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428
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1 ;;; lib-complete.el --- Completion on the lisp search path
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2
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3 ;; Copyright (C) 1997 Free Software Foundation, Inc.
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4 ;; Copyright (C) Mike Williams <mike-w@cs.aukuni.ac.nz> 1991
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5
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6 ;; Author: Mike Williams <mike-w@cs.aukuni.ac.nz>
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7 ;; Maintainer: XEmacs Development Team
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8 ;; Keywords: lisp, extensions, dumped
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9 ;; Created: Sat Apr 20 17:47:21 1991
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10
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11 ;; This file is part of XEmacs.
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12
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13 ;; XEmacs is free software; you can redistribute it and/or modify it
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14 ;; under the terms of the GNU General Public License as published by
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15 ;; the Free Software Foundation; either version 2, or (at your option)
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16 ;; any later version.
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17
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18 ;; XEmacs is distributed in the hope that it will be useful, but
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19 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
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20 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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21 ;; General Public License for more details.
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22
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23 ;; You should have received a copy of the GNU General Public License
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24 ;; along with XEmacs; see the file COPYING. If not, write to the
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25 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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26 ;; Boston, MA 02111-1307, USA.
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27
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28 ;;; Synched up with: Not in FSF.
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29
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30 ;;; Commentary:
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31
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32 ;; This file is dumped with XEmacs.
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33
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34 ;; ========================================================================
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35 ;; lib-complete.el -- Completion on a search path
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36 ;; Author : Mike Williams <mike-w@cs.aukuni.ac.nz>
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37 ;; Created On : Sat Apr 20 17:47:21 1991
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38 ;; Last Modified By: Heiko M|nkel <muenkel@tnt.uni-hannover.de>
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39 ;; Additional XEmacs integration By: Chuck Thompson <cthomp@cs.uiuc.edu>
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40 ;; Last Modified On: Thu Jul 1 14:23:00 1994
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41 ;; ========================================================================
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42 ;; NOTE: XEmacs must be redumped if this file is changed.
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43 ;;
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44 ;; Copyright (C) Mike Williams <mike-w@cs.aukuni.ac.nz> 1991
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45 ;;
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46 ;; Keywords: utility, lisp
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47
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48 ;; Many thanks to Hallvard Furuseth <hallvard@ifi.uio.no> for his
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49 ;; helpful suggestions.
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50
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51 ;; The function locate-file is removed, because of its incompatibility
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52 ;; with the buildin function of the lemacs 19.10 (Heiko M|nkel).
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53
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54 ;; There is now the new function find-library in this package.
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55
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56 ;;; ChangeLog:
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57
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58 ;; 4/26/97: sb Mule-ize.
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59 ;; 6/24/1999 much rewriting from Bob Weiner
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60
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61 ;;; Code:
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62
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63 ;;=== Determine completions for filename in search path ===================
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64
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65 (defun library-all-completions (FILE SEARCH-PATH &optional FULL FAST)
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66 "Return all completions for FILE in any directory on SEARCH-PATH.
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67 If optional third argument FULL is non-nil, returned pathnames should be
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68 absolute rather than relative to some directory on the SEARCH-PATH.
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69 If optional fourth argument FAST is non-nil, don't sort the completions,
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70 or remove duplicates."
