ignore section & content in output

ignore section & content in output

[Colin McLear]

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I would like to be able to put an id like {#ignore} next to any section 
title of arbitrary depth (i.e. h1, h2, etc) and have a lua filter that just 
removes that section for any output. I have a filter that accomplishes this 
for particular headings but for some reason (well, probably because I know 
very little lua) I can't make this work for heading and content. Any ideas 
are appreciated!

 

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Re: ignore section & content in output

[Albert Krewinkel]

Colin McLear writes:

> I would like to be able to put an id like {#ignore} next to any section
> title of arbitrary depth (i.e. h1, h2, etc) and have a lua filter that just
> removes that section for any output. I have a filter that accomplishes this
> for particular headings but for some reason (well, probably because I know
> very little lua) I can't make this work for heading and content. Any ideas
> are appreciated!

Maybe take a look at the abstract-to-meta filter in
<https://github.com/pandoc/lua-filters>. It does something quite
similar, in that it looks for a specific header and removes it
together with all its content from the document body. Only few
changes should be necessary to make it suitable for your
use-case.

Re: ignore section & content in output

[Colin McLear]

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That worked perfectly -- thanks!

On Saturday, February 9, 2019 at 4:40:19 PM UTC-5, Albert Krewinkel wrote:
>
> Colin McLear writes: 
>
> > I would like to be able to put an id like {#ignore} next to any section 
> > title of arbitrary depth (i.e. h1, h2, etc) and have a lua filter that 
> just 
> > removes that section for any output. I have a filter that accomplishes 
> this 
> > for particular headings but for some reason (well, probably because I 
> know 
> > very little lua) I can't make this work for heading and content. Any 
> ideas 
> > are appreciated! 
>
> Maybe take a look at the abstract-to-meta filter in 
> <https://github.com/pandoc/lua-filters>. It does something quite 
> similar, in that it looks for a specific header and removes it 
> together with all its content from the document body. Only few 
> changes should be necessary to make it suitable for your 
> use-case. 
>

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Re: ignore section & content in output

[Colin McLear]

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In case anyone is interested in such a filter:


-- cutsection.lua - remove tagged sections in Pandoc output
-- heavily adapted from 
https://github.com/pandoc/lua-filters/tree/master/abstract-to-meta

local looking_at_section = false
local remove = {}

function Block (elem)
  if looking_at_section then
    remove[#remove + 1] = elem
    return {}
  end
end

function Header (elem)
  if elem.identifier == 'remove' then
    looking_at_section = true
    return {}
  else
    looking_at_section = false
  end
end




On Saturday, February 9, 2019 at 1:55:15 PM UTC-5, Colin McLear wrote:
>
> I would like to be able to put an id like {#ignore} next to any section 
> title of arbitrary depth (i.e. h1, h2, etc) and have a lua filter that just 
> removes that section for any output. I have a filter that accomplishes this 
> for particular headings but for some reason (well, probably because I know 
> very little lua) I can't make this work for heading and content. Any ideas 
> are appreciated!
>
>  
>

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Re: ignore section & content in output

[EBkysko]

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Your filter looks good, except that any subsection of the "marked" section 
will remain present... but perhaps that's what you want.

If not, or if anyone else would like to remove all subsections of that 
section, the following seems to work:

local looking_at_section = false
local remove = {}
local lvl = 0

function Block (elem)
  if looking_at_section then
    remove[#remove + 1] = elem
    return {}
  end
end

function Header (elem)
  if elem.identifier == 'remove' then
    looking_at_section = true
    lvl = elem.level
    return {}
  else
    looking_at_section = looking_at_section and elem.level > lvl
    if looking_at_section then
      remove[#remove + 1] = elem
      return {}
    end
  end
end

The original filter has the same problem... but an abstract usually doesn't 
have subsections/sublevels (I think).

Note also that usually an identifier should identify only one element, and 
pandoc will (rightly) be annoyed when there's more than one header with the 
same ID.
A class would be ideal for this situation, and one might then use `if 
elem.classes:includes('remove',1)` rather than `if elem.identifier == 
'remove'`

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Re: ignore section & content in output

[Colin McLear]

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Even better - thanks very much!

On Monday, February 11, 2019 at 6:27:25 PM UTC-5, EBkysko wrote:
>
> Your filter looks good, except that any subsection of the "marked" section 
> will remain present... but perhaps that's what you want.
>
> If not, or if anyone else would like to remove all subsections of that 
> section, the following seems to work:
>
> local looking_at_section = false
> local remove = {}
> local lvl = 0
>
> function Block (elem)
>   if looking_at_section then
>     remove[#remove + 1] = elem
>     return {}
>   end
> end
>
> function Header (elem)
>   if elem.identifier == 'remove' then
>     looking_at_section = true
>     lvl = elem.level
>     return {}
>   else
>     looking_at_section = looking_at_section and elem.level > lvl
>     if looking_at_section then
>       remove[#remove + 1] = elem
>       return {}
>     end
>   end
> end
>
> The original filter has the same problem... but an abstract usually 
> doesn't have subsections/sublevels (I think).
>
> Note also that usually an identifier should identify only one element, and 
> pandoc will (rightly) be annoyed when there's more than one header with the 
> same ID.
> A class would be ideal for this situation, and one might then use `if 
> elem.classes:includes('remove',1)` rather than `if elem.identifier == 
> 'remove'`
>
>

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Re: ignore section & content in output

[EBkysko]

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One can simplify further I think[^1], removing a redundancy:

local looking_at_section = false
local lvl = 0
local remove = {}  -- delete line if 'remove' array not needed

function Block (elem)
  if elem.t == "Header" then
    -- if elem.classes:includes('remove',1) then
    if elem.identifier == 'remove' then
      looking_at_section = true
      lvl = elem.level
    else
      looking_at_section = looking_at_section and elem.level > lvl
    end
  end
  if looking_at_section then
    remove[#remove + 1] = elem  -- delete line if 'remove' array not needed
    return {}
  end
end

Note that in the original "abstract" script example, the removed portion 
was recreated as a meta section. If you don't intend to use the removed 
elements, you can simplify further (as noted) by removing the two lines 
related to the remove{} array.

[^1]: As long as the filter acts from top to bottom of document among the 
Blocks, i.e. if there's no unknown precedence rules among all the Block 
types... which I'm not 100% sure.

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Re: ignore section & content in output

[EBkysko]

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*Sigh* I don't know why formatting error appear (blank lines, new lines at 
wrong places) when I use google groups "code syntax" from the UI... and of 
course can't edit my dang post... So here's in raw form :

```
local looking_at_section = false
local lvl = 0
local remove = {}  -- delete line if 'remove' array not needed

function Block (elem)
  if elem.t == "Header" then
    -- if elem.classes:includes('remove',1) then
    if elem.identifier == 'remove' then
      looking_at_section = true
      lvl = elem.level
    else
      looking_at_section = looking_at_section and elem.level > lvl
    end
  end
  if looking_at_section then
    remove[#remove + 1] = elem  -- delete line if 'remove' array not needed
    return {}
  end
end
```

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