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annotate lisp/shadow.el @ 5794:2d20d57d4e7b
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| author | Jerry James <james@xemacs.org> |
|---|---|
| date | Wed, 07 May 2014 13:33:50 -0600 |
| parents | 308d34e9f07d |
| children |
| rev | line source |
|---|---|
| 428 | 1 ;;; shadow.el --- Locate Emacs Lisp file shadowings. |
| 2 | |
| 3 ;; Copyright (C) 1995 Free Software Foundation, Inc. | |
| 4 | |
| 5 ;; Author: Terry Jones <terry@santafe.edu> | |
| 6 ;; Keywords: lisp | |
| 7 ;; Created: 15 December 1995 | |
| 8 | |
| 9 ;; This file is part of XEmacs. | |
| 10 | |
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11 ;; XEmacs is free software: you can redistribute it and/or modify it |
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12 ;; under the terms of the GNU General Public License as published by the |
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13 ;; Free Software Foundation, either version 3 of the License, or (at your |
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14 ;; option) any later version. |
| 428 | 15 |
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16 ;; XEmacs is distributed in the hope that it will be useful, but WITHOUT |
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17 ;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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18 ;; FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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19 ;; for more details. |
| 428 | 20 |
| 21 ;; You should have received a copy of the GNU General Public License | |
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22 ;; along with XEmacs. If not, see <http://www.gnu.org/licenses/>. |
| 428 | 23 |
| 24 ;;; Commentary: | |
| 25 | |
| 26 ;; The functions in this file detect (`find-emacs-lisp-shadows') | |
| 27 ;; and display (`list-load-path-shadows') potential load-path | |
| 28 ;; problems that arise when Emacs Lisp files "shadow" each other. | |
| 29 ;; | |
| 30 ;; For example, a file XXX.el early in one's load-path will shadow | |
| 31 ;; a file with the same name in a later load-path directory. When | |
| 32 ;; this is unintentional, it may result in problems that could have | |
| 33 ;; been easily avoided. This occurs often (to me) when installing a | |
| 34 ;; new version of emacs and something in the site-lisp directory | |
| 35 ;; has been updated and added to the emacs distribution. The old | |
| 36 ;; version, now outdated, shadows the new one. This is obviously | |
| 37 ;; undesirable. | |
| 38 ;; | |
| 39 ;; The `list-load-path-shadows' function was run when you installed | |
| 40 ;; this version of emacs. To run it by hand in emacs: | |
| 41 ;; | |
| 42 ;; M-x load-library RET shadow RET | |
| 43 ;; M-x list-load-path-shadows | |
| 44 ;; | |
| 45 ;; or run it non-interactively via: | |
| 46 ;; | |
| 47 ;; emacs -batch -l shadow.el -f list-load-path-shadows | |
| 48 ;; | |
| 49 ;; Thanks to Francesco Potorti` <pot@cnuce.cnr.it> for suggestions, | |
| 50 ;; rewritings & speedups. | |
| 51 | |
| 52 ;; 1998-08-15 Martin Buchholz: Speed up using hash tables instead of lists. | |
| 53 | |
| 54 ;;; Code: | |
| 55 | |
| 56 (defun find-emacs-lisp-shadows (&optional path) | |
| 57 "Return a list of Emacs Lisp files that create shadows. | |
| 58 This function does the work for `list-load-path-shadows'. | |
| 59 | |
| 60 We traverse PATH looking for shadows, and return a \(possibly empty\) | |
| 61 even-length list of files. A file in this list at position 2i shadows | |
| 62 the file in position 2i+1. Emacs Lisp file suffixes \(.el and .elc\) | |
| 63 are stripped from the file names in the list. | |
| 64 | |
