datakit/build/cli/concat.js

Simple JavaScript toolkit for data transform across JSON, CSV and YAML.

"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
exports.documentation = exports.main = void 0;
var io_1 = require("../lib/io");
var verify_1 = require("../lib/verify");
var help_1 = require("./lib/help");
function main(argv) {
    return __awaiter(this, void 0, void 0, function () {
        var datasets, data, concatenated;
        var _a;
        return __generator(this, function (_b) {
            switch (_b.label) {
                case 0:
                    if (argv.length === 0) {
                        throw new Error("At least one input file must be specified");
                    }
                    datasets = [];
                    _b.label = 1;
                case 1:
                    if (!(argv.length > 0)) return [3 /*break*/, 3];
                    return [4 /*yield*/, (0, io_1.inputData)(argv)];
                case 2:
                    data = _b.sent();
                    (0, verify_1.verifyInputArray)(data, "concat");
                    datasets.push(data);
                    return [3 /*break*/, 1];
                case 3:
                    concatenated = (_a = datasets[0]).concat.apply(_a, datasets.slice(1));
                    (0, io_1.outputDataToStdout)(concatenated);
                    return [2 /*return*/];
            }
        });
    });
}
exports.main = main;
exports.documentation = {
    name: "concat",
    desc: "Creates an output dataset by concatenating multiple input datasets. Works like `array.concat` in JavaScript.",
    syntax: "concat ...<input-file>",
    inputs: help_1.standardCmdInputs,
    outputs: ["JSON formatted data on standard output"],
    args: [
        {
            name: "...input-file",
            desc: "One or more input file names (json, csv or yaml) or a hypen to indicate reading JSON data from standard input.",
        },
    ],
    examples: [
        {
            name: "Concatenates the data from multiple files and writes the result to standard output",
            cmd: 'concat input-file1.json input-file2.json input-file3.json',
        },
        {
            name: "Reads JSON data from standard input concatenates it with a file and writes the result to standard output",
            cmd: 'command-that-produces-json | concat - input-file.json',
        },
        {
            name: "Concatenates the data from multiple files and writes the result to a file",
            cmd: 'concat input-file1.json input-file2.json input-file3.json > output-file.json',
        },
    ],
    notes: [
        "This command (unlike most others in Datakit) isn't able to output directly to a file. Use redirection to write a file, shown in the example above.",
    ],
};
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