Mercurial > cpython-lru_cache-weakref

annotate Lib/cmd.py @ 73798:6cde416ef03b

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Credit Per Øyvind Karlsen for the initial implementation of the lzma module (issue #6715).
author Nadeem Vawda <nadeem.vawda@gmail.com>
date Thu, 01 Dec 2011 01:18:27 +0200
parents 3c9232a684ae
children b6b4d74b8d42
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 """A generic class to build line-oriented command interpreters.
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2
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3 Interpreters constructed with this class obey the following conventions:
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4
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5 1. End of file on input is processed as the command 'EOF'.
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6 2. A command is parsed out of each line by collecting the prefix composed
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7 of characters in the identchars member.
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8 3. A command `foo' is dispatched to a method 'do_foo()'; the do_ method
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9 is passed a single argument consisting of the remainder of the line.
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10 4. Typing an empty line repeats the last command. (Actually, it calls the
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11 method `emptyline', which may be overridden in a subclass.)
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12 5. There is a predefined `help' method. Given an argument `topic', it
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13 calls the command `help_topic'. With no arguments, it lists all topics
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14 with defined help_ functions, broken into up to three topics; documented
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15 commands, miscellaneous help topics, and undocumented commands.
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16 6. The command '?' is a synonym for `help'. The command '!' is a synonym
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17 for `shell', if a do_shell method exists.
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18 7. If completion is enabled, completing commands will be done automatically,
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19 and completing of commands args is done by calling complete_foo() with
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20 arguments text, line, begidx, endidx. text is string we are matching
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21 against, all returned matches must begin with it. line is the current
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22 input line (lstripped), begidx and endidx are the beginning and end
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23 indexes of the text being matched, which could be used to provide
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24 different completion depending upon which position the argument is in.
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25
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26 The `default' method may be overridden to intercept commands for which there
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27 is no do_ method.
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28
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29 The `completedefault' method may be overridden to intercept completions for
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30 commands that have no complete_ method.
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31
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32 The data member `self.ruler' sets the character used to draw separator lines
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33 in the help messages. If empty, no ruler line is drawn. It defaults to "=".
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34
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35 If the value of `self.intro' is nonempty when the cmdloop method is called,
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36 it is printed out on interpreter startup. This value may be overridden
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37 via an optional argument to the cmdloop() method.
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38
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39 The data members `self.doc_header', `self.misc_header', and
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40 `self.undoc_header' set the headers used for the help function's
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41 listings of documented functions, miscellaneous topics, and undocumented
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42 functions respectively.
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43 """
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44
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45 import string, sys
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46
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47 __all__ = ["Cmd"]
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48
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49 PROMPT = '(Cmd) '
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50 IDENTCHARS = string.ascii_letters + string.digits + '_'
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51
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52 class Cmd:
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53 """A simple framework for writing line-oriented command interpreters.
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54
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55 These are often useful for test harnesses, administrative tools, and
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56 prototypes that will later be wrapped in a more sophisticated interface.
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57
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58 A Cmd instance or subclass instance is a line-oriented interpreter
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59 framework. There is no good reason to instantiate Cmd itself; rather,
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60 it's useful as a superclass of an interpreter class you define yourself
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61 in order to inherit Cmd's methods and encapsulate action methods.
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62
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63 """
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64 prompt = PROMPT
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65 identchars = IDENTCHARS
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66 ruler = '='
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67 lastcmd = ''
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68 intro = None
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69 doc_leader = ""
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70 doc_header = "Documented commands (type help <topic>):"
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71 misc_header = "Miscellaneous help topics:"
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72 undoc_header = "Undocumented commands:"
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73 nohelp = "*** No help on %s"
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74 use_rawinput = 1
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75
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76 def __init__(self, completekey='tab', stdin=None, stdout=None):
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77 """Instantiate a line-oriented interpreter framework.
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78
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79 The optional argument 'completekey' is the readline name of a
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80 completion key; it defaults to the Tab key. If completekey is
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81 not None and the readline module is available, command completion
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82 is done automatically. The optional arguments stdin and stdout
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83 specify alternate input and output file objects; if not specified,
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84 sys.stdin and sys.stdout are used.
