;; isabelle-system.el Interface with Isabelle system
;;
;; Copyright (C) 2000 LFCS Edinburgh, David Aspinall. 
;;
;; Author:      David Aspinall <da@dcs.ed.ac.uk>
;; Maintainer:  Proof General maintainer <proofgen@dcs.ed.ac.uk>
;;
;; $Id$
;;
;; Most of this code is taken from the final version of Isamode.
;; --------------------------------------------------------------
;;

(require 'proof)

(defconst isa-running-isar (eq proof-assistant-symbol 'isar))

;; If we're using Isabelle/Isar then the isabelle custom
;; group won't have been defined yet.
(if isa-running-isar
(defgroup isabelle nil
  "Customization of user options for Isabelle and Isabelle/Isar Proof General"
  :group 'proof-general))

(defcustom isabelle-web-page
  "http://www.cl.cam.ac.uk/Research/HVG/Isabelle/"
  ;; "http://isabelle.in.tum.de"
  ;; "http://www.dcs.ed.ac.uk/home/isabelle"
  "URL of web page for Isabelle."
  :type 'string
  :group 'isabelle)


;;; ================ Extract Isabelle settings ================

(defcustom isa-isatool-command
  (or (getenv "ISATOOL") 
      (proof-locate-executable "isatool")
      (let ((possibilities
	     '("/usr/bin/isatool"
	       "/usr/share/Isabelle/bin/isatool"
	       "/usr/local/bin/isatool"
	       "/usr/local/Isabelle/bin/isatool"
	       "/opt/bin/isatool"
	       "/opt/Isabelle/bin/isatool")))
	(while (and possibilities
		    (not (file-executable-p
			  (car possibilities))))
	  (setq possibilities (cdr possibilities)))
	(car-safe possibilities))
      "path_to_isatool_is_unknown")
  "Command to invoke Isabelle tool 'isatool'.
XEmacs should be able to find `isatool' if it is on the PATH when
started.  Then several standard locations are attempted.
Otherwise you should set this, using a full path name here for reliable 
working."
  :type 'file
  :group 'isabelle)

(defun isa-set-isatool-command ()
  "Make sure isa-isatool-command points to a valid executable.
If it does not, prompt the user for the proper setting.
If it appears we're running on win32 or FSF Emacs, we allow this to
remain unverified.
Returns non-nil if isa-isatool-command is surely an executable
with full path."
  (interactive)
  (while (unless proof-running-on-win32
	   (not (file-executable-p isa-isatool-command)))
    (beep)
    (setq isa-isatool-command
	  (read-file-name
	   "Please type in the full path to the `isatool' program: "
	   nil nil t)))
  (if (and proof-running-on-win32
	   (not (file-executable-p isa-isatool-command)))
      (warning "Proof General: isatool command not found; ignored because Win32 system detected."))
  (file-executable-p isa-isatool-command))

(defun isa-shell-command-to-string (command)
  "Like shell-command-to-string except the last character is stripped."
  ;; FIXME: sometimes the command may fail. This will usually cause PG
  ;; to break.  Bit of an effort to trap errors here, we would need
  ;; to provide some advice to shell-command-to-string to retain result
  ;; of call to call-process, and raise and error in case it failed.
  (substring (shell-command-to-string command) 0 -1))

(defun isa-getenv (envvar &optional default)
  "Extract an environment variable setting using the `isatool' program.
If the isatool command is not available, try using elisp's getenv
to extract the value from Emacs' environment.
If there is no setting for the variable, DEFAULT will be returned"
  (isa-set-isatool-command)
  (if (file-executable-p isa-isatool-command)
      (let ((setting (isa-shell-command-to-string
		      (concat isa-isatool-command
			      " getenv -b " envvar))))
	(if (string-equal setting "")
	    default
	  setting))
    (or (getenv envvar) default)))

;;;
;;; ======= Interaction with System using Isabelle tools =======
;;;

(defcustom isabelle-program-name 
  (if (fboundp 'proof-running-on-win32)	
      "C:\\sml\\bin\\.run\\run.x86-win32.exe @SMLload=C:\\Isabelle\\"
    (proof-locate-executable "isabelle" t))
  "*Default name of program to run Isabelle.

