--- /dev/null
+;;; avy-jump.el --- jump to things tree-style. -*- lexical-binding: t -*-
+
+;; Copyright (C) 2015 Free Software Foundation, Inc.
+
+;; Author: Oleh Krehel
+;; URL: https://github.com/abo-abo/avy-jump
+;; Version: 0.1.0
+;; Keywords: point, location
+
+;; This file is part of GNU Emacs.
+
+;; This file 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, 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.
+
+;; For a full copy of the GNU General Public License
+;; see <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+;;
+;; This package offers various commands for navigating to things using `avy'.
+;; They are in the "Commands" outline.
+
+;;; Code:
+;;* Requires
+(require 'avy)
+
+;;* Customization
+(defgroup avy-jump nil
+ "Jump to things tree-style."
+ :group 'convenience
+ :prefix "avy-")
+
+(defcustom avy-keys '(?a ?s ?d ?f ?g ?h ?j ?k ?l)
+ "Keys for jumping.")
+
+(defcustom avy-background nil
+ "When non-nil, a gray background will be added during the selection."
+ :type 'boolean)
+
+(defcustom avy-word-punc-regexp "[!-/:-@[-`{-~]"
+ "Regexp of punctuation characters that should be matched when calling
+`avy-goto-word-1' command. When nil, punctuation chars will not be matched.
+
+\"[!-/:-@[-`{-~]\" will match all printable punctuation chars.")
+
+(defface avy-lead-face
+ '((t (:foreground "white" :background "#e52b50")))
+ "Face used for the leading chars.")
+
+(defface avy-background-face
+ '((t (:foreground "gray40")))
+ "Face for whole window background during selection.")
+
+;;* Internals
+(defcustom avy-all-windows t
+ "When non-nil, loop though all windows for candidates."
+ :type 'boolean)
+
+(defmacro avy-dowindows (flip &rest body)
+ "Depending on FLIP and `avy-all-windows' run BODY in each or selected window."
+ (declare (indent 1))
+ `(let ((avy-all-windows (if ,flip
+ (not avy-all-windows)
+ avy-all-windows)))
+ (dolist (wnd (if avy-all-windows
+ (window-list)
+ (list (selected-window))))
+ (with-selected-window wnd
+ (unless (memq major-mode '(image-mode doc-view-mode))
+ ,@body)))))
+
+(defun avy--goto (x)
+ "Goto X.
+X is (POS . WND)
+POS is either a position or (BEG . END)."
+ (if (null x)
+ (message "zero candidates")
+ (select-window (cdr x))
+ (let ((pt (car x)))
+ (when (consp pt)
+ (setq pt (car pt)))
+ (unless (= pt (point)) (push-mark))
+ (goto-char pt))))
+
+(defun avy--process (candidates overlay-fn)
+ "Select one of CANDIDATES using `avy-read'."
+ (unwind-protect
+ (cl-case (length candidates)
+ (0
+ nil)
+ (1
+ (car candidates))
+ (t
+ (avy--make-backgrounds (list (selected-window)))
+ (avy-read (avy-tree candidates avy-keys)
+ overlay-fn
+ #'avy--remove-leading-chars)))
+ (avy--done)))
+
+(defvar avy--overlays-back nil
+ "Hold overlays for when `avy-background' is t.")
+
+(defun avy--make-backgrounds (wnd-list)
+ "Create a dim background overlay for each window on WND-LIST."
+ (when avy-background
+ (setq avy--overlays-back
+ (mapcar (lambda (w)
+ (let ((ol (make-overlay
+ (window-start w)
+ (window-end w)
+ (window-buffer w))))
+ (overlay-put ol 'face 'avy-background-face)
+ ol))
+ wnd-list))))
+
+(defun avy--done ()
+ "Clean up overlays."
+ (mapc #'delete-overlay avy--overlays-back)
+ (setq avy--overlays-back nil)
+ (avy--remove-leading-chars))
+
+(defun avy--regex-candidates (regex &optional wnd beg end pred)
+ "Return all elements that match REGEX in WND.
+Each element of the list is ((BEG . END) . WND)
+When PRED is non-nil, it's a filter for matching point positions."
