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import os, traceback
class ScriptError(Exception):
pass
class Script:
"""
The instantiator should do something along this vein:
s = Script(argv, master)
s.load()
"""
def __init__(self, argv, ctx):
self.argv = argv
self.ctx = 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.argv[0])
if not os.path.exists(path):
raise ScriptError("No such file: %s" % path)
if not os.path.isfile(path):
raise ScriptError("Not a file: %s" % path)
ns = {}
try:
execfile(path, ns, ns)
except Exception, v:
raise ScriptError(traceback.format_exc(v))
self.ns = ns
r = self.run("start", self.argv)
if not r[0] and r[1]:
raise ScriptError(r[1][1])
def unload(self):
return self.run("done")
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)
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