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+;;; org-tempo.el --- Template expansion for Org structures -*- lexical-binding: t; -*-
+
+;; Copyright (C) 2017-2021 Free Software Foundation, Inc.
+;;
+;; Author: Rasmus Pank Roulund <emacs at pank dot eu>
+;; Keywords: outlines, hypermedia, calendar, wp
+;; Homepage: https://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 <https://www.gnu.org/licenses/>.
+;;
+;;; Commentary:
+;;
+;; Org Tempo reimplements completions of structure template before
+;; point like `org-try-structure-completion' in Org v9.1 and earlier.
+;; For example, strings like "<e" at the beginning of the line will be
+;; expanded to an example block.
+;;
+;; All blocks defined in `org-structure-template-alist' are added as
+;; Org Tempo shortcuts, in addition to keywords defined in
+;; `org-tempo-keywords-alist'.
+;;
+;; `tempo' can also be used to define more sophisticated keywords
+;; completions.  See the section "Additional keywords" below for
+;; examples.
+;;
+;;; Code:
+
+(require 'tempo)
+(require 'cl-lib)
+(require 'org)
+
+(defvar org-structure-template-alist)
+
+
+(defgroup org-tempo nil
+  "Template expansion of Org structures."
+  :tag "Org structure"
+  :group 'org)
+
+(defvar org-tempo-tags nil
+  "Tempo tags for Org mode.")
+
+(defcustom org-tempo-keywords-alist
+  '(("L" . "latex")
+    ("H" . "html")
+    ("A" . "ascii")
+    ("i" . "index"))
+  "Keyword completion elements.
+
+This is an alist of KEY characters and corresponding KEYWORDS,
+just like `org-structure-template-alist'.  The tempo snippet
+\"<KEY\" will be expanded using the KEYWORD value.  For example
+\"<L\" at the beginning of a line is expanded to \"#+latex:\".
+
+Do not use \"I\" as a KEY, as it is reserved for expanding
+\"#+include\"."
+  :group 'org-tempo
+  :type '(repeat (cons (string :tag "Key")
+		       (string :tag "Keyword")))
+  :package-version '(Org . "9.2"))
+
+
+
+;;; Org Tempo functions and setup.
+
+(defun org-tempo-setup ()
+  "Setup tempo tags and match finder for the current buffer."
+  (org-tempo--update-maybe)
+  (tempo-use-tag-list 'org-tempo-tags)
+  (setq-local tempo-match-finder "^ *\\(<[[:word:]]+\\)\\="))
+
+(defun org-tempo--keys ()
+  "Return a list of all Org Tempo expansion strings, like \"<s\"."
+  (mapcar (lambda (pair) (format "<%s" (car pair)))
+	  (append org-structure-template-alist
+		  org-tempo-keywords-alist)))
+
+(defun org-tempo--update-maybe ()
+  "Check and add new Org Tempo templates if necessary.
+In particular, if new entries were added to
+`org-structure-template-alist' or `org-tempo-keywords-alist', new
+Tempo templates will be added."
+  (unless (cl-every (lambda (key) (assoc key org-tempo-tags))
+		    (org-tempo--keys))
+    (org-tempo-add-templates)))
+
+(defun org-tempo-add-templates ()
+  "Update all Org Tempo templates.
+
+Go through `org-structure-template-alist' and
+`org-tempo-keywords-alist' and update tempo templates."
+  (mapc 'org--check-org-structure-template-alist '(org-structure-template-alist
+						   org-tempo-keywords-alist))
+  (let ((keys (org-tempo--keys)))
+    ;; Check for duplicated snippet keys and warn if any are found.
+    (when (> (length keys) (length (delete-dups keys)))
+      (warn
+       "Duplicated keys in `org-structure-template-alist' and `org-tempo-keywords-alist'"))
+    ;; Remove any keys already defined in case they have been updated.
+    (setq org-tempo-tags
+	  (cl-remove-if (lambda (tag) (member (car tag) keys)) org-tempo-tags))
+    (mapc #'org-tempo-add-block org-structure-template-alist)
+    (mapc #'org-tempo-add-keyword org-tempo-keywords-alist)))
+
+(defun org-tempo-add-block (entry)
+  "Add block entry from `org-structure-template-alist'."
+  (let* ((key (format "<%s" (car entry)))
+	 (name (cdr entry))
+	 (special (member name '("src" "export"))))
+    (tempo-define-template (format "org-%s" (replace-regexp-in-string " " "-" name))
+			   `(,(format "#+begin_%s%s" name (if special " " ""))
+			     ,(when special 'p) '> n ,(unless special 'p) n
+			     ,(format "#+end_%s" (car (split-string name " ")))
+			     >)
+			   key
+			   (format "Insert a %s block" name)
+			   'org-tempo-tags)))
+
+(defun org-tempo-add-keyword (entry)
+  "Add keyword entry from `org-tempo-keywords-alist'."
+  (let* ((key (format "<%s" (car entry)))
+	 (name (cdr entry)))
+    (tempo-define-template (format "org-%s" (replace-regexp-in-string " " "-" name))
+			   `(,(format "#+%s: " name) p '>)
+			   key
+			   (format "Insert a %s keyword" name)
+			   'org-tempo-tags)))
+
+(defun org-tempo-complete-tag (&rest _)
+  "Look for a tag and expand it silently.
+Unlike to `tempo-complete-tag', do not give a signal if a partial
+completion or no match at all is found.  Return nil if expansion
+didn't succeed."
+  (org-tempo--update-maybe)
+  ;; `tempo-complete-tag' returns its SILENT argument when there is no
+  ;; completion available at all.
+  (not (eq 'fail (tempo-complete-tag 'fail))))
+
+
+;;; Additional keywords
+
+(defun org-tempo--include-file ()
+  "Add #+include: and a file name."
+  (let ((inhibit-quit t))
+    (unless (with-local-quit
+	      (prog1 t
+		(insert
+		 (format "#+include: %S "
+			 (file-relative-name
+			  (read-file-name "Include file: "))))))
+      (insert "<I")
+      (setq quit-flag nil))))
+
+(tempo-define-template "org-include"
+		       '((org-tempo--include-file)
+			 p >)
+		       "<I"
+		       "Include keyword"
+		       'org-tempo-tags)
+
+;;; Setup of Org Tempo
+;;
+;; Org Tempo is set up with each new Org buffer and potentially in the
+;; current Org buffer.
+
+(add-hook 'org-mode-hook 'org-tempo-setup)
+(add-hook 'org-tab-before-tab-emulation-hook 'org-tempo-complete-tag)
+
+;; Enable Org Tempo in all open Org buffers.
+(dolist (b (org-buffer-list 'files))
+  (with-current-buffer b (org-tempo-setup)))
+
+(provide 'org-tempo)
+
+;;; org-tempo.el ends here