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| | ;;; semantic/mru-bookmark.el --- Automatic bookmark tracking
;; Copyright (C) 2007-2020 Free Software Foundation, Inc.
;; Author: Eric M. Ludlam <zappo@gnu.org>
;; This file is part of GNU Emacs.
;; GNU Emacs 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.
;; GNU Emacs 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 GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
;;; Commentary:
;;
;; Using editing hooks, track the most recently visited or poked tags,
;; and keep a list of them, with the current point in from, and sorted
;; by most recently used.
;;
;; I envision this would be used in place of switch-buffers once
;; someone got the hang of it.
;;
;; I'd also like to see this used to provide some nice defaults for
;; other programs where logical destinations or targets are the tags
;; that have been recently edited.
;;
;; Quick Start:
;;
;; M-x global-semantic-mru-bookmark-mode RET
;;
;; < edit some code >
;;
;; C-x B <select a tag name> RET
;;
;; In the above, the history is pre-filled with the tags you recently
;; edited in the order you edited them.
;;; Code:
(require 'semantic)
(require 'eieio-base)
(require 'ring)
(declare-function data-debug-new-buffer "data-debug")
(declare-function data-debug-insert-object-slots "eieio-datadebug")
(declare-function semantic-momentary-highlight-tag "semantic/decorate")
(declare-function semantic-tag-similar-p "semantic/tag-ls")
;;; TRACKING CORE
;;
;; Data structure for tracking MRU tag locations
(defclass semantic-bookmark (eieio-named)
((tag :initarg :tag
:type semantic-tag
:documentation "The TAG this bookmark belongs to.")
(parent :type (or semantic-tag null)
:documentation "The tag that is the parent of :tag.")
(offset :type number
:documentation "The offset from `tag' start that is
somehow interesting.")
(filename :type string
:documentation "String the tag belongs to.
Set this when the tag gets unlinked from the buffer it belongs to.")
(frequency :type number
:initform 0
:documentation "Track the frequency this tag is visited.")
(reason :type symbol
:initform t
:documentation
"The reason this tag is interesting.
Nice values include the following:
edit - created because the tag text was edited.
read - created because point lingered in tag text.
jump - jumped to another tag from this tag.
mark - created a regular mark in this tag.")
)
"A single bookmark.")
(cl-defmethod initialize-instance :after ((sbm semantic-bookmark) &rest fields)
"Initialize the bookmark SBM with details about :tag."
(condition-case nil
(save-excursion
(oset sbm filename (semantic-tag-file-name (oref sbm tag)))
(semantic-go-to-tag (oref sbm tag))
(oset sbm parent (semantic-current-tag-parent)))
(error (message "Error bookmarking tag.")))
)
(cl-defmethod semantic-mrub-visit ((sbm semantic-bookmark))
"Visit the semantic tag bookmark SBM.
Uses `semantic-go-to-tag' and highlighting."
(require 'semantic/decorate)
(with-slots (tag filename) sbm
;; Go to the tag
(when (not (semantic-tag-in-buffer-p tag))
(let ((fn (or (semantic-tag-file-name tag)
filename)))
(set-buffer (find-file-noselect fn))))
(semantic-go-to-tag (oref sbm tag) (oref sbm parent))
;; Go back to the offset.
(condition-case nil
(let ((o (oref sbm offset)))
(forward-char o))
(error nil))
;; make it visible
(pop-to-buffer-same-window (current-buffer))
(semantic-momentary-highlight-tag tag)
))
(cl-defmethod semantic-mrub-update ((sbm semantic-bookmark) point reason)
"Update the existing bookmark SBM.
POINT is some important location.
REASON is a symbol. See slot `reason' on `semantic-bookmark'."
(condition-case nil
(progn
(with-slots (tag offset frequency) sbm
(setq offset (- point (semantic-tag-start tag)))
(setq frequency (1+ frequency))
)
(oset sbm reason reason))
;; This can fail on XEmacs at miscellaneous times.
(error nil))
)
(cl-defmethod semantic-mrub-preflush ((sbm semantic-bookmark))
"Method called on a tag before the current buffer list of tags is flushed.
If there is a buffer match, unlink the tag."
(let ((tag (oref sbm tag))
(parent (when (slot-boundp sbm 'parent)
(oref sbm parent))))
(let ((b (semantic-tag-in-buffer-p tag)))
(when (and b (eq b (current-buffer)))
(semantic--tag-unlink-from-buffer tag)))
(when parent
(let ((b (semantic-tag-in-buffer-p parent)))
(when (and b (eq b (current-buffer)))
(semantic--tag-unlink-from-buffer parent))))))
(defclass semantic-bookmark-ring ()
((ring :initarg :ring
:type ring
:documentation
"List of `semantic-bookmark' objects.
