File:  [gforth] / gforth / gforth.el
Revision 1.2: download - view: text, annotated - select for diffs
Fri Jun 17 12:35:01 1994 UTC (27 years, 1 month ago) by anton
Branches: MAIN
CVS tags: HEAD
Integrated locals (in particular automatic scoping) into the system.

    1: ;; This file is part of GNU Emacs.
    2: ;; Changes by anton
    3: 
    4: ;; GNU Emacs is distributed in the hope that it will be useful,
    5: ;; but WITHOUT ANY WARRANTY.  No author or distributor
    6: ;; accepts responsibility to anyone for the consequences of using it
    7: ;; or for whether it serves any particular purpose or works at all,
    8: ;; unless he says so in writing.  Refer to the GNU Emacs General Public
    9: ;; License for full details.
   10: 
   11: ;; Everyone is granted permission to copy, modify and redistribute
   12: ;; GNU Emacs, but only under the conditions described in the
   13: ;; GNU Emacs General Public License.   A copy of this license is
   14: ;; supposed to have been given to you along with GNU Emacs so you
   15: ;; can know your rights and responsibilities.  It should be in a
   16: ;; file named COPYING.  Among other things, the copyright notice
   17: ;; and this notice must be preserved on all copies.
   18: 
   19: ;;; $Header: /nfs/unsafe/cvs-repository/src-master/gforth/gforth.el,v 1.2 1994/06/17 12:35:01 anton Exp $
   20: 
   21: ;;-------------------------------------------------------------------
   22: ;; A Forth indentation, documentation search and interaction library
   23: ;;-------------------------------------------------------------------
   24: ;;
   25: ;; Written by Goran Rydqvist, gorry@ida.liu.se, Summer 1988
   26: ;; Started:	16 July 88
   27: ;; Version:	2.10
   28: ;; Last update:	5 December 1989 by Mikael Patel, mip@ida.liu.se
   29: ;; Last update:	25 June 1990 by Goran Rydqvist, gorry@ida.liu.se
   30: ;;
   31: ;; Documentation: See forth-mode (^HF forth-mode)
   32: ;;-------------------------------------------------------------------
   33: 
   34: 
   35: (defvar forth-positives
   36:   " : begin do ?do while if ?dup-if ?dup-not-if else case create does> exception> "
   37:   "Contains all words which will cause the indent-level to be incremented
   38: on the next line.
   39: OBS! All words in forth-positives must be surrounded by spaces.")
   40: 
   41: (defvar forth-negatives
   42:   " ; until repeat while +loop loop else then endif again endcase does> "
   43:   "Contains all words which will cause the indent-level to be decremented
   44: on the current line.
   45: OBS! All words in forth-negatives must be surrounded by spaces.")
   46: 
   47: (defvar forth-zeroes
   48:   " : "
   49:   "Contains all words which causes the indent to go to zero")
   50: 
   51: (defvar forth-mode-abbrev-table nil
   52:   "Abbrev table in use in Forth-mode buffers.")
   53: 
   54: (define-abbrev-table 'forth-mode-abbrev-table ())
   55: 
   56: (defvar forth-mode-map nil
   57:   "Keymap used in Forth mode.")
   58: 
   59: (if (not forth-mode-map)
   60:     (setq forth-mode-map (make-sparse-keymap)))
   61: 
   62: (global-set-key "\e\C-m" 'forth-send-paragraph)
   63: (global-set-key "\C-x\C-m" 'forth-split)
   64: (global-set-key "\e " 'forth-reload)
   65: 
   66: (define-key forth-mode-map "\e\C-m" 'forth-send-paragraph)
   67: (define-key forth-mode-map "\eo" 'forth-send-buffer)
   68: (define-key forth-mode-map "\C-x\C-m" 'forth-split)
   69: (define-key forth-mode-map "\e " 'forth-reload)
   70: (define-key forth-mode-map "\t" 'forth-indent-command)
   71: (define-key forth-mode-map "\C-m" 'reindent-then-newline-and-indent)
   72: 
   73: (defvar forth-mode-syntax-table nil
   74:   "Syntax table in use in Forth-mode buffers.")
