Lua Filter for \citeauthor and \citetitle in HTML

Lua Filter for \citeauthor and \citetitle in HTML

[Bernardo C. D. A. Vasconcelos]

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An HTML equivalent of these commands was proposed in Github, but there was 
no feasible way for it to be implemented as part of Citeproc. I suggested a 
Lua filter to achieve this and John said it sounded doable. 

I learned some Lua and experimented, but I didn't come close enough to have 
something worth sharing. In short: I imagined something like 
`[@Ref]{.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: 
parsing the bib data and saving it to a Lua table (stuck here); filtering 
spans; checking the type and performing the replacement (not clear to me 
either what the correct way would be to replace the id with the data or if 
this would have to run before/after citeproc).

Any pointers would be much appreciated.

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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bastien DUMONT]

I think that it would be better to run it before citeproc, since you don't want citeproc output (unless you want to still benefit from the "ibid./cited" feature). Citeproc would not help you so much here because it does not tag the different parts of a formatted citation. On the other hand, parsing the bib file would be rather simple if it is in the CSL JSON format: then you would just have to use one of the JSON modules for Lua to import your bibliographic references into a Lua table. If you use Bib(La)TeX, you can convert a .bib file to a .json with `pandoc -f bibtex (or biblatex) -t csljson myfile.bib -o myfile.json`.

Le Saturday 28 January 2023 à 02:07:54PM, Bernardo C. D. A. Vasconcelos a écrit :
> An HTML equivalent of these commands was proposed in Github, but there was no
> feasible way for it to be implemented as part of Citeproc. I suggested a Lua
> filter to achieve this and John said it sounded doable. 
> 
> I learned some Lua and experimented, but I didn't come close enough to have
> something worth sharing. In short: I imagined something like `[@Ref]
> {.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: parsing the bib
> data and saving it to a Lua table (stuck here); filtering spans; checking the
> type and performing the replacement (not clear to me either what the correct
> way would be to replace the id with the data or if this would have to run
> before/after citeproc).
> 
> Any pointers would be much appreciated.
> 
> --
> You received this message because you are subscribed to the Google Groups
> "pandoc-discuss" group.
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> pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com.
> 
> References:
> 
> [1] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> [2] https://groups.google.com/d/msgid/pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&utm_source=footer

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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bernardo C. D. A. Vasconcelos]

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Thanks for the feedback, Bastien! 
Can you think of a similar example script that contains the function to 
parse the bib data? I searched for it online to no avail.
On Saturday, January 28, 2023 at 7:35:40 PM UTC-3 Bastien Dumont wrote:

> I think that it would be better to run it before citeproc, since you don't 
> want citeproc output (unless you want to still benefit from the 
> "ibid./cited" feature). Citeproc would not help you so much here because it 
> does not tag the different parts of a formatted citation. On the other 
> hand, parsing the bib file would be rather simple if it is in the CSL JSON 
> format: then you would just have to use one of the JSON modules for Lua to 
> import your bibliographic references into a Lua table. If you use 
> Bib(La)TeX, you can convert a .bib file to a .json with `pandoc -f bibtex 
> (or biblatex) -t csljson myfile.bib -o myfile.json`.
>
> Le Saturday 28 January 2023 à 02:07:54PM, Bernardo C. D. A. Vasconcelos a 
> écrit :
> > An HTML equivalent of these commands was proposed in Github, but there 
> was no
> > feasible way for it to be implemented as part of Citeproc. I suggested a 
> Lua
> > filter to achieve this and John said it sounded doable. 
> > 
> > I learned some Lua and experimented, but I didn't come close enough to 
> have
> > something worth sharing. In short: I imagined something like `[@Ref]
> > {.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: parsing 
> the bib
> > data and saving it to a Lua table (stuck here); filtering spans; 
> checking the
> > type and performing the replacement (not clear to me either what the 
> correct
> > way would be to replace the id with the data or if this would have to run
> > before/after citeproc).
> > 
> > Any pointers would be much appreciated.
> > 
> > --
> > You received this message because you are subscribed to the Google Groups
> > "pandoc-discuss" group.
> > To unsubscribe from this group and stop receiving emails from it, send 
> an email
> > to [1]pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> > To view this discussion on the web visit [2]
> https://groups.google.com/d/msgid/
> > pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com.
> > 
> > References:
> > 
> > [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> > [2] 
> https://groups.google.com/d/msgid/pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&utm_source=footer
>
>

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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bastien DUMONT]

Do you mean a function that parses the .bib file directly? I really think that it would be easier to convert the .bib file to a CSL JSON file and import it via a JSON parser.

