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91 lines
2 KiB
Python
91 lines
2 KiB
Python
# A generic class to build line-oriented command interpreters
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import string
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import sys
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import linecache
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PROMPT = '(Cmd) '
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IDENTCHARS = string.letters + string.digits + '_'
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class Cmd:
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def __init__(self):
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self.prompt = PROMPT
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self.identchars = IDENTCHARS
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self.lastcmd = ''
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def cmdloop(self):
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stop = None
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while not stop:
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try:
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line = raw_input(self.prompt)
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except EOFError:
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line = 'EOF'
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stop = self.onecmd(line)
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def onecmd(self, line):
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line = string.strip(line)
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if not line:
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line = self.lastcmd
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else:
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self.lastcmd = line
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i, n = 0, len(line)
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while i < n and line[i] in self.identchars: i = i+1
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cmd, arg = line[:i], string.strip(line[i:])
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if cmd == '':
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return self.default(line)
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else:
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try:
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func = getattr(self, 'do_' + cmd)
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except AttributeError:
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return self.default(line)
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return func(arg)
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def default(self, line):
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print '*** Unknown syntax:', line
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def do_help(self, arg):
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if arg:
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# XXX check arg syntax
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try:
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func = getattr(self, 'help_' + arg)
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except:
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print '*** No help on', `arg`
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return
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func()
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else:
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import newdir
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names = newdir.dir(self.__class__)
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cmds_doc = []
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cmds_undoc = []
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help = {}
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for name in names:
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if name[:5] == 'help_':
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help[name[5:]]=1
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for name in names:
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if name[:3] == 'do_':
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cmd=name[3:]
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if help.has_key(cmd):
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cmds_doc.append(cmd)
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del help[cmd]
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else:
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cmds_undoc.append(cmd)
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print
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self.print_topics("Documented commands (type help " \
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"<topic>):",cmds_doc, 15, 80)
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self.print_topics("Miscellaneous help topics:",
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help.keys(), 15, 80)
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self.print_topics("Undocumented commands:",
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cmds_undoc, 15, 80)
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def print_topics(self, header, cmds, cmdlen, maxcol):
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if cmds:
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print header;
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print "="*len(header)
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(cmds_per_line,junk)=divmod(maxcol,cmdlen)
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col=cmds_per_line
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for cmd in cmds:
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if col==0: print
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print (("%-"+`cmdlen`+"s") % cmd),
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col = (col+1) % cmds_per_line
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print "\n"
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