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+;;; tempo.el --- templates with hotspots
+;; Copyright (C) 1994 Free Software Foundation, Inc.
+
+;; Author: David Kegedal <davidk@lysator.liu.se >
+;; Created: 16 Feb 1994
+;; Version: 1.0
+;; Keywords: extensions, languages, tools
+
+;; 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 2, 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; see the file COPYING.  If not, write to
+;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
+
+;;; Commentary:
+
+;; This file provides a simple way to define powerful templates, or
+;; macros, if you wish. It is mainly intended for, but not limited to,
+;; other programmers to be used for creating shortcuts for editing
+;; certain kind of documents. It was originally written to be used by
+;; a HTML editing mode written by Nelson Minar <nelson@reed.edu>, and
+;; his html-helper-mode.el is probably the best example of how to use
+;; this program.
+
+;; A template is defined as a list of items to be inserted in the
+;; current buffer at point. Some of the items can be simple strings,
+;; while other can control formatting or define special points of
+;; interest in the inserted text.
+
+;; If a template defines a "point of interest" that point is inserted
+;; in a buffer-local list of "points of interest" that the user can
+;; jump between with the commands `tempo-backward-mark' and
+;; `tempo-forward-mark'. If the template definer provides a prompt for
+;; the point, and the variable `tempo-interactive' is non-nil, the
+;; user will be prompted for a string to be inserted in the buffer,
+;; using the minibuffer.
+
+;; The template can also define one point to be replaced with the
+;; current region if the template command is called with a prefix (or
+;; a non-nil argument).
+
+;; More flexible templates can be created by including lisp symbols,
+;; which will be evaluated as variables, or lists, which will will be
+;; evaluated as lisp expressions.
+
+;; See the documentation for tempo-define-template for the different
+;; items that can be used to define a tempo template.
+
+;; One of the more powerful features of tempo templates are automatic
+;; completion. With every template can be assigned a special tag that
+;; should be recognized by `tempo-complete-tag' and expanded to the
+;; complete template. By default the tags are added to a global list
+;; of template tags, and are matched against the last word before
+;; point. But if you assign your tags to a specific list, you can also
+;; specify another method for matching text in the buffer against the
+;; tags. In the HTML mode, for instance, the tags are matched against
+;; the text between the last `<' and point.
+
+;; When defining a template named `foo', a symbol named
+;; `tempo-template-foo' will be created whose value as a variable will
+;; be the template definition, and its function value will be an
+;; interactive function that inserts the template at the point.
+
+;; Full documentation for tempo.el can be found on the World Wide Web
+;; at http://www.lysator.liu.se:7500/~davidk/tempo.html (not yet
+;; completed)
+
+;; The latest tempo.el distribution can be fetched from
+;; ftp.lysator.liu.se in the directory /pub/emacs
+
+;;; Code:
+
+(provide 'tempo)
+
+;;; Variables
+
+(defvar tempo-interactive nil
+  "*Prompt user for strings in templates.
+If this variable is non-nil, `tempo-insert' prompts the
+user for text to insert in the templates")
+
+(defvar tempo-insert-string-functions nil
+  "List of functions to run when inserting a string.
+Each function is called with a single arg, STRING."  )
+
+(defvar tempo-tags nil
+  "An association list with tags and corresponding templates")
+
+(defvar tempo-local-tags '((tempo-tags . nil))
+  "A list of locally installed tag completion lists.
+
+It is a association list where the car of every element is a symbol
+whose varable value is a template list. The cdr part, if non-nil, is a
+function or a regexp that defines the string to match. See the
+documentation for the function `tempo-complete-tag' for more info.
+
+`tempo-tags' is always in the last position in this list.")
+
+(defvar tempo-marks nil
+  "A list of marks to jump to with `\\[tempo-forward-mark]' and `\\[tempo-backward-mark]'.")
+
+(defvar tempo-default-match-finder "\\b\\([^\\b]*\\)\\="
+  "The default regexp used to find the string to match against the tags.")