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85
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86 """
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87 if stdin is not None:
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88 self.stdin = stdin
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89 else:
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90 self.stdin = sys.stdin
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91 if stdout is not None:
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92 self.stdout = stdout
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93 else:
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94 self.stdout = sys.stdout
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95 self.cmdqueue = []
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96 self.completekey = completekey
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97
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98 def cmdloop(self, intro=None):
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99 """Repeatedly issue a prompt, accept input, parse an initial prefix
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100 off the received input, and dispatch to action methods, passing them
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101 the remainder of the line as argument.
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102
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103 """
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104
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105 self.preloop()
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106 if self.use_rawinput and self.completekey:
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107 try:
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108 import readline
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109 self.old_completer = readline.get_completer()
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110 readline.set_completer(self.complete)
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111 readline.parse_and_bind(self.completekey+": complete")
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112 except ImportError:
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113 pass
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114 try:
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115 if intro is not None:
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116 self.intro = intro
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117 if self.intro:
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118 self.stdout.write(str(self.intro)+"\n")
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119 stop = None
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120 while not stop:
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121 if self.cmdqueue:
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122 line = self.cmdqueue.pop(0)
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123 else:
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124 if self.use_rawinput:
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125 try:
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126 line = input(self.prompt)
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127 except EOFError:
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128 line = 'EOF'
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129 else:
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130 self.stdout.write(self.prompt)
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131 self.stdout.flush()
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132 line = self.stdin.readline()
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133 if not len(line):
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134 line = 'EOF'
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135 else:
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136 line = line.rstrip('\r\n')
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137 line = self.precmd(line)
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138 stop = self.onecmd(line)
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139 stop = self.postcmd(stop, line)
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140 self.postloop()
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141 finally:
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142 if self.use_rawinput and self.completekey:
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143 try:
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144 import readline
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145 readline.set_completer(self.old_completer)
Michael W. Hudson <mwh@python.net>
parents: 30755
diff changeset
146 except ImportError:
Michael W. Hudson <mwh@python.net>
parents: 30755
diff changeset
147 pass
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parents: 32457
diff changeset
148
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149
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diff changeset
150 def precmd(self, line):
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151 """Hook method executed just before the command line is
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diff changeset
152 interpreted, but after the input prompt is generated and issued.
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153
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154 """
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diff changeset
155 return line
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diff changeset
156
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157 def postcmd(self, stop, line):
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158 """Hook method executed just after a command dispatch is finished."""
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diff changeset
159 return stop
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160
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diff changeset
161 def preloop(self):
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162 """Hook method executed once when the cmdloop() method is called."""
32457
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parents: 30755
diff changeset
163 pass
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164
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165 def postloop(self):
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166 """Hook method executed once when the cmdloop() method is about to
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167 return.
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168
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169 """
32457
Michael W. Hudson <mwh@python.net>
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170 pass
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Tim Peters <tim.peters@gmail.com>
parents: 32457
diff changeset
171
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172 def parseline(self, line):
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Andrew M. Kuchling <amk@amk.ca>
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diff changeset
173 """Parse the line into a command name and a string containing
4d79e8490c76 Add docstring
Andrew M. Kuchling <amk@amk.ca>
parents: 27963
diff changeset
174 the arguments. Returns a tuple containing (command, args, line).
4d79e8490c76 Add docstring
Andrew M. Kuchling <amk@amk.ca>
parents: 27963
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175 'command' and 'args' may be None if the line couldn't be parsed.
