(defvar-maybe): New macro.

(temporary-file-directory): New variable.

diff --git a/poe.el b/poe.el
index b06f46a..9c00b52 100644 (file)
--- a/poe.el
+++ b/poe.el
@@ -24,6 +24,17 @@
 
 ;;; Code:
 
+(defmacro defvar-maybe (name &rest everything-else)
+  (or (and (boundp name)
+          (not (get name 'defvar-maybe))
+          )
+      (` (or (boundp (quote (, name)))
+            (progn
+              (defvar (, name) (,@ everything-else))
+              (put (quote (, name)) 'defvar-maybe t)
+              ))
+        )))
+
 (defmacro defun-maybe (name &rest everything-else)
   (or (and (fboundp name)
           (not (get name 'defun-maybe))
@@ -163,7 +174,7 @@ See `read-from-minibuffer' for details of HISTORY argument."
 ;;; @ Emacs 19.30 emulation
 ;;;
 
-;; This function was imported Emacs 19.30.
+;; imported from Emacs 19.30.
 (defun-maybe add-to-list (list-var element)
   "Add to the value of LIST-VAR the element ELEMENT if it isn't there yet.
 If you want to use `add-to-list' on a variable that is not defined
@@ -202,7 +213,7 @@ Value is nil if OBJECT is not a buffer or if it has been killed.
        (get-buffer object)
        (buffer-name (get-buffer object))))
 
-;; This macro was imported Emacs 19.33.
+;; imported from Emacs 19.33.
 (defmacro-maybe save-selected-window (&rest body)
   "Execute BODY, then select the window that was selected before BODY.
 \[Emacs 19.31 emulating function]"
@@ -216,12 +227,12 @@ Value is nil if OBJECT is not a buffer or if it has been killed.
 ;;; @ Emacs 20.1 emulation
 ;;;
 
-;; This macro was imported Emacs 20.2.
+;; imported from Emacs 20.2.
 (defmacro-maybe when (cond &rest body)
   "(when COND BODY...): if COND yields non-nil, do BODY, else return nil."
   (list 'if cond (cons 'progn body)))
 
-;; This macro was imported Emacs 20.3.
+;; imported from Emacs 20.3.
 (defmacro-maybe unless (cond &rest body)
   "(unless COND BODY...): if COND yields nil, do BODY, else return nil."
   (cons 'if (cons cond (cons nil body))))
@@ -234,7 +245,7 @@ Executes BODY just like `progn'."
           (progn (,@ body))
         (set-buffer orig-buffer)))))
 
-;; This macro was imported Emacs 20.2.
+;; imported from Emacs 20.2.
 (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.
@@ -243,7 +254,7 @@ See also `with-temp-buffer'."
        (set-buffer (, buffer))
        (,@ body))))
 
-;; This macro was imported Emacs 20.2.
+;; imported from Emacs 20.2.
 (defmacro-maybe with-temp-file (file &rest forms)
   "Create a new buffer, evaluate FORMS there, and write the buffer to FILE.
 The value of the last form in FORMS is returned, like `progn'.
@@ -263,7 +274,7 @@ See also `with-temp-buffer'."
           (and (buffer-name (, temp-buffer))
                (kill-buffer (, temp-buffer))))))))
 
-;; This macro was imported Emacs 20.2.
+;; imported from Emacs 20.2.
 (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'."
@@ -276,7 +287,7 @@ See also `with-temp-file' and `with-output-to-string'."
           (and (buffer-name (, temp-buffer))
                (kill-buffer (, temp-buffer))))))))
 
-;; This function was imported Emacs 20.3.
+;; imported from Emacs 20.3.
 (defun-maybe last (x &optional n)
   "Return the last link of the list X.  Its car is the last element.
 If X is nil, return nil.
@@ -292,13 +303,13 @@ If N is bigger than the length of X, return X."
       (setq x (cdr x)))
     x))
 
-;; This function was imported Emacs 20.3. (cl function)
+;; imported from Emacs 20.3. (cl function)
 (defun-maybe butlast (x &optional n)
   "Returns a copy of LIST with the last N elements removed."
   (if (and n (<= n 0)) x
     (nbutlast (copy-sequence x) n)))
 
-;; This function was imported Emacs 20.3. (cl function)
+;; imported from Emacs 20.3. (cl function)
 (defun-maybe nbutlast (x &optional n)
   "Modifies LIST to remove the last N elements."
   (let ((m (length x)))
@@ -308,7 +319,7 @@ If N is bigger than the length of X, return X."
           (if (> n 0) (setcdr (nthcdr (- (1- m) n) x) nil))
           x))))
 
-;; This function was imported from XEmacs 21.
+;; 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]+\"."
@@ -326,6 +337,17 @@ If PATTERN is omitted, it defaults to \"[ \\f\\t\\n\\r\\v]+\"."
 ;;; @ Emacs 20.3 emulation
 ;;;
 
+;; imported from Emacs 20.3.91.
+(defvar-maybe temporary-file-directory
+  (file-name-as-directory
+   (cond ((memq system-type '(ms-dos windows-nt))
+         (or (getenv "TEMP") (getenv "TMPDIR") (getenv "TMP") "c:/temp"))
+        ((memq system-type '(vax-vms axp-vms))
+         (or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP") "SYS$SCRATCH:"))
+        (t
+         (or (getenv "TMPDIR") (getenv "TMP") (getenv "TEMP") "/tmp"))))
+  "The directory for writing temporary files.")
+
 (defun-maybe line-beginning-position (&optional n)
   "Return the character position of the first character on the current line.
 With argument N not nil or 1, move forward N - 1 lines first.