lisp/emulation/mlsupport.el

   1 ;;; mlsupport.el --- run-time support for mocklisp code.
   2
   3 ;; Copyright (C) 1985 Free Software Foundation, Inc.
   4
   5 ;; Maintainer: FSF
   6 ;; Keywords: extensions
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software; you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation; either version 2, or (at your option)
  13 ;; any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs; see the file COPYING.  If not, write to
  22 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
  23
  24 ;;; Commentary:
  25
  26 ;; This package provides equivalents of certain primitives from Gosling
  27 ;; Emacs (including the commercial UniPress versions).  These have an
  28 ;; ml- prefix to distinguish them from native GNU Emacs functions with
  29 ;; similar names.  The oackage mlconvert.el translates Mocklisp code
  30 ;; to use these names.
  31
  32 ;;; Code:
  33
  34 (defmacro ml-defun (&rest defs)
  35   (list 'ml-defun-1 (list 'quote defs)))
  36
  37 (defun ml-defun-1 (args)
  38   (while args
  39     (fset (car (car args)) (cons 'mocklisp (cdr (car args))))
  40     (setq args (cdr args))))
  41
  42 (defmacro declare-buffer-specific (&rest vars)
  43   (cons 'progn (mapcar (function (lambda (var) (list 'make-variable-buffer-local (list 'quote var)))) vars)))
  44
  45 (defun ml-set-default (varname value)
  46   (set-default (intern varname) value))
  47
  48 ; Lossage: must make various things default missing args to the prefix arg
  49 ; Alternatively, must make provide-prefix-argument do something hairy.
  50
  51 (defun >> (val count) (lsh val (- count)))
  52 (defun novalue () nil)
  53
  54 (defun ml-not (arg) (if (zerop arg) 1 0))
  55
  56 (defun provide-prefix-arg (arg form)
  57   (funcall (car form) arg))
  58
  59 (defun define-keymap (name)
  60   (fset (intern name) (make-keymap)))
  61
  62 ;; Make it work to use ml-use-...-map on "esc" and such.
  63 (fset 'esc-map esc-map)
  64 (fset 'ctl-x-map ctl-x-map)
  65
  66 (defun ml-use-local-map (name)
  67   (use-local-map (intern (concat name "-map"))))
  68
  69 (defun ml-use-global-map (name)
  70   (use-global-map (intern (concat name "-map"))))
  71
  72 (defun local-bind-to-key (name key)
  73   (or (current-local-map)
  74       (use-local-map (make-keymap)))
  75   (define-key (current-local-map)
  76     (if (integerp key)
  77         (if (>= key 128)
  78             (concat (char-to-string meta-prefix-char)
  79                     (char-to-string (- key 128)))
  80           (char-to-string key))
  81       key)
  82     (intern name)))
  83
  84 (defun bind-to-key (name key)
  85   (define-key global-map (if (integerp key) (char-to-string key) key)
  86     (intern name)))
  87
  88 (defun ml-autoload (name file)
  89   (autoload (intern name) file))
  90
  91 (defun ml-define-string-macro (name defn)
  92   (fset (intern name) defn))
  93
  94 (defun push-back-character (char)
  95   (setq unread-command-events (list char)))
  96
  97 (defun to-col (column)
  98   (indent-to column 0))
  99
 100 (defmacro is-bound (&rest syms)
 101   (cons 'and (mapcar (function (lambda (sym) (list 'boundp (list 'quote sym)))) syms)))
 102
 103 (defmacro declare-global (&rest syms)
 104   (cons 'progn (mapcar (function (lambda (sym) (list 'defvar sym nil))) syms)))
 105
 106 (defmacro error-occurred (&rest body)
 107   (list 'condition-case nil (cons 'progn (append body '(nil))) '(error t)))
 108
 109 (defun return-prefix-argument (value)
 110   (setq prefix-arg value))
 111
 112 (defun ml-prefix-argument ()
 113   (if (null current-prefix-arg) 1
 114     (if (listp current-prefix-arg) (car current-prefix-arg)
 115       (if (eq current-prefix-arg '-) -1
 116         current-prefix-arg))))
 117
 118 (defun ml-print (varname)
 119   (interactive "vPrint variable: ")
 120   (if (boundp varname)
 121     (message "%s => %s" (symbol-name varname) (symbol-value varname))
 122     (message "%s has no value" (symbol-name varname))))
 123
 124 (defun ml-set (str val) (set (intern str) val))
 125
 126 (defun ml-message (&rest args) (message "%s" (apply 'concat args)))
 127
 128 (defun kill-to-end-of-line ()
 129   (ml-prefix-argument-loop
 130     (if (eolp)
 131         (kill-region (point) (1+ (point)))
 132       (kill-region (point) (if (search-forward ?\n nil t)
 133                                (1- (point)) (point-max))))))
 134
 135 (defun set-auto-fill-hook (arg)
 136   (setq auto-fill-function (intern arg)))
 137
 138 (defun auto-execute (function pattern)
 139   (if (/= (aref pattern 0) ?*)
