Big refactoring.

* Don't override user defined styles
* Better modularisation of highlighters
* Allow to define which highlighters are activated
* Allow to define the order in which they are defined
* Minor performance optimizations
* Fixed some variables leak
* Improve documentation
* Brackets highlighter: use ZSH_HIGHLIGHT_STYLES instead of a specific array

tests/README.md

@@ -0,0 +1,20 @@
+zsh-syntax-highlighting / tests
+===============================
+
+Utility scripts for testing zsh-syntax-highlighting highlighters.
+
+The tests expect the highlighter directory to contain a `test-data` directory with test data files. See the [main highlighter](../highlighters/main/test-data) for examples.
+
+
+highlighting test
+-----------------
+[`test-highlighting.zsh`](test-highlighting.zsh) tests the correctness of the highlighting. Usage:
+
+    zsh test-highlighting.zsh <HIGHLIGHTER NAME>
+
+
+performance test
+----------------
+[`test-perfs.zsh`](test-highlighting.zsh) measures the time spent doing the highlighting. Usage:
+
+    zsh test-perfs.zsh <HIGHLIGHTER NAME>