scroll/src/bun/ffi.ts

// Bun-specific ffi code
import { dlopen, ptr, FFIType, suffix, toArrayBuffer } from "bun:ffi";
import {STDIN_FILENO, TCSANOW} from "../common/ffi";

const termiosArray = new Uint8Array(60);

const getLib = (name: string) => {
	return dlopen(
		name,
		{
			tcgetattr: {
				args: ['i32', 'pointer'],
				returns: 'i32',
			},
			tcsetattr: {
				args: ['i32', 'i32', 'pointer'],
				returns: 'i32',
			},
			cfmakeraw: {
				args: ['pointer'],
				returns: 'void',
			},
		},
	);
}

let cStdLib = {symbols: {}};

try {
	cStdLib = getLib(`libc.${suffix}`);
} catch {
	cStdLib = getLib(`libc.${suffix}.6`);
}

export const enableRawMode = () => {
	// Get the current termios settings
	const termiosPtr = ptr(termiosArray);
	cStdLib.symbols.tcgetattr(STDIN_FILENO, termiosPtr);

	const oldTermios = new Uint8Array(toArrayBuffer(termiosPtr, 0, 60), 0, 60);
	console.info(oldTermios);

	// Update termios struct with raw settings
	cStdLib.symbols.cfmakeraw(termiosPtr);

	// Actually set the new termios settings
	cStdLib.symbols.tcsetattr(STDIN_FILENO, TCSANOW, termiosPtr);

	return () => {
		const oldTermiosPtr = ptr(oldTermios);

		cStdLib.symbols.tcsetattr(STDIN_FILENO, TCSANOW, oldTermiosPtr);
	}
}