Mercurial > python-cmd2
annotate README.txt @ 18:b7489d3f838e
more readme correction, now in function def
| author | catherine@localhost |
|---|---|
| date | Thu, 15 May 2008 13:43:54 -0400 |
| parents | f81b5670a713 |
| children | 1899088dd95d |
| rev | line source |
|---|---|
| 6 | 1 `cmd2` is a tool for writing command-line interactive applications. It is based on the Python Standard Library's `cmd` module, and can be used anyplace `cmd` is used simply by importing `cmd2` instead. |
| 2 | |
| 3 `cmd2` provides the following features, in addition to those already existing in `cmd`: | |
| 4 | |
| 5 - Searchable command history | |
| 6 - Load commands from file, save to file, edit commands in file | |
| 7 - Multi-line commands | |
| 8 - Case-insensitive commands | |
| 9 - Special-character shortcut commands (beyond cmd's "@" and "!") | |
| 10 - Settable environment parameters | |
| 11 - Parsing commands with flags | |
| 12 | |
| 13 Instructions for implementing each feature follow. | |
| 14 | |
| 15 - Searchable command history | |
| 16 | |
| 17 All commands will automatically be tracked in the session's history, unless the command is listed in Cmd's excludeFromHistory attribute. | |
| 18 The history is accessed through the `history`, `list`, and `run` commands | |
| 19 (and their abbreviations: `hi`, `li`, `l`, `r`). | |
| 20 If you wish to exclude some of your custom commands from the history, append their names | |
| 21 to the list at Cmd.ExcludeFromHistory. | |
| 22 | |
| 23 - Load commands from file, save to file, edit commands in file | |
| 24 | |
| 25 Type `help load`, `help save`, `help edit` for details. | |
| 26 | |
| 27 - Multi-line commands | |
| 28 | |
| 29 Any command accepts multi-line input when its name is listed in `Cmd.multilineCommands`. | |
| 30 The program will keep expecting input until a line ends with any of the characters | |
| 31 in `Cmd.terminators` . The default terminators are `;` and `/n` (empty newline). | |
| 32 | |
| 33 - Case-insensitive commands | |
| 34 | |
| 35 All commands are case-insensitive, unless `Cmd.caseInsensitive` is set to `False`. | |
| 36 | |
| 37 - Special-character shortcut commands (beyond cmd's "@" and "!") | |
| 38 | |
| 39 To create a single-character shortcut for a command, update `Cmd.shortcuts`. | |
| 40 | |
| 41 - Settable environment parameters | |
| 42 | |
| 43 To allow a user to change an environment parameter during program execution, | |
| 44 append the parameter's name to `Cmd.settable`. | |
| 45 | |
| 13 | 46 - Parsing commands with `optparse` options (flags) |
| 6 | 47 |
| 13 | 48 :: |
| 49 | |
| 17 | 50 @options([make_option('-m', '--myoption', action="store_true", help="all about my option")]) |
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51 def myfunc(self, arg, opts): |
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52 if opts.myoption: |
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53 ... |
| 13 | 54 |
| 55 See Python standard library's `optparse` documentation: http://docs.python.org/lib/optparse-defining-options.html | |
| 56 | |
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57 - Catherine Devlin, http://catherinedevlin.blogspot.com |
| 6 | 58 |
| 59 cmd2 can be installed with `easy_install cmd2` | |
| 60 | |
| 16 | 61 Cheese Shop page: http://pypi.python.org/pypi/cmd2 |
| 6 | 62 |
