Python filters and markdown links

[madsmh]

I am trying to manipulate markdown wikilinks when converting to LaTeX, and I am calling pandoc with -f markdown+wikilinks_title_after_pipe+attributes+fenced_divs. I have written the python filter:

import sys
from pandocfilters import toJSONFilters, RawBlock, RawInline

def eprint(*args, **kwargs):
    print(*args, file=sys.stderr, **kwargs)

def convert_links(key, value, format, meta):
    if format == "latex":
        if key == "Link":
            eprint("BLAH")

if __name__ == "__main__":
    toJSONFilters([convert_links])

However, when running the filter on markdown file with links, I get no output, i.e. I get no notice saying BLAH....
Best, Mads

[jgm]

Why don't you eprint key and format and see what you get?
That might reveal the issue (which isn't obvious to me, but I haven't looked at pandocfilters for a long time).

[madsmh]

Ah good idea! I made a test file:

# Test

blah [[Notes for Week 1.md|IBM]]

and
used the filter

def convert_links(key, value, format, meta):
    if format == "latex":
        eprint(key)

This resulted in the output

Space
Str
Space
Str
Space
Str
Space
Str

so it does not seem that the link is recognized.

[jgm]

Try using -t native to see the AST that is parsed.

[madsmh]

I tried with the test file:

# Test

blah [[Notes.md|IBM]]

as the lack of a space in the URL seemd to make a difference., this produced the AST:

Pandoc
  Meta { unMeta = fromList [] }
  [ Header 1 ( "" , [] , [] ) [ Str "Test" ]
  , Para [ Str "blah" , Space , Str "[[Notes.md|IBM]]" ]
  ]

[jgm]

Here's what I see:

% pandoc -f markdown+wikilinks_title_after_pipe -t native
# Test

blah [[Notes.md|IBM]]
[ Header 1 ( "test" , [] , [] ) [ Str "Test" ]
, Para
    [ Str "blah"
    , Space
    , Link
        ( "" , [ "wikilink" ] , [] )
        [ Str "IBM" ]
        ( "Notes.md" , "" )
    ]
]

Either you're using an old version of pandoc without this extension, or you forgot to specify the extension?

[madsmh]

I am using Pandoc 8.1 from https://github.com/jgm/pandoc/releases/download/3.8/pandoc-3.8-1-amd64.deb .
When I run pandoc --list-extensions=markdown the list contains -wikilinks_title_after_pipe. I have specified the input format as
markdown+wikilinks_title_after_pipe+attributes+fenced_divs.

[jgm]

I don't know how to explain the fact that you are getting different output than I am.
But unless I can reproduce the issue, I cannot help.