highlight: New plugin supporting syntax highlighting of pretty much anything.

* debian/control: Add suggests for libhighlight-perl, although
  that package is not yet created by Debian's highlight source package.
  (See #529869)

1 files changed, 72 insertions, 0 deletions

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+[[!template id=plugin name=highlight author="[[Joey]]"]]
+[[!tag type/format]]
+
+This plugin allows ikiwiki to syntax highlight source files, using
+a fast syntax highlighter that supports over a hundred programming
+languages and file formats.
+
+## prerequisites
+
+You will need to install the perl bindings to the
+[highlight library](http://www.andre-simon.de/), which in Debian
+are in the [[!debpkg libhighlight-perl]] package.
+
+## configuration
+
+Nothing will be highlighted by default.
+To enable syntax highlighting, use the `tohighlight` setting in your
+setup file to control which files should be syntax highlighted.
+Here is a typical setting for it, enabling highlighting for files
+with the extensions .c, etc, and also for any files named "Makefile".
+
+	tohighlight => .c, .h, .cpp, .pl, .py, Makefile:make",
+
+It knows what language to use for most filename extensions (see
+`/etc/highlight/filetypes.conf` for a partial list), but if you want to
+bind an unusual filename extension, or any file without an extension
+(such as a Makefile), to a language, you can do so by appending a colon
+and the name of the language, as illustrated for Makefiles above.
+
+## embedding highlighted code
+
+To embed highlighted code on a page, you can use the
+[[ikiwiki/directive/format]] directive.
+
+For example:
+
+	\[[!format c """
+	void main () {
+		printf("hello, world!");
+	}
+	"""]]
+
+You can do this for any of the extensions/filenames enabled in
+`tohighlight`.
+
+## colors
+
+The colors etc used for the syntax highlighting are entirely configurable
+by CSS. See ikiwiki's [[style.css]] for the defaults.
+
+## limitations
+
+With this plugin enabled, source files become full-fledged ikiwiki pages,
+which means they can include [[WikiLinks|ikiwiki/wikilink]] and
+[[directives|ikiwiki/directive]] like any other page can, and are also
+affected by the [[smiley]] plugin, if it is enabled. This can be
+annoying if your code accidentially contains things that look like those.
+
+On the other hand, this also allows your syntax highlighed
+source code to contain markdown formatted comments and hyperlinks
+to other code files, like this:
+
+	/* \[[!format mdwn """
+		This comment will be formatted as *markdown*!
+
+		See [[bar.h]].
+	""]] */
+
+## security
+
+This lets anyone who can edit a page in your wiki also edit
+source code files that are in your wiki. Use appropriate caution.