Fix dependencies check for distribution

Author: MaxvandenBoom

erdetect/__init__.py

@@ -13,31 +13,30 @@
 # Note 1: added since, despite the (minimum) requirements during install, packages can be downgraded or removed later
 # Note 2: deliberately not in a separate module, since this is the entry point of the package and dependencies already be used after
 #
-from os.path import join, dirname, abspath
-from configparser import ConfigParser
-from importlib.metadata import version, PackageNotFoundError
+from importlib.metadata import version, PackageNotFoundError, requires
 from re import sub as re_sub, split as re_split
 def normalize_version(v):
     return [int(x) for x in re_sub(r'(\.0+)*$','', v).split(".")]
 
-cf = ConfigParser()
-cf.read(join(dirname(abspath(__file__)), '..', 'setup.cfg'))
-require_lines = [x for x in cf.get('options', 'install_requires').strip().splitlines()]
-
-for req_line in require_lines:
-    for req_line_part in req_line.split(','):
-        req_args = re_split('>=|==', req_line_part.strip())
-        if len(req_args) == 2:
-            req_args[0] = req_args[0].strip()
-            req_args[1] = req_args[1].strip()
-            try:
-                current_version = version(req_args[0])
-                if normalize_version(current_version) < normalize_version(req_args[1]):
-                    sys.exit('Dependency \'' + req_args[0] + '\' is installed but outdated: the current version is \'' + current_version + '\', while version ' + req_args[1] + ' or higher is required.\n'
-                             'Execute \'pip install --upgrade ' + req_args[0] + '\' in the command-line prompt/terminal to update the package\n')
-            except PackageNotFoundError as err:
-                sys.exit('Dependency \'' + req_args[0] + '\' is required but not installed.\n'
-                         'Execute \'pip install ' + req_args[0] + '\' in the command-line prompt/terminal to install the package\n')
+try:
+    require_lines = [p for p in requires('erdetect')]
+    for req_line in require_lines:
+        for req_line_part in req_line.split(','):
+            req_args = re_split('>=|==', req_line_part.strip())
+            if len(req_args) == 2:
+                req_args[0] = req_args[0].strip()
+                req_args[1] = req_args[1].strip()
+                try:
+                    current_version = version(req_args[0])
+                    if normalize_version(current_version) < normalize_version(req_args[1]):
+                        sys.exit('Dependency \'' + req_args[0] + '\' is installed but outdated: the current version is \'' + current_version + '\', while version ' + req_args[1] + ' or higher is required.\n'
+                                 'Execute \'pip install --upgrade ' + req_args[0] + '\' in the command-line prompt/terminal to update the package\n')
+                except PackageNotFoundError as err:
+                    sys.exit('Dependency \'' + req_args[0] + '\' is required but not installed.\n'
+                             'Execute \'pip install ' + req_args[0] + '\' in the command-line prompt/terminal to install the package\n')
+except PackageNotFoundError as err:
+    # not running a distribution, skip checks
+    pass
 
 
 #