X-Git-Url: http://git.vanrenterghem.biz/git.ikiwiki.info.git/blobdiff_plain/25eafa8522a9480ca2abb6df45a613ac3d0b9880..1a3e6bf3e2eff84e6456b76a07568429473c4184:/doc/todo/Resolve_native_reStructuredText_links_to_ikiwiki_pages.mdwn diff --git a/doc/todo/Resolve_native_reStructuredText_links_to_ikiwiki_pages.mdwn b/doc/todo/Resolve_native_reStructuredText_links_to_ikiwiki_pages.mdwn index 49be3f30a..6e0f32fd5 100644 --- a/doc/todo/Resolve_native_reStructuredText_links_to_ikiwiki_pages.mdwn +++ b/doc/todo/Resolve_native_reStructuredText_links_to_ikiwiki_pages.mdwn @@ -2,12 +2,14 @@ _NB! this page has been refactored, hopefully it is clearer now_ _I propose putting discussion posts somewhere in the vincity of the secttion Individual reStructuredText Issues_ +## Design ## + **Goal** To be able to use rst as a first-class markup language in ikiwiki. I think most believe this is almost impossible (ikiwiki is built around markdown). -**Design** +## Wikilinks ## **WikiLinks**, first and foremost, are needed for a wiki. rST already allows specifying absolue and relative URL links, and relative links can be used to @@ -23,9 +25,16 @@ tie together wiki of rst documents. **Proposal 2**. This is a simple wiki page, with :wiki:`WikiLinks` and other_ links - + .. _other: wiki:wikilink + We can get rid of the role part as well for WikiLinks:: + + .. default-role:: wiki + + Enables `WikiLinks` but does not impact references such as ``other`` + This can be made the default for ikiwiki. + Benefits of using a `:role:` and a `wiki: page/subpage` URL scheme are following: @@ -37,9 +46,64 @@ following: .. role:: wiki (title) -*Implementation* there is no implementation of Proposal 2 but it should be -doable; adding a local role is trivial. Rewriting `wiki:` links could be -done in the format phase(?). +### Implementation ### + +Implementation of Proposal-2 wikilinks are in the branch +[rst-wikilinks][rst-wl] + + + This is a simple wiki page, with :wiki:`WikiLinks` and |named| links + + .. |named| wiki:: Some Page + + We can get rid of the role part as well for WikiLinks:: + + .. default-role:: wiki + + Enables `WikiLinks` but does not impact references such as ``named`` + This can be made the default for ikiwiki. + +[rst-wl]: http://github.com/engla/ikiwiki/commits/rst-wikilinks + +**rst-wikilinks** patch series includes changes at the end to use ikiwiki's +'htmllink' for the links (which is the only sane thing to do to work in all configurations). +This means a :wiki:`Link` should render just exactly like [[Link]] whether +the target exists or not. + +On top of **rst-wikilinks** is [rst-customize][rst-custom] which adds two +power user features: Global (python) file to read in custom directives +(unsafe), and a wikifile as "header" file for all parsed .rst files (safe, +but disruptive since all .rst depend on it). Well, the customizations have +to be picked and chosen from this, but at least the global python file can +be very convenient. + +> Did you consider just including the global rst header text into an item +> in the setup file? --[[Joey]] +> +>> Then `rst_header` would not be much different from the python script +>> `rst_customize`. rst_header is as safe as other files (though disruptive +>> as noted), so it should/could be a editable file in the Wiki. A Python +>> script of course can not be. There is nothing you can do in the +>> rst_header (that you sensibly would do, I think) that couldn't be done in +>> the Python script. `rst_header` has very limited use, but it is another +>> possibility, mainly for the user-editable aspect. --[[ulrik]] +>> +>> (I foresaw only two things to be added to the rst_header: the default +>> role could be configured there (as with rst_wikirole), and if you have a +>> meta-role like :shortcut:, shortcuts could be defined there.) +> +> I have some discussion on the [docutils mailing list][dml], the developers +> of docutils seems to favor "Proposal 1", while I defend my ideas. They +> want all users of ReST to use only the basic featureset to remain +> compatible, of course. -- [[ulrik]] + +[dml]: http://thread.gmane.org/gmane.text.docutils.user/5376 + +Some rst-custom [examples are here](http://kaizer.se/wiki/rst_examples/) + +[rst-custom]: http://github.com/engla/ikiwiki/commits/rst-customize + +## Directives ## Now **Directives**: As it is now, ikiwiki goes though (roughly): filter, preprocess, htmlize, format as major stages of content @@ -67,8 +131,161 @@ picture before it. but rST directives allow a direct line (after :: on first line), an option list, and a content block. - -**Discussion** +> You've done a lot of work