Pyroma doesn't work on Windows 10

[sandeepbhat]

pyroma fails to run and results in the following error. black is just as an example here. pyroma fails when run on other folders containing python code as well.

Error information

$ pyroma.exe -d black/
------------------------------
Checking black/
Exception when running setup.
Traceback (most recent call last):
  File "c:\users\sanbha\work\black\env\lib\site-packages\pyroma\projectdata.py", line 138, in run_setup
    exec_(f.read(), glocals, glocals)
  File "c:\users\sanbha\work\black\env\lib\encodings\cp1252.py", line 23, in decode
    return codecs.charmap_decode(input,self.errors,decoding_table)[0]
UnicodeDecodeError: 'charmap' codec can't decode byte 0x81 in position 22: character maps to <undefined>
Traceback (most recent call last):
  File "C:\Users\sanbha\AppData\Local\Programs\Python\Python36\Lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "C:\Users\sanbha\AppData\Local\Programs\Python\Python36\Lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\sanbha\work\black\env\Scripts\pyroma.exe\__main__.py", line 9, in <module>
  File "c:\users\sanbha\work\black\env\lib\site-packages\pyroma\__init__.py", line 63, in main
    rating = run(mode, argument)
  File "c:\users\sanbha\work\black\env\lib\site-packages\pyroma\__init__.py", line 75, in run
    data = projectdata.get_data(os.path.abspath(argument))
  File "c:\users\sanbha\work\black\env\lib\site-packages\pyroma\projectdata.py", line 167, in get_data
    distro = run_setup('setup.py', stop_after='config')
  File "c:\users\sanbha\work\black\env\lib\site-packages\pyroma\projectdata.py", line 151, in run_setup
    script_name)
RuntimeError: 'distutils.core.setup()' was never called -- perhaps 'setup.py' is not a Distutils setup script?

Steps to reproduce

1. Clone black repository → git clone git@github.com:ambv/black.git
2. Create virtualenv → virtualenv black/
3. Activate virtualenv → $ . env/Scripts/activate
4. Install pyroma using pip → pip install pyroma
5. Run pyroma → pyroma -d black/

Environment

Operating system: Windows 10 Enterprise
Python version: 3.6.6, PE32+ executable (console) x86-64, for MS Windows
pyroma version: 2.3.1
Bash version: GNU bash, version 4.4.19(2)-release (x86_64-pc-msys)

[regebro]

Indeed, it seems to not work on Windows.

[CAM-Gerlach]

Taking a quick glance at the traceback, this looks like a basic mistake that is unfortunately quite common, but very easy to fix. What's likely happening is you're reading setup.py without correctly specifying the encoding (i.e. utf-8, as required by the relevant standards). The default encoding for open in text mode is locale.getpreferredencoding() which defaults to the current ANSI codepage on Windows, most commonly Windows-1252 (cp1252). This is almost never what you want; you should instead always explicitly specify an encoding, i.e. encoding="utf-8". Otherwise, the read will fail with an encoding-related error (as seen here) if the file contains any non-ASCII characters.

[CAM-Gerlach]

I can confirm that, both with the latest pyroma 3.0.1, and pyroma 2.4 (the latest available on conda), Pyroma works in a test package with a pure-ASCII setup.py, while if I introduce non-ASCII characters within a string literal, I can reproduce the above error. Therefore, very likely the above is the case.

[CAM-Gerlach]

Indeed, adding encoding="UTF-8" to the offending line 122 of projectdata.py fixes this. I'll submit a PR shortly.

[CAM-Gerlach]

Opened as PR #53

[CAM-Gerlach]

@regebro Seems this can be unpinned? Maybe pin the PyPI issue instead?