+
+;; Make some variables local to every buffer
+
+(make-variable-buffer-local 'tempo-marks)
+(make-variable-buffer-local 'tempo-local-tags)
+
+;;; Functions
+
+;;
+;; tempo-define-template
+
+(defun tempo-define-template (name elements &optional tag documentation taglist)
+  "Define a template.
+This function creates a template variable `tempo-template-NAME' and an
+interactive function `tempo-template-NAME' that inserts the template
+at the point.  The created function is returned.
+
+NAME is a string that contains the name of the template, ELEMENTS is a
+list of elements in the template, TAG is the tag used for completion,
+DOCUMENTATION is the documentation string for the insertion command
+created, and TAGLIST (a symbol) is the tag list that TAG (if provided)
+should be added to).  If TAGLIST is nil and TAG is non-nil, TAG is
+added to `tempo-tags'
+
+The elements in ELEMENTS can be of several types:
+
+ - A string. It is sent to the hooks in `tempo-insert-string-functions',
+   and the result is inserted.
+ - The symbol 'p. This position is saved in `tempo-marks'.
+ - The symbol 'r. If `tempo-insert' is called with ON-REGION non-nil
+   the current region is placed here. Otherwise it works like 'p.
+ - (p . PROMPT) If `tempo-interactive' is non-nil, the user is
+   prompted in the minbuffer with PROMPT for a string to be inserted.
+   If `tempo-interactive is nil, it works like 'p.
+ - (r . PROMPT) like the previou, but if `tempo-interactive' is nil
+   and `tempo-insert' is called with ON-REGION non-nil, the current
+   region is placed here.
+ - '& If there is only whitespace between the line start and point,
+   nothing happens. Otherwise a newline is inserted.
+ - '% If there is only whitespace between point and end-of-line
+   nothing happens. Otherwise a newline is inserted.
+ - 'n inserts a newline.
+ - '> The line is indented using `indent-according-to-mode'. Note that
+   you often should place this item after the text you want on the
+   line.
+ - 'n> inserts a newline and indents line.
+ - nil. It is ignored.
+ - Anything else. It is evaluated and the result is parsed again."
+
+  (let* ((template-name (intern (concat "tempo-template-"
+				       name)))
+	 (command-name template-name))
+    (set template-name elements)
+    (fset command-name (list 'lambda (list '&optional 'arg)
+			     (or documentation 
+				 (concat "Insert a " name "."))
+			     (list 'interactive "*P")
+			     (list 'tempo-insert-template (list 'quote
+						       template-name)
+				   'arg)))
+    (and tag
+	 (tempo-add-tag tag template-name taglist))
+    command-name))
+
+;;;
+;;; tempo-insert-template
+
+(defun tempo-insert-template (template on-region)
+  "Insert a template.
+TEMPLATE is the template to be inserted.  If ON-REGION is non-nil the
+`r' elements are replaced with the current region."
+  (and on-region
+       (< (mark) (point))
+       (exchange-point-and-mark))
+  (save-excursion
+    (tempo-insert-mark (point-marker))
+    (mapcar 'tempo-insert 
+	    (symbol-value template))
+    (tempo-insert-mark (point-marker)))
+  (tempo-forward-mark))
+
+;;;
+;;; tempo-insert
+
+(defun tempo-insert (element) 
+  "Insert a template element.
+Insert one element from a template. See documentation for
+`tempo-define-template' for the kind of elements possible."
+  (cond ((stringp element) (tempo-process-and-insert-string element))
+	((and (consp element) (eq (car element) 'p))
+	 (tempo-insert-prompt (cdr element)))
+	((and (consp element) (eq (car element) 'r))
+	 (if on-region
+	     (exchange-point-and-mark)
+	   (tempo-insert-prompt (cdr element))))
+	((eq element 'p) (tempo-insert-mark (point-marker)))
+	((eq element 'r) (if on-region
+			     (exchange-point-and-mark)
+			   (tempo-insert-mark (point-marker))))
+	((eq element '>) (indent-according-to-mode))
+	((eq element '&) (if (not (or (= (current-column) 0)
+				      (save-excursion
+					(re-search-backward
+					 "^\\s-*\\=" nil t))))
+			     (insert "\n")))
+	((eq element '%) (if (not (or (eolp)
+				      (save-excursion
+					(re-search-forward
+					 "\\=\\s-*$" nil t))))
+			     (insert "\n")))
+	((eq element 'n) (insert "\n"))
+	((eq element 'n>) (insert "\n") (indent-according-to-mode))
+	((null element))
+	(t (tempo-insert (eval element)))))
+
+;;;
+;;; tempo-insert-prompt
+
+(defun tempo-insert-prompt (prompt)
+  "Prompt for a text string and insert it in the current buffer.
