#!/usr/bin/env node

/**

* @license Apache-2.0

*

* Copyright (c) 2018 The Stdlib Authors.

*

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

*

* http://www.apache.org/licenses/LICENSE-2.0

*

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

*/

'use strict';

// MODULES //

var resolve = require( 'path' ).resolve;

var spawn = require( 'child_process' ).spawn;

var readFileSync = require( './../lib/node_modules/@stdlib/fs/read-file' ).sync;

var cwd = require( './../lib/node_modules/@stdlib/process/cwd' );

var ENV = require( './../lib/node_modules/@stdlib/process/env' );

var CLI = require( './../lib/node_modules/@stdlib/tools/cli' );

var COMMANDS = require( './commands.json' );

// FUNCTIONS //

/**

* Callback invoked upon encountering an error while running a command.

*

* @private

* @param {Error} error - error object

*/

function onError( error ) {

process.exitCode = 1;

console.error( 'Error: %s', error.message ); // eslint-disable-line no-console

}

/**

* Finds a command in the command list.

*

* @private

* @param {string} name - command name

* @returns {(Object|null)} command info

*/

function findCommand( name ) {

return COMMANDS[ name ] || null;

}

// MAIN //

/**

* Main execution sequence.

*

* @private

*/

function main() {

var subargs;

var args;

var opts;

var proc;

var cli;

var cmd;

var i;

// Create a command-line interface:

cli = new CLI({

'pkg': require( './../package.json' ),

'options': require( './opts.json' ),

'help': readFileSync( resolve( __dirname, 'usage.txt' ), {

'encoding': 'utf8'

})

});

// Get any provided command-line arguments:

args = cli.args();

// Extract the command:

if ( args[ 0 ] === 'help' ) {

if ( args[ 1 ] === void 0 ) {

return cli.help();

}

cmd = findCommand( args[ 1 ] );;

if ( cmd === null ) {

return onError( new Error( 'invalid argument. Unrecognized/unsupported command. Value: `' + args[ 1 ] + '`.' ) );

}

cmd = resolve( __dirname, '..', cmd.path );

subargs = [ cmd, '--help' ];

} else {

cmd = findCommand( args[ 0 ] );;

if ( cmd === null ) {

return onError( new Error( 'invalid argument. Unrecognized/unsupported command. Value: `' + args[ 0 ] + '`.' ) );

}

cmd = resolve( __dirname, '..', cmd.path );

subargs = [ cmd ];

for ( i = 1; i < args.length; i++ ) {

subargs.push( args[ i ] );

}

}

// Define sub-process options:

opts = {

'cwd': cwd(),

'env': ENV,

'stdio': 'inherit'

};

// Invoke the command in a sub-process:

proc = spawn( 'node', subargs, opts );

proc.on( 'error', onError );

}

main();