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1 ;;; skeleton.el --- Lisp language extension for writing statement skeletons
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2 ;; Copyright (C) 1993, 1994, 1995 by Free Software Foundation, Inc.
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3
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4 ;; Author: Daniel.Pfeiffer@Informatik.START.dbp.de, fax (+49 69) 7588-2389
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5 ;; Maintainer: FSF
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6 ;; Keywords: extensions, abbrev, languages, tools
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7
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8 ;; This file is part of GNU Emacs.
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9
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10 ;; GNU Emacs is free software; you can redistribute it and/or modify
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11 ;; it under the terms of the GNU General Public License as published by
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12 ;; the Free Software Foundation; either version 2, or (at your option)
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13 ;; any later version.
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14
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15 ;; GNU Emacs is distributed in the hope that it will be useful,
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16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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18 ;; GNU General Public License for more details.
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19
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20 ;; You should have received a copy of the GNU General Public License
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21 ;; along with GNU Emacs; see the file COPYING. If not, write to
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22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
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23
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24 ;;; Synched up with: FSF 19.30.
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25
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26 ;;; Commentary:
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27
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28 ;; A very concise language extension for writing structured statement
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29 ;; skeleton insertion commands for programming language modes. This
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30 ;; originated in shell-script mode and was applied to ada-mode's
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31 ;; commands which shrunk to one third. And these commands are now
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32 ;; user configurable.
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33
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34 ;;; Code:
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35
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36 ;; page 1: statement skeleton language definition & interpreter
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37 ;; page 2: paired insertion
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38 ;; page 3: mirror-mode, an example for setting up paired insertion
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39
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40
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41 (defvar skeleton-transformation nil
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42 "*If non-nil, function applied to literal strings before they are inserted.
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43 It should take strings and characters and return them transformed, or nil
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44 which means no transformation.
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45 Typical examples might be `upcase' or `capitalize'.")
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46
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47 ; this should be a fourth argument to defvar
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48 (put 'skeleton-transformation 'variable-interactive
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49 "aTransformation function: ")
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50
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51
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52
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53 (defvar skeleton-end-hook
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54 (lambda ()
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55 (or (eolp) (newline-and-indent)))
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56 "Hook called at end of skeleton but before going to point of interest.
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57 By default this moves out anything following to next line.
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58 The variables `v1' and `v2' are still set when calling this.")
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59
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60
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61 ;;;###autoload
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62 (defvar skeleton-filter 'identity
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63 "Function for transforming a skeleton-proxy's aliases' variable value.")
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64
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65 (defvar skeleton-untabify t
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66 "When non-`nil' untabifies when deleting backwards with element -ARG.")
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67
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68 (defvar skeleton-newline-indent-rigidly nil
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69 "When non-`nil', indent rigidly under current line for element `\\n'.
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70 Else use mode's `indent-line-function'.")
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71
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72 (defvar skeleton-further-elements ()
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73 "A buffer-local varlist (see `let') of mode specific skeleton elements.
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74 These variables are bound while interpreting a skeleton. Their value may
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75 in turn be any valid skeleton element if they are themselves to be used as
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76 skeleton elements.")
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77 (make-variable-buffer-local 'skeleton-further-elements)
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78
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79
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80 (defvar skeleton-subprompt
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81 (substitute-command-keys
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82 "RET, \\<minibuffer-local-map>\\[abort-recursive-edit] or \\[help-command]")
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83 "*Replacement for %s in prompts of recursive subskeletons.")
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84
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85
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86 (defvar skeleton-abbrev-cleanup nil)
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87
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88
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89 (eval-and-compile
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90 (defvar skeleton-debug nil
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91 "*If non-nil `define-skeleton' will override previous definition."))
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92
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93 ;; reduce the number of compiler warnings
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94 (defvar skeleton)
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95 (defvar skeleton-modified)
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96 (defvar skeleton-point)
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97 (defvar skeleton-regions)
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98
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99 ;;;###autoload
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100 (defmacro define-skeleton (command documentation &rest skeleton)
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101 "Define a user-configurable COMMAND that enters a statement skeleton.
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102 DOCUMENTATION is that of the command, while the variable of the same name,
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103 which contains the skeleton, has a documentation to that effect.
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104 INTERACTOR and ELEMENT ... are as defined under `skeleton-insert'."
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105 (if skeleton-debug
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106 (set command skeleton))
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107 `(progn
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108 (defvar ,command ',skeleton ,documentation)
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109 (defalias ',command 'skeleton-proxy)))
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110
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111
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112
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113 ;; This command isn't meant to be called, only it's aliases with meaningful
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114 ;; names are.
