X-Git-Url: https://git.distorted.org.uk/~mdw/lisp/blobdiff_plain/2d9f4fc0d90318686f2d2f691c893174ef1bbc0c..562ed2ddc451abe9be0ec5bb9684b2df56942d8f:/safely.lisp

diff --git a/safely.lisp b/safely.lisp
index 4830a99..9809f07 100644
--- a/safely.lisp
+++ b/safely.lisp
@@ -110,6 +110,13 @@
 	  (safely-trail safe))
     stream))
 
+(declaim (inline rename))
+(defun rename (old new)
+  (let ((target (make-pathname :directory '(:relative)
+			       :defaults new)))
+    #-clisp (rename-file old target)
+    #+clisp (rename-file old target :if-exists :overwrite)))
+
 (defun delete-file-without-moaning (file)
   "Delete the FILE, ignoring errors."
   (handler-case (delete-file file)
@@ -118,7 +125,7 @@
 (defun rename-file-without-moaning (old new)
   "Rename OLD to NEW, ignoring errors, and without doing any stupid name
    mangling."
-  (handler-case (rename-file old new)
+  (handler-case (rename old new)
     (file-error () nil)))
 
 (defun safely-unwind (trail)
@@ -166,6 +173,16 @@
 				(and from to
 				     (unix-link from to)))))
 
+  #+clisp
+  (generate-fresh-file-name file tag
+			    (lambda (name)
+			      (posix:copy-file (namestring file)
+					       (namestring name)
+					       :method :hardlink
+					       :if-exists nil)))
+
+
+
   #-(or cmu sbcl)
   ;; Otherwise just copy the file contents and hope for the best.
   (with-open-file (input file :element-type :default)
@@ -205,23 +222,23 @@
 	  (loop
 	    (unless trail
 	      (return))
-	      (let ((job (pop trail)))
-		(ecase (car job)
-		  (:shunt (destructuring-bind (tag new file) job
-			    (declare (ignore tag))
-			    (push `(:rmtmp ,new) revert)
-			    (if (probe-file file)
-				(let ((old (safe-copy file "old")))
-				  (push `(:rmtmp ,old) cleanup)
-				  (push `(:revert ,old ,file) revert))
-				(push `(:rmtmp ,file) revert))
-			    (rename-file new file)))
-		  (:delete (destructuring-bind (tag file) job
-			     (declare (ignore tag))
-			     (let ((old (safe-copy file "delete")))
-			       (push `(:revert ,old ,file) revert)
-			       (push `(:rmtmp ,old) cleanup)
-			       (delete-file file)))))))
+	    (let ((job (pop trail)))
+	      (ecase (car job)
+		(:shunt (destructuring-bind (tag new file) job
+			  (declare (ignore tag))
+			  (push `(:rmtmp ,new) revert)
+			  (if (probe-file file)
+			      (let ((old (safe-copy file "old")))
+				(push `(:rmtmp ,old) cleanup)
+				(push `(:revert ,old ,file) revert))
+			      (push `(:rmtmp ,file) revert))
+			  (rename new file)))
+		(:delete (destructuring-bind (tag file) job
+			   (declare (ignore tag))
+			   (let ((old (safe-copy file "delete")))
+			     (push `(:revert ,old ,file) revert)
+			     (push `(:rmtmp ,old) cleanup)
+			     (delete-file file)))))))
 	  (setf revert nil))
       (safely-unwind trail)
       (safely-unwind revert)