This list is maintained as a list with the first item
being the current location, and the rest being a list of
items that were recently visited.")
(current-index :initform 0
:type number
:documentation
"The current index into RING for some operation.
User commands use this to move through the ring, or reset.")
)
"Track the current MRU stack of bookmarks.
We can't use the built-in ring data structure because we need
to delete some items from the ring when we don't have the data.")
(defvar semantic-mru-bookmark-ring (semantic-bookmark-ring
:ring (make-ring 20))
"The MRU bookmark ring.
This ring tracks the most recent active tags of interest.")
(defun semantic-mrub-find-nearby-tag (point)
"Find a nearby tag to be pushed for this current location.
Argument POINT is where to find the tag near."
;; I thought this was a good idea, but it is not!
;;(semantic-fetch-tags) ;; Make sure everything is up-to-date.
(let ((tag (semantic-current-tag)))
(when (or (not tag) (semantic-tag-of-class-p tag 'type))
(let ((nearby (or (semantic-find-tag-by-overlay-next point)
(semantic-find-tag-by-overlay-prev point))))
(when nearby (setq tag nearby))))
tag))
(cl-defmethod semantic-mrub-push ((sbr semantic-bookmark-ring) point
&optional reason)
"Add a bookmark to the ring SBR from POINT.
REASON is why it is being pushed. See doc for `semantic-bookmark'
for possible reasons.
The resulting bookmark is then sorted within the ring."
(let* ((ring (oref sbr ring))
(tag (semantic-mrub-find-nearby-tag (point)))
(idx 0))
(when tag
(while (and (not (ring-empty-p ring)) (< idx (ring-size ring)))
(if (semantic-tag-similar-p (oref (ring-ref ring idx) tag)
tag)
(ring-remove ring idx))
(setq idx (1+ idx)))
;; Create a new mark
(let ((sbm (semantic-bookmark (semantic-tag-name tag)
:tag tag)))
;; Take the mark, and update it for the current state.
(ring-insert ring sbm)
(semantic-mrub-update sbm point reason))
)))
(defun semantic-mrub-cache-flush-fcn ()
"Function called in the `semantic-before-toplevel-cache-flush-hook'.
Cause tags in the ring to become unlinked."
(let* ((ring (oref semantic-mru-bookmark-ring ring))
(len (ring-length ring))
(idx 0)
)
(while (< idx len)
(semantic-mrub-preflush (ring-ref ring idx))
(setq idx (1+ idx)))))
(add-hook 'semantic-before-toplevel-cache-flush-hook
'semantic-mrub-cache-flush-fcn)
;;; EDIT tracker
;;
(defvar semantic-mrub-last-overlay nil
"The last overlay bumped by `semantic-mru-bookmark-change-hook-fcn'.")
(defun semantic-mru-bookmark-change-hook-fcn (overlay)
"Function set into `semantic-edits-new/move-change-hook's.
Argument OVERLAY is the overlay created to mark the change.
This function pushes tags onto the tag ring."
;; Dup?
(when (not (eq overlay semantic-mrub-last-overlay))
(setq semantic-mrub-last-overlay overlay)
(semantic-mrub-push semantic-mru-bookmark-ring
(point)
'edit)))
;;; MINOR MODE
;;
;; Tracking minor mode.
(defcustom global-semantic-mru-bookmark-mode nil
"If non-nil, enable `semantic-mru-bookmark-mode' globally.
When this mode is enabled, Emacs keeps track of which tags have
been edited, and you can re-visit them with \\[semantic-mrub-switch-tags]."
:group 'semantic
:group 'semantic-modes
:type 'boolean
:require 'semantic/util-modes
:initialize 'custom-initialize-default
:set (lambda (sym val)
(global-semantic-mru-bookmark-mode (if val 1 -1))))
;;;###autoload
(define-minor-mode global-semantic-mru-bookmark-mode
"Toggle global use of option `semantic-mru-bookmark-mode'."
:global t :group 'semantic :group 'semantic-modes
;; Not needed because it's autoloaded instead.
;; :require 'semantic-util-modes
(semantic-toggle-minor-mode-globally
'semantic-mru-bookmark-mode (if global-semantic-mru-bookmark-mode 1 -1)))
(defcustom semantic-mru-bookmark-mode-hook nil
"Hook run at the end of function `semantic-mru-bookmark-mode'."
:group 'semantic
:type 'hook)
(defvar semantic-mru-bookmark-mode-map
(let ((km (make-sparse-keymap)))
(define-key km "\C-xB" 'semantic-mrub-switch-tags)
km)
"Keymap for mru-bookmark minor mode.")