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115 ;;;###autoload
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116 (defun skeleton-proxy (&optional str arg)
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117 "Insert skeleton defined by variable of same name (see `skeleton-insert').
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118 Prefix ARG allows wrapping around words or regions (see `skeleton-insert').
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119 This command can also be an abbrev expansion (3rd and 4th columns in
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120 \\[edit-abbrevs] buffer: \"\" command-name).
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121
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122 When called as a function, optional first argument STR may also be a string
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123 which will be the value of `str' whereas the skeleton's interactor is then
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124 ignored."
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125 (interactive "*P\nP")
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126 (let ((function (nth 1 (backtrace-frame 1))))
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127 (if (eq function 'nth) ; uncompiled lisp function
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128 (setq function (nth 1 (backtrace-frame 5)))
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129 (if (eq function 'byte-code) ; tracing byte-compiled function
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130 (setq function (nth 1 (backtrace-frame 2)))))
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131 (if (not (setq function (funcall skeleton-filter (symbol-value function))))
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132 (if (memq this-command '(self-insert-command
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133 skeleton-pair-insert-maybe
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134 expand-abbrev))
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135 (setq buffer-undo-list (primitive-undo 1 buffer-undo-list)))
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136 (skeleton-insert function
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137 (if (setq skeleton-abbrev-cleanup
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138 (or (eq this-command 'self-insert-command)
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139 (eq this-command
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140 'skeleton-pair-insert-maybe)))
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141 ()
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142 ;; Pretend C-x a e passed its prefix arg to us
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143 (if (or arg current-prefix-arg)
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144 (prefix-numeric-value (or arg
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145 current-prefix-arg))))
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146 (if (stringp str)
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147 str))
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148 (if skeleton-abbrev-cleanup
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149 (setq deferred-action-list t
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150 deferred-action-function 'skeleton-abbrev-cleanup
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151 skeleton-abbrev-cleanup (point))))))
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152
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153
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154 (defun skeleton-abbrev-cleanup (&rest list)
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155 "Value for `post-command-hook' to remove char that expanded abbrev."
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156 (if (integerp skeleton-abbrev-cleanup)
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157 (progn
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158 (delete-region skeleton-abbrev-cleanup (point))
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159 (setq deferred-action-list ()
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160 deferred-action-function nil
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161 skeleton-abbrev-cleanup nil))))
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162
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163
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164 ;;;###autoload
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165 (defun skeleton-insert (skeleton &optional skeleton-regions str)
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166 "Insert the complex statement skeleton SKELETON describes very concisely.
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167
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168 With optional third REGIONS wrap first interesting point (`_') in skeleton
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169 around next REGIONS words, if REGIONS is positive. If REGIONS is negative,
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170 wrap REGIONS preceding interregions into first REGIONS interesting positions
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171 \(successive `_'s) in skeleton. An interregion is the stretch of text between
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172 two contiguous marked points. If you marked A B C [] (where [] is the cursor)
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173 in alphabetical order, the 3 interregions are simply the last 3 regions. But
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174 if you marked B A [] C, the interregions are B-A, A-[], []-C.
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175
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176 Optional fourth STR is the value for the variable `str' within the skeleton.
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177 When this is non-`nil' the interactor gets ignored, and this should be a valid
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178 skeleton element.
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179
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180 SKELETON is made up as (INTERACTOR ELEMENT ...). INTERACTOR may be nil if
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181 not needed, a prompt-string or an expression for complex read functions.
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182
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183 If ELEMENT is a string or a character it gets inserted (see also
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184 `skeleton-transformation'). Other possibilities are:
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185
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186 \\n go to next line and indent according to mode
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187 _ interesting point, interregion here, point after termination
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188 > indent line (or interregion if > _) according to major mode
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189 & do next ELEMENT if previous moved point
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190 | do next ELEMENT if previous didn't move point
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191 -num delete num preceding characters (see `skeleton-untabify')
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192 resume: skipped, continue here if quit is signaled
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193 nil skipped
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194
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195 Further elements can be defined via `skeleton-further-elements'. ELEMENT may
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196 itself be a SKELETON with an INTERACTOR. The user is prompted repeatedly for
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197 different inputs. The SKELETON is processed as often as the user enters a
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198 non-empty string. \\[keyboard-quit] terminates skeleton insertion, but
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199 continues after `resume:' and positions at `_' if any. If INTERACTOR in such
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200 a subskeleton is a prompt-string which contains a \".. %s ..\" it is
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201 formatted with `skeleton-subprompt'. Such an INTERACTOR may also a list of
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202 strings with the subskeleton being repeated once for each string.
