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[nongnu] elpa/scroll-on-jump 30e23e8694 01/31: Initial commit


From: ELPA Syncer
Subject: [nongnu] elpa/scroll-on-jump 30e23e8694 01/31: Initial commit
Date: Thu, 7 Jul 2022 12:03:11 -0400 (EDT)

branch: elpa/scroll-on-jump
commit 30e23e86949b1bd53906d3f9036dfb57213e336c
Author: Campbell Barton <ideasman42@gmail.com>
Commit: Campbell Barton <ideasman42@gmail.com>

    Initial commit
---
 .elisp-autofmt    |   0
 LICENSE           | 674 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 readme.rst        | 147 ++++++++++++
 scroll-on-jump.el | 443 +++++++++++++++++++++++++++++++++++
 4 files changed, 1264 insertions(+)

diff --git a/.elisp-autofmt b/.elisp-autofmt
new file mode 100644
index 0000000000..e69de29bb2
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000000..f288702d2f
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,674 @@
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+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.
diff --git a/readme.rst b/readme.rst
new file mode 100644
index 0000000000..037c209b41
--- /dev/null
+++ b/readme.rst
@@ -0,0 +1,147 @@
+
+##############
+Scroll on Jump
+##############
+
+This package allows you to control the scrolling on any operation that jumps 
to a new location.
+
+- Re-centers vertical scrolling.
+- Optionally animate the scroll using a fixed time limit.
+
+Since this might not always be desired, this can be applied using advice or 
individual key bindings,
+if you prefer to limit the changes to certain shortcuts.
+
+.. Available via `melpa <https://melpa.org>`__.
+
+Motivation
+==========
+
+Actions that move the point may move the cursor to the edge of the screen,
+while having a large scroll-margin can help, this isn't always convenient
+as it can be useful to move the cursor to the screen edge.
+
+
+Features
+========
+
+Animated Scrolling
+   You can optionally jump to the new location in multiple steps (lines/pixels)
+   this can help to give context when moving around the document.
+Responsive Animation
+   To avoid animation display slowing you down - any input will cancel the 
animation
+   so multiple key strokes won't lag behind display updates.
+Un-intrusive
+   This only exposes functionality you can make use of,
+   without interfering with anything you don't want it to.
+
+
+Usage
+=====
+
+The following functions are exposed.
+
+``scroll-on-jump``
+   Macro that behaves like ``progn``,
+   any code that runs in the body of this macro will perform scrolling when 
moving the point.
+``scroll-on-jump-interactive``
+   Use this to wrap interactive function (intended to be used in key bindings).
+``scroll-on-jump-advice-add``
+   Adds advice so scrolling is performed whenever the function is called.
+``scroll-on-jump-advice-remove``
+   Remove the advice added to the function.
+
+
+Commands that work well include:
+
+- Jump to search result, paragraph, function ... etc.
+- Undo/redo.
+- Go to declaration.
+
+
+Key Binding Example
+-------------------
+
+Take this example of pressing ``Ctrl-Z`` for undo.
+
+Using ``scroll-on-jump-interactive`` makes this use ``scrol-on-jump`` features.
+
+Before:
+
+.. code-block:: elisp
+
+   (global-set-key (kbd "<C-z>") 'undo)
+
+After:
+
+.. code-block:: elisp
+
+   (global-set-key (kbd "<C-z>") (scroll-on-jump-interactive 'undo))
+
+
+Advice Example
+--------------
+
+Use this with care, since it advises all uses of the function.
+
+.. code-block:: elisp
+
+   (scroll-on-jump-advice-add forward-paragraph)
+   (scroll-on-jump-advice-add backward-paragraph)
+
+
+Macro Example
+-------------
+
+When already using a ``lambda`` in a key-binding, it's simplest to wrap this 
in a macro.
+
+
+Before:
+
+.. code-block:: elisp
+
+   (global-set-key (kbd "<f12>")
+     (lambda () (interactive) (my-function)))
+
+After:
+
+.. code-block:: elisp
+
+   (global-set-key (kbd "<f12>")
+     (lambda () (interactive) (scroll-on-jump (my-function))))
+
+Customization
+=============
+
+While the defaults seem to work well, these values can be customized.
+
+``scroll-on-jump-duration``: 0.4
+   The duration for jumping to take, set to ``0.0`` to jump immediately.
