datakit
Version:
Simple JavaScript toolkit for data transform across JSON, CSV and YAML.
126 lines • 5.87 kB
JavaScript
;
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; }
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_.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.pick = void 0;
var io_1 = require("../lib/io");
var help_1 = require("./lib/help");
var utils_1 = require("../lib/utils");
//
// Pick fields from the input data.
//
function pick(fields, data) {
var transformed = {};
for (var _i = 0, fields_1 = fields; _i < fields_1.length; _i++) {
var field = fields_1[_i];
transformed[field] = data[field];
}
return transformed;
}
exports.pick = pick;
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 pick(fields, record); });
}
else {
transformed = pick(fields, data);
}
return [4 /*yield*/, (0, io_1.outputData)(argv, transformed)];
case 2:
_a.sent();
return [2 /*return*/];
}
});
});
}
exports.main = main;
exports.documentation = {
name: "pick",
desc: "Creates a new dataset by picking the specified fields from the input dataset.",
syntax: "pick <fields> [<input-file>] [<output-file>]",
inputs: help_1.standardCmdInputs,
outputs: help_1.standardCmdOutputs,
args: [
{
name: "fields",
desc: "Comma-separated list of field names to pick from the input data",
},
help_1.standardInputFileHelp,
help_1.standardOutputFileHelp,
],
examples: [
{
name: "Reads JSON data from standard input, picks some fields and writes to standard output",
cmd: 'command-that-produces-json | pick ColumnA,ColumnB,ColumnC',
},
{
name: "Reads data from a file, picks some fields and writes to standard output",
cmd: 'pick ColumnA,ColumnB,ColumnC input-file.csv',
},
{
name: "Reads data from a file, picks some fields and writes output to another file",
cmd: 'pick ColumnA,ColumnB,ColumnC input-file.csv output-file.csv'
},
{
name: "Reads JSON data from standard input, picks some fields and writes output to another file",
cmd: 'command-that-produces-json | pick ColumnA,ColumnB,ColumnC - output-file.csv'
},
],
seeAlso: [
{
cmd: "omit",
desc: "The omit command is the opposite of the pick command.",
},
],
notes: [
"The input data can be an array of objects or a single object.",
],
};
//# sourceMappingURL=pick.js.map