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71 (setq FILE (or FILE ""))
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72 (if (file-name-absolute-p FILE)
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73 ;; It's an absolute file name, so don't need SEARCH-PATH
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74 (progn
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75 (setq FILE (expand-file-name FILE))
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76 (file-name-all-completions
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77 (file-name-nondirectory FILE) (file-name-directory FILE)))
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78 (let ((subdir (file-name-directory FILE))
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79 (file (file-name-nondirectory FILE))
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80 all-completions)
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81 ;; Make list of completions in each directory on SEARCH-PATH
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82 (while SEARCH-PATH
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83 (let* ((dir (concat (file-name-as-directory
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84 (expand-file-name (car SEARCH-PATH)))
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85 subdir))
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86 (dir-prefix (if FULL dir subdir)))
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87 (if (file-directory-p dir)
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88 (let ((subdir-completions
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89 (file-name-all-completions file dir)))
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90 (while subdir-completions
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91 (setq all-completions
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92 (cons (concat dir-prefix (car subdir-completions))
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93 all-completions))
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94 (setq subdir-completions (cdr subdir-completions))))))
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95 (setq SEARCH-PATH (cdr SEARCH-PATH)))
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96 (if FAST all-completions
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97 (let ((sorted (nreverse (sort all-completions 'string<)))
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98 compressed)
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99 (while sorted
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100 (if (equal (car sorted) (car compressed)) nil
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101 (setq compressed (cons (car sorted) compressed)))
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102 (setq sorted (cdr sorted)))
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103 compressed)))))
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104
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105 ;;=== Utilities ===========================================================
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106
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107 (defmacro progn-with-message (message &rest forms)
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108 "(progn-with-message MESSAGE FORMS ...)
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109 Display MESSAGE and evaluate FORMS, returning value of the last one."
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110 ;; based on Hallvard Furuseth's funcall-with-message
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111 `(if (eq (selected-window) (minibuffer-window))
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112 (save-excursion
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113 (goto-char (point-max))
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114 (let ((orig-pmax (point-max)))
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115 (unwind-protect
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116 (progn
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117 (insert " " ,message) (goto-char orig-pmax)
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118 (sit-for 0) ; Redisplay
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119 ,@forms)
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120 (delete-region orig-pmax (point-max)))))
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121 (prog2
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122 (message "%s" ,message)
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123 (progn ,@forms)
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124 (message ""))))
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125
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126 (put 'progn-with-message 'lisp-indent-hook 1)
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127
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128 ;;=== Completion caching ==================================================
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129
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130 (defconst lib-complete:cache nil
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131 "Used within read-library and read-library-internal to prevent
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132 costly repeated calls to library-all-completions.
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133 Format is a list of lists of the form
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134
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135 ([<path> <subdir>] <cache-record> <cache-record> ...)
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136
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137 where each <cache-record> has the form
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138
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139 (<root> <modtimes> <completion-table>)")
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140
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141 (defun lib-complete:better-root (ROOT1 ROOT2)
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142 "Return non-nil if ROOT1 is a superset of ROOT2."
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143 (and (equal (file-name-directory ROOT1) (file-name-directory ROOT2))
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144 (string-match
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145 (concat "^" (regexp-quote (file-name-nondirectory ROOT1)))
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146 ROOT2)))
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147
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148 (defun lib-complete:get-completion-table (FILE PATH FILTER)
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149 (let* ((subdir (file-name-directory FILE))
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150 (root (file-name-nondirectory FILE))
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151 (PATH
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152 (mapcar
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153 (function (lambda (dir) (file-name-as-directory
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154 (expand-file-name (or dir "")))))
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155 PATH))
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156 (key (vector PATH subdir FILTER))
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157 (real-dirs
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158 (if subdir
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159 (mapcar (function (lambda (dir) (concat dir subdir))) PATH)
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160 PATH))
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161 (path-modtimes
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162 (mapcar
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163 (function (lambda (fn) (if fn (nth 5 (file-attributes fn)))))
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164 real-dirs))
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165 (cache-entry (assoc key lib-complete:cache))
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166 (cache-records (cdr cache-entry)))
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167 ;; Look for cached entry
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168 (catch 'table
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169 (while cache-records
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170 (if (and
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171 (lib-complete:better-root (nth 0 (car cache-records)) root)
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172 (equal (nth 1 (car cache-records)) path-modtimes))
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173 (throw 'table (nth 2 (car cache-records))))
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174 (setq cache-records (cdr cache-records)))
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175 ;; Otherwise build completions
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176 (let ((completion-list
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177 (progn-with-message "(building completion table...)"
