Replace the bibparse backend of 'g:vimtex_parser_bib_backend' with GooseBib

[krishnakumarg1984]

bibparse is one of the options that can be set for g:vimtex_parser_bib_backend. Firstly, the documentation was missing the URL or other background information about bibparse for those who have never heard of this before. But that is quickly addressed with some basic web searching :).

Secondy, and more seriously, it looks like bibparse itself is deprecated in favour of Goosebib. Quite ominously, the README.md ominously warns: In time this respository will be removed.

It looks like it would be prudent to include Goosebib as one of the options for g:vimtex_parser_bib_backend, along with a documentation update to point users to the relevant Github URL. Also, some pointers to set this conditionally would be nice I think, i.e. something along the lines of:

if executable('GbibParse')
let g:vimtex_parser_bib_backend='Gbibparse'
endif

Finally, it also looks like the host of tools provided by the Goosebib suite looks like a useful way to fix/clean/slice/dice bib files. I think this tool can be mentioned in the Filetype plugin for bib files section early in the documentation, wherein useful tools like bibtool are mentioned. Also for posterity, I am updating #1293 with Goosebib since this issue is also linked to from the documentation, making it easier for new readers to refer to a centralised place for bib tools.

[lervag]

Interesting! An issue here is that GooseBib does not give a simple output to parse; GbibParse input.bib output.bib outputs a cleaned up bibtex file, still in fully bibtex format. Thus, the parsing remains. The "benefit" of bibparse was that it outputted a much easier format where it was trivial to parse it. Essentially, it seems GooseBib does not give any benefits over internal parsing within vimtex. Thus, I don't see a good reason to support it.

However, it might be necessary to drop support for bibparse in the future, if it is fully removed. :\

[lervag]

But: Perhaps a better idea is to use directly the bibtexparser library!

[lervag]

Ok, I've added bibtexparser as a new backend and updated the docs. However, for some reason, bibtexparser is not very fast. I assume it is not so strange, as Python is not really so fast. I guess bibparse, which uses bibtexparser, is fast because it is compiled or something like that. I don't know.

Do you have any thoughts?

[lervag]

Hah! I just noticed (and now remember) that bibparse is not the Python implementation. There's a name confusion here. bibparse comes from Text-BibTeX, a perl package. For some reason, installing this does not provide the bibparse executable on all systems. On Arch Linux, if you install perl-text-bibtex, you will get the bibparse executable. Since this parser is written in C, it is very fast. FYI, the bibtexparser parser which is used by the Python projects bibparse and GooseBib is very slow, even slower than the internal parser I've written in vimscript.

In any case, I've made things more clear in the docs and I've added support for the bibtexparser python library now, which at least gives more options.

[krishnakumarg1984]

Most of the stuff you mentioned flew over my head, but I could understand things better through your latest docs update. Thanks a lot for looking into this Karl!

[krishnakumarg1984]

Would this syntax be correct (for portability of a common .vimrc between machines with & without the bibparse perl library)?

if executable('bibParse')
       let g:vimtex_parser_bib_backend='bibparse'
endif

[lervag]

Would this syntax be correct (for portability of a common .vimrc between machines with & without the bibparse perl library)?

Almost! The executable string should be lower case, I believe: executable('bibparse').

[krishnakumarg1984]

Thank you. This could perhaps be mentioned in the docs, like how you have provided conditional checks for setting up various other functionality (e.g. the documentation handlers).

[lervag]

Agreed.

[krishnakumarg1984]

So, this bibparse executable comes from where? From the goodebib package?

[lervag]

This is what I wrote in the docs (:help g:vimtex_parser_bib_backend):

    `bibparse`: Also fast, but might be more robust.

              Note: bibparse is an executable provided by the Perl package
                    Text-BibTeX [0]. It should not be confused with the
                    similarly named Python project [1]. The latter is
                    deprecated in favor of GooseBib [2]. The Python projects
                    bibparse and GooseBib are both based on the Python library
                    `bibtexparser`.

                    [0]: https://metacpan.org/dist/Text-BibTeX
                    [1]: https://github.com/tdegeus/bibparse
                    [2]: https://github.com/tdegeus/GooseBib