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go-back.el
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;; go-back.el -- just brings you back to where you were before
;; Copyright (C) 2012 Andreas Raster <[email protected]>
;; 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 <http://www.gnu.org/licenses/>.
;; loosely based on and inspired by point-stack.el by
;; matt harrison <[email protected]>
;; dmitry gutov <[email protected]>
;; what I want
;; 1. remember the last position where I made something meaningful [eval-region, save-buffer, ...]
;; 2. restore that position while remembering the position I am currently at
;; 3. scroll through remembered positions until I find the one I want to do something at,
;; then that one should be the one I go back to first after the next time I restored a
;; position
;;
;; lets try that again:
;; I want to remember TWO positions, the one I am working at RIGHT NOW, and the one I where
;; I was working at BEFORE
;; the only way to implement that is to assume that when I restore a position, that I want to
;; work there and therefore remember that position IN ADDITION to the position where I was
;; before restoring
;;
;; do4: 1 2 3 4
;; *
;; f11: 1 2 3 4
;; *<
;; f11: 1 2 3 4
;; *<
;; do : 4 3 2 1
;; *
;; do : 4 3 2 5 1
;; +*
;; do : 4 3 2 5 6 1
;; +*
(require 'cl-lib)
(defvar go-back-past '())
(make-variable-buffer-local 'go-back-past)
(defvar go-back-future '())
(make-variable-buffer-local 'go-back-future)
(defvar go-back-current nil)
(make-variable-buffer-local 'go-back-current)
(defvar go-back-before '(nil (point-min) (point-min)))
(make-variable-buffer-local 'go-back-before)
(defun go-back-reset ()
(interactive)
(setq go-back-past '()
go-back-future '()
go-back-current nil
go-back-before nil))
(defvar go-back-history '())
(make-variable-buffer-local 'go-back-history)
(defvar go-back-last-jump-cost 0)
(make-variable-buffer-local 'go-back-last-jump-cost)
(defun go-back-ignore-word-p (w &optional min-length)
(and (< (length (substring-no-properties w)) (or min-length 2))
(< (let ((hs (make-hash-table)))
(mapc (lambda (c) (puthash c 'found hs)) w)
(hash-table-count hs)) 3)))
(defun go-back-ignore-line-p (&optional min-length)
(save-excursion
(beginning-of-line)
(or (looking-at "^\\s-*$")
(= (length (cl-remove-if (lambda (w) (go-back-ignore-word-p w min-length))
(split-string (buffer-substring-no-properties (point-at-bol) (point-at-eol)) " " t))) 0))))
(defun go-back-previous-line ()
(interactive)
(unless (save-excursion (beginning-of-line) (bobp))
(forward-line -1)
(let ((direction 'up))
(while (go-back-ignore-line-p)
(when (save-excursion
(beginning-of-line)
(bobp))
(setq direction 'down))
(if (eq direction 'up)
(forward-line -1)
(forward-line))
))))
(defun go-back-next-line ()
(interactive)
(unless (save-excursion (end-of-line) (eobp))
(forward-line)
(let ((direction 'down))
(while (go-back-ignore-line-p)
(when (save-excursion
(end-of-line)
(eobp))
(setq direction 'up))
(if (eq direction 'down)
(forward-line)
(forward-line -1))
))))
(defun go-back-go (loc)
(cl-flet ((line-to-re (line)
(when line
(let ((words (cl-remove-if 'go-back-ignore-word-p
(split-string line " " t)))
(res '()))
(while words
(cond ((eq (length words) 1)
(add-to-list 'res (regexp-quote (pop words)) t))
((null res)
(add-to-list 'res (regexp-quote (concat (pop words) " ")) t))
((null (cdr words))
(add-to-list 'res (regexp-quote (concat " " (pop words))) t))
(t
(add-to-list 'res (regexp-quote (concat " " (pop words) " ")) t))))
res))))
(let* ((buffer (nth 0 loc))
(p (eval (nth 1 loc)))
(line-left (nth 3 loc))
(line-right (nth 4 loc))
(re-left (when line-left (regexp-quote line-left)))
(re-right (when line-right (regexp-quote line-right)))
(line-prev (nth 5 loc))
(line-next (nth 6 loc))
