Source code for pint.config

# config.py

# Functions related to PINT configuration

import os
from .extern import appdirs

# Values for appdirs calls
_app = 'pint'
_auth = 'pint'

# PINT install dir
_install_dir = os.path.abspath(os.path.dirname(__file__))

def datapath(fname):
    """Returns the full path to the requested data file.  Will first search
    the appdirs user_data_dir (typically $HOME/.local/share/pint on linux)
    then the installed data files dir (__file__/datafiles).  If the file 
    is not found, returns None."""

    # List of directories to search, in order
    search_dirs = [
            appdirs.user_data_dir(_app,_auth),
            os.path.join(_install_dir, 'datafiles')
            ]

    for d in search_dirs:
        full_fname = os.path.join(d,fname)
        if os.path.exists(full_fname): return full_fname

    return None