From: Chris Hanson <org/chris-hanson/cph>
Date: Mon, 2 Aug 1993 02:50:40 +0000 (+0000)
Subject: Add new procedure COMINT-RECORD-INPUT which is like RING-PUSH! except
X-Git-Tag: 20090517-FFI~8152
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=3c9f099bebf239e3976cb978ca5651ea7d068d2e;p=mit-scheme.git

Add new procedure COMINT-RECORD-INPUT which is like RING-PUSH! except
that it doesn't push the string argument if it is the same as the one
on the top of the ring.  This is usually desirable -- it's not
necessary to record more than one of a series of identical commands.
---

diff --git a/v7/src/edwin/comint.scm b/v7/src/edwin/comint.scm
index 0f2c162da..168f3ded4 100644
--- a/v7/src/edwin/comint.scm
+++ b/v7/src/edwin/comint.scm
@@ -1,6 +1,6 @@
 #| -*-Scheme-*-
 
-$Id: comint.scm,v 1.18 1992/11/17 17:36:00 cph Exp $
+$Id: comint.scm,v 1.19 1993/08/02 02:50:40 cph Exp $
 
 Copyright (c) 1991-1992 Massachusetts Institute of Technology
 
@@ -189,7 +189,7 @@ the input."
 	(let ((point (current-point)))
 	  (move-mark-to! (ref-variable comint-last-input-end) point)
 	  (if ((ref-variable comint-input-filter) string)
-	      (ring-push! (ref-variable comint-input-ring) string))
+	      (comint-record-input (ref-variable comint-input-ring) string))
 	  ((ref-variable comint-input-sentinel) string)
 	  (if delete?
 	      (delete-string mark point)
@@ -197,6 +197,11 @@ the input."
 	  (move-mark-to! mark point)
 	  (process-send-string process (string-append string terminator)))))))
 
+(define (comint-record-input ring string)
+  (if (or (ring-empty? ring)
+	  (not (string=? string (ring-ref ring 0))))
+      (ring-push! ring string)))
+
 (define-variable-per-buffer comint-get-old-input
   "Procedure that submits old text in comint mode.
 This procedure is called when return is typed while the point is in old text.