   75: 
   76: (if (not forth-mode-syntax-table)
   77:     (progn
   78:       (setq forth-mode-syntax-table (make-syntax-table))
   79:       (modify-syntax-entry ?\\ "\\" forth-mode-syntax-table)
   80:       (modify-syntax-entry ?/ ". 14" forth-mode-syntax-table)
   81:       (modify-syntax-entry ?* ". 23" forth-mode-syntax-table)
   82:       (modify-syntax-entry ?+ "." forth-mode-syntax-table)
   83:       (modify-syntax-entry ?- "." forth-mode-syntax-table)
   84:       (modify-syntax-entry ?= "." forth-mode-syntax-table)
   85:       (modify-syntax-entry ?% "." forth-mode-syntax-table)
   86:       (modify-syntax-entry ?< "." forth-mode-syntax-table)
   87:       (modify-syntax-entry ?> "." forth-mode-syntax-table)
   88:       (modify-syntax-entry ?& "." forth-mode-syntax-table)
   89:       (modify-syntax-entry ?| "." forth-mode-syntax-table)
   90:       (modify-syntax-entry ?\' "\"" forth-mode-syntax-table)
   91:       (modify-syntax-entry ?\t "    " forth-mode-syntax-table)
   92:       (modify-syntax-entry ?) ">   " forth-mode-syntax-table)
   93:       (modify-syntax-entry ?( "<   " forth-mode-syntax-table)
   94:       (modify-syntax-entry ?\( "()  " forth-mode-syntax-table)
   95:       (modify-syntax-entry ?\) ")(  " forth-mode-syntax-table)))
   96: 
   97: (defconst forth-indent-level 4
   98:   "Indentation of Forth statements.")
   99: 
  100: (defun forth-mode-variables ()
  101:   (set-syntax-table forth-mode-syntax-table)
  102:   (setq local-abbrev-table forth-mode-abbrev-table)
  103:   (make-local-variable 'paragraph-start)
  104:   (setq paragraph-start (concat "^$\\|" page-delimiter))
  105:   (make-local-variable 'paragraph-separate)
  106:   (setq paragraph-separate paragraph-start)
  107:   (make-local-variable 'indent-line-function)
  108:   (setq indent-line-function 'forth-indent-line)
  109:   (make-local-variable 'require-final-newline)
  110:   (setq require-final-newline t)
  111:   (make-local-variable 'comment-start)
  112:   (setq comment-start "( ")
  113:   (make-local-variable 'comment-end)
  114:   (setq comment-end " )")
  115:   (make-local-variable 'comment-column)
  116:   (setq comment-column 40)
  117:   (make-local-variable 'comment-start-skip)
  118:   (setq comment-start-skip "( ")
  119:   (make-local-variable 'comment-indent-hook)
  120:   (setq comment-indent-hook 'forth-comment-indent)
  121:   (make-local-variable 'parse-sexp-ignore-comments)
  122:   (setq parse-sexp-ignore-comments t))
  123:   
  124: ;;;###autoload
  125: (defun forth-mode ()
  126:   "
  127: Major mode for editing Forth code. Tab indents for Forth code. Comments
  128: are delimited with ( ). Paragraphs are separated by blank lines only.
  129: Delete converts tabs to spaces as it moves back.
  130: \\{forth-mode-map}
  131:  Forth-split
  132:     Positions the current buffer on top and a forth-interaction window
  133:     below. The window size is controlled by the forth-percent-height
  134:     variable (see below).
  135:  Forth-reload
  136:     Reloads the forth library and restarts the forth process.
  137:  Forth-send-buffer
  138:     Sends the current buffer, in text representation, as input to the
  139:     forth process.
  140:  Forth-send-paragraph
  141:     Sends the previous or the current paragraph to the forth-process.
  142:     Note that the cursor only need to be with in the paragraph to be sent.
  143: forth-documentation
  144:     Search for documentation of forward adjacent to cursor. Note! To use
  145:     this mode you have to add a line, to your .emacs file, defining the
  146:     directories to search through for documentation files (se variable
  147:     forth-help-load-path below) e.g. (setq forth-help-load-path '(nil)).
  148: 
  149: Variables controlling interaction and startup
  150:  forth-percent-height
  151:     Tells split how high to make the edit portion, in percent of the
  152:     current screen height.
  153:  forth-program-name
  154:     Tells the library which program name to execute in the interation
  155:     window.
  156: 
  157: Variables controlling indentation style:
  158:  forth-positives
  159:     A string containing all words which causes the indent-level of the
  160:     following line to be incremented.
  161:     OBS! Each word must be surronded by spaces.
  162:  forth-negatives
  163:     A string containing all words which causes the indentation of the
  164:     current line to be decremented, if the word begin the line. These
  165:     words also has a cancelling effect on the indent-level of the
  166:     following line, independent of position.
  167:     OBS! Each word must be surronded by spaces.
