From 21da2e32cc9e4df8564e5eaafa8498a4e3b1b2bf Mon Sep 17 00:00:00 2001
From: Kyle Meyer <kyle@kyleam.com>
Date: Sun, 10 Jan 2021 19:47:15 -0500
Subject: magit: Add commands to dump diff or patch to a buffer

---
 lisp/km-magit.el | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)

(limited to 'lisp')

diff --git a/lisp/km-magit.el b/lisp/km-magit.el
index 39e3b64..f6f4cdf 100644
--- a/lisp/km-magit.el
+++ b/lisp/km-magit.el
@@ -930,6 +930,51 @@ appending [M/N] to each entry."
       (auto-fill-mode 1)
       (flyspell-mode 1))))
 
+;;;###autoload
+(defun km/magit-dump-diff-to-buffer (&optional arg)
+  "Like `magit-patch-save', but dump output to a buffer."
+  ;; Note: Nearly all of this is just copied from `magit-patch-save'.
+  (interactive "P")
+  (require 'magit-patch)
+  (unless (derived-mode-p 'magit-diff-mode)
+    (user-error "Only diff buffers can be saved as patches"))
+  (let ((rev magit-buffer-range)
+        (typearg magit-buffer-typearg)
+        (args magit-buffer-diff-args)
+        (files magit-buffer-diff-files))
+    (cond ((eq magit-patch-save-arguments 'buffer)
+           (when arg
+             (setq args nil)))
+          ((eq (car-safe magit-patch-save-arguments) 'exclude)
+           (unless arg
+             (setq args (-difference args (cdr magit-patch-save-arguments)))))
+          ((not arg)
+           (setq args magit-patch-save-arguments)))
+    (with-current-buffer
+        (generate-new-buffer
+         (replace-regexp-in-string
+          "^\\*" "*diff dump: "
+          (funcall magit-generate-buffer-name-function
+                   major-mode (magit-buffer-value))))
+      (magit-git-insert "diff" rev "-p" typearg args "--" files)
+      (pop-to-buffer (current-buffer)))))
+
+;;;###autoload
+(defun km/magit-dump-patch-to-buffer ()
+  (interactive)
+  (require 'magit-patch)
+  (unless (derived-mode-p 'magit-revision-mode)
+    (user-error "Not revision buffer"))
+  (let ((rev magit-buffer-revision))
+    (with-current-buffer
+        (generate-new-buffer
+         (replace-regexp-in-string
+          "^\\*" "*patch dump: "
+          (funcall magit-generate-buffer-name-function
+                   major-mode (magit-buffer-value))))
+      (magit-git-insert "format-patch" "--stdout" (concat rev "^-1"))
+      (pop-to-buffer (current-buffer)))))
+
 
 ;;; Copy functions
 
-- 
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