Improve documentation about configuration (#209)

docs/configuration.md

@@ -19,8 +19,17 @@ a `TwigCsFixer\Config\Config` class:
 <?php
 
 $ruleset = new TwigCsFixer\Ruleset\Ruleset();
-$ruleset->addStandard(new TwigCsFixer\Standard\Twig());
-$ruleset->addRule(new TwigCsFixer\Rules\Whitespace\EmptyLinesRule());
+
+// You can start from a default standard
+$ruleset->addStandard(new TwigCsFixer\Standard\TwigCsFixer());
+
+// And then add/remove/override some rules
+$ruleset->addRule(new TwigCsFixer\Rules\File\FileExtensionRule()());
+$ruleset->removeRule(new TwigCsFixer\Rules\Whitespace\EmptyLinesRule());
+$ruleset->overrideRule(new TwigCsFixer\Rules\Punctuation\PunctuationSpacingRule(
+    ['}' => 1],
+    ['{' => 1],
+));
 
 $config = new TwigCsFixer\Config\Config();
 $config->setRuleset($ruleset);

docs/rules.md

@@ -9,11 +9,11 @@
 - **IncludeFunctionRule**: ensures that include function is used instead of function tag.
 - **OperatorNameSpacingRule**: ensures there is no consecutive spaces inside operator names.
 - **OperatorSpacingRule**: ensures there is one space before and after an operator except for '..'.
-- **PunctuationSpacingRule**: ensures there is no space before and after a punctuation except for ':' and ','.
+- **PunctuationSpacingRule**: ensures there is no space before and after a punctuation except for ':' and ',' (configurable).
 - **TrailingCommaSingleLineRule**: ensures that single-line arrays, objects and argument lists do not have a trailing comma.
 - **BlankEOFRule**: ensures that files ends with one blank line.
 - **EmptyLinesRule**: ensures that 2 empty lines do not follow each other.
-- **IndentRule**: ensures that files are not indented with tabs.
+- **IndentRule**: ensures that files are not indented with tabs (configurable).
 - **TrailingSpaceRule**: ensures that files have no trailing spaces.
 
 ### Non-fixable
@@ -25,6 +25,21 @@ To use these rules, you have to [allow non-fixable rules](configuration.md#non-f
 - **VariableNameRule**: ensures that variable name uses snake_case (configurable).
 - **FileExtensionRule**: ensures that file name uses two extensions (e.g. index.html.twig).
 
+### Configurable rules
+
+Some rules are configurable, those rule are implementing `\TwigCsFixer\Rules\ConfigurableRuleInterface`.
+
+The easiest way to see how to configure such rules is to look at the `__construct` definition
+of those rules. For instance:
+```php
+new TwigCsFixer\Rules\Punctuation\PunctuationSpacingRule(
+    ['}' => 1],
+    ['{' => 1],
+);
+
+new TwigCsFixer\Rules\Whitespace\IndentRule(3);
+```
+
 ## Standards
 
 **Twig**: