Rough start to Deno runtime implemenation

.editorconfig

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+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = tab
+insert_final_newline = false
+max_line_length = 120
+tab_width = 2

deno.jsonc

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+{
+	"imports": {
+		"std": "https://deno.land/std@0.204.0/",
+		// "/": "./src/",
+	},
+	"lint": {
+		"include": ["src/"],
+		"rules": {
+			"tags": ["recommended"],
+		}
+	},
+	"fmt": {
+		"useTabs": true,
+		"lineWidth": 80,
+		"indentWidth": 2,
+		"semiColons": true,
+		"singleQuote": true,
+	},
+	"nodeModulesDir": true,
+}

justfile

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+# Lists the available actions
+default:
+	@just --list
+
+# Code linting with deno
+deno-lint:
+	deno lint
+
+# Code linting with bun
+bun-lint:
+
+# Run with deno
+deno-run:
+	deno run --allow-all --allow-ffi --deny-net --deny-hrtime --unstable ./src/scroll.ts

src/bun/ffi.ts

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+// Bun-specific ffi code

src/deno/ffi.ts

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+// Deno-specific ffi code
+
+// Determine library extension based on
+// your OS.
+let libSuffix = '';
+switch (Deno.build.os) {
+	case 'windows':
+		libSuffix = 'dll';
+		break;
+	case 'darwin':
+		libSuffix = 'dylib';
+		break;
+	default:
+		libSuffix = 'so';
+		break;
+}
+
+const cSharedLib = `./libc.${libSuffix}`;
+const cStdLib = Deno.dlopen(
+	cSharedLib,
+	{
+	termios: {
+		type: {
+			struct: [
+				// c_iflag
+				'u32',
+				// c_oflag
+				'u32',
+				// c_cflag
+				'u32',
+				// c_lflag
+				'u32',
+				// c_cc[20]
+				'u8', 'u8', 'u8', 'u8', 'u8',
+				'u8', 'u8', 'u8', 'u8', 'u8',
+				'u8', 'u8', 'u8', 'u8', 'u8',
+				'u8', 'u8', 'u8', 'u8', 'u8',
+				// __ispeed
+				'i32',
+				// __ospeed
+				'i32',
+			]
+		}
+	},
+	tcgetattr: {
+		parameters: ['i32', 'pointer'],
+		result: 'i32',
+	},
+	tcsetattr: {
+		parameters: ['i32', 'i32', 'pointer'],
+		result: 'i32',
+	},
+	cfmakeraw: {
+		parameters: ['pointer'],
+		result: 'void',
+	},
+} as const,
+);
+
+export default cStdLib.symbols;
+export const termios = cStdLib.symbols.termios;
+export const tcgetattr = cStdLib.symbols.tcgetattr;
+export const tcsetattr = cStdLib.symbols.tcsetattr;
+export const cfmakeraw = cStdLib.symbols.cfmakeraw;

src/deno/index.ts

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+/**
+ * The main entrypoint when using Deno as the runtime
+ */
+export async function main(): Promise<number> {
+	const decoder = new TextDecoder();
+	for await (const chunk of Deno.stdin.readable) {
+		const char = String(decoder.decode(chunk)).trim();
+
+		if (char === 'q') {
+			return 0;
+		}
+	}
+
+	return -1;
+}

src/scroll.ts

@@ -1,6 +1,24 @@
 /**
  * The starting point for running scroll
  */
-(() => {
-	// Now, to do stuff 
+
+export enum RunTime {
+	Bun = 'bun',
+	Deno = 'deno',
+	Unknown = 'common',
+}
+
+/**
+ * Determine the runtime strategy, and go!
+ */
+(async () => {
+	let RUNTIME = RunTime.Unknown;
+	if ('Deno' in globalThis) {
+		RUNTIME = RunTime.Deno;
+		const { main } = await import('./deno/index.ts');
+		await main();
+	}
+	if ('Bun' in globalThis) {
+		RUNTIME = RunTime.Bun;
+	}
 })();