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;;;; 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>.
(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))
;;; 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-18" "scm_init_readline"))
(if (not (provided? 'readline))
(scm-error 'misc-error
#f
"readline is not provided in this Guile installation"
'()
'()))
;;; 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!)))
;;; 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 new-input-prompt "")
(define continuation-prompt "")
(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?
continuation-prompt
new-input-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 new-input-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! new-input-prompt p)
(if (not (null? rest))
(set! continuation-prompt (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 ((repl-read-hook (lambda () (run-hook before-read-hook))))
(set-current-input-port (readline-port))
(set! repl-reader
(lambda (repl-prompt)
(let ((outer-new-input-prompt new-input-prompt)
(outer-continuation-prompt continuation-prompt)
(outer-read-hook read-hook))
(dynamic-wind
(lambda ()
(set-buffered-input-continuation?! (readline-port) #f)
(set-readline-prompt! repl-prompt "... ")
(set-readline-read-hook! repl-read-hook))
(lambda () (read))
(lambda ()
(set-readline-prompt! outer-new-input-prompt outer-continuation-prompt)
(set-readline-read-hook! outer-read-hook))))))
(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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