Allow adding custom front matter to posts

[punchagan]

Some themes allow using custom front matter fields, other than the standard ones -- for example this theme (screenshot) allows marking posts as best posts

There could be a convention for the headline properties to add these custom fields - something like :EXPORT_FRONT_MATTER_{KEY}: value exporting to key = "value"

[kaushalmodi]

I don't know how to make the KEY portion in :EXPORT_FRONT_MATTER_{KEY}: value dynamic. My understanding is that all the backend keywords need to be defined in the :options-alist section of the definition.

This, though, has been on my list. I was thinking of implementing the same way :HUGO_MENU is implemented:

** Menu Meta Data in TOML Front Matter
:PROPERTIES:
:EXPORT_HUGO_MENU: :menu "something here" :weight 80 :parent posts :identifier foo1
:END:

Along the similar lines, we could have :HUGO_CUSTOM_FRONT_MATTER:

** Menu Meta Data in TOML Front Matter
:PROPERTIES:
:EXPORT_HUGO_CUSTOM_FRONT_MATTER: :foo bar :baz zoo
:END:

I would then parse that using a very similar (generalized) version of this.

Planning to tackle #37 the same way.

WDYT?

[punchagan]

I wasn't aware that backend keywords need to be defined in the :options-alist, and I hadn't yet gotten to looking at the Menu front matter implementation.

This seems like a reasonable way of doing it, especially given that another feature is already using this format/syntax.

[kaushalmodi]

I have implemented this in 8c97677.

Check out the example in that commit. You can close this issue if this works for you.

[punchagan]

That was quick, and works beautifully! Thanks!