The default value except when running under Windows is \"isabelle\",
which will get expanded using PATH if possible. 

The default value when running under Windows is:

  C:\\sml\\bin\\.run\\run.x86-win32.exe @SMLload=C:\\Isabelle\\

This expects SML/NJ in C:\\sml and Isabelle images in C:\Isabelle.  
The logic image name is tagged onto the end.  

NB: The Isabelle settings mechanism or the environment variable
ISABELLE will always override this setting."
  :type 'file
  :group 'isabelle)

(defvar isabelle-prog-name isabelle-program-name
  "Set from `isabelle-program-name', has name of logic appended sometimes.")

(defun isabelle-command-line ()
  "Make proper command line for running Isabelle"
  (let*
      ;; The ISABELLE and PROOFGENERAL_LOGIC values (as set when run
      ;; under the interface wrapper script) indicate that we should
      ;; determine the proper command line from the current Isabelle
      ;; settings environment.
      ((isabelle (or
		  (getenv "ISABELLE")	; overrides default, may be updated
		  isabelle-program-name ; calculated earlier
		  "isabelle"))		; to be really sure
       (opts (if isa-running-isar " -PI" ""))
       (logic (or isabelle-chosen-logic
		  (getenv "PROOFGENERAL_LOGIC")))
       (logicarg (if (and logic (not (equal logic "")))
		     (concat " " logic) "")))
    (concat isabelle opts logicarg)))

(defun isabelle-choose-logic (logic)
  "Adjust isabelle-prog-name and proof-prog-name for running LOGIC."
  ;; a little bit obnoxious maybe (but what naive user would expect)
  ;; (customize-save-variable 'isabelle-chosen-logic logic)
  (customize-set-variable 'isabelle-chosen-logic logic)
  (setq isabelle-prog-name (isabelle-command-line))
  (setq proof-prog-name isabelle-prog-name))

(defun isa-tool-list-logics ()
  "Generate a list of available object logics."
  (if (isa-set-isatool-command)
      (split-string (isa-shell-command-to-string
		     (concat isa-isatool-command " findlogics")) "[ \t]")))

(defun isa-view-doc (docname)
  "View Isabelle document DOCNAME, using Isabelle tools."
  (if (isa-set-isatool-command)
      (apply 'start-process
	     "isa-view-doc" nil
	     (list isa-isatool-command "doc" docname))))

(defun isa-tool-list-docs ()
  "Generate a list of documentation files available, with descriptions.
This function returns a list of lists of the form
 ((DOCNAME DESCRIPTION) ....)
of Isabelle document names and descriptions.  When DOCNAME is
passed to isa-tool-doc-command, DOCNAME will be viewed."
  (if (isa-set-isatool-command)
      (let ((docs (isa-shell-command-to-string
		   (concat isa-isatool-command " doc"))))
	(unless (string-equal docs "")
	  (mapcar
	   (function (lambda (docdes)
		       (list
			(substring docdes 
				   (string-match "\\(\\S-+\\)[ \t]+" docdes)
				   (match-end 1))
			(substring docdes (match-end 0)))))
	   (split-string docs "\n"))))))

(defun isa-quit (save)
  "Quit / save the Isabelle session.
Called with one argument: t to save database, nil otherwise."
  (if (not save)
      (isa-insert-ret "quit();"))
  (comint-send-eof))

(defconst isabelle-verbatim-regexp "\\`\^VERBATIM: \\(\\(.\\|\n\\)*\\)\\'"
  "Regexp matching internal marker for verbatim command output")

(defun isabelle-verbatim (str)
  "Mark internal command for verbatim output"
  (concat "\^VERBATIM: " str))

;;; Set proof-shell-pre-interrupt-hook for PolyML 3.
(if (and
     (not proof-shell-pre-interrupt-hook)
     (string-match "\\`polyml-3" (isa-getenv "ML_SYSTEM")))
    (add-hook
     'proof-shell-pre-interrupt-hook
     (lambda () (proof-shell-insert (isabelle-verbatim "f") nil))))

;;; ==========  Utility functions ==========

(defcustom isabelle-logics-available (isa-tool-list-logics)
  "*List of logics available to use with Isabelle.
If the `isatool' program is available, this is automatically
generated with the lisp form `(isa-tool-list-logics)'."
  :type (list 'string)
  :group 'isabelle)

;; FIXME: document this one
(defcustom isabelle-chosen-logic nil
  "*Choice of logic to use with Isabelle.
If non-nil, will be added into isabelle-prog-name as default value.