  168:  forth-zeroes
  169:     A string containing all words which causes the indentation of the
  170:     current line to go to zero, if the word begin the line.
  171:     OBS! Each word must be surronded by spaces.
  172:  forth-indent-level
  173:     Indentation increment/decrement of Forth statements.
  174: 
  175:  Note! A word which decrements the indentation of the current line, may
  176:     also be mentioned in forth-positives to cause the indentation to
  177:     resume the previous level.
  178: 
  179: Variables controling documentation search
  180:  forth-help-load-path
  181:     List of directories to search through to find *.doc
  182:     (forth-help-file-suffix) files. Nil means current default directory.
  183:     The specified directories must contain at least one .doc file. If it
  184:     does not and you still want the load-path to scan that directory, create
  185:     an empty file dummy.doc.
  186:  forth-help-file-suffix
  187:     The file names to search for in each directory specified by
  188:     forth-help-load-path. Defaulted to '*.doc'. 
  189: "
  190:   (interactive)
  191:   (kill-all-local-variables)
  192:   (use-local-map forth-mode-map)
  193:   (setq mode-name "Forth")
  194:   (setq major-mode 'forth-mode)
  195:   (forth-mode-variables)
  196: ;  (if (not (forth-process-running-p))
  197: ;      (run-forth forth-program-name))
  198:   (run-hooks 'forth-mode-hook))
  199: 
  200: (defun forth-comment-indent ()
  201:   (save-excursion
  202:     (beginning-of-line)
  203:     (if (looking-at ":[ \t]*")
  204: 	(progn
  205: 	  (end-of-line)
  206: 	  (skip-chars-backward " \t\n")
  207: 	  (1+ (current-column)))
  208:       comment-column)))
  209: 
  210: (defun forth-current-indentation ()
  211:   (save-excursion
  212:     (beginning-of-line)
  213:     (back-to-indentation)
  214:     (current-column)))
  215: 
  216: (defun forth-delete-indentation ()
  217:   (let ((b nil) (m nil))
  218:     (save-excursion
  219:       (beginning-of-line)
  220:       (setq b (point))
  221:       (back-to-indentation)
  222:       (setq m (point)))
  223:     (delete-region b m)))
  224: 
  225: (defun forth-indent-line (&optional flag)
  226:   "Correct indentation of the current Forth line."
  227:   (let ((x (forth-calculate-indent)))
  228:     (forth-indent-to x)))
  229:   
  230: (defun forth-indent-command ()
  231:   (interactive)
  232:   (forth-indent-line t))
  233: 
  234: (defun forth-indent-to (x)
  235:   (let ((p nil))
  236:     (setq p (- (current-column) (forth-current-indentation)))
  237:     (forth-delete-indentation)
  238:     (beginning-of-line)
  239:     (indent-to x)
  240:     (if (> p 0) (forward-char p))))
  241: 
  242: ;;Calculate indent
  243: (defun forth-calculate-indent ()
  244:   (let ((w1 nil) (indent 0) (centre 0))
  245:     (save-excursion
  246:       (beginning-of-line)
  247:       (skip-chars-backward " \t\n")
  248:       (beginning-of-line)
  249:       (back-to-indentation)
  250:       (setq indent (current-column))
  251:       (setq centre indent)
  252:       (setq indent (+ indent (forth-sum-line-indentation))))
  253:     (save-excursion
  254:       (beginning-of-line)
  255:       (back-to-indentation)
  256:       (let ((p (point)))
  257: 	(skip-chars-forward "^ \t\n")
  258: 	(setq w1 (buffer-substring p (point)))))
  259:     (if (> (- indent centre) forth-indent-level)
  260: 	(setq indent (+ centre forth-indent-level)))
  261:     (if (> (- centre indent) forth-indent-level)
  262: 	(setq indent (- centre forth-indent-level)))
  263:     (if (< indent 0) (setq indent 0))
  264:     (setq indent (- indent
  265: 		    (if (string-match 
  266: 			 (regexp-quote (concat " " w1 " "))
  267: 			 forth-negatives)
  268: 			forth-indent-level 0)))
  269:     (if (string-match (regexp-quote (concat " " w1 " ")) forth-zeroes)
  270: 	(setq indent 0))
  271:     indent))
  272: 
  273: (defun forth-sum-line-indentation ()
  274:   "Add upp the positive and negative weights of all words on the current line."
