datakit
Version:
Simple JavaScript toolkit for data transform across JSON, CSV and YAML.
114 lines • 5.34 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; }
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 = void 0;
var io_1 = require("../lib/io");
var verify_1 = require("../lib/verify");
var help_1 = require("./lib/help");
//
// Create batches from an array.
//
function createBatches(array, batchSize) {
var batches = [];
for (var i = 0; i < array.length; i += batchSize) {
batches.push(array.slice(i, i + batchSize));
}
return batches;
}
function main(argv) {
return __awaiter(this, void 0, void 0, function () {
var batchSize, data, output;
return __generator(this, function (_a) {
switch (_a.label) {
case 0:
if (argv.length < 1) {
throw new Error("Expected <number> argument for for batch size.");
}
batchSize = parseInt(argv.shift());
return [4 /*yield*/, (0, io_1.inputData)(argv)];
case 1:
data = _a.sent();
(0, verify_1.verifyInputArray)(data, "batch");
output = createBatches(data, batchSize);
return [4 /*yield*/, (0, io_1.outputData)(argv, output)];
case 2:
_a.sent();
return [2 /*return*/];
}
});
});
}
exports.main = main;
exports.documentation = {
name: "batch",
desc: "Outputs the input dataset as an array of arrays, each sub-array containing the specified number of records.",
syntax: "batch <batch-size> [<input-file>] [<output-file>]",
inputs: help_1.standardCmdInputs,
outputs: [
"JSON file",
"YAML file",
"JSON formatted data on standard output.",
],
args: [
{
name: "batch-size",
desc: "Specifies the size for each batch.",
},
help_1.standardInputFileHelp,
help_1.standardOutputFileHelp,
],
examples: [
{
name: "Reads JSON data from standard input, batches the records into groups of 5 and writes to standard output",
cmd: 'command-that-produces-json | batch 5',
},
{
name: "Reads data from a file, batches the records into groups of 5 and writes to standard output",
cmd: 'batch 5 input-file.csv',
},
{
name: "Reads data from a file, batches the records into groups of 5 and writes output to another file",
cmd: 'batch 5 input-file.csv output-file.csv'
},
{
name: "Reads JSON data from standard input, applies the transformation and writes output to another file",
cmd: 'command-that-produces-json | batch 5 - output-file.csv'
},
],
};
//# sourceMappingURL=batch.js.map