From: Chris Hanson <org/chris-hanson/cph>
Date: Mon, 22 May 2000 19:44:44 +0000 (+0000)
Subject: Implement WITH-OPEN-FOLDER, which guarantees that the folder is opened
X-Git-Tag: 20090517-FFI~3739
X-Git-Url: https://birchwood-abbey.net/git?a=commitdiff_plain;h=fe42fbd7d2714fc71c27f3574b584e6fef1c1f60;p=mit-scheme.git

Implement WITH-OPEN-FOLDER, which guarantees that the folder is opened
and closed as necessary.
---

diff --git a/v7/src/imail/imail-core.scm b/v7/src/imail/imail-core.scm
index 8f67c4880..c725bb219 100644
--- a/v7/src/imail/imail-core.scm
+++ b/v7/src/imail/imail-core.scm
@@ -1,6 +1,6 @@
 ;;; -*-Scheme-*-
 ;;;
-;;; $Id: imail-core.scm,v 1.83 2000/05/22 15:07:55 cph Exp $
+;;; $Id: imail-core.scm,v 1.84 2000/05/22 19:44:44 cph Exp $
 ;;;
 ;;; Copyright (c) 1999-2000 Massachusetts Institute of Technology
 ;;;
@@ -297,6 +297,15 @@
 
 (define-generic %open-folder (url))
 
+(define (with-open-folder url thunk)
+  (let ((folder (get-memoized-folder url)))
+    (if folder
+	(thunk)
+	(let ((folder (%open-folder url)))
+	  (let ((v (thunk)))
+	    (close-folder folder)
+	    v)))))
+
 ;; -------------------------------------------------------------------
 ;; Close FOLDER, freeing up connections, memory, etc.  Subsequent use
 ;; of the folder must work, but may incur a significant time or space