Issue #5 - Fix for empty projects or code without modules

swift_code_metrics/_analyzer.py

@@ -7,15 +7,23 @@
 
 
 class Inspector:
-    def __init__(self, directory, artifacts, tests_default_suffixes, exclude_paths=None):
-        if exclude_paths is None:
-            exclude_paths = []
+    def __init__(self, directory, artifacts, tests_default_suffixes, exclude_paths):
+        self.exclude_paths = exclude_paths
+        self.directory = directory
+        self.artifacts = artifacts
+        self.tests_default_suffixes = tests_default_suffixes
         self.frameworks = []
-        if directory is not None:
+        self.report = None
+
+    def analyze(self) -> bool:
+        if self.directory is not None:
             # Initialize report
-            self.__analyze_directory(directory, exclude_paths, tests_default_suffixes)
-            self.report = self._generate_report()
-            self._save_report(artifacts)
+            self.__analyze_directory(self.directory, self.exclude_paths, self.tests_default_suffixes)
+            if len(self.frameworks) > 0:
+                self.report = self._generate_report()
+                self._save_report(self.artifacts)
+                return True
+        return False
 
     def filtered_frameworks(self, is_test=False):
         return seq(self.frameworks) \

swift_code_metrics/_metrics.py

@@ -114,7 +114,10 @@ def percentage_of_comments(noc, loc):
         :param loc: the number of lines of code
         :return: The POC value (double)
         """
-        return 100 * noc / (noc + loc)
+        noc_loc = noc + loc
+        if noc_loc == 0:
+            return 0
+        return 100 * noc / noc_loc
 
     # Analysis
 

swift_code_metrics/scm.py

@@ -2,7 +2,7 @@
 
 from argparse import ArgumentParser
 
-from ._helpers import ReportingHelpers
+from ._helpers import Log,ReportingHelpers
 from ._analyzer import Inspector
 from ._presenter import GraphPresenter
 from .version import VERSION
@@ -66,6 +66,10 @@ def main():
     # Inspects the provided directory
     analyzer = Inspector(directory, artifacts, default_tests_paths, exclude)
 
+    if not analyzer.analyze():
+        Log.warn('No valid swift files found in the project')
+        sys.exit(0)
+
     if not should_generate_graphs:
         sys.exit(0)
 

swift_code_metrics/tests/test_integration.py

@@ -28,12 +28,32 @@ def test_sample_app(self):
         generated_json = IntegrationTest.read_json_file(output_file)
         self.assertEqual(generated_json, expected_json)
 
-
     @staticmethod
     def read_json_file(path):
         with open(path, 'r') as fp:
             return json.load(fp)
 
 
+class IntegrationUnhappyTest(unittest.TestCase):
+
+    def setUp(self):
+        self.maxDiff = None
+        sys.argv.clear()
+        sys.argv.append(os.path.dirname(os.path.realpath(__file__)))
+        sys.argv.append("--source")
+        sys.argv.append("any")
+        sys.argv.append("--artifacts")
+        sys.argv.append("any")
+
+    def tearDown(self):
+        sys.argv.clear()
+
+    def test_sample_app(self):
+        with self.assertRaises(SystemExit) as cm:
+            scm.main()  # should not throw exception and return 0
+
+        self.assertEqual(cm.exception.code, 0)
+
+
 if __name__ == '__main__':
     unittest.main()

swift_code_metrics/tests/test_metrics.py

@@ -111,6 +111,12 @@ def test_total_dependencies(self):
         self.assertEqual(expected_deps,
                          Metrics.total_dependencies(self.foundation_kit))
 
+    def test_poc_valid_loc_noc(self):
+        self.assertEqual(50, Metrics.percentage_of_comments(loc=2, noc=2))
+
+    def test_poc_invalid_loc_noc(self):
+        self.assertEqual(0, Metrics.percentage_of_comments(loc=0, noc=0))
+
     @property
     def __dummy_external_frameworks(self):
         return [