manipulating headline level

manipulating headline level

['juh' via pandoc-discuss]

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Dear all,

I this use-case:

Many markdown-files hierarchically ordered in folders.
Every file starts with the top-level headline mark "#".

I want to convert these files like this:

pandoc $(cat outline.txt) -o target.html

where outline.txt contains the relative pathes to all files.


00.md
01/00.md
01/01/00.md 
01/01/01.md 
01/01/02.md 

Is there a way to tell pandoc that it should regard the headline levels
according to the folder structure?

So that the first headline in 01/01/00.md is regarded as '###' not as
'#'?

Or shall I go an other way and write a prebuild script that converts the headline
level in these files according to their position in the folder
hierarchy?

Any hints?
juh

-- 
Autoren-Homepage: ......... http://literatur.hasecke.com
Satiren & Essays: ......... http://www.sudelbuch.de
Privater Blog: ............ http://www.hasecke.eu
Netzliteratur-Projekt: .... http://www.generationenprojekt.de

Re: manipulating headline level

[Albert Krewinkel]

Dear juh,

"'juh' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> writes:

> Many markdown-files hierarchically ordered in folders.
> Every file starts with the top-level headline mark "#".
>
> I want to convert these files like this:
>
> pandoc $(cat outline.txt) -o target.html
>
> where outline.txt contains the relative pathes to all files.
>
>
> 00.md
> 01/00.md
> 01/01/00.md 
> 01/01/01.md 
> 01/01/02.md 
>
> Is there a way to tell pandoc that it should regard the headline levels
> according to the folder structure?

Pandoc can't do this out of the box, but you could use a custom reader
to correct the headings. The below requires the current dev version
(nightly build), but could be rewritten to work with a released version,
too.

The script

 - iterates over all input files,
 - parses their contents as a separate document,
 - shifts headers in each document by the number of subdirs the
   respective file is in, and
 - concatenates the individual per-file documents into a single
   document that is then returned.

Pass the reader file to pandoc via the `--from` parameter.

``` lua
local format = 'markdown+smart'

function Reader (sources, opts)
  local doc = pandoc.Pandoc{}
  for _, source in ipairs(sources) do
    local path_components = #pandoc.path.split(source.name)
    -- last path component is the filename
    local depth = path_components - 1
    doc = doc .. pandoc.read(source, format, opts):walk {
      Header = function (h)
        h.level = h.level + depth
        return h
      end
    }
  end
  return doc
end
```

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

Re: manipulating headline level

[BPJ]

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Super cool!

Den ons 29 juni 2022 14:25Albert Krewinkel <albert+pandoc-9EawChwDxG8hFhg+JK9F0w@public.gmane.org>
skrev:

> Dear juh,
>
> "'juh' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> writes:
>
> > Many markdown-files hierarchically ordered in folders.
> > Every file starts with the top-level headline mark "#".
> >
> > I want to convert these files like this:
> >
> > pandoc $(cat outline.txt) -o target.html
> >
> > where outline.txt contains the relative pathes to all files.
> >
> >
> > 00.md
> > 01/00.md
> > 01/01/00.md
> > 01/01/01.md
> > 01/01/02.md
> >
> > Is there a way to tell pandoc that it should regard the headline levels
> > according to the folder structure?
>
> Pandoc can't do this out of the box, but you could use a custom reader
> to correct the headings. The below requires the current dev version
> (nightly build), but could be rewritten to work with a released version,
> too.
>
> The script
>
>  - iterates over all input files,
>  - parses their contents as a separate document,
>  - shifts headers in each document by the number of subdirs the
>    respective file is in, and
>  - concatenates the individual per-file documents into a single
>    document that is then returned.
>
> Pass the reader file to pandoc via the `--from` parameter.
>
> ``` lua
> local format = 'markdown+smart'
>
> function Reader (sources, opts)
>   local doc = pandoc.Pandoc{}
>   for _, source in ipairs(sources) do
>     local path_components = #pandoc.path.split(source.name)
>     -- last path component is the filename
>     local depth = path_components - 1
>     doc = doc .. pandoc.read(source, format, opts):walk {
>       Header = function (h)
>         h.level = h.level + depth
>         return h
>       end
>     }
>   end
>   return doc
> end
> ```
>
> --
> Albert Krewinkel
> GPG: 8eed e3e2 e8c5 6f18 81fe  e836 388d c0b2 1f63 1124
>
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> .
>

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Re: manipulating headline level

['juh' via pandoc-discuss]

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Dear Albert,

Am Wed, Jun 29, 2022 at 06:18:31PM +0200 schrieb BPJ:
 > Super cool!

yes indeed. Tremendously neat. 
This looks exactly what I need, but I don't use the dev
version of pandoc.

So when I call it like this:

pandoc -f script.lua -o test.html 00.md 01/00.md ...

I get:

Error running Lua:
input.lua:9: attempt to concatenate a Pandoc value (local 'doc')
stack traceback:

Is there a timeline for the dev version to become stable?

I can't adapt the script to be used with current stable.

TIA
juh

-- 
Autoren-Homepage: ......... http://literatur.hasecke.com
Satiren & Essays: ......... http://www.sudelbuch.de
Privater Blog: ............ http://www.hasecke.eu
Netzliteratur-Projekt: .... http://www.generationenprojekt.de

Re: manipulating headline level

[Albert Krewinkel]

"'juh' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> writes:

> [...] I don't use the dev version of pandoc.
>
> So when I call it like this:
>
> pandoc -f script.lua -o test.html 00.md 01/00.md ...
>
> I get:
>
> Error running Lua:
> input.lua:9: attempt to concatenate a Pandoc value (local 'doc')
> stack traceback:

Here's a polyfill for the missing feature. Adding it before or after
the other code should make the reader work with pandoc 2.18.

``` lua
if PANDOC_VERSION <= {2, 18} then
  local mt = debug.getmetatable(pandoc.Pandoc{})
  mt.__concat = function (a, b)
    local result = pandoc.Pandoc(a.blocks, a.meta)
    result.blocks:extend(b.blocks)
    for k, v in ipairs(b.meta) do
      result.meta[k] = v
    end
    return result
  end
end
```

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

Re: manipulating headline level

['Jan Ulrich Hasecke' via pandoc-discuss]

Thank you Albert,

it works.

Now I have to finetune the folder hierarchy.

juh

Re: manipulating headline level

['Jan Ulrich Hasecke' via pandoc-discuss]

One thing.

A metadata block in the first included file is not interpreted.

My workaround is to use a metadata file.

juh

Re: manipulating headline level

[Albert Krewinkel]

"'Jan Ulrich Hasecke' via pandoc-discuss" <pandoc-discuss-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org> writes:

> One thing.
>
> A metadata block in the first included file is not interpreted.

There was a typo in my code: `ipairs` should have been `pairs`.
Here's the fixed version:

``` lua
if PANDOC_VERSION <= {2, 18} then
  local mt = debug.getmetatable(pandoc.Pandoc{})
  mt.__concat = function (a, b)
    local result = pandoc.Pandoc(a.blocks, a.meta)
    result.blocks:extend(b.blocks)
    for k, v in pairs(b.meta) do
      result.meta[k] = v
    end
    return result
  end
end
```


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