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 the
  22 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23 ;; Boston, MA 02111-1307, USA.
  24
  25 ;;; Commentary:
  26
  27 ;; This package provides equivalents of certain primitives from Gosling
  28 ;; Emacs (including the commercial UniPress versions).  These have an
  29 ;; ml- prefix to distinguish them from native GNU Emacs functions with
  30 ;; similar names.  The package mlconvert.el translates Mocklisp code
  31 ;; to use these names.
  32
  33 ;;; Code:
  34
  35 (defmacro ml-defun (&rest defs)
  36   (list 'ml-defun-1 (list 'quote defs)))
  37
  38 (defun ml-defun-1 (args)
  39   (while args
  40     (fset (car (car args)) (cons 'mocklisp (cdr (car args))))
  41     (setq args (cdr args))))
  42
  43 (defmacro declare-buffer-specific (&rest vars)
  44   (cons 'progn (mapcar (function (lambda (var) (list 'make-variable-buffer-local (list 'quote var)))) vars)))
  45
  46 (defun ml-set-default (varname value)
  47   (set-default (intern varname) value))
  48
  49 ; Lossage: must make various things default missing args to the prefix arg
  50 ; Alternatively, must make provide-prefix-argument do something hairy.
  51
  52 (defun >> (val count) (lsh val (- count)))
  53 (defun novalue () nil)
  54
  55 (defun ml-not (arg) (if (zerop arg) 1 0))
  56
  57 (defun provide-prefix-arg (arg form)
  58   (funcall (car form) arg))
  59
  60 (defun define-keymap (name)
  61   (fset (intern name) (make-keymap)))
  62
  63 ;; Make it work to use ml-use-...-map on "esc" and such.
  64 (fset 'esc-map esc-map)
  65 (fset 'ctl-x-map ctl-x-map)
  66
  67 (defun ml-use-local-map (name)
  68   (use-local-map (intern (concat name "-map"))))
  69
  70 (defun ml-use-global-map (name)
  71   (use-global-map (intern (concat name "-map"))))
  72
  73 (defun local-bind-to-key (name key)
  74   (or (current-local-map)
  75       (use-local-map (make-keymap)))
  76   (define-key (current-local-map)
  77     (if (integerp key)
  78         (if (>= key 128)
  79             (concat (char-to-string meta-prefix-char)
  80                     (char-to-string (- key 128)))
  81           (char-to-string key))
  82       key)
  83     (intern name)))
  84
  85 (defun bind-to-key (name key)
  86   (define-key global-map (if (integerp key) (char-to-string key) key)
  87     (intern name)))
  88
  89 (defun ml-autoload (name file)
  90   (autoload (intern name) file))
  91
  92 (defun ml-define-string-macro (name defn)
  93   (fset (intern name) defn))
  94
  95 (defun push-back-character (char)
  96   (setq unread-command-events (list char)))
  97
  98 (defun to-col (column)
  99   (indent-to column 0))
 100
 101 (defmacro is-bound (&rest syms)
 102   (cons 'and (mapcar (function (lambda (sym) (list 'boundp (list 'quote sym)))) syms)))
 103
 104 (defmacro declare-global (&rest syms)
 105   (cons 'progn (mapcar (function (lambda (sym) (list 'defvar sym nil))) syms)))
 106
 107 (defmacro error-occurred (&rest body)
 108   (list 'condition-case nil (cons 'progn (append body '(nil))) '(error t)))
 109
 110 (defun return-prefix-argument (value)
 111   (setq prefix-arg value))
 112
 113 (defun ml-prefix-argument ()
 114   (if (null current-prefix-arg) 1
 115     (if (listp current-prefix-arg) (car current-prefix-arg)
 116       (if (eq current-prefix-arg '-) -1
 117         current-prefix-arg))))
 118
 119 (defun ml-print (varname)
 120   (interactive "vPrint variable: ")
 121   (if (boundp varname)
 122     (message "%s => %s" (symbol-name varname) (symbol-value varname))
 123     (message "%s has no value" (symbol-name varname))))
 124
 125 (defun ml-set (str val) (set (intern str) val))
 126
 127 (defun ml-message (&rest args) (message "%s" (apply 'concat args)))
 128
 129 (defun kill-to-end-of-line ()
 130   (ml-prefix-argument-loop
 131     (if (eolp)
 132         (kill-region (point) (1+ (point)))
 133       (kill-region (point) (if (search-forward ?\n nil t)
 134                                (1- (point)) (point-max))))))
 135
 136 (defun set-auto-fill-hook (arg)
 137   (setq auto-fill-function (intern arg)))
 138
 139 (defun auto-execute (function pattern)
 140   (if (/= (aref pattern 0) ?*)
 141       (error "Only patterns starting with * supported in auto-execute"))
 142   (setq auto-mode-alist (cons (cons (concat "\\." (substring pattern 1)
 143                                             "\\'")
