cmd.py

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"""A generic class to build line-oriented command interpreters.

Interpreters constructed with this class obey the following conventions:

1. End of file on input is processed as the command 'EOF'.
2. A command is parsed out of each line by collecting the prefix composed
   of characters in the identchars member.
3. A command `foo' is dispatched to a method 'do_foo()'; the do_ method
   is passed a single argument consisting of the remainder of the line.
4. Typing an empty line repeats the last command.  (Actually, it calls the
   method `emptyline', which may be overridden in a subclass.)
5. There is a predefined `help' method.  Given an argument `topic', it
   calls the command `help_topic'.  With no arguments, it lists all topics
   with defined help_ functions, broken into up to three topics; documented
   commands, miscellaneous help topics, and undocumented commands.
6. The command '?' is a synonym for `help'.  The command '!' is a synonym
   for `shell', if a do_shell method exists.
7. If completion is enabled, completing commands will be done automatically,
   and completing of commands args is done by calling complete_foo() with
   arguments text, line, begidx, endidx.  text is string we are matching
   against, all returned matches must begin with it.  line is the current
   input line (lstripped), begidx and endidx are the beginning and end
   indexes of the text being matched, which could be used to provide
   different completion depending upon which position the argument is in.

The `default' method may be overridden to intercept commands for which there
is no do_ method.

The `completedefault' method may be overridden to intercept completions for
commands that have no complete_ method.

The data member `self.ruler' sets the character used to draw separator lines
in the help messages.  If empty, no ruler line is drawn.  It defaults to "=".

If the value of `self.intro' is nonempty when the cmdloop method is called,
it is printed out on interpreter startup.  This value may be overridden
via an optional argument to the cmdloop() method.

The data members `self.doc_header', `self.misc_header', and
`self.undoc_header' set the headers used for the help function's
listings of documented functions, miscellaneous topics, and undocumented
functions respectively.

These interpreters use raw_input; thus, if the readline module is loaded,
they automatically support Emacs-like command history and editing features.
"""

import string, sys

__all__ = ["Cmd"]

PROMPT = '(Cmd) '
IDENTCHARS = string.ascii_letters + string.digits + '_'

class Cmd:
    prompt = PROMPT
    identchars = IDENTCHARS
    ruler = '='
    lastcmd = ''
    cmdqueue = []
    intro = None
    doc_leader = ""
    doc_header = "Documented commands (type help <topic>):"
    misc_header = "Miscellaneous help topics:"
    undoc_header = "Undocumented commands:"
    nohelp = "*** No help on %s"
    use_rawinput = 1

    def __init__(self, completekey='tab'):
        if completekey:
            try:
                import readline
                readline.set_completer(self.complete)
                readline.parse_and_bind(completekey+": complete")
            except ImportError:
                pass

    def cmdloop(self, intro=None):
        self.preloop()
        if intro is not None:
            self.intro = intro
        if self.intro:
            print self.intro
        stop = None
        while not stop:
            if self.cmdqueue:
                line = self.cmdqueue[0]
                del self.cmdqueue[0]
            else:
                if self.use_rawinput:
                    try:
                        line = raw_input(self.prompt)
                    except EOFError:
                        line = 'EOF'
                else:
                    sys.stdout.write(self.prompt)
                    sys.stdout.flush()
                    line = sys.stdin.readline()
                    if not len(line):
                        line = 'EOF'
                    else:
                        line = line[:-1] # chop \n
            line = self.precmd(line)
            stop = self.onecmd(line)
            stop = self.postcmd(stop, line)
        self.postloop()

    def precmd(self, line):
        return line

    def postcmd(self, stop, line):
        return stop

    def preloop(self):
        pass

    def postloop(self):
        pass

    def parseline(self, line):
        line = line.strip()
        if not line:
            return None, None, line
        elif line[0] == '?':
            line = 'help ' + line[1:]
        elif line[0] == '!':
            if hasattr(self, 'do_shell'):
                line = 'shell ' + line[1:]
            else:
                return None, None, line
        i, n = 0, len(line)
        while i < n and line[i] in self.identchars: i = i+1
        cmd, arg = line[:i], line[i:].strip()
        return cmd, arg, line