already, but ... +> +> The filter approach seems much simpler than the other approaches +> for users to understand, since they can just use identical ikiwiki +> markup on rst pages as they would use anywhere else. This is very desirable +> if the wiki allows rst in addition to mdwn, since then users don't have +> to learn two completly different ways of doing wikilinks and directives. +> I also wonder if even those familiar with rst would find entirely natural +> the ways you've found to shoehorn in wikilinks, named wikilinks, and ikiwiki +> directives? +> +> Htmlize in filter avoids these problems. It also leaves open the possibility +> that ikiwiki could become smarter about the rendering chain later, and learn +> to use a better order for rst (ie, htmlize first). If that later happened, +> the htmlize in filter hack could go away. --[[Joey]] + +> (BTW, the [[plugins/txt]] plugin already does html formatting +> in filter, for similar reasons.) --[[Joey]] + +>> Thank you for the comments! Forget the work, it's not so much. +>> I'd rank the :wiki: link addition pretty high, and the other changes way +>> behind that: +>> +>> The :wiki:`Wiki Link` syntax is *very* appropriate as rst syntax +>> since it fits well with other uses of roles (notice that :RFC:`822` +>> inserts a link to RFC822 etc, and that the default role is a *title* role +>> (title of some work); thus very appropriate for medium-specific links like +>> wiki links. So I'd rank :wiki: links a worthwhile addition regardless of +>> outcome here, since it's a very rst-like alternative for those who wish to +>> use more rst-like syntax (and documents degrades better outside the wiki as +>> noted). +>> +>>> Unsure about the degredation argument. It will work some of +>>> the time, but ikiwiki's [[ikiwiki/subpage/linkingrules]] +>>> are sufficiently different from normal html relative link +>>> rules that it often won't work. --[[Joey]] +>>> +>>>> With degradation I mean that if you take a file out of the wiki; the +>>>> links degrade to stylized text. If using default role, they degrade to +>>>> :title: which renders italicized text (which I find is exactly +>>>> appropriate). There is no way for them to degrade into links, except of +>>>> course if you reimplement the :wiki: role. You can also respecify +>>>> either the default role (the `wikilink` syntax) or the :wiki: role (the +>>>> :wiki:`wikilink` syntax) to any other markup, for example None. +>>>> --[[ulrik]] +>> +>> The named link syntax (just like the :wiki: role) are inspired from +>> [trac][tracrst] and a good fit, but only if the wiki is committed to +>> using only rst, which I don't think is the case. +>> +>> The rst-customize changes are very useful for custom directive +>> installations (like the sourcecode directive, or shortcut roles I show +>> in the examples page), but there might be a way for the user to inject +>> docutils addons that I'm missing (one very ugly way would be to stick +>> them in sitecustomize.py which affects all Python programs). +>> +>> With the presented changes, I already have a working RestructuredText +>> wiki, but I'm admitting that using .. raw:: html around all directives is +>> very ugly (I use few directives: inline, toggle, meta, tag, map) +>> +>> On filter/htmlize: Well **rst** is clearly antisocial: It can't see HTML, +>> and ikiwiki directives are wrappend in paragraph tags. (For wikilinks +>> this is probably no problem). So the suggestion about `.. ikiwiki:` is +>> partly because it looks good in rst syntax, but also since it would emit +>> a div to wrap around the element instead of a paragraph. +>> +>> I don't know if you mean that rst could be reordered to do htmlize before +>> other phases? rst must be before any preprocess hook to avoid seeing any +>> HTML. +>> +>>> One of my long term goals is to refactor all the code in ikiwiki +>>> that manually runs the various stages of the render pipeline, +>>> into one centralized place. Once that's done, that place can get +>>> smart about what order to run the stages, and use a different +>>> order for rst. --[[Joey]] +>> +>> If I'm thinking right, processing to HTML already in filter means any +>> processing in scan can be reused directly (or skipped if it's legal to +>> emit 'add_link' in filter.) +>> +>> -- [[ulrik]] + +>>> Seems it could be, yes. --[[Joey]] +>>> +>>>> It is not clear how we can work around reST wrapping directives with +>>>> paragraph tags. Also, some escaping of xml characters & <> might +>>>> happen, but I can't imagine right now what breakage can come from that. +>>>> -- [[ulrik]] + +[tracrst]: http://trac.edgewall.org/wiki/WikiRestructuredText + +### Implementation ### + +Preserving indents in the preprocessor are in branch [pproc-indent][ppi] + +(These simple patches come with a warning: _Those are the first lines of +Perl I've ever written!