clib.Session.virtualfile_in: Refactor if-else statements into match-case statements

[seisman]

Description of proposed changes

This is another refactor about virtualfile_in after PR #3482 and PR #3351. This PR converts the if-else statements into match-case statements.

[seisman]

_data = (data,) if not isinstance(data, pathlib.PurePath) else (str(data),) is changed to _data = (data,).

For reference, the code str(data) was initially added in #1382 to support passing pathlib.Path as filenames. It turns out it's no longer necessary because the build_arg_list function already handle with pathlib.Path objects correctly:

pygmt/pygmt/helpers/utils.py

Lines 516 to 520 in d41922c

	if infile: # infile can be a single file or a list of files
	if isinstance(infile, str | pathlib.PurePath):
	gmt_args = [str(infile), *gmt_args]
	else:
	gmt_args = [str(_file) for _file in infile] + gmt_args

.

The support of pathlib.Path objects can even be tracked back to the old, deprecated build_arg_string function (xref: #1837).

We already have a lot of tests that takes a pathlib.Path object as input (e.g.,

pygmt/pygmt/tests/test_info.py

Line 20 in d41922c

def test_info():

). So the changes should be safe if all tests pass.