(words-1 (line-to-re (concat line-left line-right)))
(words-2 (line-to-re line-prev))
(words-3 (line-to-re line-next))
(final-point nil))
(when loc
(switch-to-buffer (or buffer (other-buffer)))
;; goto original point and try to match line to either left or right regex
(unless final-point
(setq final-point
(save-excursion
(goto-char p)
(cond ((re-search-forward re-right (point-at-eol) t)
(re-search-backward re-right (point-at-bol) t)
(point))
((re-search-backward re-left (point-at-bol) t)
(re-search-forward re-left (point-at-eol) t)
(point)))))))
;; find every line with a matching word, normalize, use line with most matches
(unless final-point
(setq final-point
(save-excursion
(let ((matches-1 (save-excursion
(cl-remove-duplicates
(cl-loop for w1 in words-1
if (string-equal w1 "#bobp#")
collect '(0)
else
if (string-equal w1 "#eobp#")
collect `(,(point-max))
else
if (string-match ".*[a-zA-Z0-9]+.*" w1)
do (goto-char (point-min))
and
collect (cl-loop while (re-search-forward w1 nil t)
collect (point-at-bol))))))
(matches-2 (save-excursion
(cl-remove-duplicates
(cl-loop for w2 in words-2
if (string-equal w2 "#bobp#")
collect '(0)
else
if (string-equal w2 "#eobp#")
collect `(,(point-max))
else
if (string-match ".*[a-zA-Z0-9]+.*" w2)
do (goto-char (point-min))
and
collect (cl-loop while (re-search-forward w2 nil t)
collect (save-excursion (go-back-previous-line)
(point-at-bol)))))))
(matches-3 (save-excursion
(cl-remove-duplicates
(cl-loop for w3 in words-3
if (string-equal w3 "#bobp#")
collect '(0)
else
if (string-equal w3 "#eobp#")
collect `(,(point-max))
else
if (string-match ".*[a-zA-Z0-9]+.*" w3)
do (goto-char (point-min))
and
collect (cl-loop while (re-search-forward w3 nil t)
collect (save-excursion (go-back-next-line)
(point-at-bol))))))))
(let* ((all-matches (sort (append (apply 'append matches-1)
(apply 'append matches-2)
(apply 'append matches-3))
(lambda (a b)
(< a b))))
(last-match (car all-matches))
(counter 0)
(longest-counter 0)
(longest-matches `(,last-match))
(closest-diff nil)
(closest-match nil))
(when all-matches
(cl-dolist (current-match all-matches)
(if (eq current-match last-match)
(setq counter (1+ counter))
(when (eq counter longest-counter)
(setq longest-matches (append longest-matches `(,last-match))))
(when (> counter longest-counter)
(setq longest-counter counter
longest-matches `(,last-match)))
(setq last-match current-match
counter 1)))
(cl-dolist (current-match longest-matches)
(when (or (not closest-match)
(< (abs (- p current-match)) closest-diff))
(setq closest-diff (abs (- p current-match))
closest-match current-match)))
(goto-char closest-match)
(let* ((offset nil)
(from (save-excursion (dotimes (n 2) (go-back-previous-line))
(point-at-bol)))
(to (save-excursion (dotimes (n 2) (go-back-next-line))
(point-at-eol)))
(new-p (cond ((and (>= (length re-left) (length re-right))
(setq offset (save-excursion (goto-char from)
(when (re-search-forward re-left to t)
(- (point) closest-match)))))
(+ closest-match offset))
((and (< (length re-left) (length re-right))
(setq offset (save-excursion (goto-char from)
(when (re-search-forward re-right to t)
(- (point) closest-match)))))
(- (+ closest-match offset) (length line-right)))
(t
(+ closest-match (length line-left))))))
(goto-char new-p)))))
(point))))
;; search for complete line in buffer
(unless final-point
(setq final-point
(save-excursion
(goto-char (point-min))
(cond ((and (> (length (concat re-left re-right)) 1)
(re-search-forward (concat re-left re-right) nil t))
(- (point) (length line-right)))
((and (> (length re-left) 1)
(re-search-forward re-left nil t))
(point))
((and (> (length re-right) 1)
(re-search-forward re-right nil t))
(- (point) (length line-right)))))))
;; move to final point
(goto-char (or final-point p)))))
(defun go-back-make-location ()
(save-excursion
