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+;; Run-time support for mocklisp code.
+;; Copyright (C) 1985 Free Software Foundation, Inc.
+
+;; 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 1, 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.
+
+
+(provide 'mlsupport)
+
+(defmacro ml-defun (&rest defs)
+  (list 'ml-defun-1 (list 'quote defs)))
+
+(defun ml-defun-1 (args)
+  (while args
+    (fset (car (car args)) (cons 'mocklisp (cdr (car args))))
+    (setq args (cdr args))))
+
+(defmacro declare-buffer-specific (&rest vars)
+  (cons 'progn (mapcar (function (lambda (var) (list 'make-variable-buffer-local (list 'quote var)))) vars)))
+
+(defun ml-set-default (varname value)
+  (set-default (intern varname) value))
+
+; Lossage: must make various things default missing args to the prefix arg
+; Alternatively, must make provide-prefix-argument do something hairy.
+
+(defun >> (val count) (lsh val (- count)))
+(defun novalue () nil)
+
+(defun ml-not (arg) (if (zerop arg) 1 0))
+
+(defun provide-prefix-arg (arg form)
+  (funcall (car form) arg))
+
+(defun define-keymap (name)
+  (fset (intern name) (make-keymap)))
+
+(defun ml-use-local-map (name)
+  (use-local-map (intern (concat name "-map"))))
+
+(defun ml-use-global-map (name)
+  (use-global-map (intern (concat name "-map"))))
+
+(defun local-bind-to-key (name key)
+  (or (current-local-map)
+      (use-local-map (make-keymap)))
+  (define-key (current-local-map)
+    (if (integerp key)
+        (if (>= key 128)
+            (concat (char-to-string meta-prefix-char)
+                    (char-to-string (- key 128)))
+          (char-to-string key))
+      key)
+    (intern name)))
+
+(defun bind-to-key (name key)
+  (define-key global-map (if (integerp key) (char-to-string key) key)
+    (intern name)))
+
+(defun ml-autoload (name file)
+  (autoload (intern name) file))
+
+(defun ml-define-string-macro (name defn)
+  (fset (intern name) defn))
+
+(defun push-back-character (char)
+  (setq unread-command-char char))
+
+(defun to-col (column)
+  (indent-to column 0))
+
+(defmacro is-bound (&rest syms)
+  (cons 'and (mapcar (function (lambda (sym) (list 'boundp (list 'quote sym)))) syms)))
+
+(defmacro declare-global (&rest syms)
+  (cons 'progn (mapcar (function (lambda (sym) (list 'defvar sym nil))) syms)))
+
+(defmacro error-occurred (&rest body)
+  (list 'condition-case nil (cons 'progn (append body '(nil))) '(error t)))
+
+(defun return-prefix-argument (value)
+  (setq prefix-arg value))
+
+(defun ml-prefix-argument ()
+  (if (null current-prefix-arg) 1
+    (if (listp current-prefix-arg) (car current-prefix-arg)
+      (if (eq current-prefix-arg '-) -1
+        current-prefix-arg))))
+
+(defun ml-print (varname)
+  (interactive "vPrint variable: ")
+  (if (boundp varname)
+    (message "%s => %s" (symbol-name varname) (symbol-value varname))
+    (message "%s has no value" (symbol-name varname))))
+
+(defun ml-set (str val) (set (intern str) val))
+
+(defun ml-message (&rest args) (message "%s" (apply 'concat args)))
+
+(defun kill-to-end-of-line ()
+  (ml-prefix-argument-loop
+    (if (eolp)
+        (kill-region (point) (1+ (point)))
+      (kill-region (point) (if (search-forward ?\n nil t)
+                               (1- (point)) (point-max))))))
+
+(defun set-auto-fill-hook (arg)
+  (setq auto-fill-function (intern arg)))
+
+(defun auto-execute (function pattern)
+  (if (/= (aref pattern 0) ?*)
+      (error "Only patterns starting with * supported in auto-execute"))
+  (setq auto-mode-alist (cons (cons (concat "\\." (substring pattern 1)
+                                            "$")
+                                    function)
+                              auto-mode-alist)))
+
+(defun move-to-comment-column ()
