Re: How do I replace a string in all text that pandoc converts, i.e. how do I do this with a filter?

[- <paulschillinger93-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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OK, so I have markdown text that includes ==highlighted== words like that. 
I would like to convert ==highlighting== either to \hl{highlighting} so 
LaTeX can handle it, or to highlighting, i.e. remove the symbols, so that 
they just don't appear.

Thanks to you, I now have a working filter that looks like this:

return {
  {
    Str = function (elem)
      if elem.text == "highlighting" then
        return pandoc.Emph {pandoc.Str "highlighting"}
      else
        return elem
      end
    end,
  }
}

This filter takes all instances of highlighting and turns them into 
*highlighting*. However, ONLY if that's a whole word. If it's 
==highlighting== it doesn't touch it because that's seemingly technically 
another word as it contains other characters. In my case I would like to 
replace only the "==" but since they're attached to other characters, i.e. 
the actual word, the filter doesn't touch them.

That's where I'm at right now. I'm now looking for a modification of that 
filter so it also applies to parts of a word.
Any ideas on that?

Thanks!

On Tuesday, December 6, 2022 at 11:00:09 a.m. UTC+1 denis...-NSENcxR/0n0@public.gmane.org wrote:

> Sorry, I haven’t been following from the beginning. Can you provide a 
> complete example. What’s your input ? What’s the desired output ?
>
>  
>
> *Von:* pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> *Im 
> Auftrag von *paulschi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
> *Gesendet:* Dienstag, 6. Dezember 2022 01:03
> *An:* pandoc-discuss <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
> *Betreff:* Re: How do I replace a string in all text that pandoc 
> converts, i.e. how do I do this with a filter?
>
>  
>
> I've narrowed it down! The issue isn't the characters but that they're 
> technically "part" of the word. How do I replace PART of a word?
>
> Thanks!
>
>  
>
> On Tuesday, December 6, 2022 at 12:52:05 a.m. UTC+1 - wrote:
>
> Barring that, can't I use something like "> = string.gsub("Hello banana", 
> "banana", "Lua user")", if so how would I do that? I got that example from 
> http://lua-users.org/wiki/StringLibraryTutorial
>
> On Tuesday, December 6, 2022 at 12:51:09 a.m. UTC+1 - wrote:
>
> I just tried that, thanks! That works :) But this doesn't appear to work 
> for characters, like "==" which was the original goal. Am I missing some 
> sort of escape characters?
>
> On Tuesday, December 6, 2022 at 12:49:46 a.m. UTC+1 denis...-NSENcxR/0n0@public.gmane.org 
> wrote:
>
> You are matching against the whole paragraph (para). So, when the first 
> element in your paragraph matches your search string, you'll replace the 
> whole paragraph with the return value of your function. (Which is a block 
> element, not an inline element.) 
>
> Use the example from here instead: 
> https://pandoc.org/lua-filters.html#macro-substitution 
> ________________________________________ 
> Von: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> im Auftrag 
> von paulschi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org <paulschi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 
> Gesendet: Dienstag, 6. Dezember 2022 00:32:23 
> An: pandoc-discuss 
> Betreff: Re: How do I replace a string in all text that pandoc converts, 
> i.e. how do I do this with a filter? 
>
> YES! that works! But can you tell me why it replaces the whole line? Can't 
> I do this in running text? 
> Thanks! 
> return { 
> { 
> Para = function (elem) 
> if elem.content[1].text == "{{helloworld}}" then 
> return pandoc.RawBlock('latex','abc') 
> else 
> return elem 
> end 
> end, 
> } 
> } 
>
>
>
>
> On Tuesday, December 6, 2022 at 12:09:13 a.m. UTC+1 denis...-NSENcxR/0n0@public.gmane.org 
> wrote: 
> Just your example filter: 
>
> ```lua 
> return { 
> { 
> Para = function (elem) 
> if elem.content[1].text == "{{helloworld}}" then 
> return pandoc.RawBlock('html','<div>abc</div>') 
> else 
> return elem 
> end 
> end, 
> } 
> } 
> ``` 
>
> The problematic line is this: return 
> pandoc.RawBlock('html','<div>abc</div>') 
> This adds a raw block that will only come in to effect when your output 
> format is html. 
>
> If your target ist latex, you’ll need something like this: return 
> pandoc.RawBlock('latex','\\whatever{abc}') 
>
> ```cmd 
> pandoc test.md -L filter.lua -t latex 
> asf 
>
> \whatever{abc} 
>
> asf 
> ``` 
>
>
> Von: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag 
> von paulschi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
> Gesendet: Dienstag, 6. Dezember 2022 00:04 
> An: pandoc-discuss <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> 
> Betreff: Re: How do I replace a string in all text that pandoc converts, 
> i.e. how do I do this with a filter? 
>
> No, my intended output is a PDF file. Does that change anything? Could you 
> tell me what exactly you put in filter.lua? 
> Thanks! 
>
> On Monday, December 5, 2022 at 11:56:39 p.m. UTC+1 denis...-NSENcxR/0n0@public.gmane.org 
> wrote: 
> What exactly are you doing? Your output format is html? I’ve just tested 
> this and it seems to work. 
>
> ```cmd 
> C:\Users\denis\Downloads\filter>cat test.md 
> asf 
>
> {{helloworld}} 
>
> asf 
> C:\Users\denis\Downloads\filter>pandoc test.md 
> <p>asf</p> 
> <p>{{helloworld}}</p> 
> <p>asf</p> 
>
> C:\Users\denis\Downloads\filter>pandoc test.md -L filter.lua 
> <p>asf</p> 
> <div>abc</div> 
> <p>asf</p> 
> ``` 
> Von: pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> Im Auftrag 
> von paulschi...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org 
> Gesendet: Montag, 5. Dezember 2022 18:58 
> An: pandoc-discuss <pandoc-...-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> 
> Betreff: Re: How do I replace a string in all text that pandoc converts, 
> i.e. how do I do this with a filter? 
>
> I've tried this: 
>
> return { 
> { 
> Para = function (elem) 
> if elem.content[1].text == "{{helloworld}}" then 
> return pandoc.RawBlock('html','<div>abc</div>') 
> else 
> return elem 
> end 
> end, 
> } 
> } 
>
> but that only gets rid of {{helloworld}}, it doesn't replace it with 
> anything. Sadly this doens't work for "==", i.e. those don't disappear. 
> On Monday, December 5, 2022 at 6:49:08 p.m. UTC+1 - wrote: 
> I've been trying to replace markdown/Obsidian highlights "==" either with 
> something that LaTeX can use e.g. \hl or just delete it/replace it with 
> nothing, but I can't figure out how to do this. 
>
> I've tried this: 
> function Str (str) 
> str.text = string.upper(str.text) 
> return str 
> end 
>
> But I can't even figure out where I'm meant to put my own text? 
>
> How do I rpelace == with " "? 
>
> Thanks! 
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