Re: Output-Format Plain removes Markdown-Hyperlinks []()

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

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Ack I forgot the attachments! Typical... :-)

On 2022-01-15 15:41, BPJ wrote:
> Here with pandoc 2.16.2 `[TEXT](URL)` is automatically turned into `TEXT 
> <URL>` in plain output, being smart enough to do the right thing if the 
> URL appears in the link text or if it was `<URL>` already.
> 
> Anyway attached is a Lua filter which I use to get the same effect in 
> other output formats.  Unless you are running a very old version of 
> pandoc it should do what you want unless pandoc does it already.
> 
> On 2022-01-14 12:20, Peter Mueller wrote:
>> Hello together.
>>
>> I'm working on a project where we use one input markdown file to create
>> HTML but also TXT files.
>> The problem I have is with markdown hyperlinks in the form of []().
>>
>> While for the output format html they are kept:
>> *$ echo "prefix [this is a link](www.google.de) suffix" | pandoc -f
>> markdown -t html*
>> *<p>prefix <a href="www.google.de">this is a link</a> suffix</p>*
>>
>> the url is completely removed for plain output:
>> *$ echo "prefix [this is a link](www.google.de) suffix" | pandoc -f
>> markdown -t plain*
>> *prefix this is a link suffix*
>>
>> Is there a way/plugin to keep the url within the plain output?
>> (e.g.  by keeping the markdown  [this is a link](www.google.de) as it is,
>> but handling all other markdown as usual?)
>>
>> Thank you
>> Peter
>>
> 

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-- Pandoc filter which turns `[TEXT](URL)` into `TEXT \<URL>`

-- Save some typing and sidewise space! :-)
local p = assert(pandoc, "Cannot find pandoc library")
local u = assert(p.utils, "Cannot find pandoc.utils library")

-- Classes which Pandoc inserts into links with URL/email as link text
local plain_classes = { 'uri', 'email' }

-- Get a nice-looking URL/email string
local function bare_url (url)
  -- Remove wrapping angles just in case
  url = tostring(url):gsub("^%<", "")
  url = url:gsub("%>$", "")
  -- Remove the mailto protocol if any
  url = url:gsub("^mailto%:", "")
  return url
end

-- Get a pattern which matches a string literally
-- by escaping all punctuation chars in the string
local function quote_pat (str)
  return tostring(str):gsub('%p', '%%%0')
end

-- The main action
function Link (link)
  -- Get the link text as a list of inlines
  local ct = link.content
  local url = link.target
  -- Return just the link text if the link is local
  if url:match('^%#') then
    return ct
  end
  -- Get the link text as a string (without formatting)
  local txt = u.stringify(link)
  -- See if we got one of Pandoc's automatic classes
  for _, cls in ipairs(plain_classes) do
    if link.classes:includes(cls) then
      -- If yes return just `<URL>` or `<EMAIL>`
      return p.Str("<" .. tostring(bare_url(txt)) .. ">")
    end
  end
  -- Else if the link text contains the URL/email
  -- return just the link text
  if txt:match(quote_pat(bare_url(url))) then
    return ct
  end
  -- Else append `<URL>` or `<EMAIL>` to the link text
  ct:extend({ p.Space(), p.Str("<" .. tostring(bare_url(url)) .. ">") })
  return ct
end

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Go to our site \<http://example.org>.

You can find us at http://example.org.

Go to our site at \<http://example.org>.

Drop us a mail \<info\@example.org>.

Send a mail to \<info\@example.org>.

Send a mail to \<info\@example.org>.

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Go to our site <http://example.org>.

You can find us at http://example.org.

Go to our site at <http://example.org>.

Drop us a mail <info@example.org>.

Send a mail to <info@example.org>.

Send a mail to <info@example.org>.

[-- Attachment #6: test.md --]
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Go to [our site](http://example.org).

[You can find us at http://example.org](http://example.org).

Go to our site at <http://example.org>.

Drop us a [mail](mailto:info-hcDgGtZH8xNAfugRpC6u6w@public.gmane.org).

Send a mail to <info-hcDgGtZH8xNAfugRpC6u6w@public.gmane.org>.

[Send a mail to <info-hcDgGtZH8xNAfugRpC6u6w@public.gmane.org>](mailto:info-hcDgGtZH8xNAfugRpC6u6w@public.gmane.org).


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Go to our site <http://example.org>.

You can find us at http://example.org.

Go to our site at <http://example.org>.

Drop us a mail <info@example.org>.

Send a mail to <info@example.org>.

Send a mail to <info@example.org>.