datakit/build/cli/group.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 user_fn_1 = require("./lib/user-fn");
var verify_1 = require("../lib/verify");
var help_1 = require("./lib/help");
function main(argv) {
    return __awaiter(this, void 0, void 0, function () {
        var keySelectorFn, data, groups, groupMap, _loop_1, _i, data_1, record;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    keySelectorFn = (0, user_fn_1.loadUserFn)(argv, "r => r.key");
                    return [4 /*yield*/, (0, io_1.inputData)(argv)];
                case 1:
                    data = _a.sent();
                    (0, verify_1.verifyInputArray)(data, "group");
                    groups = [];
                    groupMap = {};
                    _loop_1 = function (record) {
                        var key = (0, user_fn_1.invokeUserFn)(function () { return keySelectorFn.fn(record); }, keySelectorFn.details);
                        if (groupMap[key] === undefined) {
                            var group = {
                                key: key,
                                records: [],
                            };
                            groups.push(group);
                            groupMap[key] = group;
                        }
                        groupMap[key].records.push(record);
                    };
                    for (_i = 0, data_1 = data; _i < data_1.length; _i++) {
                        record = data_1[_i];
                        _loop_1(record);
                    }
                    return [4 /*yield*/, (0, io_1.outputData)(argv, groups)];
                case 2:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    });
}
exports.main = main;
exports.documentation = {
    name: "group",
    desc: "Organises records from an input dataset into groups based on a key.",
    syntax: "group <key-selector-fn> [<input-file>] [<output-file>]",
    inputs: help_1.standardCmdInputs,
    outputs: help_1.standardCmdOutputs,
    args: [
        help_1.standardInputFileHelp,
        {
            name: "key-selector-fn",
            desc: "A JavaScript function to select the grouping key for each record of the input dataset. Specifying a file name will load the JavaScript code from the file.",
        },
        help_1.standardOutputFileHelp,
    ],
    examples: [
        {
            name: "Reads JSON data from standard input, groups by \"department\" and writes the groups to standard output",
            cmd: 'command-that-produces-json | group "record => record.department"',
        },
        {
            name: "Reads data from a file, groups by \"department\" and writes the groups to standard output",
            cmd: 'group "record => record.department" input-file.csv',
        },
        {
            name: "Reads data from a file, groups by \"department\" and counts total sales, writing the output to a file",
            cmd: 'group input-file.csv "r => r.department" | map - "g => ({ department: g.key, totalSales: g.records.length })" output-file.csv',
        },
    ],
};
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