Initial revision

[bpt/emacs.git] / lisp / expand.el

;; expand.el --- minor mode to make abbreviations more usable.

;; Copyright (C) 1995, 1996 Free Software Foundation, Inc.

;; Author: Frederic Lepied <Frederic.Lepied@sugix.frmug.org>
;; Maintainer: Frederic Lepied <Frederic.Lepied@sugix.frmug.org>
;; Keywords: abbrev

;; 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, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:
;;
;; Purpose of this package:
;;   1. Expand abbreviations only when they are at the end of a line and not
;;   in a comment or in a string.
;;   2. Position the cursor after expansion to a place specified by advance.
;;   3. Indent the expanded region.
;;   4. If a list of points as been provided with the abbreviation definition,
;;   the functions expand-jump-to-previous-mark and expand-jump-to-next-mark
;;   moved from mark to mark.
;;
;; Installation:
;;   * store this file somewhere in your load-path and byte compile it.
;;   * put (require 'expand) in your .emacs or in site-start.el or generate
;; autoloads.
;;   * and according to the mode install your expansion table.
;;
;;   Look at the Sample: section for emacs-lisp, perl and c expand lists.
;; For example for c-mode, you could declare your abbrev table with :
;;
;; (defconst c-expand-list
;;   '(("if" "if () {\n \n} else {\n \n}" (5 10 21))
;;     ("ifn" "if () {}" (5 8))
;;     ("uns" "unsigned ")
;;     ("for" "for(; ; ) {\n\n}" (5 7 9 13))
;;     ("switch" "switch () {\n\n}" (9 13))
;;     ("case" "case :\n\nbreak;\n" (6 8 16))
;;     ("do" "do {\n\n} while ();" (6 16))
;;     ("while" "while () {\n\n}" (8 12))
;;     ("default" "default:\n\nbreak;" 10)
;;     ("main" "int\nmain(int argc, char * argv[])\n{\n\n}\n" 37))
;;   "Expansions for C mode")
;; 
;;   and enter Expand mode with the following hook :
;;
;; (add-hook 'c-mode-hook (function (lambda()
;; 				   (expand-add-abbrevs c-mode-abbrev-table c-expand-list)
;; 				   (expand-mode))))
;;
;;   you can also bind jump functions to some keys and init some post-process
;; hooks :
;;
;; (add-hook 'expand-mode-load-hook
;; 	  (function
;; 	   (lambda()
;; 	     (add-hook 'expand-expand-hook 'indent-according-to-mode)
;; 	     (add-hook 'expand-jump-hook 'indent-according-to-mode)
;; 	     (define-key expand-map '[(control tab)] 'expand-jump-to-next-mark)
;; 	     (define-key expand-map '[(control shift tab)] 'expand-jump-to-previous-mark))))
;;
;; Remarks:
;;
;;   Has been tested under emacs 19.28-19.34 and XEmacs 19.11.
;;   Many thanks to Heddy Boubaker <boubaker@cenatls.cena.dgac.fr>,
;;                  Jerome Santini <santini@chambord.univ-orleans.fr>,
;;                  Jari Aalto <jaalto@tre.tele.nokia.fi>.
;;
;;   Please send me a word to give me your feeling about this mode or
;; to explain me how you use it (your expansions table for example) using
;; the function expand-mode-submit-report.
\f
;; Expand mode is not a replacement for abbrev it is just a layer above it.

;;; Constants:

(defconst expand-mode-version "$Id: expand.el,v 1.13 1996/11/23 18:59:53 fred Exp $"
  "Version tag for expand.el.")

(defconst expand-mode-help-address "expand-help@sugix.frmug.org"
  "Email address to send requests, comments or bug reports.")

(defvar expand-mode nil
  "Status variable for Expand mode.")
(make-variable-buffer-local 'expand-mode)

(defvar expand-mode-name " Expand"
  "Name of mode displayed in the modeline for Expand mode.")

(defvar expand-mode-hook nil
  "Hooks run when Expand mode is enabled.")

(defvar expand-mode-load-hook nil
  "Hooks run when expand is loaded.")

(defvar expand-expand-hook nil
  "Hooks run when expansion is done.")

(defvar expand-jump-hook nil
  "Hooks run when jump to mark occurs.")