  275:   (let ((b (point)) (e nil) (sum 0) (w nil) (t1 nil) (t2 nil) (first t))
  276:     (end-of-line) (setq e (point))
  277:     (goto-char b)
  278:     (while (< (point) e)
  279:       (setq w (forth-next-word))
  280:       (setq t1 (string-match (regexp-quote (concat " " w " "))
  281: 			     forth-positives))
  282:       (setq t2 (string-match (regexp-quote (concat " " w " "))
  283: 			     forth-negatives))
  284:       (if (and t1 t2)
  285: 	  (setq sum (+ sum forth-indent-level)))
  286:       (if t1
  287: 	  (setq sum (+ sum forth-indent-level)))
  288:       (if (and t2 (not first))
  289: 	  (setq sum (- sum forth-indent-level)))
  290:       (skip-chars-forward " \t")
  291:       (setq first nil))
  292:     sum))
  293: 
  294: 
  295: (defun forth-next-word ()
  296:   "Return the next forth-word. Skip anything enclosed in double quotes or ()."
  297:   (let ((w1 nil))
  298:     (while (not w1)
  299:       (skip-chars-forward " \t\n")
  300:       (let ((p (point)))
  301: 	(skip-chars-forward "^ \t\n")
  302: 	(setq w1 (buffer-substring p (point))))
  303:       (cond ((string-match "\"" w1)
  304: 	     (progn
  305: 	       (skip-chars-forward "^\"")
  306: 	       (setq w1 nil)))
  307: 	    ((string-match "\(" w1)
  308: 	     (progn
  309: 	       (skip-chars-forward "^\)")
  310: 	       (setq w1 nil)))
  311: 	    (t nil)))
  312:     w1))
  313:       
  314: 
  315: ;; Forth commands
  316: 
  317: (defvar forth-program-name "forth"
  318:   "*Program invoked by the `run-forth' command.")
  319: 
  320: (defvar forth-band-name nil
  321:   "*Band loaded by the `run-forth' command.")
  322: 
  323: (defvar forth-program-arguments nil
  324:   "*Arguments passed to the Forth program by the `run-forth' command.")
  325: 
  326: (defun run-forth (command-line)
  327:   "Run an inferior Forth process. Output goes to the buffer `*forth*'.
  328: With argument, asks for a command line. Split up screen and run forth 
  329: in the lower portion. The current-buffer when called will stay in the
  330: upper portion of the screen, and all other windows are deleted.
  331: Call run-forth again to make the *forth* buffer appear in the lower
  332: part of the screen."
  333:   (interactive
  334:    (list (let ((default
  335: 		 (or forth-process-command-line
  336: 		     (forth-default-command-line))))
  337: 	   (if current-prefix-arg
  338: 	       (read-string "Run Forth: " default)
  339: 	       default))))
  340:   (setq forth-process-command-line command-line)
  341:   (forth-start-process command-line)
  342:   (forth-split)
  343:   (forth-set-runlight forth-runlight:input))
  344: 
  345: (defun reset-forth ()
  346:   "Reset the Forth process."
  347:   (interactive)
  348:   (let ((process (get-process forth-program-name)))
  349:     (cond ((or (not process)
  350: 	       (not (eq (process-status process) 'run))
  351: 	       (yes-or-no-p
  352: "The Forth process is running, are you SURE you want to reset it? "))
  353: 	   (message "Resetting Forth process...")
  354: 	   (forth-reload)
  355: 	   (message "Resetting Forth process...done")))))
  356: 
  357: (defun forth-default-command-line ()
  358:   (concat forth-program-name " -emacs"
  359: 	  (if forth-program-arguments
  360: 	      (concat " " forth-program-arguments)
  361: 	      "")
  362: 	  (if forth-band-name
  363: 	      (concat " -band " forth-band-name)
  364: 	      "")))
  365: 
  366: ;;;; Internal Variables
  367: 
  368: (defvar forth-process-command-line nil
  369:   "Command used to start the most recent Forth process.")
  370: 
  371: (defvar forth-previous-send ""
  372:   "Most recent expression transmitted to the Forth process.")
  373: 
  374: (defvar forth-process-filter-queue '()
  375:   "Queue used to synchronize filter actions properly.")
  376: 
  377: (defvar forth-prompt "ok"
  378:   "The current forth prompt string.")
  379: 
  380: (defvar forth-start-hook nil
  381:   "If non-nil, a procedure to call when the Forth process is started.
  382: When called, the current buffer will be the Forth process-buffer.")
  383: 
  384: (defvar forth-signal-death-message nil
  385:   "If non-nil, causes a message to be generated when the Forth process dies.")
