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====== Syntax Highlighting ======

DokuWiki includes support for code syntax highlighting as described at the [[wiki:syntax#syntax_highlighting|syntax page]].

Starting with DokuWiki release "Greebo" some additional GeShi options for syntax highlighting are supported:

  * Enable line numbers
  * Start line numbers at line **n**
  * Highlight certain lines extra

All options are set by adding some key-value pairs to the standard ''code''-tag syntax. The following examples explain their usage.

===== Examples =====

The following code enables line numbers:
  <code JavaScript [enable_line_numbers="true"]>
  var de = function() {
  	return (typeof(window.de) == 'object') ? window.de : {};
  }();
  </code>

This is the result:

<code JavaScript [enable_line_numbers="true"]>
var de = function() {
	return (typeof(window.de) == 'object') ? window.de : {};
}();
</code>

The next example additionally highlights one line:
  <code JavaScript [enable_line_numbers="true",highlight_lines_extra="2"]>
  var de = function() {
  	return (typeof(window.de) == 'object') ? window.de : {};
  }();
  </code>

This is the result:
<code JavaScript [enable_line_numbers="true",highlight_lines_extra="2"]>
var de = function() {
	return (typeof(window.de) == 'object') ? window.de : {};
}();
</code>

You can also highlight multiple lines:
  <code JavaScript [enable_line_numbers="true",highlight_lines_extra="2,3"]>
  var de = function() {
  	return (typeof(window.de) == 'object') ? window.de : {};
  }();
  </code>

This is the result:
<code JavaScript [enable_line_numbers="true",highlight_lines_extra="2,3"]>
var de = function() {
	return (typeof(window.de) == 'object') ? window.de : {};
}();
</code>

Line numbers can start at any given value:
  <code C [enable_line_numbers="true", start_line_numbers_at="42"]>
  void main () {
      printf ("Hello World!");
      exit 0;
  }
  </code>

This is the result:

<code C [enable_line_numbers="true", start_line_numbers_at="42"]>
void main () {
    printf ("Hello World!");
    exit 0;
}
</code>