[Emacs-diffs] Changes to emacs/lisp/subr.el

[Alan Mackenzie]

Index: emacs/lisp/subr.el
diff -u emacs/lisp/subr.el:1.510 emacs/lisp/subr.el:1.511
--- emacs/lisp/subr.el:1.510    Tue May 16 11:19:39 2006
+++ emacs/lisp/subr.el  Wed May 24 13:22:12 2006
@@ -1393,32 +1393,94 @@
                 t))
      nil))
 
+(defun load-history-regexp (file)
+  "Form a regexp to find FILE in load-history.
+FILE, a string, is described in eval-after-load's doc-string."
+  (if (file-name-absolute-p file)
+      (setq file (file-truename file)))
+  (concat (if (file-name-absolute-p file) "\\`" "\\<")
+         (regexp-quote file)
+         (if (file-name-extension file)
+             ""
+           ;; Note: regexp-opt can't be used here, since we need to call
+           ;; this before Emacs has been fully started.  2006-05-21
+           (concat "\\(" (mapconcat 'regexp-quote load-suffixes "\\|") "\\)?"))
+         "\\(" (mapconcat 'regexp-quote jka-compr-load-suffixes "\\|")
+         "\\)?\\'"))
+
+(defun load-history-filename-element (file-regexp)
+  "Get the first elt of load-history whose car matches FILE-REGEXP.
+Return nil if there isn't one."
+  (let* ((loads load-history)
+        (load-elt (and loads (car loads))))
+    (save-match-data
+      (while (and loads
+                 (or (null (car load-elt))
+                     (not (string-match file-regexp (car load-elt)))))
+       (setq loads (cdr loads)
+             load-elt (and loads (car loads)))))
+    load-elt))
+
 (defun eval-after-load (file form)
   "Arrange that, if FILE is ever loaded, FORM will be run at that time.
-This makes or adds to an entry on `after-load-alist'.
 If FILE is already loaded, evaluate FORM right now.
-It does nothing if FORM is already on the list for FILE.
-FILE must match exactly.  Normally FILE is the name of a library,
-with no directory or extension specified, since that is how `load'
-is normally called.
-FILE can also be a feature (i.e. a symbol), in which case FORM is
-evaluated whenever that feature is `provide'd."
-  (let ((elt (assoc file after-load-alist)))
-    ;; Make sure there is an element for FILE.
-    (unless elt (setq elt (list file)) (push elt after-load-alist))
-    ;; Add FORM to the element if it isn't there.
+
+If a matching file is loaded again, FORM will be evaluated again.
+
+If FILE is a string, it may be either an absolute or a relative file
+name, and may have an extension \(e.g. \".el\") or may lack one, and
+additionally may or may not have an extension denoting a compressed
+format \(e.g. \".gz\").
+
+When FILE is absolute, it is first converted to a true name by chasing
+out symbolic links.  Only a file of this name \(see next paragraph for
+extensions) will trigger the evaluation of FORM.  When FILE is relative,
+a file whose absolute true name ends in FILE will trigger evaluation.
+
+When FILE lacks an extension, a file name with any extension will trigger
+evaluation.  Otherwise, its extension must match FILE's.  A further
+extension for a compressed format \(e.g. \".gz\") on FILE will not affect
+this name matching.
+
+Alternatively, FILE can be a feature (i.e. a symbol), in which case FORM
+is evaluated whenever that feature is `provide'd.
+
+Usually FILE is just a library name like \"font-lock\" or a feature name
+like 'font-lock.
+
+This function makes or adds to an entry on `after-load-alist'."
+  ;; Add this FORM into after-load-alist (regardless of whether we'll be
+  ;; evaluating it now).
+  (let* ((regexp-or-feature
+         (if (stringp file) (load-history-regexp file) file))
+        (elt (assoc regexp-or-feature after-load-alist)))
+    (unless elt
+      (setq elt (list regexp-or-feature))
+      (push elt after-load-alist))
+    ;; Add FORM to the element unless it's already there.
     (unless (member form (cdr elt))
-      (nconc elt (list form))
-      ;; If the file has been loaded already, run FORM right away.
-      (if (if (symbolp file)
-             (featurep file)
-           ;; Make sure `load-history' contains the files dumped with
-           ;; Emacs for the case that FILE is one of them.
-           ;; (load-symbol-file-load-history)
-           (when (locate-library file)
-             (assoc (locate-library file) load-history)))
-         (eval form))))
-  form)
+      (nconc elt (list form)))
+
+    ;; Is there an already loaded file whose name (or `provide' name)
+    ;; matches FILE?
+    (if (if (stringp file)
+           (load-history-filename-element regexp-or-feature)
+         (featurep file))
+       (eval form))))
+
+(defun do-after-load-evaluation (abs-file)
+  "Evaluate all `eval-after-load' forms, if any, for ABS-FILE.
+ABS-FILE, a string, should be the absolute true name of a file just loaded."
+  (let ((after-load-elts after-load-alist)
+       a-l-element file-elements file-element form)
+    (while after-load-elts
+      (setq a-l-element (car after-load-elts)
+           after-load-elts (cdr after-load-elts))
+      (when (and (stringp (car a-l-element))
+                (string-match (car a-l-element) abs-file))
+       (while (setq a-l-element (cdr a-l-element)) ; discard the file name
+         (setq form (car a-l-element))
+         (eval form))))))
 
 (defun eval-next-after-load (file)
   "Read the following input sexp, and run it whenever FILE is loaded.