+ (let (candidates)
+ (avy-dowindows nil
+ (let ((we (or end (window-end (selected-window) t))))
+ (save-excursion
+ (goto-char (or beg (window-start)))
+ (while (re-search-forward regex we t)
+ (unless (get-char-property (point) 'invisible)
+ (when (or (null pred)
+ (funcall pred))
+ (push (cons (cons (match-beginning 0)
+ (match-end 0))
+ wnd) candidates)))))))
+ (nreverse candidates)))
+
+(defvar avy--overlay-offset 0
+ "The offset to apply in `avy--overlay'.")
+
+(defvar avy--overlays-lead nil
+ "Hold overlays for leading chars.")
+
+(defun avy--remove-leading-chars ()
+ "Remove leading char overlays."
+ (mapc #'delete-overlay avy--overlays-lead)
+ (setq avy--overlays-lead nil))
+
+(defun avy--overlay (str pt wnd)
+ "Create an overlay with STR at PT in WND."
+ (when (<= (1+ pt) (with-selected-window wnd (point-max)))
+ (let* ((pt (+ pt avy--overlay-offset))
+ (ol (make-overlay pt (1+ pt) (window-buffer wnd)))
+ (old-str (with-selected-window wnd
+ (buffer-substring pt (1+ pt)))))
+ (when avy-background
+ (setq old-str (propertize
+ old-str 'face 'avy-background-face)))
+ (overlay-put ol 'window wnd)
+ (overlay-put ol 'display (concat str old-str))
+ (push ol avy--overlays-lead))))
+
+(defun avy--overlay-pre (path leaf)
+ "Create an overlay with STR at LEAF.
+PATH is a list of keys from tree root to LEAF.
+LEAF is ((BEG . END) . WND)."
+ (avy--overlay
+ (propertize (apply #'string (reverse path))
+ 'face 'avy-lead-face)
+ (cond ((numberp leaf)
+ leaf)
+ ((consp (car leaf))
+ (caar leaf))
+ (t
+ (car leaf)))
+ (if (consp leaf)
+ (cdr leaf)
+ (selected-window))))
+
+(defun avy--overlay-at (path leaf)
+ "Create an overlay with STR at LEAF.
+PATH is a list of keys from tree root to LEAF.
+LEAF is ((BEG . END) . WND)."
+ (let ((str (propertize
+ (string (car (last path)))
+ 'face 'avy-lead-face))
+ (pt (if (consp (car leaf))
+ (caar leaf)
+ (car leaf)))
+ (wnd (cdr leaf)))
+ (let ((ol (make-overlay pt (1+ pt)
+ (window-buffer wnd)))
+ (old-str (with-selected-window wnd
+ (buffer-substring pt (1+ pt)))))
+ (when avy-background
+ (setq old-str (propertize
+ old-str 'face 'avy-background-face)))
+ (overlay-put ol 'window wnd)
+ (overlay-put ol 'display (if (string= old-str "\n")
+ (concat str "\n")
+ str))
+ (push ol avy--overlays-lead))))
+
+(defun avy--overlay-post (path leaf)
+ "Create an overlay with STR at LEAF.
+PATH is a list of keys from tree root to LEAF.
+LEAF is ((BEG . END) . WND)."
+ (avy--overlay
+ (propertize (apply #'string (reverse path))
+ 'face 'avy-lead-face)
+ (cond ((numberp leaf)
+ leaf)
+ ((consp (car leaf))
+ (cdar leaf))
+ (t
+ (car leaf)))
+ (if (consp leaf)
+ (cdr leaf)
+ (selected-window))))
+
+(defun avy--style-fn (style)
+ "Transform STYLE symbol to a style function."
+ (cl-case style
+ (pre #'avy--overlay-pre)
+ (at #'avy--overlay-at)
+ (post #'avy--overlay-post)
+ (t (error "Unexpected style %S" style))))
+
+(defun avy--generic-jump (regex window-flip style)
+ "Jump to REGEX.
+When WINDOW-FLIP is non-nil, do the opposite of `avy-all-windows'.
+STYLE determines the leading char overlay style."
+ (let ((avy-all-windows
+ (if window-flip
+ (not avy-all-windows)
+ avy-all-windows)))
+ (avy--goto
+ (avy--process
+ (avy--regex-candidates
+ regex)
+ (avy--style-fn style)))))
+
+(defcustom avy-goto-char-style 'pre
+ "Method of displaying the overlays for `avy-goto-char' and `avy-goto-char-2'."