| 65 See the documentation for `list-load-path-shadows' for further information." | |
| 66 | |
| 67 (let (shadows ; List of shadowings, to be returned. | |
| 68 dir ; The dir being currently scanned. | |
| 69 curr-files ; This dir's Emacs Lisp files. | |
| 70 orig-dir ; Where the file was first seen. | |
| 71 (file-dirs ; File names ever seen, with dirs. | |
| 72 (make-hash-table :size 2000 :test 'equal)) | |
| 73 (true-names ; Dirs ever considered. | |
| 74 (make-hash-table :size 50 :test 'equal)) | |
| 75 (files-seen-this-dir ; Files seen so far in this dir. | |
| 76 (make-hash-table :size 100 :test 'equal)) | |
| 77 ) | |
| 78 | |
| 79 (dolist (path-elt (or path load-path)) | |
| 80 | |
| 81 (setq dir (file-truename (or path-elt "."))) | |
| 82 (if (gethash dir true-names) | |
| 83 ;; We have already considered this PATH redundant directory. | |
| 84 ;; Show the redundancy if we are interactive, unless the PATH | |
| 85 ;; dir is nil or "." (these redundant directories are just a | |
| 86 ;; result of the current working directory, and are therefore | |
| 87 ;; not always redundant). | |
| 88 (or noninteractive | |
| 89 (and path-elt | |
| 90 (not (string= path-elt ".")) | |
| 91 (message "Ignoring redundant directory %s" path-elt))) | |
| 92 | |
| 93 (puthash dir t true-names) | |
| 94 (setq dir (or path-elt ".")) | |
| 95 (setq curr-files (if (file-accessible-directory-p dir) | |
| 96 (directory-files dir nil ".\\.elc?$" t))) | |
| 97 (and curr-files | |
| 98 (not noninteractive) | |
| 99 (message "Checking %d files in %s..." (length curr-files) dir)) | |
| 100 | |
| 101 (clrhash files-seen-this-dir) | |
| 102 | |
| 103 (dolist (file curr-files) | |
| 104 | |
| 105 (setq file (substring | |
| 106 file 0 (if (string= (substring file -1) "c") -4 -3))) | |
| 107 | |
| 108 ;; FILE now contains the current file name, with no suffix. | |
| 109 (unless (or (gethash file files-seen-this-dir) | |
| 110 ;; Ignore these files. | |
| 111 (member file | |
| 112 '("subdirs" | |
| 113 "auto-autoloads" | |
| 114 "custom-load" | |
| 2562 | 115 "custom-defines" |
| 428 | 116 "dumped-lisp" |
| 117 "_pkg" | |
| 118 "lpath"))) | |
| 119 ;; File has not been seen yet in this directory. | |
| 120 ;; This test prevents us declaring that XXX.el shadows | |
| 121 ;; XXX.elc (or vice-versa) when they are in the same directory. | |
| 122 (puthash file t files-seen-this-dir) | |
| 123 | |
| 124 (if (setq orig-dir (gethash file file-dirs)) | |
| 125 ;; This file was seen before, we have a shadowing. | |
| 126 (setq shadows | |
| 127 (nconc shadows | |
| 128 (list (concat (file-name-as-directory orig-dir) | |
| 129 file) | |
| 130 (concat (file-name-as-directory dir) | |
| 131 file)))) | |
| 132 | |
| 133 ;; Not seen before, add it to the list of seen files. | |
| 134 (puthash file dir file-dirs)))))) | |
| 135 | |
| 136 ;; Return the list of shadowings. | |
| 137 shadows)) | |
| 138 | |
| 139 | |
| 140 ;;;###autoload | |
| 141 (defun list-load-path-shadows () | |
| 142 "Display a list of Emacs Lisp files that shadow other files. | |
| 143 | |
| 144 This function lists potential load-path problems. Directories in the | |
| 145 `load-path' variable are searched, in order, for Emacs Lisp | |
| 146 files. When a previously encountered file name is found again, a | |
| 147 message is displayed indicating that the later file is \"hidden\" by | |
| 148 the earlier. | |
| 149 | |
| 150 For example, suppose `load-path' is set to | |
| 151 | |
| 152 \(\"/usr/gnu/emacs/site-lisp\" \"/usr/gnu/emacs/share/emacs/19.30/lisp\"\) | |
| 153 | |
| 154 and that each of these directories contains a file called XXX.el. Then | |
| 155 XXX.el in the site-lisp directory is referred to by all of: | |
