Split 'Command' & 'Help' (#1)

index.js

@@ -1,10 +1,32 @@
 const { Argument } = require('./src/argument');
-const { Command, Help } = require('./src/command');
+const { Command: BaseCommand } = require('./src/command');
 const { CommanderError, InvalidOptionArgumentError } = require('./src/errors');
 const { Option } = require('./src/option');
+const { Help } = require('./src/help');
 
 // @ts-check
 
+class Command extends BaseCommand {
+  /**
+   * @inheritdoc
+   */
+
+  createCommand(...args) {
+    return new Command(...args);
+  };
+
+  /**
+   * You can customise the help with a subclass of Help by overriding createHelp,
+   * or by overriding Help properties using configureHelp().
+   *
+   * @return {Help}
+   */
+
+  createHelp() {
+    return Object.assign(new Help(), this.configureHelp());
+  };
+}
+
 /**
  * Expose the root command.
  */

src/argument.js

@@ -46,4 +46,21 @@ class Argument {
   };
 }
 
+/**
+ * Takes an argument and returns its human readable equivalent for help usage.
+ *
+ * @param {Argument} arg
+ * @return {string}
+ * @api private
+ */
+
+function humanReadableArgName(arg) {
+  const nameOutput = arg.name() + (arg.variadic === true ? '...' : '');
+
+  return arg.required
+    ? '<' + nameOutput + '>'
+    : '[' + nameOutput + ']';
+}
+
 module.exports.Argument = Argument;
+module.exports.humanReadableArgName = humanReadableArgName;