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+;;; org-link-edit.el --- Slurp and barf with Org links -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2015 Kyle Meyer <kyle@kyleam.com>
+
+;; Author: Kyle Meyer <kyle@kyleam.com>
+;; URL: https://github.com/kyleam/org-link-edit
+;; Keywords: convenience
+;; Version: 1.0.1
+;; Package-Requires: ((cl-lib "0.5") (org "8.2"))
+
+;; 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 <http://www.gnu.org/licenses/>.
+
+;;; Commentary:
+
+;; Org Link Edit provides Paredit-inspired slurping and barfing
+;; commands for Org link descriptions.
+;;
+;; There are four commands, all which operate when point is on an Org
+;; link.
+;;
+;; - org-link-edit-forward-slurp
+;; - org-link-edit-backward-slurp
+;; - org-link-edit-forward-barf
+;; - org-link-edit-backward-barf
+;;
+;; Org Link Edit doesn't bind these commands to any keys. Finding
+;; good keys for these commands is difficult because, while it's
+;; convenient to be able to quickly repeat these commands, they won't
+;; be used frequently enough to be worthy of a short, repeat-friendly
+;; binding. Using Hydra [1] provides a nice solution to this. After
+;; an initial key sequence, any of the commands will be repeatable
+;; with a single key. (Plus, you get a nice interface that displays
+;; the key for each command.) Below is one example of how you could
+;; configure this.
+;;
+;; (define-key org-mode-map YOUR-KEY
+;; (defhydra hydra-org-link-edit ()
+;; "Org Link Edit"
+;; ("j" org-link-edit-forward-slurp "forward slurp")
+;; ("k" org-link-edit-forward-barf "forward barf")
+;; ("u" org-link-edit-backward-slurp "backward slurp")
+;; ("i" org-link-edit-backward-barf "backward barf")
+;; ("q" nil "cancel")))
+;;
+;; [1] https://github.com/abo-abo/hydra
+
+;;; Code:
+
+(require 'org)
+(require 'org-element)
+(require 'cl-lib)
+
+(defun org-link-edit--get-link-data ()
+ "Return list with information about the link at point.
+The list includes
+- the position at the start of the link
+- the position at the end of the link
+- the link text
+- the link description (nil when on a plain link)"
+ (let ((el (org-element-context)))
+ ;; Don't use `org-element-lineage' because it isn't available
+ ;; until Org version 8.3.
+ (while (and el (not (memq (car el) '(link))))
+ (setq el (org-element-property :parent el)))
+ (unless (eq (car el) 'link)
+ (user-error "Point is not on a link"))
+ (save-excursion
+ (goto-char (org-element-property :begin el))
+ (cond
+ ;; Use match-{beginning,end} because match-end is consistently
+ ;; positioned after ]], while the :end property is positioned
+ ;; at the next word on the line, if one is present.
+ ((looking-at org-bracket-link-regexp)
+ (list (match-beginning 0)
+ (match-end 0)
+ (org-link-unescape (match-string-no-properties 1))
+ (or (and (match-end 3)
+ (match-string-no-properties 3))
+ "")))
+ ((looking-at org-plain-link-re)
+ (list (match-beginning 0)
+ (match-end 0)
+ (org-link-unescape (match-string-no-properties 0))
+ nil))
+ (t
+ (error "What am I looking at?"))))))
+
+(defun org-link-edit--forward-blob (n &optional no-punctuation)
+ "Move forward N blobs (backward if N is negative).
+
+A block of non-whitespace characters is a blob. If
+NO-PUNCTUATION is non-nil, trailing punctuation characters are
+not considered part of the blob when going in the forward
+direction.
+
+If the edge of the buffer is reached before completing the
+movement, return nil. Otherwise, return t."
+ (let* ((forward-p (> n 0))
+ (nblobs (abs n))
+ (skip-func (if forward-p 'skip-syntax-forward 'skip-syntax-backward))
+ skip-func-retval)
+ (while (/= nblobs 0)
+ (funcall skip-func " ")
+ (setq skip-func-retval (funcall skip-func "^ "))
+ (setq nblobs (1- nblobs)))
+ (when (and forward-p no-punctuation)
+ (let ((punc-tail-offset (save-excursion (skip-syntax-backward "."))))