+ :type '(choice
+ (const :tag "Pre" pre)
+ (const :tag "At" at)
+ (const :tag "Post" post)))
+
+(defcustom avy-goto-word-style 'pre
+ "Method of displaying the overlays for `avy-goto-word-0' and `avy-goto-word-0'."
+ :type '(choice
+ (const :tag "Pre" pre)
+ (const :tag "At" at)
+ (const :tag "Post" post)))
+
+;;* Commands
+;;;###autoload
+(defun avy-goto-char (&optional arg)
+ "Read one char and jump to it.
+The window scope is determined by `avy-all-windows' (ARG negates it)."
+ (interactive "P")
+ (avy--generic-jump
+ (let ((c (read-char "char: ")))
+ (if (= 13 c)
+ "\n"
+ (regexp-quote (string c))))
+ arg
+ avy-goto-char-style))
+
+;;;###autoload
+(defun avy-goto-char-2 (&optional arg)
+ "Read two consecutive chars and jump to the first one.
+The window scope is determined by `avy-all-windows' (ARG negates it)."
+ (interactive "P")
+ (avy--generic-jump
+ (regexp-quote (string
+ (read-char "char 1: ")
+ (read-char "char 2: ")))
+ arg
+ avy-goto-char-style))
+
+;;;###autoload
+(defun avy-isearch ()
+ "Jump to one of the current isearch candidates."
+ (interactive)
+ (let* ((candidates
+ (avy--regex-candidates isearch-string))
+ (avy-background nil)
+ (candidate
+ (avy--process candidates #'avy--overlay-post)))
+ (isearch-done)
+ (avy--goto candidate)))
+
+;;;###autoload
+(defun avy-goto-word-0 (arg)
+ "Jump to a word start.
+The window scope is determined by `avy-all-windows' (ARG negates it)."
+ (interactive "P")
+ (let ((avy-keys (number-sequence ?a ?z)))
+ (avy--generic-jump "\\b\\sw" arg avy-goto-word-style)))
+
+;;;###autoload
+(defun avy-goto-word-1 (&optional arg)
+ "Read one char at word start and jump there.
+The window scope is determined by `avy-all-windows' (ARG negates it)."
+ (interactive "P")
+ (let* ((str (string (read-char "char: ")))
+ (regex (cond ((string= str ".")
+ "\\.")
+ ((and avy-word-punc-regexp
+ (string-match avy-word-punc-regexp str))
+ str)
+ (t
+ (concat
+ "\\b"
+ str)))))
+ (avy--generic-jump regex arg avy-goto-word-style)))
+
+(declare-function subword-backward "subword")
+
+;;;###autoload
+(defun avy-goto-subword-0 (&optional arg predicate)
+ "Jump to a word or subword start.
+
+The window scope is determined by `avy-all-windows' (ARG negates it).
+
+When PREDICATE is non-nil it's a function of zero parameters that
+should return true."
+ (interactive "P")
+ (require 'subword)
+ (let ((avy-keys (number-sequence ?a ?z))
+ (case-fold-search nil)
+ candidates)
+ (avy-dowindows arg
+ (let ((ws (window-start)))
+ (save-excursion
+ (goto-char (window-end (selected-window) t))
+ (subword-backward)
+ (while (> (point) ws)
+ (when (or (null predicate)
+ (and predicate (funcall predicate)))
+ (push (cons (point) (selected-window)) candidates))
+ (subword-backward)))))
+ (avy--goto
+ (avy--process candidates (avy--style-fn avy-goto-word-style)))))
+
+;;;###autoload
+(defun avy-goto-subword-1 (&optional arg)
+ "Prompt for a subword start char and jump there.
+The window scope is determined by `avy-all-windows' (ARG negates it).
+The case is ignored."
+ (interactive "P")
+ (let ((char (downcase (read-char "char: "))))
+ (avy-goto-subword-0
+ arg (lambda () (eq (downcase (char-after)) char)))))
+
+(defun avy--line (&optional arg)
+ "Select line in current window."
