kloudglue-alasql/bin/alasql-cli.js

Versatile SQL database for browser or node. Handles relational data and nested JSON (noSQL). Export to and import from Excel, localStorage or IndexedDB

#!/usr/bin/env node
 //
// Command line interface for Alasql
// Version: 0.2.2
// Date: 28.07.2015
// (c) 2014-2015, Andrey Gershun & M. Rangel Wulff
//

let alasql = require('alasql');
let path = require('path');
let fs = require('fs');
let stdin = process.openStdin();
let yargs = require('yargs')
	.strict()
	.usage('AlaSQL command-line utility (version ' + alasql.version + ')\n\nUsage: $0 [options] [sql] [params]')

.example('$0 "sql-statement"', 'Run SQL statement and output result as JSON')
	.example('')
	.example('$0 \'value of select 2+?\' 40', 'Outputs 42')
	.example('')
	.example('$0 \'select count(*) from txt()\' < city.txt', 'Count lines in city.txt')
	.example('')
	.example('$0 \'select * into xlsx("city.xlsx") from txt("city.txt")\'', 'Convert from txt to xlsx')
	.example('')
	.example('$0 --file file.sql France 1960', 'Run SQL from file with 2 parameters')

.version('v', 'Echo AlaSQL version', alasql.version)
	.alias('v', 'version')

.boolean('m')
	.describe('m', 'Minify json output')
	.alias('m', 'minify')

.describe('f', 'Load SQL from file')
	.alias('f', 'file')
	.nargs('f', 1)
	.normalize('f')

.help('h')
	.alias('h', 'help')

.epilog('\nMore information about the library: www.alasql.org')

let argv = yargs.argv;
let sql = '';
let params = [];
let pipedData = ''
stdin.on('data', function (chunk) {
	pipedData += chunk;
});

if (argv.v) {
	console.log(alasql.version);
	process.exit(0);
}

if (argv.f) {
	if (!fs.existsSync(argv.f)) {
		console.error('Error: file not found');
		process.exit(1);
	}

	if (isDirectory(argv.f)) {
		console.error('Error: file expected but directory found');
		process.exit(1);
	}

	sql = fs.readFileSync(argv.f, 'utf8').toString();
	execute(sql, argv._);

} else {
	sql = argv._.shift() || '';

	// if data is not piped
	if (Boolean(process.stdin.isTTY)) {
		execute(sql, argv._);
	}
}

// if data is piped
stdin.on('end', function () {
	execute(pipedData, argv._);
});

/**
 * Execute SQL query
 *
 * @sql {String} SQL query
 * @param {String} Parameters
 * @returns {null} Result will be printet to console.log
 */
function execute(sql, params) {

	if (0 === sql.trim().length) {
		console.error("\nNo SQL to process\n");
		yargs.showHelp();
		process.exit(1);
	}

	for (var i = 1; i < params.length; i++) {
		var a = params[i];
		if (a[0] !== '"' && a[0] !== "'") {
			if (+a == a) { // jshint ignore:line
				params[i] = +a;
			}
		}
	}

	alasql.promise(sql, params)
		.then(function (res) {
			if (!alasql.options.stdout) {
				console.log(formatOutput(res));
			}
			process.exit(0);
		}).catch(function (err) {
			let errorJsonObj = JSON.parse(JSON.stringify(err, Object.getOwnPropertyNames(err)));
			console.error(formatOutput({
				error: errorJsonObj
			}));
			process.exit(1);
		});
}

/**
 * Is this padh a Directory
 *
 * @param {String} filePath
 * @returns {Boolean}
 */
function isDirectory(filePath) {
	var isDir = false;
	try {
		var absolutePath = path.resolve(filePath);
		isDir = fs.lstatSync(absolutePath).isDirectory();
	} catch (e) {
		isDir = e.code === 'ENOENT';
	}
	return isDir;
}


/**
 * Format output
 *
 * @param {Object} Object to be formatted according to -p flag
 * @returns {JSON string}
 */
function formatOutput(obj) {
	if (argv.m) {
		return JSON.stringify(obj);
	}
	return JSON.stringify(obj, null, 2);
}