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+;; Major mode for editing Prolog, and for running Prolog under Emacs
+;; Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+;; Author Masanobu UMEDA (umerin@flab.flab.fujitsu.junet)
+
+;; 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.
+
+(defvar prolog-mode-syntax-table nil)
+(defvar prolog-mode-abbrev-table nil)
+(defvar prolog-mode-map nil)
+
+(defvar prolog-consult-string "reconsult(user).\n"
+ "*(Re)Consult mode (for C-Prolog and Quintus Prolog). ")
+
+(defvar prolog-compile-string "compile(user).\n"
+ "*Compile mode (for Quintus Prolog).")
+
+(defvar prolog-eof-string "end_of_file.\n"
+ "*String that represents end of file for prolog.
+nil means send actual operaing system end of file.")
+
+(defvar prolog-indent-width 4)
+
+(if prolog-mode-syntax-table
+ ()
+ (let ((table (make-syntax-table)))
+ (modify-syntax-entry ?_ "w" table)
+ (modify-syntax-entry ?\\ "\\" table)
+ (modify-syntax-entry ?/ "." table)
+ (modify-syntax-entry ?* "." table)
+ (modify-syntax-entry ?+ "." table)
+ (modify-syntax-entry ?- "." table)
+ (modify-syntax-entry ?= "." table)
+ (modify-syntax-entry ?% "<" table)
+ (modify-syntax-entry ?< "." table)
+ (modify-syntax-entry ?> "." table)
+ (modify-syntax-entry ?\' "\"" table)
+ (setq prolog-mode-syntax-table table)))
+
+(define-abbrev-table 'prolog-mode-abbrev-table ())
+
+(defun prolog-mode-variables ()
+ (set-syntax-table prolog-mode-syntax-table)
+ (setq local-abbrev-table prolog-mode-abbrev-table)
+ (make-local-variable 'paragraph-start)
+ (setq paragraph-start (concat "^%%\\|^$\\|" page-delimiter)) ;'%%..'
+ (make-local-variable 'paragraph-separate)
+ (setq paragraph-separate paragraph-start)
+ (make-local-variable 'paragraph-ignore-fill-prefix)
+ (setq paragraph-ignore-fill-prefix t)
+ (make-local-variable 'indent-line-function)
+ (setq indent-line-function 'prolog-indent-line)
+ (make-local-variable 'comment-start)
+ (setq comment-start "%")
+ (make-local-variable 'comment-start-skip)
+ (setq comment-start-skip "%+ *")
+ (make-local-variable 'comment-column)
+ (setq comment-column 48)
+ (make-local-variable 'comment-indent-hook)
+ (setq comment-indent-hook 'prolog-comment-indent))
+
+(defun prolog-mode-commands (map)
+ (define-key map "\t" 'prolog-indent-line)
+ (define-key map "\e\C-x" 'prolog-consult-region))
+
+(if prolog-mode-map
+ nil
+ (setq prolog-mode-map (make-sparse-keymap))
+ (prolog-mode-commands prolog-mode-map))
+
+(defun prolog-mode ()
+ "Major mode for editing Prolog code for Prologs.
+Blank lines and `%%...' separate paragraphs. `%'s start comments.
+Commands:
+\\{prolog-mode-map}
+Entry to this mode calls the value of prolog-mode-hook
+if that value is non-nil."
+ (interactive)
+ (kill-all-local-variables)
+ (use-local-map prolog-mode-map)
+ (setq major-mode 'prolog-mode)
+ (setq mode-name "Prolog")
+ (prolog-mode-variables)
+ (run-hooks 'prolog-mode-hook))
+
+(defun prolog-indent-line (&optional whole-exp)
+ "Indent current line as Prolog code.
+With argument, indent any additional lines of the same clause
+rigidly along with this one (not yet)."
+ (interactive "p")
+ (let ((indent (prolog-indent-level))
+ (pos (- (point-max) (point))) beg)
+ (beginning-of-line)
+ (setq beg (point))
+ (skip-chars-forward " \t")
+ (if (zerop (- indent (current-column)))
+ nil
+ (delete-region beg (point))
+ (indent-to indent))
+ (if (> (- (point-max) pos) (point))
+ (goto-char (- (point-max) pos)))
+ ))
+
+(defun prolog-indent-level ()
+ "Compute prolog indentation level."
+ (save-excursion
+ (beginning-of-line)
+ (skip-chars-forward " \t")
+ (cond
+ ((looking-at "%%%") 0) ;Large comment starts
+ ((looking-at "%[^%]") comment-column) ;Small comment starts
+ ((bobp) 0) ;Beginning of buffer
+ (t
+ (let ((empty t) ind more less)
+ (if (looking-at ")")
+ (setq less t) ;Find close
+ (setq less nil))
+ ;; See previous indentation
+ (while empty
+ (forward-line -1)
+ (beginning-of-line)
+ (if (bobp)
+ (setq empty nil)
+ (skip-chars-forward " \t")
+ (if (not (or (looking-at "%[^%]") (looking-at "\n")))
+ (setq empty nil))))
+ (if (bobp)
+ (setq ind 0) ;Beginning of buffer
+ (setq ind (current-column))) ;Beginning of clause
+ ;; See its beginning
+ (if (looking-at "%%[^%]")
+ ind
+ ;; Real prolog code
+ (if (looking-at "(")
+ (setq more t) ;Find open
+ (setq more nil))
+ ;; See its tail
+ (end-of-prolog-clause)
+ (or (bobp) (forward-char -1))
+ (cond ((looking-at "[,(;>]")
+ (if (and more (looking-at "[^,]"))
+ (+ ind prolog-indent-width) ;More indentation
+ (max tab-width ind))) ;Same indentation
+ ((looking-at "-") tab-width) ;TAB
+ ((or less (looking-at "[^.]"))
