Ok, after some more reading, I'm still unsure how to proceed ; and I 
actually don't see how I could to that with a filter.
I have dumped pandoc's native output format ; and the character I need to 
replace is not part of it. I guess it is added at the time of pandoc's 
writing the output document.
I don't know how how I can replace that character. Hopefully there is a 
pandoc setting I can tune so that I won't need to replace it at some late 
stage.



On Tuesday, September 21, 2021 at 10:42:14 AM UTC+2 Vin Cent wrote:

> Sorry for answering myself. I have RTFMed a bit in the while.
> I actually hint this can be simply done with a LUA filter.
> I will try to implement it as a self-exercice and report the result here.
>
> On Tuesday, September 21, 2021 at 9:34:26 AM UTC+2 Vin Cent wrote:
>
>> Hi,
>>
>> I am generating epub3 from latex source.
>> I was wondering why footnotes show a backlink to the original text when I 
>> display the document in calibre, and why they do not when I display the 
>> document on a kobo reader...
>>
>> ... until I found the backlink is indeed well present. It is "just" not 
>> displayed by kobo because the character set (by pandoc, I think) has no 
>> rendering on their font.
>>
>> The backlink character, copied and pasted from the .epub document itself, 
>> seems to be "↩︎".
>>
>> I see two possible tricks here so that the link will appear on kobo :
>> 1. Change the character to another one that would be rendered by kobo.
>> 2. Change the default font of the document to one that has rendering for 
>> that character.
>>
>> I have tried all available fonts on my device. There are actually three 
>> classes of them.
>> (Listing them all below, this might be of interest to somebody in the 
>> future)
>>
>> Avenir Next ; Georgia ; Kobo Nickel : these fonts render absolutely 
>> nothing for that character, leading the human to believe the backlink does 
>> not exist. It is present, clickable, just not rendered.
>>
>> Amasis ; Caecilia ; Gill Sans ; Malabar ; OpenDislexic : these fonts 
>> render "__" for that character. I find it "better" than the first family, 
>> but still not great. It is not obvious for a non-tehnical human that this 
>> is a backlink to the text.
>>
>> AR UDJingxihei ; Kobo UD Kakugo ; Kobo Tsukishi Mincho : display oriental 
>> character (I think this is chinese / japanese depending on font) for the 
>> backlink character.
>>
>>
>> Therefore, I tend to favor the first solution. Do you guys know of a way 
>> to customize the "backlink ↩︎" character set by pandoc in epub ?
>> Or is there a third approach ?
>>
>> Thanks,
>>
>> Vincent
>>
>

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