Upgrade arxiv dependency to 1.4.1

[lukasschwab]

Changes

• Pins arxiv==1.4.1.
  • Factors out a list_papers helper to centralize exception-handling for nonexistent IDs.
• Uses fully-qualified old-format arXiv IDs; see get_short_id incorrect for pre-March 2007 arXiv identifiers: missing archive lukasschwab/arxiv.py#74.
• Parameterizes unit tests. Doesn't change which unit tests get run, but treats each set of parameters as its own pytest test.
• Reduces lookup for paper version to a single request rather than iterating through all versions.

Testing

Most of the unit tests fail in my local environment, but this seems to be a matter of missing required LaTeX packages: the pdflatex builds fail. You may have better luck in your testing environment!

Some of the tests do pass and generate the expected PDFs, which makes me confident in my use of the upgraded arxiv package. The comparxiv outputs for those failures include the expected authors and titles:

                                    __  ___
  ___ ___  _ __ ___  _ __   __ _ _ _\ \/ (_)_   __
 / __/ _ \| '_ ` _ \| '_ \ / _` | '__\  /| \ \ / /
| (_| (_) | | | | | | |_) | (_| | |  /  \| |\ V /
 \___\___/|_| |_| |_| .__/ \__,_|_| /_/\_\_| \_/
                    |_|

Version 0.1.7, developed by Timon Emken (2020)

Compare [1907.06674]: v2 vs v3

Title:		Death by Dark Matter
Authors:	 Jagjit Singh Sidhu, Robert J Scherrer, Glenn Starkman

1.) Download and unpack source files:

2.1) Identify master tex files:
	1907.06674v2:	main_bob_gds.tex
	1907.06674v3:	main_resubmit.tex

2.2) Identify bbl files:
	1907.06674v2:	main_bob_gds.bbl
	1907.06674v3:	main_resubmit.bbl

3.1) Run latexdiff on the tex files.

3.2) Run latexdiff on the bbl files.

4.) Generate a pdf with pdflatex.
	Warning: No pdf could be generated. Copy the .bbl file of version b and try again.

Failure! No pdf file could be generated.
Troubleshooting:
	1.) To see more terminal output run:
		'comparxiv --show_latex_output 1907.06674 2 3'
	2.) In some cases latex math environments cause problems with latexdiff. Try running:
		'comparxiv --dont_compare_equations 1907.06674 2 3'

Notes

The AttributeError handling corresponds to a known bug: lukasschwab/arxiv.py#80

When that bug is closed, the exception-handling here can be tightened or the list_papers helper can be removed altogether.

Feel free to treat this as really low-priority. The existing usage of the v0 client isn't broken, but v1 is simpler, better-typed, and easier to extend.

[lukasschwab]

@temken do you think this merits review?

If yes, I can update the dependency to 1.4.2.

[temken]

Hi @lukasschwab, This looks great. Apologies for the late reply. I will check the details soon.

[lukasschwab]

@temken I'm going to close this so I have fewer open PRs; feel free to reopen it and tag me if you see fit.

Cheers

[temken]

Thanks @lukasschwab, I will re-open this once I find the time. Apologies for the delay.

[temken]

Apologies again for the delay. I appreciate your contribution, the code looks good. I will also update the dependency to 1.4.2.