show: add editable location if package is editable (#11638)

Author: doronz88

news/11638.bugfix.rst

@@ -0,0 +1 @@
+Make ``pip show`` show the editable location if package is editable

src/pip/_internal/commands/show.py

@@ -53,6 +53,7 @@ class _PackageInfo(NamedTuple):
     name: str
     version: str
     location: str
+    editable_location: Optional[str]
     requires: List[str]
     required_by: List[str]
     installer: str
@@ -120,6 +121,7 @@ def _get_requiring_packages(current_dist: BaseDistribution) -> Iterator[str]:
             name=dist.raw_name,
             version=str(dist.version),
             location=dist.location or "",
+            editable_location=dist.editable_project_location,
             requires=requires,
             required_by=required_by,
             installer=dist.installer,
@@ -158,6 +160,8 @@ def print_results(
         write_output("Author-email: %s", dist.author_email)
         write_output("License: %s", dist.license)
         write_output("Location: %s", dist.location)
+        if dist.editable_location:
+            write_output("Editable project location: %s", dist.editable_location)
         write_output("Requires: %s", ", ".join(dist.requires))
         write_output("Required-by: %s", ", ".join(dist.required_by))