+ (let ((avy-background nil)
+ candidates)
+ (avy-dowindows arg
+ (let ((ws (window-start)))
+ (save-excursion
+ (save-restriction
+ (narrow-to-region ws (window-end (selected-window) t))
+ (goto-char (point-min))
+ (while (< (point) (point-max))
+ (unless (get-char-property
+ (max (1- (point)) ws) 'invisible)
+ (push (cons (point) (selected-window)) candidates))
+ (forward-line 1))))))
+ (avy--process (nreverse candidates) #'avy--overlay-pre)))
+
+;;;###autoload
+(defun avy-goto-line (&optional arg)
+ "Jump to a line start in current buffer."
+ (interactive "P")
+ (avy--goto (avy--line arg)))
+
+;;;###autoload
+(defun avy-copy-line (arg)
+ "Copy a selected line above the current line.
+ARG lines can be used."
+ (interactive "p")
+ (let ((start (car (avy--line))))
+ (move-beginning-of-line nil)
+ (save-excursion
+ (insert
+ (buffer-substring-no-properties
+ start
+ (save-excursion
+ (goto-char start)
+ (move-end-of-line arg)
+ (point)))
+ "\n"))))
+
+;;;###autoload
+(defun avy-move-line (arg)
+ "Move a selected line above the current line.
+ARG lines can be used."
+ (interactive "p")
+ (let ((start (car (avy--line))))
+ (move-beginning-of-line nil)
+ (save-excursion
+ (save-excursion
+ (goto-char start)
+ (move-end-of-line arg)
+ (kill-region start (point)))
+ (insert
+ (current-kill 0)
+ "\n"))))
+
+;;;###autoload
+(defun avy-copy-region ()
+ "Select two lines and copy the text between them here."
+ (interactive)
+ (let ((beg (car (avy--line)))
+ (end (car (avy--line)))
+ (pad (if (bolp) "" "\n")))
+ (move-beginning-of-line nil)
+ (save-excursion
+ (insert
+ (buffer-substring-no-properties
+ beg
+ (save-excursion
+ (goto-char end)
+ (line-end-position)))
+ pad))))
+
+;;;###autoload
+(defun avy-setup-default ()
+ "Setup the default shortcuts."
+ (eval-after-load 'isearch
+ '(define-key isearch-mode-map (kbd "C-'") 'avy-isearch)))
+
+(define-obsolete-variable-alias 'avi-keys 'avy-keys "0.1.0")
+(define-obsolete-variable-alias 'avi-background 'avy-background "0.1.0")
+(define-obsolete-variable-alias 'avi-word-punc-regexp 'avy-word-punc-regexp "0.1.0")
+(define-obsolete-face-alias 'avi-lead-face 'avy-lead-face "0.1.0")
+(define-obsolete-function-alias 'avi--goto 'avy--goto "0.1.0")
+(define-obsolete-function-alias 'avi--process 'avy--process "0.1.0")
+(define-obsolete-variable-alias 'avi-all-windows 'avy-all-windows "0.1.0")
+(define-obsolete-function-alias 'avi--overlay-pre 'avy--overlay-pre "0.1.0")
+(define-obsolete-function-alias 'avi--overlay-at 'avy--overlay-at "0.1.0")
+(define-obsolete-function-alias 'avi--overlay-post 'avy--overlay-post "0.1.0")
+(define-obsolete-function-alias 'avi-goto-char 'avy-goto-char "0.1.0")
+(define-obsolete-function-alias 'avi-goto-char-2 'avy-goto-char-2 "0.1.0")
+(define-obsolete-function-alias 'avi-isearch 'avy-isearch "0.1.0")
+(define-obsolete-function-alias 'avi-goto-word-0 'avy-goto-word-0 "0.1.0")
+(define-obsolete-function-alias 'avi-goto-subword-0 'avy-goto-subword-0 "0.1.0")
+(define-obsolete-function-alias 'avi-goto-word-1 'avy-goto-word-1 "0.1.0")
+(define-obsolete-function-alias 'avi-goto-line 'avy-goto-line "0.1.0")
+(define-obsolete-function-alias 'avi-copy-line 'avy-copy-line "0.1.0")
+(define-obsolete-function-alias 'avi-move-line 'avy-move-line "0.1.0")
+(define-obsolete-function-alias 'avi-copy-region 'avy-copy-region "0.1.0")
+(define-obsolete-function-alias 'avi--regex-candidates 'avy--regex-candidates "0.1.0")
+
+(provide 'avy-jump)
+
+;;; avy-jump.el ends here