Add command `file-notify-rm-all-watches'

* doc/lispref/os.texi (File Notifications):
Add `file-notify-rm-all-watches'.

* etc/NEWS: Mention 'file-notify-rm-all-watches'.  Fix typos.

* lisp/filenotify.el (file-notify-rm-all-watches): New defun.

* test/lisp/filenotify-tests.el (file-notify--test-cleanup):
Use `file-notify-rm-all-watches'.
(file-notify-test02-rm-watch): Test also `file-notify-rm-all-watches'.

doc/lispref/os.texi

@@ -3230,6 +3230,10 @@ Removes an existing file watch specified by its @var{descriptor}.
 @code{file-notify-add-watch}.
 @end defun
 
+@deffn Command file-notify-rm-all-watches
+Removes all existing file notification watches from Emacs.
+@end deffn
+
 @defun file-notify-valid-p descriptor
 Checks a watch specified by its @var{descriptor} for validity.
 @var{descriptor} should be an object returned by

etc/NEWS

@@ -28,7 +28,7 @@ applies, and please also update docstrings as needed.
 * Startup Changes in Emacs 29.1
 
 +++
-** Emacs now has a --fingerprint option.
+** Emacs now has a '--fingerprint' option.
 This will output a string identifying the current Emacs build.
 
 +++
@@ -73,7 +73,7 @@ point.
 
 ---
 *** Improved mouse behavior with auto-scrolling modes.
-When clicking inside the `scroll-margin' or `hscroll-margin' region
+When clicking inside the 'scroll-margin' or 'hscroll-margin' region
 the point is now moved only when releasing the mouse button.  This no
 longer results in a bogus selection, unless the mouse has been
 effectively dragged.
@@ -106,6 +106,8 @@ default, no automatic renaming is performed.
 The new command 'image-dired-unmark-all-marks' has been added with a
 binding in the menu.
 
+** info-look
+
 ---
 *** info-look specs can now be expanded at run time instead of a load time.
 The new ':doc-spec-function' element can be used to compute the
@@ -115,9 +117,9 @@ mode (instead of at load time).
 ** subr-x
 
 +++
-*** New macro 'with-memoization' provides a very primitive form of memoization
+*** New macro 'with-memoization' provides a very primitive form of memoization.
 
-** ansi-color.el
+** ansi-color
 
 ---
 *** Support for ANSI 256-color and 24-bit colors.
@@ -130,14 +132,18 @@ filters and displayed with the specified color.
 *** Support for ANSI 256-color and 24-bit colors, italic and other fonts.
 Term-mode can now display 256-color and 24-bit color codes.  It can
 also handle ANSI codes for faint, italic and blinking text, displaying
-it with new 'ansi-term-faint/italic/slow-blinking/fast-blinking'
-faces.
+it with new 'term-{faint,italic,slow-blink,fast-blink}' faces.
 
 ** Xref
 
 *** 'project-find-file' and 'project-or-external-find-file' now accept
 a prefix argument which is interpreted to mean "include all files".
 
+** File notifications
+
++++
+*** The new command 'file-notify-rm-all-watches' removes all file notifications.
+
 
 * New Modes and Packages in Emacs 29.1
 
@@ -183,7 +189,7 @@ If given the new optional KILL-PERMANENT argument, also kill permanent
 local variables.
 
 +++
-** Third 'mapconcat' argument 'separator' is now optional.
+** Third 'mapconcat' argument SEPARATOR is now optional.
 An explicit nil always meant the empty string, now it can be left out.
 
 ---

lisp/filenotify.el

@@ -478,6 +478,14 @@ DESCRIPTOR should be an object returned by `file-notify-add-watch'."
       ;; Modify `file-notify-descriptors' and send a `stopped' event.
       (file-notify--rm-descriptor descriptor))))
 
+(defun file-notify-rm-all-watches ()
+  "Remove all existing file notification watches from Emacs."
+  (interactive)
+  (maphash
+   (lambda (key _value)
+     (file-notify-rm-watch key))
+   file-notify-descriptors))
+
 (defun file-notify-valid-p (descriptor)
   "Check a watch specified by its DESCRIPTOR.
 DESCRIPTOR should be an object returned by `file-notify-add-watch'."

test/lisp/filenotify-tests.el

@@ -162,9 +162,7 @@ Return nil when any other file notification watch is still active."
 
 (defun file-notify--test-cleanup ()
   "Cleanup after a test."
-  (file-notify-rm-watch file-notify--test-desc)
-  (file-notify-rm-watch file-notify--test-desc1)
-  (file-notify-rm-watch file-notify--test-desc2)
+  (file-notify-rm-all-watches)
 
   (ignore-errors
     (delete-file (file-newest-backup file-notify--test-tmpfile)))
@@ -421,7 +419,7 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
 
 ;; This test is inspired by Bug#26126 and Bug#26127.
 (ert-deftest file-notify-test02-rm-watch ()
-  "Check `file-notify-rm-watch'."
+  "Check `file-notify-rm-watch' and `file-notify-rm-all-watches'."
   (skip-unless (file-notify--test-local-enabled))
 
   (unwind-protect
@@ -516,6 +514,31 @@ If UNSTABLE is non-nil, the test is tagged as `:unstable'."
             ;; The environment shall be cleaned up.
             (file-notify--test-cleanup-p))))
 
+    ;; Cleanup.
+    (file-notify--test-cleanup))
+
+  (unwind-protect
+      ;; Check `file-notify-rm-all-watches'.
+      (progn
+        (setq file-notify--test-tmpfile (file-notify--test-make-temp-name)
+              file-notify--test-tmpfile1 (file-notify--test-make-temp-name))
+        (write-region "any text" nil file-notify--test-tmpfile nil 'no-message)
+        (write-region "any text" nil file-notify--test-tmpfile1 nil 'no-message)
+        (should
+         (setq file-notify--test-desc
+               (file-notify-add-watch
+                file-notify--test-tmpfile '(change) #'ignore)))
+        (should
+         (setq file-notify--test-desc1
+               (file-notify-add-watch
+                file-notify--test-tmpfile1 '(change) #'ignore)))
+        (file-notify-rm-all-watches)
+        (delete-file file-notify--test-tmpfile)
+        (delete-file file-notify--test-tmpfile1)
+
+        ;; The environment shall be cleaned up.
+        (file-notify--test-cleanup-p))
+
     ;; Cleanup.
     (file-notify--test-cleanup)))