| 63 Example cmd2 application (cmd2_example.py) :: | |
| 64 | |
| 13 | 65 from cmd2 import Cmd, make_option, options |
| 66 | |
| 6 | 67 class CmdLineApp(Cmd): |
| 68 multilineCommands = ['orate'] | |
| 69 Cmd.shortcuts.update({'&': 'speak'}) | |
| 70 maxrepeats = 3 | |
| 13 | 71 Cmd.settable.append('maxrepeats') |
| 72 | |
| 73 @options([make_option('-p', '--piglatin', action="store_true", help="atinLay"), | |
| 74 make_option('-s', '--shout', action="store_true", help="N00B EMULATION MODE"), | |
| 75 make_option('-r', '--repeat', type="int", help="output [n] times") | |
| 76 ]) | |
| 77 def do_speak(self, arg, opts=None): | |
| 78 """Repeats what you tell me to.""" | |
| 79 arg = ' '.join(arg) | |
| 80 if opts.piglatin: | |
| 6 | 81 arg = '%s%say' % (arg[1:], arg[0]) |
| 13 | 82 if opts.shout: |
| 6 | 83 arg = arg.upper() |
| 13 | 84 repetitions = opts.repeat or 1 |
| 6 | 85 for i in range(min(repetitions, self.maxrepeats)): |
| 86 self.stdout.write(arg) | |
| 87 self.stdout.write('\n') | |
| 88 # self.stdout.write is better than "print", because Cmd can be | |
| 89 # initialized with a non-standard output destination | |
| 13 | 90 |
| 6 | 91 do_say = do_speak # now "say" is a synonym for "speak" |
| 92 do_orate = do_speak # another synonym, but this one takes multi-line input | |
| 13 | 93 |
| 6 | 94 app = CmdLineApp() |
| 95 app.cmdloop() | |
| 96 | |
| 97 Sample session using the above code :: | |
| 98 | |
| 99 c:\cmd2>python cmd2_example.py | |
| 100 (Cmd) speak softly | |
| 101 softly | |
| 102 (Cmd) speak --piglatin softly | |
| 103 oftlysay | |
| 104 (Cmd) speak -psr 2 softly | |
| 105 OFTLYSAY | |
| 106 OFTLYSAY | |
| 107 (Cmd) speak --repeat 1000000 softly | |
| 108 softly | |
| 109 softly | |
| 110 softly | |
| 111 (Cmd) show maxrepeats | |
| 112 maxrepeats: 3 | |
| 113 (Cmd) set maxrepeats 5 | |
| 114 maxrepeats - was: 3 | |
| 115 now: 5 | |
| 116 (Cmd) speak --repeat 1000000 softly | |
| 117 softly | |
| 118 softly | |
| 119 softly | |
| 120 softly | |
| 121 softly | |
| 122 (Cmd) orate blah blah | |
| 123 > blah | |
| 124 > and furthermore | |
| 125 > blah | |
| 126 > | |
| 127 blah blah blah and furthermore blah | |
| 128 (Cmd) &greetings | |
| 129 greetings | |
| 130 (Cmd) history | |
| 131 -------------------------[1] | |
| 132 speak softly | |
| 133 -------------------------[2] | |
| 134 speak --piglatin softly | |
| 135 -------------------------[3] | |
| 136 speak -psr 2 softly | |
| 137 -------------------------[4] | |
| 138 speak --repeat 1000000 softly | |
| 139 -------------------------[5] | |
| 140 show maxrepeats | |
| 141 -------------------------[6] | |
| 142 set maxrepeats 5 | |
| 143 -------------------------[7] | |
| 144 speak --repeat 1000000 softly | |
| 145 -------------------------[8] | |
| 146 orate blah blah | |
| 147 blah | |
| 148 and furthermore | |
| 149 blah | |
| 150 | |
| 151 -------------------------[9] | |
| 152 &greetings | |
| 153 (Cmd) run | |
| 154 orate blah blah | |
| 155 blah | |
| 156 and furthermore | |
| 157 blah | |
| 158 | |
| 159 blah blah blah and furthermore blah | |
| 160 (Cmd) run 3 | |
| 161 speak -psr 2 softly | |
| 162 OFTLYSAY | |
| 163 OFTLYSAY | |
| 164 (Cmd) history maxrepeats | |
| 165 -------------------------[5] | |
| 166 set maxrepeats | |
| 167 -------------------------[6] | |
| 168 set maxrepeats 5 | |
| 169 (Cmd) |