 140       (error "Only patterns starting with * supported in auto-execute"))
 141   (setq auto-mode-alist (cons (cons (concat "\\." (substring pattern 1)
 142                                             "\\'")
 143                                     function)
 144                               auto-mode-alist)))
 145
 146 (defun move-to-comment-column ()
 147   (indent-to comment-column))
 148
 149 (defun erase-region ()
 150   (delete-region (point) (mark)))
 151
 152 (defun delete-region-to-buffer (bufname)
 153   (copy-to-buffer bufname (point) (mark))
 154   (delete-region (point) (mark)))
 155
 156 (defun copy-region-to-buffer (bufname)
 157   (copy-to-buffer bufname (point) (mark)))
 158
 159 (defun append-region-to-buffer (bufname)
 160   (append-to-buffer bufname (point) (mark)))
 161
 162 (defun prepend-region-to-buffer (bufname)
 163   (prepend-to-buffer bufname (point) (mark)))
 164
 165 (defun delete-next-character ()
 166   (delete-char (ml-prefix-argument)))
 167
 168 (defun delete-next-word ()
 169   (delete-region (point) (progn (forward-word (ml-prefix-argument)) (point))))
 170
 171 (defun delete-previous-word ()
 172   (delete-region (point) (progn (backward-word (ml-prefix-argument)) (point))))
 173
 174 (defun delete-previous-character ()
 175   (delete-backward-char (ml-prefix-argument)))
 176
 177 (defun forward-character ()
 178   (forward-char (ml-prefix-argument)))
 179
 180 (defun backward-character ()
 181   (backward-char (ml-prefix-argument)))
 182
 183 (defun ml-newline ()
 184   (newline (ml-prefix-argument)))
 185
 186 (defun ml-next-line ()
 187   (next-line (ml-prefix-argument)))
 188
 189 (defun ml-previous-line ()
 190   (previous-line (ml-prefix-argument)))
 191
 192 (defun delete-to-kill-buffer ()
 193   (kill-region (point) (mark)))
 194
 195 (defun narrow-region ()
 196   (narrow-to-region (point) (mark)))
 197
 198 (defun ml-newline-and-indent ()
 199   (let ((column (current-indentation)))
 200     (newline (ml-prefix-argument))
 201     (indent-to column)))
 202
 203 (defun newline-and-backup ()
 204   (open-line (ml-prefix-argument)))
 205
 206 (defun quote-char ()
 207   (quoted-insert (ml-prefix-argument)))
 208
 209 (defun ml-current-column ()
 210   (1+ (current-column)))
 211
 212 (defun ml-current-indent ()
 213   (1+ (current-indentation)))
 214
 215 (defun region-around-match (&optional n)
 216   (set-mark (match-beginning n))
 217   (goto-char (match-end n)))
 218
 219 (defun region-to-string ()
 220   (buffer-substring (min (point) (mark)) (max (point) (mark))))
 221
 222 (defun use-abbrev-table (name)
 223   (let ((symbol (intern (concat name "-abbrev-table"))))
 224     (or (boundp symbol)
 225         (define-abbrev-table symbol nil))
 226     (symbol-value symbol)))
 227
 228 (defun define-hooked-local-abbrev (name exp hook)
 229   (define-local-abbrev name exp (intern hook)))
 230
 231 (defun define-hooked-global-abbrev (name exp hook)
 232   (define-global-abbrev name exp (intern hook)))
 233
 234 (defun case-word-lower ()
 235   (ml-casify-word 'downcase-region))
 236
 237 (defun case-word-upper ()
 238   (ml-casify-word 'upcase-region))
 239
 240 (defun case-word-capitalize ()
 241   (ml-casify-word 'capitalize-region))
 242
 243 (defun ml-casify-word (fun)
 244   (save-excursion
 245    (forward-char 1)
 246    (forward-word -1)
 247    (funcall fun (point)
 248             (progn (forward-word (ml-prefix-argument))
 249                    (point)))))
 250
 251 (defun case-region-lower ()
 252   (downcase-region (point) (mark)))
 253
 254 (defun case-region-upper ()
 255   (upcase-region (point) (mark)))
 256
 257 (defun case-region-capitalize ()
 258   (capitalize-region (point) (mark)))
 259 \f
 260 (defvar saved-command-line-args nil)
 261
 262 (defun argc ()
 263   (or saved-command-line-args
 264       (setq saved-command-line-args command-line-args
 265             command-line-args ()))
 266   (length command-line-args))
 267
 268 (defun argv (i)
 269   (or saved-command-line-args
 270       (setq saved-command-line-args command-line-args
 271             command-line-args ()))
 272   (nth i saved-command-line-args))
 273
 274 (defun invisible-argc ()
 275   (length (or saved-command-line-args
 276               command-line-args)))
 277
 278 (defun invisible-argv (i)
 279   (nth i (or saved-command-line-args
 280              command-line-args)))
 281
 282 (defun exit-emacs ()
 283   (interactive)
 284   (condition-case ()
 285       (exit-recursive-edit)
 286     (error (kill-emacs))))
 287 \f
 288 ;; Lisp function buffer-size returns total including invisible;
 289 ;; mocklisp wants just visible.
