Re: Unable to center text in Markdown

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

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If you delimit the LaTeX commands you can put Markdown between them:

`\begin{center}`{=latex}Markdown *here*`\end{center}`{=latex}

or more realistically with raw blocks:

```{=latex}
\begin{center}
```

Some *Markdown* text goes here!

```{=latex}
\end{center}
```

Or you can use the attached filter (instructions inside!) and just type

:::center
Some *centered* text here
:::

which will allow your source to work for both HTML and LaTeX output.

Den tis 11 okt. 2022 22:15Richard Hu <richardyusen-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> skrev:

> Hi gnpan,
>
> Thanks! Your solution works, but I cannot put text formatted with Markdown
> between the \begin{center} ... \end{center} LaTeX tags.
> It seems like Pandoc understands the HTML (e.g. <h1> ... </h1>), but just
> refuses to acknowledge any alignment options specified.
>
>
> On Tue, Oct 11, 2022 at 7:27 PM gnpan <g.panayotou-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
>> Since you are converting to pdf, you could try some LaTeX, e.g.:
>> \begin{center}{Your text here}\end{center}
>>
>>
>> On Tuesday, 11 October 2022 at 17:39:03 UTC+3 richar...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:
>>
>>> Hello!
>>>
>>> I'm trying to center some text in my markdown document. I've tried:
>>> ```
>>> <p align="center"> Sample Text </p>
>>> <center> Sample Text </p>
>>> ```
>>> And used `pandoc test.md -o test.pdf` to compile my document. However,
>>> the text shows up as left-aligned and not centered.
>>>
>>> How may I resolve this issue?
>>>
>>> Thank you.
>>>
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--[==============================[
# `center-latex.lua`

A pandoc filter which turns Markdown like this

    :::center
    Some *Markdown* text goes here!
    :::

into LaTeX like this

    \begin{center}

    Some \emph{Markdown} text goes here!

    \end{center}

by saying on the command line

    pandoc -L center-latex.lua my-doc.md -so my-doc.ltx

or

    pandoc -L center-latex.lua my-doc.md -o my-doc.pdf

## Rationale

This is useful e.g. if you want to generate both LaTeX/PDF and HTML from
the same source, or just want to type less and have clean-looking source.

# Installation

Place the file `center-latex.lua` in the `filters` subdirectory/folder
of your Pandoc user directory. To see where the user directory goes inspect
the output of `pandoc --version`. This is typically

    $HOME/.local/share/pandoc/filters 

on Linux and MacOS and

    C:\Users\USERNAME\AppData\Roaming\pandoc\filters

on Windows. You may need to create these directories first.
On Linux/MacOS:

    mkdir -p ~/.local/share/pandoc/filters

and on Windows typically

    md C:\Users\USERNAME\AppData\Roaming\pandoc\filters

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

if 'latex' == FORMAT then
  -- Define once, use many times
  local begin_center = pandoc.RawBlock('latex', '\\begin{center}')
  local end_center = pandoc.RawBlock('latex', '\\end{center}')
  
  -- This is a "global"/non-local function
  function Div(div)
    -- Does the div have a class .center?
    if div.classes:includes('center') then
      -- We return just the content of the div
      local rv = div.content
      rv:insert(1, begin_center)  -- prepend
      rv:insert(end_center)       -- append
      return rv
    end
    -- else if no .center class do nothing
    return nil
  end
else
  -- Minimal no-op function so the filter isn't "empty"
  function Pandoc() return nil end
end

--[==============================[
## Copyright and license

This software is Copyright (c) 2022 by Benct Philip Jonsson.

This is free software, licensed under:

  The MIT (X11) License

http://www.opensource.org/licenses/mit-license.php
--]==============================]