 144                                     function)
 145                               auto-mode-alist)))
 146
 147 (defun move-to-comment-column ()
 148   (indent-to comment-column))
 149
 150 (defun erase-region ()
 151   (delete-region (point) (mark)))
 152
 153 (defun delete-region-to-buffer (bufname)
 154   (copy-to-buffer bufname (point) (mark))
 155   (delete-region (point) (mark)))
 156
 157 (defun copy-region-to-buffer (bufname)
 158   (copy-to-buffer bufname (point) (mark)))
 159
 160 (defun append-region-to-buffer (bufname)
 161   (append-to-buffer bufname (point) (mark)))
 162
 163 (defun prepend-region-to-buffer (bufname)
 164   (prepend-to-buffer bufname (point) (mark)))
 165
 166 (defun delete-next-character ()
 167   (delete-char (ml-prefix-argument)))
 168
 169 (defun delete-next-word ()
 170   (delete-region (point) (progn (forward-word (ml-prefix-argument)) (point))))
 171
 172 (defun delete-previous-word ()
 173   (delete-region (point) (progn (backward-word (ml-prefix-argument)) (point))))
 174
 175 (defun delete-previous-character ()
 176   (delete-backward-char (ml-prefix-argument)))
 177
 178 (defun forward-character ()
 179   (forward-char (ml-prefix-argument)))
 180
 181 (defun backward-character ()
 182   (backward-char (ml-prefix-argument)))
 183
 184 (defun ml-newline ()
 185   (newline (ml-prefix-argument)))
 186
 187 (defun ml-next-line ()
 188   (next-line (ml-prefix-argument)))
 189
 190 (defun ml-previous-line ()
 191   (previous-line (ml-prefix-argument)))
 192
 193 (defun delete-to-kill-buffer ()
 194   (kill-region (point) (mark)))
 195
 196 (defun narrow-region ()
 197   (narrow-to-region (point) (mark)))
 198
 199 (defun ml-newline-and-indent ()
 200   (let ((column (current-indentation)))
 201     (newline (ml-prefix-argument))
 202     (indent-to column)))
 203
 204 (defun newline-and-backup ()
 205   (open-line (ml-prefix-argument)))
 206
 207 (defun quote-char ()
 208   (quoted-insert (ml-prefix-argument)))
 209
 210 (defun ml-current-column ()
 211   (1+ (current-column)))
 212
 213 (defun ml-current-indent ()
 214   (1+ (current-indentation)))
 215
 216 (defun region-around-match (&optional n)
 217   (set-mark (match-beginning n))
 218   (goto-char (match-end n)))
 219
 220 (defun region-to-string ()
 221   (buffer-substring (min (point) (mark)) (max (point) (mark))))
 222
 223 (defun use-abbrev-table (name)
 224   (let ((symbol (intern (concat name "-abbrev-table"))))
 225     (or (boundp symbol)
 226         (define-abbrev-table symbol nil))
 227     (symbol-value symbol)))
 228
 229 (defun define-hooked-local-abbrev (name exp hook)
 230   (define-local-abbrev name exp (intern hook)))
 231
 232 (defun define-hooked-global-abbrev (name exp hook)
 233   (define-global-abbrev name exp (intern hook)))
 234
 235 (defun case-word-lower ()
 236   (ml-casify-word 'downcase-region))
 237
 238 (defun case-word-upper ()
 239   (ml-casify-word 'upcase-region))
 240
 241 (defun case-word-capitalize ()
 242   (ml-casify-word 'capitalize-region))
 243
 244 (defun ml-casify-word (fun)
 245   (save-excursion
 246    (forward-char 1)
 247    (forward-word -1)
 248    (funcall fun (point)
 249             (progn (forward-word (ml-prefix-argument))
 250                    (point)))))
 251
 252 (defun case-region-lower ()
 253   (downcase-region (point) (mark)))
 254
 255 (defun case-region-upper ()
 256   (upcase-region (point) (mark)))
 257
 258 (defun case-region-capitalize ()
 259   (capitalize-region (point) (mark)))
 260 \f
 261 (defvar saved-command-line-args nil)
 262
 263 (defun argc ()
 264   (or saved-command-line-args
 265       (setq saved-command-line-args command-line-args
 266             command-line-args ()))
 267   (length command-line-args))
 268
 269 (defun argv (i)
 270   (or saved-command-line-args
 271       (setq saved-command-line-args command-line-args
 272             command-line-args ()))
 273   (nth i saved-command-line-args))
 274
 275 (defun invisible-argc ()
 276   (length (or saved-command-line-args
 277               command-line-args)))
 278
 279 (defun invisible-argv (i)
 280   (nth i (or saved-command-line-args
 281              command-line-args)))
 282
 283 (defun exit-emacs ()
 284   (interactive)
 285   (condition-case ()
 286       (exit-recursive-edit)
 287     (error (kill-emacs))))
 288 \f
 289 ;; Lisp function buffer-size returns total including invisible;
 290 ;; mocklisp wants just visible.
