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- ;; This file contains extensions to GNU-Emacs, to wit:
- ; (1) some WEB-oriented functions that are also of general use
- ; (2) changes to the GNU-distributed TeX mode
- ; (3) definitions of simple WEB and CWEB modes
-
- ; To use: Put this in your EMACS-lisp library and say (load-library "cweb")
- ; in your .emacs init file.
-
- ; Contributed by Don Knuth, July 1990
-
- ;; OK, here's part (1): some WEB-oriented functions whose main purpose is
- ; to maintain a stack of module names that are "pending" as you are writing
- ; a program. When you first think of a module that needs to be written later,
- ; put it into the pending list (by typing CTL-Z instead of @> after the
- ; name). Later you can say CTL-\ to retrieve a pending name (and if
- ; you want to cycle through the pending names, ESC-y after CTL-\ will
- ; do it, just as ESC-y works after a yank).
- ; After you've said CTL-\, the current region is the name just removed from
- ; the pending list. If you change your mind, you can put it back again by
- ; saying ESC-\. If you had put it into the pending list by mistake, you
- ; can get rid of it by using the normal CTL-W operation (kill-region).
- ; The following code binds the new commands to CTL-Z, CTL-\, and ESC-\
- ; in all modes. You may prefer other bindings, of course.
- ; CTL-Z is normally "suspend emacs", but it is best not used when emacs
- ; has its own window as it usually does nowadays; if you need the
- ; old CTL-Z, you might rather bind it to CTL-X CTL-Z.
- ; CTL-\ is normally undefined.
- ; ESC-\ is normally "delete space", but ESC-space DEL does that easily too.
-
- (defvar pending-list nil
- "List of strings (usually WEB module names) still pending.")
-
- (defun into-pending-list (beg end)
- "Copy region into pending-list."
- (interactive "r")
- (indicate-region)
- (setq pending-list (cons (buffer-substring beg end) pending-list)))
-
- (defun new-module-name-pending ()
- "Insert @> to complete a module name, then put it into pending-list."
- (interactive)
- (insert "@>")
- (push-mark)
- (if (search-backward "@<" nil t)
- (progn
- (exchange-point-and-mark)
- (into-pending-list (point) (mark))
- )
- (message "There's no @< to begin the module name!")))
- (global-set-key "\C-z" 'new-module-name-pending)
-
- (defun pop-pending-list (arg)
- "Remove first element of pending-list and insert it as current region.
- With argument, put point at left; otherwise point will follow the insertion.
- Say \\[new-yank-pop] to replace this by another element of the list.
- Say \\[into-pending-list] to put it back in the list."
- (interactive "*P")
- (if (consp pending-list)
- (progn
- (push-mark (point))
- (insert (car pending-list))
- (setq pending-list (cdr pending-list))
- (if arg
- (exchange-point-and-mark)))
- (message "Nothing is pending.")
- (setq this-command nil)))
- (global-set-key "\C-\\" 'pop-pending-list)
- (global-set-key "\M-\\" 'into-pending-list)
-
- (defun new-yank-pop (arg)
- "If previous command was \\[pop-pending-list], pop a different string;
- otherwise do an ordinary Meta-y."
- (interactive "*p")
- (if (eq last-command 'pop-pending-list)
- (let (xch)
- (setq xch (< (point) (mark)))
- (setq pending-list (append pending-list
- (list (buffer-substring (point) (mark)))))
- (delete-region (point) (mark))
- (setq this-command 'pop-pending-list)
- (pop-pending-list xch))
- (yank-pop arg)))
- (global-set-key "\M-y" 'new-yank-pop)
-
- (defun indicate-region ()
- "Bounce cursor to mark and back again"
- (let ((point-save (point)))
- (unwind-protect
- (progn (goto-char (mark))
- ; The next two lines of code are controversial ---
- ; they seem to be the best way to do a short wait and redraw the screen with
- ; standard emacs primitives --- but the short wait is a "busy wait".
- ; On a faster machine, it would be better to install the function
- ; sit-for-millisecs found in sunfns.c (if not already installed)
- ; and to say (sit-for-millisecs 100) instead.
- ; On a slower machine, do the call-process only once.
- ; On a still slower machine, (sit-for 1) is probably best.
- (call-process "echo" nil nil t)
- (call-process "echo" nil nil t))
- (goto-char point-save))))
-
- ; I prefer to change the standard copy-region command to the following,
- ; which gives me visual feedback about what I've copied to the kill ring:
- (defun indicate-and-copy-region (beg end)
- "Indicate current region, then copy it to the kill ring."
- (interactive "r")(indicate-region)(copy-region-as-kill beg end))
- (global-set-key "\M-w" 'indicate-and-copy-region)
-
- ; Here's another convenient command, bound to the usually unused ESC-".
- (defun ditto (arg)
- "Copy ARG characters from the line above."
- (interactive "*p")
- (let (ch)
- (while (> arg 0)
- (setq temporary-goal-column (current-column))
- (save-excursion
- (previous-line 1)
- (setq ch (following-char)))
- (insert ch)
- (setq arg (1- arg)))))
- (global-set-key "\M-\"" 'ditto)
-
- ;; OK, here's part (2): Changes to TeX mode.
