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+# node-error-ex [![Travis-CI.org Build Status](https://img.shields.io/travis/Qix-/node-error-ex.svg?style=flat-square)](https://travis-ci.org/Qix-/node-error-ex) [![Coveralls.io Coverage Rating](https://img.shields.io/coveralls/Qix-/node-error-ex.svg?style=flat-square)](https://coveralls.io/r/Qix-/node-error-ex)
+> Easily subclass and customize new Error types
+
+## Examples
+To include in your project:
+```javascript
+var errorEx = require('error-ex');
+```
+
+To create an error message type with a specific name (note, that `ErrorFn.name`
+will not reflect this):
+```javascript
+var JSONError = errorEx('JSONError');
+
+var err = new JSONError('error');
+err.name; //-> JSONError
+throw err; //-> JSONError: error
+```
+
+To add a stack line:
+```javascript
+var JSONError = errorEx('JSONError', {fileName: errorEx.line('in %s')});
+
+var err = new JSONError('error')
+err.fileName = '/a/b/c/foo.json';
+throw err; //-> (line 2)-> in /a/b/c/foo.json
+```
+
+To append to the error message:
+```javascript
+var JSONError = errorEx('JSONError', {fileName: errorEx.append('in %s')});
+
+var err = new JSONError('error');
+err.fileName = '/a/b/c/foo.json';
+throw err; //-> JSONError: error in /a/b/c/foo.json
+```
+
+## API
+
+#### `errorEx([name], [properties])`
+Creates a new ErrorEx error type
+
+- `name`: the name of the new type (appears in the error message upon throw;
+  defaults to `Error.name`)
+- `properties`: if supplied, used as a key/value dictionary of properties to
+  use when building up the stack message. Keys are property names that are
+  looked up on the error message, and then passed to function values.
+	- `line`: if specified and is a function, return value is added as a stack
+    entry (error-ex will indent for you). Passed the property value given
+    the key.
+  - `stack`: if specified and is a function, passed the value of the property
+    using the key, and the raw stack lines as a second argument. Takes no
+    return value (but the stack can be modified directly).
+  - `message`: if specified and is a function, return value is used as new
+    `.message` value upon get. Passed the property value of the property named
+    by key, and the existing message is passed as the second argument as an
+    array of lines (suitable for multi-line messages).
+
+Returns a constructor (Function) that can be used just like the regular Error
+constructor.
+
+```javascript
+var errorEx = require('error-ex');
+
+var BasicError = errorEx();
+
+var NamedError = errorEx('NamedError');
+
+// --
+
+var AdvancedError = errorEx('AdvancedError', {
+	foo: {
+		line: function (value, stack) {
+			if (value) {
+				return 'bar ' + value;
+			}
+			return null;
+		}
+	}
+}
+
+var err = new AdvancedError('hello, world');
+err.foo = 'baz';
+throw err;
+
+/*
+	AdvancedError: hello, world
+	    bar baz
+	    at tryReadme() (readme.js:20:1)
+*/
+```
+
+#### `errorEx.line(str)`
+Creates a stack line using a delimiter
+
+> This is a helper function. It is to be used in lieu of writing a value object
+> for `properties` values.
+
+- `str`: The string to create
+  - Use the delimiter `%s` to specify where in the string the value should go
+
+```javascript
+var errorEx = require('error-ex');
+
+var FileError = errorEx('FileError', {fileName: errorEx.line('in %s')});
+
+var err = new FileError('problem reading file');
+err.fileName = '/a/b/c/d/foo.js';
+throw err;
+
+/*
+	FileError: problem reading file
+	    in /a/b/c/d/foo.js
+	    at tryReadme() (readme.js:7:1)
+*/
+```
+
+#### `errorEx.append(str)`
+Appends to the `error.message` string
+
+> This is a helper function. It is to be used in lieu of writing a value object
+> for `properties` values.
+
+- `str`: The string to append
+  - Use the delimiter `%s` to specify where in the string the value should go
+
+```javascript
+var errorEx = require('error-ex');
+
+var SyntaxError = errorEx('SyntaxError', {fileName: errorEx.append('in %s')});
+
+var err = new SyntaxError('improper indentation');
+err.fileName = '/a/b/c/d/foo.js';
+throw err;
+
+/*
+	SyntaxError: improper indentation in /a/b/c/d/foo.js
+	    at tryReadme() (readme.js:7:1)
+*/
+```
+
+## License
+Licensed under the [MIT License](http://opensource.org/licenses/MIT).
+You can find a copy of it in [LICENSE](LICENSE).