From 7a8a1464b3144e765f4430245e161bea39832673 Mon Sep 17 00:00:00 2001
From: ubq323 <ubq323@ubq323.website>
Date: Sun, 12 Nov 2023 01:00:48 +0000
Subject: initial

---
 main.ha | 91 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 ui.ha   | 39 ++++++++++++++++++++++++++++
 2 files changed, 130 insertions(+)
 create mode 100644 main.ha
 create mode 100644 ui.ha

diff --git a/main.ha b/main.ha
new file mode 100644
index 0000000..9009947
--- /dev/null
+++ b/main.ha
@@ -0,0 +1,91 @@
+use math::random;
+
+type player = struct {
+	x: int,
+	y: int,
+};
+
+type wall = void;
+type floor = void;
+
+type tile = (wall | floor);
+
+type room = struct {
+	w: size,
+	h: size,
+	tiles: []tile,
+};
+
+fn tile_at(r: room, x: size, y: size) tile = {
+	const ix = x+(r.w*y);
+	return r.tiles[ix];
+};
+
+fn set_tile_at(r: room, x: size, y: size, t: tile) void = {
+	const ix = x+(r.w*y);
+	r.tiles[ix] = t;
+};
+
+fn tile_repr(t: tile) str = match (t) {
+	case wall => yield  "\x1b[90m\u2588";
+	case floor => yield "\x1b[37m.";
+};
+
+fn draw_room(r: room) void = {
+	assert(r.w < 20);
+	assert(r.h < 20);
+	for (let x = 0z; x < r.w; x+=1)
+		for (let y = 0z; y < r.h; y+=1)
+			put_at(x:int,y:int, tile_repr(tile_at(r,x,y)));
+};
+
+
+export fn main() void = {
+	const term = setup_term();
+
+	const tiles: [100]tile = [floor...];
+	const room = room { w=10, h=10, tiles=tiles };
+
+	for (let i = 0z; i < 10; i+=1) {
+		set_tile_at(room, 0, i, wall);
+		set_tile_at(room, 9, i, wall);
+		set_tile_at(room, i, 0, wall);
+		set_tile_at(room, i, 9, wall);
+	};
+
+	let rand = random::init(12345);
+	for (let i = 0; i < 6; i+=1) {
+		const x = (random::u64n(&rand, 9)+1): size;
+		const y = (random::u64n(&rand, 9)+1): size;
+		set_tile_at(room, x,y, wall);
+	};
+
+
+
+
+	let player = player { x=1, y=1 };
+	for (true) {
+		clear();
+		draw_room(room);
+		put_at(player.x, player.y, "@");
+		const c = get_key(): rune;
+		let nx = player.x;
+		let ny = player.y;
+		switch (c) {
+			case 'h' =>	nx -= 1;
+			case 'l' => nx += 1;
+			case 'j' => ny += 1;
+			case 'k' => ny -= 1;
+			case 'q' => break;
+			case => yield;
+		};
+		if (tile_at(room, nx:size, ny:size) is floor) {
+			player.x = nx;
+			player.y = ny;
+		};
+	};
+
+	finish_term(&term);
+};
+
+
diff --git a/ui.ha b/ui.ha
new file mode 100644
index 0000000..31a1865
--- /dev/null
+++ b/ui.ha
@@ -0,0 +1,39 @@
+use fmt;
+use io;
+use os;
+use unix::tty;
+
+fn clear() void = {
+	fmt::fprint(os::stdout_file, "\x1b[H\x1b[2J\x1b[3J")!;
+};
+
+fn put_at(x: int, y: int, s: str) void = {
+	// 0 indexed!
+	fmt::fprintf(os::stdout_file, "\x1b[{};{}H{}", y+1,x+1, s)!;
+};
+
+fn get_key() u8 = {
+	// bad
+	let b = [0u8];
+	io::read(os::stdin_file, b)!;
+	return b[0];
+};
+
+fn setup_term() tty::termios = {
+	const term = tty::termios_query(os::stdin_file)!;
+	tty::makeraw(&term)!;
+
+	// alternate screen, hide cursor
+	fmt::fprint(os::stdout_file, "\x1b[?1049h\x1b[?25l")!;
+
+	clear();
+
+	return term;
+};
+
+fn finish_term(term: *tty::termios) void = {
+	// normal screen, show cursor
+	fmt::fprint(os::stdout_file, "\x1b[?1049l\x1b[?25h")!;
+
+	tty::termios_restore(term);
+};
-- 
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