arguments.py

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"""
CAT usage :

cat.py [-o <...> --options<=...>] <script>

  -b / --banner [True]   : no banner at startup
  -i / --file   <file>   : load a python initialisation script file <filename>
  -q / --quit   [False]  : stop after script execution
  -h / --help            : print out this message
  -g / --gui             : starts cat in gui mode
  -o / --output <level>  : set the requested output level
                  level=VERBOSE, DEBUG, INFO, WARNING, FATAL
  -s / --shell  [True]  : starts cat shell session
  -v / --version         : print out version number
"""

import os, sys, getopt, code
import version

class arguments:
    def __init__(self, argv=None):
        self.banner=False
        self.file=""
        self.bkgMode=False
        self.output="INFO"
        self.shellMode=True
        self.decode(argv)

    def decode(self, argv):
        if argv==None:
                argv = sys.argv
        # parse command line options
        try:
            try:
                opts, args = getopt.getopt(argv[1:],"bf:ghqo:sv",
                                           ["banner","file=","gui","help","quit","output=","shell","version"])
            except getopt.error, msg:
                raise Usage(msg)
            # check argument
            if (len(args)>2):
                raise Usage("Too many arguments.")
            vers=version.version()
            # process options
            for o, a in opts:
                if o in ("-b", "--banner"):
                    self.banner=False
                if o in ("-f", "--file"):
                    self.file=a
                    if (False==os.path.exists(a)):
                        raise Usage("File "+a+" does not exists.")
                        return 2
                if o in ("-g", "--gui"):
                    self.shellMode=False
                    return
                if o in ("-h", "--help"):
                    print __doc__
                    return 2
                if o in ("-s", "--shell"):
                    self.shellMode=True
                    return
                if o in ("-q", "--quit"):
                    print "Not implemented."
                    return 2
                if o in ("-o", "--output"):
                    self.output=a
                    return
                if o in ("-v", "--version"):
                    vers.info()
                    return 2
        except Usage, err:
            print >>sys.stderr, err.msg
            print __doc__

    def printout(self):
        print "Cat options are : "
        if (self.banner):
            print "   Banner          : True"
        else:
            print "   Banner          : False"
        print "   File            =",self.file
        if (self.bkgMode):
            print "   Background mode : True"
        else:
            print "   Background mode : False"
        print "   OutputLevel     =",self.output
        if (self.shellMode):
            print "   Shell mode      : True"
        else:
            print "   Shell mode      : False"


class Usage(Exception):
    def __init__(self, msg):
        self.msg = msg