+``scroll-on-jump-smooth``: t
+   When not nil, use smooth scrolling (by pixels).
+``scroll-on-jump-use-curve``
+   Apply a curve to the scroll speed, starting and ending slow.
+
+
+Installation
+============
+
+Until this is available on melpa, straight can be used to install this package.
+
+.. code-block:: elisp
+
+   (use-package scroll-on-jump
+     :config
+     (setq scroll-on-jump-duration 0.6)
+
+     :straight
+     (scroll-on-jump
+       :type git
+       :host gitlab
+       :repo "ideasman42/emacs-scroll-on-jump"))
+
+
+Limitations
+===========
+
+- Any commands that themselves scroll to a new location will not work as 
expected
+  (they may scroll too far for example).
diff --git a/scroll-on-jump.el b/scroll-on-jump.el
new file mode 100644
index 0000000000..1913d62af6
--- /dev/null
+++ b/scroll-on-jump.el
@@ -0,0 +1,443 @@
+;;; scroll-on-jump.el --- Scroll when jumping to a new point -*- 
lexical-binding: t -*-
+
+;; Copyright (C) 2020  Campbell Barton
+
+;; Author: Campbell Barton <ideasman42@gmail.com>
+
+;; URL: https://gitlab.com/ideasman42/emacs-scroll-on-jump
+;; Version: 0.1
+;; Package-Requires: ((emacs "26.2"))
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Lets users call any existing function that jumps to another point,
+;; adding additional (optional) scrolling functionality.
+;;
+;; - Re-center after the jump.
+;; - Animate the scroll-motion by redrawing.
+
+;;; Usage
+
+;; See readme.rst.
+;;
+
+;;; Code:
+
+
+;; ---------------------------------------------------------------------------
+;; Custom Variables
+
+(defcustom scroll-on-jump-duration 0.4
+  "The time in allowed (in seconds) for scrolling to the next position (zero 
disables)."
+  :group 'scroll-on-jump
+  :type 'integer)
+
+(defcustom scroll-on-jump-smooth t
+  "Use smooth (pixel) scrolling, otherwise scroll by lines."
+  :group 'scroll-on-jump
+  :type 'boolean)
+
+(defcustom scroll-on-jump-use-curve t
+  "Apply a curve to the scroll speed, starting and ending slow."
+  :group 'scroll-on-jump
+  :type 'boolean)
+
+
+;; ---------------------------------------------------------------------------
+;; Generic Utilities
+
+(defun scroll-on-jump--scroll-by-lines-simple (window lines also-move-point)
+  "A simple version of `scroll-on-jump--scroll-by-lines'.
+
+Move LINES in WINDOW, when ALSO-MOVE-POINT is set, the point is moved too."
+  (when also-move-point
+    (forward-line lines))
+  (set-window-start
+    window
+    (save-excursion
+      (goto-char (window-start window))
+      (forward-line lines)
+      (point))
+    t))
+
+;; Per-line Scroll.
+;; return remainder of lines to scroll (matching forward-line).
+(defun scroll-on-jump--scroll-by-lines (window lines also-move-point)
+  "Line based scroll that optionally move the point.
+Argument WINDOW The window to scroll.
+Argument LINES The number of lines to scroll (signed).
+Argument ALSO-MOVE-POINT When non-nil, move the POINT as well."
+  (let ((lines-remainder 0))
+    (when also-move-point
+      (let ((lines-point-remainder (forward-line lines)))
+        (unless (zerop lines-point-remainder)
+          (setq lines (- lines lines-point-remainder)))))
+    (unless (zerop lines)
+      (set-window-start
+        window
+        (save-excursion
+          (goto-char (window-start window))
+          (setq lines-remainder (forward-line lines))
+          (point))
+        t)
+      (when also-move-point
+        (unless (zerop lines-remainder)
+          (forward-line (- lines-remainder)))))
+    lines-remainder))
+
+
+;; Per-pixel Scroll,
+;; return remainder of lines to scroll (matching forward-line).
+(defun scroll-on-jump--scroll-by-pixels (window char-height delta-px 
also-move-point)
+  "Line based scroll that optionally move the point.
+Argument WINDOW The window to scroll.
+Argument CHAR-HEIGHT The result of `frame-char-height'.
+Argument DELTA-PX The number of pixels to scroll (signed).
+Argument ALSO-MOVE-POINT When non-nil, move the POINT as well."
