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import imp, os, traceback
class ScriptError(Exception):
pass
class Context:
def __init__(self, master, state):
self.master, self.state = master, state
def log(self, *args, **kwargs):
self.master.add_event(*args, **kwargs)
class Script:
"""
The instantiator should do something along this vein:
s = Script(path, master)
s.load()
s.run("start")
"""
def __init__(self, path, master):
self.path = path
self.ctx = Context(master, master.state)
self.mod = None
self.ns = None
def load(self):
"""
Loads a module.
Raises ScriptError on failure, with argument equal to an error
message that may be a formatted traceback.
"""
path = os.path.expanduser(self.path)
if not os.path.exists(path):
raise ScriptError("No such file: %s"%self.path)
if not os.path.isfile(path):
raise ScriptError("Not a file: %s"%self.path)
ns = {}
try:
self.mod = execfile(path, ns, ns)
except Exception, v:
raise ScriptError(traceback.format_exc(v))
self.ns = ns
def run(self, name, *args, **kwargs):
"""
Runs a plugin method.
Returns:
(True, retval) on success.
(False, None) on nonexistent method.
(Fals, (exc, traceback string)) if there was an exception.
"""
f = self.ns.get(name)
if f:
try:
return (True, f(self.ctx, *args, **kwargs))
except Exception, v:
return (False, (v, traceback.format_exc(v)))
else:
return (False, None)
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