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- ;;;; readline.scm --- support functions for command-line editing
- ;;;;
- ;;;; Copyright (C) 1997, 1999, 2000, 2001 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
- ;;;;
- ;;;; 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)
-
-
-
- ;;; Dynamically link the glue code for accessing the readline library,
- ;;; but only when it isn't already present.
-
- (if (not (feature? 'readline))
- (dynamic-call "scm_init_readline"
- (dynamic-link "libguilereadline-v-12")))
-
- (if (not (feature? '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 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 (feature? '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 (and (module-defined? the-root-module 'use-emacs-interface)
- (module-ref the-root-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))))
-