+ ;; Don't consider trailing punctuation as part of the blob
+ ;; unless the whole blob consists of punctuation.
+ (unless (= skip-func-retval (- punc-tail-offset))
+ (goto-char (+ (point) punc-tail-offset)))))
+ (/= skip-func-retval 0)))
+
+;;;###autoload
+(defun org-link-edit-forward-slurp (&optional n)
+ "Slurp N trailing blobs into link's description.
+
+ The \[\[http://orgmode.org/\]\[Org mode\]\] site
+
+ |
+ v
+
+ The \[\[http://orgmode.org/\]\[Org mode site\]\]
+
+A blob is a block of non-whitespace characters. When slurping
+forward, trailing punctuation characters are not considered part
+of a blob.
+
+After slurping, return the slurped text and move point to the
+beginning of the link.
+
+If N is negative, slurp leading blobs instead of trailing blobs."
+ (interactive "p")
+ (setq n (or n 1))
+ (cond
+ ((= n 0))
+ ((< n 0)
+ (org-link-edit-backward-slurp (- n)))
+ (t
+ (cl-multiple-value-bind (beg end link desc) (org-link-edit--get-link-data)
+ (goto-char (save-excursion
+ (goto-char end)
+ (or (org-link-edit--forward-blob n 'no-punctuation)
+ (user-error "Not enough blobs after the link"))
+ (point)))
+ (let ((slurped (buffer-substring-no-properties end (point))))
+ (setq slurped (replace-regexp-in-string "\n+" " " slurped))
+ (when (and (= (length desc) 0)
+ (string-match "^\\s-+\\(.*\\)" slurped))
+ (setq slurped (match-string 1 slurped)))
+ (setq desc (concat desc slurped)
+ end (+ end (length slurped)))
+ (delete-region beg (point))
+ (insert (org-make-link-string link desc))
+ (goto-char beg)
+ slurped)))))
+
+;;;###autoload
+(defun org-link-edit-backward-slurp (&optional n)
+ "Slurp N leading blobs into link's description.
+
+ The \[\[http://orgmode.org/\]\[Org mode\]\] site
+
+ |
+ v
+
+ \[\[http://orgmode.org/\]\[The Org mode\]\] site
+
+A blob is a block of non-whitespace characters.
+
+After slurping, return the slurped text and move point to the
+beginning of the link.
+
+If N is negative, slurp trailing blobs instead of leading blobs."
+ (interactive "p")
+ (setq n (or n 1))
+ (cond
+ ((= n 0))
+ ((< n 0)
+ (org-link-edit-forward-slurp (- n)))
+ (t
+ (cl-multiple-value-bind (beg end link desc) (org-link-edit--get-link-data)
+ (goto-char (save-excursion
+ (goto-char beg)
+ (or (org-link-edit--forward-blob (- n))
+ (user-error "Not enough blobs before the link"))
+ (point)))
+ (let ((slurped (buffer-substring-no-properties (point) beg)))
+ (when (and (= (length desc) 0)
+ (string-match "\\(.*\\)\\s-+$" slurped))
+ (setq slurped (match-string 1 slurped)))
+ (setq slurped (replace-regexp-in-string "\n+" " " slurped))
+ (setq desc (concat slurped desc)
+ beg (- beg (length slurped)))
+ (delete-region (point) end)
+ (insert (org-make-link-string link desc))
+ (goto-char beg)
+ slurped)))))
+
+(defun org-link-edit--split-first-blobs (string n)
+ "Split STRING into (N first blobs . other) cons cell.
+'N first blobs' contains all text from the start of STRING up to
+the start of the N+1 blob. 'other' includes the remaining text
+of STRING. If the number of blobs in STRING is fewer than N,
+'other' is nil."
