-;;;; 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>.
-
-\f
-
-(define-module (ice-9 readline)
- :use-module (ice-9 session)
- :use-module (ice-9 regex)
- :use-module (ice-9 buffered-input)
- :no-backtrace)
-
-\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" "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 (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))))
HCoop / bpt / guile.git / commitdiff