Fix calculate_dotted_path_from_sys_path. It was broken beyond stupid.

jedi/api/__init__.py

@@ -32,7 +32,7 @@ from jedi.evaluate import imports
 from jedi.evaluate import usages
 from jedi.evaluate.arguments import try_iter_content
 from jedi.evaluate.helpers import get_module_names, evaluate_call_of_leaf
-from jedi.evaluate.sys_path import dotted_path_in_sys_path
+from jedi.evaluate.sys_path import calculate_dotted_path_from_sys_path
 from jedi.evaluate.filters import TreeNameDefinition, ParamName
 from jedi.evaluate.syntax_tree import tree_name_to_contexts
 from jedi.evaluate.context import ModuleContext
@@ -149,7 +149,10 @@ class Script(object):
     def _get_module(self):
         names = ('__main__',)
         if self.path is not None:
-            import_names = dotted_path_in_sys_path(self._evaluator.get_sys_path(), self.path)
+            import_names = calculate_dotted_path_from_sys_path(
+                self._evaluator.get_sys_path(),
+                self.path
+            )
             if import_names is not None:
                 names = import_names
 

jedi/evaluate/context/module.py

@@ -145,7 +145,6 @@ class ModuleContext(ModuleMixin, TreeContext):
         self._path = path
         self._string_names = string_names
         self.code_lines = code_lines
-        #print(self._path)
 
     def _get_init_directory(self):
         """

jedi/evaluate/imports.py

@@ -517,7 +517,7 @@ def get_modules_containing_name(evaluator, modules, name):
             code = python_bytes_to_unicode(f.read(), errors='replace')
             if name in code:
                 e_sys_path = evaluator.get_sys_path()
-                import_names = sys_path.dotted_path_in_sys_path(e_sys_path, path)
+                import_names = sys_path.calculate_dotted_path_from_sys_path(e_sys_path, path)
                 module = _load_module(
                     evaluator, path, code,
                     sys_path=e_sys_path,

jedi/evaluate/sys_path.py

@@ -197,31 +197,38 @@ def _get_buildout_script_paths(search_path):
             continue
 
 
-def dotted_path_in_sys_path(sys_path, module_path):
+def calculate_dotted_path_from_sys_path(sys_path, module_path):
     """
     Returns the dotted path inside a sys.path as a list of names.
+
+    This function is supposed to be a backup plan in case there's no idea where
+    a file is lying.
     """
     # First remove the suffix.
     for suffix in all_suffixes():
         if module_path.endswith(suffix):
             module_path = module_path[:-len(suffix)]
-        break
+            break
     else:
         # There should always be a suffix in a valid Python file on the path.
         return None
 
-    if module_path.startswith(os.path.sep):
-        # The paths in sys.path most of the times don't end with a slash.
-        module_path = module_path[1:]
+    if module_path.endswith('__init__'):
+        module_path = module_path[:-len('__init__') - 1]
+
+    if module_path.endswith(os.path.sep):
+        # The paths in sys.path may end with a slash.
+        module_path = module_path[:-1]
 
     for p in sys_path:
         if module_path.startswith(p):
             rest = module_path[len(p):]
+            if rest.startswith(os.path.sep) or rest.startswith('/'):
+                rest = rest[1:]
             if rest:
                 split = rest.split(os.path.sep)
                 for string in split:
                     if not string or '.' in string:
                         return None
-                return split
-
+                return tuple(split)
     return None

test/test_evaluate/test_sys_path.py

@@ -3,6 +3,8 @@ from glob import glob
 import sys
 import shutil
 
+import pytest
+
 from jedi.evaluate import sys_path
 from jedi.api.environment import create_environment
 
@@ -59,3 +61,19 @@ def test_venv_and_pths(venv_path):
 
     # Ensure that none of venv dirs leaked to the interpreter.
     assert not set(sys.path).intersection(ETALON)
+
+
+@pytest.mark.parametrize(('sys_path_', 'path', 'expected'), [
+    (['/foo'], '/foo/bar.py', ('bar',)),
+    (['/foo'], '/foo/bar/baz.py', ('bar', 'baz')),
+    (['/foo'], '/foo/bar/__init__.py', ('bar',)),
+    (['/foo'], '/foo/bar/baz/__init__.py', ('bar', 'baz')),
+
+    (['/foo'], '/foo/bar.so', ('bar',)),
+    (['/foo'], '/foo/bar/__init__.so', ('bar',)),
+
+    (['/foo'], '/x/bar.py', None),
+    (['/foo'], '/foo/bar.xyz', None),
+])
+def test_calculate_dotted_path_from_sys_path(path, sys_path_, expected):
+    assert sys_path.calculate_dotted_path_from_sys_path(sys_path_, path) == expected