+ (when (< n 0) (user-error "N cannot be negative"))
+ (with-temp-buffer
+ (insert string)
+ (goto-char (point-min))
+ (with-syntax-table org-mode-syntax-table
+ (let ((within-bound (org-link-edit--forward-blob n)))
+ (skip-syntax-forward " ")
+ (cons (buffer-substring 1 (point))
+ (and within-bound
+ (buffer-substring (point) (point-max))))))))
+
+(defun org-link-edit--split-last-blobs (string n)
+ "Split STRING into (other . N last blobs) cons cell.
+'N last blobs' contains all text from the end of STRING back to
+the end of the N+1 last blob. 'other' includes the remaining
+text of STRING. If the number of blobs in STRING is fewer than
+N, 'other' is nil."
+ (when (< n 0) (user-error "N cannot be negative"))
+ (with-temp-buffer
+ (insert string)
+ (goto-char (point-max))
+ (with-syntax-table org-mode-syntax-table
+ (let ((within-bound (org-link-edit--forward-blob (- n))))
+ (skip-syntax-backward " ")
+ (cons (and within-bound
+ (buffer-substring 1 (point)))
+ (buffer-substring (point) (point-max)))))))
+
+;;;###autoload
+(defun org-link-edit-forward-barf (&optional n)
+ "Barf N trailing blobs from link's description.
+
+ The \[\[http://orgmode.org/\]\[Org mode\]\] site
+
+ |
+ v
+
+ The \[\[http://orgmode.org/\]\[Org\]\] mode site
+
+A blob is a block of non-whitespace characters.
+
+After barfing, return the barfed text and move point to the
+beginning of the link.
+
+If N is negative, barf leading blobs instead of trailing blobs."
+ (interactive "p")
+ (setq n (or n 1))
+ (cond
+ ((= n 0))
+ ((< n 0)
+ (org-link-edit-backward-barf (- n)))
+ (t
+ (cl-multiple-value-bind (beg end link desc) (org-link-edit--get-link-data)
+ (when (= (length desc) 0)
+ (user-error "Link has no description"))
+ (pcase-let ((`(,new-desc . ,barfed) (org-link-edit--split-last-blobs
+ desc n)))
+ (unless new-desc (user-error "Not enough blobs in description"))
+ (delete-region beg end)
+ (insert (org-make-link-string link new-desc))
+ (if (string= new-desc "")
+ ;; Two brackets are dropped when an empty description is
+ ;; passed to `org-make-link-string'.
+ (progn (goto-char (- end (+ 2 (length desc))))
+ (setq barfed (concat " " barfed)))
+ (goto-char (- end (- (length desc) (length new-desc)))))
+ (insert barfed)
+ (goto-char beg)
+ barfed)))))
+
+;;;###autoload
+(defun org-link-edit-backward-barf (&optional n)
+ "Barf N leading blobs from link's description.
+
+ The \[\[http://orgmode.org/\]\[Org mode\]\] site
+
+ |
+ v
+
+ The Org \[\[http://orgmode.org/\]\[mode\]\] site
+
+A blob is a block of non-whitespace characters.
+
+After barfing, return the barfed text and move point to the
+beginning of the link.
+
+If N is negative, barf trailing blobs instead of leading blobs."
+ (interactive "p")
+ (setq n (or n 1))
+ (cond
+ ((= n 0))
+ ((< n 0)
+ (org-link-edit-forward-barf (- n)))
+ (t
+ (cl-multiple-value-bind (beg end link desc) (org-link-edit--get-link-data)
+ (when (= (length desc) 0)
+ (user-error "Link has no description"))
+ (pcase-let ((`(,barfed . ,new-desc) (org-link-edit--split-first-blobs
+ desc n)))
+ (unless new-desc (user-error "Not enough blobs in description"))
+ (delete-region beg end)
+ (insert (org-make-link-string link new-desc))
+ (when (string= new-desc "")
+ (setq barfed (concat barfed " ")))
+ (goto-char beg)
+ (insert barfed)
+ (goto-char (+ beg (length barfed)))
+ barfed)))))
+
+(provide 'org-link-edit)
+;;; org-link-edit.el ends here