  386: 
  387: (defvar forth-percent-height 62
  388:   "Tells run-forth how high the upper window should be in percent.")
  389: 
  390: (defconst forth-runlight:input ?I
  391:   "The character displayed when the Forth process is waiting for input.")
  392: 
  393: (defvar forth-mode-string ""
  394:   "String displayed in the mode line when the Forth process is running.")
  395: 
  396: ;;;; Evaluation Commands
  397: 
  398: (defun forth-send-string (&rest strings)
  399:   "Send the string arguments to the Forth process.
  400: The strings are concatenated and terminated by a newline."
  401:   (cond ((forth-process-running-p)
  402: 	 (forth-send-string-1 strings))
  403: 	((yes-or-no-p "The Forth process has died.  Reset it? ")
  404: 	 (reset-forth)
  405: 	 (goto-char (point-max))
  406: 	 (forth-send-string-1 strings))))
  407: 
  408: (defun forth-send-string-1 (strings)
  409:   (let ((string (apply 'concat strings)))
  410:     (forth-send-string-2 string)))
  411: 
  412: (defun forth-send-string-2 (string)
  413:   (let ((process (get-process forth-program-name)))
  414:     (if (not (eq (current-buffer) (get-buffer forth-program-name)))
  415: 	(progn
  416: 	 (forth-process-filter-output string)
  417: 	 (forth-process-filter:finish)))
  418:     (send-string process (concat string "\n"))
  419:     (if (eq (current-buffer) (process-buffer process))
  420: 	(set-marker (process-mark process) (point)))))
  421: 
  422: 
  423: (defun forth-send-region (start end)
  424:   "Send the current region to the Forth process.
  425: The region is sent terminated by a newline."
  426:   (interactive "r")
  427:   (let ((process (get-process forth-program-name)))
  428:     (if (and process (eq (current-buffer) (process-buffer process)))
  429: 	(progn (goto-char end)
  430: 	       (set-marker (process-mark process) end))))
  431:   (forth-send-string "\n" (buffer-substring start end) "\n"))
  432: 
  433: (defun forth-end-of-paragraph ()
  434:   (if (looking-at "[\t\n ]+") (skip-chars-backward  "\t\n "))
  435:   (if (not (re-search-forward "\n[ \t]*\n" nil t))
  436:       (goto-char (point-max))))
  437: 
  438: (defun forth-send-paragraph ()
  439:   "Send the current or the previous paragraph to the Forth process"
  440:   (interactive)
  441:   (let (end)
  442:     (save-excursion
  443:       (forth-end-of-paragraph)
  444:       (skip-chars-backward  "\t\n ")
  445:       (setq end (point))
  446:       (if (re-search-backward "\n[ \t]*\n" nil t)
  447: 	  (setq start (point))
  448: 	(goto-char (point-min)))
  449:       (skip-chars-forward  "\t\n ")
  450:       (forth-send-region (point) end))))
  451:   
  452: (defun forth-send-buffer ()
  453:   "Send the current buffer to the Forth process."
  454:   (interactive)
  455:   (if (eq (current-buffer) (forth-process-buffer))
  456:       (error "Not allowed to send this buffer's contents to Forth"))
  457:   (forth-send-region (point-min) (point-max)))
  458: 
  459: 
  460: ;;;; Basic Process Control
  461: 
  462: (defun forth-start-process (command-line)
  463:   (let ((buffer (get-buffer-create "*forth*")))
  464:     (let ((process (get-buffer-process buffer)))
  465:       (save-excursion
  466: 	(set-buffer buffer)
  467: 	(progn (if process (delete-process process))
  468: 	       (goto-char (point-max))
  469: 	       (setq mode-line-process '(": %s"))
  470: 	       (add-to-global-mode-string 'forth-mode-string)
  471: 	       (setq process
  472: 		     (apply 'start-process
  473: 			    (cons forth-program-name
  474: 				  (cons buffer
  475: 					(forth-parse-command-line
  476: 					 command-line)))))
  477: 	       (set-marker (process-mark process) (point-max))
  478: 	       (forth-process-filter-initialize t)
  479: 	       (forth-modeline-initialize)
  480: 	       (set-process-sentinel process 'forth-process-sentinel)
  481: 	       (set-process-filter process 'forth-process-filter)
  482: 	       (run-hooks 'forth-start-hook)))
  483:     buffer)))
  484: 
  485: (defun forth-parse-command-line (string)
  486:   (setq string (substitute-in-file-name string))
  487:   (let ((start 0)
  488: 	(result '()))
  489:     (while start
  490:       (let ((index (string-match "[ \t]" string start)))
  491: 	(setq start
  492: 	      (cond ((not index)
  493: 		     (setq result
  494: 			   (cons (substring string start)
  495: 				 result))
  496: 		     nil)
  497: 		    ((= index start)
  498: 		     (string-match "[^ \t]" string start))
  499: 		    (t
  500: 		     (setq result
  501: 			   (cons (substring string start index)
  502: 				 result))
  503: 		     (1+ index))))))
  504:     (nreverse result)))
  505: 
  506: 
  507: (defun forth-process-running-p ()
  508:   "True iff there is a Forth process whose status is `run'."
