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SGI Freeware 2002 November
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SGI Freeware 2002 November - Disc 2.iso
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fw_guile.idb
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guile
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1.4
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ice-9
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emacs.scm.z
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emacs.scm
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2002-07-08
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264 lines
;;;; Copyright (C) 1996, 1997, 1998, 1999 Free Software Foundation, Inc.
;;;;
;;;; This program 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 2, or (at your option)
;;;; any later version.
;;;;
;;;; This program 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 this software; see the file COPYING. If not, write to
;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
;;;; Boston, MA 02111-1307 USA
;;;;
;;;; The author can be reached at djurfeldt@nada.kth.se
;;;; Mikael Djurfeldt, SANS/NADA KTH, 10044 STOCKHOLM, SWEDEN
;;;; (I didn't write this!)
;;;;
;;; *********************************************************************
;;; * This is the Guile side of the Emacs interface *
;;; * Experimental hACK---the real version will be coming soon (almost) *
;;; *********************************************************************
;;; {Session support for Emacs}
;;;
(define-module (ice-9 emacs)
:use-module (ice-9 debug)
:use-module (ice-9 threads)
:use-module (ice-9 session)
:no-backtrace)
(define emacs-escape-character #\sub)
(define emacs-output-port (current-output-port))
(define (make-emacs-command char)
(let ((cmd (list->string (list emacs-escape-character char))))
(lambda ()
(display cmd emacs-output-port))))
(define enter-input-wait (make-emacs-command #\s))
(define exit-input-wait (make-emacs-command #\f))
(define enter-read-character #\r)
(define sending-error (make-emacs-command #\F))
(define sending-backtrace (make-emacs-command #\B))
(define sending-result (make-emacs-command #\x))
(define end-of-text (make-emacs-command #\.))
(define no-stack (make-emacs-command #\S))
(define no-source (make-emacs-command #\R))
;; {Error handling}
;;
(add-hook! before-backtrace-hook sending-backtrace)
(add-hook! after-backtrace-hook end-of-text)
(add-hook! before-error-hook sending-error)
(add-hook! after-error-hook end-of-text)
;; {Repl}
;;
(set-current-error-port emacs-output-port)
(add-hook! before-read-hook
(lambda ()
(enter-input-wait)
(force-output emacs-output-port)))
(add-hook! after-read-hook
(lambda ()
(exit-input-wait)
(force-output emacs-output-port)))
;;; {Misc.}
(define (make-emacs-load-port orig-port)
(letrec ((read-char-fn (lambda args
(let ((c (read-char orig-port)))
(if (eq? c #\soh)
(throw 'end-of-chunk)
c)))))
(make-soft-port
(vector #f #f #f
read-char-fn
(lambda () (close-port orig-port)))
"r")))
(set-current-input-port (make-emacs-load-port (current-input-port)))
(define (result-to-emacs exp)
(sending-result)
(write exp emacs-output-port)
(end-of-text)
(force-output emacs-output-port))
(define load-acknowledge (make-emacs-command #\l))
(define load-port (current-input-port))
(define (flush-line port)
(let loop ((c (read-char port)))
(if (not (eq? c #\nl))
(loop (read-char port)))))
(define whitespace-chars (list #\space #\tab #\nl #\np))
(define (flush-whitespace port)
(catch 'end-of-chunk
(lambda ()
(let loop ((c (read-char port)))
(cond ((eq? c the-eof-object)
(error "End of file while recieving Emacs data"))
((memq c whitespace-chars) (loop (read-char port)))
((eq? c #\;) (flush-line port) (loop (read-char port)))
(else (unread-char c port))))
#f)
(lambda args
(read-char port) ; Read final newline
#t)))
(define (emacs-load filename linum colnum module interactivep)
(set-port-filename! %%load-port filename)
(set-port-line! %%load-port linum)
(set-port-column! %%load-port colnum)
(lazy-catch #t
(lambda ()
(let loop ((endp (flush-whitespace %%load-port)))
(if (not endp)
(begin
(save-module-excursion
(lambda ()
(if module
(set-current-module (resolve-module module #f)))
(let ((result
(start-stack read-and-eval!
(read-and-eval! %%load-port))))
(if interactivep
(result-to-emacs result)))))
(loop (flush-whitespace %%load-port)))
(begin
(load-acknowledge)))
(set-port-filename! %%load-port #f))) ;reset port filename
(lambda (key . args)
(set-port-filename! %%load-port #f)
(cond ((eq? key 'end-of-chunk)
(fluid-set! the-last-stack #f)
(set! stack-saved? #t)
(scm-error 'misc-error
#f
"Incomplete expression"
'()
'()))
((eq? key 'exit))
(else
(save-stack 2)
(catch 'end-of-chunk
(lambda ()
(let loop ()
(read-char %%load-port)
(loop)))
(lambda args
#f))
(apply throw key args))))))
(define (emacs-eval-request form)
(result-to-emacs (eval form)))
;;*fixme* Not necessary to use flags no-stack and no-source
(define (get-frame-source frame)
(if (or (not (fluid-ref the-last-stack))
(>= frame (stack-length (fluid-ref the-last-stack))))
(begin
(no-stack)
#f)
(let* ((frame (stack-ref (fluid-ref the-last-stack)
(frame-number->index frame)))
(source (frame-source frame)))
(or source
(begin (no-source)
#f)))))
(define (emacs-select-frame frame)
(let ((source (get-frame-source frame)))
(if source
(let ((fname (source-property source 'filename))
(line (source-property source 'line))
(column (source-property source 'column)))
(if (and fname line column)
(list fname line column)
(begin (no-source)
'())))
'())))
(define (object->string x . method)
(with-output-to-string
(lambda ()
((if (null? method)
write
(car method))
x))))
(define (format template . rest)
(let loop ((chars (string->list template))
(result '())
(rest rest))
(cond ((null? chars) (list->string (reverse result)))
((char=? (car chars) #\%)
(loop (cddr chars)
(append (reverse
(string->list
(case (cadr chars)
((#\S) (object->string (car rest)))
((#\s) (object->string (car rest) display)))))
result)
(cdr rest)))
(else (loop (cdr chars) (cons (car chars) result) rest)))))
(define (error-args->string args)
(let ((msg (apply format (caddr args) (cadddr args))))
(if (symbol? (cadr args))
(string-append (symbol->string (cadr args))
": "
msg)
msg)))
(define (emacs-frame-eval frame form)
(let ((source (get-frame-source frame)))
(if source
(catch #t
(lambda ()
(list 'result
(object->string
(local-eval (with-input-from-string form read)
(memoized-environment source)))))
(lambda args
(list (car args)
(error-args->string args))))
(begin
(no-source)
'()))))
(define (emacs-symdoc symbol)
(if (or (not (module-bound? (current-module) symbol))
(not (procedure? (eval symbol))))
'nil
(procedure-documentation (eval symbol))))
;;; A fix to get the emacs interface to work together with the module system.
;;;
(variable-set! (builtin-variable '%%load-port) load-port)
(variable-set! (builtin-variable '%%emacs-load) emacs-load)
(variable-set! (builtin-variable '%%emacs-eval-request) emacs-eval-request)
(variable-set! (builtin-variable '%%emacs-select-frame) emacs-select-frame)
(variable-set! (builtin-variable '%%emacs-frame-eval) emacs-frame-eval)
(variable-set! (builtin-variable '%%emacs-symdoc) emacs-symdoc)
(variable-set! (builtin-variable '%%apropos-internal) apropos-internal)