+If the variable `tempo-interactive' is non-nil the user is prompted
+for a string in the minibuffer, which is then inserted in the current
+buffer. If `tempo-interactive' is nil, the current point is placed on
+`tempo-forward-mark-list'.
+
+PROMPT is the prompt string."
+  (if tempo-interactive
+      (insert (read-string prompt))
+    (tempo-insert-mark (point-marker))))
+
+;;;
+;;; tempo-process-and-insert-string
+
+(defun tempo-process-and-insert-string (string)
+  "Insert a string from a template.
+Run a string through the preprocessors in `tempo-insert-string-functions'
+and insert the results."
+
+  (cond ((null tempo-insert-string-functions)
+	 nil)
+	((symbolp tempo-insert-string-functions)
+	 (setq string
+	       (apply tempo-insert-string-functions (list string))))
+	((listp tempo-insert-string-functions)
+	 (mapcar (function (lambda (fn)
+			     (setq string (apply fn string))))
+		 tempo-insert-string-functions))
+	(t
+	 (error "Bogus value in tempo-insert-string-functions: %s"
+		tempo-insert-string-functions)))
+  (insert string))
+
+;;;
+;;; tempo-insert-mark
+
+(defun tempo-insert-mark (mark)
+  "Insert a mark `tempo-marks' while keeping it sorted"
+  (cond ((null tempo-marks) (setq tempo-marks (list mark)))
+	((< mark (car tempo-marks)) (setq tempo-marks (cons mark tempo-marks)))
+	(t (let ((lp tempo-marks))
+	     (while (and (cdr lp)
+			 (<= (car (cdr lp)) mark))
+	       (setq lp (cdr lp)))
+	     (if (not (= mark (car lp)))
+		 (setcdr lp (cons mark (cdr lp))))))))
+	  
+;;;
+;;; tempo-forward-mark
+
+(defun tempo-forward-mark ()
+  "Jump to the next mark in `tempo-forward-mark-list'."
+  (interactive)
+  (let ((next-mark (catch 'found
+		     (mapcar
+		      (function
+		       (lambda (mark)
+			 (if (< (point) mark)
+			     (throw 'found mark))))
+		      tempo-marks)
+		     ;; return nil if not found
+		     nil)))
+    (if next-mark
+	(goto-char next-mark))))
+
+;;;
+;;; tempo-backward-mark
+
+(defun tempo-backward-mark ()
+  "Jump to the previous mark in `tempo-back-mark-list'."
+  (interactive)
+  (let ((prev-mark (catch 'found
+		     (let (last)
+		       (mapcar
+			(function
+			 (lambda (mark)
+			   (if (<= (point) mark)
+			       (throw 'found last))
+			   (setq last mark)))
+			tempo-marks)
+		       last))))
+    (if prev-mark
+	(goto-char prev-mark))))
+	
+;;;
+;;; tempo-add-tag
+
+(defun tempo-add-tag (tag template &optional tag-list)
+  "Add a template tag.
+
+Add the TAG, that should complete to TEMPLATE to the list in TAG-LIST,
+or to `tempo-tags' if TAG-LIST is nil."
+
+  (interactive "sTag: \nCTemplate: ")
+  (if (null tag-list)
+      (setq tag-list 'tempo-tags))
+  (if (not (assoc tag (symbol-value tag-list)))
+      (set tag-list (cons (cons tag template) (symbol-value tag-list)))))
+
+;;;
+;;; tempo-use-tag-list
+
+(defun tempo-use-tag-list (tag-list &optional completion-function)
+  "Install TAG-LIST to be used for template completion in the current buffer.
