rst-wikilinks uses 'htmllink'

[git.ikiwiki.info.git] / doc / todo / syntax_highlighting.mdwn

diff --git a/doc/todo/syntax_highlighting.mdwn b/doc/todo/syntax_highlighting.mdwn
index 87ba77cade756756ed53e686034c924233697f6e..3d122829b2fe71bd156db25a87a693b617c57bb3 100644 (file)
--- a/doc/todo/syntax_highlighting.mdwn
+++ b/doc/todo/syntax_highlighting.mdwn
@@ -14,39 +14,63 @@ things easier for the user.
 * [[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
 * [[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]].
+  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]].
 * [[!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
+* [[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]]
   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`.
   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.
+* [[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 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).
+* [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]]
 
 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]]
 

-## 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?
-
+* [[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 
 * Nothing seems to support 
   [[wiki-formatted_comments|wiki-formatted_comments_with_syntax_plugin]]
   inside source files. Doing this probably means post-processing the 


@@ -73,54 +97,24 @@ releases the 5 or 6 language definitions he has running on his web site, it migh
 
 * 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
 
 * 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
 * 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 and comments
-
-Hmm, the [[ikiwiki/directive/format]] directive 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,
-which has its own set of problems.
+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]]