;;; Samples:

(define-skeleton expand-c-for-skeleton "For loop skeleton"
  "Loop var: "
  "for(" str _ @ "=0; " str @ "; " str @ ") {" \n
  @ _ \n
  "}" >
  )

(defconst expand-c-sample-expand-list
  '(("if" "if () {\n \n} else {\n \n}" (5 10 21))
    ("ifn" "if () {}" (5 8))
    ("uns" "unsigned ")
    ("for" expand-c-for-skeleton)
    ("switch" "switch () {\n\n}" (9 13))
    ("case" "case :\n\nbreak;\n" (6 8 16))
    ("do" "do {\n\n} while ();" (6 16))
    ("while" "while () {\n\n}" (8 12))
    ("default" "default:\n\nbreak;" 10)
    ("main" "int\nmain(int argc, char * argv[])\n{\n\n}\n" 37))
  "Expansions for C mode. See `expand-add-abbrevs'.")

;; lisp example from Jari Aalto <jaalto@tre.tele.nokia.fi>
(defconst expand-sample-lisp-mode-expand-list
  (list
   (list
    "defu"
    (concat
     "(defun   ()\n"
     "  \"\"\n"
     "  (interactive)\n"
     "  (let* (\n"
     "         )\n"
     "    \n"
     "    ))")
    (list 8 11 16 32 43 59))

   (list
    "defs"
    (concat
     "(defsubst   ()\n"
     "  \"\"\n"
     "  (interactive)\n"
     "  )")
    (list 11 14 19 23 39))

   (list
    "defm"
    (concat
     "(defmacro  ()\n"
     "  \"\"\n"
     "  (` \n"
     "    ))")
    (list 11 13 18 25))

   (list
    "defa"
    (concat
     "(defadvice   (around   act)\n"
     "  \"\"\n"
     "  \n"
     "  )")
    (list 12 22 32 36))

    (list
     "defc"
     "(defconst   nil\n  \"\")\n"
     (list 11 13 20))

    (list
     "defv"
     "(defvar   nil\n  \"\")\n"
     (list 9 11 18))

    (list
     "let"
     "(let* (\n)\n    "
     (list 8 13))

     (list
     "sav"
     "(save-excursion\n \n)"
     (list 18))

     (list
     "aut"
     "(autoload ' \"\" t t)\n"
     (list 12 14))

    )
   "Expansions for Lisp mode. See `expand-add-abbrevs'.")
 
;; perl example from Jari Aalto <jaalto@tre.tele.nokia.fi>
(defconst expand-sample-perl-mode-expand-list
  (list
   (list
    ;;   This is default perl4 subroutine template
    ;;
    "sub"
    (concat
     "#" (make-string 70 ?-) "\n"
     "sub   {\n"
     "    # DESCRIPTION\n"
     "    #   \n"
     "    #   \n"
     "    # INPUT\n"
     "    #   \n"
     "    #   \n"
     "    # RETURN\n"
     "    #   \n"
     "\n"
     "    local( $f ) = \"$lib.\";\n"   ;; Function name AFTER period
     "    local() = @_;\n"              ;; func arguments here
     "    \n"
     "    \n}\n"
     )
    (list 77 88 120 146 159 176))

   (list
    "for"                               ; foreach
    (concat
     "for (  )\n"
     "{\n\n\}"
     )
    (list 7 12))

   (list
    "whi"                               ; foreach
    (concat
     "while (  )\n"
     "{\n\n\}"
     )
    (list 9 15))


   ;;   The normal "if" can be used like
   ;;   print $F "xxxxxx"  if defined @arr;
   ;;
   (list
    "iff"
    (concat
     "if (  )\n"
     "{\n\n\}"
     )
    (list 6 12))

   (list "loc"  "local( $ );"   (list 9))
   (list "my"   "my( $ );"      (list 6))
   (list "ope"  "open(,\"\")\t|| die \"$f: Can't open [$]\";" (list 6 8 36))
   (list "clo"  "close ;"       7)
   (list "def"  "defined  "     (list 9))
   (list "und"  "undef ;"       (list 7))

   ;;   There is no ending colon, because they can be in statement
   ;;    defined $REXP_NOT_NEW && (print "xxxxx" );
   ;;
   (list "pr"  "print "         7)
   (list "pf"  "printf "        8)


   (list "gre"  "grep( //, );"  (list 8 11))
   (list "pus"  "push( , );"    (list 7 9))
   (list "joi"  "join( '', );"  (list 7 11))
   (list "rtu"  "return ;"      (list 8))

   )
  "Expansions for Perl mode. See `expand-add-abbrevs'.")

