gemstone-tool/src/gemstone-tool-cli.js

#!/usr/bin/env node
/*
**  GemstoneJS -- Gemstone JavaScript Technology Stack
**  Copyright (c) 2016-2018 Gemstone Project <http://gemstonejs.com>
**  Licensed under Apache License 2.0 <https://spdx.org/licenses/Apache-2.0>
*/

import chalk    from "chalk"
import dashdash from "dashdash"
import Gemstone from "../lib/gemstone-tool-api"
import pkg      from "../package.json"

/*
 *  STEP 1: Parse global options
 */

const options = [
    {   names: [ "help", "h" ], type: "bool", "default": false,
        help: "Print tool usage and exit." },
    {   names: [ "version" ], type: "bool", "default": false,
        help: "Print tool version and exit." },
    {   names: [ "verbose", "v" ], env: "GEMTOOL_VERBOSE", type: "bool", "default": false,
        help: "Enable verbosity in outputs." },
    {   names: [ "color", "c" ], env: "GEMTOOL_COLOR", type: "bool", "default": chalk.supportsColor,
        help: "Enable colors in outputs." },
    {   names: [ "plugins", "p" ], type: "string", "default": "",
        help: "Plugins to load.", helpArg: "NAME[,...]" }
]
const parser = dashdash.createParser({
    options:      options,
    interspersed: false
})
let opts
try {
    opts = parser.parse(process.argv)
}
catch (ex) {
    process.stderr.write(`gemstone: ERROR: ${ex.message}\n`)
    process.exit(1)
}

/*
 *  STEP 2: Execute global options
 */

if (opts.help) {
    let help = parser.help().trimRight()
    process.stdout.write(
        "gemstone: USAGE: gemstone [options] command [arguments]\n" +
        "options:\n" +
        help + "\n")
    process.exit(0)
}
else if (opts.version) {
    process.stdout.write(`${pkg.name} ${pkg.version}\n`)
    process.exit(0)
}

/*
 *  STEP 3: Load API and the requested plugins
 */

let gemstone = new Gemstone({
    verbose: opts.verbose,
    color:   opts.color
})
if (opts.plugins !== "") {
    let plugins = opts.plugins.split(/,/)
    gemstone.use(plugins)
}

/*
 *  STEP 4: Parse command-line arguments
 */

let args = opts._args

if (args.length === 0)
    args = [ "help" ]

let pluginName = args.shift()
let pluginOpts = {}
let pluginArgs = []

const convertValue = (val) => {
    if (val.match(/^(?:true|false)$/))
        val = (val === "true")
    else if (val.match(/^[+-]?[0-9]+$/))
        val = parseInt(val, 10)
    else if (val.match(/^[+-]?[0-9]*\.?[0-9]+(?:[eE][+-]?[0-9]+)?$/))
        val = parseFloat(val)
    return val
}

while (args.length > 0) {
    let arg = args.shift()
    let m
    if ((m = arg.match(/^([a-zA-Z_][a-zA-Z0-9_-]*)=(.*)$/)) !== null) {
        let [ , key, val ] = m
        if (val.match(/[^\\],/)) {
            val = val
                .replace(/\\,/g, "\uE000")
                .split(/,/)
                .map((val) => convertValue(val.replace(/\uE000/g, ",")))
        }
        else
            val = convertValue(val.replace(/\\,/g, ","))
        pluginOpts[key] = val
    }
    else
        pluginArgs.push(convertValue(arg))
}

/*
 *  STEP 5: Pass-through execution to Gemstone API
 */

gemstone.exec(pluginName, pluginOpts, ...pluginArgs).then((output) => {
    process.stdout.write(output)
    process.exit(0)
}).catch((err) => {
    process.stderr.write(`gemstone: ERROR: ${err.stack}\n`)
    process.exit(1)
})