|
|
"""
|
|
|
``autoreload`` is an IPython extension that reloads modules
|
|
|
automatically before executing the line of code typed.
|
|
|
|
|
|
This makes for example the following workflow possible:
|
|
|
|
|
|
.. sourcecode:: ipython
|
|
|
|
|
|
In [1]: %load_ext autoreload
|
|
|
|
|
|
In [2]: %autoreload 2
|
|
|
|
|
|
In [3]: from foo import some_function
|
|
|
|
|
|
In [4]: some_function()
|
|
|
Out[4]: 42
|
|
|
|
|
|
In [5]: # open foo.py in an editor and change some_function to return 43
|
|
|
|
|
|
In [6]: some_function()
|
|
|
Out[6]: 43
|
|
|
|
|
|
The module was reloaded without reloading it explicitly, and the
|
|
|
object imported with ``from foo import ...`` was also updated.
|
|
|
|
|
|
Usage
|
|
|
=====
|
|
|
|
|
|
The following magic commands are provided:
|
|
|
|
|
|
``%autoreload``
|
|
|
|
|
|
Reload all modules (except those excluded by ``%aimport``)
|
|
|
automatically now.
|
|
|
|
|
|
``%autoreload 0``
|
|
|
|
|
|
Disable automatic reloading.
|
|
|
|
|
|
``%autoreload 1``
|
|
|
|
|
|
Reload all modules imported with ``%aimport`` every time before
|
|
|
executing the Python code typed.
|
|
|
|
|
|
``%autoreload 2``
|
|
|
|
|
|
Reload all modules (except those excluded by ``%aimport``) every
|
|
|
time before executing the Python code typed.
|
|
|
|
|
|
``%aimport``
|
|
|
|
|
|
List modules which are to be automatically imported or not to be imported.
|
|
|
|
|
|
``%aimport foo``
|
|
|
|
|
|
Import module 'foo' and mark it to be autoreloaded for ``%autoreload 1``
|
|
|
|
|
|
``%aimport -foo``
|
|
|
|
|
|
Mark module 'foo' to not be autoreloaded.
|
|
|
|
|
|
Caveats
|
|
|
=======
|
|
|
|
|
|
Reloading Python modules in a reliable way is in general difficult,
|
|
|
and unexpected things may occur. ``%autoreload`` tries to work around
|
|
|
common pitfalls by replacing function code objects and parts of
|
|
|
classes previously in the module with new versions. This makes the
|
|
|
following things to work:
|
|
|
|
|
|
- Functions and classes imported via 'from xxx import foo' are upgraded
|
|
|
to new versions when 'xxx' is reloaded.
|
|
|
|
|
|
- Methods and properties of classes are upgraded on reload, so that
|
|
|
calling 'c.foo()' on an object 'c' created before the reload causes
|
|
|
the new code for 'foo' to be executed.
|
|
|
|
|
|
Some of the known remaining caveats are:
|
|
|
|
|
|
- Replacing code objects does not always succeed: changing a @property
|
|
|
in a class to an ordinary method or a method to a member variable
|
|
|
can cause problems (but in old objects only).
|
|
|
|
|
|
- Functions that are removed (eg. via monkey-patching) from a module
|
|
|
before it is reloaded are not upgraded.
|
|
|
|
|
|
- C extension modules cannot be reloaded, and so cannot be
|
|
|
autoreloaded.
