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+;;; evil-jumps.el --- Jump list implementation
+
+;; Author: Bailey Ling <bling at live.ca>
+
+;; Version: 1.2.13
+
+;;
+;; This file is NOT part of GNU Emacs.
+
+;;; License:
+
+;; This file is part of Evil.
+;;
+;; Evil 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.
+;;
+;; Evil 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 Evil.  If not, see <http://www.gnu.org/licenses/>.
+
+(require 'cl-lib)
+(require 'evil-core)
+(require 'evil-states)
+
+;;; Code:
+
+(defgroup evil-jumps nil
+  "Evil jump list configuration options."
+  :prefix "evil-jumps"
+  :group 'evil)
+
+(defcustom evil-jumps-cross-buffers t
+  "When non-nil, the jump commands can cross borders between buffers, otherwise the jump commands act only within the current buffer."
+  :type 'boolean
+  :group 'evil-jumps)
+
+(defcustom evil-jumps-max-length 100
+  "The maximum number of jumps to keep track of."
+  :type 'integer
+  :group 'evil-jumps)
+
+(defcustom evil-jumps-pre-jump-hook nil
+  "Hooks to run just before jumping to a location in the jump list."
+  :type 'hook
+  :group 'evil-jumps)
+
+(defcustom evil-jumps-post-jump-hook nil
+  "Hooks to run just after jumping to a location in the jump list."
+  :type 'hook
+  :group 'evil-jumps)
+
+(defcustom evil-jumps-ignored-file-patterns '("COMMIT_EDITMSG$" "TAGS$")
+  "A list of pattern regexps to match on the file path to exclude from being included in the jump list."
+  :type '(repeat string)
+  :group 'evil-jumps)
+
+;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
+
+(defvar savehist-additional-variables)
+
+(defvar evil--jumps-jumping nil)
+
+(eval-when-compile (defvar evil--jumps-debug nil))
+
+(defvar evil--jumps-buffer-targets "\\*\\(new\\|scratch\\)\\*"
+  "Regexp to match against `buffer-name' to determine whether it's a valid jump target.")
+
+(defvar evil--jumps-window-jumps (make-hash-table)
+  "Hashtable which stores all jumps on a per window basis.")
+
+(defvar evil-jumps-history nil
+  "History of `evil-mode' jumps that are persisted with `savehist'.")
+
+(cl-defstruct evil-jumps-struct
+  ring
+  (idx -1))
+
+(defmacro evil--jumps-message (format &rest args)
+  (when evil--jumps-debug
+    `(with-current-buffer (get-buffer-create "*evil-jumps*")
+       (goto-char (point-max))
+       (insert (apply #'format ,format ',args) "\n"))))
+
+(defun evil--jumps-get-current (&optional window)
+  (unless window
+    (setq window (frame-selected-window)))
+  (let* ((jump-struct (gethash window evil--jumps-window-jumps)))
+    (unless jump-struct
+      (setq jump-struct (make-evil-jumps-struct))
+      (puthash window jump-struct evil--jumps-window-jumps))
+    jump-struct))
+
+(defun evil--jumps-get-jumps (struct)
+  (let ((ring (evil-jumps-struct-ring struct)))
+    (unless ring
+      (setq ring (make-ring evil-jumps-max-length))
+      (setf (evil-jumps-struct-ring struct) ring))
+    ring))
+
+(defun evil--jumps-get-window-jump-list ()
+  (let ((struct (evil--jumps-get-current)))
+    (evil--jumps-get-jumps struct)))
+
+(defun evil--jumps-savehist-load ()
+  (add-to-list 'savehist-additional-variables 'evil-jumps-history)
+  (let ((ring (make-ring evil-jumps-max-length)))
+    (cl-loop for jump in (reverse evil-jumps-history)
+             do (ring-insert ring jump))
+    (setf (evil-jumps-struct-ring (evil--jumps-get-current)) ring))
+  (add-hook 'savehist-save-hook #'evil--jumps-savehist-sync)
+  (remove-hook 'savehist-mode-hook #'evil--jumps-savehist-load))
+
+(defun evil--jumps-savehist-sync ()
+  "Updates the printable value of window jumps for `savehist'."