4d79e8490c76 Add docstring
Andrew M. Kuchling <amk@amk.ca>
parents: 27963
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176 """
16478
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177 line = line.strip()
13533
1e7c32bddb8f Bug fix: ? and ! were not full aliases for `help' and `shell' as implied in
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parents: 11691
diff changeset
178 if not line:
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179 return None, None, line
13533
1e7c32bddb8f Bug fix: ? and ! were not full aliases for `help' and `shell' as implied in
Eric S. Raymond <esr@thyrsus.com>
parents: 11691
diff changeset
180 elif line[0] == '?':
1e7c32bddb8f Bug fix: ? and ! were not full aliases for `help' and `shell' as implied in
Eric S. Raymond <esr@thyrsus.com>
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181 line = 'help ' + line[1:]
1e7c32bddb8f Bug fix: ? and ! were not full aliases for `help' and `shell' as implied in
Eric S. Raymond <esr@thyrsus.com>
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diff changeset
182 elif line[0] == '!':
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183 if hasattr(self, 'do_shell'):
13533
1e7c32bddb8f Bug fix: ? and ! were not full aliases for `help' and `shell' as implied in
Eric S. Raymond <esr@thyrsus.com>
parents: 11691
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184 line = 'shell ' + line[1:]
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Guido van Rossum <guido@python.org>
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185 else:
18855
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
186 return None, None, line
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Guido van Rossum <guido@python.org>
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diff changeset
187 i, n = 0, len(line)
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
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diff changeset
188 while i < n and line[i] in self.identchars: i = i+1
16478
edc0c99a69d6 String method conversion.
Eric S. Raymond <esr@thyrsus.com>
parents: 16280
diff changeset
189 cmd, arg = line[:i], line[i:].strip()
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190 return cmd, arg, line
19119
600a9a2b7a18 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 18855
diff changeset
191
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Martin v. Löwis <martin@v.loewis.de>
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192 def onecmd(self, line):
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193 """Interpret the argument as though it had been typed in response
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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parents: 22493
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194 to the prompt.
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195
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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196 This may be overridden, but should not normally need to be;
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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197 see the precmd() and postcmd() methods for useful execution hooks.
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198 The return value is a flag indicating whether interpretation of
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199 commands by the interpreter should stop.
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200
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Raymond Hettinger <python@rcn.com>
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201 """
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
202 cmd, arg, line = self.parseline(line)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
203 if not line:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
204 return self.emptyline()
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
205 if cmd is None:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
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diff changeset
206 return self.default(line)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
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diff changeset
207 self.lastcmd = line
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diff changeset
208 if cmd == '':
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
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diff changeset
209 return self.default(line)
e34991022571 Mass patch by Ka-Ping Yee:
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diff changeset
210 else:
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
211 try:
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
212 func = getattr(self, 'do_' + cmd)
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
213 except AttributeError:
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
214 return self.default(line)
e34991022571 Mass patch by Ka-Ping Yee:
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diff changeset
215 return func(arg)
624
0e436200bf12 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
216
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diff changeset
217 def emptyline(self):
23565
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218 """Called when an empty line is entered in response to the prompt.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
219
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
220 If this method is not overridden, it repeats the last nonempty
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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parents: 22493
diff changeset
221 command entered.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
222
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
223 """
11691
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
224 if self.lastcmd:
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
225 return self.onecmd(self.lastcmd)
8584
cb7fcfb56275 Improved by Eric Raymond.
Guido van Rossum <guido@python.org>
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diff changeset
226
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diff changeset
227 def default(self, line):
23565
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
228 """Called on an input line when the command prefix is not recognized.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
229
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
230 If this method is not overridden, it prints an error message and
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
231 returns.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
232
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
233 """
27713
aade4bc125f8 Updated version of [ 558544 ] cmd.py: add instance-specific stdin/out
Anthony Baxter <anthonybaxter@gmail.com>
parents: 27627
diff changeset
234 self.stdout.write('*** Unknown syntax: %s\n'%line)
624
0e436200bf12 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
235
18855
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
236 def completedefault(self, *ignored):
23565
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
237 """Method called to complete an input line when no command-specific
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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parents: 22493
diff changeset
238 complete_*() method is available.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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diff changeset
239
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
240 By default, it returns an empty list.
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
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parents: 22493
diff changeset
241
1a67fbc7a066 Patch 560023 adding docstrings. 2.2 Candidate (after verifying modules were not updated after 2.2).
Raymond Hettinger <python@rcn.com>
parents: 22493
diff changeset
242 """
18855
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
243 return []
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
244
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
245 def completenames(self, text, *ignored):
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
246 dotext = 'do_'+text
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
247 return [a[3:] for a in self.get_names() if a.startswith(dotext)]
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
248
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
249 def complete(self, text, state):
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
250 """Return the next possible completion for 'text'.