  509:   (let ((process (get-process forth-program-name)))
  510:     (and process
  511: 	 (eq (process-status process) 'run))))
  512: 
  513: (defun forth-process-buffer ()
  514:   (let ((process (get-process forth-program-name)))
  515:     (and process (process-buffer process))))
  516: 
  517: ;;;; Process Filter
  518: 
  519: (defun forth-process-sentinel (proc reason)
  520:   (let ((inhibit-quit nil))
  521:     (forth-process-filter-initialize (eq reason 'run))
  522:     (if (eq reason 'run)
  523: 	(forth-modeline-initialize)
  524: 	(setq forth-mode-string "")))
  525:   (if (and (not (memq reason '(run stop)))
  526: 	   forth-signal-death-message)
  527:       (progn (beep)
  528: 	     (message
  529: "The Forth process has died!  Do M-x reset-forth to restart it"))))
  530: 
  531: (defun forth-process-filter-initialize (running-p)
  532:   (setq forth-process-filter-queue (cons '() '()))
  533:   (setq forth-prompt "ok"))
  534: 
  535: 
  536: (defun forth-process-filter (proc string)
  537:   (forth-process-filter-output string)
  538:   (forth-process-filter:finish))
  539: 
  540: (defun forth-process-filter:enqueue (action)
  541:   (let ((next (cons action '())))
  542:     (if (cdr forth-process-filter-queue)
  543: 	(setcdr (cdr forth-process-filter-queue) next)
  544: 	(setcar forth-process-filter-queue next))
  545:     (setcdr forth-process-filter-queue next)))
  546: 
  547: (defun forth-process-filter:finish ()
  548:   (while (car forth-process-filter-queue)
  549:     (let ((next (car forth-process-filter-queue)))
  550:       (setcar forth-process-filter-queue (cdr next))
  551:       (if (not (cdr next))
  552: 	  (setcdr forth-process-filter-queue '()))
  553:       (apply (car (car next)) (cdr (car next))))))
  554: 
  555: ;;;; Process Filter Output
  556: 
  557: (defun forth-process-filter-output (&rest args)
  558:   (if (not (and args
  559: 		(null (cdr args))
  560: 		(stringp (car args))
  561: 		(string-equal "" (car args))))
  562:       (forth-process-filter:enqueue
  563:        (cons 'forth-process-filter-output-1 args))))
  564: 
  565: (defun forth-process-filter-output-1 (&rest args)
  566:   (save-excursion
  567:     (forth-goto-output-point)
  568:     (apply 'insert-before-markers args)))
  569: 
  570: (defun forth-guarantee-newlines (n)
  571:   (save-excursion
  572:     (forth-goto-output-point)
  573:     (let ((stop nil))
  574:       (while (and (not stop)
  575: 		  (bolp))
  576: 	(setq n (1- n))
  577: 	(if (bobp)
  578: 	    (setq stop t)
  579: 	  (backward-char))))
  580:     (forth-goto-output-point)
  581:     (while (> n 0)
  582:       (insert-before-markers ?\n)
  583:       (setq n (1- n)))))
  584: 
  585: (defun forth-goto-output-point ()
  586:   (let ((process (get-process forth-program-name)))
  587:     (set-buffer (process-buffer process))
  588:     (goto-char (process-mark process))))
  589: 
  590: (defun forth-modeline-initialize ()
  591:   (setq forth-mode-string "  "))
  592: 
  593: (defun forth-set-runlight (runlight)
  594:   (aset forth-mode-string 0 runlight)
  595:   (forth-modeline-redisplay))
  596: 
  597: (defun forth-modeline-redisplay ()
  598:   (save-excursion (set-buffer (other-buffer)))
  599:   (set-buffer-modified-p (buffer-modified-p))
  600:   (sit-for 0))
  601: 
  602: ;;;; Process Filter Operations
  603: 
  604: (defun add-to-global-mode-string (x)
  605:   (cond ((null global-mode-string)
  606: 	 (setq global-mode-string (list "" x " ")))
  607: 	((not (memq x global-mode-string))
  608: 	 (setq global-mode-string
  609: 	       (cons ""
  610: 		     (cons x
  611: 			   (cons " "
  612: 				 (if (equal "" (car global-mode-string))
  613: 				     (cdr global-mode-string)
