* Added verbose messages

* Updated docs
V 0.1.4

README.md

@@ -38,43 +38,68 @@ hari@hari-VirtualBox:~app$ node xyz.js
 
 ```
 
-#### Override using NODE_ENV
-values from config/production overides the default one
+#### Read additional config based on NODE_ENV variable.
+If we specify NODE_ENV=xyz then, config/xyz.js will overide the values from default.js. **Overriding is a deep merge**
 
 ```bash
 hari@hari-VirtualBox:~app$ env NODE_ENV=production node xyz.js 
-{ port: 5000 }
+{ port: 4000 }
 ```
 
-#### Override using Environtment Variables.
-Default prefix is `TC_`
+#### Set any configuration variable using Environtment variable.
+By setting an Environtment variable '<Prefix><key>=<value>', we can set config[key] as value.
+
+** First we will try to parse value as json. It it is failed value will be treated as string **
+
+** If a values if parsable as JSON object, then it will be deep merged with default configuration  **
+Default prefix is `TC_` ( Can be changed by setting  TC_PREFIX` env variable `)
+For eg:
+
+  * `TC_port` will set config.port
+  * `TC_a.b.c` will set config.a.b.c
+  * `TC_a='{"a":{"b":{"c": 123546 }}}'` will also set `config.a.b.c`
+  * `TC_port=8000` will set `{ port: 8000 }` By default, number will parsed as json number.
+  * `TC_port='"8000"'` will set `{ port: '8000' }` ( **now port is a string** because double quoted value will be parsed as string in json )
 
-TC_port will set config.port
 
-TC_a.b.c will set config.a.b.c
 ```bash
 hari@hari-VirtualBox:~app$ env NODE_ENV=production TC_db.mysql.user=root node xyz.js 
-{ port: 5000, db: { mysql: { user: 'root' } } }
+{ port: 4000, db: { mysql: { user: 'root' } } }
 ```
 
-#### Override using Environtment Variables. Custom Prefix
-Prefix can be changed using Environtment variable
+##### Use custom env prefix.
+
+default prefix can be changed using Environtment variable by setting `TC_PREFIX` Environtment variable
+
 ```bash
 export TC_PREFIX=MYAPP_
-export MYAPP_PORT=8080
+export MYAPP_port=8080
 hari@hari-VirtualBox:~app$ env MYAPP_db.mysql.user=root node xyz.js 
 { port: 8080, db: { mysql: { user: 'root' } } }
 
 ```
 
 #### use custom config directory
-config directory can be changed using Environtment variable
+config directory can be changed using Environtment variable by setting `CONFIG_DIR` Environtment variable
 ```bash
 hari@hari-VirtualBox:~app$ env CONFIG_DIR=../config TC_PREFIX=MYAPP_ NODE_ENV=production MYAPP_db.mysql.user=root node xyz.js 
 { dir: '../config', db: { mysql: { user: 'root' } } }
 
 ```
 
+#### printing debug messages
+set `DEBUG` environment variable to `tconfig`
+```bash
+export DEBUG=tconfig
+# OR
+export DEBUG='*'
+```
+
+#### Config directory search path
+  * Directory pointed by `CONFIG_DIR` environment variable
+  * < directory or main script >/config
+  * < current working directory >/config
+
 
 
 

example/app/config/default.json

@@ -1,3 +1,7 @@
 {
-	"port":3000
+	"port":3000,
+  "pool":{
+    "min":2,
+    "max":10
+  }
 }

example/app/xyz.js

@@ -1,2 +1,2 @@
 
-console.log( require('tconfig'));
+console.log( require('../../'));

index.js

@@ -7,9 +7,14 @@ var envPrefix = process.env.TC_PREFIX || 'TC_';
 var envRegex = new RegExp( '^' + envPrefix + '(.*)' );
 var finalConfig = {};
 var configDirLookupPath = [
-  path.resolve( path.join( require.main.paths[0], '..', 'config' ) ),
   path.join( process.env.PWD, 'config' )
 ];
+var beVerbose = process.env.DEBUG && 'tconfig'.match( process.env.DEBUG.replace( /\*/g, '.*' ) );
+var log = beVerbose ? console.log.bind( console, 'tconfig:: ' ) : function(){};
+
+if( require.main ){
+  configDirLookupPath.unshift( path.resolve( path.join( require.main.paths[0], '..', 'config' ) ) );
+}
 if( process.env.CONFIG_DIR ){
   configDirLookupPath.unshift( process.env.CONFIG_DIR );
 }
@@ -18,6 +23,7 @@ for (var i = 0, l = configDirLookupPath.length; i < l; i ++) {
   var v = configDirLookupPath[i];
   if( fs.existsSync(v) ){
     configDir = v;
+    log( 'Found config dir: ' + configDir );
     break;
   }
 }
@@ -28,18 +34,47 @@ if( !configDir ){
     '\n Please set CONFIG_DIR env variable');
 }
 
-
+function processSpecial( str ){
+  var out;
+  try {
+    out = JSON.parse(str);
+  } catch (e) {
+    out = str;
+  }
+  return out;
+}
 
 function loadConfig( name ){
+  log('Loading config ' + name );
   var out = {};
   try{
     out = require( configDir + '/' + name );
   } catch(e){
+    log( 'Error loading config ' + name, e );
     out = {};
   }
   return out;
 }
 
+function assignDeep( src, dest1, dest2 ){
+  var key, val;
+  for( key in dest1 ){
+    val = dest1[ key ];
+    if( val.constructor.name === 'Object' ){
+      if( ( !src.hasOwnProperty(key) ) || ( src[ key ].constructor.name !== 'Object' ) ){
+        src[ key ] = {};
+      }
+      assignDeep( src[ key ], val );
+    } else {
+      src[ key ] = val;
+    }
+  }
+  if( dest2 ){
+    assignDeep( src, dest2 );
+  }
+  return src;
+}
+
 /* Implementation of lodash.set function */
 function setProp( object, keys, val ){
   keys = Array.isArray( keys )? keys : keys.split('.');
@@ -47,17 +82,21 @@ function setProp( object, keys, val ){
     object[keys[0]] = object[keys[0]] || {};
     return setProp( object[keys[0]], keys.slice(1), val );
   }
+  if( val instanceof Object ){
+    return assignDeep( object[keys[0]], val );
+  }
   object[keys[0]] = val;
 }
 
-Object.assign( finalConfig, loadConfig('default'), loadConfig( env ) );
+assignDeep( finalConfig, loadConfig('default'), loadConfig( env ) );
 
-var envList = Object.keys( process.env ).filter( function(v){
+Object.keys( process.env ).filter( function(v){
   var match = v.match( envRegex );
   if( match ){
-    setProp( finalConfig, match[1].toLowerCase(), process.env[v] );
+    setProp( finalConfig, match[1], processSpecial( process.env[v] ) );
   }
 });
 
+log('Final config ', JSON.stringify(finalConfig, null, 2 ) );
 
 module.exports = finalConfig;

package.json

@@ -1,6 +1,6 @@
 {
   "name": "tconfig",
-  "version": "0.1.1",
+  "version": "0.1.4",
   "description": "A simple transparent config file loader for Nodejs applications. any config field can be overriden using environmen variables",
   "main": "index.js",
   "scripts": {
@@ -20,5 +20,7 @@
   "bugs": {
     "url": "https://github.com/harish2704/tconfig/issues"
   },
-  "homepage": "https://github.com/harish2704/tconfig#readme"
+  "homepage": "https://github.com/harish2704/tconfig#readme",
+  "dependencies": {
+  }
 }