home *** CD-ROM | disk | FTP | other *** search
- ;;; tempo.el --- templates with hotspots
- ;; Copyright (C) 1994 Free Software Foundation, Inc.
-
- ;; Author: David K}gedal <davidk@lysator.liu.se >
- ;; Created: 16 Feb 1994
- ;; Version: 1.1.1
- ;; 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-region nil
- "*Automatically insert current region when there is a `r' in the template
- If this variable is NIL, `r' elements will be treated just like `p'
- elements, unless the template function is given a prefix (or a non-nil
- argument). If this variable is non-NIL, the behaviour is reversed.")
-
- (defvar tempo-show-completion-buffer t
- "*If non-NIL, show a buffer with possible completions, when only
- a partial completion can be found")
-
- (defvar tempo-leave-completion-buffer nil
- "*If NIL, a completion buffer generated by \\[tempo-complete-tag]
- disappears at the next keypress; otherwise, it remains forever.")
-
- (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.")
-
- (defvar tempo-named-insertions nil
- "Temporary storage for named insertions")
-
- ;; 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 <NAME>) If `tempo-interactive' is non-nil, the user is
- prompted in the minbuffer with PROMPT for a string to be inserted.
- If the optional parameter NAME is non-nil, the text is saved for
- later insertion with the `s' tag.
- If `tempo-interactive is nil, it works like 'p.
- - (r PROMPT) like the previous, but if `tempo-interactive' is nil
- and `tempo-insert' is called with ON-REGION non-nil, the current
- region is placed here.
- - (s NAME) Inserts text previously read with the (p ..) construct.
- Finds the insertion saved under NAME and inserts it. Acts like 'p
- if tempo-interactive is nil.
- - '& 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)
- (list 'if 'tempo-insert-region
- (list 'not 'arg) '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-forget-insertions))
-
- ;;;
- ;;; 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))))
- ((and (consp element) (eq (car element) 's))
- (if tempo-interactive
- (tempo-insert-named (cdr element))
- (tempo-insert-mark (point-marker))))
- ((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-mark'.
-
- PROMPT is the prompt string or a list containing the prompt string and
- a name to save the inserted text under."
- (if tempo-interactive
- (let ((prompt-string (if (listp prompt)
- (car prompt)
- prompt))
- (save-name (and (listp prompt) (nth 1 prompt)))
- inserted-text)
-
- (progn
- (setq inserted-text (read-string prompt-string))
- (insert inserted-text)
- (if save-name
- (tempo-remember-insertion save-name inserted-text))))
- (tempo-insert-mark (point-marker))))
-
- ;;;
- ;;; tempo-remember-insertion
-
- (defun tempo-remember-insertion (save-name string)
- "Save the text in STRING under the name SAVE-NAME for later retrieval."
- (setq tempo-named-insertions (cons (cons save-name string)
- tempo-named-insertions)))
-
- ;;;
- ;;; tempo-forget-insertions
-
- (defun tempo-forget-insertions ()
- "Forget all the saved named insertions."
- (setq tempo-named-insertions nil))
-
- ;;;
- ;;; tempo-insert-named
-
- (defun tempo-insert-named (elt)
- "Insert the previous insertion saved under a named specified in ELT.
- The name is in the car of ELT."
- (let* ((name (car elt))
- (insertion (cdr (assq name tempo-named-insertions))))
- (if insertion
- (insert insertion)
- (error "Named insertion not found"))))
-
- ;;;
- ;;; 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.
-
- If tempo-show-completion-buffer is non-NIL, a buffer containing
- possible completions is displayed when a partial completion is found."
-
- ;; This function is really messy. Some cleaning up is necessary.
- (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 match-string
- tag-list))))
-
- (if compl ;any match
- (delete-region match-start (point)))
-
- (cond
- ((null compl) ; No match
- nil)
- ((symbolp compl) ; ??
- (tempo-insert-template compl nil)
- (throw 'completed t))
- ((eq compl t) ; Exact, sole match
- (tempo-insert-template (cdr (assoc match-string tag-list))
- nil)
- (throw 'completed t))
- ((stringp compl) ; (partial) completion found
- (let ((compl2 (assoc compl tag-list)))
- (if compl2
- (tempo-insert-template (cdr compl2) nil)
- (insert compl)
- (if t ;(string= match-string compl)
- (if tempo-show-completion-buffer
- (tempo-display-completions match-string
- tag-list)
- (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-display-completions
-
- (defun tempo-display-completions (string tag-list)
- "Show a buffer containing possible completions for STRING."
- (if tempo-leave-completion-buffer
- (with-output-to-temp-buffer "*Completions*"
- (display-completion-list
- (all-completions string tag-list)))
- (save-window-excursion
- (with-output-to-temp-buffer "*Completions*"
- (display-completion-list
- (all-completions string tag-list)))
- (sit-for 32767))))
-
- ;;; tempo.el ends here
-