Implement MSYS Bash

pipenv/shells.py

@@ -134,6 +134,9 @@ def _iter_python(venv):
 
 
 class Bash(Shell):
+    def _format_path(self, python):
+        return python.parent.as_posix()
+
     # The usual PATH injection technique does not work with Bash.
     # https://github.com/berdario/pew/issues/58#issuecomment-102182346
     @contextlib.contextmanager
@@ -146,15 +149,25 @@ class Bash(Shell):
                 base_rc_src = 'source "{0}"\n'.format(bashrc_path.as_posix())
                 rcfile.write(base_rc_src)
 
-            export_path = 'export PATH="{0}:$PATH"\n'.format(
-                ":".join(python.parent.as_posix() for python in _iter_python(venv))
-            )
+            export_path = 'export PATH="{0}:$PATH"\n'.format(":".join(
+                self._format_path(python)
+                for python in _iter_python(venv)
+            ))
             rcfile.write(export_path)
             rcfile.flush()
             self.args.extend(["--rcfile", rcfile.name])
             yield
 
 
+class MsysBash(Bash):
+    def _format_path(self, python):
+        s = super(MsysBash, self)._format_path(python)
+        if not python.drive:
+            return s
+        # Convert "C:/something" to "/c/something".
+        return '/{drive}{path}'.format(drive=s[0].lower(), path=s[2:])
+
+
 class CmderEmulatedShell(Shell):
     def fork(self, venv, cwd, args):
         if cwd:
@@ -194,7 +207,7 @@ SHELL_LOOKUP = collections.defaultdict(
     lambda: collections.defaultdict(lambda: Shell),
     {
         "bash": collections.defaultdict(
-            lambda: Bash,
+            lambda: Bash, {"msys": MsysBash},
         ),
         "cmd": collections.defaultdict(
             lambda: Shell, {"cmder": CmderCommandPrompt},