/usr/share/guile-gnome-2/gnome/gtk/graphical-repl.scm is in guile-gnome2-gtk 2.16.2-1.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; Copyright (C) 2001, 2009 Neil Jerram <neil@ossau.uklinux.net>
;; Copyright (C) 2003,2004 Andy Wingo <wingo at pobox dot com>
;; 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 of
;; the License, 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 program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;;A class for a graphical REPL. For the moment, see repl.scm in the
;;examples directory for documentation.
;;
;;; Code:
(define-module (gnome gtk graphical-repl)
#:use-module (ice-9 buffered-input)
#:use-module (ice-9 rdelim)
#:use-module (ice-9 session) ;; for the completer
#:use-module (ice-9 regex) ;; for the completer
#:use-module (oop goops)
#:use-module (gnome gobject)
#:use-module (gnome glib)
#:use-module (gnome gtk)
#:use-module (gnome pango)
#:use-module (gnome gtk gdk-event)
#:export (<guile-gtk-repl> <gtk-buffer-output-port>
construct-view guile-gtk-repl))
(define-class <repl-paren-matching-style> (<gflags>)
#:vtable #((move-cursor "Move cursor" 1)
(highlight-region "Highlight region" 2)))
(define-class <guile-gtk-repl-entry> (<gtk-entry>)
new-read-hook
read-complete-hook
main-loop
(port
#:gparam `(,<gparam-boxed> #:boxed-type ,<gboxed-scm> #:flags (read)))
(paren-matching-style
#:gparam `(,<gparam-flags> #:flags-type ,<repl-paren-matching-style>
#:default-value 1 ;; arrg
#:flags (read write construct)))
#:gsignal `(complete #f ,<gchararray> ,<gboxed-scm>))
(define (find-matching-open str pos)
(let ((reversed-str (let loop ((pos pos)
(chars '()))
(if (< pos 0)
(list->string (reverse! chars))
(loop (- pos 1)
(let ((c (string-ref str pos)))
(case c
((#\()
(cons #\) chars))
((#\))
(cons #\( chars))
((#\\)
(set-car! chars #\x)
(cons #\x chars))
(else
(cons c chars)))))))))
(if (char=? (string-ref reversed-str 0) #\()
(with-input-from-string reversed-str
(lambda ()
(let ((x (false-if-exception (read))))
(cond ((eof-object? x) #f)
(x (- (string-length reversed-str)
(port-column (current-input-port))))
(else #f)))))
#f)))
(define (install-paren-matching-handlers entry)
(letrec ((saved-pos #f)
(restore-text (lambda args
(if saved-pos
(begin
(select-region entry 0 0)
(set-position entry saved-pos)
(set! saved-pos #f)))
#f)))
;; This handler runs before insertion and checks whether the
;; character to be inserted is a closing parenthesis. If so, it
;; moves the cursor and/or highlights the matching region, and
;; installs a timeout to restore the entry contents after half a
;; second.
(connect-after entry
'insert-text
;; The position passed to this handler is an in-out
;; gint*. That's broken. Why not just a GValue?
(lambda (entry text length in-out-new-pos)
(let ((style (gflags->symbol-list (slot-ref entry
'paren-matching-style)))
(str (get-text entry))
(pos (get-position entry))) ;; before insertion
(if (and (eq? length 1) (char=? (string-ref text 0) #\)))
(let ((open-pos (find-matching-open str pos)))
(if open-pos
(begin
(set! saved-pos (1+ pos))
(if (memq 'move-cursor style)
;; We can't call set-position here
;; because the in-out position will
;; obviate our settings. So do it in
;; an idle callback (grr).
(g-idle-add (lambda () (set-position entry open-pos) #f)))
(if (memq 'highlight-region style)
(select-region entry open-pos (1+ pos)))
(g-timeout-add 500 restore-text))))))))
;; This handler restores the entry contents early in the event of
;; a key press occurring before the above timer pops.
