(insert-file-1): Compare file size to large-file-warning-threshold and request

confirmation when warranted.

1 files changed, 10 insertions, 0 deletions

diff --git a/lisp/files.el b/lisp/files.el
index 396e4c28b36..186dd8f3a0d 100644
--- a/lisp/files.el
+++ b/lisp/files.el
@@ -1695,6 +1695,16 @@ This function ensures that none of these modifications will take place."
   (if (file-directory-p filename)
       (signal 'file-error (list "Opening input file" "file is a directory"
                                 filename)))
+  ;; Check whether the file is uncommonly large (see find-file-noselect):
+  (let (size)
+    (when (and large-file-warning-threshold
+               (setq size (nth 7 (file-attributes filename)))
+               (> size large-file-warning-threshold)
+               (not (y-or-n-p
+                     (format "File %s is large (%dMB), really insert? "
+                             (file-name-nondirectory filename)
+                             (/ size 1048576)))))
+      (error "Aborted")))
   (let* ((buffer (find-buffer-visiting (abbreviate-file-name (file-truename filename))
                                        #'buffer-modified-p))
          (tem (funcall insert-func filename)))