pandoc#biblio#sources and data dir

[twsh]

If 'l' is part of the flag for pandoc#biblio#sources, vim-pandoc will look for bibliographies in $HOME/.pandoc/ and %APPDATA%/pandoc/. The documentation describes these as Pandoc's data dir (for *nix and Windows, respectively). Pandoc now uses something else as its default data dir for *nix: https://github.com/jgm/pandoc/releases/tag/2.7

The new default for *nix is $HOME/.local/share/pandoc/. I think that vim-pandoc should look there as well as the directory it looks in now.

An enhancement would be to have vim-pandoc use whatever the data dir is, even if it is changed from the default.

The relevant code in vim-pandoc is here:

vim-pandoc/python3/vim_pandoc/bib/collator.py

Lines 75 to 89 in d4fc6f8

	def pandoc_local_search():
	"""
	Search for bibliographies in the pandoc data dirs.
	"""
	if os.path.exists(os.path.expandvars("$HOME/.pandoc/")):
	b = os.path.expandvars("$HOME/.pandoc/")
	elif os.path.exists(os.path.expandvars("%APPDATA%/pandoc/")):
	b = os.path.expandvars("%APPDATA%/pandoc/")
	else:
	return []
	search_paths = [b + "default." + f for f in bib_extensions]
	bibfiles = [os.path.abspath(f) for f in search_paths if os.path.exists(f)]
	return bibfiles

Unless this turns out to be a mistake, I can do a PR for the simple version and think about the enhancement.

[twsh]

Having thought about it, I think that there is no need for the enhancement. The only use case I can think of would be satisfied by adding a path directly to the sources.