  614: 				     global-mode-string))))))))
  615: 
  616: 
  617: ;; Misc
  618: 
  619: (setq auto-mode-alist (append auto-mode-alist
  620: 				'(("\\.f83$" . forth-mode))))
  621: 
  622: (defun forth-split ()
  623:   (interactive)
  624:   (forth-split-1 "*forth*"))
  625: 
  626: (defun forth-split-1 (buffer)
  627:   (if (not (eq (window-buffer) (get-buffer buffer)))
  628:       (progn
  629: 	(delete-other-windows)
  630: 	(split-window-vertically
  631: 	 (/ (* (screen-height) forth-percent-height) 100))
  632: 	(other-window 1)
  633: 	(switch-to-buffer buffer)
  634: 	(goto-char (point-max))
  635: 	(other-window 1))))
  636:     
  637: (defun forth-reload ()
  638:   (interactive)
  639:   (let ((process (get-process forth-program-name)))
  640:     (if process (kill-process process t)))
  641:   (sleep-for-millisecs 100)
  642:   (forth-mode))
  643: 
  644: 
  645: ;; Special section for forth-help
  646: 
  647: (defvar forth-help-buffer "*Forth-help*"
  648:   "Buffer used to display the requested documentation.")
  649: 
  650: (defvar forth-help-load-path nil
  651:   "List of directories to search through to find *.doc
  652:  (forth-help-file-suffix) files. Nil means current default directory.
  653:  The specified directories must contain at least one .doc file. If it
  654:  does not and you still want the load-path to scan that directory, create
  655:  an empty file dummy.doc.")
  656: 
  657: (defvar forth-help-file-suffix "*.doc"
  658:   "The file names to search for in each directory.")
  659: 
  660: (setq forth-search-command-prefix "grep -n \"^    [^(]* ")
  661: (defvar forth-search-command-suffix "/dev/null")
  662: (defvar forth-grep-error-regexp ": No such file or directory")
  663: 
  664: (defun forth-function-called-at-point ()
  665:   "Return the space delimited word a point."
  666:   (save-excursion
  667:     (save-restriction
  668:       (narrow-to-region (max (point-min) (- (point) 1000)) (point-max))
  669:       (skip-chars-backward "^ \t\n" (point-min))
  670:       (if (looking-at "[ \t\n]")
  671: 	  (forward-char 1))
  672:       (let (obj (p (point)))
  673: 	(skip-chars-forward "^ \t\n")
  674: 	(buffer-substring p (point))))))
  675: 
  676: (defun forth-help-names-extend-comp (path-list result)
  677:   (cond ((null path-list) result)
  678: 	((null (car path-list))
  679: 	 (forth-help-names-extend-comp (cdr path-list) 
  680: 	       (concat result forth-help-file-suffix " ")))
  681: 	(t (forth-help-names-extend-comp
  682: 	    (cdr path-list) (concat result
  683: 				    (expand-file-name (car path-list)) "/"
  684: 				    forth-help-file-suffix " ")))))
  685: 
  686: (defun forth-help-names-extended ()
  687:   (if forth-help-load-path
  688:       (forth-help-names-extend-comp forth-help-load-path "")
  689:     (error "forth-help-load-path not specified")))
  690: 
  691: 
  692: (define-key forth-mode-map "\C-hf" 'forth-documentation)
  693: 
  694: (defun forth-documentation (function)
  695:   "Display the full documentation of FORTH word."
  696:   (interactive
  697:    (let ((fn (forth-function-called-at-point))
  698: 	 (enable-recursive-minibuffers t)	     
  699: 	 search-list
  700: 	 val)
  701:      (setq val (read-string (format "Describe forth word (default %s): " fn)))
  702:      (list (if (equal val "") fn val))))
  703:   (forth-get-doc (concat forth-search-command-prefix
  704: 			 (grep-regexp-quote (concat function " ("))
  705: 			 "[^)]*\-\-\" " (forth-help-names-extended)
  706: 			 forth-search-command-suffix))
  707:   (message "C-x C-m switches back to the forth interaction window"))
  708: 
  709: (defun forth-get-doc (command)
  710:   "Display the full documentation of command."