Le Monday 30 January 2023 à 08:49:36AM, Bernardo C. D. A. Vasconcelos a écrit :
> Thanks for the feedback, Bastien! 
> Can you think of a similar example script that contains the function to parse
> the bib data? I searched for it online to no avail.
> On Saturday, January 28, 2023 at 7:35:40 PM UTC-3 Bastien Dumont wrote:
> 
>     I think that it would be better to run it before citeproc, since you don't
>     want citeproc output (unless you want to still benefit from the "ibid./
>     cited" feature). Citeproc would not help you so much here because it does
>     not tag the different parts of a formatted citation. On the other hand,
>     parsing the bib file would be rather simple if it is in the CSL JSON
>     format: then you would just have to use one of the JSON modules for Lua to
>     import your bibliographic references into a Lua table. If you use Bib(La)
>     TeX, you can convert a .bib file to a .json with `pandoc -f bibtex (or
>     biblatex) -t csljson myfile.bib -o myfile.json`.
> 
>     Le Saturday 28 January 2023 à 02:07:54PM, Bernardo C. D. A. Vasconcelos a
>     écrit :
>     > An HTML equivalent of these commands was proposed in Github, but there
>     was no
>     > feasible way for it to be implemented as part of Citeproc. I suggested a
>     Lua
>     > filter to achieve this and John said it sounded doable. 
>     >
>     > I learned some Lua and experimented, but I didn't come close enough to
>     have
>     > something worth sharing. In short: I imagined something like `[@Ref]
>     > {.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: parsing the
>     bib
>     > data and saving it to a Lua table (stuck here); filtering spans; checking
>     the
>     > type and performing the replacement (not clear to me either what the
>     correct
>     > way would be to replace the id with the data or if this would have to run
>     > before/after citeproc).
>     >
>     > Any pointers would be much appreciated.
>     >
>     > --
>     > You received this message because you are subscribed to the Google Groups
>     > "pandoc-discuss" group.
>     > To unsubscribe from this group and stop receiving emails from it, send an
>     email
>     > to [1]pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>     > To view this discussion on the web visit [2][1]https://groups.google.com/
>     d/msgid/
>     > pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%[2]
>     40googlegroups.com.
>     >
>     > References:
>     >
>     > [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>     > [2] [3]https://groups.google.com/d/msgid/pandoc-discuss/
>     51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&
>     utm_source=footer
> 
> 
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> pandoc-discuss/4865a325-42c0-4245-b992-b4fbdeab576en%40googlegroups.com.
> 
> References:
> 
> [1] https://groups.google.com/d/msgid/
> [2] http://40googlegroups.com/
> [3] https://groups.google.com/d/msgid/pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&utm_source=footer
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Re: Lua Filter for \citeauthor and \citetitle in HTML

[John MacFarlane]

In a Lua filter you could probably just use pandoc.read with the format "bibtex" or "biblatex".


