Mercurial > cpython-lru_cache-weakref

annotate Lib/cmd.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 1940892d2fe3
children c9e3ce8e74b5
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1 # A generic class to build line-oriented command interpreters
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2
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3 import string
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4 import sys
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5 import linecache
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6
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7 PROMPT = '(Cmd) '
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8 IDENTCHARS = string.letters + string.digits + '_'
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9
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10 class Cmd:
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11
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12 def __init__(self):
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13 self.prompt = PROMPT
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14 self.identchars = IDENTCHARS
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15 self.lastcmd = ''
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16
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17 def cmdloop(self):
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18 stop = None
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19 while not stop:
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20 try:
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21 line = raw_input(self.prompt)
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22 except EOFError:
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23 line = 'EOF'
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24 stop = self.onecmd(line)
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25
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26 def onecmd(self, line):
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27 line = string.strip(line)
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28 if not line:
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29 line = self.lastcmd
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30 else:
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31 self.lastcmd = line
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32 i, n = 0, len(line)
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33 while i < n and line[i] in self.identchars: i = i+1
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34 cmd, arg = line[:i], string.strip(line[i:])
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35 if cmd == '':
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36 return self.default(line)
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37 else:
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38 try:
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39 func = getattr(self, 'do_' + cmd)
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40 except AttributeError:
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41 return self.default(line)
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42 return func(arg)
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43
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44 def default(self, line):
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45 print '*** Unknown syntax:', line
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46
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47 def do_help(self, arg):
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48 if arg:
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49 # XXX check arg syntax
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50 try:
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51 func = getattr(self, 'help_' + arg)
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52 except:
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53 print '*** No help on', `arg`
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54 return
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55 func()
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56 else:
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57 import newdir
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58 names = newdir.dir(self.__class__)
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59 cmds_doc = []
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60 cmds_undoc = []
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61 help = {}
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62 for name in names:
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63 if name[:5] == 'help_':
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64 help[name[5:]]=1
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65 for name in names:
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66 if name[:3] == 'do_':
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67 cmd=name[3:]
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68 if help.has_key(cmd):
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69 cmds_doc.append(cmd)
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70 del help[cmd]
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71 else:
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72 cmds_undoc.append(cmd)
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73 print
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74 self.print_topics("Documented commands (type help " \
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75 "<topic>):",cmds_doc, 15, 80)
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76 self.print_topics("Miscellaneous help topics:",
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77 help.keys(), 15, 80)
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78 self.print_topics("Undocumented commands:",
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79 cmds_undoc, 15, 80)
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80
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81 def print_topics(self, header, cmds, cmdlen, maxcol):
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82 if cmds:
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83 print header;
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84 print "="*len(header)
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85 (cmds_per_line,junk)=divmod(maxcol,cmdlen)
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86 col=cmds_per_line
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87 for cmd in cmds:
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88 if col==0: print
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89 print (("%-"+`cmdlen`+"s") % cmd),
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90 col = (col+1) % cmds_per_line
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91 print "\n"