 290 (defun ml-buffer-size ()
 291   (- (point-max) (point-min)))
 292
 293 (defun previous-command ()
 294   last-command)
 295
 296 (defun beginning-of-window ()
 297   (goto-char (window-start)))
 298
 299 (defun end-of-window ()
 300   (goto-char (window-start))
 301   (vertical-motion (- (window-height) 2)))
 302 \f
 303 (defun ml-search-forward (string)
 304   (search-forward string nil nil (ml-prefix-argument)))
 305
 306 (defun ml-re-search-forward (string)
 307   (re-search-forward string nil nil (ml-prefix-argument)))
 308
 309 (defun ml-search-backward (string)
 310   (search-backward string nil nil (ml-prefix-argument)))
 311
 312 (defun ml-re-search-backward (string)
 313   (re-search-backward string nil nil (ml-prefix-argument)))
 314
 315 (defvar use-users-shell 1
 316   "Mocklisp compatibility variable; 1 means use shell from SHELL env var.
 317 0 means use /bin/sh.")
 318
 319 (defvar use-csh-option-f 1
 320   "Mocklisp compatibility variable; 1 means pass -f when calling csh.")
 321
 322 (defun filter-region (command)
 323   (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
 324         (csh (equal (file-name-nondirectory shell) "csh")))
 325     (call-process-region (point) (mark) shell t t nil
 326                          (if (and csh use-csh-option-f) "-cf" "-c")
 327                          (concat "exec " command))))
 328
 329 (defun execute-monitor-command (command)
 330   (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
 331         (csh (equal (file-name-nondirectory shell) "csh")))
 332     (call-process shell nil t t
 333                   (if (and csh use-csh-option-f) "-cf" "-c")
 334                   (concat "exec " command))))
 335 \f
 336 (defun use-syntax-table (name)
 337   (set-syntax-table (symbol-value (intern (concat name "-syntax-table")))))
 338
 339 (defun line-to-top-of-window ()
 340   (recenter (1- (ml-prefix-argument))))
 341
 342 (defun ml-previous-page (&optional arg)
 343   (let ((count (or arg (ml-prefix-argument))))
 344     (while (> count 0)
 345       (scroll-down nil)
 346       (setq count (1- count)))
 347     (while (< count 0)
 348       (scroll-up nil)
 349       (setq count (1+ count)))))
 350
 351 (defun ml-next-page ()
 352   (previous-page (- (ml-prefix-argument))))
 353
 354 (defun page-next-window (&optional arg)
 355   (let ((count (or arg (ml-prefix-argument))))
 356     (while (> count 0)
 357       (scroll-other-window nil)
 358       (setq count (1- count)))
 359     (while (< count 0)
 360       (scroll-other-window '-)
 361       (setq count (1+ count)))))
 362
 363 (defun ml-next-window ()
 364   (select-window (next-window)))
 365
 366 (defun ml-previous-window ()
 367   (select-window (previous-window)))
 368
 369 (defun scroll-one-line-up ()
 370   (scroll-up (ml-prefix-argument)))
 371
 372 (defun scroll-one-line-down ()
 373   (scroll-down (ml-prefix-argument)))
 374
 375 (defun split-current-window ()
 376   (split-window (selected-window)))
 377
 378 (defun last-key-struck () last-command-char)
 379
 380 (defun execute-mlisp-line (string)
 381   (eval (read string)))
 382
 383 (defun move-dot-to-x-y (x y)
 384   (goto-char (window-start (selected-window)))
 385   (vertical-motion (1- y))
 386   (move-to-column (1- x)))
 387
 388 (defun ml-modify-syntax-entry (string)
 389   (let ((i 5)
 390         (len (length string))
 391         (datastring (substring string 0 2)))
 392     (if (= (aref string 0) ?\-)
 393         (aset datastring 0 ?\ ))
 394     (if (= (aref string 2) ?\{)
 395         (if (= (aref string 4) ?\ )
 396             (aset datastring 0 ?\<)
 397           (error "Two-char comment delimiter: use modify-syntax-entry directly")))
 398     (if (= (aref string 3) ?\})
 399         (if (= (aref string 4) ?\ )
 400             (aset datastring 0 ?\>)
 401           (error "Two-char comment delimiter: use modify-syntax-entry directly")))
 402     (while (< i len)
 403       (modify-syntax-entry (aref string i) datastring)
 404       (setq i (1+ i))
 405       (if (and (< i len)
 406                (= (aref string i) ?\-))
 407           (let ((c (aref string (1- i)))
 408                 (lim (aref string (1+ i))))
 409             (while (<= c lim)
 410               (modify-syntax-entry c datastring)
 411               (setq c (1+ c)))
 412             (setq i (+ 2 i)))))))
 413 \f
 414
 415
 416 (defun ml-substr (string from to)
 417   (let ((length (length string)))
 418     (if (< from 0) (setq from (+ from length)))
 419     (if (< to 0) (setq to (+ to length)))
 420     (substring string from (+ from to))))
 421
 422 (provide 'mlsupport)
 423
 424 ;;; mlsupport.el ends here