Commit b7797a3e authored by Karl Heuer's avatar Karl Heuer
Browse files

(shadows-compare-text-p): Add.

(shadow-same-file-or-nonexistent): Add.
(find-emacs-lisp-shadows): Use directory-file-name.
parent cb5b843e
......@@ -53,6 +53,10 @@
;;; Code:
(defvar shadows-compare-text-p nil
"*If non-nil, then shadowing files are reported only if their text differs.
This is slower, but filters out some innocuous shadowing.")
(defun find-emacs-lisp-shadows (&optional path)
"Return a list of Emacs Lisp files that create shadows.
This function does the work for `list-load-path-shadows'.
......@@ -78,7 +82,7 @@ See the documentation for `list-load-path-shadows' for further information."
(while path
(setq dir (file-truename (or (car path) ".")))
(setq dir (directory-file-name (file-truename (or (car path) "."))))
(if (member dir true-names)
;; We have already considered this PATH redundant directory.
;; Show the redundancy if we are interactiver, unless the PATH
......@@ -89,15 +93,15 @@ See the documentation for `list-load-path-shadows' for further information."
(and (car path)
(not (string= (car path) "."))
(message "Ignoring redundant directory %s" (car path))))
(setq true-names (append true-names (list dir)))
(setq dir (or (car path) "."))
(setq dir (directory-file-name (or (car path) ".")))
(setq curr-files (if (file-accessible-directory-p dir)
(directory-files dir nil ".\\.elc?$" t)))
(directory-files dir nil ".\\.elc?$" t)))
(and curr-files
(not noninteractive)
(message "Checking %d files in %s..." (length curr-files) dir))
(setq files-seen-this-dir nil)
(while curr-files
......@@ -117,10 +121,17 @@ See the documentation for `list-load-path-shadows' for further information."
(if (setq orig-dir (assoc file files))
;; This file was seen before, we have a shadowing.
;; Report it unless the files are identical.
(let ((base1 (concat (cdr orig-dir) "/" file))
(base2 (concat dir "/" file)))
(if (not (and shadows-compare-text-p
(concat base1 ".el") (concat base2 ".el"))
;; This is a bit strict, but safe.
(concat base1 ".elc") (concat base2 ".elc"))))
(setq shadows
(append shadows
(list (concat (cdr orig-dir) "/" file)
(concat dir "/" file))))
(append shadows (list base1 base2)))))
;; Not seen before, add it to the list of seen files.
(setq files (cons (cons file dir) files))))
......@@ -131,6 +142,19 @@ See the documentation for `list-load-path-shadows' for further information."
;; Return the list of shadowings.
;; Return true if neither file exists, or if both exist and have identical
;; contents.
(defun shadow-same-file-or-nonexistent (f1 f2)
(let ((exists1 (file-exists-p f1))
(exists2 (file-exists-p f2)))
(or (and (not exists1) (not exists2))
(and exists1 exists2
(or (equal (file-truename f1) (file-truename f2))
;; As a quick test, avoiding spawning a process, compare file
;; sizes.
(and (= (nth 7 (file-attributes f1))
(nth 7 (file-attributes f2)))
(zerop (call-process "cmp" nil nil nil "-s" f1 f2))))))))
(defun list-load-path-shadows ()
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