[nongnu] elpa/undo-fu dbb3e4b699: Add action to clear all undo history

[ELPA Syncer]

branch: elpa/undo-fu
commit dbb3e4b699dd488497ef9b32a04b8e928a6bc8ef
Author: Campbell Barton <ideasman42@gmail.com>
Commit: Campbell Barton <ideasman42@gmail.com>

    Add action to clear all undo history
    
    Addresses #19.
---
 changelog.rst |  3 +++
 readme.rst    |  1 +
 undo-fu.el    | 12 ++++++++++++
 3 files changed, 16 insertions(+)

diff --git a/changelog.rst b/changelog.rst
index ae7c0ca86d..31ac4458a9 100644
--- a/changelog.rst
+++ b/changelog.rst
@@ -3,6 +3,9 @@
 Change Log
 ##########
 
+- In development.
+  - Add ``undo-fu-clear-all`` to delete all undo history.
+
 - Version 0.5 (2022-07-10)
   - Fix unconstrained undo when the user has ``undo-no-redo`` enabled.
   - Protect against ``aggressive-indent-mode``.
diff --git a/readme.rst b/readme.rst
index 57eaf0fc1b..473af8f234 100644
--- a/readme.rst
+++ b/readme.rst
@@ -40,6 +40,7 @@ This package exposes the following functions:
 - ``undo-fu-only-redo``
 - ``undo-fu-only-redo-all``
 - ``undo-fu-disable-checkpoint`` (only needed when 
``undo-fu-ignore-keyboard-quit`` is in use).
+- ``undo-fu-clear-all`` clear all undo/redo history.
 
 
 Key Bindings
diff --git a/undo-fu.el b/undo-fu.el
index b6dd528fbd..0afe83a078 100644
--- a/undo-fu.el
+++ b/undo-fu.el
@@ -428,6 +428,18 @@ Optional argument ARG the number of steps to undo."
       (setq this-command 'undo-fu-only-undo)
       success)))
 
+;; ---------------------------------------------------------------------------
+;; Public Functions (Extra Utilities)
+
+;;;###autoload
+(defun undo-fu-clear-all ()
+  "Clear all undo/redo steps."
+  (interactive)
+  (setq buffer-undo-list nil)
+  (setq pending-undo-list nil)
+  (clrhash undo-equiv-table))
+
+
 ;; Evil Mode (setup if in use)
 ;;
 ;; Don't let these commands repeat.