[2pt] fio.basename behavior doesn't conform to POSIX

[rosik]

Product: Tarantool
Audience/target: dev
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/fio

Details

Tarantool version - 2.8.0-75-g6610bce9b (but actually all)

tarantool> fio.dirname('/x/')
---
- /
...

tarantool> fio.basename('/x/')
---
- 
...

Expected behavior

$ dirname '/x/'
/
$ basename '/x/'
x

See also https://pubs.opengroup.org/onlinepubs/9699919799/

[rosik]

As colleagues point, this behavior mimics python, not bash.

https://docs.python.org/3/library/os.path.html#os.path.basename

Note that the result of this function is different from the Unix basename program; where basename for '/foo/bar/' returns 'bar', the basename() function returns an empty string ('').

I guess it'll never be changed in code, so I'm transferring this issue to the doc repo. Let's at least describe it properly.