+  (cond
+    ((< delta-px 0)
+      (let*
+        (
+          (scroll-px-prev (- char-height (window-vscroll nil t))) ;; flip.
+          (scroll-px-next (+ scroll-px-prev (- delta-px))) ;; flip.
+          (lines (/ scroll-px-next char-height))
+          (scroll-px (- scroll-px-next (* lines char-height)))
+          (lines-remainder 0))
+        (unless (zerop lines)
+          ;; flip
+          (setq lines-remainder
+            (- (scroll-on-jump--scroll-by-lines window (- lines) 
also-move-point)))
+          (unless (zerop lines-remainder)
+            (setq scroll-px char-height)))
+        (set-window-vscroll window (- char-height scroll-px) t)
+
+        (cons (- lines-remainder) (- lines))))
+    ((> delta-px 0)
+      (let*
+        (
+          (scroll-px-prev (window-vscroll nil t))
+          (scroll-px-next (+ scroll-px-prev delta-px))
+          (lines (/ scroll-px-next char-height))
+          (scroll-px (- scroll-px-next (* lines char-height)))
+          (lines-remainder 0))
+        (unless (zerop lines)
+          (setq lines-remainder (scroll-on-jump--scroll-by-lines window lines 
also-move-point))
+          (unless (zerop lines-remainder)
+            (setq scroll-px char-height)))
+        (set-window-vscroll window scroll-px t)
+        (cons lines-remainder lines)))
+    ;; no lines scrolled.
+    (t
+      (cons 0 0))))
+
+(defun scroll-on-jump--interpolate-ease (a b factor)
+  "Blend FACTOR between A and B using ease style curvature."
+  (+ a (* (- b a) (- (* 3.0 factor factor) (* 2.0 factor factor factor)))))
+
+
+;; ---------------------------------------------------------------------------
+;; Internal Logic
+
+
+(defun scroll-on-jump--immediate-scroll (window lines-scroll _dir)
+  "Non animated scroll for WINDOW to move LINES-SCROLL."
+  (scroll-on-jump--scroll-by-lines-simple window lines-scroll nil))
+
+(defun scroll-on-jump--animated-scroll-by-line (window lines-scroll dir)
+  "Animated scroll WINDOW LINES-SCROLL lines along DIR direction."
+  (let
+    (
+      (time-init (current-time))
+      ;; For motion less than a window, scale down the time allowed.
+      ;; This means moving a short distance wont be given the full time.
+      (time-limit
+        (*
+          scroll-on-jump-duration
+          (min 1.0 (/ (float (abs lines-scroll)) (float (window-height 
window))))))
+      (use-curve scroll-on-jump-use-curve))
+
+    ;; Animated scrolling (early exit on input to avoid annoying lag).
+    (if (not (zerop lines-scroll))
+      (let
+        (
+          (is-early-exit t)
+          (inhibit-point-motion-hooks t)
+          (lines-done-abs 0)
+          (lines-scroll-abs (abs lines-scroll)))
+        (while-no-input
+          (while (< lines-done-abs lines-scroll-abs)
+            ;; Inhibit quit in all of this logic except re-display.
+            (let
+              (
+                (inhibit-quit t)
+                ;; Number of lines to move for this redraw.
+                (step
+                  (let*
+                    (
+                      (time-elapsed (float-time (time-subtract (current-time) 
time-init)))
+                      (factor (min 1.0 (/ time-elapsed time-limit)))
+                      (lines-target
+                        (floor
+                          (cond
+                            (use-curve
+                              (scroll-on-jump--interpolate-ease 0.0 
lines-scroll-abs factor))
+                            (t
+                              (* lines-scroll-abs factor)))))
+                      (lines-remainder (- lines-target lines-done-abs)))
+                    ;; Step result, we must move at least one line.
+                    (* dir (max 1 lines-remainder)))))
+
+              ;; Check if this is the last step.
+              (setq lines-done-abs (+ lines-done-abs (abs step)))
+              (when (> lines-done-abs lines-scroll-abs)
+                (setq step (- step (* dir (- lines-done-abs 
lines-scroll-abs)))))
+
+              ;; Faster alternative to scroll.
+              (scroll-on-jump--scroll-by-lines-simple window step t)
+
+              (setq lines-scroll (- lines-scroll step)))
+
+            ;; Force `redisplay', without this redrawing can be a little 
choppy.
