datakit/build/cli/omit.js

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

"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (g && (g = 0, op[0] && (_ = 0)), _) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.documentation = exports.main = exports.omit = void 0;
var io_1 = require("../lib/io");
var help_1 = require("./lib/help");
var utils_1 = require("../lib/utils");
//
// Omit fields from the input data.
//
function omit(fields, data) {
    var transformed = {};
    var fieldSet = new Set(fields);
    for (var _i = 0, _a = Object.entries(data); _i < _a.length; _i++) {
        var _b = _a[_i], field = _b[0], value = _b[1];
        if (!fieldSet.has(field)) {
            transformed[field] = value;
        }
    }
    return transformed;
}
exports.omit = omit;
function main(argv) {
    return __awaiter(this, void 0, void 0, function () {
        var fieldsArg, fields, data, transformed;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0:
                    if (argv.length < 1) {
                        throw new Error("Expected <fields> argument for the field names to pick from the input data.");
                    }
                    fieldsArg = argv.shift();
                    fields = fieldsArg.split(",").map(function (field) { return field.trim(); });
                    return [4 /*yield*/, (0, io_1.inputData)(argv)];
                case 1:
                    data = _a.sent();
                    if ((0, utils_1.isArray)(data)) {
                        transformed = data.map(function (record) { return omit(fields, record); });
                    }
                    else {
                        transformed = omit(fields, data);
                    }
                    return [4 /*yield*/, (0, io_1.outputData)(argv, transformed)];
                case 2:
                    _a.sent();
                    return [2 /*return*/];
            }
        });
    });
}
exports.main = main;
exports.documentation = {
    name: "omit",
    desc: "Creates a new dataset by omitting the specified fields from the input dataset.",
    syntax: "omit <fields> [<input-file>] [<output-file>]",
    inputs: help_1.standardCmdInputs,
    outputs: help_1.standardCmdOutputs,
    args: [
        {
            name: "fields",
            desc: "Comma-separated list of field names to omit from the input data",
        },
        help_1.standardInputFileHelp,
        help_1.standardOutputFileHelp,
    ],
    examples: [
        {
            name: "Reads JSON data from standard input, omits some fields and writes to standard output",
            cmd: 'command-that-produces-json | omit ColumnA,ColumnB,ColumnC',
        },
        {
            name: "Reads data from a file, omits some fields and writes to standard output",
            cmd: 'omit ColumnA,ColumnB,ColumnC input-file.csv',
        },
        {
            name: "Reads data from a file, omits some fields and writes output to another file",
            cmd: 'omit ColumnA,ColumnB,ColumnC input-file.csv output-file.csv'
        },
        {
            name: "Reads JSON data from standard input, omits some fields and writes output to another file",
            cmd: 'command-that-produces-json | omit ColumnA,ColumnB,ColumnC - output-file.csv'
        },
    ],
    seeAlso: [
        {
            cmd: "pick",
            desc: "The pick command is the opposite of the omit command.",
        },
    ],
    notes: [
        "The input data can be an array of objects or a single object.",
    ],
};
//# sourceMappingURL=omit.js.map