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203
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204 Quoted lisp-expressions are evaluated evaluated for their side-effect.
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205 Other lisp-expressions are evaluated and the value treated as above.
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206 Note that expressions may not return `t' since this impplies an
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207 endless loop. Modes can define other symbols by locally setting them
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208 to any valid skeleton element. The following local variables are
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209 available:
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210
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211 str first time: read a string according to INTERACTOR
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212 then: insert previously read string once more
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213 help help-form during interaction with the user or `nil'
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214 input initial input (string or cons with index) while reading str
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215 v1, v2 local variables for memorising anything you want
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216
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217 When done with skeleton, but before going back to `_'-point call
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218 `skeleton-end-hook' if that is non-`nil'."
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219 (and skeleton-regions
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220 (setq skeleton-regions
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221 (if (> skeleton-regions 0)
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222 (list (point-marker)
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223 (save-excursion (forward-word skeleton-regions)
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224 (point-marker)))
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225 (setq skeleton-regions (- skeleton-regions))
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226 ;; copy skeleton-regions - 1 elements from `mark-ring'
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227 (let ((l1 (cons (mark-marker) mark-ring))
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228 (l2 (list (point-marker))))
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229 (while (and l1 (> skeleton-regions 0))
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230 (setq l2 (cons (car l1) l2)
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231 skeleton-regions (1- skeleton-regions)
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232 l1 (cdr l1)))
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233 (sort l2 '<))))
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234 (goto-char (car skeleton-regions))
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235 (setq skeleton-regions (cdr skeleton-regions)))
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236 (let ((beg (point))
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237 skeleton-modified skeleton-point resume: help input v1 v2)
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238 (unwind-protect
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239 (eval `(let ,skeleton-further-elements
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240 (skeleton-internal-list skeleton str)))
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241 (run-hooks 'skeleton-end-hook)
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242 (sit-for 0)
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243 (or (pos-visible-in-window-p beg)
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244 (progn
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245 (goto-char beg)
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246 (recenter 0)))
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247 (if skeleton-point
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248 (goto-char skeleton-point)))))
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249
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250 (defun skeleton-read (str &optional initial-input recursive)
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251 "Function for reading a string from the minibuffer within skeletons.
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252 PROMPT may contain a `%s' which will be replaced by `skeleton-subprompt'.
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253 If non-`nil' second arg INITIAL-INPUT or variable `input' is a string or
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254 cons with index to insert before reading. If third arg RECURSIVE is non-`nil'
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255 i.e. we are handling the iterator of a subskeleton, returns empty string if
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256 user didn't modify input.
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257 While reading, the value of `minibuffer-help-form' is variable `help' if that
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258 is non-`nil' or a default string."
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259 (let ((minibuffer-help-form (or (if (boundp 'help) (symbol-value 'help))
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260 (if recursive "\
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261 As long as you provide input you will insert another subskeleton.
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262
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263 If you enter the empty string, the loop inserting subskeletons is
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264 left, and the current one is removed as far as it has been entered.
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265
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266 If you quit, the current subskeleton is removed as far as it has been
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267 entered. No more of the skeleton will be inserted, except maybe for a
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268 syntactically necessary termination."
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269 "\
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270 You are inserting a skeleton. Standard text gets inserted into the buffer
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271 automatically, and you are prompted to fill in the variable parts.")))