+
+TAG-LIST is a symbol whose variable value is a tag list created with
+`tempo-add-tag' and COMPLETION-FUNCTION is an optional function or
+string that is used by `\\[tempo-complete-tag]' to find a string to
+match the tag against.
+
+If COMPLETION-FUNCTION is a string, it should contain a regular
+expression with at least one \\( \\) pair. When searching for tags,
+`tempo-complete-tag' calls `re-search-backward' with this string, and
+the string between the first \\( and \\) is used for matching against
+each string in the tag list. If one is found, the whole text between
+the first \\( and the point is replaced with the inserted template.
+
+You will probably want to include \\ \= at the end of the regexp to make
+sure that the string is matched only against text adjacent to the
+point.
+
+If COPMLETION-FUNCTION is a symbol, it should be a function that
+returns a cons cell of the form (STRING . POS), where STRING is the
+string used for matching and POS is the buffer position after which
+text should be replaced with a template."
+
+  (let ((old (assq tag-list tempo-local-tags)))
+    (if old
+	(setcdr old completion-function)
+      (setq tempo-local-tags (cons (cons tag-list completion-function)
+				   tempo-local-tags)))))
+
+;;;
+;;; tempo-find-match-string
+
+(defun tempo-find-match-string (finder)
+  "Find a string to be matched against a tag list.
+
+FINDER is a function or a string. Returns (STRING . POS)."
+  (cond ((stringp finder)
+	 (save-excursion
+	   (re-search-backward finder nil t))
+	 (cons (buffer-substring (match-beginning 1) (1+ (match-end 1)))
+	       (match-beginning 1)))
+	(t
+	 (funcall finder))))
+
+;;;
+;;; tempo-complete-tag
+
+(defun tempo-complete-tag (&optional silent)
+  "Look for a tag and expand it..
+
+It goes through the tag lists in `tempo-local-tags' (this includes
+`tempo-tags') and for each list it uses the corresponding match-finder
+function, or `tempo-default-match-finder' if none is given, and tries
+to match the match string against the tags in the list using
+`try-completion'. If none is found it proceeds to the next list until
+one is found. If a partial completion is found, it is replaced by the
+template if it can be completed uniquely, or completed as far as
+possible.
+
+When doing partial completion, only tags in the currently examined
+list are considered, so if you provide similar tags in different lists
+in `tempo-local-tags', the result may not be desirable.
+
+If no match is found or a partial match is found, and SILENT is
+non-nil, the function will give a signal."
+
+  (interactive)
+  (if (catch 'completed
+	(mapcar
+	 (function
+	  (lambda (tag-list-a)
+	    (let* ((tag-list (symbol-value(car tag-list-a)))
+		   (match-string-finder (or (cdr tag-list-a)
+					    tempo-default-match-finder))
+		   (match-info (tempo-find-match-string match-string-finder))
+		   (match-string (car match-info))
+		   (match-start (cdr match-info))
+		   (compl (or (cdr (assoc match-string tag-list))
+			      (try-completion (car match-info)
+					      tag-list))))
+	
+	      (if compl			;any match
+		  (delete-region match-start (point)))
+
+	      (cond
+	       ((null compl)
+		nil)
+	       ((symbolp compl)
+		(tempo-insert-template compl nil)
+		(throw 'completed t))
+	       ((eq compl t)
+		(tempo-insert-template (cdr (assoc match-string tag-list))
+				       nil)
+		(throw 'completed t))
+	       ((stringp compl)
+		(let ((compl2 (assoc compl tag-list)))
+		  (if compl2
+		      (tempo-insert-template (cdr compl2) nil)
+		    (insert compl)
+		    (if (string= match-string compl)
+			(if (not silent)
+			    (ding)))))
+		(throw 'completed t))))))
+	 tempo-local-tags)
+	;; No completion found. Return nil
+	nil)
+      ;; Do nothing if a completion was found
+      t
+    ;; No completion was found
+    (if (not silent)
+	(ding))
+    nil))
+
+;;; tempo.el ends here