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;;; org-pcomplete.el --- In-buffer completion code

;; Copyright (C) 2004-2012  Free Software Foundation, Inc.
;;
;; Author: Carsten Dominik <carsten at orgmode dot org>
;;         John Wiegley <johnw at gnu dot org>
;; Keywords: outlines, hypermedia, calendar, wp
;; Homepage: http://orgmode.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 <http://www.gnu.org/licenses/>.
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;;; Code:

;;;; Require other packages

(eval-when-compile
  (require 'cl))

(require 'org-macs)
(require 'pcomplete)

(declare-function org-split-string "org" (string &optional separators))
(declare-function org-get-current-options "org-exp" ())
(declare-function org-make-org-heading-search-string "org"
		  (&optional string heading))
(declare-function org-get-buffer-tags "org" ())
(declare-function org-get-tags "org" ())
(declare-function org-buffer-property-keys "org"
		  (&optional include-specials include-defaults include-columns))
(declare-function org-entry-properties "org" (&optional pom which specific))

;;;; Customization variables

(defgroup org-complete nil
  "Outline-based notes management and organizer."
  :tag "Org"
  :group 'org)

(defvar org-drawer-regexp)
(defvar org-property-re)

(defun org-thing-at-point ()
  "Examine the thing at point and let the caller know what it is.
The return value is a string naming the thing at point."
  (let ((beg1 (save-excursion
		(skip-chars-backward (org-re "[:alnum:]_@"))
		(point)))
	(beg (save-excursion
	       (skip-chars-backward "a-zA-Z0-9_:$")
	       (point)))
	(line-to-here (buffer-substring (point-at-bol) (point))))
    (cond
     ((string-match "\\`[ \t]*#\\+begin: clocktable[ \t]+" line-to-here)
      (cons "block-option" "clocktable"))
     ((string-match "\\`[ \t]*#\\+begin_src[ \t]+" line-to-here)
      (cons "block-option" "src"))
     ((save-excursion
	(re-search-backward "^[ \t]*#\\+\\([A-Z_]+\\):.*"
			    (line-beginning-position) t))
      (cons "file-option" (match-string-no-properties 1)))
     ((string-match "\\`[ \t]*#\\+[a-zA-Z]*\\'" line-to-here)
      (cons "file-option" nil))
     ((equal (char-before beg) ?\[)
      (cons "link" nil))
     ((equal (char-before beg) ?\\)
      (cons "tex" nil))
     ((string-match "\\`\\*+[ \t]+\\'"
		    (buffer-substring (point-at-bol) beg))
      (cons "todo" nil))
     ((equal (char-before beg) ?*)
      (cons "searchhead" nil))
     ((and (equal (char-before beg1) ?:)
	   (equal (char-after (point-at-bol)) ?*))
      (cons "tag" nil))
     ((and (equal (char-before beg1) ?:)
	   (not (equal (char-after (point-at-bol)) ?*))
	   (save-excursion
	     (move-beginning-of-line 1)
	     (skip-chars-backward "[ \t\n]")
	     (or (looking-back org-drawer-regexp)
		 (looking-back org-property-re))))
      (cons "prop" nil))
     ((and (equal (char-before beg1) ?:)
	   (not (equal (char-after (point-at-bol)) ?*)))
      (cons "drawer" nil))
     (t nil))))

(defun org-command-at-point ()
  "Return the qualified name of the Org completion entity at point.
When completing for #+STARTUP, for example, this function returns
\"file-option/startup\"."
  (let ((thing (org-thing-at-point)))
    (cond
     ((string= "file-option" (car thing))
      (concat (car thing) "/" (downcase (cdr thing))))
     ((string= "block-option" (car thing))
      (concat (car thing) "/" (downcase (cdr thing))))
     (t
      (car thing)))))

(defun org-parse-arguments ()
  "Parse whitespace separated arguments in the current region."
  (let ((begin (line-beginning-position))
	(end (line-end-position))
	begins args)
    (save-restriction
      (narrow-to-region begin end)
      (save-excursion
	(goto-char (point-min))
	(while (not (eobp))
	  (skip-chars-forward " \t\n[")
	  (setq begins (cons (point) begins))
	  (skip-chars-forward "^ \t\n[")
	  (setq args (cons (buffer-substring-no-properties
			    (car begins) (point))
			   args)))
	(cons (reverse args) (reverse begins))))))


(defun org-pcomplete-initial ()
  "Calls the right completion function for first argument completions."
  (ignore
   (funcall (or (pcomplete-find-completion-function
		 (car (org-thing-at-point)))
		pcomplete-default-completion-function))))

(defvar org-additional-option-like-keywords)
(defun pcomplete/org-mode/file-option ()
  "Complete against all valid file options."
  (require 'org-exp)
  (pcomplete-here
   (org-pcomplete-case-double
    (mapcar (lambda (x)
	      (if (= ?: (aref x (1- (length x))))
		  (concat x " ")
		x))
	    (delq nil
		  (pcomplete-uniqify-list
		   (append
		    (mapcar (lambda (x)
			      (if (string-match "^#\\+\\([A-Z_]+:?\\)" x)
				  (match-string 1 x)))
			    (org-split-string (org-get-current-options) "\n"))
		    org-additional-option-like-keywords)))))
   (substring pcomplete-stub 2)))

(defvar org-startup-options)
(defun pcomplete/org-mode/file-option/startup ()
  "Complete arguments for the #+STARTUP file option."
  (while (pcomplete-here
	  (let ((opts (pcomplete-uniqify-list
		       (mapcar 'car org-startup-options))))
	    ;; Some options are mutually exclusive, and shouldn't be completed
	    ;; against if certain other options have already been seen.
	    (dolist (arg pcomplete-args)
	      (cond
	       ((string= arg "hidestars")
		(setq opts (delete "showstars" opts)))))
	    opts))))

