Replace node-getopt with commander for args

node-getopt isn't maintained and nodejs has started complaining about
deprecated features in it.

package.json

@@ -56,7 +56,6 @@
     "karma-safari-launcher": "latest",
     "karma-script-launcher": "latest",
     "mocha": "latest",
-    "node-getopt": "latest",
     "po2json": "latest",
     "sinon": "latest",
     "sinon-chai": "latest"

po/po2js

@@ -17,20 +17,16 @@
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-const getopt = require('node-getopt');
+const { program } = require('commander');
 const fs = require('fs');
 const po2json = require("po2json");
 
-const opt = getopt.create([
-    ['h', 'help', 'display this help'],
-]).bindHelp().parseSystem();
+program
+    .argument('<input>')
+    .argument('<output>')
+    .parse(process.argv);
 
-if (opt.argv.length != 2) {
-    console.error("Incorrect number of arguments given");
-    process.exit(1);
-}
-
-const data = po2json.parseFileSync(opt.argv[0]);
+const data = po2json.parseFileSync(program.args[0]);
 
 const bodyPart = Object.keys(data)
     .filter(msgid => msgid !== "")
@@ -42,4 +38,4 @@ const bodyPart = Object.keys(data)
 
 const output = "{\n" + bodyPart + "\n}";
 
-fs.writeFileSync(opt.argv[1], output);
+fs.writeFileSync(program.args[1], output);

po/xgettext-html

@@ -5,14 +5,14 @@
  * Licensed under MPL 2.0 (see LICENSE.txt)
  */
 
-const getopt = require('node-getopt');
+const { program } = require('commander');
 const jsdom = require("jsdom");
 const fs = require("fs");
 
-const opt = getopt.create([
-    ['o', 'output=FILE', 'write output to specified file'],
-    ['h', 'help', 'display this help'],
-]).bindHelp().parseSystem();
+program
+    .argument('<INPUT...>')
+    .requiredOption('-o, --output <FILE>', 'write output to specified file')
+    .parse(process.argv);
 
 const strings = {};
 
@@ -87,8 +87,8 @@ function process(elem, locator, enabled) {
     }
 }
 
-for (let i = 0; i < opt.argv.length; i++) {
-    const fn = opt.argv[i];
+for (let i = 0; i < program.args.length; i++) {
+    const fn = program.args[i];
     const file = fs.readFileSync(fn, "utf8");
     const dom = new jsdom.JSDOM(file, { includeNodeLocations: true });
     const body = dom.window.document.body;
@@ -116,4 +116,4 @@ for (let str in strings) {
     output += "\n";
 }
 
-fs.writeFileSync(opt.options.output, output);
+fs.writeFileSync(program.opts().output, output);