|
|
|
|
|
|
"""
|
|
|
|
|
|
skip_doctest = True
|
|
|
|
|
|
# Pauli Virtanen <pav@iki.fi>, 2008.
|
|
|
# Thomas Heller, 2000.
|
|
|
#
|
|
|
# This IPython module is written by Pauli Virtanen, based on the autoreload
|
|
|
# code by Thomas Heller.
|
|
|
|
|
|
#------------------------------------------------------------------------------
|
|
|
# Autoreload functionality
|
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
import time, os, threading, sys, types, imp, inspect, traceback, atexit
|
|
|
import weakref
|
|
|
try:
|
|
|
reload
|
|
|
except NameError:
|
|
|
from imp import reload
|
|
|
|
|
|
def _get_compiled_ext():
|
|
|
"""Official way to get the extension of compiled files (.pyc or .pyo)"""
|
|
|
for ext, mode, typ in imp.get_suffixes():
|
|
|
if typ == imp.PY_COMPILED:
|
|
|
return ext
|
|
|
|
|
|
PY_COMPILED_EXT = _get_compiled_ext()
|
|
|
|
|
|
class ModuleReloader(object):
|
|
|
enabled = False
|
|
|
"""Whether this reloader is enabled"""
|
|
|
|
|
|
failed = {}
|
|
|
"""Modules that failed to reload: {module: mtime-on-failed-reload, ...}"""
|
|
|
|
|
|
modules = {}
|
|
|
"""Modules specially marked as autoreloadable."""
|
|
|
|
|
|
skip_modules = {}
|
|
|
"""Modules specially marked as not autoreloadable."""
|
|
|
|
|
|
check_all = True
|
|
|
"""Autoreload all modules, not just those listed in 'modules'"""
|
|
|
|
|
|
old_objects = {}
|
|
|
"""(module-name, name) -> weakref, for replacing old code objects"""
|
|
|
|
|
|
def mark_module_skipped(self, module_name):
|
|
|
"""Skip reloading the named module in the future"""
|
|
|
try:
|
|
|
del self.modules[module_name]
|
|
|
except KeyError:
|
|
|
pass
|
|
|
self.skip_modules[module_name] = True
|
|
|
|
|
|
def mark_module_reloadable(self, module_name):
|
|
|
"""Reload the named module in the future (if it is imported)"""
|
|
|
try:
|
|
|
del self.skip_modules[module_name]
|
|
|
except KeyError:
|
|
|
pass
|
|
|
self.modules[module_name] = True
|
|
|
|
|
|
def aimport_module(self, module_name):
|
|
|
"""Import a module, and mark it reloadable
|
|
|
|
|
|
Returns
|
|
|
-------
|
|
|
top_module : module
|
|
|
The imported module if it is top-level, or the top-level
|
|
|
top_name : module
|
|
|
Name of top_module
|
|
|
|
|
|
"""
|
|
|
self.mark_module_reloadable(module_name)
|
|
|
|
|
|
__import__(module_name)
|
|
|
top_name = module_name.split('.')[0]
|
|
|
top_module = sys.modules[top_name]
|
|
|
return top_module, top_name
|
|
|
|
|
|
def check(self, check_all=False):
|
|
|
"""Check whether some modules need to be reloaded."""
|
|
|
|
|
|
if not self.enabled and not check_all:
|
|
|
return
|
|
|
|
|
|
if check_all or self.check_all:
|
|
|
modules = sys.modules.keys()
|
|
|
else:
|
|
|
modules = self.modules.keys()
|
|
|
|
|
|
for modname in modules:
|
|
|
m = sys.modules.get(modname, None)
|
|
|
|
|
|
if modname in self.skip_modules:
|
|
|
continue
|
|
|
|
|
|
if not hasattr(m, '__file__'):
|
|
|
continue
|
|
|
|
|
|
if m.__name__ == '__main__':
|
|
|
# we cannot reload(__main__)
|
|
|
continue
|
|
|
|
|
|
filename = m.__file__
|
|
|
path, ext = os.path.splitext(filename)
|
|
|
