import os, traceback class ScriptError(Exception): pass class Script: """ The instantiator should do something along this vein: s = Script(path, master) s.load() s.run("start") """ def __init__(self, path, ctx): self.path, self.ctx = path, ctx 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: 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. (False, (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)