+  (setq evil-jumps-history
+        (cl-remove-if-not #'identity
+                          (mapcar #'(lambda (jump)
+                                      (let* ((mark (car jump))
+                                             (pos (if (markerp mark)
+                                                      (marker-position mark)
+                                                    mark))
+                                             (file-name (cadr jump)))
+                                        (if (and (not (file-remote-p file-name))
+                                                 (file-exists-p file-name)
+                                                 pos)
+                                            (list pos file-name)
+                                          nil)))
+                                  (ring-elements (evil--jumps-get-window-jump-list))))))
+
+(defun evil--jumps-jump (idx shift)
+  (let ((target-list (evil--jumps-get-window-jump-list)))
+    (evil--jumps-message "jumping from %s by %s" idx shift)
+    (evil--jumps-message "target list = %s" target-list)
+    (setq idx (+ idx shift))
+    (let* ((current-file-name (or (buffer-file-name) (buffer-name)))
+           (size (ring-length target-list)))
+      (unless evil-jumps-cross-buffers
+        ;; skip jump marks pointing to other buffers
+        (while (and (< idx size) (>= idx 0)
+                    (not (string= current-file-name
+                                  (let* ((place (ring-ref target-list idx))
+                                         (pos (car place)))
+                                    (cadr place)))))
+          (setq idx (+ idx shift))))
+      (when (and (< idx size) (>= idx 0))
+        ;; actual jump
+        (run-hooks 'evil-jumps-pre-jump-hook)
+        (let* ((place (ring-ref target-list idx))
+               (pos (car place))
+               (file-name (cadr place)))
+          (setq evil--jumps-jumping t)
+          (if (string-match-p evil--jumps-buffer-targets file-name)
+              (switch-to-buffer file-name)
+            (find-file file-name))
+          (setq evil--jumps-jumping nil)
+          (goto-char pos)
+          (setf (evil-jumps-struct-idx (evil--jumps-get-current)) idx)
+          (run-hooks 'evil-jumps-post-jump-hook))))))
+
+(defun evil--jumps-push ()
+  "Pushes the current cursor/file position to the jump list."
+  (let ((target-list (evil--jumps-get-window-jump-list)))
+    (let ((file-name (buffer-file-name))
+          (buffer-name (buffer-name))
+          (current-pos (point-marker))
+          (first-pos nil)
+          (first-file-name nil)
+          (excluded nil))
+      (when (and (not file-name)
+                 (string-match-p evil--jumps-buffer-targets buffer-name))
+        (setq file-name buffer-name))
+      (when file-name
+        (dolist (pattern evil-jumps-ignored-file-patterns)
+          (when (string-match-p pattern file-name)
+            (setq excluded t)))
+        (unless excluded
+          (unless (ring-empty-p target-list)
+            (setq first-pos (car (ring-ref target-list 0)))
+            (setq first-file-name (car (cdr (ring-ref target-list 0)))))
+          (unless (and (equal first-pos current-pos)
+                       (equal first-file-name file-name))
+            (evil--jumps-message "pushing %s on %s" current-pos file-name)
+            (ring-insert target-list `(,current-pos ,file-name))))))
+    (evil--jumps-message "%s %s"
+                         (selected-window)
+                         (and (not (ring-empty-p target-list))
+                              (ring-ref target-list 0)))))
+
+(evil-define-command evil-show-jumps ()
+  "Display the contents of the jump list."
+  :repeat nil
+  (evil-with-view-list
+    :name "evil-jumps"
+    :mode "Evil Jump List"
+    :format [("Jump" 5 nil)
+             ("Marker" 8 nil)
+             ("File/text" 1000 t)]
+    :entries (let* ((jumps (evil--jumps-savehist-sync))
+                    (count 0))
+               (cl-loop for jump in jumps
+                        collect `(nil [,(number-to-string (cl-incf count))
+                                       ,(number-to-string (car jump))
+                                       (,(cadr jump))])))
+    :select-action #'evil--show-jumps-select-action))
+
+(defun evil--show-jumps-select-action (jump)
+  (let ((position (string-to-number (elt jump 1)))
+        (file (car (elt jump 2))))
+    (kill-buffer)
+    (switch-to-buffer (find-file file))
+    (goto-char position)))
+
+(defun evil-set-jump (&optional pos)
+  "Set jump point at POS.
+POS defaults to point."