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178 (library-all-completions FILE PATH nil 'fast)))
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179 (completion-table (make-vector 127 0)))
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180 (while completion-list
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181 (let ((completion
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182 (if (or (not FILTER)
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183 (file-directory-p (car completion-list)))
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184 (car completion-list)
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185 (funcall FILTER (car completion-list)))))
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186 (if completion
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187 (intern completion completion-table)))
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188 (setq completion-list (cdr completion-list)))
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189 ;; Cache the completions
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190 (lib-complete:cache-completions key root
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191 path-modtimes completion-table)
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192 completion-table))))
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193
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194 (defvar lib-complete:max-cache-size 40
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195 "*Maximum number of search paths which are cached.")
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196
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197 (defun lib-complete:cache-completions (key root modtimes table)
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198 (let* ((cache-entry (assoc key lib-complete:cache))
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199 (cache-records (cdr cache-entry))
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200 (new-cache-records (list (list root modtimes table))))
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201 (if (not cache-entry) nil
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202 ;; Remove old cache entry
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203 (setq lib-complete:cache (delq cache-entry lib-complete:cache))
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204 ;; Copy non-redundant entries from old cache entry
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205 (while cache-records
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206 (if (or (equal root (nth 0 (car cache-records)))
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207 (lib-complete:better-root root (nth 0 (car cache-records))))
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208 nil
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209 (setq new-cache-records
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210 (cons (car cache-records) new-cache-records)))
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211 (setq cache-records (cdr cache-records))))
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212 ;; Add entry to front of cache
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213 (setq lib-complete:cache
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214 (cons (cons key (nreverse new-cache-records)) lib-complete:cache))
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215 ;; Trim cache
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216 (let ((tail (nthcdr lib-complete:max-cache-size lib-complete:cache)))
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217 (if tail (setcdr tail nil)))))
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218
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219 ;;=== Read a filename, with completion in a search path ===================
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220
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221 (defun read-library-internal (FILE FILTER FLAG)
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222 "Don't call this."
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223 ;; Relies on read-library-internal-search-path being let-bound
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224 (let ((completion-table
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225 (lib-complete:get-completion-table
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226 FILE read-library-internal-search-path FILTER)))
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227 (cond
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228 ((not completion-table) nil)
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229 ;; Completion table is filtered before use, so the PREDICATE
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230 ;; argument is redundant.
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231 ((eq FLAG nil) (try-completion FILE completion-table nil))
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232 ((eq FLAG t) (all-completions FILE completion-table nil))
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233 ((eq FLAG 'lambda) (and (intern-soft FILE completion-table) t))
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234 )))
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235
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236 (defun read-library (PROMPT SEARCH-PATH &optional DEFAULT MUST-MATCH
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237 FULL FILTER)
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238 "Read library name, prompting with PROMPT and completing in directories
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239 from SEARCH-PATH. A nil in the search path represents the current
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240 directory. Completions for a given search-path are cached, with the
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241 cache being invalidated whenever one of the directories on the path changes.
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242 Default to DEFAULT if user enters a null string.
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243 Optional fourth arg MUST-MATCH non-nil means require existing file's name.
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244 Non-nil and non-t means also require confirmation after completion.
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245 Optional fifth argument FULL non-nil causes a full pathname, rather than a
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246 relative pathname, to be returned. Note that FULL implies MUST-MATCH.
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247 Optional sixth argument FILTER can be used to provide a function to
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248 filter the completions. This function is passed the filename, and should
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249 return a transformed filename (possibly a null transformation) or nil,
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250 indicating that the filename should not be included in the completions."
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251 (let* ((read-library-internal-search-path SEARCH-PATH)
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252 (library (completing-read PROMPT 'read-library-internal
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253 FILTER (or MUST-MATCH FULL) nil)))
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254 (cond
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255 ((equal library "") DEFAULT)
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256 (FULL (locate-file library read-library-internal-search-path
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257 '(".el" ".el.gz" ".elc")))
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258 (t library))))
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259
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260 (defun read-library-name (prompt)
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261 "PROMPTs for and returns an existing Elisp library name (without any suffix) or the empty string."
