X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/bb93fccf0690344aa77f9538a508959a6de09847..512d860c169d776885922b7eaff0bcb2b722f12a:/doc/todo/syntax_highlighting.mdwn?ds=sidebyside diff --git a/doc/todo/syntax_highlighting.mdwn b/doc/todo/syntax_highlighting.mdwn index 3de3032b3..3d122829b 100644 --- a/doc/todo/syntax_highlighting.mdwn +++ b/doc/todo/syntax_highlighting.mdwn @@ -1,49 +1,82 @@ There's been a lot of work on contrib syntax highlighting plugins. One should be picked and added to ikiwiki core. -Ideally, it should support both converting whole source files into wiki +We want to support both converting whole source files into wiki pages, as well as doing syntax highlighting as a preprocessor directive -(which is either passed the text, or reads it from a file). +(which is either passed the text, or reads it from a file). But, +the [[ikiwiki/directive/format]] directive makes this easy enough to +do if the plugin only supports whole source files. So, syntax plugins +do no really need their own preprocessor directive, unless it makes +things easier for the user. ## The big list of possibilities -* [[plugins/contrib/highlightcode]] uses [[cpan Syntax::Highlight::Engine::Kate]], +* [[plugins/contrib/highlightcode]] uses [[!cpan Syntax::Highlight::Engine::Kate]], operates on whole source files only, has a few bugs (see [here](http://u32.net/Highlight_Code_Plugin/), and needs to be updated to - support [[bugs/multiple_pages_with_same_name]]. -* [[cpan IkiWiki-Plugin-syntax]] only operates as a directive. + support [[bugs/multiple_pages_with_same_name]]. (Currently a 404 :-( ) +* [[!cpan IkiWiki-Plugin-syntax]] only operates as a directive. Interestingly, it supports multiple highlighting backends, including Kate and Vim. * [[plugins/contrib/syntax]] only operates as a directive ([[not_on_source_code_files|automatic_use_of_syntax_plugin_on_source_code_files]]), - and uses [[cpan Text::VimColor]]. -* [[plugins/contrib/sourcehighlight]] uses src-highlight, and operates on + and uses [[!cpan Text::VimColor]]. +* [[plugins/contrib/sourcehighlight]] uses source-highlight, and operates on whole source files only. Needs to be updated to support [[bugs/multiple_pages_with_same_name]]. * [[sourcecode|todo/automatic_use_of_syntax_plugin_on_source_code_files/discussion]] - also uses src-highlight, and operates on whole source files. + also uses source-highlight, and operates on whole source files. Updated to work with the fix for [[bugs/multiple_pages_with_same_name]]. Untested with files with no extension, e.g. `Makefile`. -* [[users/jasonblevins]]'s code plugin uses src-highlight, and supports both - while file and directive use. - -## General problems - -* Using non-perl syntax highlighting backends is slow. I'd prefer either - using a perl module, or a multiple-backend solution that can use a perl - module as one option. (Or, if there's a great highlighter python module, - we could use an external plugin..) -* Currently no single plugin supports both modes of operation (directive - and whole source file to page). - - > This is now fixed by the [[ikiwiki/directive/format]] directive for all - > whole-source-file plugins, right? - +* [[users/jasonblevins]]'s code plugin uses source-highlight, and supports both + whole file and directive use. + +* [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). +On the other hand, there are not many predefined languages yet. Defining language syntaxes is about as much +work as source-highlight, but in perl. I plan to package the base module for debian. Perhaps after the author +releases the 5 or 6 language definitions he has running on his web site, it might be suitable for inclusion in ikiwiki. [[DavidBremner]] + +* [[plugins/highlight]] uses [highlight](http://www.andre-simon.de) via + its swig bindings. It optionally supports whole files, but also + integrates with the format directive to allow formatting of *any* of + highlight's supported formats. (For whole files, it uses either + keepextension or noextension, as appropriate for the type of file.) + +## General problems / requirements + +* Using non-perl syntax highlighting backends is slower. All things equal, + I'd prefer either using a perl module, or a multiple-backend solution that + can use a perl module as one option. (Or, if there's a great highlighter + python module, we could use an external plugin..) + + Of course, some perl modules are also rather slow.. Kate, for example + can only process about 33 lines of C code, or 14 lines of + debian/changelog per second. That's **30 times slower than markdown**! + + By comparison, source-highlight can do about 5000 lines of C code per + second... And launching the program 100 times on an empty file takes about + 5 seconds, which isn't bad. And, it has a C++ library, which it + seems likely perl bindings could be written for, to eliminate + even that overhead. + > [highlight](http://www.andre-simon.de) has similar features to source-highlight, and swig bindings + > that should make it trivial