+            (redisplay t))
+          (setq is-early-exit nil))
+
+        ;; ;; Re-enable when editing logic.
+        (when (and (null is-early-exit) (not (zerop lines-scroll)))
+          (error "Internal error, 'lines-scroll' should be zero"))
+
+        ;; If we exit early because of input.
+        (when is-early-exit
+          (scroll-on-jump--scroll-by-lines-simple window lines-scroll nil)))
+
+      ;; Non-animated scrolling (immediate).
+      (scroll-on-jump--scroll-by-lines-simple window lines-scroll nil)))
+
+  (run-window-scroll-functions window))
+
+(defun scroll-on-jump--animated-scroll-by-px (window lines-scroll dir)
+  "Animated scroll WINDOW LINES-SCROLL lines along DIR direction."
+  (let
+    (
+      (time-init (current-time))
+      ;; For motion less than a window, scale down the time allowed.
+      ;; This means moving a short distance wont be given the full time.
+      (time-limit
+        (*
+          scroll-on-jump-duration
+          (min 1.0 (/ (float (abs lines-scroll)) (float (window-height 
window))))))
+      (use-curve scroll-on-jump-use-curve)
+      (char-height (frame-char-height (window-frame window))))
+
+    ;; Animated scrolling (early exit on input to avoid annoying lag).
+    (if (not (zerop lines-scroll))
+      (let
+        (
+          (is-early-exit t)
+          (inhibit-point-motion-hooks t)
+          (px-done-abs 0)
+          (px-scroll-abs (abs (* lines-scroll char-height)))
+          (px-scroll (* lines-scroll char-height)))
+        (while-no-input
+          (while (< px-done-abs px-scroll-abs)
+            ;; Inhibit quit in all of this logic except re-display.
+            (let
+              (
+                (inhibit-quit t)
+                ;; Number of pixels to move for this redraw.
+                (step
+                  (let*
+                    (
+                      (time-elapsed (float-time (time-subtract (current-time) 
time-init)))
+                      (factor (min 1.0 (/ time-elapsed time-limit)))
+                      (px-target
+                        (floor
+                          (cond
+                            (use-curve
+                              (scroll-on-jump--interpolate-ease 0.0 
px-scroll-abs factor))
+                            (t
+                              (* px-scroll-abs factor)))))
+                      (px-remainder (- px-target px-done-abs)))
+                    ;; Step result, we must move at least one pixel.
+                    (* dir (max 1 (floor px-remainder))))))
+
+              ;; Check if this is the last step.
+              (setq px-done-abs (+ px-done-abs (abs step)))
+              (when (> px-done-abs px-scroll-abs)
+                (setq step (- step (* dir (- px-done-abs px-scroll-abs)))))
+
+              (pcase-let
+                (
+                  (`(,_lines-remainder . ,lines-handled)
+                    (scroll-on-jump--scroll-by-pixels window char-height step 
t)))
+                (setq lines-scroll (- lines-scroll lines-handled)))
+
+              (setq px-scroll (- px-scroll step)))
+
+            ;; Force `redisplay', without this redrawing can be a little 
choppy.
+            (redisplay t))
+          (setq is-early-exit nil))
+
+        ;; ;; Re-enable when editing logic.
+        (when (and (null is-early-exit) (not (zerop px-scroll)))
+          (set-window-vscroll window 0 t)
+          (error "Internal error, 'px-scroll' should be zero"))
+
+        ;; If we exit early because of input.
+        (when is-early-exit
+          (set-window-vscroll window 0 t)
+          (scroll-on-jump--scroll-by-lines-simple window lines-scroll nil)))
+
+      ;; Non-animated scrolling (immediate).
+      (scroll-on-jump--scroll-by-lines-simple window lines-scroll nil)))
+
+  (run-window-scroll-functions window))
+
+
+(defun scroll-on-jump-auto-center (window point-prev point-next)
+  "Re-frame WINDOW from POINT-PREV to POINT-NEXT, optionally animating."
+  ;; Count lines, excluding the current line.
+
+  (let ((lines (1- (count-screen-lines point-prev point-next t))))
+    (when (> lines 0)
+      (let
+        (
+          (height (window-height window))
+          (lines-scroll 0)
+          (dir
+            (if (< point-prev point-next)
+              1
+              -1)))
+
+        (if (eq dir 1)
+          (let*
+            (
+              (window-lines-prev (count-screen-lines (window-start window) 
point-prev t))
+              (window-lines-next (+ window-lines-prev lines))
+              (lines-limit (max (/ height 2) window-lines-prev)))
+            (when (>= window-lines-next lines-limit)
+              (setq lines-scroll (- window-lines-next lines-limit))
+              ;; Clamp lines-scroll by the window end
+              ;; Only needed when scrolling down.
