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<!doctype html>
<html lang="en-us">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no, viewport-fit=cover">
<title>raylib-jamstack</title>
<style>
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; width: 100%; height: 100%; background: #11111b; overflow: hidden; }
body { font-family: ui-monospace, Menlo, Consolas, "DejaVu Sans Mono", monospace; }
/* Layout: landscape (wide) -> game left, REPL right;
portrait (tall, e.g. phone) -> game top, REPL bottom.
The game canvas is always a square. Switching is driven by the
`orientation` media feature (portrait = height >= width). */
#layout { display: flex; flex-direction: row; width: 100vw; height: 100vh; }
/* Game canvas: square. Landscape -> height-capped (fills the left pane). */
#game-pane {
flex: 0 0 auto; height: 100vh;
display: flex; align-items: center; justify-content: center;
background: #000;
}
canvas {
display: block; border: 0; background: #000;
height: 100vh; aspect-ratio: 1 / 1; max-width: 70vw;
touch-action: none;
}
/* HTML Ruby REPL: fills the remaining space. */
#repl-pane {
flex: 1 1 0; min-width: 0; height: 100vh;
display: flex; flex-direction: column;
background: #181825; color: #cdd6f4;
border-left: 1px solid #313244;
}
/* Portrait (tall viewport, e.g. phone): stack vertically.
Game on top (square, width-capped), REPL fills the height below. */
@media (orientation: portrait) {
#layout { flex-direction: column; }
#game-pane { width: 100vw; height: auto; }
canvas { width: 100vw; height: auto; max-width: none; max-height: 85vh; }
#repl-pane {
width: 100vw; height: auto; flex: 1 1 0; min-height: 0;
border-left: 0; border-top: 1px solid #313244;
}
}
#repl-head {
flex: 0 0 auto; padding: 6px 10px; font-size: 12px; color: #a6adc8;
background: #11111b; border-bottom: 1px solid #313244;
display: flex; justify-content: space-between; gap: 8px;
}
#repl-head .dot { color: #a6e3a1; }
#repl-head .dot.idle { color: #6c7086; }
#scrollback {
flex: 1 1 auto; min-height: 0; overflow: auto; padding: 8px 10px;
font-size: 13px; line-height: 1.4; white-space: pre-wrap; word-break: break-word;
}
#scrollback .line { padding: 1px 0; }
#scrollback .cmd { color: #89b4fa; }
#scrollback .result { color: #a6e3a1; }
#scrollback .error { color: #f38ba8; }
#scrollback .stdout { color: #cdd6f4; }
#scrollback .info { color: #6c7086; }
#input-row { flex: 0 0 auto; display: flex; align-items: stretch; border-top: 1px solid #313244; background: #11111b; }
#prompt {
flex: 0 0 auto; padding: 8px 10px; color: #f9e2af; user-select: none;
cursor: pointer; touch-action: none; -webkit-tap-highlight-color: transparent;
border-right: 1px solid #313244;
}
#prompt:active { color: #fab387; background: #1e1e2e; }
#input {
flex: 1 1 auto; min-width: 0; resize: none; border: 0; outline: 0;
background: transparent; color: #cdd6f4; padding: 8px 10px 8px 0;
font: inherit; font-size: 13px; line-height: 1.4;
height: 1.6em; max-height: 8em; overflow: auto;
}
#input::placeholder { color: #585b70; }
#status { color: #cdd6f4; font-family: sans-serif; position: fixed; top: 8px; left: 8px; }
</style>
</head>
<body>
<div id="layout">
<div id="game-pane">
<canvas id="canvas" oncontextmenu="event.preventDefault()" tabindex="-1"></canvas>
</div>
<div id="repl-pane">
<div id="repl-head">
<span><span id="repl-dot" class="dot idle">●</span> ruby repl <span style="color:#585b70">(Enter: eval · Shift+Enter: newline · ↑/↓: hist)</span></span>
<span id="repl-target">—</span>
</div>
<div id="scrollback"></div>
<div id="input-row">
<span id="prompt" role="button" aria-label="Autocomplete (Tab)" title="Autocomplete (Tab)">></span>
<textarea id="input" rows="1" spellcheck="false" autocapitalize="off" autocomplete="off" disabled placeholder="warming up…"></textarea>
</div>
</div>
</div>
<div id="status">loading…</div>
<script>
var statusEl = document.getElementById('status');
