Add support for exit codes.

Readme.md

@@ -95,7 +95,7 @@ program
   .option('-s --size <size>', 'Pizza size', /^(large|medium|small)$/i, 'medium')
   .option('-d --drink [drink]', 'Drink', /^(coke|pepsi|izze)$/i)
   .parse(process.argv);
-  
+
 console.log(' size: %j', program.size);
 console.log(' drink: %j', program.drink);
 ```
@@ -298,6 +298,10 @@ function make_red(txt) {
   Output help information and exit immediately.
   Optional callback cb allows post-processing of help text before it is displayed.
 
+## .exitCode(code)
+
+  Set the exit code for option parsing errors.  Defaults to `64`.
+
 ## Examples
 
 ```js
@@ -348,4 +352,3 @@ More Demos can be found in the [examples](https://github.com/tj/commander.js/tre
 ## License
 
 MIT
-

index.js

@@ -87,6 +87,7 @@ function Command(name) {
   this._allowUnknownOption = false;
   this._args = [];
   this._name = name || '';
+  this._code = 64;
 }
 
 /**
@@ -266,7 +267,7 @@ Command.prototype.action = function(fn) {
     var parsed = self.parseOptions(unknown);
 
     // Output help if necessary
-    outputHelpIfNecessary(self, parsed.unknown);
+    outputHelpIfNecessary(self, parsed.unknown, this._code);
 
     // If there are still any unknown options, then we simply
     // die, unless someone asked for help, in which case we give it
@@ -617,7 +618,7 @@ Command.prototype.parseArgs = function(args, unknown) {
       this.emit('*', args);
     }
   } else {
-    outputHelpIfNecessary(this, unknown);
+    outputHelpIfNecessary(this, unknown, this._code);
 
     // If there were no args and we have unknown options,
     // then they are extraneous and we need to error.
@@ -752,7 +753,7 @@ Command.prototype.missingArgument = function(name) {
   console.error();
   console.error("  error: missing required argument `%s'", name);
   console.error();
-  process.exit(1);
+  process.exit(this._code);
 };
 
 /**
@@ -771,7 +772,7 @@ Command.prototype.optionMissingArgument = function(option, flag) {
     console.error("  error: option `%s' argument missing", option.flags);
   }
   console.error();
-  process.exit(1);
+  process.exit(this._code);
 };
 
 /**
@@ -786,7 +787,7 @@ Command.prototype.unknownOption = function(flag) {
   console.error();
   console.error("  error: unknown option `%s'", flag);
   console.error();
-  process.exit(1);
+  process.exit(this._code);
 };
 
 /**
@@ -827,6 +828,20 @@ Command.prototype.version = function(str, flags) {
   return this;
 };
 
+/**
+ * Set the exit code used for option parsing problems.
+ *
+ * @param {Integer} code
+ * @return {Command} for chaining
+ * @api public
+ */
+
+Command.prototype.exitCode = function(code) {
+  if (0 == arguments.length) return this._code;
+  this._code = code;
+  return this;
+};
+
 /**
  * Set the description to `str`.
  *
@@ -1031,7 +1046,7 @@ Command.prototype.outputHelp = function(cb) {
 
 Command.prototype.help = function(cb) {
   this.outputHelp(cb);
-  process.exit();
+  process.exit(this._code);
 };
 
 /**
@@ -1070,12 +1085,12 @@ function pad(str, width) {
  * @api private
  */
 
-function outputHelpIfNecessary(cmd, options) {
+function outputHelpIfNecessary(cmd, options, code) {
   options = options || [];
   for (var i = 0; i < options.length; i++) {
     if (options[i] == '--help' || options[i] == '-h') {
       cmd.outputHelp();
-      process.exit(0);
+      process.exit(code);
     }
   }
 }
@@ -1106,4 +1121,3 @@ function exists(file) {
     return false;
   }
 }
-

test/test.codes.help.js

@@ -0,0 +1,18 @@
+/**
+ * Module dependencies.
+ */
+
+var util = require('util')
+  , program = require('../')
+  , should = require('should');
+
+process.on('exit', function (code) {
+  code.should.equal(66);
+  process.exit(0)
+});
+
+program
+  .exitCode(66)
+  .option('-c, --cheese <type>', 'optionally specify the type of cheese');
+
+program.parse(['node', 'test', '-h']);

test/test.codes.unknown.js

@@ -0,0 +1,18 @@
+/**
+ * Module dependencies.
+ */
+
+var util = require('util')
+  , program = require('../')
+  , should = require('should');
+
+process.on('exit', function (code) {
+  code.should.equal(65);
+  process.exit(0)
+});
+
+program
+  .exitCode(65)
+  .option('-c, --cheese <type>', 'optionally specify the type of cheese');
+
+program.parse(['node', 'test', '-g']);

test/test.codes.variadic.js

@@ -0,0 +1,18 @@
+/**
+ * Module dependencies.
+ */
+
+var util = require('util')
+  , program = require('../')
+  , should = require('should');
+
+process.on('exit', function (code) {
+  code.should.equal(1);
+  process.exit(0)
+});
+
+program
+  .exitCode(65)
+  .arguments('<cmd...> [env]')
+  .action(function(cmd, env){});
+program.parse(['node', 'test', 'foo']);

test/test.command.nohelp.js

@@ -2,6 +2,11 @@ var program = require('../')
 	, sinon = require('sinon').sandbox.create()
   , should = require('should');
 
+process.on('exit', function (code) {
+  code.should.equal(64);
+  process.exit(0)
+});
+
 program.command('mycommand [options]', 'this is my command');
 
 program

test/test.options.args.required.js

@@ -13,7 +13,7 @@ console.error = function () {
 };
 
 process.on('exit', function (code) {
-  code.should.equal(1);
+  code.should.equal(64);
   info.length.should.equal(3);
   info[1].should.equal("  error: option `-c, --cheese <type>' argument missing");
   process.exit(0)