AW: Fw: Fixing lua filter to number paragraphs

[<denis.maier-NSENcxR/0n0@public.gmane.org>]

Or maybe the xcolor package.
________________________________________
Von: pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im Auftrag von Bastien DUMONT <bastien.dumont-VwIFZPTo/vqsTnJN9+BGXg@public.gmane.org>
Gesendet: Samstag, 24. September 2022 07:39:08
An: 'Mark Johnno' via pandoc-discuss
Betreff: Re: Fw: Fixing lua filter to number paragraphs

The error means that the command \color is not defined, i.e. the package that defines it is not loaded. It should be fixed by adding this after addTexPreamble("\\reversemarginpar"):

addTexPreamble("\\usepackage{\\color}")

Le Friday 23 September 2022 à 11:09:42PM, 'Mark Johnno' via pandoc-discuss a écrit :
> Hi, I have been using a lua filter for a few months with no issue, however, for the last few days, I've not been able to produce a PDF. I can't find hints online. I am hoping someone can help me.
>
> That is the error message I get:
>
> ! Undefined control sequence.
> <argument> ... \hspace {\z@ }\ignorespaces \color
>
> {lightgray}\tiny {[1]}\end...
> l.72 \paragraphnumber{[1]}
>
> I had some error messages in the past, usually due to missing squared brackets which I resolved by using --trace to check where parsing was slowing down (that is where the brackets were missing), but this time --trace does not provide any hints.
>
> I can convert the document from .md to .pdf (without the filter); that is the command I use:
>
> $ pandoc file.md --pdf-engine=xelatex -o file.pdf
>
> ...but when I add count-para.lua filter:
>
> $ pandoc file.md --pdf-engine=xelatex --lua-filter=count-para.lua -o file.pdf
>
> I get the error message mentioned above.
>
> I also tried with another document. I get the same error message.
>
> I tried contacting the author of the filter, in vain.
>
> Do you have a hint about how I could troubleshoot or fix this issue?
>
> Does the filter need to be updated?
>
> $ pandoc -v
> pandoc 2.5
> Compiled with pandoc-types 1.17.5.4, texmath 0.11.2.2, skylighting 0.7.7
>
> I use Trisquel GNU/Linux 10.0.1.
>
> This is the filter:
>
> --[[
> Make all 'regular' paragraphs into a div and assign a numeric ID
> Format this number in the margin
> Copyright © 2021 Michael Cysouw
> Permission to use, copy, modify, and/or distribute this software for any
> purpose with or without fee is hereby granted, provided that the above
> copyright notice and this permission notice appear in all copies.
> THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
> WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
> MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
> ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
> WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
> ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
> OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
> ]]
>
> local count = 0
> local chapter = 0
> local indexUserID = {}
>
> ------------------------------
> -- Options with default values
> ------------------------------
>
> local resetAtChapter = false
> local enclosing = "[]"
> local chapterSep = "."
> local refName = "paragraph "
> local addPageNr = true
>
> function getUserSettings (meta)
>
>   if meta.resetAtChapter ~= nil then
>     resetAtChapter = meta.resetAtChapter
>   end
>
>   if meta.enclosing ~= nil then
>     enclosing = pandoc.utils.stringify(meta.enclosing)
>   end
>
>   if meta.chapterSep ~= nil then
>     chapterSep = pandoc.utils.stringify(meta.chapterSep)
>   end
>
>   if meta.refName ~= nil then
>     refName = pandoc.utils.stringify(meta.refName)
>     if FORMAT:match "latex" then
>       if refName == "#" then refName = "\\#" end
>     end
>   end
>
>   if meta.addPageNr ~= nil then
>     addPageNr = meta.addPageNr
>   end
>
> end
>
> ------------------------
> -- Add global formatting
> ------------------------
>
> function addFormatting (meta)
>
>   local tmp = pandoc.MetaList{meta['header-includes']}
>   if meta['header-includes'] ~= nil then
