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Define very simple exception classes, mapping to the error functions

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user_error() and unexpected_error().  If archivemail is used as a module, let
the functions raise the corresponding exceptions rather than writing to stderr
and calling sys.exit().
This commit is contained in:
Nikolaus Schulz 2007-10-23 22:27:57 +00:00
parent 255a475978
commit 1493a22f38
1 changed files with 16 additions and 3 deletions
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19
archivemail.py
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@ -75,6 +75,13 @@ from_re = re.compile(r'^From ', re.MULTILINE)
############## class definitions ###############
class ArchivemailException(Exception):
pass
class UserError(ArchivemailException):
pass
class UnexpectedError(ArchivemailException):
pass
class Stats:
"""Class to collect and print statistics about mailbox archival"""
__archived = 0
@ -696,8 +703,11 @@ def vprint(string):
def unexpected_error(string):
"""Print the string argument, a 'shutting down' message and abort -
this function never returns"""
"""Print the string argument, a 'shutting down' message and abort. Raise
UnexpectedErrors if archivemail is run as a module. This function never
returns."""
if not __name__ == '__main__':
raise UnexpectedError(string)
sys.stderr.write("%s: %s\n" % (options.script_name, string))
sys.stderr.write("%s: unexpected error encountered - shutting down\n" %
options.script_name)
@ -705,7 +715,10 @@ def unexpected_error(string):
def user_error(string):
"""Print the string argument and abort - this function never returns"""
"""Print the string argument and abort. Raise UserError if archivemail is
run as a module. This function never returns."""
if not __name__ == '__main__':
raise UserError(string)
sys.stderr.write("%s: %s\n" % (options.script_name, string))
sys.exit(1)