;;; Code:

;;;###autoload
(defun expand-mode(&optional arg)
  "Toggle Expand mode.
With argument ARG, turn Expand mode on if ARG is positive.
In Expand mode, inserting an abbreviation at the end of a line
causes it to expand and be replaced by its expansion."
  (interactive "P")
  (setq expand-mode (if (null arg) (not expand-mode)
		       (> (prefix-numeric-value arg) 0)))
  (if expand-mode
      (progn
	(setq abbrev-mode nil)
	(run-hooks 'expand-mode-hook))))

;;;###autoload
(defvar expand-map (make-sparse-keymap)
  "Key map used in Expand mode.")
(define-key expand-map " " 'expand-template-abbreviation)

(or (assq 'expand-mode minor-mode-alist)
    (setq minor-mode-alist (cons (list 'expand-mode expand-mode-name)
				 minor-mode-alist)))

(or (assq 'expand-mode minor-mode-map-alist)
    (setq minor-mode-map-alist (cons (cons 'expand-mode expand-map)
				     minor-mode-map-alist)))
 
;;;###autoload
(defun expand-add-abbrevs (table abbrevs)
  "Add a list of abbrev to the table.
Each abbrev description entry has the following format :
	(abbrev expansion arg)
where
      abbrev is the abbreviation to replace.
      expansion is the replacement string or a function which will make
the expansion. For example you could use the DMacros or skeleton packages
to generate such functions.
      arg is an optional  element which can be a  number or a  list of
numbers. If arg is a  number, the cursor will be  placed at arg  chars
from  the beginning of  the expanded text.   If expansion is a list of
numbers the cursor will be placed according to the first number of the
list from the beginning of the expanded text and  marks will be placed
and you  will  be able to  visit  them  cyclicaly  with the  functions
expand-jump-to-previous-mark  and expand-jump-to-next-mark. If arg  is
omitted, the cursor will be placed at the end of the expanded text."
  (if (null abbrevs)
      table
    (expand-add-abbrev table (nth 0 (car abbrevs)) (nth 1 (car abbrevs))
		       (nth 2 (car abbrevs)))
    (expand-add-abbrevs table (cdr abbrevs))))

(defvar expand-list nil "Temporary variable used by Expand mode.")

(defvar expand-pos nil
  "If non nil, stores a vector containing markers to positions defined by the last expansion.
This variable is local to a buffer.")
(make-variable-buffer-local 'expand-pos)

(defvar expand-index 0
  "Index of the last marker used in expand-pos.
This variable is local to a buffer.")
(make-variable-buffer-local 'expand-index)

(defvar expand-point nil
  "End of the expanded region.
This variable is local to a buffer.")
(make-variable-buffer-local 'expand-point)

(defun expand-add-abbrev (table abbrev expansion arg)
  "Add one abbreviation and provide the hook to move to the specified positions."
  (let* ((string-exp (if (and (symbolp expansion) (fboundp expansion))
			 nil
		       expansion))
         (position   (if (and arg string-exp)
			 (if (listp arg)
			     (- (length expansion) (1- (car arg)))
			   (- (length expansion) (1- arg)))
		       0)))
    (define-abbrev
      table
      abbrev
      (vector string-exp
	      position
	      (if (and (listp arg)
		       (not (null arg)))
		  (cons (length string-exp) arg)
		nil)
	      (if (and (symbolp expansion) (fboundp expansion))
		  expansion
		nil)
	      )
      'expand-abbrev-hook)))

;;;###autoload
(defun expand-template-abbreviation(arg)
  "Do the expansion job if we are at the end of a line or insert space."
  (interactive "p")
  (or (expand-try-to-expand)
      (self-insert-command arg)))

;; Try to expand an abbrev. On success check if it is an Expand mode abbrev
;; else undo the expansion.
(defun expand-try-to-expand()
  (if (not (expand-abbrev))
      nil
    (if (not (stringp (symbol-value last-abbrev)))
	t
      (unexpand-abbrev)
      nil)))

(defun expand-abbrev-hook()
  "Abbrev hook used to do the expansion job of expand abbrevs. See `expand-add-abbrevs'."
  ;; Expand only at the end of a line if we are near a word that has
  ;; an abbrev built from expand-add-abbrev.
  (if (and (eolp)
	   (not (expand-in-literal)))
      (let ((p (point)))
	(setq expand-point nil)
	;; don't expand if the preceding char isn't a word constituent
	(if (and (eq (char-syntax (preceding-char))
		     ?w)
		 (expand-do-expansion))
	    (progn
	      ;; expand-point tells us if we have inserted the text
	      ;; ourself or if it is the hook which has done the job.
	      (if expand-point
		  (progn
		    (if (vectorp expand-list)
			(expand-build-marks expand-point))
		    (indent-region p expand-point nil))
		;; an outside function can set expand-list to a list of
		;; markers in reverse order.
		(if (listp expand-list)
		    (setq expand-index 0
			  expand-pos (expand-list-to-markers expand-list)
			  expand-list nil)))
	      (run-hooks 'expand-expand-hook)
	      t))))
  )

