dbf2json

#!/usr/bin/env node

var fs = require("fs"),
    commander = require("commander"),
    shapefile = require("../");

commander
    .version(require("../package.json").version)
    .usage("[options] [file]")
    .description("Convert a dBASE file to JSON.")
    .option("-o, --out <file>", "output file name; defaults to “-” for stdout", "-")
    .option("-n, --newline-delimited", "output newline-delimited JSON")
    .option("--encoding <encoding>", "input character encoding")
    .parse(process.argv);

if (commander.args.length === 0) commander.args[0] = "-";
else if (commander.args.length !== 1) {
  console.error();
  console.error("  error: multiple input files");
  console.error();
  process.exit(1);
}

var out = (commander.out === "-" ? process.stdout : fs.createWriteStream(commander.out)).on("error", handleEpipe);

shapefile.openDbf(commander.args[0] === "-" ? process.stdin : commander.args[0], {encoding: commander.encoding})
  .then(commander.newlineDelimited ? writeNewlineDelimitedProperties : writeProperties)
  .catch(handleError);

function writeNewlineDelimitedProperties(source) {
  return source.read().then(function repeat(result) {
    if (result.done) return;
    out.write(JSON.stringify(result.value));
    out.write("\n");
    return source.read().then(repeat);
  }).then(function() {
    if (out !== process.stdout) out.end();
  });
}

function writeProperties(source) {
  out.write("[");
  return source.read().then(function(result) {
    if (result.done) return;
    out.write(JSON.stringify(result.value));
    return source.read().then(function repeat(result) {
      if (result.done) return;
      out.write(",");
      out.write(JSON.stringify(result.value));
      return source.read().then(repeat);
    });
  }).then(function() {
    out[out === process.stdout ? "write" : "end"]("]\n");
  });
}

function handleEpipe(error) {
  if (error.code === "EPIPE" || error.errno === "EPIPE") {
    process.exit(0);
  }
}

function handleError(error) {
  console.error();
  console.error("  error: " + error.message);
  console.error();
  process.exit(1);
}