mcopy/src/system/index.ts

'use strict';

import { tmpdir, type } from 'os';
import { screen } from 'electron';
//private
import { exec } from 'exec';
/**
 * Evaluates system dependencies for digital
 * projector features by executing processes with
 * --help flag. If they do not exist, log to console
 * 
 * @param {string} platform  Operating system type
 **/

async function dependencies (platform : string )  {
	let obj : any = {};

	try {
		await exec('ffmpeg -h');
		obj.ffmpeg = 'ffmpeg';
	} catch (err) {
		//return exit('ffmpeg is not installed', 3);
		return console.error('ffmpeg is not installed', err);
	}

	try {
		await exec('convert -h');
		obj.convert = 'convert';
	} catch (err) {
		//return exit('ffmpeg is not installed', 3);
		return console.error('ffmpeg is not installed', err);
	}
	//if linux
	if (platform === 'nix') {
		try {
			await exec('eog -h');
			obj.eog = 'eog';
		} catch (err) {
			//return exit('eog is not installed', 4);
			return console.error('eog is not installed', err);
		}
	}

	return obj;
}

function displayMap (obj : any) {
	const sm : any = {
		width : obj.size.width,
		height : obj.size.height,
		x : obj.bounds.x,
		y : obj.bounds.y,
		scale : obj.scaleFactor,
		primary : (obj.bounds.x === 0 && obj.bounds.y === 0)
	};
	const primary : string = sm.primary ? ' (Primary)' : '' 
	sm.name = `${sm.width}x${sm.height}${primary}`;
	return sm;
}
function displaySort (a : any, b : any){
	if (a.primary) {
		return -1
	} else if (b.primary) {
		return 1
	}
	return 0
}

async function displays () {
	let displays : any[] = screen.getAllDisplays();
	displays = displays.map(displayMap);
	displays.sort(displaySort);
	return displays;
}

/**
 * Profile the current system and return an object with
 * data about the displays and dependencies for the digital
 * projector feature.
 *
 * @returns {object} Object containing system information
 */ 
async function system (ui : any) {
	const obj : any = {};
	let platform : string;

	try {
		obj.tmp = tmpdir();
	} catch (err) {
		obj.tmp = '/tmp'
	}

	platform = type();

	if (platform === 'Darwin') {
		obj.platform = 'osx';
	} else if (platform === 'Windows_NT') {
		obj.platform = 'win';
	} else {
		obj.platform = 'nix';
	}

	obj.displays = await displays()
	obj.deps = await dependencies(obj.platform);

	ui.send('system', obj);

	return obj;
}

module.exports = system;