--zero-exit on CI and pre-commit gives false negative

[abelsiqueira]

cc @sjvrijn @luisaforozco which helped track this down

Description

I noticed that both the CI [1] and the pre-commit [2] use --zero-exit. But --zero-exit is telling prospector to ignore the issues it found, since the flag check [3] is run before the length of the messages check [4].

I think that defeats the purpose of having it on the CI and pre-commit.
As an example, I ran prospector on this repo and got 24 issues.[5]

[1] https://github.com/PyCQA/prospector/blob/197622ef559b2056c7d3fa486be84d9251026be7/.github/workflows/tests.yml#L31

[2] https://github.com/PyCQA/prospector/blob/197622ef559b2056c7d3fa486be84d9251026be7/.pre-commit-config.yaml#L42

[3] https://github.com/PyCQA/prospector/blob/866b79ed7aa381266939bcac952df40993dbfad3/prospector/run.py#L201-L204

[4]
https://github.com/PyCQA/prospector/blob/866b79ed7aa381266939bcac952df40993dbfad3/prospector/run.py#L209-L211

[5]

$ poetry run prospector
...
=================
         Started: 2023-02-20 15:42:43.808330
        Finished: 2023-02-20 15:42:53.087899
      Time Taken: 9.28 seconds
       Formatter: grouped
        Profiles: .prospector.yml, no_doc_warnings, no_member_warnings, no_test_warnings, strictness_medium, strictness_high, strictness_veryhigh
      Strictness: from profile
  Libraries Used: 
       Tools Run: dodgy, mypy, profile-validator, pycodestyle, pyflakes, pylint
  Messages Found: 24
 External Config: pylint: ####/prospector/pyproject.toml

Expected result

• Expected prospector to return 0 issues on prospector.
• Maybe change flag to --ignore-errors to make the purpose clearer.

Environment (please complete the following information):

• OS: linux
• poetry run prospector
• Version 1.9.1
• Python 3.9.16

Additional context

I was trying to change from a manual .githooks/pre-commit configuration to pre-commit (https://pre-commit.com). The project passes prospector but was failing pre-commit run -a (with pylint: import-error / Unable to import). I was looking through other pre-commit configs trying to fix it and noticed that the zero-exit flag could lead to errors.