Fix corner case of pip hack workaround we should get rid of anyway

This is just an adjustment for our workaround for
pypa/pip#6097 to fix a corner case.
(The affected corner case was added to the unit test!)

So this code should really be thrown out once pip fixes that issue

Author: Jonas Thiem

pythonforandroid/pythonpackage.py

@@ -55,16 +55,21 @@
 
 
 def transform_dep_for_pip(dependency):
-    if dependency.find("@") > 0:
+    if dependency.find("@") > 0 and (
+            dependency.find("@") < dependency.find("://") or
+            "://" not in dependency
+            ):
         # WORKAROUND FOR UPSTREAM BUG:
         # https://github.com/pypa/pip/issues/6097
         # (Please REMOVE workaround once that is fixed & released upstream!)
         #
         # Basically, setup_requires() can contain a format pip won't install
         # from a requirements.txt (PEP 508 URLs).
-        # To avoid this, translate to an #egg-name= reference:
-        url = (dependency.partition("@")[2].strip() +
-               "#egg-name=" +
+        # To avoid this, translate to an #egg= reference:
+        if dependency.endswith("#"):
+            dependency = dependency[:-1]
+        url = (dependency.partition("@")[2].strip().partition("#egg")[0] +
+               "#egg=" +
                dependency.partition("@")[0].strip()
               )
         return url

tests/test_pythonpackage_basic.py

@@ -136,15 +136,31 @@ def test_get_dep_names_of_package():
 
 
 def test_transform_dep_for_pip():
-    transformed = transform_dep_for_pip(
-        "python-for-android @ https://github.com/kivy/"
-        "python-for-android/archive/master.zip"
+    # A reminder, this entire function we test here is just a workaround
+    # for https://github.com/pypa/pip/issues/6097 (and not a nice one.)
+    # As soon as upstream fixes it, we should throw it & this test out
+    transformed = (
+        transform_dep_for_pip(
+            "python-for-android @ https://github.com/kivy/" +
+            "python-for-android/archive/master.zip"
+        ),
+        transform_dep_for_pip(
+            "python-for-android @ https://github.com/kivy/" +
+            "python-for-android/archive/master.zip" +
+            "#egg=python-for-android-master"
+        ),
+        transform_dep_for_pip(
+            "python-for-android @ https://github.com/kivy/" +
+            "python-for-android/archive/master.zip" +
+            "#"  # common hack variant used by others to make pip parse it
+        ),
     )
     expected = (
-        "https://github.com/kivy/python-for-android/archive/master.zip"
-        "#egg-name=python-for-android"
+        "https://github.com/kivy/python-for-android/archive/master.zip" +
+        "#egg=python-for-android"
     )
-    assert transformed == expected
+    assert transformed == (expected, expected, expected)
+    assert transform_dep_for_pip("https://a@b/") == "https://a@b/"
 
 
 def test_is_filesystem_path():