(connect entry 'key-press-event restore-text)))
(define (install-history-handlers entry)
(let ((history '())
(position -1)
(non-history-line "--should never see this--")
(handler #f)
(new-read-hook (slot-ref entry 'new-read-hook))
(read-complete-hook (slot-ref entry 'read-complete-hook)))
(define (history-up)
(if (< (+ position 1) (length history))
(begin
(if (< position 0)
(set! non-history-line (get entry 'text)))
(set! position (+ position 1))
(let ((text (list-ref history position)))
(set entry 'text text)
(set-position entry (string-length text))))))
(define (history-down)
(if (>= position 0)
(begin
(set! position (- position 1))
(set entry 'text
(if (negative? position)
non-history-line
(list-ref history position))))))
(connect entry
'key-press-event
(lambda (entry event)
(let ((keyval (gdk-event-key:keyval event)))
(cond ((or (eq? keyval gdk:Up)
(eq? keyval gdk:KP-Up))
(history-up) #t)
((or (eq? keyval gdk:Down)
(eq? keyval gdk:KP-Down))
(history-down) #t)
(else #f)))))
(add-hook! read-complete-hook
(lambda (str)
(if (not (string=? str ""))
(set! history (cons str history)))
(set! position -1)))
(catch #t
(lambda ()
(let ((history-file (or (getenv "GUILE_HISTORY")
(string-append (passwd:dir (getpwuid (getuid)))
"/.guile_history"))))
(with-input-from-file history-file
(lambda ()
(let lp ((out '()) (line (read-line)))
(if (eof-object? line)
(set! history out)
(lp (cons line out) (read-line))))))
(let ((old history))
(add-hook! exit-hook
(lambda ()
(with-output-to-port (open-file history-file "a")
(lambda ()
(for-each write-line
(let lp ((in history) (out '()))
(if (eq? in old)
out
(lp (cdr in) (cons (car in) out))))))))))))
noop)))
(define complete
(if (provided? 'regex)
(lambda (text)
(map symbol->string
(apropos-internal
(string-append "^" (regexp-quote text)))))
(lambda (text)
'())))
(define (do-completion entry)
;; `extended' is from r5rs
(let* ((pos (get-position entry))
(head (get-chars entry 0 pos))
(text (let ((extended (string->list "!$%&*+-./:<=>?@^_~")))
(let loop ((in (reverse (string->list head)))
(out '()))
(if (or (null? in)
(not (or (char-alphabetic? (car in))
(char-numeric? (car in))
(memq (car in) extended))))
(list->string out)
(loop (cdr in) (cons (car in) out))))))
(completions (complete text))
(common (if (null? completions)
""
(let loop ((l completions) (index 0) (ch #f))
(cond
((null? l)
(loop completions (1+ index) #f))
((< index (string-length (car l)))
(if ch
(if (eq? (string-ref (car l) index) ch)
(loop (cdr l) index ch)
(substring (car completions) 0 index))
(loop (cdr l) index (string-ref (car l) index))))
(else
(substring (car completions) 0 index)))))))
(if (> (string-length common) (string-length head))
(set-position entry
(insert-text
entry
(string-append
(substring common (string-length text))
(if (eq? (length completions) 1)
" "
""))
pos))
(emit entry 'complete head (sort-list completions string<?)))))
(define-method (initialize (entry <guile-gtk-repl-entry>) initargs)
(next-method)
(slot-set! entry 'new-read-hook (make-hook))
(slot-set! entry 'read-complete-hook (make-hook 1))
(slot-set! entry 'main-loop #f)
(let ((return-from-read #f)
(new-read-hook (slot-ref entry 'new-read-hook))
(read-complete-hook (slot-ref entry 'read-complete-hook)))
(slot-set! entry 'port
(make-line-buffered-input-port
(lambda (continuation?)
(run-hook new-read-hook)
(let ((read-string #f)
(main-loop (or (slot-ref entry 'main-loop)
(g-main-loop-new #f #f))))
(set! return-from-read
(lambda (x)
(set! read-string x)
(g-main-loop-quit main-loop)))
(g-main-loop-run main-loop)
read-string))))
(modify-font entry (pango-font-description-from-string "Monospace"))
;; Define a new-read hook procedure that prepares the entry.
(add-hook! new-read-hook
(lambda ()
(set entry 'sensitive #t)
(grab-focus entry)))
;; Define a read-complete hook procedure that clears the entry
;; field and makes it insensitive.
(add-hook! read-complete-hook
(lambda (str)
(set entry 'sensitive #f)
(set entry 'text "")))
;; When the user presses RETURN, run the read-complete hook and
;; return the string to the continuation.
(connect entry
'activate
(lambda (entry)
(if return-from-read
(let ((str (get entry 'text)))
(run-hook read-complete-hook str)
(return-from-read str))
(warn "no return-from-read!"))))
;; These keypresses can't be caught by the parent window,
;; apparently...