    def onecmd(self, line):
        cmd, arg, line = self.parseline(line)
        if not line:
            return self.emptyline()
        if cmd is None:
            return self.default(line)
        self.lastcmd = line
        if cmd == '':
            return self.default(line)
        else:
            try:
                func = getattr(self, 'do_' + cmd)
            except AttributeError:
                return self.default(line)
            return func(arg)

    def emptyline(self):
        if self.lastcmd:
            return self.onecmd(self.lastcmd)

    def default(self, line):
        print '*** Unknown syntax:', line

    def completedefault(self, *ignored):
        return []

    def completenames(self, text, *ignored):
        dotext = 'do_'+text
        return [a[3:] for a in self.get_names() if a.startswith(dotext)]

    def complete(self, text, state):
        """Return the next possible completion for 'text'.

        If a command has not been entered, then complete against command list.
        Otherwise try to call complete_<command> to get list of completions.
        """
        if state == 0:
            import readline
            origline = readline.get_line_buffer()
            line = origline.lstrip()
            stripped = len(origline) - len(line)
            begidx = readline.get_begidx() - stripped
            endidx = readline.get_endidx() - stripped
            if begidx>0:
                cmd, args, foo = self.parseline(line)
                if cmd == '':
                    compfunc = self.completedefault
                else:
                    try:
                        compfunc = getattr(self, 'complete_' + cmd)
                    except AttributeError:
                        compfunc = self.completedefault
            else:
                compfunc = self.completenames
            self.completion_matches = compfunc(text, line, begidx, endidx)
        try:
            return self.completion_matches[state]
        except IndexError:
            return None

    def get_names(self):
        # Inheritance says we have to look in class and
        # base classes; order is not important.
        names = []
        classes = [self.__class__]
        while classes:
            aclass = classes[0]
            if aclass.__bases__:
                classes = classes + list(aclass.__bases__)
            names = names + dir(aclass)
            del classes[0]
        return names

    def complete_help(self, *args):
        return self.completenames(*args)

    def do_help(self, arg):
        if arg:
            # XXX check arg syntax
            try:
                func = getattr(self, 'help_' + arg)
            except:
                try:
                    doc=getattr(self, 'do_' + arg).__doc__
                    if doc:
                        print doc
                        return
                except:
                    pass
                print self.nohelp % (arg,)
                return
            func()
        else:
            names = self.get_names()
            cmds_doc = []
            cmds_undoc = []
            help = {}
            for name in names:
                if name[:5] == 'help_':
                    help[name[5:]]=1
            names.sort()
            # There can be duplicates if routines overridden
            prevname = ''
            for name in names:
                if name[:3] == 'do_':
                    if name == prevname:
                        continue
                    prevname = name
                    cmd=name[3:]
                    if help.has_key(cmd):
                        cmds_doc.append(cmd)
                        del help[cmd]
                    elif getattr(self, name).__doc__:
                        cmds_doc.append(cmd)
                    else:
                        cmds_undoc.append(cmd)
            print self.doc_leader
            self.print_topics(self.doc_header,   cmds_doc,   15,80)
            self.print_topics(self.misc_header,  help.keys(),15,80)
            self.print_topics(self.undoc_header, cmds_undoc, 15,80)

    def print_topics(self, header, cmds, cmdlen, maxcol):
        if cmds:
            print header
            if self.ruler:
                print self.ruler * len(header)
            (cmds_per_line,junk)=divmod(maxcol,cmdlen)
            col=cmds_per_line
            for cmd in cmds:
                if col==0: print
                print (("%-"+`cmdlen`+"s") % cmd),
                col = (col+1) % cmds_per_line
            print "\n"