annotate Doc/lib/libcmd.tex @ 15842:f6cd36498a50 legacy-trunk

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author Martin v. Löwis <martin@v.loewis.de>
date Sat, 13 Jan 2001 09:54:41 +0000
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1 \section{\module{cmd} ---
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2 Support for line-oriented command interpreters}
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3
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4 \declaremodule{standard}{cmd}
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5 \sectionauthor{Eric S. Raymond}{esr@snark.thyrsus.com}
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6 \modulesynopsis{Build line-oriented command interpreters.}
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7
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9 The \class{Cmd} class provides a simple framework for writing
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10 line-oriented command interpreters. These are often useful for
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11 test harnesses, administrative tools, and prototypes that will
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12 later be wrapped in a more sophisticated interface.
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13
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14 \begin{classdesc}{Cmd}{}
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15 A \class{Cmd} instance or subclass instance is a line-oriented
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16 interpreter framework. There is no good reason to instantiate
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17 \class{Cmd} itself; rather, it's useful as a superclass of an
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18 interpreter class you define yourself in order to inherit
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19 \class{Cmd}'s methods and encapsulate action methods.
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20 \end{classdesc}
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21
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22 \subsection{Cmd Objects}
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23 \label{Cmd-objects}
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24
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25 A \class{Cmd} instance has the following methods:
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26
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27 \begin{methoddesc}{cmdloop}{\optional{intro}}
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28 Repeatedly issue a prompt, accept input, parse an initial prefix off
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29 the received input, and dispatch to action methods, passing them the
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30 remainder of the line as argument.
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31
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32 The optional argument is a banner or intro string to be issued before the
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33 first prompt (this overrides the \member{intro} class member).
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34
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35 If the \module{readline} module is loaded, input will automatically
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36 inherit \program{bash}-like history-list editing (e.g. \kbd{Ctrl-P}
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37 scrolls back to the last command, \kbd{Ctrl-N} forward to the next
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38 one, \kbd{Ctrl-F} moves the cursor to the right non-destructively,
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39 \kbd{Ctrl-B} moves the cursor to the left non-destructively, etc.).
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41 An end-of-file on input is passed back as the string \code{'EOF'}.
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42
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43 An interpreter instance will recognize a command name \samp{foo} if
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44 and only if it has a method \method{do_foo()}. As a special case,
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45 a line beginning with the character \character{?} is dispatched to
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46 the method \method{do_help()}. As another special case, a line
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47 beginning with the character \character{!} is dispatched to the
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48 method \method{do_shell} (if such a method is defined).
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49
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50 All subclasses of \class{Cmd} inherit a predefined \method{do_help}.
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51 This method, called with an argument \code{bar}, invokes the
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52 corresponding method \method{help_bar()}. With no argument,
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53 \method{do_help()} lists all available help topics (that is, all
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54 commands with corresponding \method{help_*()} methods), and also lists
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55 any undocumented commands.
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56 \end{methoddesc}
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57
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58 \begin{methoddesc}{onecmd}{str}
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59 Interpret the argument as though it had been typed in in
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60 response to the prompt.
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61 \end{methoddesc}
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62
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63 \begin{methoddesc}{emptyline}{}
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64 Method called when an empty line is entered in response to the prompt.
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65 If this method is not overridden, it repeats the last nonempty command
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66 entered.
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67 \end{methoddesc}
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68
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69 \begin{methoddesc}{default}{line}
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70 Method called on an input line when the command prefix is not
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71 recognized. If this method is not overridden, it prints an
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72 error message and returns.
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73 \end{methoddesc}
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74
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75 \begin{methoddesc}{precmd}{}
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76 Hook method executed just before the input prompt is issued. This
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77 method is a stub in \class{Cmd}; it exists to be overridden by
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78 subclasses.
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79 \end{methoddesc}
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80
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81 \begin{methoddesc}{postcmd}{}
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82 Hook method executed just after a command dispatch is finished. This
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83 method is a stub in \class{Cmd}; it exists to be overridden by
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84 subclasses.
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85 \end{methoddesc}
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86
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87 \begin{methoddesc}{preloop}{}
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88 Hook method executed once when \method{cmdloop()} is called. This
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89 method is a stub in \class{Cmd}; it exists to be overridden by
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90 subclasses.
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91 \end{methoddesc}
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92
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93 \begin{methoddesc}{postloop}{}
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94 Hook method executed once when \method{cmdloop()} is about to return.
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95 This method is a stub in \class{Cmd}; it exists to be overridden by
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96 subclasses.
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97 \end{methoddesc}
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98
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99 Instances of \class{Cmd} subclasses have some public instance variables:
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100
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101 \begin{memberdesc}{prompt}
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102 The prompt issued to solicit input.
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103 \end{memberdesc}
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104
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105 \begin{memberdesc}{identchars}
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106 The string of characters accepted for the command prefix.
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107 \end{memberdesc}
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108
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109 \begin{memberdesc}{lastcmd}
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110 The last nonempty command prefix seen.
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111 \end{memberdesc}
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112
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113 \begin{memberdesc}{intro}
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114 A string to issue as an intro or banner. May be overridden by giving
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115 the \method{cmdloop()} method an argument.
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116 \end{memberdesc}
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117
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118 \begin{memberdesc}{doc_header}
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119 The header to issue if the help output has a section for documented
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120 commands.
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121 \end{memberdesc}
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122
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123 \begin{memberdesc}{misc_header}
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124 The header to issue if the help output has a section for miscellaneous
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125 help topics (that is, there are \method{help_*()} methods without
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126 corresponding \method{do_*()} methods).
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127 \end{memberdesc}
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128
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129 \begin{memberdesc}{undoc_header}
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130 The header to issue if the help output has a section for undocumented
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131 commands (that is, there are \method{do_*()} methods without
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132 corresponding \method{help_*()} methods).
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133 \end{memberdesc}
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134
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135 \begin{memberdesc}{ruler}
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136 The character used to draw separator lines under the help-message
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137 headers. If empty, no ruler line is drawn. It defaults to
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138 \character{=}.
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139 \end{memberdesc}
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141