|
|
|
if ext.lower() == '.py':
|
|
|
ext = PY_COMPILED_EXT
|
|
|
pyc_filename = path + PY_COMPILED_EXT
|
|
|
py_filename = filename
|
|
|
else:
|
|
|
pyc_filename = filename
|
|
|
py_filename = filename[:-1]
|
|
|
|
|
|
if ext != PY_COMPILED_EXT:
|
|
|
continue
|
|
|
|
|
|
try:
|
|
|
pymtime = os.stat(py_filename).st_mtime
|
|
|
if pymtime <= os.stat(pyc_filename).st_mtime:
|
|
|
continue
|
|
|
if self.failed.get(py_filename, None) == pymtime:
|
|
|
continue
|
|
|
except OSError:
|
|
|
continue
|
|
|
|
|
|
try:
|
|
|
superreload(m, reload, self.old_objects)
|
|
|
if py_filename in self.failed:
|
|
|
del self.failed[py_filename]
|
|
|
except:
|
|
|
print >> sys.stderr, "[autoreload of %s failed: %s]" % (
|
|
|
modname, traceback.format_exc(1))
|
|
|
self.failed[py_filename] = pymtime
|
|
|
|
|
|
#------------------------------------------------------------------------------
|
|
|
# superreload
|
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
def update_function(old, new):
|
|
|
"""Upgrade the code object of a function"""
|
|
|
for name in ['func_code', 'func_defaults', 'func_doc',
|
|
|
'func_closure', 'func_globals', 'func_dict']:
|
|
|
try:
|
|
|
setattr(old, name, getattr(new, name))
|
|
|
except (AttributeError, TypeError):
|
|
|
pass
|
|
|
|
|
|
def update_class(old, new):
|
|
|
"""Replace stuff in the __dict__ of a class, and upgrade
|
|
|
method code objects"""
|
|
|
for key in old.__dict__.keys():
|
|
|
old_obj = getattr(old, key)
|
|
|
|
|
|
try:
|
|
|
new_obj = getattr(new, key)
|
|
|
except AttributeError:
|
|
|
# obsolete attribute: remove it
|
|
|
try:
|
|
|
delattr(old, key)
|
|
|
except (AttributeError, TypeError):
|
|
|
pass
|
|
|
continue
|
|
|
|
|
|
if update_generic(old_obj, new_obj): continue
|
|
|
|
|
|
try:
|
|
|
setattr(old, key, getattr(new, key))
|
|
|
except (AttributeError, TypeError):
|
|
|
pass # skip non-writable attributes
|
|
|
|
|
|
def update_property(old, new):
|
|
|
"""Replace get/set/del functions of a property"""
|
|
|
update_generic(old.fdel, new.fdel)
|
|
|
update_generic(old.fget, new.fget)
|
|
|
update_generic(old.fset, new.fset)
|
|
|
|
|
|
def isinstance2(a, b, typ):
|
|
|
return isinstance(a, typ) and isinstance(b, typ)
|
|
|
|
|
|
UPDATE_RULES = [
|
|
|
(lambda a, b: isinstance2(a, b, types.ClassType),
|
|
|
update_class),
|
|
|
(lambda a, b: isinstance2(a, b, types.TypeType),
|
|
|
update_class),
|
|
|
(lambda a, b: isinstance2(a, b, types.FunctionType),
|
|
|
update_function),
|
|
|
(lambda a, b: isinstance2(a, b, property),
|
|
|
update_property),
|
|
|
(lambda a, b: isinstance2(a, b, types.MethodType),
|
|
|
lambda a, b: update_function(a.im_func, b.im_func)),
|
|
|
]
|
|
|
|
|
|
def update_generic(a, b):
|
|
|
for type_check, update in UPDATE_RULES:
|
|
|
if type_check(a, b):
|
|
|
update(a, b)
|
|
|
return True
|
|
|
return False
|
|
|
|
|
|
class StrongRef(object):
|
|
|
def __init__(self, obj):
|
|
|
self.obj = obj
|
|
|
def __call__(self):
|
|
|
return self.obj
|
|
|
|
|
|
def superreload(module, reload=reload, old_objects={}):
|
|
|
"""Enhanced version of the builtin reload function.
