Allow config.json location to be configured by argument to app.js

README.md

@@ -73,6 +73,15 @@ npm start (*nix, Mac OSX)
 npm run-script startwin (Windows)
 ```
 
+**Start I/O Docs with a custom config file**:
+
+```
+./node_modules/.bin/supervisor -e 'js|json' -- app --config-file ../config.json (*nix, Mac OSX)
+supervisor -e 'js' -- app --config-file ../config.json (Windows)
+```
+
+Ideally, the `--config-file` arg would be possible to use with `npm start`, but until
+[npm issue #3494](https://github.com/isaacs/npm/issues/3494) is resolved, this is not supported.
 
 **Point your browser** to: [localhost:3000](http://localhost:3000)
 

app.js

@@ -38,11 +38,26 @@ var express     = require('express'),
     redis       = require('redis'),
     RedisStore  = require('connect-redis')(express);
 
+// Parse arguments
+var optimist = require('optimist')
+        .usage('Usage: $0 --config-file [file]')
+        .alias('c', 'config-file')
+        .alias('h', 'help')
+        .describe('c', 'Specify the config file location')
+        .default('c', './config.json');
+var argv = optimist.argv;
+
+if (argv.help) {
+    optimist.showHelp();
+    process.exit(0);
+}
+
 // Configuration
+var configFilePath = path.resolve(argv['config-file']);
 try {
-    var config = require('./config.json');
+    var config = require(configFilePath);
 } catch(e) {
-    console.error("File config.json not found or is invalid.  Try: `cp config.json.sample config.json`");
+    console.error("File " + configFilePath + " not found or is invalid.  Try: `cp config.json.sample config.json`");
     process.exit(1);
 }
 

package.json

@@ -29,7 +29,8 @@
     "oauth": "0.9.10",
     "redis": "0.8.3",
     "querystring": "0.1.0",
-    "supervisor": ">= 0.5.x"
+    "supervisor": ">= 0.5.x",
+    "optimist": ">= 0.6.0"
   },
   "devDependencies": {},
   "main": "index",