var canvas = document.getElementById('canvas');
var scrollback = document.getElementById('scrollback');
var input = document.getElementById('input');
var replDot = document.getElementById('repl-dot');
var replTarget = document.getElementById('repl-target');
var HISTORY_KEY = 'jamstack.repl.hist';
var hist = [];
var histIndex = 0;
try { hist = JSON.parse(localStorage.getItem(HISTORY_KEY) || '[]'); } catch (e) {}
histIndex = hist.length;
var draftOnHistory = '';
function appendLine(text, cls) {
var div = document.createElement('div');
div.className = 'line ' + (cls || 'stdout');
div.textContent = text;
scrollback.appendChild(div);
scrollback.scrollTop = scrollback.scrollHeight;
}
function appendInfo(t) { appendLine(t, 'info'); }
function ready() { return window.Module && typeof window.Module.jamstack === 'function'; }
function evalRuby(code) {
var raw;
try { raw = window.Module.jamstack(code); }
catch (e) { raw = JSON.stringify({ ok: false, error: 'jamstack threw: ' + String(e) }); }
var env;
try { env = JSON.parse(raw || '{}'); } catch (e) { env = { ok: false, error: 'bad json: ' + raw }; }
if (env.stdout) appendLine(env.stdout, 'stdout');
if (env.ok) {
var r = env.result;
if (r != null && r !== '' && r !== 'nil') appendLine('=> ' + r, 'result');
} else {
appendLine(env.error || '(no error message)', 'error');
if (env.backtrace && env.backtrace.length) appendLine(env.backtrace.slice(0, 6).join('\n'), 'error');
}
}
// Build a Ruby single-quoted string literal from `s`. Single-quoted Ruby
// strings do NOT interpolate `#{}`, so the text is passed verbatim to
// complete_json (only `\\` and `\'` need escaping). Avoids injection via
// Ruby string interpolation when the input contains `#`/`{}`.
function rubySingleQuote(s) {
return "'" + String(s).replace(/\\/g, '\\\\').replace(/'/g, "\\'") + "'";
}
// Tab completion via Jamstack::Bridge.complete_json (runs in the game's
// binding on the main thread). env.result is the Ruby-inspected JSON string
// (eval_code wraps every result with String#inspect), so we parse TWICE:
// first unwrap the inspect quoting -> the JSON string, then parse that into
// the completion object.
function completeRuby() {
var text = input.value;
if (text === '') return;
var raw;
try { raw = window.Module.jamstack('Jamstack::Bridge.complete_json(' + rubySingleQuote(text) + ')'); }
catch (e) { return; }
var env;
try { env = JSON.parse(raw || '{}'); } catch (e) { return; }
if (!env.ok) { if (env.error) appendLine(env.error, 'error'); return; }
var inner, comp;
try { inner = JSON.parse(env.result || '""'); }
catch (e) { return; }
try { comp = (typeof inner === 'string') ? JSON.parse(inner) : inner; }
catch (e) { return; }
if (!comp || !comp.candidates || comp.candidates.length === 0) return;
if (comp.single) {
input.value = comp.completed;
} else {
if (comp.completed != null) input.value = comp.completed;
var shown = comp.candidates.length > 40
? comp.candidates.slice(0, 40).concat(['…']) : comp.candidates;
appendLine(shown.join(' '), 'info');
}
autoSize();
input.selectionStart = input.selectionEnd = input.value.length;
}
function saveHistory() {
try { localStorage.setItem(HISTORY_KEY, JSON.stringify(hist.slice(-200))); } catch (e) {}
}
// Keyboard: Emscripten's GLFW port registers `window.addEventListener(
// 'keydown', GLFW.onKeydown, true)` (CAPTURE phase) at runtime init, and
// onKeydown calls event.preventDefault() for Backspace and Tab — which kills
// the textarea's native backspace-deletion and tab-insertion while the REPL
// is focused. It also forwards EVERY key to raylib, so typing `a` here would
// also steer the player. We register our OWN window-capture keydown listener
// FIRST (this inline script runs before the Emscripten glue inits), so we
// run before GLFW.onKeydown. When the REPL input is focused we
// stopImmediatePropagation() to fully isolate the REPL from the game.
