support triton.createClient(...) without requiring a configDir

CHANGES.md

@@ -2,7 +2,9 @@
 
 ## 4.4.2 (not yet released)
 
-(nothing yet)
+- Support `triton.createClient(...)` creation without requiring a
+  `configDir`. Basically this then fallsback to a `TritonApi` with the default
+  config.
 
 
 ## 4.4.1

lib/config.js

@@ -79,22 +79,27 @@ function configPathFromDir(configDir) {
  *
  * This includes some internal data on keys with a leading underscore:
  *      _defaults       the defaults.json object
- *      _user           the "user" config.json object
- *      _configDir      the user config dir
+ *      _configDir      the user config dir (if one is provided)
+ *      _user           the "user" config.json object (if exists)
  *
+ * @param opts.configDir {String} Optional. A base dir for TritonApi config.
  * @returns {Object} The loaded config.
  */
 function loadConfig(opts) {
     assert.object(opts, 'opts');
-    assert.string(opts.configDir, 'opts.configDir');
+    assert.optionalString(opts.configDir, 'opts.configDir');
 
-    var configDir = common.tildeSync(opts.configDir);
-    var configPath = configPathFromDir(configDir);
+    var configDir;
+    var configPath;
+    if (opts.configDir) {
+        configDir = common.tildeSync(opts.configDir);
+        configPath = configPathFromDir(configDir);
+    }
 
     var c = fs.readFileSync(DEFAULTS_PATH, 'utf8');
     var _defaults = JSON.parse(c);
     var config = JSON.parse(c);
-    if (fs.existsSync(configPath)) {
+    if (configPath && fs.existsSync(configPath)) {
         c = fs.readFileSync(configPath, 'utf8');
         var _user = JSON.parse(c);
         var userConfig = JSON.parse(c);
@@ -121,7 +126,9 @@ function loadConfig(opts) {
         config._user = _user;
     }
     config._defaults = _defaults;
+    if (configDir) {
         config._configDir = configDir;
+    }
 
     return config;
 }

lib/index.js

@@ -81,7 +81,7 @@ var tritonapi = require('./tritonapi');
  *      - @param profileName {String} A Triton profile name. For any profile
  *        name other than "env", one must also provide either `configDir`
  *        or `config`.
- *        Either `profile` or `profileName` is requires. See discussion above.
+ *        Either `profile` or `profileName` is required. See discussion above.
  *      - @param configDir {String} A base config directory. This is used
  *        by TritonApi to find and store profiles, config, and cache data.
  *        For example, the `triton` CLI uses "~/.triton".