(connect entry 'key-press-event
(lambda (entry event)
(let ((keyval (gdk-event-key:keyval event))
(modifiers (gdk-event-key:modifiers event)))
(cond
;; Turn Ctrl-C into SIGINT
((and (memq 'control-mask modifiers)
(eq? keyval gdk:c))
(kill (getpid) SIGINT)
#f)
((eq? keyval gdk:Tab)
(do-completion entry)
#t)
(else
#f)))))
(install-paren-matching-handlers entry)
(install-history-handlers entry)))
(define-class <gtk-buffer-output-port> (<gtk-text-buffer>)
(port
#:gparam `(,<gparam-boxed> #:boxed-type ,<gboxed-scm> #:flags (read))))
(define-method (initialize (output <gtk-buffer-output-port>) initargs)
(define (output-string str)
(let ((end (get-end-iter output)))
(insert output end str)))
(next-method)
(slot-set! output 'port
(make-soft-port (vector (lambda (char)
(output-string (string char)))
output-string
#f
#f
#f)
"w")))
(define-method (construct-view (buffer <gtk-buffer-output-port>))
(let ((view (make <gtk-text-view>
#:editable #f #:cursor-visible #f #:can-focus #f
#:wrap-mode 'char)))
(modify-font view (pango-font-description-from-string "Monospace"))
(set-buffer view buffer)
(let ((mark (create-mark buffer "end" (get-end-iter buffer) #f)))
(connect buffer 'changed
(lambda (buf)
(scroll-to-mark view mark 0.0 #t 0.0 1.0))))
view))
(define-class <guile-gtk-repl> (<gtk-vbox>)
entry
output
scrolled
output-view
(in-port
#:gparam `(,<gparam-boxed> #:boxed-type ,<gboxed-scm>))
(out-port
#:gparam `(,<gparam-boxed> #:boxed-type ,<gboxed-scm>)))
(define-method (gobject:get-property (obj <guile-gtk-repl>) (prop <symbol>))
(case prop
((in-port) (get (slot-ref obj 'entry) 'port))
((out-port) (get (slot-ref obj 'output) 'port))))
(define (pretty-display-strings scm width)
(let* ((max-length (1+ (apply max (map string-length scm))))
(num-cols (inexact->exact (floor (/ width max-length))))
(col-width (inexact->exact (floor (/ width num-cols)))))
(let loop ((l scm) (col 0))
(if (not (null? l))
(let* ((str (car l))
(len (string-length str))
(next-col (modulo (1+ col) num-cols)))
(display str)
(if (zero? next-col)
(if (not (null? (cdr l)))
(newline))
(display (make-string (- col-width len) #\space)))
(loop (cdr l) next-col))))))
(define-method (initialize (obj <guile-gtk-repl>) initargs)
(next-method)
(slot-set! obj 'entry (make <guile-gtk-repl-entry>))
(slot-set! obj 'output (make <gtk-buffer-output-port>))
(slot-set! obj 'scrolled (make <gtk-scrolled-window>
#:hscrollbar-policy 'never
#:vscrollbar-policy 'always))
(slot-set! obj 'output-view (construct-view (slot-ref obj 'output)))
(let ((entry (slot-ref obj 'entry))
(output (slot-ref obj 'output))
(scrolled (slot-ref obj 'scrolled))
(view (slot-ref obj 'output-view)))
;; Install some nice keybindings
(connect obj 'key-press-event
(lambda (obj event)
(let ((keyval (gdk-event-key:keyval event))
(modifiers (gdk-event-key:modifiers event)))
(cond
;; Page-Up/Down to move the view -- this is broken,
;; need to wrap GtkAdjustment better
((or (eq? keyval gdk:Page-Up) (eq? keyval gdk:Page-Down))
(let* ((adjustment (get scrolled 'vadjustment))
(new-value ((if (eq? keyval gdk:Page-Up) + -)
0.1 (get-value adjustment))))
;; 0.1 is a hack, cause adjustments don't have properties
(set-value adjustment
(if (< new-value 0) 0 (if (> new-value 1) 1 new-value))))
#f)
(else
#f)))))
(add-hook! (slot-ref entry 'read-complete-hook)
(lambda (str)
(display str (get output 'port))
(newline (get output 'port))))
(connect entry 'complete
(lambda (entry text completions)
(with-output-to-port (get output 'port)
(lambda ()
(with-error-to-port (get output 'port)
(lambda ()
(display text) (newline)
(if (null? completions)
(display "[no completions]")
(pretty-display-strings completions 70))
;; We don't really know how big the window is,
;; unfortunately
(newline)
(display scm-repl-prompt)))))))
(pack-start obj scrolled #t #t 0)
(add scrolled view)
(for-each show (list entry scrolled view))
(pack-start obj entry #f #f 0)))
(define (guile-gtk-repl)
(let* ((w (make <gtk-window> #:title "Guile-Gtk REPL"))
(repl (make <guile-gtk-repl>))
(main-loop (g-main-loop-new #f #f))
(in-port (get repl 'in-port))
(out-port (get repl 'out-port))
(old-in-port #f)
(old-out-port #f)
(old-error-port #f)
(old-repl-reader #f))
(add w repl)
(set-default-size w 600 400)
(show-all w)
(connect w 'delete-event (lambda args (apply throw 'quit args) #f))
(dynamic-wind
(lambda ()
(set! old-in-port (set-current-input-port in-port))
(set! old-out-port (set-current-output-port out-port))
(set! old-error-port (set-current-error-port out-port))
(set! old-repl-reader repl-reader)
(set! repl-reader
(lambda (prompt . reader)
(display (if (string? prompt) prompt (prompt)))
(force-output)
(run-hook before-read-hook)
((or (and (pair? reader) (car reader))
read)
(current-input-port)))))
top-repl
(lambda ()
(set-current-input-port old-in-port)
(set-current-output-port old-out-port)
(set-current-error-port old-error-port)
(set! repl-reader old-repl-reader)))))
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