|
|
|
|
|
|
superreload remembers objects previously in the module, and
|
|
|
|
|
|
- upgrades the class dictionary of every old class in the module
|
|
|
- upgrades the code object of every old function and method
|
|
|
- clears the module's namespace before reloading
|
|
|
|
|
|
"""
|
|
|
|
|
|
# collect old objects in the module
|
|
|
for name, obj in module.__dict__.items():
|
|
|
if not hasattr(obj, '__module__') or obj.__module__ != module.__name__:
|
|
|
continue
|
|
|
key = (module.__name__, name)
|
|
|
try:
|
|
|
old_objects.setdefault(key, []).append(weakref.ref(obj))
|
|
|
except TypeError:
|
|
|
# weakref doesn't work for all types;
|
|
|
# create strong references for 'important' cases
|
|
|
if isinstance(obj, types.ClassType):
|
|
|
old_objects.setdefault(key, []).append(StrongRef(obj))
|
|
|
|
|
|
# reload module
|
|
|
try:
|
|
|
# clear namespace first from old cruft
|
|
|
old_dict = module.__dict__.copy()
|
|
|
old_name = module.__name__
|
|
|
module.__dict__.clear()
|
|
|
module.__dict__['__name__'] = old_name
|
|
|
except (TypeError, AttributeError, KeyError):
|
|
|
pass
|
|
|
|
|
|
try:
|
|
|
module = reload(module)
|
|
|
except:
|
|
|
# restore module dictionary on failed reload
|
|
|
module.__dict__.update(old_dict)
|
|
|
raise
|
|
|
|
|
|
# iterate over all objects and update functions & classes
|
|
|
for name, new_obj in module.__dict__.items():
|
|
|
key = (module.__name__, name)
|
|
|
if key not in old_objects: continue
|
|
|
|
|
|
new_refs = []
|
|
|
for old_ref in old_objects[key]:
|
|
|
old_obj = old_ref()
|
|
|
if old_obj is None: continue
|
|
|
new_refs.append(old_ref)
|
|
|
update_generic(old_obj, new_obj)
|
|
|
|
|
|
if new_refs:
|
|
|
old_objects[key] = new_refs
|
|
|
else:
|
|
|
del old_objects[key]
|
|
|
|
|
|
return module
|
|
|
|
|
|
#------------------------------------------------------------------------------
|
|
|
# IPython connectivity
|
|
|
#------------------------------------------------------------------------------
|
|
|
|
|
|
from IPython.core.plugin import Plugin
|
|
|
from IPython.core.hooks import TryNext
|
|
|
|
|
|
class AutoreloadInterface(object):
|
|
|
def __init__(self, *a, **kw):
|
|
|
super(AutoreloadInterface, self).__init__(*a, **kw)
|
|
|
self._reloader = ModuleReloader()
|
|
|
self._reloader.check_all = False
|
|
|
|
|
|
def magic_autoreload(self, ipself, parameter_s=''):
|
|
|
r"""%autoreload => Reload modules automatically
|
|
|
|
|
|
%autoreload
|
|
|
Reload all modules (except those excluded by %aimport) automatically
|
|
|
now.
|
|
|
|
|
|
%autoreload 0
|
|
|
Disable automatic reloading.
|
|
|
|
|
|
%autoreload 1
|
|
|
Reload all modules imported with %aimport every time before executing
|
|
|
the Python code typed.
|
|
|
|
|
|
%autoreload 2
|
|
|
Reload all modules (except those excluded by %aimport) every time
|
|
|
before executing the Python code typed.
|
|
|
|
|
|
Reloading Python modules in a reliable way is in general
|
|
|
difficult, and unexpected things may occur. %autoreload tries to
|
|
|
work around common pitfalls by replacing function code objects and
|
|
|
parts of classes previously in the module with new versions. This
|
|
|
makes the following things to work:
|
|
|
|
|
|
- Functions and classes imported via 'from xxx import foo' are upgraded
|
|
|
to new versions when 'xxx' is reloaded.
|
|
|
|
|
|
- Methods and properties of classes are upgraded on reload, so that
|
|
|
calling 'c.foo()' on an object 'c' created before the reload causes
|
|
|
the new code for 'foo' to be executed.