(define-minor-mode semantic-mru-bookmark-mode
"Minor mode for tracking tag-based bookmarks automatically.
When this mode is enabled, Emacs keeps track of which tags have
been edited, and you can re-visit them with \\[semantic-mrub-switch-tags].
\\{semantic-mru-bookmark-mode-map}
The minor mode can be turned on only if semantic feature is
available and the current buffer was set up for parsing. Return
non-nil if the minor mode is enabled."
:keymap semantic-mru-bookmark-mode-map
(if semantic-mru-bookmark-mode
(if (not (and (featurep 'semantic) (semantic-active-p)))
(progn
;; Disable minor mode if semantic stuff not available
(setq semantic-mru-bookmark-mode nil)
(error "Buffer %s was not set up for parsing"
(buffer-name)))
(add-hook 'semantic-edits-new-change-functions
'semantic-mru-bookmark-change-hook-fcn nil t)
(add-hook 'semantic-edits-move-change-hooks
'semantic-mru-bookmark-change-hook-fcn nil t))
;; Remove hooks
(remove-hook 'semantic-edits-new-change-functions
'semantic-mru-bookmark-change-hook-fcn t)
(remove-hook 'semantic-edits-move-change-hooks
'semantic-mru-bookmark-change-hook-fcn t)))
(semantic-add-minor-mode 'semantic-mru-bookmark-mode
"k")
;;; COMPLETING READ
;;
;; Ask the user for a tag in MRU order.
(defun semantic-mrub-read-history nil
"History of `semantic-mrub-completing-read'.")
(defun semantic-mrub-ring-to-assoc-list (ring)
"Convert RING into an association list for completion."
(let ((idx 0)
(len (ring-length ring))
(al nil))
(while (< idx len)
(let ((r (ring-ref ring idx)))
(setq al (cons (cons (oref r object-name) r)
al)))
(setq idx (1+ idx)))
(nreverse al)))
(defun semantic-mrub-completing-read (prompt)
"Do a `completing-read' on elements from the mru bookmark ring.
Argument PROMPT is the prompt to use when reading."
(if (ring-empty-p (oref semantic-mru-bookmark-ring ring))
(error "Semantic Bookmark ring is currently empty"))
(let* ((ring (oref semantic-mru-bookmark-ring ring))
(ans nil)
(alist (semantic-mrub-ring-to-assoc-list ring))
(first (cdr (car alist)))
(semantic-mrub-read-history nil)
)
;; Don't include the current tag.. only those that come after.
(if (semantic-equivalent-tag-p (oref first tag)
(semantic-current-tag))
(setq first (cdr (car (cdr alist)))))
;; Create a fake history list so we don't have to bind
;; M-p and M-n to our special cause.
(let ((elts (reverse alist)))
(while elts
(setq semantic-mrub-read-history
(cons (car (car elts)) semantic-mrub-read-history))
(setq elts (cdr elts))))
(setq semantic-mrub-read-history (nreverse semantic-mrub-read-history))
;; Do the read/prompt
(let ((prompt (if first (format "%s (%s): " prompt
(semantic-format-tag-name
(oref first tag) t)
)
(concat prompt ": ")))
)
(setq ans
(completing-read prompt alist nil nil nil 'semantic-mrub-read-history)))
;; Calculate the return tag.
(if (string= ans "")
(setq ans first)
;; Return the bookmark object.
(setq ans (assoc ans alist))
(if ans
(cdr ans)
;; no match. Custom word. Look it up somewhere?
nil)
)))
(defun semantic-mrub-switch-tags (tagmark)
"Switch tags to TAGMARK.
Selects a new tag via prompt through the mru tag ring.
Jumps to the tag and highlights it briefly."
(interactive (list (semantic-mrub-completing-read "Switch to tag")))
(if (not (semantic-bookmark-p tagmark))
(signal 'wrong-type-argument tagmark))
(semantic-mrub-push semantic-mru-bookmark-ring
(point)
'jump)
(semantic-mrub-visit tagmark)
)
;;; Debugging
;;
(defun semantic-adebug-mrub ()
"Display a list of items in the MRU bookmarks list.
Useful for debugging mrub problems."
(interactive)
(require 'eieio-datadebug)
(let* ((out semantic-mru-bookmark-ring))
(data-debug-new-buffer "*TAG RING ADEBUG*")
(data-debug-insert-object-slots out "]")
))
(provide 'semantic/mru-bookmark)
;; Local variables:
;; generated-autoload-file: "loaddefs.el"
;; generated-autoload-load-name: "semantic/mru-bookmark"
;; End:
;;; semantic/mru-bookmark.el ends here
|