> On Jan 30, 2023, at 9:21 AM, Bastien DUMONT <bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org> wrote:
> 
> Do you mean a function that parses the .bib file directly? I really think that it would be easier to convert the .bib file to a CSL JSON file and import it via a JSON parser.
> 
> Le Monday 30 January 2023 à 08:49:36AM, Bernardo C. D. A. Vasconcelos a écrit :
>> Thanks for the feedback, Bastien! 
>> Can you think of a similar example script that contains the function to parse
>> the bib data? I searched for it online to no avail.
>> On Saturday, January 28, 2023 at 7:35:40 PM UTC-3 Bastien Dumont wrote:
>> 
>>    I think that it would be better to run it before citeproc, since you don't
>>    want citeproc output (unless you want to still benefit from the "ibid./
>>    cited" feature). Citeproc would not help you so much here because it does
>>    not tag the different parts of a formatted citation. On the other hand,
>>    parsing the bib file would be rather simple if it is in the CSL JSON
>>    format: then you would just have to use one of the JSON modules for Lua to
>>    import your bibliographic references into a Lua table. If you use Bib(La)
>>    TeX, you can convert a .bib file to a .json with `pandoc -f bibtex (or
>>    biblatex) -t csljson myfile.bib -o myfile.json`.
>> 
>>    Le Saturday 28 January 2023 à 02:07:54PM, Bernardo C. D. A. Vasconcelos a
>>    écrit :
>>> An HTML equivalent of these commands was proposed in Github, but there
>>    was no
>>> feasible way for it to be implemented as part of Citeproc. I suggested a
>>    Lua
>>> filter to achieve this and John said it sounded doable. 
>>> 
>>> I learned some Lua and experimented, but I didn't come close enough to
>>    have
>>> something worth sharing. In short: I imagined something like `[@Ref]
>>> {.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: parsing the
>>    bib
>>> data and saving it to a Lua table (stuck here); filtering spans; checking
>>    the
>>> type and performing the replacement (not clear to me either what the
>>    correct
>>> way would be to replace the id with the data or if this would have to run
>>> before/after citeproc).
>>> 
>>> Any pointers would be much appreciated.
>>> 
>>> --
>>> You received this message because you are subscribed to the Google Groups
>>> "pandoc-discuss" group.
>>> To unsubscribe from this group and stop receiving emails from it, send an
>>    email
>>> to [1]pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>>> To view this discussion on the web visit [2][1]https://groups.google.com/
>>    d/msgid/
>>> pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%[2]
>>    40googlegroups.com.
>>> 
>>> References:
>>> 
>>> [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>>> [2] [3]https://groups.google.com/d/msgid/pandoc-discuss/
>>    51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&
>>    utm_source=footer
>> 
>> 
>> --
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>> "pandoc-discuss" group.
>> To unsubscribe from this group and stop receiving emails from it, send an email
>> to [4]pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
>> To view this discussion on the web visit [5]https://groups.google.com/d/msgid/
>> pandoc-discuss/4865a325-42c0-4245-b992-b4fbdeab576en%40googlegroups.com.
>> 
>> References:
>> 
>> [1] https://groups.google.com/d/msgid/
>> [2] http://40googlegroups.com/
>> [3] https://groups.google.com/d/msgid/pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%40googlegroups.com?utm_medium=email&utm_source=footer
>> [4] mailto:pandoc-discuss+unsubscribe-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
>> [5] https://groups.google.com/d/msgid/pandoc-discuss/4865a325-42c0-4245-b992-b4fbdeab576en%40googlegroups.com?utm_medium=email&utm_source=footer
> 
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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bernardo C. D. A. Vasconcelos]

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A filter that seems close enough is the bibexport filter at 
https://raw.githubusercontent.com/pandoc/lua-filters/master/bibexport/bibexport.lua 
which I reproduce below:

```
local utils = require 'pandoc.utils'
local List = require 'pandoc.List'

local citation_id_set = {}

local type = utils.type or type

-- Collect all citation IDs.
function Cite (c)
  local cs = c.citations
  for i = 1, #cs do
    citation_id_set[cs[i].id or cs[i].citationId] = true
  end
end

--- Return a list of citation IDs
function citation_ids ()
  local citations = {};
  for cid, _ in pairs(citation_id_set) do
    citations[#citations + 1] = cid
  end
  return citations
end

--- stringify meta inline elements. Pandoc prior to version 2.8
-- didn't properly tag MetaInline values, so making it necessary to use an
-- auxiliary Span.
local stringifyMetaInlines = function (el)
  return el.t
    and utils.stringify(el)
    or utils.stringify(pandoc.Span(el))
end

function bibdata (bibliography)
  function bibname (bibitem)
    return type(bibitem) == 'string'
      and bibitem:gsub('%.bib$', '')
      -- bibitem is assumed to be a list of inlines or MetaInlines element
      or stringifyMetaInlines(bibitem):gsub('%.bib$', '')
  end

  local bibs = (type(bibliography) == 'List' or bibliography.t == 
'MetaList')
    and List.map(bibliography, bibname)
    or {bibname(bibliography)}
  return table.concat(bibs, ',')
end

function aux_content(bibliography)
  local cites = citation_ids()
  table.sort(cites)
  local citations = table.concat(cites, ',')
  return table.concat(
    {
      '\\bibstyle{alpha}',
      '\\bibdata{' .. bibdata(bibliography) .. '}',
      '\\citation{' .. citations .. '}',
      '',
    },
    '\n'
  )
end

function write_dummy_aux (bibliography, auxfile)
  local filename
  if type(auxfile) == 'string' then
    filename = auxfile
  elseif type(auxfile) == 'table' or type(auxfile) == 'Inlines' then
    -- assume list of inlines
    filename = utils.stringify(pandoc.Span(auxfile))
  else
    filename = 'bibexport.aux'
  end
  local fh = io.open(filename, 'w')
  fh:write(aux_content(bibliography))
  fh:close()
  io.stdout:write('Aux written to ' .. filename .. '\n')
  return filename
end

function Pandoc (doc)
  local meta = doc.meta
  if not meta.bibliography then
    return nil
  else
    -- create a dummy .aux file
    local auxfile_name = write_dummy_aux(meta.bibliography, meta.auxfile)
    os.execute('bibexport ' .. auxfile_name)
    io.stdout:write('Output written to bibexport.bib\n')
    return nil
  end
end
```