(defun pcomplete/org-mode/file-option/bind ()
  "Complete arguments for the #+BIND file option, which are variable names"
  (let (vars)
    (mapatoms
     (lambda (a) (if (boundp a) (setq vars (cons (symbol-name a) vars)))))
    (pcomplete-here vars)))

(defvar org-link-abbrev-alist-local)
(defvar org-link-abbrev-alist)
(defun pcomplete/org-mode/link ()
  "Complete against defined #+LINK patterns."
  (pcomplete-here
   (pcomplete-uniqify-list
    (copy-sequence
     (append (mapcar 'car org-link-abbrev-alist-local)
	     (mapcar 'car org-link-abbrev-alist))))))

(defvar org-entities)
(defun pcomplete/org-mode/tex ()
  "Complete against TeX-style HTML entity names."
  (require 'org-entities)
  (while (pcomplete-here
	  (pcomplete-uniqify-list (remove nil (mapcar 'car-safe org-entities)))
	  (substring pcomplete-stub 1))))

(defvar org-todo-keywords-1)
(defun pcomplete/org-mode/todo ()
  "Complete against known TODO keywords."
  (pcomplete-here (pcomplete-uniqify-list (copy-sequence org-todo-keywords-1))))

(defvar org-todo-line-regexp)
(defun pcomplete/org-mode/searchhead ()
  "Complete against all headings.
This needs more work, to handle headings with lots of spaces in them."
  (while
   (pcomplete-here
    (save-excursion
      (goto-char (point-min))
      (let (tbl)
	(while (re-search-forward org-todo-line-regexp nil t)
	  (push (org-make-org-heading-search-string
		 (match-string-no-properties 3) t)
		tbl))
	(pcomplete-uniqify-list tbl)))
    (substring pcomplete-stub 1))))

(defvar org-tag-alist)
(defun pcomplete/org-mode/tag ()
  "Complete a tag name.  Omit tags already set."
  (while (pcomplete-here
	  (mapcar (lambda (x)
		    (concat x ":"))
		  (let ((lst (pcomplete-uniqify-list
			      (or (remove
				   nil
				   (mapcar (lambda (x)
					     (and (stringp (car x)) (car x)))
					   org-tag-alist))
				  (mapcar 'car (org-get-buffer-tags))))))
		    (dolist (tag (org-get-tags))
		      (setq lst (delete tag lst)))
		    lst))
	  (and (string-match ".*:" pcomplete-stub)
	       (substring pcomplete-stub (match-end 0))))))

(defun pcomplete/org-mode/prop ()
  "Complete a property name.  Omit properties already set."
  (pcomplete-here
   (mapcar (lambda (x)
	     (concat x ": "))
	   (let ((lst (pcomplete-uniqify-list
		       (copy-sequence
			(org-buffer-property-keys nil t t)))))
	     (dolist (prop (org-entry-properties))
	       (setq lst (delete (car prop) lst)))
	     lst))
   (substring pcomplete-stub 1)))

(defvar org-drawers)

(defun pcomplete/org-mode/drawer ()
  "Complete a drawer name."
  (let ((spc (save-excursion
	       (move-beginning-of-line 1)
	       (looking-at "^\\([ \t]*\\):")
	       (match-string 1)))
	(cpllist (mapcar (lambda (x) (concat x ": ")) org-drawers)))
    (pcomplete-here cpllist
     (substring pcomplete-stub 1)
     (unless (or (not (delete
		       nil
		       (mapcar (lambda(x)
				 (string-match (substring pcomplete-stub 1) x))
			       cpllist)))
		 (looking-at "[ \t]*\n.*:END:"))
       (save-excursion (insert "\n" spc ":END:"))))))

(defun pcomplete/org-mode/block-option/src ()
  "Complete the arguments of a begin_src block.
Complete a language in the first field, the header arguments and switches."
  (pcomplete-here
   (mapcar
    (lambda(x) (symbol-name (nth 3 x)))
    (cdr (car (cdr (memq :key-type (plist-get
				    (symbol-plist
				     'org-babel-load-languages)
				    'custom-type)))))))
  (while (pcomplete-here
	  '("-n" "-r" "-l"
	    ":cache" ":colnames" ":comments" ":dir" ":eval" ":exports"
	    ":file" ":hlines" ":no-expand" ":noweb" ":results" ":rownames"
	    ":session" ":shebang" ":tangle" ":var"))))

(defun pcomplete/org-mode/block-option/clocktable ()
  "Complete keywords in a clocktable line"
  (while (pcomplete-here '(":maxlevel" ":scope"
			   ":tstart" ":tend" ":block" ":step"
			   ":stepskip0" ":fileskip0"
			   ":emphasize" ":link" ":narrow" ":indent"
			   ":tcolumns" ":level" ":compact" ":timestamp"
			   ":formula" ":formatter"))))

(defun org-pcomplete-case-double (list)
  "Return list with both upcase and downcase version of all strings in LIST."
  (let (e res)
    (while (setq e (pop list))
      (setq res (cons (downcase e) (cons (upcase e) res))))
    (nreverse res)))

;;;; Finish up

(provide 'org-pcomplete)

;;; org-pcomplete.el ends here
debug log:

solving 7a4dc0d ...
found 7a4dc0d in https://git.savannah.gnu.org/cgit/emacs/org-mode.git

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