Make epa-file progress message user-friendly.

* epa.el (epa-progress-callback-function): Fix the logic of
displaying progress.
* epa-file.el (epa-file-insert-file-contents): Make progress
display more user-friendly.
(epa-file-write-region): Ditto.

lisp/ChangeLog

+2011-08-12  Daiki Ueno  <ueno@unixuser.org>
+
+	* epa.el (epa-progress-callback-function): Fix the logic of
+	displaying progress.
+	* epa-file.el (epa-file-insert-file-contents): Make progress
+	display more user-friendly.
+	(epa-file-write-region): Ditto.
+
 2011-08-10  Chong Yidong  <cyd@stupidchicken.com>
 
 	* subr.el (string-mark-left-to-right): New function.

lisp/epa-file.el

@@ -137,8 +137,10 @@ encryption is used."
      context
      (cons #'epa-file-passphrase-callback-function
 	   local-file))
-    (epg-context-set-progress-callback context
-				       #'epa-progress-callback-function)
+    (epg-context-set-progress-callback
+     context
+     (cons #'epa-progress-callback-function
+	   (format "Decrypting %s" file)))
     (unwind-protect
 	(progn
 	  (if replace
@@ -211,8 +213,10 @@ encryption is used."
      context
      (cons #'epa-file-passphrase-callback-function
 	   file))
-    (epg-context-set-progress-callback context
-				       #'epa-progress-callback-function)
+    (epg-context-set-progress-callback
+     context
+     (cons #'epa-progress-callback-function
+	   (format "Encrypting %s" file)))
     (epg-context-set-armor context epa-armor)
     (condition-case error
 	(setq string

lisp/epa.el

@@ -651,10 +651,17 @@ If SECRET is non-nil, list secret keys instead of public keys."
 
 (defun epa-progress-callback-function (_context what _char current total
 					       handback)
-  (message "%s%d%% (%d/%d)" (or handback
-				(concat what ": "))
-	   (if (> total 0) (floor (* (/ current (float total)) 100)) 0)
-	   current total))
+  (let ((prompt (or handback
+		    (format "Processing %s: " what))))
+    ;; According to gnupg/doc/DETAIL: a "total" of 0 indicates that
+    ;; the total amount is not known. The condition TOTAL && CUR ==
+    ;; TOTAL may be used to detect the end of an operation.
+    (if (> total 0)
+	(if (= current total)
+	    (message "%s...done" prompt)
+	  (message "%s...%d%%" prompt
+		   (floor (* (/ current (float total)) 100))))
+      (message "%s..." prompt))))
 
 ;;;###autoload
 (defun epa-decrypt-file (file)