+  (indent-to comment-column))
+
+(defun erase-region ()
+  (delete-region (point) (mark)))
+
+(defun delete-region-to-buffer (bufname)
+  (copy-to-buffer bufname (point) (mark))
+  (delete-region (point) (mark)))
+
+(defun copy-region-to-buffer (bufname)
+  (copy-to-buffer bufname (point) (mark)))
+
+(defun append-region-to-buffer (bufname)
+  (append-to-buffer bufname (point) (mark)))
+
+(defun prepend-region-to-buffer (bufname)
+  (prepend-to-buffer bufname (point) (mark)))
+
+(defun delete-next-character ()
+  (delete-char (ml-prefix-argument)))
+
+(defun delete-next-word ()
+  (delete-region (point) (progn (forward-word (ml-prefix-argument)) (point))))
+
+(defun delete-previous-word ()
+  (delete-region (point) (progn (backward-word (ml-prefix-argument)) (point))))
+
+(defun delete-previous-character ()
+  (delete-backward-char (ml-prefix-argument)))
+
+(defun forward-character ()
+  (forward-char (ml-prefix-argument)))
+
+(defun backward-character ()
+  (backward-char (ml-prefix-argument)))
+
+(defun ml-newline ()
+  (newline (ml-prefix-argument)))
+
+(defun ml-next-line ()
+  (next-line (ml-prefix-argument)))
+
+(defun ml-previous-line ()
+  (previous-line (ml-prefix-argument)))
+
+(defun delete-to-kill-buffer ()
+  (kill-region (point) (mark)))
+
+(defun narrow-region ()
+  (narrow-to-region (point) (mark)))
+
+(defun ml-newline-and-indent ()
+  (let ((column (current-indentation)))
+    (newline (ml-prefix-argument))
+    (indent-to column)))
+
+(defun newline-and-backup ()
+  (open-line (ml-prefix-argument)))
+
+(defun quote-char ()
+  (quoted-insert (ml-prefix-argument)))
+
+(defun ml-current-column ()
+  (1+ (current-column)))
+
+(defun ml-current-indent ()
+  (1+ (current-indentation)))
+
+(defun region-around-match (&optional n)
+  (set-mark (match-beginning n))
+  (goto-char (match-end n)))
+
+(defun region-to-string ()
+  (buffer-substring (min (point) (mark)) (max (point) (mark))))
+
+(defun use-abbrev-table (name)
+  (let ((symbol (intern (concat name "-abbrev-table"))))
+    (or (boundp symbol)
+        (define-abbrev-table symbol nil))
+    (symbol-value symbol)))
+
+(defun define-hooked-local-abbrev (name exp hook)
+  (define-local-abbrev name exp (intern hook)))
+
+(defun define-hooked-global-abbrev (name exp hook)
+  (define-global-abbrev name exp (intern hook)))
+
+(defun case-word-lower ()
+  (ml-casify-word 'downcase-region))
+
+(defun case-word-upper ()
+  (ml-casify-word 'upcase-region))
+
+(defun case-word-capitalize ()
+  (ml-casify-word 'capitalize-region))
+
+(defun ml-casify-word (fun)
+  (save-excursion
+   (forward-char 1)
+   (forward-word -1)
+   (funcall fun (point)
+            (progn (forward-word (ml-prefix-argument))
+                   (point)))))
+
+(defun case-region-lower ()
+  (downcase-region (point) (mark)))
+
+(defun case-region-upper ()
+  (upcase-region (point) (mark)))
+
+(defun case-region-capitalize ()
+  (capitalize-region (point) (mark)))
+
+(defvar saved-command-line-args nil)
+
+(defun argc ()
+  (or saved-command-line-args
+      (setq saved-command-line-args command-line-args
+            command-line-args ()))
+  (length command-line-args))
+
+(defun argv (i)
+  (or saved-command-line-args
+      (setq saved-command-line-args command-line-args
+            command-line-args ()))
+  (nth i saved-command-line-args))
+
+(defun invisible-argc ()
+  (length (or saved-command-line-args
+              command-line-args)))
+
+(defun invisible-argv (i)
+  (nth i (or saved-command-line-args
+             command-line-args)))
+
+(defun exit-emacs ()
+  (interactive)
+  (condition-case ()
+      (exit-recursive-edit)
+    (error (kill-emacs))))
+
+;; Lisp function buffer-size returns total including invisible;
+;; mocklisp wants just visible.
