allow sections in b-systems for other OSes

[Alexey T.]

e.g.

  "freebsd": {
     "cmd": ....
  }

• freebsd
• openbsd
• netbsd
• dragonflybsd
• solaris

[Alexey T.]

https://docs.python.org/3/library/os.html#os.uname
we need some hack of its result: "darwin" -> "osx"
and lower().

OS_KEY = os.uname()[0].lower()
if OS_KEY == 'darwin':
    OS_KEY = 'osx'

IS_WIN = OS_KEY=='windows'
IS_MAC = OS_KEY=='osx'
IS_LIN = not IS_WIN and not IS_MAC

[halfbrained]

from referenced os.uname doc:

Availability: recent flavors of Unix.

indeed on win7 it's missing

works on macos :)

[halfbrained]

I'll look into this a bit later

[Alexey T.]

IS_WIN = os.name=='nt'
IS_MAC = sys.platform=='darwin'
IS_LIN = not IS_WIN and not IS_MAC
OS_KEY = 'windows' if IS_WIN else ('osx' if IS_MAC else os.uname()[0].lower() )

[halfbrained]

thanks, changed

[halfbrained]

Works
linux on Ubuntu
osx on macos
windows on win
freebsd