Standard markdown syntax for tables can lead to empty tables in HTML

[ljpengelen]

I noticed that markdown like the following will be translated to an empty table:

| Header A | Header B |
| -------- | -------- |
| 1        | 2        |

The HTML tags are present in the output, but the content isn't:

<table><thead><tr></tr></thead><tbody><tr></tr><tr></tr></tbody></table>

This has to do with what's happening in pre-process-md:

(defn pre-process-markdown [markdown]
  (-> markdown
      (str/replace #"--" (fn [_] "$$NDASH$$"))
      (str/replace #"\[[^\]]+\n"
                   (fn [match]
                     (str/replace match "\n" "$$RET$$")))))

If I use the following markup, the table ends up in the output just fine:

| Header A | Header B |
| - | - |
| 1        | 2        |

I'm happy to look into this, but I'm not sure what the intention of pre-process-markdown is.

[borkdude]

The intention of "$$RET$$" is to work around some bugs in the markdown-clj lib. It causes:

[foo 
bar](https://foobar.com)

to incorrectly render. I don't know if this is still the case or if it was fixed. Worth looking into an upgrade and if it isn't fixed yet, I'm open to another fix.

I'm not sure what the $$NDASH$$ was. It might have to do with code formatting.

I removed it for now and I'll revisit when I discover what it was for :)

[ljpengelen]

Thanks for the quick fix!