Option to use relative file paths in report

[teake]

Is your feature request related to a problem? Please describe.
The new relative_files config options toggle whether relative paths are stored in the data files, and also how they're reported in XML reports. However, file paths are still absolute in the CLI report (i.e. the one shown with coverage report).

Describe the solution you'd like
A possibility to have the CLI report respect relative_files and show relative paths, either by default or through a toggle.

Describe alternatives you've considered
Using sed to remove the prefix in reported file paths.

Additional context
Related issue: #948.

[teake]

Also: thanks for the great package!

[warsaw]

I think this issue describes the problem I am having too. I reached for relative_files but it didn't solve my problem. For $reasons, our build system wants to run coverage (through pytest) in a different directory, against the the installed site-packages location of our code inside a venv. While I'm not super happy about that, I can't change it. But this leads to ugly and useless absolute paths in the coverage console report:

---------- coverage: platform darwin, python 3.7.7-final-0 -----------
Name                                                                                                                                                         Stmts   Miss Branch BrPart  Cover   Missing
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
/Users/bwarsaw/projects/xx/xxxx-xxxxxxx_trunk/build/xxxx-xxxxxxx/environments/satellites/project/lib/python3.7/site-packages/xxxxxxxx/xxxxxxx/__init__.py        0      0      0      0   100%
/Users/bwarsaw/projects/xx/xxxx-xxxxxxx_trunk/build/xxxx-xxxxxxx/environments/satellites/project/lib/python3.7/site-packages/xxxxxxxx/xxxxxxx/constants.py      19      0      0      0   100%
/Users/bwarsaw/projects/xx/xxxx-xxxxxxx_trunk/build/xxxx-xxxxxxx/environments/satellites/project/lib/python3.7/site-packages/xxxxxxxx/xxxxxxx/exception.py       5      0      0      0   100%
/Users/bwarsaw/projects/xx/xxxx-xxxxxxx_trunk/build/xxxx-xxxxxxx/environments/satellites/project/lib/python3.7/site-packages/xxxxxxxx/xxxxxxx/xxxxxxx.py        67     10     36      7    82%   89->90, 90, 101->102, 102, 115->121, 134->135, 135, 137->161, 141->142, 142, 144->145, 145, 161-162, 168-171
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                                                                                                                           91     10     36      7    85%

I would love to find a way to chop off everything left of and including the site-packages component.

[cnzhujie]

This problem also happened in the html report

[nedbat]

See also #277.

[nedbat]

Is it enough to use the relative file as stored?

[teake]

I think so. But where are they stored? I cannot find any relative paths in the data file. I'm running 6.1.1 on Python 3.10.0 via

$ MY_DIR=$(pwd)
$ cd /tmp
$ PYTHONPATH=$MY_DIR coverage run --rcfile=$MY_DIR/.coveragerc --source=$MY_DIR -m pytest $MY_DIR/tests

with relative_files = True in .coveragerc. Am I overlooking something?