+  (unless (or (region-active-p) (evil-visual-state-p))
+    (push-mark pos t))
+
+  (unless evil--jumps-jumping
+    ;; clear out intermediary jumps when a new one is set
+    (let* ((struct (evil--jumps-get-current))
+           (target-list (evil--jumps-get-jumps struct))
+           (idx (evil-jumps-struct-idx struct)))
+      (cl-loop repeat idx
+               do (ring-remove target-list))
+      (setf (evil-jumps-struct-idx struct) -1))
+    (save-excursion
+      (when pos
+        (goto-char pos))
+      (evil--jumps-push))))
+
+(defun evil--jump-backward (count)
+  (let ((count (or count 1)))
+    (evil-motion-loop (nil count)
+      (let* ((struct (evil--jumps-get-current))
+             (idx (evil-jumps-struct-idx struct)))
+        (evil--jumps-message "jumping back %s" idx)
+        (when (= idx -1)
+          (setq idx 0)
+          (setf (evil-jumps-struct-idx struct) 0)
+          (evil--jumps-push))
+        (evil--jumps-jump idx 1)))))
+
+(defun evil--jump-forward (count)
+  (let ((count (or count 1)))
+    (evil-motion-loop (nil count)
+      (let* ((struct (evil--jumps-get-current))
+             (idx (evil-jumps-struct-idx struct)))
+        (when (= idx -1)
+          (setq idx 0)
+          (setf (evil-jumps-struct-idx struct) 0)
+          (evil--jumps-push))
+          (evil--jumps-jump idx -1)))))
+
+(defun evil--jumps-window-configuration-hook (&rest args)
+  (let* ((window-list (window-list-1 nil nil t))
+         (existing-window (selected-window))
+         (new-window (previous-window)))
+    (when (and (not (eq existing-window new-window))
+               (> (length window-list) 1))
+      (let* ((target-jump-struct (evil--jumps-get-current new-window))
+             (target-jump-count (ring-length (evil--jumps-get-jumps target-jump-struct))))
+        (if (not (ring-empty-p (evil--jumps-get-jumps target-jump-struct)))
+            (evil--jumps-message "target window %s already has %s jumps" new-window target-jump-count)
+          (evil--jumps-message "new target window detected; copying %s to %s" existing-window new-window)
+          (let* ((source-jump-struct (evil--jumps-get-current existing-window))
+                 (source-list (evil--jumps-get-jumps source-jump-struct)))
+            (when (= (ring-length (evil--jumps-get-jumps target-jump-struct)) 0)
+              (setf (evil-jumps-struct-idx target-jump-struct) (evil-jumps-struct-idx source-jump-struct))
+              (setf (evil-jumps-struct-ring target-jump-struct) (ring-copy source-list)))))))
+    ;; delete obsolete windows
+    (maphash (lambda (key val)
+               (unless (member key window-list)
+                 (evil--jumps-message "removing %s" key)
+                 (remhash key evil--jumps-window-jumps)))
+             evil--jumps-window-jumps)))
+
+(defun evil--jump-hook (&optional command)
+  "Set jump point if COMMAND has a non-nil :jump property."
+  (setq command (or command this-command))
+  (when (evil-get-command-property command :jump)
+    (evil-set-jump)))
+
+(defadvice switch-to-buffer (before evil-jumps activate)
+  (evil-set-jump))
+
+(defadvice split-window-internal (before evil-jumps activate)
+  (evil-set-jump))
+
+(eval-after-load 'etags
+  '(defadvice find-tag-noselect (before evil-jumps activate)
+     (evil-set-jump)))
+
+(if (bound-and-true-p savehist-loaded)
+    (evil--jumps-savehist-load)
+  (add-hook 'savehist-mode-hook #'evil--jumps-savehist-load))
+
+(add-hook 'evil-local-mode-hook
+          (lambda ()
+            (if evil-local-mode
+                (progn
+                  (add-hook 'pre-command-hook #'evil--jump-hook nil t)
+                  (add-hook 'next-error-hook #'evil-set-jump nil t)
+                  (add-hook 'window-configuration-change-hook #'evil--jumps-window-configuration-hook nil t))
+              (progn
+                (remove-hook 'pre-command-hook #'evil--jump-hook t)
+                (remove-hook 'next-error-hook #'evil-set-jump t)
+                (remove-hook 'window-configuration-change-hook #'evil--jumps-window-configuration-hook t)))))
+
+(provide 'evil-jumps)
+
+;;; evil-jumps.el ends here