emu.el (split-string) (with-temp-buffer) (with-current-buffer) (save-current-buffer...

[elisp/apel.git] / emu.el

diff --git a/emu.el b/emu.el
index ffdbd72..934abd6 100644 (file)
--- a/emu.el
+++ b/emu.el
@@ -100,14 +100,23 @@
   (or (and running-xemacs-19 (>= emacs-minor-version 14))
       running-xemacs-20-or-later))
 
-(cond (running-mule-merged-emacs
+(cond (running-xemacs
+       ;; for XEmacs
+       (require 'emu-xemacs)
+       (cond ((featurep 'mule)
+             ;; for XEmacs with MULE
+             (require 'emu-20)
+             (require 'emu-x20)
+             )
+            (t
+             ;; for XEmacs without MULE
+             (require 'emu-latin1)
+             ))
+       )
+      (running-mule-merged-emacs
        ;; for Emacs 20.1 and 20.2
        (require 'emu-e20)
        )
-      (running-xemacs-with-mule
-       ;; for XEmacs with mule
-       (require 'emu-x20)
-       )
       ((boundp 'MULE)
        ;; for MULE 1.* and 2.*
        (require 'emu-mule)
@@ -117,7 +126,8 @@
        (require 'emu-nemacs)
        )
       (t
-       ;; for Emacs 19 and XEmacs without mule
+       ;; for Emacs 19
+       (require 'emu-e19)
        (require 'emu-latin1)
        ))
 
@@ -264,6 +274,22 @@ Value is nil if OBJECT is not a buffer or if it has been killed.
              (list 'select-window 'save-selected-window-window))))
 
 
+;;; @ Emacs 20.3 emulation
+;;;
+
+(defmacro-maybe string-as-unibyte (string)
+  "Return a unibyte string with the same individual bytes as STRING.
+If STRING is unibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+  string)
+
+(defmacro-maybe string-as-multibyte (string)
+  "Return a multibyte string with the same individual bytes as STRING.
+If STRING is multibyte, the result is STRING itself.
+\[Emacs 20.3 emulating macro]"
+  string)
+
+
 ;;; @ XEmacs emulation
 ;;;
 
@@ -307,6 +333,54 @@ This function does not move point. [XEmacs emulating function]"
     )
 
 
+;;; @ for Emacs 19,18
+;;;
+
+(defmacro-maybe save-current-buffer (&rest body)
+  "Save the current buffer; execute BODY; restore the current buffer.
+Executes BODY just like `progn'."
+  (` (let ((orig-buffer (current-buffer)))
+       (unwind-protect
+          (progn (,@ body))
+        (set-buffer orig-buffer)))))
+
+;; This macro was imported XEmacs 21.
+(defmacro-maybe with-current-buffer (buffer &rest body)
+  "Execute the forms in BODY with BUFFER as the current buffer.
+The value returned is the value of the last form in BODY.
+See also `with-temp-buffer'."
+  (` (save-current-buffer
+       (set-buffer (, buffer))
+       (,@ body))))
+
+;; This macro was imported XEmacs 21.
+(defmacro-maybe with-temp-buffer (&rest forms)
+  "Create a temporary buffer, and evaluate FORMS there like `progn'.
+See also `with-temp-file' and `with-output-to-string'."
+  (let ((temp-buffer (make-symbol "temp-buffer")))
+    (` (let (((, temp-buffer)
+             (get-buffer-create (generate-new-buffer-name " *temp*"))))
+        (unwind-protect
+            (with-current-buffer (, temp-buffer)
+              (,@ forms))
+          (and (buffer-name (, temp-buffer))
+               (kill-buffer (, temp-buffer))))))))
+
+;; This function was imported from XEmacs 21.
+(defun-maybe split-string (string &optional pattern)
+  "Return a list of substrings of STRING which are separated by PATTERN.
+If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
+  (or pattern
+      (setq pattern "[ \f\t\n\r\v]+"))
+  ;; The FSF version of this function takes care not to cons in case
+  ;; of infloop.  Maybe we should synch?
+  (let (parts (start 0))
+    (while (string-match pattern string start)
+      (setq parts (cons (substring string start (match-beginning 0)) parts)
+           start (match-end 0)))
+    (nreverse (cons (substring string start) parts))))
+
+
 ;;; @ for text/richtext and text/enriched
 ;;;