1992-01-24 01:12:17 +00:00
|
|
|
# A generic class to build line-oriented command interpreters
|
1998-06-29 17:58:55 +00:00
|
|
|
#
|
|
|
|
# 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.
|
|
|
|
#
|
|
|
|
# The `default' method may be overridden to intercept commands for which there
|
|
|
|
# is no do_ 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.
|
|
|
|
#
|
1992-01-24 01:12:17 +00:00
|
|
|
|
|
|
|
import string
|
|
|
|
import sys
|
|
|
|
import linecache
|
|
|
|
|
|
|
|
PROMPT = '(Cmd) '
|
|
|
|
IDENTCHARS = string.letters + string.digits + '_'
|
|
|
|
|
|
|
|
class Cmd:
|
1998-06-29 17:58:55 +00:00
|
|
|
prompt = PROMPT
|
|
|
|
identchars = IDENTCHARS
|
|
|
|
ruler = '='
|
|
|
|
lastcmd = ''
|
|
|
|
intro = None
|
|
|
|
doc_header = "Documented commands (type help <topic>):"
|
|
|
|
misc_header = "Miscellaneous help topics:"
|
|
|
|
undoc_header = "Undocumented commands:"
|
1993-06-20 21:02:22 +00:00
|
|
|
|
1998-07-01 22:53:04 +00:00
|
|
|
def __init__(self): pass
|
|
|
|
|
1998-06-29 17:58:55 +00:00
|
|
|
def cmdloop(self, intro=None):
|
|
|
|
self.preloop()
|
|
|
|
if intro != None:
|
|
|
|
self.intro = intro
|
|
|
|
if self.intro:
|
|
|
|
print self.intro
|
1992-01-24 01:12:17 +00:00
|
|
|
stop = None
|
|
|
|
while not stop:
|
|
|
|
try:
|
|
|
|
line = raw_input(self.prompt)
|
|
|
|
except EOFError:
|
|
|
|
line = 'EOF'
|
1998-06-29 17:58:55 +00:00
|
|
|
self.precmd()
|
1992-01-24 01:12:17 +00:00
|
|
|
stop = self.onecmd(line)
|
1998-06-29 17:58:55 +00:00
|
|
|
self.postcmd()
|
|
|
|
self.postloop()
|
|
|
|
|
|
|
|
def precmd(self):
|
|
|
|
pass
|
|
|
|
|
|
|
|
def postcmd(self):
|
|
|
|
pass
|
|
|
|
|
|
|
|
def preloop(self):
|
|
|
|
pass
|
|
|
|
|
|
|
|
def postloop(self):
|
|
|
|
pass
|
1992-01-24 01:12:17 +00:00
|
|
|
|
|
|
|
def onecmd(self, line):
|
|
|
|
line = string.strip(line)
|
1998-06-29 17:58:55 +00:00
|
|
|
if line == '?':
|
|
|
|
line = 'help'
|
|
|
|
elif line == '!':
|
|
|
|
if hasattr(self, 'do_shell'):
|
|
|
|
line = 'shell'
|
|
|
|
else:
|
|
|
|
self.default(line)
|
|
|
|
return
|
|
|
|
elif not line:
|
|
|
|
self.emptyline()
|
|
|
|
return
|
|
|
|
self.lastcmd = line
|
1992-01-24 01:12:17 +00:00
|
|
|
i, n = 0, len(line)
|
|
|
|
while i < n and line[i] in self.identchars: i = i+1
|
|
|
|
cmd, arg = line[:i], string.strip(line[i:])
|
|
|
|
if cmd == '':
|
|
|
|
return self.default(line)
|
|
|
|
else:
|
|
|
|
try:
|
1992-11-05 10:43:02 +00:00
|
|
|
func = getattr(self, 'do_' + cmd)
|
1992-01-24 01:12:17 +00:00
|
|
|
except AttributeError:
|
|
|
|
return self.default(line)
|
|
|
|
return func(arg)
|
|
|
|
|
1998-06-29 17:58:55 +00:00
|
|
|
def emptyline(self):
|
|
|
|
return self.onecmd(self.lastcmd)
|
|
|
|
|
1992-01-24 01:12:17 +00:00
|
|
|
def default(self, line):
|
|
|
|
print '*** Unknown syntax:', line
|
|
|
|
|
|
|
|
def do_help(self, arg):
|
|
|
|
if arg:
|
|
|
|
# XXX check arg syntax
|
|
|
|
try:
|
1992-11-05 10:43:02 +00:00
|
|
|
func = getattr(self, 'help_' + arg)
|
1992-01-24 01:12:17 +00:00
|
|
|
except:
|
|
|
|
print '*** No help on', `arg`
|
|
|
|
return
|
|
|
|
func()
|
|
|
|
else:
|
1998-05-22 14:11:57 +00:00
|
|
|
names = dir(self.__class__)
|
1994-08-01 11:34:53 +00:00
|
|
|
cmds_doc = []
|
|
|
|
cmds_undoc = []
|
|
|
|
help = {}
|
|
|
|
for name in names:
|
|
|
|
if name[:5] == 'help_':
|
|
|
|
help[name[5:]]=1
|
1992-01-24 01:12:17 +00:00
|
|
|
for name in names:
|
|
|
|
if name[:3] == 'do_':
|
1994-08-01 11:34:53 +00:00
|
|
|
cmd=name[3:]
|
|
|
|
if help.has_key(cmd):
|
|
|
|
cmds_doc.append(cmd)
|
|
|
|
del help[cmd]
|
|
|
|
else:
|
|
|
|
cmds_undoc.append(cmd)
|
|
|
|
print
|
1998-06-29 17:58:55 +00:00
|
|
|
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)
|
1994-08-01 11:34:53 +00:00
|
|
|
|
|
|
|
def print_topics(self, header, cmds, cmdlen, maxcol):
|
|
|
|
if cmds:
|
|
|
|
print header;
|
1998-06-29 17:58:55 +00:00
|
|
|
if self.ruler:
|
|
|
|
print self.ruler * len(header)
|
1994-08-01 11:34:53 +00:00
|
|
|
(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"
|