--- /dev/null
+;;;; readline.scm --- support functions for command-line editing
+;;;;
+;;;; Copyright (C) 1997, 1999, 2000, 2001, 2002, 2006 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., 51 Franklin Street, Fifth Floor,
+;;;; Boston, MA 02110-1301 USA
+;;;;
+;;;; Contributed by Daniel Risacher <risacher@worldnet.att.net>.
+;;;; Extensions based upon code by
+;;;; Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>.
+
+\f
+
+(define-module (ice-9 readline)
+ :use-module (ice-9 session)
+ :use-module (ice-9 regex)
+ :use-module (ice-9 buffered-input)
+ :no-backtrace
+ :export (filename-completion-function))
+
+\f
+
+;;; Dynamically link the glue code for accessing the readline library,
+;;; but only when it isn't already present.
+
+(if (not (provided? 'readline))
+ (load-extension "libguilereadline-v-17" "scm_init_readline"))
+
+(if (not (provided? 'readline))
+ (scm-error 'misc-error
+ #f
+ "readline is not provided in this Guile installation"
+ '()
+ '()))
+
+\f
+
+;;; Run-time options
+
+(export
+ readline-options
+ readline-enable
+ readline-disable)
+(export-syntax
+ readline-set!)
+
+(define-option-interface
+ (readline-options-interface
+ (readline-options readline-enable readline-disable)
+ (readline-set!)))
+
+\f
+
+;;; MDJ 980513 <djurfeldt@nada.kth.se>:
+;;; There should probably be low-level support instead of this code.
+
+;;; Dirk:FIXME:: If the-readline-port, input-port or output-port are closed,
+;;; guile will enter an endless loop or crash.
+
+(define prompt "")
+(define prompt2 "")
+(define input-port (current-input-port))
+(define output-port (current-output-port))
+(define read-hook #f)
+
+(define (make-readline-port)
+ (make-line-buffered-input-port (lambda (continuation?)
+ (let* ((prompt (if continuation?
+ prompt2
+ prompt))
+ (str (%readline (if (string? prompt)
+ prompt
+ (prompt))
+ input-port
+ output-port
+ read-hook)))
+ (or (eof-object? str)
+ (string=? str "")
+ (add-history str))
+ str))))
+
+;;; We only create one readline port. There's no point in having
+;;; more, since they would all share the tty and history ---
+;;; everything except the prompt. And don't forget the
+;;; compile/load/run phase distinctions. Also, the readline library
+;;; isn't reentrant.
+(define the-readline-port #f)
+
+(define history-variable "GUILE_HISTORY")
+(define history-file (string-append (getenv "HOME") "/.guile_history"))
+
+(define-public readline-port
+ (let ((do (lambda (r/w)
+ (if (memq 'history-file (readline-options-interface))
+ (r/w (or (getenv history-variable)
+ history-file))))))
+ (lambda ()
+ (if (not the-readline-port)
+ (begin
+ (do read-history)
+ (set! the-readline-port (make-readline-port))
+ (add-hook! exit-hook (lambda ()
+ (do write-history)
+ (clear-history)))))
+ the-readline-port)))
+
+;;; The user might try to use readline in his programs. It then
+;;; becomes very uncomfortable that the current-input-port is the
+;;; readline port...
+;;;
+;;; Here, we detect this situation and replace it with the
+;;; underlying port.
+;;;
+;;; %readline is the low-level readline procedure.
+
+(define-public (readline . args)
+ (let ((prompt prompt)
+ (inp input-port))
+ (cond ((not (null? args))
+ (set! prompt (car args))
+ (set! args (cdr args))
+ (cond ((not (null? args))
+ (set! inp (car args))
+ (set! args (cdr args))))))
+ (apply %readline
+ prompt
+ (if (eq? inp the-readline-port)
+ input-port
+ inp)
+ args)))
+
+(define-public (set-readline-prompt! p . rest)
+ (set! prompt p)
+ (if (not (null? rest))
+ (set! prompt2 (car rest))))
+
+(define-public (set-readline-input-port! p)
+ (cond ((or (not (file-port? p)) (not (input-port? p)))
+ (scm-error 'wrong-type-arg "set-readline-input-port!"
+ "Not a file input port: ~S" (list p) #f))
+ ((port-closed? p)
+ (scm-error 'misc-error "set-readline-input-port!"
+ "Port not open: ~S" (list p) #f))
+ (else
+ (set! input-port p))))
+
+(define-public (set-readline-output-port! p)
+ (cond ((or (not (file-port? p)) (not (output-port? p)))
+ (scm-error 'wrong-type-arg "set-readline-input-port!"
+ "Not a file output port: ~S" (list p) #f))
+ ((port-closed? p)
+ (scm-error 'misc-error "set-readline-output-port!"
+ "Port not open: ~S" (list p) #f))
+ (else
+ (set! output-port p))))
+
+(define-public (set-readline-read-hook! h)
+ (set! read-hook h))
+
+(if (provided? 'regex)
+ (begin
+ (define-public apropos-completion-function
+ (let ((completions '()))
+ (lambda (text cont?)
+ (if (not cont?)
+ (set! completions
+ (map symbol->string
+ (apropos-internal
+ (string-append "^" (regexp-quote text))))))
+ (if (null? completions)
+ #f
+ (let ((retval (car completions)))
+ (begin (set! completions (cdr completions))
+ retval))))))
+
+ (set! *readline-completion-function* apropos-completion-function)
+ ))
+
+(define-public (with-readline-completion-function completer thunk)
+ "With @var{completer} as readline completion function, call @var{thunk}."
+ (let ((old-completer *readline-completion-function*))
+ (dynamic-wind
+ (lambda ()
+ (set! *readline-completion-function* completer))
+ thunk
+ (lambda ()
+ (set! *readline-completion-function* old-completer)))))
+
+(define-public (activate-readline)
+ (if (and (isatty? (current-input-port))
+ (not (let ((guile-user-module (resolve-module '(guile-user))))
+ (and (module-defined? guile-user-module 'use-emacs-interface)
+ (module-ref guile-user-module 'use-emacs-interface)))))
+ (let ((read-hook (lambda () (run-hook before-read-hook))))
+ (set-current-input-port (readline-port))
+ (set! repl-reader
+ (lambda (prompt)
+ (dynamic-wind
+ (lambda ()
+ (set-buffered-input-continuation?! (readline-port) #f)
+ (set-readline-prompt! prompt "... ")
+ (set-readline-read-hook! read-hook))
+ (lambda () (read))
+ (lambda ()
+ (set-readline-prompt! "" "")
+ (set-readline-read-hook! #f)))))
+ (set! (using-readline?) #t))))
+
+(define-public (make-completion-function strings)
+ "Construct and return a completion function for a list of strings.
+The returned function is suitable for passing to
+@code{with-readline-completion-function. The argument @var{strings}
+should be a list of strings, where each string is one of the possible
+completions."
+ (letrec ((strs '())
+ (regexp #f)
+ (completer (lambda (text continue?)
+ (if continue?
+ (if (null? strs)
+ #f
+ (let ((str (car strs)))
+ (set! strs (cdr strs))
+ (if (string-match regexp str)
+ str
+ (completer text #t))))
+ (begin
+ (set! strs strings)
+ (set! regexp
+ (string-append "^" (regexp-quote text)))
+ (completer text #t))))))
+ completer))
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