| 156 \(require 'XXX\), \(autoload .... \"XXX\"\), \(load-library \"XXX\"\) etc. | |
| 157 | |
| 158 The first XXX.el file prevents emacs from seeing the second \(unless | |
| 159 the second is loaded explicitly via load-file\). | |
| 160 | |
| 161 When not intended, such shadowings can be the source of subtle | |
| 162 problems. For example, the above situation may have arisen because the | |
| 163 XXX package was not distributed with versions of emacs prior to | |
| 164 19.30. An emacs maintainer downloaded XXX from elsewhere and installed | |
| 165 it. Later, XXX was updated and included in the emacs distribution. | |
| 166 Unless the emacs maintainer checks for this, the new version of XXX | |
| 167 will be hidden behind the old \(which may no longer work with the new | |
| 168 emacs version\). | |
| 169 | |
| 170 This function performs these checks and flags all possible | |
| 171 shadowings. Because a .el file may exist without a corresponding .elc | |
| 172 \(or vice-versa\), these suffixes are essentially ignored. A file | |
| 173 XXX.elc in an early directory \(that does not contain XXX.el\) is | |
| 174 considered to shadow a later file XXX.el, and vice-versa. | |
| 175 | |
| 176 When run interactively, the shadowings \(if any\) are displayed in a | |
| 177 buffer called `*Shadows*'. Shadowings are located by calling the | |
| 178 \(non-interactive\) companion function, `find-emacs-lisp-shadows'." | |
| 179 | |
| 180 (interactive) | |
| 181 (let* ((path (copy-sequence load-path)) | |
| 182 (tem path) | |
| 183 toplevs) | |
| 184 ;; If we can find simple.el in two places, | |
| 185 (while tem | |
| 186 (if (file-exists-p (expand-file-name "simple.el" (car tem))) | |
| 187 (setq toplevs (cons (car tem) toplevs))) | |
| 188 (setq tem (cdr tem))) | |
| 189 (if (> (length toplevs) 1) | |
| 190 ;; Cut off our copy of load-path right before | |
| 191 ;; the second directory which has simple.el in it. | |
| 192 ;; This avoids loads of duplications between the source dir | |
| 193 ;; and the dir where these files were copied by installation. | |
| 194 (let ((break (nth (- (length toplevs) 2) toplevs))) | |
| 195 (setq tem path) | |
| 196 (while tem | |
| 197 (if (eq (nth 1 tem) break) | |
| 198 (progn | |
| 199 (setcdr tem nil) | |
| 200 (setq tem nil))) | |
| 201 (setq tem (cdr tem))))) | |
| 202 | |
| 203 (let* ((shadows (find-emacs-lisp-shadows path)) | |
| 204 (n (/ (length shadows) 2)) | |
| 205 (msg (format "%s Emacs Lisp load-path shadowing%s found" | |
| 206 (if (zerop n) "No" (concat "\n" (number-to-string n))) | |
| 207 (if (= n 1) " was" "s were")))) | |
| 208 (if (interactive-p) | |
| 209 (save-excursion | |
| 210 ;; We are interactive. | |
| 211 ;; Create the *Shadows* buffer and display shadowings there. | |
| 212 (let ((output-buffer (get-buffer-create "*Shadows*"))) | |
| 213 (display-buffer output-buffer) | |
| 214 (set-buffer output-buffer) | |
| 215 (erase-buffer) | |
| 216 (while shadows | |
| 217 (insert (format "%s hides %s\n" (car shadows) | |
| 218 (car (cdr shadows)))) | |
| 219 (setq shadows (cdr (cdr shadows)))) | |
| 220 (insert msg "\n"))) | |
| 221 ;; We are non-interactive, print shadows via message. | |
| 222 (when shadows | |
| 223 (message "This site has duplicate Lisp libraries with the same name. | |
| 224 If a locally-installed Lisp library overrides a library in the Emacs release, | |
| 225 that can cause trouble, and you should probably remove the locally-installed | |
| 226 version unless you know what you are doing.\n") | |
| 227 (while shadows | |
| 228 (message "%s hides %s" (car shadows) (car (cdr shadows))) | |
| 229 (setq shadows (cdr (cdr shadows)))) | |
| 230 (message "%s" msg)))))) | |
| 231 | |
| 232 (provide 'shadow) | |
| 233 | |
| 234 ;;; shadow.el ends here |