We already have something that will collect the whole bibliography. How do 
we go from this to actually using this to replace Cites with special 
attributes? E.g. [@Citekey]{.title} or with a suffix [@Citekey-]? This last 
one (the suffix) I was able to dig down until I could locate it in the 
Pandoc AST using Paru for Ruby, but not using Lua. (At first, I thought Lua 
would be easier, but the underlying Haskell architecture and the AST model 
are still very foreign to me.)

Thanks,
B.

On Monday, January 30, 2023 at 2:41:35 PM UTC-3 John MacFarlane wrote:

> In a Lua filter you could probably just use pandoc.read with the format 
> "bibtex" or "biblatex".
>
>
> > On Jan 30, 2023, at 9:21 AM, Bastien DUMONT <bastien...-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org> 
> wrote:
> > 
> > Do you mean a function that parses the .bib file directly? I really 
> think that it would be easier to convert the .bib file to a CSL JSON file 
> and import it via a JSON parser.
> > 
> > Le Monday 30 January 2023 à 08:49:36AM, Bernardo C. D. A. Vasconcelos a 
> écrit :
> >> Thanks for the feedback, Bastien! 
> >> Can you think of a similar example script that contains the function to 
> parse
> >> the bib data? I searched for it online to no avail.
> >> On Saturday, January 28, 2023 at 7:35:40 PM UTC-3 Bastien Dumont wrote:
> >> 
> >> I think that it would be better to run it before citeproc, since you 
> don't
> >> want citeproc output (unless you want to still benefit from the "ibid./
> >> cited" feature). Citeproc would not help you so much here because it 
> does
> >> not tag the different parts of a formatted citation. On the other hand,
> >> parsing the bib file would be rather simple if it is in the CSL JSON
> >> format: then you would just have to use one of the JSON modules for Lua 
> to
> >> import your bibliographic references into a Lua table. If you use 
> Bib(La)
> >> TeX, you can convert a .bib file to a .json with `pandoc -f bibtex (or
> >> biblatex) -t csljson myfile.bib -o myfile.json`.
> >> 
> >> Le Saturday 28 January 2023 à 02:07:54PM, Bernardo C. D. A. Vasconcelos 
> a
> >> écrit :
> >>> An HTML equivalent of these commands was proposed in Github, but there
> >> was no
> >>> feasible way for it to be implemented as part of Citeproc. I suggested 
> a
> >> Lua
> >>> filter to achieve this and John said it sounded doable. 
> >>> 
> >>> I learned some Lua and experimented, but I didn't come close enough to
> >> have
> >>> something worth sharing. In short: I imagined something like `[@Ref]
> >>> {.citetitle}` and `[@Ref]{.citeauthor}`. So this would imply: parsing 
> the
> >> bib
> >>> data and saving it to a Lua table (stuck here); filtering spans; 
> checking
> >> the
> >>> type and performing the replacement (not clear to me either what the
> >> correct
> >>> way would be to replace the id with the data or if this would have to 
> run
> >>> before/after citeproc).
> >>> 
> >>> Any pointers would be much appreciated.
> >>> 
> >>> --
> >>> You received this message because you are subscribed to the Google 
> Groups
> >>> "pandoc-discuss" group.
> >>> To unsubscribe from this group and stop receiving emails from it, send 
> an
> >> email
> >>> to [1]pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> >>> To view this discussion on the web visit [2][1]
> https://groups.google.com/
> >> d/msgid/
> >>> pandoc-discuss/51e71797-b029-4438-be64-6a8a15dd500an%[2]
> >> 40googlegroups.com.
> >>> 
> >>> References:
> >>> 
> >>> [1] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
> >>> [2] [3]https://groups.google.com/d/msgid/pandoc-discuss/
> >> 51e71797-b029-4438-be64-6a8a15dd500an%
> 40googlegroups.com?utm_medium=email&
> >> utm_source=footer
> >> 
> >> 
> >> --
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> Groups
> >> "pandoc-discuss" group.
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> an email
> >> to [4]pandoc-discus...-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org
> >> To view this discussion on the web visit [5]
> https://groups.google.com/d/msgid/
> >> pandoc-discuss/4865a325-42c0-4245-b992-b4fbdeab576en%40googlegroups.com
> .
> >> 
> >> References:
> >> 
> >> [1] https://groups.google.com/d/msgid/
> >> [2] http://40googlegroups.com/
> >> [3] 
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> >> [4] mailto:pandoc-discus...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org
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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Albert Krewinkel]

