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# $Header: /var/local/cvsroot/4Suite/Ft/Server/Client/Commands/CommandUtil.py,v 1.11 2005/03/19 10:41:16 jkloth Exp $
"""
Functions used by various '4ss' command implementations.
Copyright 2004 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
import sys
from Ft.Lib import Wrap
from Ft.Server.Client import SmartLogin, FtServerClientException
from Ft.Server.Common import AclConstants
__all__ = ['GetRepository', 'WritePreamble']
def GetRepository(options, cmdName):
"""
Given an options dictionary and the name of a command, uses the
options in an attempt to obtain a repository access object, then
verifies that the user attempting the access has execute access
on the corresopnding Command resource in the repository. If
successful, returns the repository access object. Otherwise,
prints an exception message to standard error and returns None.
"""
repo = None
try:
repo = SmartLogin(options)
if cmdName is not None:
cmd = repo.getCommand(cmdName)
if cmd is None:
raise ValueError("Unknown Command: " + cmdName)
cmd.verifyAcl(AclConstants.EXECUTE_ACCESS,0)
except FtServerClientException, e:
sys.stderr.write(str(e)+'\n')
sys.stderr.flush()
repo = None
return repo
def WritePreamble(heading, uchar='=', maxwidth=None, stream=sys.stderr):
"""
Commands that need to preface their output with a preamble can
use this function to write it to the output stream (a file-like
object) in a consistent way. The given heading will be wrapped
if necessary to fit within a maximum width, then will be written
out, followed by a row a underline characters that is as wide
as the widest line in the heading.
"""
lines = heading.split('\n')
longest_len = max(map(lambda s: len(s), lines))
if maxwidth and maxwidth > 0 and longest_len >= maxwidth:
heading = Wrap(heading, maxwidth)
longest_len = max(map(lambda s: len(s), heading.split('\n')))
stream.write(heading)
if heading[-1] != '\n':
stream.write('\n')
stream.write(uchar * longest_len + '\n')
stream.flush()
return
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