+              ;;
+              ;; Do this so we don't scroll past the end.
+              (setq lines-scroll
+                (-
+                  lines-scroll
+                  (save-excursion
+                    (goto-char (window-end))
+                    (forward-line lines-scroll))))))
+          (let*
+            ( ;; Note that we can't use `window-end' here as we may
+              ;; be scrolled past the screen end-point.
+              (window-lines-prev
+                (- height (count-screen-lines (window-start window) point-prev 
t)))
+              (window-lines-next (+ window-lines-prev lines))
+              (lines-limit (max (/ height 2) window-lines-prev)))
+            (when (>= window-lines-next lines-limit)
+              (setq lines-scroll (- lines-limit window-lines-next))
+              ;; Clamp lines-scroll by the window start
+              ;; Only needed when scrolling up.
+              ;;
+              ;; Even though scroll can't scroll past the start,
+              ;; we don't want to try to animate scrolling up in this case.
+              (setq lines-scroll
+                (-
+                  lines-scroll
+                  (save-excursion
+                    (goto-char (window-start window))
+                    (forward-line lines-scroll)))))))
+
+        (cond
+          ;; No animation.
+          ((zerop scroll-on-jump-duration)
+            (scroll-on-jump--immediate-scroll window lines-scroll dir))
+          ;; Use pixel scrolling.
+          ((and scroll-on-jump-smooth (display-graphic-p))
+            (scroll-on-jump--animated-scroll-by-px window lines-scroll dir))
+          ;; Use line scrolling.
+          (t
+            (scroll-on-jump--animated-scroll-by-line window lines-scroll 
dir))))))
+
+  (goto-char point-next))
+
+;; ---------------------------------------------------------------------------
+;; Public Functions
+
+;;;###autoload
+(defmacro scroll-on-jump (&rest body)
+  "Main macro that wraps BODY in logic that reacts to change in `point'."
+  `
+  (let*
+    ( ;; Set in case we have an error.
+      (err-value nil)
+      (buf (current-buffer))
+      (window (selected-window))
+
+      (point-prev (point))
+      (point-next nil)
+
+      (has-context-changed t))
+
+    (prog1
+      (save-excursion
+        (condition-case err
+          (progn
+            ,@body)
+          ;; Re-raise below, after handing cursor motion.
+          (error (setq err-value err)))
+        (setq point-next (point)))
+
+      (when (and (eq buf (current-buffer)) (eq window (selected-window)))
+        (setq has-context-changed nil))
+
+      (cond
+        (has-context-changed
+          ;; Context changed, use a fallback.
+          (goto-char (point)))
+        (t
+          ;; Calculate the new window start.
+          (scroll-on-jump-auto-center window point-prev point-next)))
+
+      (when err-value
+        ;; Re-raise the error.
+        (signal (car err-value) (cdr err-value))))))
+
+;;;###autoload
+(defmacro scroll-on-jump-interactive (fn)
+  "Macro that wraps interactive call to function FN.
+
+Use if you want to use `scroll-on-jump' for a single `key-binding',
+without changing behavior anywhere else."
+  `(lambda () (interactive) (scroll-on-jump (call-interactively ,fn))))
+
+;; Helper function (not public).
+(defun scroll-on-jump-advice--wrapper (old-fn &rest args)
+  "Internal function use to advise using `scroll-on-jump-advice-add' (calling 
OLD-FN with ARGS)."
+  (scroll-on-jump (apply old-fn args)))
+
+;;;###autoload
+(defmacro scroll-on-jump-advice-add (fn)
+  "Add advice to FN, to instrument it with scrolling capabilities."
+  (advice-add fn :around #'scroll-on-jump-advice--wrapper))
+
+;;;###autoload
+(defmacro scroll-on-jump-advice-remove (fn)
+  "Remove advice on FN added by `scroll-on-jump-advice-add'."
+  (advice-remove fn #'scroll-on-jump-advice--wrapper))
+
+(provide 'scroll-on-jump)
+
+;;; scroll-on-jump.el ends here



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