  711:   (let ((curwin (get-buffer-window (window-buffer)))
  712: 	reswin
  713: 	pointmax)
  714:     (with-output-to-temp-buffer forth-help-buffer
  715:       (progn
  716: 	(call-process "sh" nil forth-help-buffer t "-c" command)
  717: 	(setq reswin (get-buffer-window forth-help-buffer))))
  718:     (setq reswin (get-buffer-window forth-help-buffer))
  719:     (select-window reswin)
  720:     (save-excursion
  721:       (goto-char (setq pointmax (point-max)))
  722:       (insert "--------------------\n\n"))
  723:     (let (fd doc) 
  724:       (while (setq fd (forth-get-file-data pointmax))
  725: 	(setq doc (forth-get-doc-string fd))
  726: 	(save-excursion
  727: 	  (goto-char (point-max))
  728: 	  (insert (substring (car fd) (string-match "[^/]*$" (car fd)))
  729: 		  ":\n\n" doc "\n")))
  730:       (if (not doc)
  731: 	  (progn (goto-char (point-max)) (insert "Not found"))))
  732:     (select-window curwin)))
  733:   
  734: (defun forth-skip-error-lines ()
  735:   (let ((lines 0))
  736:     (save-excursion
  737:       (while (re-search-forward forth-grep-error-regexp nil t)
  738: 	(beginning-of-line)
  739: 	(forward-line 1)
  740: 	(setq lines (1+ lines))))
  741:     (forward-line lines)))
  742: 
  743: (defun forth-get-doc-string (fd)
  744:   "Find file (car fd) and extract documentation from line (nth 1 fd)."
  745:   (let (result)
  746:     (save-window-excursion
  747:       (find-file (car fd))
  748:       (goto-line (nth 1 fd))
  749:       (if (not (eq (nth 1 fd) (1+ (count-lines (point-min) (point)))))
  750: 	  (error "forth-get-doc-string: serious error"))
  751:       (if (not (re-search-backward "\n[\t ]*\n" nil t))
  752: 	  (goto-char (point-min))
  753: 	(goto-char (match-end 0)))
  754:       (let ((p (point)))
  755: 	(if (not (re-search-forward "\n[\t ]*\n" nil t))
  756: 	    (goto-char (point-max)))
  757: 	(setq result (buffer-substring p (point))))
  758:       (bury-buffer (current-buffer)))
  759:     result))
  760: 
  761: (defun forth-get-file-data (limit)
  762:   "Parse grep output and return '(filename line#) list. Return nil when
  763:  passing limit."
  764:   (forth-skip-error-lines)
  765:   (if (< (point) limit)
  766:       (let ((result (forth-get-file-data-cont limit)))
  767: 	(forward-line 1)
  768: 	(beginning-of-line)
  769: 	result)))
  770: 
  771: (defun forth-get-file-data-cont (limit)
  772:   (let (result)
  773:     (let ((p (point)))
  774:       (skip-chars-forward "^:")
  775:       (setq result (buffer-substring p (point))))
  776:     (if (< (point) limit)
  777: 	(let ((p (1+ (point))))
  778: 	  (forward-char 1)
  779: 	  (skip-chars-forward "^:")
  780: 	  (list result (string-to-int (buffer-substring p (point))))))))
  781: 
  782: (defun grep-regexp-quote (str)
  783:   (let ((i 0) (m 1) (res ""))
  784:     (while (/= m 0)
  785:       (setq m (string-to-char (substring str i)))
  786:       (if (/= m 0)
  787: 	  (progn
  788: 	    (setq i (1+ i))
  789: 	    (if (string-match (regexp-quote (char-to-string m))
  790: 			      ".*\\^$[]")
  791: 		(setq res (concat res "\\")))
  792: 	    (setq res (concat res (char-to-string m))))))
  793:     res))
  794: 
  795: 
  796: (define-key forth-mode-map "\C-x\C-e" 'forth-compile)
  797: (define-key forth-mode-map "\C-x\C-n" 'next-error)
  798: (require 'compile "compile")
  799: 
  800: (defvar forth-compile-command "forth ")
  801: (defvar forth-compilation-window-percent-height 30)
  802: 
  803: (defun forth-compile (command)
  804:   (interactive (list (setq forth-compile-command (read-string "Compile command: " forth-compile-command))))
  805:   (forth-split-1 "*compilation*")
  806:   (setq ctools-compile-command command)
  807:   (compile1 ctools-compile-command "No more errors"))
  808: 
  809: 

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