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205 lines
6.6 KiB
Scheme
205 lines
6.6 KiB
Scheme
;;;; readline.scm --- support functions for command-line editing
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;;;;
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;;;; Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
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;;;;
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;;;; This program is free software; you can redistribute it and/or modify
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;;;; it under the terms of the GNU General Public License as published by
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;;;; the Free Software Foundation; either version 2, or (at your option)
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;;;; any later version.
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;;;;
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;;;; This program is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;;;; GNU General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU General Public License
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;;;; along with this software; see the file COPYING. If not, write to
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;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
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;;;; Boston, MA 02111-1307 USA
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;;;;
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;;;; Contributed by Daniel Risacher <risacher@worldnet.att.net>.
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;;;; Extensions based upon code by
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;;;; Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>.
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(define-module (ice-9 readline)
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:use-module (ice-9 session)
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:use-module (ice-9 regex)
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:use-module (ice-9 buffered-input)
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:no-backtrace)
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;;; Dynamically link the glue code for accessing the readline library,
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;;; but only when it isn't already present.
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(if (not (feature? 'readline))
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(dynamic-call "scm_init_readline" (dynamic-link "libguilereadline.so")))
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(if (not (feature? 'readline))
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(scm-error 'misc-error
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#f
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"readline is not provided in this Guile installation"
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'()
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'()))
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;;; Run-time options
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(export
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readline-options
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readline-enable
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readline-disable)
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(export-syntax
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readline-set!)
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(define-option-interface
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(readline-options-interface
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(readline-options readline-enable readline-disable)
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(readline-set!)))
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;;; MDJ 980513 <djurfeldt@nada.kth.se>:
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;;; There should probably be low-level support instead of this code.
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;;; Dirk:FIXME:: If the-readline-port, input-port or output-port are closed,
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;;; guile will enter an endless loop or crash.
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(define prompt "")
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(define prompt2 "")
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(define input-port (current-input-port))
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(define output-port (current-output-port))
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(define read-hook #f)
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(define (make-readline-port)
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(make-line-buffered-input-port (lambda (continuation?)
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(let* ((prompt (if continuation?
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prompt2
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prompt))
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(str (%readline (if (string? prompt)
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prompt
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(prompt))
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input-port
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output-port
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read-hook)))
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(or (eof-object? str)
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(string=? str "")
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(add-history str))
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str))))
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;;; We only create one readline port. There's no point in having
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;;; more, since they would all share the tty and history ---
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;;; everything except the prompt. And don't forget the
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;;; compile/load/run phase distinctions. Also, the readline library
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;;; isn't reentrant.
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(define the-readline-port #f)
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(define history-variable "GUILE_HISTORY")
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(define history-file (string-append (getenv "HOME") "/.guile_history"))
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(define-public readline-port
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(let ((do (lambda (r/w)
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(if (memq 'history-file (readline-options-interface))
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(r/w (or (getenv history-variable)
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history-file))))))
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(lambda ()
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(if (not the-readline-port)
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(begin
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(do read-history)
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(set! the-readline-port (make-readline-port))
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(add-hook! exit-hook (lambda () (do write-history)))))
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the-readline-port)))
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;;; The user might try to use readline in his programs. It then
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;;; becomes very uncomfortable that the current-input-port is the
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;;; readline port...
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;;;
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;;; Here, we detect this situation and replace it with the
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;;; underlying port.
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;;;
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;;; %readline is the low-level readline procedure.
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(define-public (readline . args)
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(let ((prompt prompt)
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(inp input-port))
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(cond ((not (null? args))
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(set! prompt (car args))
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(set! args (cdr args))
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(cond ((not (null? args))
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(set! inp (car args))
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(set! args (cdr args))))))
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(apply %readline
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prompt
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(if (eq? inp the-readline-port)
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input-port
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inp)
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args)))
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(define-public (set-readline-prompt! p . rest)
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(set! prompt p)
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(if (not (null? rest))
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(set! prompt2 (car rest))))
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(define-public (set-readline-input-port! p)
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(cond ((or (not (file-port? p)) (not (input-port? p)))
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(scm-error 'wrong-type-arg "set-readline-input-port!"
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"Not a file input port: ~S" (list p) #f))
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((port-closed? p)
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(scm-error 'misc-error "set-readline-input-port!"
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"Port not open: ~S" (list p) #f))
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(else
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(set! input-port p))))
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(define-public (set-readline-output-port! p)
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(cond ((or (not (file-port? p)) (not (output-port? p)))
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(scm-error 'wrong-type-arg "set-readline-input-port!"
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"Not a file output port: ~S" (list p) #f))
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((port-closed? p)
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(scm-error 'misc-error "set-readline-output-port!"
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"Port not open: ~S" (list p) #f))
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(else
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(set! output-port p))))
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(define-public (set-readline-read-hook! h)
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(set! read-hook h))
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(if (feature? 'regex)
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(begin
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(define-public apropos-completion-function
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(let ((completions '()))
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(lambda (text cont?)
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(if (not cont?)
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(set! completions
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(map symbol->string
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(apropos-internal
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(string-append "^" (regexp-quote text))))))
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(if (null? completions)
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#f
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(let ((retval (car completions)))
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(begin (set! completions (cdr completions))
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retval))))))
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(set! *readline-completion-function* apropos-completion-function)
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))
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(define-public (activate-readline)
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(if (and (isatty? (current-input-port))
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(not (and (module-defined? the-root-module 'use-emacs-interface)
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(module-ref the-root-module 'use-emacs-interface))))
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(let ((read-hook (lambda () (run-hook before-read-hook))))
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(set-current-input-port (readline-port))
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(set! repl-reader
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(lambda (prompt)
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(dynamic-wind
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(lambda ()
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(set-buffered-input-continuation?! (readline-port) #f)
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(set-readline-prompt! prompt "... ")
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(set-readline-read-hook! read-hook))
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(lambda () (read))
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(lambda ()
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(set-readline-prompt! "" "")
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(set-readline-read-hook! #f)))))
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(set! (using-readline?) #t))))
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