Refactored the shell command to fix IPython and make way for BPython support.

pecan/commands/shell.py

@@ -3,14 +3,60 @@ Shell command for Pecan.
 """
 from pecan.commands import BaseCommand
 from webtest import TestApp
+from warnings import warn
 import sys
 
 
+class NativePythonShell(object):
+
+    @classmethod
+    def invoke(cls, ns, banner):
+        import code
+        py_prefix = sys.platform.startswith('java') and 'J' or 'P'
+        shell_banner = 'Pecan Interactive Shell\n%sython %s\n\n' % \
+            (py_prefix, sys.version)
+        shell = code.InteractiveConsole(locals=ns)
+        try:
+            import readline  # noqa
+        except ImportError:
+            pass
+        shell.interact(shell_banner + banner)
+
+
+class IPythonShell(object):
+
+    @classmethod
+    def invoke(cls, ns, banner):
+        try:
+            from IPython.frontend.terminal.embed import (
+                InteractiveShellEmbed
+            )
+            shell = InteractiveShellEmbed(banner2=banner)
+            shell(local_ns=ns)
+        except ImportError:
+            from IPython.Shell import IPShellEmbed
+            shell = IPShellEmbed(argv=self.args)
+            shell.set_banner(shell.IP.BANNER + '\n\n' + banner)
+            shell(local_ns=ns, global_ns={})
+
+
 class ShellCommand(BaseCommand):
     """
     Open an interactive shell with the Pecan app loaded.
     """
 
+    SHELLS = {
+        'python': NativePythonShell,
+        'ipython': IPythonShell
+    }    
+
+    arguments = BaseCommand.arguments + ({
+        'command': '--shell',
+        'help': 'which Python shell to use',
+        'choices': SHELLS.keys(),
+        'default': 'python'
+    },)
+
     def run(self, args):
         super(ShellCommand, self).run(args)
 
@@ -44,23 +90,21 @@ class ShellCommand(BaseCommand):
             )
             banner += '  %-10s - Models from %s\n' % ('model', model_name)
 
-        # launch the shell, using IPython if available
+        self.invoke_shell(locs, banner)
+
+    def invoke_shell(self, locs, banner):
+        shell = self.SHELLS[self.args.shell]
         try:
-            from IPython.Shell import IPShellEmbed
-            shell = IPShellEmbed(argv=self.args)
-            shell.set_banner(shell.IP.BANNER + '\n\n' + banner)
-            shell(local_ns=locs, global_ns={})
-        except ImportError:
-            import code
-            py_prefix = sys.platform.startswith('java') and 'J' or 'P'
-            shell_banner = 'Pecan Interactive Shell\n%sython %s\n\n' % \
-                (py_prefix, sys.version)
-            shell = code.InteractiveConsole(locals=locs)
-            try:
-                import readline  # noqa
-            except ImportError:
-                pass
-            shell.interact(shell_banner + banner)
+            shell().invoke(locs, banner)
+        except ImportError, e:
+            warn(
+                ("%s is not installed, `%s`, "
+                "falling back to native shell") % (self.args.shell, e),
+                RuntimeWarning
+            )
+            if shell == NativePythonShell:
+                raise
+            NativePythonShell().invoke(locs, banner)
 
     def load_model(self, config):
         for package_name in getattr(config.app, 'modules', []):

setup.py

@@ -76,11 +76,8 @@ setup(
         'Operating System :: Microsoft :: Windows',
         'Operating System :: POSIX',
         'Programming Language :: Python',
-        'Programming Language :: Python :: 2.5',
         'Programming Language :: Python :: 2.6',
         'Programming Language :: Python :: 2.7',
-        'Programming Language :: Python :: 3.2',
-        'Programming Language :: Python :: Implementation :: PyPy',
         'Topic :: Internet :: WWW/HTTP :: WSGI',
         'Topic :: Software Development :: Libraries :: Application Frameworks'
     ],