in principle to call from perl. I like highlight a bit better because + > it has a pass-through feature that I find very useful. My memory is unfortunately a bit fuzzy as to how + > well the swig bindings work. [[DavidBremner]] + +* Engines that already support a wide variety of file types are of + course preferred. If the engine doesn't support a particular type + of file, it could fall back to doing something simple like + adding line numbers. (IkiWiki-Plugin-syntax does this.) +* XHTML output. +* Emitting html that uses CSS to control the display is preferred, + since it allows for easy user customization. (Engine::Simple does + this; Kate can be configured to do it; source-highlight can be + made to do it via the switches `--css /dev/null --no-doc`) * Nothing seems to support [[wiki-formatted_comments|wiki-formatted_comments_with_syntax_plugin]] inside source files. Doing this probably means post-processing the results of the highlighting engine, to find places where it's highlighted comments, and then running them through the ikiwiki rendering pipeline. - This seems fairly doable with [[cpan Syntax::Highlight::Engine::Kate]], + This seems fairly doable with [[!cpan Syntax::Highlight::Engine::Kate]], at least. * The whole-file plugins tend to have a problem that things that look like wikilinks in the source code get munged into links by ikiwiki, which can @@ -64,65 +97,24 @@ pages, as well as doing syntax highlighting as a preprocessor directive * The whole-file plugins all get confused if there is a `foo.c` and a `foo.h`. This is trivially fixable now by passing the keepextension option when - registering the htmlize hooks, though. + registering the htmlize hooks, though. There's also a noextension option + that should handle the + case of source files with names that do not contain an extension (ie, + "Makefile") -- in this case you just register the while filename + in the htmlize hook. * Whole-file plugins register a bunch of htmlize hooks. The wacky thing about it is that, when creating a new page, you can then pick "c" or - "h" or "pl" etc from the dropdown that normally has "mdwn" etc in it. - Is this a bug, or a feature? (Even if a feature, plugins with many - extensions make the dropdown unusable.. One way to deal with that is have - a config setting that lists what extensions to offer highlighting for. - Most people won't need/want the dozens some engines support.) -* The per page highlighters can't handle creating wiki pages from - "Makefile", or other files without a significant extension. - Not clear how to fix this, as ikiwiki is very oriented toward file - extensions. The workaround is to use a directive on a wiki page, pulling - in the Makefile. - - > I wonder how hard it would be to make a patch whereby a file with - > no `.` in the name, and a name that matches a filetype, and where - > that filetype was registered `keepextension`, then the file is just - > chosen as the appropriate type. This would allow `Makefile` to - > work. - -like this: - - diff --git a/IkiWiki.pm b/IkiWiki.pm - index 8d728c9..1bd46a9 100644 - --- a/IkiWiki.pm - +++ b/IkiWiki.pm - @@ -618,6 +618,8 @@ sub pagetype ($) { - - if ($page =~ /\.([^.]+)$/) { - return $1 if exists $hooks{htmlize}{$1}; - + } elsif ($hooks{htmlize}{$page}{keepextension}) { - + return $page; - } - return; - } - -## format directive - -Rather than making syntax highlight plugins have to provide a preprocessor -directive as well as handling whole source files, perhaps a generic format -directive could be used: - - \[[!format pl """..."""]] - -That would run the text through the pl htmlizer, from the syntax hightligh -plugin. OTOH, if "rst" were given, it would run the text through the rst -htmlizer. So, more generic, allows mixing different types of markup on one -page, as well as syntax highlighting. Does require specifying the type of -format, instead of allowing it to be guessed (which some syntax highlighters -can do). (This directive is now implemented..) - -Hmm, this would also allow comments inside source files to have mdwn -embedded in them, without making the use of mdwn a special case, or needing -to postprocess the syntax highlighter output to find comments. - - /* \[[!format mdwn """ + "h" or "pl" etc from the dropdown that normally has "Markdown" etc in it. + Is this a bug, or a feature? Even if a feature, plugins with many + extensions make the dropdown unusable.. - This is a comment in my C file. You can use mdwn in here. + Perhaps the thing to do here is to use the new `longname` parameter to + the format hook, to give them all names that will group together at or + near the end of the list. Ie: "Syntax: perl", "Source code: c", etc. - """]] */ +--- -Note that this assumes that directives are expanded in source files. +I'm calling this [[done]] since I added the [[plugins/highlight]] +plugin. There are some unresolved issues touched on here, +but they either have the own other bug reports, or are documented +as semi-features in the docs to the plugin. --[[Joey]]