|
|
|
|
|
|
Some of the known remaining caveats are:
|
|
|
|
|
|
- Replacing code objects does not always succeed: changing a @property
|
|
|
in a class to an ordinary method or a method to a member variable
|
|
|
can cause problems (but in old objects only).
|
|
|
|
|
|
- Functions that are removed (eg. via monkey-patching) from a module
|
|
|
before it is reloaded are not upgraded.
|
|
|
|
|
|
- C extension modules cannot be reloaded, and so cannot be
|
|
|
autoreloaded.
|
|
|
|
|
|
"""
|
|
|
if parameter_s == '':
|
|
|
self._reloader.check(True)
|
|
|
elif parameter_s == '0':
|
|
|
self._reloader.enabled = False
|
|
|
elif parameter_s == '1':
|
|
|
self._reloader.check_all = False
|
|
|
self._reloader.enabled = True
|
|
|
elif parameter_s == '2':
|
|
|
self._reloader.check_all = True
|
|
|
self._reloader.enabled = True
|
|
|
|
|
|
def magic_aimport(self, ipself, parameter_s='', stream=None):
|
|
|
"""%aimport => Import modules for automatic reloading.
|
|
|
|
|
|
%aimport
|
|
|
List modules to automatically import and not to import.
|
|
|
|
|
|
%aimport foo
|
|
|
Import module 'foo' and mark it to be autoreloaded for %autoreload 1
|
|
|
|
|
|
%aimport -foo
|
|
|
Mark module 'foo' to not be autoreloaded for %autoreload 1
|
|
|
|
|
|
"""
|
|
|
|
|
|
modname = parameter_s
|
|
|
if not modname:
|
|
|
to_reload = self._reloader.modules.keys()
|
|
|
to_reload.sort()
|
|
|
to_skip = self._reloader.skip_modules.keys()
|
|
|
to_skip.sort()
|
|
|
if stream is None:
|
|
|
stream = sys.stdout
|
|
|
if self._reloader.check_all:
|
|
|
stream.write("Modules to reload:\nall-except-skipped\n")
|
|
|
else:
|
|
|
stream.write("Modules to reload:\n%s\n" % ' '.join(to_reload))
|
|
|
stream.write("\nModules to skip:\n%s\n" % ' '.join(to_skip))
|
|
|
elif modname.startswith('-'):
|
|
|
modname = modname[1:]
|
|
|
self._reloader.mark_module_skipped(modname)
|
|
|
else:
|
|
|
top_module, top_name = self._reloader.aimport_module(modname)
|
|
|
|
|
|
# Inject module to user namespace
|
|
|
ipself.push({top_name: top_module})
|
|
|
|
|
|
def pre_run_code_hook(self, ipself):
|
|
|
if not self._reloader.enabled:
|
|
|
raise TryNext
|
|
|
try:
|
|
|
self._reloader.check()
|
|
|
except:
|
|
|
pass
|
|
|
|
|
|
class AutoreloadPlugin(AutoreloadInterface, Plugin):
|
|
|
def __init__(self, shell=None, config=None):
|
|
|
super(AutoreloadPlugin, self).__init__(shell=shell, config=config)
|
|
|
|
|
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self.shell.define_magic('autoreload', self.magic_autoreload)
|
|
|
self.shell.define_magic('aimport', self.magic_aimport)
|
|
|
self.shell.set_hook('pre_run_code_hook', self.pre_run_code_hook)
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|
|
|
|
|
_loaded = False
|
|
|
|
|
|
def load_ipython_extension(ip):
|
|
|
"""Load the extension in IPython."""
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|
|
global _loaded
|
|
|
if not _loaded:
|
|
|
plugin = AutoreloadPlugin(shell=ip, config=ip.config)
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|
|
ip.plugin_manager.register_plugin('autoreload', plugin)
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|
|
_loaded = True
|
|
|
|