 291 (defun ml-buffer-size ()
 292   (- (point-max) (point-min)))
 293
 294 (defun previous-command ()
 295   last-command)
 296
 297 (defun beginning-of-window ()
 298   (goto-char (window-start)))
 299
 300 (defun end-of-window ()
 301   (goto-char (window-start))
 302   (vertical-motion (- (window-height) 2)))
 303 \f
 304 (defun ml-search-forward (string)
 305   (search-forward string nil nil (ml-prefix-argument)))
 306
 307 (defun ml-re-search-forward (string)
 308   (re-search-forward string nil nil (ml-prefix-argument)))
 309
 310 (defun ml-search-backward (string)
 311   (search-backward string nil nil (ml-prefix-argument)))
 312
 313 (defun ml-re-search-backward (string)
 314   (re-search-backward string nil nil (ml-prefix-argument)))
 315
 316 (defvar use-users-shell 1
 317   "Mocklisp compatibility variable; 1 means use shell from SHELL env var.
 318 0 means use /bin/sh.")
 319
 320 (defvar use-csh-option-f 1
 321   "Mocklisp compatibility variable; 1 means pass -f when calling csh.")
 322
 323 (defun filter-region (command)
 324   (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
 325         (csh (equal (file-name-nondirectory shell) "csh")))
 326     (call-process-region (point) (mark) shell t t nil
 327                          (if (and csh use-csh-option-f) "-cf" "-c")
 328                          (concat "exec " command))))
 329
 330 (defun execute-monitor-command (command)
 331   (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
 332         (csh (equal (file-name-nondirectory shell) "csh")))
 333     (call-process shell nil t t
 334                   (if (and csh use-csh-option-f) "-cf" "-c")
 335                   (concat "exec " command))))
 336 \f
 337 (defun use-syntax-table (name)
 338   (set-syntax-table (symbol-value (intern (concat name "-syntax-table")))))
 339
 340 (defun line-to-top-of-window ()
 341   (recenter (1- (ml-prefix-argument))))
 342
 343 (defun ml-previous-page (&optional arg)
 344   (let ((count (or arg (ml-prefix-argument))))
 345     (while (> count 0)
 346       (scroll-down nil)
 347       (setq count (1- count)))
 348     (while (< count 0)
 349       (scroll-up nil)
 350       (setq count (1+ count)))))
 351
 352 (defun ml-next-page ()
 353   (previous-page (- (ml-prefix-argument))))
 354
 355 (defun page-next-window (&optional arg)
 356   (let ((count (or arg (ml-prefix-argument))))
 357     (while (> count 0)
 358       (scroll-other-window nil)
 359       (setq count (1- count)))
 360     (while (< count 0)
 361       (scroll-other-window '-)
 362       (setq count (1+ count)))))
 363
 364 (defun ml-next-window ()
 365   (select-window (next-window)))
 366
 367 (defun ml-previous-window ()
 368   (select-window (previous-window)))
 369
 370 (defun scroll-one-line-up ()
 371   (scroll-up (ml-prefix-argument)))
 372
 373 (defun scroll-one-line-down ()
 374   (scroll-down (ml-prefix-argument)))
 375
 376 (defun split-current-window ()
 377   (split-window (selected-window)))
 378
 379 (defun last-key-struck () last-command-char)
 380
 381 (defun execute-mlisp-line (string)
 382   (eval (read string)))
 383
 384 (defun move-dot-to-x-y (x y)
 385   (goto-char (window-start (selected-window)))
 386   (vertical-motion (1- y))
 387   (move-to-column (1- x)))
 388
 389 (defun ml-modify-syntax-entry (string)
 390   (let ((i 5)
 391         (len (length string))
 392         (datastring (substring string 0 2)))
 393     (if (= (aref string 0) ?\-)
 394         (aset datastring 0 ?\ ))
 395     (if (= (aref string 2) ?\{)
 396         (if (= (aref string 4) ?\ )
 397             (aset datastring 0 ?\<)
 398           (error "Two-char comment delimiter: use modify-syntax-entry directly")))
 399     (if (= (aref string 3) ?\})
 400         (if (= (aref string 4) ?\ )
 401             (aset datastring 0 ?\>)
 402           (error "Two-char comment delimiter: use modify-syntax-entry directly")))
 403     (while (< i len)
 404       (modify-syntax-entry (aref string i) datastring)
 405       (setq i (1+ i))
 406       (if (and (< i len)
 407                (= (aref string i) ?\-))
 408           (let ((c (aref string (1- i)))
 409                 (lim (aref string (1+ i))))
 410             (while (<= c lim)
 411               (modify-syntax-entry c datastring)
 412               (setq c (1+ c)))
 413             (setq i (+ 2 i)))))))
 414 \f
 415
 416
 417 (defun ml-substr (string from to)
 418   (let ((length (length string)))
 419     (if (< from 0) (setq from (+ from length)))
 420     (if (< to 0) (setq to (+ to length)))
 421     (substring string from (+ from to))))
 422
 423 (defun ml-concat (&rest args)
 424   (let ((newargs nil) this)
 425     (while args
 426       (setq this (car args))
 427       (if (numberp this)
 428           (setq this (number-to-string this)))
 429       (setq newargs (cons this newargs)
 430             args (cdr args)))
 431     (apply 'concat (nreverse newargs))))
 432
 433 (provide 'mlsupport)
 434
 435 ;;; mlsupport.el ends here