exec-limiter-cli/bin/exec-limiter-cli.js

Run multiple shell commands in parallel, but with a limit.

#!/usr/bin/env node

"use strict";

var Tilda = require("tilda"),
    ExecLimiter = require("exec-limiter"),
    readFile = require("read-utf8");

var parser = new Tilda(__dirname + "/../package.json", {
    options: [{
        name: "max",
        opts: ["m", "max"],
        desc: "The number of how many parallel processes you want to run.",
        required: true,
        type: Number
    }],
    args: [{
        name: "input",
        desc: "The input file."
    }],
    examples: ["exec-limiter -m 3 commands.txt"]
}).main(function (action) {
    readFile(action.args.input, function (err, content) {
        if (err) {
            return parser.exit(err);
        }

        content = content.split("\n").map(function (c) {
            return c.trim();
        }).filter(function (c) {
            return c && !c.startsWith("#");
        });

        var ex = new ExecLimiter(action.options.max.value);
        content.forEach(function (c, index) {
            console.log("Scheduling the \"" + c + "\" command.");
            ex.add(c, {
                stdio: "inherit"
            }, function (err, data) {
                console.log("Finished task from line " + (index + 1) + " / " + content.length);
            });
        });
    });
});