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

[John-David T. Smith]

Index: emacs/lisp/comint.el
diff -u emacs/lisp/comint.el:1.337 emacs/lisp/comint.el:1.338
--- emacs/lisp/comint.el:1.337  Mon Mar 27 08:50:20 2006
+++ emacs/lisp/comint.el        Tue Apr 18 23:48:53 2006
@@ -465,6 +465,7 @@
     (define-key map "\C-c\C-l"           'comint-dynamic-list-input-ring)
     (define-key map "\C-c\C-n"           'comint-next-prompt)
     (define-key map "\C-c\C-p"           'comint-previous-prompt)
+    (define-key map "\C-c\C-j"           'comint-restore-input)
     (define-key map "\C-c\C-d"           'comint-send-eof)
     (define-key map "\C-c\C-s"           'comint-write-output)
     (define-key map "\C-c."      'comint-insert-previous-argument)
@@ -558,6 +559,9 @@
   "Non-nil if you are accumulating input lines to send as input together.
 The command \\[comint-accumulate] sets this.")
 
+(defvar comint-stored-incomplete-input nil
+  "Stored input for history cycling.")
+
 (put 'comint-replace-by-expanded-history 'menu-enable 'comint-input-autoexpand)
 (put 'comint-input-ring 'permanent-local t)
 (put 'comint-input-ring-index 'permanent-local t)
@@ -638,6 +642,7 @@
   (make-local-variable 'comint-scroll-to-bottom-on-input)
   (make-local-variable 'comint-move-point-for-output)
   (make-local-variable 'comint-scroll-show-maximum-output)
+  (make-local-variable 'comint-stored-incomplete-input)
   ;; This makes it really work to keep point at the bottom.
   (make-local-variable 'scroll-conservatively)
   (setq scroll-conservatively 10000)
@@ -1015,6 +1020,16 @@
        (t
         arg)))
 
+(defun comint-restore-input ()
+  "Restore unfinished input."
+  (interactive)
+  (when comint-input-ring-index
+    (comint-delete-input)
+    (when (> (length comint-stored-incomplete-input) 0)
+      (insert comint-stored-incomplete-input)
+      (message "Input restored"))
+    (setq comint-input-ring-index nil)))
+
 (defun comint-search-start (arg)
   "Index to start a directional search, starting at `comint-input-ring-index'."
   (if comint-input-ring-index
@@ -1035,9 +1050,18 @@
                                arg)))
 
 (defun comint-previous-input (arg)
-  "Cycle backwards through input history."
+  "Cycle backwards through input history, saving input."
   (interactive "*p")
-  (comint-previous-matching-input "." arg))
+  (if (and comint-input-ring-index 
+          (or                 ;; leaving the "end" of the ring
+           (and (< arg 0)              ; going down
+                (eq comint-input-ring-index 0))
+           (and (> arg 0)              ; going up
+                (eq comint-input-ring-index 
+                    (1- (ring-length comint-input-ring)))))
+          comint-stored-incomplete-input)
+      (comint-restore-input)
+    (comint-previous-matching-input "." arg)))
 
 (defun comint-next-input (arg)
   "Cycle forwards through input history."
@@ -1077,6 +1101,14 @@
     (if (string-match regexp (ring-ref comint-input-ring n))
        n)))
 
+(defun comint-delete-input ()
+  "Delete all input between accumulation or process mark and point."
+  (delete-region
+   ;; Can't use kill-region as it sets this-command
+   (or  (marker-position comint-accum-marker)
+       (process-mark (get-buffer-process (current-buffer))))
+   (point-max)))
+
 (defun comint-previous-matching-input (regexp n)
   "Search backwards through input history for match for REGEXP.
 \(Previous history elements are earlier commands.)
@@ -1088,13 +1120,13 @@
     ;; Has a match been found?
     (if (null pos)
        (error "Not found")
+      ;; If leaving the edit line, save partial input
+      (if (null comint-input-ring-index)       ;not yet on ring
+         (setq comint-stored-incomplete-input
+               (funcall comint-get-old-input)))
       (setq comint-input-ring-index pos)
       (message "History item: %d" (1+ pos))
-      (delete-region
-       ;; Can't use kill-region as it sets this-command
-       (or  (marker-position comint-accum-marker)
-           (process-mark (get-buffer-process (current-buffer))))
-       (point))
+      (comint-delete-input)
       (insert (ring-ref comint-input-ring pos)))))
 
 (defun comint-next-matching-input (regexp n)