+ (max (- ind prolog-indent-width) 0)) ;Less indentation
+ (t 0)) ;No indentation
+ )))
+ )))
+
+(defun end-of-prolog-clause ()
+ "Go to end of clause in this line."
+ (beginning-of-line 1)
+ (let* ((eolpos (save-excursion (end-of-line) (point))))
+ (if (re-search-forward comment-start-skip eolpos 'move)
+ (goto-char (match-beginning 0)))
+ (skip-chars-backward " \t")))
+
+(defun prolog-comment-indent ()
+ "Compute prolog comment indentation."
+ (cond ((looking-at "%%%") 0)
+ ((looking-at "%%") (prolog-indent-level))
+ (t
+ (save-excursion
+ (skip-chars-backward " \t")
+ (max (1+ (current-column)) ;Insert one space at least
+ comment-column)))
+ ))
+
+
+;;;
+;;; Inferior prolog mode
+;;;
+(defvar inferior-prolog-mode-map nil)
+
+;; Moved into inferior-prolog-mode
+;;(if inferior-prolog-mode-map
+;; nil
+;; (setq inferior-prolog-mode-map (copy-alist shell-mode-map))
+;; (prolog-mode-commands inferior-prolog-mode-map))
+
+(defun inferior-prolog-mode ()
+ "Major mode for interacting with an inferior Prolog process.
+
+The following commands are available:
+\\{inferior-prolog-mode-map}
+
+Entry to this mode calls the value of prolog-mode-hook with no arguments,
+if that value is non-nil. Likewise with the value of shell-mode-hook.
+prolog-mode-hook is called after shell-mode-hook.
+
+You can send text to the inferior Prolog from other buffers
+using the commands send-region, send-string and \\[prolog-consult-region].
+
+Commands:
+Tab indents for Prolog; with argument, shifts rest
+ of expression rigidly with the current line.
+Paragraphs are separated only by blank lines and '%%'. '%'s start comments.
+
+Return at end of buffer sends line as input.
+Return not at end copies rest of line to end and sends it.
+\\[shell-send-eof] sends end-of-file as input.
+\\[kill-shell-input] and \\[backward-kill-word] are kill commands, imitating normal Unix input editing.
+\\[interrupt-shell-subjob] interrupts the shell or its current subjob if any.
+\\[stop-shell-subjob] stops, likewise. \\[quit-shell-subjob] sends quit signal, likewise."
+ (interactive)
+ (kill-all-local-variables)
+ (setq major-mode 'inferior-prolog-mode)
+ (setq mode-name "Inferior Prolog")
+ (setq mode-line-process '(": %s"))
+ (prolog-mode-variables)
+ (require 'shell)
+ (if inferior-prolog-mode-map
+ nil
+ (setq inferior-prolog-mode-map (copy-alist shell-mode-map))
+ (prolog-mode-commands inferior-prolog-mode-map))
+ (use-local-map inferior-prolog-mode-map)
+ (make-local-variable 'last-input-start)
+ (setq last-input-start (make-marker))
+ (make-local-variable 'last-input-end)
+ (setq last-input-end (make-marker))
+ (make-variable-buffer-local 'shell-prompt-pattern)
+ (setq shell-prompt-pattern "^| [ ?][- ] *") ;Set prolog prompt pattern
+ (run-hooks 'shell-mode-hook 'prolog-mode-hook))
+
+(defun run-prolog ()
+ "Run an inferior Prolog process, input and output via buffer *prolog*."
+ (interactive)
+ (require 'shell)
+ (switch-to-buffer (make-shell "prolog" "prolog"))
+ (inferior-prolog-mode))
+
+(defun prolog-consult-region (compile beg end)
+ "Send the region to the Prolog process made by M-x run-prolog.
+ If COMPILE (prefix arg) is not nil,
+ use compile mode rather than consult mode."
+ (interactive "P\nr")
+ (save-excursion
+ (if compile
+ (send-string "prolog" prolog-compile-string)
+ (send-string "prolog" prolog-consult-string))
+ (send-region "prolog" beg end)
+ (send-string "prolog" "\n") ;May be unnecessary
+ (if prolog-eof-string
+ (send-string "prolog" prolog-eof-string)
+ (process-send-eof "prolog")))) ;Send eof to prolog process.
+
+(defun prolog-consult-region-and-go (compile beg end)
+ "Send the region to the inferior Prolog, and switch to *prolog* buffer.
+ If COMPILE (prefix arg) is not nil,
+ use compile mode rather than consult mode."
+ (interactive "P\nr")
+ (prolog-consult-region compile beg end)
+ (switch-to-buffer "*prolog*"))
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