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
251
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
252 If a command has not been entered, then complete against command list.
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
253 Otherwise try to call complete_<command> to get list of completions.
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
254 """
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
255 if state == 0:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
256 import readline
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
257 origline = readline.get_line_buffer()
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
258 line = origline.lstrip()
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
259 stripped = len(origline) - len(line)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
260 begidx = readline.get_begidx() - stripped
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
261 endidx = readline.get_endidx() - stripped
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
262 if begidx>0:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
263 cmd, args, foo = self.parseline(line)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
264 if cmd == '':
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
265 compfunc = self.completedefault
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
266 else:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
267 try:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
268 compfunc = getattr(self, 'complete_' + cmd)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
269 except AttributeError:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
270 compfunc = self.completedefault
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
271 else:
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
272 compfunc = self.completenames
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
273 self.completion_matches = compfunc(text, line, begidx, endidx)
6f301b3cf323 Patch #416224: add readline completion to cmd.Cmd.
Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
274 try:
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Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
275 return self.completion_matches[state]
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diff changeset
276 except IndexError:
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
277 return None
19119
600a9a2b7a18 Whitespace normalization.
Tim Peters <tim.peters@gmail.com>
parents: 18855
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278
18855
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Martin v. Löwis <martin@v.loewis.de>
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diff changeset
279 def get_names(self):
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diff changeset
280 # This method used to pull in base class attributes
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diff changeset
281 # at a time dir() didn't do it yet.
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282 return dir(self.__class__)
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283
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284 def complete_help(self, *args):
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285 commands = set(self.completenames(*args))
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286 topics = set(a[5:] for a in self.get_names()
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287 if a.startswith('help_' + args[0]))
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288 return list(commands | topics)
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289
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290 def do_help(self, arg):
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Raymond Hettinger <python@rcn.com>
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291 'List available commands with "help" or detailed help with "help cmd".'
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292 if arg:
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293 # XXX check arg syntax
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294 try:
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295 func = getattr(self, 'help_' + arg)
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Skip Montanaro <skip@pobox.com>
parents: 22532
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296 except AttributeError:
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Guido van Rossum <guido@python.org>
parents: 10820
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297 try:
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Guido van Rossum <guido@python.org>
parents: 10820
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298 doc=getattr(self, 'do_' + arg).__doc__
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Guido van Rossum <guido@python.org>
parents: 10820
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299 if doc:
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300 self.stdout.write("%s\n"%str(doc))
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301 return
22493
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Skip Montanaro <skip@pobox.com>
parents: 22532
diff changeset
302 except AttributeError:
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Guido van Rossum <guido@python.org>
parents: 10820
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303 pass
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304 self.stdout.write("%s\n"%str(self.nohelp % (arg,)))
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
305 return
e34991022571 Mass patch by Ka-Ping Yee:
Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
306 func()
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Guido van Rossum <guido@python.org>
parents: 10820
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307 else:
18855
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Martin v. Löwis <martin@v.loewis.de>
parents: 18781
diff changeset
308 names = self.get_names()
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
309 cmds_doc = []
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Guido van Rossum <guido@python.org>
parents: 10820
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310 cmds_undoc = []
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Guido van Rossum <guido@python.org>
parents: 10820
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311 help = {}
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
312 for name in names:
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
313 if name[:5] == 'help_':
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Guido van Rossum <guido@python.org>
parents: 10820
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314 help[name[5:]]=1
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
315 names.sort()
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
316 # There can be duplicates if routines overridden
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parents: 10820
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317 prevname = ''
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Guido van Rossum <guido@python.org>
parents: 10820
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318 for name in names:
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
319 if name[:3] == 'do_':
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Guido van Rossum <guido@python.org>
parents: 10820
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320 if name == prevname:
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Guido van Rossum <guido@python.org>
parents: 10820
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321 continue
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parents: 10820
diff changeset
322 prevname = name
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Guido van Rossum <guido@python.org>
parents: 10820
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323 cmd=name[3:]
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Raymond Hettinger <python@rcn.com>
parents: 23565
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324 if cmd in help:
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325 cmds_doc.append(cmd)
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
326 del help[cmd]
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
327 elif getattr(self, name).__doc__:
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
328 cmds_doc.append(cmd)
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Guido van Rossum <guido@python.org>
parents: 10820
diff changeset
329 else:
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parents: 10820
diff changeset
330 cmds_undoc.append(cmd)
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diff changeset
331 self.stdout.write("%s\n"%str(self.doc_leader))
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parents: 10820
diff changeset
332 self.print_topics(self.doc_header, cmds_doc, 15,80)
41985
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Alexandre Vassalotti <alexandre@peadrop.com>
parents: 41554
diff changeset
333 self.print_topics(self.misc_header, list(help.keys()),15,80)
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parents: 10820
diff changeset
334 self.print_topics(self.undoc_header, cmds_undoc, 15,80)
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parents: 1435
diff changeset
335
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diff changeset
336 def print_topics(self, header, cmds, cmdlen, maxcol):
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parents: 10820
diff changeset
337 if cmds:
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diff changeset
338 self.stdout.write("%s\n"%str(header))
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parents: 10820
diff changeset
339 if self.ruler:
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diff changeset
340 self.stdout.write("%s\n"%str(self.ruler * len(header)))
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diff changeset
341 self.columnize(cmds, maxcol-1)
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342 self.stdout.write("\n")
26494
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343
3f8019273549 Add a better columnizer to print_topics().
