119 lines
6.8 KiB
Markdown
119 lines
6.8 KiB
Markdown
There's been a lot of work on contrib syntax highlighting plugins. One should be
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picked and added to ikiwiki core.
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We want to support both converting whole source files into wiki
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pages, as well as doing syntax highlighting as a preprocessor directive
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(which is either passed the text, or reads it from a file). But,
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the [[ikiwiki/directive/format]] directive makes this easy enough to
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do if the plugin only supports whole source files. So, syntax plugins
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do no really need their own preprocessor directive, unless it makes
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things easier for the user.
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## The big list of possibilities
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* [[plugins/contrib/highlightcode]] uses [[!cpan Syntax::Highlight::Engine::Kate]],
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operates on whole source files only, has a few bugs (see
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[here](http://u32.net/Highlight_Code_Plugin/), and needs to be updated to
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support [[bugs/multiple_pages_with_same_name]]. (Currently a 404 :-( )
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* [[!cpan IkiWiki-Plugin-syntax]] only operates as a directive.
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Interestingly, it supports multiple highlighting backends, including Kate
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and Vim.
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* [[plugins/contrib/syntax]] only operates as a directive
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([[not_on_source_code_files|automatic_use_of_syntax_plugin_on_source_code_files]]),
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and uses [[!cpan Text::VimColor]].
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* [[plugins/contrib/sourcehighlight]] uses source-highlight, and operates on
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whole source files only. Needs to be updated to
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support [[bugs/multiple_pages_with_same_name]].
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* [[sourcecode|todo/automatic_use_of_syntax_plugin_on_source_code_files/discussion]]
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also uses source-highlight, and operates on whole source files.
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Updated to work with the fix for [[bugs/multiple_pages_with_same_name]]. Untested with files with no extension, e.g. `Makefile`.
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* [[users/jasonblevins]]'s code plugin uses source-highlight, and supports both
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whole file and directive use.
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* [hlsimple](http://pivot.cs.unb.ca/git/?p=ikiplugins.git;a=blob_plain;f=IkiWiki/Plugin/hlsimple.pm;hb=HEAD) is a wrapper for the the perl module [[!cpan Syntax::Highlight::Engine::Simple]]. This is pure perl, pretty simple, uses css. It ought to be pretty fast (according to the author, and just because it is not external).
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On the other hand, there are not many predefined languages yet. Defining language syntaxes is about as much
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work as source-highlight, but in perl. I plan to package the base module for debian. Perhaps after the author
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releases the 5 or 6 language definitions he has running on his web site, it might be suitable for inclusion in ikiwiki. [[DavidBremner]]
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* [[plugins/highlight]] uses [highlight](http://www.andre-simon.de) via
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its swig bindings. It supports whole files only. It uses either
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keepextension or noextension, as appropriate for the type of file.
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## General problems / requirements
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* Using non-perl syntax highlighting backends is slower. All things equal,
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I'd prefer either using a perl module, or a multiple-backend solution that
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can use a perl module as one option. (Or, if there's a great highlighter
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python module, we could use an external plugin..)
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Of course, some perl modules are also rather slow.. Kate, for example
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can only process about 33 lines of C code, or 14 lines of
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debian/changelog per second. That's **30 times slower than markdown**!
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By comparison, source-highlight can do about 5000 lines of C code per
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second... And launching the program 100 times on an empty file takes about
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5 seconds, which isn't bad. And, it has a C++ library, which it
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seems likely perl bindings could be written for, to eliminate
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even that overhead.
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> [highlight](http://www.andre-simon.de) has similar features to source-highlight, and swig bindings
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> that should make it trivial in principle to call from perl. I like highlight a bit better because
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> it has a pass-through feature that I find very useful. My memory is unfortunately a bit fuzzy as to how
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> well the swig bindings work. [[DavidBremner]]
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* Engines that already support a wide variety of file types are of
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course preferred. If the engine doesn't support a particular type
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of file, it could fall back to doing something simple like
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adding line numbers. (IkiWiki-Plugin-syntax does this.)
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* XHTML output.
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* Emitting html that uses CSS to control the display is preferred,
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since it allows for easy user customization. (Engine::Simple does
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this; Kate can be configured to do it; source-highlight can be
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made to do it via the switches `--css /dev/null --no-doc`)
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* Nothing seems to support
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[[wiki-formatted_comments|wiki-formatted_comments_with_syntax_plugin]]
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inside source files. Doing this probably means post-processing the
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results of the highlighting engine, to find places where it's highlighted
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comments, and then running them through the ikiwiki rendering pipeline.
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This seems fairly doable with [[!cpan Syntax::Highlight::Engine::Kate]],
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at least.
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* The whole-file plugins tend to have a problem that things that look like
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wikilinks in the source code get munged into links by ikiwiki, which can
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have confusing results. Similar problem with preprocessor directives.
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One approach that's also been requested for eg,
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[[plugins/contrib/mediawiki]] is to allow controlling which linkification
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types a page type can have on it.
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> The previous two points seem to be related. One thought: instead of
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> getting the source from the `content` parameter, the plugin could
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> re-load the page source. That would stop directives/links from
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> being processed in the source. As noted above, comments
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> could then be parsed for directives/links later.
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>
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> Would it be worth adding a `nodirectives` option when registering
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> an htmlize hook that switches off directive and link processing before
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> generating the html for a page?
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* The whole-file plugins all get confused if there is a `foo.c` and a `foo.h`.
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This is trivially fixable now by passing the keepextension option when
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registering the htmlize hooks, though. There's also a noextension option
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that should handle the
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case of source files with names that do not contain an extension (ie,
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"Makefile") -- in this case you just register the while filename
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in the htmlize hook.
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* Whole-file plugins register a bunch of htmlize hooks. The wacky thing
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about it is that, when creating a new page, you can then pick "c" or
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"h" or "pl" etc from the dropdown that normally has "Markdown" etc in it.
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Is this a bug, or a feature? Even if a feature, plugins with many
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extensions make the dropdown unusable..
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Perhaps the thing to do here is to use the new `longname` parameter to
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the format hook, to give them all names that will group together at or
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near the end of the list. Ie: "Syntax: perl", "Source code: c", etc.
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---
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I'm calling this [[done]] since I added the [[plugins/highlight]]
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plugin. There are some unresolved issues touched on here,
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but they either have the own other bug reports, or are documented
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as semi-features in the docs to the plugin. --[[Joey]]
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