>     tmp = meta['header-includes']
>   end
>
>   if FORMAT:match "html" then
>     local css = [[
> <!-- CSS added by lua-filter 'count-para' -->
> <style>
> .paragraph-number {
>   float: left;
>   margin-left: -5em;
>   width: 4.5em;
>   text-align: right;
>   color: grey;
>   font-size: x-small;
>   padding-top: 5px;
> }
> </style>
>     ]]
>     tmp[#tmp+1] = pandoc.MetaBlocks(pandoc.RawBlock("html", css))
>   end
>
>   function addTexPreamble (tex)
>     tmp[#tmp+1] = pandoc.MetaBlocks(pandoc.RawBlock("tex", tex))
>   end
>
>   if FORMAT:match "latex" then
>     addTexPreamble("\\usepackage{marginnote}")
>     addTexPreamble("\\reversemarginpar")
>     addTexPreamble("\\newcommand{\\paragraphnumber}[1]{\\marginnote{\\color{lightgray}\\tiny{#1}}[0pt]}")
>   end
>
>   meta['header-includes'] = tmp
>   return(meta)
> end
>
> -------------------------
> -- count Para and add Div
> -------------------------
>
> function countPara (doc)
>
>   for i=1,#doc.blocks do
>
>     -- optionally reset counter
>     if  doc.blocks[i].tag == "Header"
>         and doc.blocks[i].level == 1
>         and doc.blocks[i].classes[1] ~= "unnumbered"
>         and resetAtChapter
>     then
>         chapter = chapter + 1
>         count = 0
>     end
>
>     -- get Para, but not if there is an Image inside
>     if  doc.blocks[i].tag == "Para"
>         and doc.blocks[i].content[1].tag ~= "Image"
>     then
>
>       -- count paragraphs
>       count = count + 1
>       local ID = count
>       if resetAtChapter then
>         ID = chapter..chapterSep..count
>       end
>
>       -- format number to insert
>       local number = ID
>       if enclosing:len() == 1 then
>         number = enclosing..ID..enclosing
>       else
>         number = enclosing:sub(1,1)..ID..enclosing:sub(2,2)
>       end
>
>       -- check for user-inserted ids at the start of the paragraph
>       local firstElem = pandoc.utils.stringify(doc.blocks[i].content[1])
>       local userID = firstElem:match("{#(.*)}")
>       if userID ~= nil then
>         -- add to index
>         indexUserID[userID] = ID
>         -- remove reference from text
>         table.remove(doc.blocks[i].content, 1)
>         -- remove possible space
>         if doc.blocks[i].content[1].tag == "Space" then
>           table.remove(doc.blocks[i].content, 1)
>         end
>       end
>
>       -- insert number
>       if FORMAT:match "latex" then
>         -- use marginnote for formatting number in margin
>         local texCount = "\\paragraphnumber{"..number.."}"
>         if userID ~= nil then
>           -- add target for link to the number
>           texCount = "\\hypertarget{"..userID.."}{\n"..texCount.."\\label{"..userID.."}}"
>         end
>         table.insert(doc.blocks[i].content, 1, pandoc.RawInline("tex", texCount))
>       else
>         table.insert(doc.blocks[i].content, 1, pandoc.Space())
>         table.insert(doc.blocks[i].content, 1, pandoc.Span(number, pandoc.Attr(ID, {"paragraph-number"})))
>       end
>
>     end
>   end
>   return doc
> end
>
> ------------------------------
> -- set in-text cross-references
> ------------------------------
>
> function setCrossRefs (cite)
>
>   local userID = cite.citations[1].id
>   local paraID = indexUserID[userID]
>
>   -- ignore other "cite" elements
>   if paraID ~= nil then
>
>     -- make in-document cross-references
>     if FORMAT:match "latex" then
>
>       local texInsert = refName.."\\hyperlink{"..userID.."}{"..paraID.."}"
>       if addPageNr then
>         texInsert = texInsert.." on page~\\pageref{"..userID.."}"
>       end
>       return pandoc.RawInline("tex", texInsert)
>
>     else
>       return pandoc.Link(refName..paraID, "#"..paraID)
>     end
>
>   end
> end
>
> --------------------
> -- basic Pandoc loop
> --------------------
>
> return {
>   { Meta = addFormatting },
>   { Meta = getUserSettings },
>   { Pandoc = countPara },
>   { Cite = setCrossRefs }
> }
>
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