Re: Will there ever be a standard wiki-link?

[BPJ <melroch-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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On 2019-08-21 18:08, Joseph Reagle wrote:
> I'm noticing folks building wikis using markdown increasingly adopting the convention [[local link]]. However, gitit uses [local link](). Any chance one of these will be standardized or adopted by Pandoc?
> 


The attached Lua filter kind of does the trick if you want to generate 
Markdown e.g. for GitHub wikis. It converts three different "syntaxes"
into wiki link syntax:

   Get [[...]] style wiki links in Pandoc Markdown output:

   [PAGE NAME]() becomes [[PAGE NAME]]   (Formatting is lost)

   [FORMATTED TEXT]{wiki="PAGE NAME"}
       becomes [[PAGE NAME|FORMATTED TEXT]]

   `TEXT`{.wiki} becomes [[TEXT]]        (Very fast!)

       $ pandoc --lua-filter wiki-links.lua -w gfm
       [foo]() [*bar*]{wiki="baz"} `quux`{.wiki}
       ^D
       [[foo]] [[baz|*bar*]] [[quux]]



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--[=====================================================================[

  Get [[...]] style wiki links in Pandoc Markdown output:
  
  [PAGE NAME]() becomes [[PAGE NAME]]   (Formatting is lost)
  
  [FORMATTED TEXT]{wiki="PAGE NAME"} becomes [[PAGE NAME|FORMATTED TEXT]]
  
  `TEXT`{.wiki} becomes [[TEXT]]        (Very fast!)

      $ pandoc --lua-filter wiki-links.lua -w gfm
      [foo]() [*bar*]{wiki="baz"} `quux`{.wiki}
      ^D
      [[foo]] [[baz|*bar*]] [[quux]]

--]=====================================================================]

local wiki_class = "wiki" -- feel free to change this to e.g. "w"

function Link (elem)
  if "" == elem.target then
    local text = pandoc.utils.stringify(elem)
    return {
      pandoc.RawInline('markdown', '[[' .. text .. ']]' )
    }
  end
  return nil
end

function Code (elem)
  if elem.classes:includes(wiki_class) then
    return { pandoc.RawInline('markdown', '[[' .. elem.text .. ']]') }
  end
  return nil
end

function Span (elem)
  local wiki = elem.attributes[wiki_class]
  if wiki then
    -- construct the part before the formatted text
    prefix  = pandoc.RawInline('markdown', '[[' .. wiki .. '|')
    -- the part after the formatted text
    suffix = pandoc.RawInline('markdown', ']]')
    -- the formatted text == the span content
    local content = elem.content
    -- prepend the prefix
    table.insert(content, 1, prefix)
    -- append the suffix most efficiently
    content[#content+1] = suffix
    return content
  end
  return nil
end



--[=====================================================================[

  This software is Copyright (c) 2019 by Benct Philip Jonsson.
  
  This is free software, licensed under:
  
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--]=====================================================================]

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