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262 (interactive)
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263 (let ((read-library-internal-search-path load-path))
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264 (completing-read prompt
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265 'read-library-internal
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266 (lambda (fn)
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267 (cond
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268 ((string-match "\\.el\\(\\.gz\\|\\.Z\\)?$" fn)
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269 (substring fn 0 (match-beginning 0)))))
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270 t nil)))
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271
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272 ;; NOTE: as a special case, read-library may be used to read a filename
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273 ;; relative to the current directory, returning a *relative* pathname
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274 ;; (read-file-name returns a full pathname).
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275 ;;
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276 ;; eg. (read-library "Local header: " '(nil) nil)
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277
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278 ;;=== Replacement for load-library with completion ========================
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279
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280 (defun load-library (library)
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281 "Load the library named LIBRARY.
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282 This is an interface to the function `load'."
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283 (interactive
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284 (list (read-library "Load library: " load-path nil nil nil
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285 (function (lambda (fn)
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286 (cond
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287 ((string-match "\\.elc?$" fn)
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288 (substring fn 0 (match-beginning 0))))))
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289 )))
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290 (load library))
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291
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292 ;;=== find-library with completion (Author: Bob Weiner) ===================
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293
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294 (defun find-library (library &optional codesys display-function)
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295 "Find and display in the current window the source for the Elisp LIBRARY.
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296 LIBRARY should be a name without any path information and may include or omit
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297 the \".el\" suffix. Under XEmacs/Mule, the optional second argument CODESYS
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298 specifies the coding system to use when decoding the file. Interactively,
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299 with a prefix argument, this prompts for the coding system. Optional third
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300 argument DISPLAY-FUNCTION must take two arguments, the filename to display
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301 and CODESYS. The default for DISPLAY-FUNCTION is `find-file'."
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302 (interactive
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303 (list (read-library-name "Find library: ")
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304 (if current-prefix-arg
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305 (read-coding-system "Coding System: "))))
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306 (let ((path (if (or (null library) (equal library ""))
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307 nil
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308 (locate-file library load-path
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309 ;; decompression doesn't work with Mule -slb
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310 (if (featurep 'mule)
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311 ":.el:.elc"
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312 ":.el:.el.gz:.el.Z:.elc")))))
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313 (if path (funcall (if (fboundp display-function)
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314 display-function 'find-file)
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315 path codesys)
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316 (error "(find-library): Cannot locate library `%s'" library))))
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317
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318 (defun find-library-other-window (library &optional codesys)
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319 "Find and display in another window the source for the Elisp LIBRARY.
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320 LIBRARY should be a name without any path information and may include or omit
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321 the \".el\" suffix. Under XEmacs/Mule, the optional second argument CODESYS
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322 specifies the coding system to use when decoding the file. Interactively,
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323 with a prefix argument, this prompts for the coding system."
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324 (interactive
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325 (list (read-library-name "Find library in other window: ")
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326 (if current-prefix-arg
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327 (read-coding-system "Coding System: "))))
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328 (find-library library codesys 'find-file-other-window))
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329
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330 (defun find-library-other-frame (library &optional codesys)
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331 "Find and display in another frame the source for the Elisp LIBRARY.
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332 LIBRARY should be a name without any path information and may include or omit
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333 the \".el\" suffix. Under XEmacs/Mule, the optional second argument CODESYS
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334 specifies the coding system to use when decoding the file. Interactively,
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335 with a prefix argument, this prompts for the coding system."
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336 (interactive
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337 (list (read-library-name "Find library in other frame: ")
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338 (if current-prefix-arg
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339 (read-coding-system "Coding System: "))))
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340 (find-library library codesys 'find-file-other-frame))
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341
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342 ;; This conflicts with an existing binding.
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343 ;;(define-key global-map "\C-xl" 'find-library)
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344 (define-key global-map "\C-x4l" 'find-library-other-window)
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345 (define-key global-map "\C-x5l" 'find-library-other-frame)
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346
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347 (provide 'lib-complete)
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348
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349 ;;; lib-complete.el ends here
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