+(defun ml-buffer-size ()
+  (- (point-max) (point-min)))
+
+(defun previous-command ()
+  last-command)
+
+(defun beginning-of-window ()
+  (goto-char (window-start)))
+
+(defun end-of-window ()
+  (goto-char (window-start))
+  (vertical-motion (- (window-height) 2)))
+
+(defun ml-search-forward (string)
+  (search-forward string nil nil (ml-prefix-argument)))
+
+(defun ml-re-search-forward (string)
+  (re-search-forward string nil nil (ml-prefix-argument)))
+
+(defun ml-search-backward (string)
+  (search-backward string nil nil (ml-prefix-argument)))
+
+(defun ml-re-search-backward (string)
+  (re-search-backward string nil nil (ml-prefix-argument)))
+
+(defvar use-users-shell 1
+  "Mocklisp compatibility variable; 1 means use shell from SHELL env var.
+0 means use /bin/sh.")
+
+(defvar use-csh-option-f 1
+  "Mocklisp compatibility variable; 1 means pass -f when calling csh.")
+
+(defun filter-region (command)
+  (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
+        (csh (equal (file-name-nondirectory shell) "csh")))
+    (call-process-region (point) (mark) shell t t nil
+                         (if (and csh use-csh-option-f) "-cf" "-c")
+                         (concat "exec " command))))
+
+(defun execute-monitor-command (command)
+  (let ((shell (if (/= use-users-shell 0) shell-file-name "/bin/sh"))
+        (csh (equal (file-name-nondirectory shell) "csh")))
+    (call-process shell nil t t
+                  (if (and csh use-csh-option-f) "-cf" "-c")
+                  (concat "exec " command))))
+
+(defun use-syntax-table (name)
+  (set-syntax-table (symbol-value (intern (concat name "-syntax-table")))))
+
+(defun line-to-top-of-window ()
+  (recenter (1- (ml-prefix-argument))))
+
+(defun ml-previous-page (&optional arg)
+  (let ((count (or arg (ml-prefix-argument))))
+    (while (> count 0)
+      (scroll-down nil)
+      (setq count (1- count)))
+    (while (< count 0)
+      (scroll-up nil)
+      (setq count (1+ count)))))
+
+(defun ml-next-page ()
+  (previous-page (- (ml-prefix-argument))))
+
+(defun page-next-window (&optional arg)
+  (let ((count (or arg (ml-prefix-argument))))
+    (while (> count 0)
+      (scroll-other-window nil)
+      (setq count (1- count)))
+    (while (< count 0)
+      (scroll-other-window '-)
+      (setq count (1+ count)))))
+
+(defun ml-next-window ()
+  (select-window (next-window)))
+
+(defun ml-previous-window ()
+  (select-window (previous-window)))
+
+(defun scroll-one-line-up ()
+  (scroll-up (ml-prefix-argument)))
+
+(defun scroll-one-line-down ()
+  (scroll-down (ml-prefix-argument)))
+
+(defun split-current-window ()
+  (split-window (selected-window)))
+
+(defun last-key-struck () last-command-char)
+
+(defun execute-mlisp-line (string)
+  (eval (read string)))
+
+(defun move-dot-to-x-y (x y)
+  (goto-char (window-start (selected-window)))
+  (vertical-motion (1- y))
+  (move-to-column (1- x)))
+
+(defun ml-modify-syntax-entry (string)
+  (let ((i 5)
+        (len (length string))
+        (datastring (substring string 0 2)))
+    (if (= (aref string 0) ?\-)
+        (aset datastring 0 ?\ ))
+    (if (= (aref string 2) ?\{)
+        (if (= (aref string 4) ?\ )
+            (aset datastring 0 ?\<)
+          (error "Two-char comment delimiter: use modify-syntax-entry directly")))
+    (if (= (aref string 3) ?\})
+        (if (= (aref string 4) ?\ )
+            (aset datastring 0 ?\>)
+          (error "Two-char comment delimiter: use modify-syntax-entry directly")))
+    (while (< i len)
+      (modify-syntax-entry (aref string i) datastring)
+      (setq i (1+ i))
+      (if (and (< i len)
+               (= (aref string i) ?\-))
+          (let ((c (aref string (1- i)))
+                (lim (aref string (1+ i))))
+            (while (<= c lim)
+              (modify-syntax-entry c datastring)
+              (setq c (1+ c)))
+            (setq i (+ 2 i)))))))
+
+
+
+(defun ml-substr (string from to)
+  (let ((length (length string)))
+    (if (< from 0) (setq from (+ from length)))
+    (if (< to 0) (setq to (+ to length)))
+    (substring string from (+ from to))))