NB: you have saved a new logic image, it may not appear in the choices
until Proof General is restarted."
  :type (append
	 (list 'choice)
	 (mapcar (lambda (str) (list 'const str)) isabelle-logics-available)
	 (list '(string :tag "Choose another")
	       '(const :tag "Unset (use default)" nil)))
  :group 'isabelle)

(defconst isabelle-docs-menu 
  (let ((vc '(lambda (docdes)
	       (vector (car (cdr docdes))
		       (list 'isa-view-doc (car docdes)) t))))
    (list (cons "Isabelle documentation" (mapcar vc (isa-tool-list-docs)))))
  "Isabelle documentation menu.  Constructed when PG is loaded.")


;; It's a hassle to bother trying to reconstruct this
;; dynamically like it was in Isamode, so we don't bother.

(defconst isabelle-logics-menu 
  (cons "Logics" 
	(cons
	 ["Default" 
	  (isabelle-choose-logic nil)
	  :active (not (proof-shell-live-buffer))
	  :style radio
	  :selected (not isabelle-chosen-logic)]
	 (mapcar (lambda (l) 
		   (vector l (list 'isabelle-choose-logic l)
			   :active '(not (proof-shell-live-buffer))
			   :style 'radio
			   :selected (list 'equal 'isabelle-chosen-logic l)))
		 (isa-tool-list-logics))))
  "Isabelle logics menu.  Constructed when PG is loaded.")



;;; ========== Mirroring Proof General options in Isabelle process ========

;; NB: use of defpacustom here gives  separate customizable
;; options for Isabelle and Isabelle/Isar.

(defpacustom show-types  nil
  "Whether to show types in Isabelle."
  :type 'boolean
  :setting "show_types:=%b;")

(defpacustom show-sorts  nil
  "Whether to show sorts in Isabelle."
  :type 'boolean
  :setting "show_sorts:=%b;")

(defpacustom show-consts  nil
  "Whether to show types of consts in Isabelle goals."
  :type 'boolean
  :setting "show_consts:=%b;")

(defpacustom long-names  nil
  "Whether to show fully qualified names in Isabelle."
  :type 'boolean
  :setting "long_names:=%b;")

(defpacustom trace-simplifier  nil
  "Whether to trace the Simplifier in Isabelle."
  :type 'boolean
  :setting "trace_simp:=%b;")

(defpacustom quick-and-dirty  t
  "Whether to take a few short cuts occasionally."
  :type 'boolean
  :setting "quick_and_dirty:=%b;")

(defpacustom global-timing  nil
  "Whether to enable timing in Isabelle."
  :type 'boolean
  :setting "Library.timing:=%b;")

(defpacustom print-depth  10
  "Setting for the ML print depth in Isabelle."
  :type 'integer
  :setting "print_depth %i;")

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; Generic Isabelle menu for Isabelle and Isabelle/Isar
;;

(defpgdefault menu-entries
  (append
   (if isa-running-isar
       nil
     (list ["Switch to theory" thy-find-other-file t]))
   (list isabelle-logics-menu)))

(defpgdefault help-menu-entries isabelle-docs-menu)


;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;
;; X-Symbol language configuration, and adding to completion table
;;

(defpgdefault x-symbol-language 'isabelle)

(setq proof-xsym-font-lock-keywords
      ;; fontification for tokens themselves  (FIXME: broken)
      '(("\\\\<[A-Za-z][A-Za-z0-9_']*>" (0 font-lock-type-face))))

(eval-after-load "x-symbol-isabelle"
 ;; Add x-symbol tokens to isa-completion-table and rebuild
 ;; internal completion table if completion is already active
'(progn
   (defpgdefault completion-table
     (append (proof-ass completion-table)
	     (mapcar (lambda (xsym) (nth 2 xsym))
		     x-symbol-isabelle-table)))
   (if (featurep 'completion)
       (proof-add-completions))))




(provide 'isabelle-system)
;; End of isabelle-system.el