(defun expand-do-expansion()
  (delete-backward-char (length last-abbrev-text))
  (let* ((vect (symbol-value last-abbrev))
	 (text (aref vect 0))
	 (position (aref vect 1))
	 (jump-args (aref vect 2))
	 (hook (aref vect 3)))
    (cond (text
	   (insert text)
	   (setq expand-point (point))))
    (if jump-args
	(funcall 'expand-build-list (car jump-args) (cdr jump-args)))
    (if position
	(backward-char position))
    (if hook
	(funcall hook))
    t)
  )

(defun expand-abbrev-from-expand(word)
  "Test if an abbrev has a hook."
  (or
   (and (intern-soft word local-abbrev-table)
	(symbol-function (intern-soft word local-abbrev-table)))
   (and (intern-soft word global-abbrev-table)
	(symbol-function (intern-soft word global-abbrev-table)))))

(defun expand-previous-word ()
  "Return the previous word."
  (save-excursion
    (let ((p (point)))
      (backward-word 1)
      (buffer-substring p (point)))))

(defun expand-jump-to-previous-mark()
  "Move the cursor to previous mark created by the expansion."
  (interactive)
  (if expand-pos
      (progn
	(setq expand-index (1- expand-index))
	(if (< expand-index 0)
	    (setq expand-index (1- (length expand-pos))))
	(goto-char (aref expand-pos expand-index))
	(run-hooks 'expand-jump-hook))))

(defun expand-jump-to-next-mark()
  "Move the cursor to next mark created by the expansion."
  (interactive)
  (if expand-pos
      (progn
	(setq expand-index (1+ expand-index))
	(if (>= expand-index (length expand-pos))
	    (setq expand-index 0))
	(goto-char (aref expand-pos expand-index))
	(run-hooks 'expand-jump-hook))))

(defun expand-build-list (len l)
  "Build a vector of offset positions from the list of positions."
  (expand-clear-markers)
  (setq expand-list (vconcat l))
  (let ((i 0)
	(lenlist (length expand-list)))
    (while (< i lenlist)
      (aset expand-list i (- len (1- (aref expand-list i))))
      (setq i (1+ i))))
  )

(defun expand-build-marks (p)
  "Transform the offsets vector into a marker vector."
  (if expand-list
      (progn
	(setq expand-index 0)
	(setq expand-pos (make-vector (length expand-list) nil))
	(let ((i (1- (length expand-list))))
	  (while (>= i 0)
	    (aset expand-pos i (copy-marker (- p (aref expand-list i))))
	    (setq i (1- i))))
	(setq expand-list nil))))

(defun expand-clear-markers ()
  "Make the markers point nowhere."
  (if expand-pos
      (progn
    (let ((i (1- (length expand-pos))))
      (while (>= i 0)
	(set-marker (aref expand-pos i) nil)
	(setq i (1- i))))
    (setq expand-pos nil))))

(defun expand-in-literal ()
  "Test if we are in a comment or in a string."
  (save-excursion
    (let* ((lim (or (save-excursion
		      (beginning-of-defun)
		      (point))
		    (point-min)))
	   (here (point))
	   (state (parse-partial-sexp lim (point))))
      (cond
       ((nth 3 state) 'string)
       ((nth 4 state) 'comment)
       (t nil)))))

(defun expand-mode-submit-report ()
  "Report a problem, a suggestion or a comment about Expand mode."
  (interactive)
  (require 'reporter)
  (reporter-submit-bug-report
   expand-mode-help-address
    (concat "expand.el " expand-mode-version)
    '(expand-mode-name
      expand-mode-hook
      expand-mode-load-hook
      expand-map
      )
    nil
    nil
    "Dear expand.el maintainer,"))

;; support functions to add marks to jump from outside function

(defun expand-list-to-markers (l)
  "Transform a list of markers in reverse order into a vector in the correct order."
  (let* ((len (1- (length l)))
	 (loop len)
	 (v (make-vector (+ len 1) nil)))
    (while (>= loop 0)
      (aset v loop (if (markerp (car l)) (car l) (copy-marker (car l))))
      (setq l (cdr l)
	    loop (1- loop)))
    v))

;; integration with skeleton.el
(defun expand-skeleton-end-hook ()
  "`skeleton-end-hook' to enable expand marks jumps for @ skeleton tags see `skeleton-insert'."
  (if skeleton-marks
      (setq expand-list skeleton-marks)))
  
(add-hook 'skeleton-end-hook (function expand-skeleton-end-hook))

(provide 'expand)

;; run load hooks
(run-hooks 'expand-mode-load-hook)

;;; expand.el ends here