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272 (eolp (eolp)))
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273 ;; since Emacs doesn't show main window's cursor, do something noticeable
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274 (or eolp
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275 (open-line 1))
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276 (unwind-protect
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277 (setq str (if (stringp str)
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278 (read-string (format str skeleton-subprompt)
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279 (setq initial-input
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280 (or initial-input
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281 (symbol-value 'input))))
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282 (eval str)))
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283 (or eolp
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284 (delete-char 1))))
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285 (if (and recursive
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286 (or (null str)
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287 (string= str "")
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288 (equal str initial-input)
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289 (equal str (car-safe initial-input))))
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290 (signal 'quit t)
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291 str))
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292
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293 (defun skeleton-internal-list (skeleton &optional str recursive)
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294 (let* ((start (save-excursion (beginning-of-line) (point)))
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295 (column (current-column))
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296 (line (buffer-substring start
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297 (save-excursion (end-of-line) (point))))
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298 opoint)
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299 (or str
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300 (setq str `(setq str (skeleton-read ',(car skeleton) nil ,recursive))))
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301 (while (setq skeleton-modified (eq opoint (point))
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302 opoint (point)
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303 skeleton (cdr skeleton))
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304 (condition-case quit
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305 (skeleton-internal-1 (car skeleton))
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306 (quit
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307 (if (eq (cdr quit) 'recursive)
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308 (setq recursive 'quit
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309 skeleton (memq 'resume: skeleton))
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310 ;; remove the subskeleton as far as it has been shown
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311 ;; the subskeleton shouldn't have deleted outside current line
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312 (end-of-line)
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313 (delete-region start (point))
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314 (insert line)
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315 (move-to-column column)
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316 (if (cdr quit)
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317 (setq skeleton ()
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318 recursive nil)
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319 (signal 'quit 'recursive)))))))
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320 ;; maybe continue loop or go on to next outer resume: section
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321 (if (eq recursive 'quit)
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322 (signal 'quit 'recursive)
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323 recursive))
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324
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325
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326 (defun skeleton-internal-1 (element &optional literal)
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327 (cond ((char-or-string-p element)
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328 (if (and (integerp element) ; -num
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329 (< element 0))
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330 (if skeleton-untabify
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331 (backward-delete-char-untabify (- element))
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332 (delete-backward-char (- element)))
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333 (insert-before-markers (if (and skeleton-transformation
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334 (not literal))
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335 (funcall skeleton-transformation element)
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336 element))))
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337 ((eq element '\n) ; actually (eq '\n 'n)
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338 (if (and skeleton-regions
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339 (eq (nth 1 skeleton) '_))
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340 (progn
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341 (or (eolp)
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342 (newline))
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343 (indent-region (point) (car skeleton-regions) nil))
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344 (if skeleton-newline-indent-rigidly
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345 (indent-to (prog1 (current-indentation)
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346 (newline)))
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347 (newline)
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348 (indent-according-to-mode))))
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349 ((eq element '>)
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350 (if (and skeleton-regions
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351 (eq (nth 1 skeleton) '_))
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352 (indent-region (point) (car skeleton-regions) nil)
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353 (indent-according-to-mode)))
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354 ((eq element '_)
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355 (if skeleton-regions
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356 (progn
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357 (goto-char (car skeleton-regions))
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358 (setq skeleton-regions (cdr skeleton-regions))
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359 (and (<= (current-column) (current-indentation))
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360 (eq (nth 1 skeleton) '\n)
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361 (end-of-line 0)))
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362 (or skeleton-point
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363 (setq skeleton-point (point)))))
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364 ((eq element '&)
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365 (if skeleton-modified
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366 (setq skeleton (cdr skeleton))))
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367 ((eq element '|)
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368 (or skeleton-modified
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369 (setq skeleton (cdr skeleton))))
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370 ((eq 'quote (car-safe element))
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371 (eval (nth 1 element)))
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372 ((or (stringp (car-safe element))
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373 (consp (car-safe element)))
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374 (if (symbolp (car-safe (car element)))
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375 (while (skeleton-internal-list element nil t))
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376 (setq literal (car element))
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377 (while literal
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378 (skeleton-internal-list element (car literal))
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379 (setq literal (cdr literal)))))
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380 ((null element))
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381 ((skeleton-internal-1 (eval element) t))))
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382
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383
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384 ;; Maybe belongs into simple.el or elsewhere
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385
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386 (define-skeleton local-variables-section
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387 "Insert a local variables section. Use current comment syntax if any."
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388 ()
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389 '(save-excursion
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390 (if (re-search-forward page-delimiter nil t)
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391 (error "Not on last page.")))
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392 comment-start "Local Variables:" comment-end \n
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393 comment-start "mode: "
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394 (completing-read "Mode: " obarray
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395 (lambda (symbol)
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396 (if (commandp symbol)
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397 (string-match "-mode$" (symbol-name symbol))))
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398 t)
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399 & -5 | '(kill-line 0) & -1 | comment-end \n
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400 ( (completing-read (format "Variable, %s: " skeleton-subprompt)
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401 obarray
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402 (lambda (symbol)
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403 (or (eq symbol 'eval)
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404 (user-variable-p symbol)))
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405 t)
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406 comment-start str ": "
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407 (read-from-minibuffer "Expression: " nil read-expression-map nil
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408 'read-expression-history) | _
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409 comment-end \n)
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410 resume:
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411 comment-start "End:" comment-end)
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412
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413 ;; Variables and command for automatically inserting pairs like () or "".
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414
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415 (defvar skeleton-pair nil
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416 "*If this is nil pairing is turned off, no matter what else is set.
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417 Otherwise modes with `skeleton-pair-insert-maybe' on some keys
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418 will attempt to insert pairs of matching characters.")
