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#!/usr/bin/env node
var fs = require("fs"),
commander = require("commander"),
topojson = require("../");
commander
.version(require("../package.json").version)
.usage("[options] <n> [file]")
.description("Quantizes TopoJSON.")
.option("-o, --out <file>", "output topology file name; defaults to “-” for stdout", "-")
.parse(process.argv);
if (commander.args.length < 1) {
console.error();
console.error(" error: missing quantization parameter n");
console.error();
process.exit(1);
} else if (commander.args.length > 2) {
console.error();
console.error(" error: multiple input files");
console.error();
process.exit(1);
} else if (commander.args.length === 1) {
commander.args.push("-");
}
if (!(Math.floor(commander.args[0]) >= 2)) {
console.error();
console.error(" error: invalid quantization parameter " + commander.args[0]);
console.error();
process.exit(1);
}
read(commander.args[1]).then(quantize).then(write(commander.out)).catch(abort);
function read(file) {
return new Promise(function(resolve, reject) {
var data = [], stream = file === "-" ? process.stdin : fs.createReadStream(file);
stream
.on("data", function(d) { data.push(d); })
.on("end", function() { resolve(JSON.parse(Buffer.concat(data))); })
.on("error", reject);
});
}
function quantize(topology) {
return topojson.quantize(topology, +commander.args[0]);
}
function write(file) {
var stream = (file === "-" ? process.stdout : fs.createWriteStream(file)).on("error", handleEpipe);
return function(topology) {
return new Promise(function(resolve, reject) {
stream.on("error", reject)[stream === process.stdout ? "write" : "end"](JSON.stringify(topology) + "\n", function(error) {
if (error) reject(error);
else resolve();
});
});
};
}
function handleEpipe(error) {
if (error.code === "EPIPE" || error.errno === "EPIPE") {
process.exit(0);
}
}
function abort(error) {
console.error();
console.error(" error: " + error.message);
console.error();
process.exit(1);
}