"Bernardo C. D. A. Vasconcelos" <bernardovasconcelos-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> A filter that seems close enough is the bibexport filter at https://
> raw.githubusercontent.com/pandoc/lua-filters/master/bibexport/
> bibexport.lua which I reproduce below:

Newer pandoc versions allow to shorten this to

```
function Pandoc (doc)
  doc.meta.references = pandoc.utils.references(doc)
  doc.meta.bibliography = nil
  return doc
end
```

Here's a "quick n' dirty" filter that should make your `[@key]{.title}`
syntax work:

```
function Pandoc (doc)
  doc.meta.references = pandoc.utils.references(doc)
  doc.meta.bibliography = nil
  return doc:walk{
    Span = function (span)
      -- check that the span contains only a single cite object
      local cite = span.content[1]
      local citations = cite and cite.citations or nil
      if #span.content == 1 and cite.t == 'Cite' and #citations == 1 then
        local cite_id = citations[1].id
        local ref = doc.meta.references:find_if(
          function (r) return cite_id == r.id end
        )
        if ref and span.classes[1] then
          -- replace the span with a specific citation field
          return ref[span.classes[1]]
        end
      end
    end
  }
end
```

It's a bit condensed and not well documented, so let me know if you have
questions.


-- 
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124

Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bernardo C. D. A. Vasconcelos]

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Albert,
that is vexingly short, but the syntax is perfectly clear. Thank you! Since 
I toiled at this for a while, your filter will provide me with some 
interesting learning opportunities. I will play around with it and see how 
it behaves with the other Lua filters.
Thanks again,
B.

On Thursday, March 9, 2023 at 9:44:30 AM UTC-3 Albert Krewinkel wrote:

>
> "Bernardo C. D. A. Vasconcelos" <bernardov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:
>
> > A filter that seems close enough is the bibexport filter at https://
> > raw.githubusercontent.com/pandoc/lua-filters/master/bibexport/
> > bibexport.lua which I reproduce below:
>
> Newer pandoc versions allow to shorten this to
>
> ```
> function Pandoc (doc)
> doc.meta.references = pandoc.utils.references(doc)
> doc.meta.bibliography = nil
> return doc
> end
> ```
>
> Here's a "quick n' dirty" filter that should make your `[@key]{.title}`
> syntax work:
>
> ```
> function Pandoc (doc)
> doc.meta.references = pandoc.utils.references(doc)
> doc.meta.bibliography = nil
> return doc:walk{
> Span = function (span)
> -- check that the span contains only a single cite object
> local cite = span.content[1]
> local citations = cite and cite.citations or nil
> if #span.content == 1 and cite.t == 'Cite' and #citations == 1 then
> local cite_id = citations[1].id
> local ref = doc.meta.references:find_if(
> function (r) return cite_id == r.id end
> )
> if ref and span.classes[1] then
> -- replace the span with a specific citation field
> return ref[span.classes[1]]
> end
> end
> end
> }
> end
> ```
>
> It's a bit condensed and not well documented, so let me know if you have
> questions.
>
>
> -- 
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
>

