Commits on Jun 5, 2022

1. markup: add --citeproc to pandoc converter …

   Adds the citeproc filter to the pandoc converter.
   
   There are several PRs for it this feature already. However, I think
   simply adding `--citeproc` is the cleanest way to enable this feature,
   with the option to flesh it out later, e.g., in #7529.
   
   Some PRs and issues attempt adding more config options to Hugo which
   indirectly configure pandoc, but I think simply configuring Pandoc via
   Pandoc itself is simpler, as it is already possible with two YAML
   blocks -- one for Hugo, and one for Pandoc:
   
       ---
       title: This is the Hugo YAML block
       ---
       ---
       bibliography: assets/pandoc-yaml-block-bibliography.bib
       ...
       Document content with @citation!
   
   There are other useful options, e.g., #4800 attempts to use `nocite`,
   which works out of the box with this PR:
   
       ---
       title: This is the Hugo YAML block
       ---
       ---
       bibliography: assets/pandoc-yaml-block-bibliography.bib
       nocite: |
         @*
       ...
       Document content with no citations but a full bibliography:
   
       ## Bibliography
   
   Other useful options are `csl: ...` and `link-citations: true`, which
   set the path to a custom CSL file and create HTML links between the
   references and the bibliography.
   
   The following issues and PRs are related:
   
   - Add support for parsing citations and Jupyter notebooks via Pandoc and/or Goldmark extension #6101
     Bundles multiple requests, this PR tackles citation parsing.
   
   - WIP: Bibliography with Pandoc #4800
     Passes the frontmatter to Pandoc and still uses
     `--filter pandoc-citeproc` instead of `--citeproc`.
   - Allow configuring Pandoc #7529
     That PR is much more extensive and might eventually supersede this PR,
     but I think --bibliography and --citeproc should be independent
     options (--bibliography should be optional and citeproc can always be
     specified).
   - Pandoc - allow citeproc extension to be invoked, with bibliography. #8610
     Similar to #7529, #8610 adds a new config option to Hugo.
     I think passing --citeproc and letting the users decide on the
     metadata they want to pass to pandoc is better, albeit uglier.

   

   shoeffner committed Jun 5, 2022
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