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diff changeset
344 def columnize(self, list, displaywidth=80):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
345 """Display a list of strings as a compact set of columns.
3f8019273549 Add a better columnizer to print_topics().
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diff changeset
346
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diff changeset
347 Each column is only as wide as necessary.
3f8019273549 Add a better columnizer to print_topics().
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diff changeset
348 Columns are separated by two spaces (one was not legible enough).
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
349 """
3f8019273549 Add a better columnizer to print_topics().
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diff changeset
350 if not list:
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diff changeset
351 self.stdout.write("<empty>\n")
26494
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diff changeset
352 return
41985
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Alexandre Vassalotti <alexandre@peadrop.com>
parents: 41554
diff changeset
353
26494
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Guido van Rossum <guido@python.org>
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diff changeset
354 nonstrings = [i for i in range(len(list))
43577
ace45b361e87 Patch# 1258 by Christian Heimes: kill basestring.
Guido van Rossum <guido@python.org>
parents: 43020
diff changeset
355 if not isinstance(list[i], str)]
26494
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
356 if nonstrings:
43020
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41985
diff changeset
357 raise TypeError("list[i] not a string for i in %s"
907a45df1295 Raise statement normalization in Lib/.
Collin Winter <collinw@gmail.com>
parents: 41985
diff changeset
358 % ", ".join(map(str, nonstrings)))
26494
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
359 size = len(list)
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
360 if size == 1:
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diff changeset
361 self.stdout.write('%s\n'%str(list[0]))
26494
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
362 return
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
363 # Try every row count from 1 upwards
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
364 for nrows in range(1, len(list)):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
365 ncols = (size+nrows-1) // nrows
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
366 colwidths = []
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
367 totwidth = -2
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
368 for col in range(ncols):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
369 colwidth = 0
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
370 for row in range(nrows):
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parents: 24058
diff changeset
371 i = row + nrows*col
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Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
372 if i >= size:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
373 break
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
374 x = list[i]
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Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
375 colwidth = max(colwidth, len(x))
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
376 colwidths.append(colwidth)
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Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
377 totwidth += colwidth + 2
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
378 if totwidth > displaywidth:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
379 break
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
380 if totwidth <= displaywidth:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
381 break
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
382 else:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
383 nrows = len(list)
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
384 ncols = 1
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
385 colwidths = [0]
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
386 for row in range(nrows):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
387 texts = []
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
388 for col in range(ncols):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
389 i = row + nrows*col
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
390 if i >= size:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
391 x = ""
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
392 else:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
393 x = list[i]
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
394 texts.append(x)
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
395 while texts and not texts[-1]:
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
396 del texts[-1]
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
397 for col in range(len(texts)):
3f8019273549 Add a better columnizer to print_topics().
Guido van Rossum <guido@python.org>
parents: 24058
diff changeset
398 texts[col] = texts[col].ljust(colwidths[col])
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Anthony Baxter <anthonybaxter@gmail.com>
parents: 27627
diff changeset
399 self.stdout.write("%s\n"%str(" ".join(texts)))