- ; The WEB modes below are very much like TeX mode, but some improvements were
- ; desirable in TeX mode:
- ; I made newline act as it does in indented-text mode, since this
- ; works nicely for both TeX and WEB (Pascal or C code).
- ; I made RET check for unmatched delimiters if it ends a paragraph.
- ; Otherwise TeX mode remains as it was before.
-
- (setq TeX-mode-map (make-sparse-keymap))
- (define-key TeX-mode-map "\C-c\C-k" 'TeX-kill-job)
- (define-key TeX-mode-map "\C-c\C-l" 'TeX-recenter-output-buffer)
- (define-key TeX-mode-map "\C-c\C-q" 'TeX-show-print-queue)
- (define-key TeX-mode-map "\C-c\C-p" 'TeX-print)
- (define-key TeX-mode-map "\"" 'TeX-insert-quote)
- (define-key TeX-mode-map "\e}" 'up-list)
- (define-key TeX-mode-map "\e{" 'TeX-insert-braces)
- (define-key TeX-mode-map "\C-c\C-r" 'TeX-region)
- (define-key TeX-mode-map "\C-c\C-b" 'TeX-buffer)
- (define-key TeX-mode-map "\C-c\C-f" 'TeX-close-LaTeX-block)
- (define-key TeX-mode-map "\r" 'TeX-newline)
- (define-key TeX-mode-map "\t" 'indent-relative)
- (setq TeX-mode-hook '(lambda ()
- (make-local-variable 'indent-line-function)
- (setq indent-line-function 'indent-relative-maybe)))
-
- (defun TeX-newline (arg)
- "If previous character is newline and no ARG, check for unbalanced braces
- and/or dollar signs in previous paragraph. If ARG is \\[universal-argument],
- do a single newline; otherwise do ordinary newline."
- (interactive "*P")
- (if (and (eq (preceding-char) ?\n) (not arg))
- (TeX-check-paragraph)
- (if (listp arg)
- (newline)
- (newline arg))))
-
- (defun TeX-check-paragraph ()
- "Insert a newline following a newline, breaking a paragraph for TeX.
- Check for mismatched delimiters in paragraph being terminated."
- (interactive)
- (if (TeX-validate-paragraph
- (save-excursion
- (search-backward "\n\n" nil 'move)
- (point))
- (point))
- (insert ?\n)
- (insert ?\n)
- (error "Mismatched delimiters in that paragraph?")))
-
- ;; and now, part (3): WEB and CWEB modes.
- ; These are like plain TeX mode except that the automatic conversion of
- ; " to `` or '' is disabled. (Personally I never liked that feature anyway,
- ; since it's easy to get used to typing `` and ''. In WEB modes, the
- ; feature soon becomes intolerable, unless you never use string constants!)
- ; Another thing distinguishing WEB mode from TeX is ESC-p and ESC-n, to
- ; move to previous or next module. These keys are usually unbound, except
- ; when processing email.
-
- (defun forward-module (arg)
- "Advance past next WEB module beginning; with ARG, repeat ARG times."
- (interactive "p")
- (move-to-module arg))
- (defun backward-module (arg)
- "Advance to previous WEB module beginning; with ARG, repeat ARG times."
- (interactive "p")
- (move-to-module (- arg)))
- (defun move-to-module (arg)
- (while (> arg 0)
- (re-search-forward "@ \\|@\\*\\|@\n")
- (setq arg (1- arg)))
- (while (< arg 0)
- (re-search-backward "@ \\|@\\*\\|@\n")
- (setq arg (1+ arg))))
-
- (defun web-mode ()
- "Major mode like TeX mode plus \\[forward-module] and \\[backward-module]
- for relative module movement. The automatic \" feature is disabled."
- (interactive)
- (plain-tex-mode)
- (local-set-key "\M-n" 'forward-module)
- (local-set-key "\M-p" 'backward-module)
- (local-set-key "\"" 'self-insert-command)
- (setq mode-name "WEB")
- (setq major-mode 'web-mode)
- (run-hooks 'web-mode-hook))
- (setq auto-mode-alist (cons '("\\.web$" . web-mode) auto-mode-alist))
-
- (defun cweb-mode ()
- "Major mode like TeX mode plus \\[forward-module] and \\[backward-module]
- for relative module movement. The automatic \" feature is disabled."
- (interactive)
- (plain-tex-mode)
- (local-set-key "\M-n" 'forward-module)
- (local-set-key "\M-p" 'backward-module)
- (local-set-key "\"" 'self-insert-command)
- (setq mode-name "CWEB")
- (setq major-mode 'cweb-mode)
- (run-hooks 'cweb-mode-hook))
- (setq auto-mode-alist (cons '("\\.w$" . cweb-mode) auto-mode-alist))
- (setq auto-mode-alist (cons '("\\.ch$" . cweb-mode) auto-mode-alist))
-