_) + +> This seems like a good idea, since it solves issues for eg, indented +> directives in mdwn as well. But, looking at the diff, I see a clear bug: +> +> - return "[[!$command ". +> + $result = "[[!$command ". +> +> That makes it go on and parse an infinitely nested directive chain, instead +> of immediatly throwing an error. +> +> Also, it seems that the "indent" matching in the regexps may be too broad, +> wouldn't it also match whitespace before a directive that was not at the beginning +> of a line, and treat it as an indent? With some bad luck, that could cause mdwn +> to put the indented output in a pre block. --[[Joey]] +> +>> You are probably right about the bug. I'm not quite sure what the nested +>> directives examples looks like, but I must have overlooked how the +>> recursion counter works; I thought simply changing if to elif the next +>> few lines would solve that. I'm sorry for that! +>> +>> We don't have to change the `$handle` function at all, if it is possible +>> to do the indent substitution all in one line instead of passing it to +>> handle, I don't know if it is possible to turn: +>> +>> $content =~ s{$regex}{$handle->($1, $2, $3, $4, $5)}eg; +>> +>> into +>> +>> $content =~ s{$regex}{s/^/$1/gm{$handle->($2, $3, $4, $5)}}eg; +>> +>> Well, no idea how that would be expressed, but I mean, replace the indent +>> directly in $handle's return value. +>> +>>> Yes, in effect just `indent($1, handle->($2,$,4))` --[[Joey]] +>> +>> The indent-catching regex is wrong in the way you mention, it has been +>> nagigng my mind a bit as well; I think matching start of line + spaces +>> and tabs is the only thing we want. +>> -- [[ulrik]] +>> +>>> Well, seems you want to match the indent at the start of the line containing +>>> the directive, even if the directive does not start the line. That would +>>> be quite hard to make a regexp do, though. --[[Joey]] +>> +>> I wasted a long time getting the simpler `indent($1, handle->($2,$,4))` to +>> work (remember, I don't know perl at all). Somehow `$1` does not arrive, I +>> made a simple testcase that worked, and I conclude something inside $handle +>> results in the value of $1 not arriving as it should! +>> +>> Anyway, instead a very simple incremental patch is in [pproc-indent][ppi] +>> where the indentation regex is `(^[ \t]+|)` instead, which seems to work +>> very well (and the regex is multiline now as well). I'm happy to rebase the +>> changes if you want or you can just squash the four patches 1+3 => 1+1 +>> -- [[ulrik]] + +[ppi]: http://github.com/engla/ikiwiki/commits/pproc-indent + +## Discussion ## I guess you (or someone) has been through this before and knows why it simply won't work. But I hoped there was something original in the above; @@ -79,15 +296,8 @@ and I know there are wiki installations where rST works. --ulrik * We resolve rST links without definition, we don't help resolving defined relative links, so we don't support specifying link name and target separately. - -> I found out this is possible by using rST subsitutions. So to do [[Version history...|releases]] -> you would use: -> -> `|releases|_` -> `.. |releases| replace:: Version history...` -> Which does not seem to have an inline equivalent. Using non-resolved links there is the alternative: -> -> ``Version history `_`. --ulrik [kaizer.se] + + * Resolved by |replacement| links with the wiki:: directive. **A first implementation: Resolving unmatched links** @@ -112,110 +322,12 @@ The page is rST-parsed once in 'scan' and once in 'htmlize' (the first to genera >> However, I think that if the cache does not work for a big load, it should >> not work at all; small loads are small so they don't matter. --ulrik -Patch follows: - ----- -
-	From 486fd79e520da1d462f00f40e7a90ab07e9c6fdf Mon Sep 17 00:00:00 2001
-	From: Ulrik Sverdrup 
-	Date: Thu, 17 Sep 2009 15:18:50 +0200
-	Subject: [PATCH] rst: Resolve native reStructuredText links to ikiwiki pages
-
-	Links in rST use syntax `Like This`_ or OneWordLink_, and are
-	generally used for relative or absolue links, with an auxiliary
-	definition:
-
-	.. _`Like This`: http://ikiwiki.info
-	.. _OneWordLink: relative
-
-	We can hook into docutils to resolve unresolved links so that rST
-	links without definition can be resolved to wiki pages. This enables
-	WikiLink_ to link to [[WikiLink]] (if no .. _WikiLink is specified).