(when (go-back-ignore-line-p)
(go-back-previous-line)
(goto-char (point-at-eol)))
(list (current-buffer)
(point)
(window-start)
(buffer-substring-no-properties (point-at-bol) (point))
(buffer-substring-no-properties (point) (point-at-eol))
(save-excursion
(go-back-previous-line)
(buffer-substring-no-properties (point-at-bol) (point-at-eol)))
(save-excursion
(go-back-next-line)
(buffer-substring-no-properties (point-at-bol) (point-at-eol)))
)))
(defun go-back-dump-state ()
(interactive)
(let ((l go-back-past)
(r go-back-future))
(message (concat "["
(mapconcat #'prin1-to-string (mapcar #'cl-second l) ",")
"],"
(prin1-to-string (cl-second go-back-current))
","
(prin1-to-string (cl-second go-back-before))
",["
(mapconcat #'prin1-to-string (mapcar #'cl-second r) ",")
"] cost: " (prin1-to-string go-back-last-jump-cost)))))
(cl-defun go-back-shift (&optional (direction :left))
(interactive)
(cl-case direction
(:right
(when (car (last go-back-past))
(add-to-list 'go-back-future (car (last go-back-past)))
(add-to-list 'go-back-history `(shift ,direction))
(setq go-back-past (butlast go-back-past))
(when (null go-back-past)
(setq go-back-past (last go-back-future)
go-back-future (butlast go-back-future)))
(setq go-back-current (car (last go-back-past)))))
(:left
(when (car go-back-future)
(add-to-list 'go-back-past (car go-back-future) t)
(add-to-list 'go-back-history `(shift ,direction))
(setq go-back-future (cdr go-back-future))
(when (null go-back-future)
(setq go-back-future (list (cl-first go-back-past))
go-back-past (cdr go-back-past))))
(setq go-back-current (car go-back-future)))
))
(defun go-back-loc-equal (a b)
(or (and (eq (nth 0 a) (nth 0 b))
(string-equal (nth 3 a) (nth 3 b))
(string-equal (nth 4 a) (nth 4 b)))
(and (equal (nth 0 a) (nth 0 b))
(= (nth 1 a) (nth 1 b)))))
(cl-defun go-back-push (&optional loc (direction :left))
(interactive)
(push-mark)
(unless loc
(setq loc (go-back-make-location)))
(cl-case direction
(:right
(setq go-back-future (cl-remove-if (lambda (x) (go-back-loc-equal x loc)) go-back-future))
(add-to-list 'go-back-future loc nil 'go-back-loc-equal)
(add-to-list 'go-back-history `(insert ,direction))
(setq go-back-current loc))
(:left
(setq go-back-past (cl-remove-if (lambda (x) (go-back-loc-equal x loc)) go-back-past))
(add-to-list 'go-back-past loc t 'go-back-loc-equal)
(add-to-list 'go-back-history `(insert ,direction))
(setq go-back-current loc))))
(cl-defun go-back-remove (&optional (direction :left))
(interactive)
(cl-case direction
(:right
(when go-back-future
(add-to-list 'go-back-history `(remove ,direction ,(car go-back-future)))
(when (eq (car go-back-future) go-back-current)
(setq go-back-current (car (cdr go-back-future))))
(setq go-back-future (cdr go-back-future))))
(:left
(when go-back-past
(add-to-list 'go-back-history `(remove ,direction ,(car (last go-back-past))))
(when (eq (car (last go-back-past)) go-back-current)
(setq go-back-current (car (last (butlast go-back-past)))))
(setq go-back-past (butlast go-back-past))))))
(defun go-back-prev ()
(interactive)
(let ((used-pop-tag-marker nil))
(cl-dolist (ov (overlays-at (point)))
(let ((marker (overlay-get ov 'pop-tag-marker)))
(when (and marker
(not (eq (marker-buffer marker) (current-buffer))))
(switch-to-buffer (or (marker-buffer marker)
(error "The marked buffer has been deleted")))
(goto-char (marker-position marker))
(set-marker marker nil nil)
(overlay-put ov 'pop-tag-marker nil)
(setq used-pop-tag-marker t))))
(unless used-pop-tag-marker
(let* ((loc (go-back-make-location)))
(cl-case last-command
(go-back-prev
(go-back-shift :right)
(go-back-go (car (last go-back-past)))
(setq go-back-current (car (last go-back-past)))
)
(go-back-next
(go-back-go (car (last go-back-past)))
(setq go-back-current (car (last go-back-past)))
)
(t
