auto el = EventLoop.get().impl;
+		for(int i = 0; i < el.handles.length; i++) {
+			if(el.handles[i] is handle) {
+				el.handles[i] = el.handles[$-1];
+				el.handles = el.handles[0 .. $-1];
+				return;
+			}
+		}
+	}
+
+	void dispose() {
+		disable();
+		mapping.remove(handle);
+		handle = null;
+	}
+
+	void ready() {
+		if(onReady)
+			onReady();
+	}
+
+	HANDLE handle;
+	void delegate() onReady;
+
+	__gshared WindowsHandleReader[HANDLE] mapping;
+}
+
 version(linux)
 /// Lets you add files to the event loop for reading. Use at your own risk.
 class PosixFdReader {
diff --git a/terminal.d b/terminal.d
index fb8390e..49ab246 100644
--- a/terminal.d
+++ b/terminal.d
@@ -1579,6 +1579,24 @@ struct RealTimeConsoleInput {
 		}
 	}
 
+	void fdReadyReader() {
+		auto queue = readNextEvents();
+		foreach(event; queue)
+			userEventHandler(event);
+	}
+
+	void delegate(InputEvent) userEventHandler;
+
+	void integrateWithSimpleDisplayEventLoop()(void delegate(InputEvent) userEventHandler) {
+		this.userEventHandler = userEventHandler;
+		import arsd.simpledisplay;
+		version(Windows)
+			auto listener = new WindowsHandleReader(&fdReadyReader, terminal.hConsole);
+		else version(linux)
+			auto listener = new PosixFdReader(&fdReadyReader, fdIn);
+		else static assert(0, "sdpy event loop integration not implemented on this platform");
+	}
+
 	version(with_eventloop) {
 		version(Posix)
 		void signalFired(SignalFired) {