-
-	Comparing to Ikiwiki's wikilinks
-
-	[[blogging|blog]] specifies a link to the page blog, with the name
-	blogging. In rST we should use blogging_
-
-	.. _blogging: blog
-
-	*However*, note that this patch does not hook into this. What we
-	resolve in this patch is finding the appropriate "_blogging" if it is
-	not found, not resolving the address 'blog'.
-	---
-	 plugins/rst |   46 +++++++++++++++++++++++++++++++++++++++++-----
-	 1 files changed, 41 insertions(+), 5 deletions(-)
-
-	diff --git a/plugins/rst b/plugins/rst
-	index a2d07eb..a74baa8 100755
-	--- a/plugins/rst
-	+++ b/plugins/rst
-	@@ -6,22 +6,58 @@
-	 # based a little bit on rst.pm by Sergio Talens-Oliag, but only a little bit. :)
-	 #
-	 # Copyright © martin f. krafft 
-	+# Copyright © Ulrik Sverdrup , 2009
-	+#
-	 # Released under the terms of the GNU GPL version 2
-	 #
-	+
-	 __name__ = 'rst'
-	 __description__ = 'xml-rpc-based ikiwiki plugin to process RST files'
-	-__version__ = '0.3'
-	+__version__ = '0.3+'
-	 __author__ = 'martin f. krafft '
-	 __copyright__ = 'Copyright © ' + __author__
-	 __licence__ = 'GPLv2'
-	 
-	 from docutils.core import publish_parts;
-	+from docutils.writers import html4css1
-	 from proxy import IkiWikiProcedureProxy
-	 
-	-def rst2html(proxy, *kwargs):
-	-    # FIXME arguments should be treated as a hash, the order could change
-	-    # at any time and break this.
-	-    parts = publish_parts(kwargs[3], writer_name='html',
-	+class IkiwikiWriter(html4css1.Writer):
-	+    def resolve_node(self, node):
-	+        refname = node.get('refname', None)
-	+        if not refname:
-	+            return False
-	+
-	+        bestlink = self.proxy.rpc('bestlink', self.page, refname)
-	+
-	+        node.resolved = 1
-	+        node['class'] = 'wiki'
-	+        del node['refname']
-	+
-	+        if not bestlink:
-	+            rel_url = "#"
-	+        else:
-	+            rel_url = self.proxy.rpc('urlto', bestlink, self.page)
-	+            self.proxy.rpc('add_link', self.page, bestlink)
-	+        node['refuri'] = rel_url
-	+        self.proxy.rpc('debug', "Emitting link %s => %s" % (refname, rel_url))
-	+        return True
-	+
-	+    resolve_node.priority = 1
-	+
-	+    def __init__(self, proxy, page):
-	+        html4css1.Writer.__init__(self)
-	+        self.proxy = proxy
-	+        self.page = page
-	+        self.unknown_reference_resolvers = (self.resolve_node, )
-	+
-	+def rst2html(proxy, *args):
-	+    # args is a list paired by key, value, so we turn it into a dict
-	+    kwargs = dict((k, v) for k, v in zip(*[iter(args)]*2))
-	+    page = kwargs['page']
-	+
-	+    parts = publish_parts(kwargs['content'],
-	+                          writer=IkiwikiWriter(proxy, page),
-	                           settings_overrides = { 'halt_level': 6
-	                                                , 'file_insertion_enabled': 0
-	                                                , 'raw_enabled': 1
-	-- 
-	1.6.4
-
-
----- +----- + +Another possiblity is using empty url for wikilinks (gitit uses this approach), for example: + + `SomePage <>`_ + +Since it uses *empty* url, I would like to call it *proposal 0* :-) --[weakish] + +[weakish]: http://weakish.pigro.net