Re: Lua filter to fix incorrectly nested lists?

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

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This works perfectly (including in targeting org, my use case).  Thanks so 
much!

On Monday, February 27, 2023 at 3:11:13 PM UTC-5 Julien Dutant wrote:

> Well, couldn't help but give it a shot. Here's a short filter that does 
> the trick. Will work at arbitrary depth.
>
> https://gist.github.com/jdutant/549ef06074d3ae00b78ca6ec8ed2cfe1
>
>
> function fixList(elem) 
> local changed = false 
> local newList = pandoc.List:new() 
>
> local function isSubList(list) 
> return #list == 1 
> and (list[1].t == 'BulletList' or list[1].t == 'OrderedList') 
> end 
>
> for _,item in ipairs(elem.c) do 
>
> if #newList > 0 and isSubList(item) then 
> -- append item's sublist to the last item of newList 
> changed = true 
> newList[#newList]:insert(item[1]) 
> else 
> -- otherwise append item to newList 
> newList:insert(item) 
> end 
>
> end 
>
> if changed then 
> elem.c = newList 
> end 
>
> return changed and elem or nil 
> end 
>
> return {{ 
> OrderedList = fixList, 
> BulletList = fixList, }}
>
> On Monday, February 27, 2023 at 12:33:54 AM UTC JDTS wrote:
>
>>
>> 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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