(let ((invoke-location (go-back-make-location)))
(go-back-go go-back-current)
(setq go-back-before invoke-location)
(when (= (point) (nth 1 invoke-location))
(go-back-shift :right)
(setq go-back-current (car (last go-back-past)))
(go-back-go go-back-current)
(setq go-back-before invoke-location))
(when (eq go-back-current (car go-back-future))
(go-back-shift :left))
(go-back-push loc :right)
(setq go-back-current (car (last go-back-past))))
))))))
;; blah
;; foo
;; bar
(defun go-back-next ()
(interactive)
(let* ((loc (go-back-make-location)))
(cl-case last-command
(go-back-next
(go-back-shift :left)
(go-back-go (car go-back-future))
(setq go-back-current (car go-back-future))
)
(go-back-prev
(go-back-go (car go-back-future))
(setq go-back-current (car go-back-future))
)
(t
(if go-back-before
(progn
(go-back-go go-back-before)
(setq go-back-before nil))
(setq go-back-current (car go-back-future))
(go-back-go go-back-current))
))))
(defvar go-back-trigger-command-symbols '((isearch-mode
isearch-forward
isearch-repeat-forward
isearch-backward
isearch-repeat-backward
isearch-resume
isearch-printing-char
isearch-abort
isearch-exit
isearch-other-control-char
query-replace-regexp)
(undo-tree-undo
undo-tree-redo)
(highlight-symbol-prev
highlight-symbol-jump
highlight-symbol-next
highlight-symbol-jump
smartscan-symbol-go-forward
smartscan-symbol-go-backward
smartscan-symbol-replace)
(sourcemarker-visit)
(ace-jump-mode)
(imenu
imenu-many)
(etags-select-find-tag
find-tag
pop-tag-mark
tags-search
tags-loop-continue)
(mwheel-scroll
cua-scroll-up
cua-scroll-down
scroll-up
scroll-up-mark
scroll-up-nomark
scroll-up-command
scroll-down
scroll-down-mark
scroll-down-nomark
scroll-down-command
beginning-of-buffer
end-of-buffer
;;next-line
;;previous-line
)
(save-buffer
rakete:save-buffer
switch-to-buffer
ido-switch-buffer
rakete:save-window-excursion-buffer
rakete:highlight-symbol)
(eval-defun
eval-last-sexp
eval-buffer
eval-region
rakete:eval-region-or-defun
compile
lazy-compile)
(lazy-jump-definition
lazy-jump-regexp)))
;; (setq go-back-cursor-commands '((next-line
;; next-line-mark
;; next-line-nomark
;; previous-line
;; previous-line-mark
;; previous-line-nomark
;; backward-char-mark
;; backward-char-nomark
;; backward-word
;; backward-word-mark
;; backward-word-nomark
;; backward-sexp
;; backward-sexp-mark
;; backward-sexp-nomark
;; backward-sentence
;; backward-paragraph
;; backward-paragraph-mark
;; backward-paragraph-nomark
;; forward-char-mark
;; forward-char-nomark
;; forward-word
;; forward-word-mark
;; forward-word-nomark
;; forward-sexp
;; forward-sexp-mark
;; forward-sexp-nomark
;; forward-sentence
;; forward-paragraph
;; forward-paragraph-mark
;; forward-paragraph-nomark
;; end-of-line
;; end-of-line-mark
;; end-of-line-nomark
;; beginning-of-line
;; beginning-of-line-mark
;; beginning-of-line-nomark)))
(defun go-back-pre-command-trigger ()
(let* ((tc this-command)
(lc last-command)
(triggered nil)
(pushed nil))
(unless (or (eq tc 'go-back-next)
(eq tc 'go-back-prev)
(eq tc 'go-back-push)
(eq tc 'go-back-pre-command-trigger))
(cl-loop for ys in go-back-trigger-command-symbols
until (when (cl-some (lambda (yc) (eq tc yc)) ys)
(setq triggered `(command ,ys))))
(when triggered
(unless (cl-some (lambda (yc) (eq lc yc)) (cl-second triggered))
(unless (or (eq lc 'go-back-next)
(eq lc 'go-back-prev)
(eq lc 'go-back-push))
(when (buffer-file-name (current-buffer))
(setq pushed (go-back-push))))))
(unless pushed
(cl-dolist (ov (overlays-at (point)))
(unless (overlay-get ov 'go-back-to)
(when (eq (overlay-get ov 'jump-highlight) 'view)
(overlay-put ov 'go-back-to t)
(go-back-push))))))))
(eval-after-load "go-back"
'(progn
;;(kill-local-variable 'pre-command-hook)
(add-hook 'pre-command-hook 'go-back-pre-command-trigger)))
(provide 'go-back)