// stopImmediatePropagation does NOT cancel default actions (only
// preventDefault does), so letter insertion and Backspace deletion still
// happen natively; we only preventDefault the keys we handle ourselves.
window.addEventListener('keydown', function (ev) {
if (document.activeElement !== input) return; // game owns the keyboard
ev.stopImmediatePropagation(); // keep Emscripten/raylib off the REPL
var k = ev.key;
if (k === 'Enter' && !ev.shiftKey) {
ev.preventDefault();
var code = input.value;
if (code.trim() === '') { input.value = ''; autoSize(); return; }
hist.push(code); histIndex = hist.length; saveHistory();
appendLine('> ' + code, 'cmd');
input.value = ''; autoSize();
evalRuby(code);
scrollback.scrollTop = scrollback.scrollHeight;
} else if (k === 'ArrowUp') {
ev.preventDefault();
if (histIndex === hist.length) draftOnHistory = input.value;
if (histIndex > 0) { histIndex--; input.value = hist[histIndex] || ''; autoSize(); }
} else if (k === 'ArrowDown') {
ev.preventDefault();
if (histIndex < hist.length) {
histIndex++;
input.value = (histIndex === hist.length) ? draftOnHistory : (hist[histIndex] || '');
autoSize();
}
} else if (k === 'Tab') {
ev.preventDefault();
completeRuby();
} else if (k === 'l' && ev.ctrlKey) {
ev.preventDefault();
scrollback.textContent = '';
}
// Letters, Backspace, Shift+Enter, Left/Right/Home/End: let the textarea
// perform its native default (insert/delete/move) — only Emscripten is
// suppressed via stopImmediatePropagation above.
}, true);
input.addEventListener('input', autoSize);
// Tap the `>` prompt to trigger Tab completion (mobile has no Tab key).
// preventDefault on touchstart/mousedown keeps focus on the textarea so the
// mobile soft keyboard stays open. Guard against double-fire on touch
// devices (touchstart then a synthetic mousedown).
var promptEl = document.getElementById('prompt');
var tabTouched = false;
function tapComplete(ev) {
ev.preventDefault();
ev.stopPropagation();
completeRuby();
input.focus();
}
promptEl.addEventListener('touchstart', function (ev) {
tabTouched = true;
tapComplete(ev);
}, { passive: false });
promptEl.addEventListener('mousedown', function (ev) {
if (tabTouched) { tabTouched = false; return; }
tapComplete(ev);
});
function autoSize() {
input.style.height = '1.6em';
input.style.height = Math.min(input.scrollHeight, 8 * 20) + 'px';
}
var Module = {
arguments: ['game/fx_demo.rb'],
canvas: canvas,
print: function (t) { console.log(t); },
printErr: function (t) { console.error(t); },
setStatus: function (t) { statusEl.textContent = t; if (!t) statusEl.style.display = 'none'; },
onRuntimeInitialized: function () {
Module.jamstack = function (code) {
return Module.ccall('jamstack_eval', 'string', ['string'], [code]);
};
Module.flecsRequest = function (method, path, body) {
return Module.ccall('flecs_explorer_request', 'string',
['string', 'string', 'string'], [method, path, body || '']);
};
input.disabled = false; input.placeholder = 'type Ruby, then Enter…';
replDot.classList.remove('idle');
replTarget.textContent = 'fx_demo.rb';
appendInfo('Jamstack HTML REPL ready — evals in the live game via jamstack_eval.');
appendInfo('Try: score player_x = 100 Rl.get_fps Rl.platform');
input.focus();
},
};
</script>
{{{ SCRIPT }}}
</body>
</html>
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