Re: Lua filter to fix incorrectly nested lists?

[JDTS <jdtsmith-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Thanks, I'll investigate this.  The HTML structure is generated and 
therefore quite uniform, so it may be possible to do the munging there. 
On Sunday, February 26, 2023 at 10:47:36 AM UTC-5 Julien Dutant wrote:

> From my labelled-lists filter (
> https://github.com/dialoa/dialectica-filters/blob/main/labelled-lists/labelled-lists.lua), 
> here is a filter + function that checks whether every item in a bullet list 
> starts with a Span element. 
>
> ```lua 
>
> --- is_custom_labelled_list: Look for custom labels markup 
> -- Custom label markup requires each item starting with a span 
> -- containing the label 
> -- @param element pandoc BulletList element 
> function is_custom_labelled_list (element) 
>    local is_cl_list = true 
>
>    -- the content of BulletList is a List of List of Blocks 
>    for _,blocks in ipairs(element.c) do 
>       -- check that the first element of the first block is Span 
>       if not( blocks[1].c[1].t == 'Span' ) then 
>          is_cl_list = false  
>          break   
>      end 
>     end 
>    return is_cl_list 
>
> end
>
> return {{ 
> BulletList = function(element) 
> if is_custom_labelled_list(element) then 
> return pandoc.Para(pandoc.Str('Was a list of the required kind!)))
> end 
> end, }}
>
> ```
>
> The difficulty with manipulating lists is to follow their intricate 
> structure: a BulletList element as a content (element.c) that is a pandoc 
> List. Each item in it (element.c[1], element.c[2]) is of Blocks type, i.e. 
> a pandoc.List where the each element is a block. In your case you should 
> check that the list item only contains one block of type ordered list:
>
> if #elem.c[i] == 1 then list_item_contains_one_block_only = true end
>
> and check that this block is of type OrderedList:
> if #elem.c[i]==1 and elem.c[i].t == 'OrderedList' then ...
>
> you should then add that block to the previous item, and remove the 
> current item.
>
> Hope this helps,
>
> J
>
> On Saturday, February 25, 2023 at 10:06:45 PM UTC JDTS wrote:
>
>> Thanks.  Any pointers to lua filters that do something similar?
>>
>> On Saturday, February 25, 2023 at 10:01:08 AM UTC-5 Julien Dutant wrote:
>>
>>> Looks feasible. Pandoc converts the first html to:
>>>
>>> [ BulletList
>>>     [ [ Plain
>>>           [ ... Inlines ]
>>>       ]
>>>     , [ BulletList
>>>           [ [ Plain
>>>                 [ ... Inlines ]
>>>             ]
>>>           , [ Plain
>>>                 [ ... Inlines  ]
>>>             ]
>>>           ]
>>>       ]
>>>     , [ Plain
>>>           [ Inlines ]
>>>       ]
>>>     ]
>>> ]
>>>
>>> I.e., the sublist is converted to its own list item. So the filter 
>>> should pick up list, check if any item within them consists of a lone 
>>> sublist, and if so, move it to the previous item. (And best, apply the 
>>> filter recursively to that sublist itself.)
>>>
>>> On Saturday, February 25, 2023 at 2:26:04 PM UTC JDTS wrote:
>>>
>>>> The Apple Notes app produces (via AppleScript) HTML for notes with 
>>>> nested lists structured like:
>>>>
>>>> <ul>
>>>>
>>>> <li>Level 1 element 1</li>
>>>>
>>>> <ul>
>>>>
>>>> <li>Level 2 element 1</li>
>>>>
>>>> <li>Level 2 element 2</li>
>>>>
>>>> </ul>
>>>>
>>>> <li>Level 1 element 2</li>
>>>>
>>>> </ul>
>>>>
>>>> As you can see, the sublist is incorrectly positioned.  It should be 
>>>> positioned *within* the <li> Level 1 element 1 item, ala:
>>>>
>>>> <ul>
>>>>
>>>> <li>Level 1 element 1
>>>>
>>>>     <ul>
>>>>
>>>>     <li>Level 2 element 1</li>
>>>>
>>>>     <li>Level 2 element 2</li>
>>>>
>>>>     </ul>
>>>>
>>>> </li>
>>>>
>>>> <li>Level 1 element 2</li>
>>>>
>>>> </ul>
>>>>
>>>> Is there a straightforward way with Lua filters to fix this at the AST 
>>>> level, for arbitrary-depth sublist nesting?
>>>>
>>>

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