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Re: Lua Filter for \citeauthor and \citetitle in HTML

[Bernardo C. D. A. Vasconcelos]

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It works wonderfully. I made some minor modifications to allow it to work more like a `citefield` filter in general, and to avoid an error due to invalid field names passed as args. I think we could call it ready unless anyone else has suggestions. For fields with names such as authors, editors and translators, it seemed enough to get the family name of the first name, but other could prefer it to behave differently, of course.


```
local function get_keys(t)
  local keys={}
  for key,_ in pairs(t) do
    table.insert(keys, key)
  end
  return keys
end

stringify = require 'pandoc.utils'.stringify

function Pandoc (doc)
  doc.meta.references = pandoc.utils.references(doc)
  doc.meta.bibliography = nil
  return doc:walk{
    Span = function (span)
      -- check that the span contains only a single cite object
      local cite = span.content[1]
      local citations = cite and cite.citations or nil
      if #span.content == 1 and cite.t == 'Cite' and #citations == 1 then
        local cite_id = citations[1].id
        local ref = doc.meta.references:find_if(
          function (r) return cite_id == r.id end
        )
        local the_arg = span.classes[1]
        local the_result = ""
        if ref and the_arg then
          if string.find(stringify(get_keys(ref)), the_arg) then
          -- replace the span with a specific citation field
            if the_arg == "author" or the_arg == "editor" or the_arg == "translator" then
              the_result = stringify(ref[the_arg][1]["family"])
            else if the_arg == "title" then
                the_result = pandoc.Emph{stringify(ref[the_arg])}
              else
                the_result = stringify(ref[the_arg])
              end
            end
          else
          -- return the span unchanged
          the_result = span
          end
          return the_result
        end
      end
    end
  }
end
```

Um abraço,
Bernardo

From: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> on behalf of Bernardo C. D. A. Vasconcelos <bernardovasconcelos-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Date: Thursday, 9 March 2023 11:37
To: pandoc-discuss <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: Re: Lua Filter for citeauthor and citetitle in HTML
Albert,
that is vexingly short, but the syntax is perfectly clear. Thank you! Since I toiled at this for a while, your filter will provide me with some interesting learning opportunities. I will play around with it and see how it behaves with the other Lua filters.
Thanks again,
B.

On Thursday, March 9, 2023 at 9:44:30 AM UTC-3 Albert Krewinkel wrote:

"Bernardo C. D. A. Vasconcelos" <bernardov...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> writes:

> A filter that seems close enough is the bibexport filter at https://
> raw.githubusercontent.com/pandoc/lua-filters/master/bibexport/<http://raw.githubusercontent.com/pandoc/lua-filters/master/bibexport/>
> bibexport.lua which I reproduce below:

Newer pandoc versions allow to shorten this to

```
function Pandoc (doc)
doc.meta.references = pandoc.utils.references(doc)
doc.meta.bibliography = nil
return doc
end
```

Here's a "quick n' dirty" filter that should make your `[@key]{.title}`
syntax work:

```
function Pandoc (doc)
doc.meta.references = pandoc.utils.references(doc)
doc.meta.bibliography = nil
return doc:walk{
Span = function (span)
-- check that the span contains only a single cite object
local cite = span.content[1]
local citations = cite and cite.citations or nil
if #span.content == 1 and cite.t == 'Cite' and #citations == 1 then
local cite_id = citations[1].id
local ref = doc.meta.references:find_if(
function (r) return cite_id == r.id<http://r.id> end
)
if ref and span.classes[1] then
-- replace the span with a specific citation field
return ref[span.classes[1]]
end
end
end
}
end
```

It's a bit condensed and not well documented, so let me know if you have
questions.


--
Albert Krewinkel
GPG: 8eed e3e2 e8c5 6f18 81fe e836 388d c0b2 1f63 1124
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