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419
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420
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421 (defvar skeleton-pair-on-word nil
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422 "*If this is nil, paired insertion is inhibited before or inside a word.")
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423
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424
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425 (defvar skeleton-pair-filter (lambda ())
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426 "Attempt paired insertion if this function returns nil, before inserting.
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427 This allows for context-sensitive checking whether pairing is appropriate.")
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428
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429
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430 (defvar skeleton-pair-alist ()
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431 "An override alist of pairing partners matched against `last-command-char'.
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432 Each alist element, which looks like (ELEMENT ...), is passed to
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433 `skeleton-insert' with no interactor. Variable `str' does nothing.
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434
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435 Elements might be (?` ?` _ \"''\"), (?\\( ? _ \" )\") or (?{ \\n > _ \\n ?} >).")
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436
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437
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438 ;;;###autoload
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439 (defun skeleton-pair-insert-maybe (arg)
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440 "Insert the character you type ARG times.
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441
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442 With no ARG, if `skeleton-pair' is non-nil, and if
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443 `skeleton-pair-on-word' is non-nil or we are not before or inside a
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444 word, and if `skeleton-pair-filter' returns nil, pairing is performed.
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445
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446 If a match is found in `skeleton-pair-alist', that is inserted, else
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447 the defaults are used. These are (), [], {}, <> and `' for the
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448 symmetrical ones, and the same character twice for the others."
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449 (interactive "*P")
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450 (if (or arg
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451 overwrite-mode
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452 (not skeleton-pair)
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453 (if (not skeleton-pair-on-word) (looking-at "\\w"))
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454 (funcall skeleton-pair-filter))
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455 (self-insert-command (prefix-numeric-value arg))
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456 (self-insert-command 1)
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457 (if skeleton-abbrev-cleanup
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458 ()
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459 ;; (preceding-char) is stripped of any Meta-stuff in last-command-char
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460 (if (setq arg (assq (preceding-char) skeleton-pair-alist))
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461 ;; typed char is inserted (car is no real interactor)
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462 (let (skeleton-end-hook)
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463 (skeleton-insert arg))
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464 (save-excursion
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465 (insert (or (cdr (assq (preceding-char)
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466 '((?( . ?))
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467 (?[ . ?])
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468 (?{ . ?})
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469 (?< . ?>)
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470 (?` . ?'))))
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471 last-command-char)))))))
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472
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473
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474 ;;; ;; A more serious example can be found in sh-script.el
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475 ;;; ;; The quote before (defun prevents this from being byte-compiled.
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476 ;;;(defun mirror-mode ()
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477 ;;; "This major mode is an amusing little example of paired insertion.
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478 ;;;All printable characters do a paired self insert, while the other commands
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479 ;;;work normally."
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480 ;;; (interactive)
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481 ;;; (kill-all-local-variables)
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482 ;;; (make-local-variable 'pair)
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483 ;;; (make-local-variable 'pair-on-word)
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484 ;;; (make-local-variable 'pair-filter)
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485 ;;; (make-local-variable 'pair-alist)
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486 ;;; (setq major-mode 'mirror-mode
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487 ;;; mode-name "Mirror"
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488 ;;; pair-on-word t
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489 ;;; ;; in the middle column insert one or none if odd window-width
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490 ;;; pair-filter (lambda ()
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491 ;;; (if (>= (current-column)
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492 ;;; (/ (window-width) 2))
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493 ;;; ;; insert both on next line
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494 ;;; (next-line 1)
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495 ;;; ;; insert one or both?
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496 ;;; (= (* 2 (1+ (current-column)))
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497 ;;; (window-width))))
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498 ;;; ;; mirror these the other way round as well
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499 ;;; pair-alist '((?) _ ?()
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500 ;;; (?] _ ?[)
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501 ;;; (?} _ ?{)
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502 ;;; (?> _ ?<)
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503 ;;; (?/ _ ?\\)
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504 ;;; (?\\ _ ?/)
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505 ;;; (?` ?` _ "''")
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506 ;;; (?' ?' _ "``"))
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507 ;;; ;; in this mode we exceptionally ignore the user, else it's no fun
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508 ;;; pair t)
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509 ;;; (let ((map (make-keymap))
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510 ;;; (i ? ))
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511 ;;; (use-local-map map)
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512 ;;; (setq map (car (cdr map)))
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513 ;;; (while (< i ?\^?)
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514 ;;; (aset map i 'skeleton-pair-insert-maybe)
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515 ;;; (setq i (1+ i))))
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516 ;;; (run-hooks 'mirror-mode-hook))
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517
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518 ;; skeleton.el ends here
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