Re: New custom reader for extracting content from web pages

[Z T <zzztirr-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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I'm in a similar position as the last response. This reader looks great, 
but despite having read as much documentation as I could on lua filters, I 
haven't been able to get this to work.

Is it possible to get this to work with copying the script or is it 
necessary to use 'npm install -g readability-cli'? Are there other 
prerequisites to using lua filters? I've 
seen https://pandoc.org/lua-filters.html#lua-interpreter-initialization but 
not sure I understand what the requirements are.


On Sunday, January 23, 2022 at 9:02:05 AM UTC+11 myke...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org wrote:

> Tried your suggestion from private (please excuse my shyness) message. 
>  Found out that this is well beyond my abilities.  Got node installed. 
>  Installed readability-cli.  Discovered that I had to have an init.lua 
> file.  Found one and saved it in directory holding pandoc.  Copied your 
> script and saved it as readable.lua, in the same directory.  Discovered 
> that I don't seem to know where init.lua and readable.lua need to go.  So 
> far, when I run "pandoc -f readable.lua [et cetera]", the response is: 
> "error running Lua: [new line] cannot open readable.lua: No such file or 
> directory."  All this was on MacOS.  Tried same on MSFT WinOS; similar 
> result.
> My weariness convinces me that I am Well Out of My Depth.  Don't seem to 
> know enough about Node, Lua, or whatever pandoc is written in.  Learned 
> some things about Node and Lua.  Success is over an horizon too far. 
>  Someday.
> Thanks anyway.
> Pandoc is still wonderful.
>  
>
> On Sunday, January 16, 2022 at 1:59:14 PM UTC-5 John MacFarlane wrote:
>
>>
>> I've added a new example of a custom reader, which runs 
>> the 'readability-cli' program on HTML input before processing 
>> it with pandoc, extracting the content and omitting navigation 
>> and layout. 
>>
>> See 
>>
>> https://pandoc.org/custom-readers.html#example-extracting-the-content-from-web-pages 
>>
>> This shows how the new custom reader interface, when combined 
>> with pandoc.read in the Lua API, can be used to add 
>> preprocessors. 
>>
>> (Of course, you could do something similar in a shell script. 
>> But doing it this way ensures that pandoc will be able to 
>> retrieve resources (e.g. images) from the URL. In addition, 
>> the filter does some further processing to remove structural 
>> Divs that clutter the output, and it is easily customizable.) 
>>
>

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