1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
;;;; readline.scm --- support functions for command-line editing
;;;;
;;;; Copyright (C) 1997, 1999 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))
;;; Dynamically link the glue code for accessing the readline library
(dynamic-call "scm_init_readline" (dynamic-link "libguilereadline.so"))
;;; MDJ 980513 <djurfeldt@nada.kth.se>:
;;; There should probably be low-level support instead of this code.
(define prompt "")
(define prompt2 "")
(define input-port (current-input-port))
(define output-port (current-output-port))
(define read-hook #f)
(define (make-readline-port)
(let ((read-string "")
(string-index -1))
(letrec ((get-character
(lambda ()
(cond
((eof-object? read-string)
read-string)
((>= string-index (string-length read-string))
(begin
(set! string-index -1)
#\nl))
((= string-index -1)
(begin
(set! read-string
(%readline (if (string? prompt)
prompt
(prompt))
input-port
output-port
read-hook))
(set! string-index 0)
(if (not (eof-object? read-string))
(begin
(or (string=? read-string "")
(begin
(add-history read-string)
(set! prompt prompt2)))
(get-character))
read-string)))
(else
(let ((res (string-ref read-string string-index)))
(set! string-index (+ 1 string-index))
res))))))
(make-soft-port
(vector write-char display #f get-character #f)
"rw"))))
;;; 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)))))
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)
(set! input-port p))
(define-public (set-readline-output-port! p)
(set! output-port p))
(define-public (set-readline-read-hook! h)
(set! read-hook h))
(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 (activate-readline)
(if (and (isatty? (current-input-port))
(not (and (module-defined? the-root-module
'use-emacs-interface)
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-readline-prompt! prompt "... ")
(set-readline-read-hook! read-hook))
(lambda () (read))
(lambda ()
(set-readline-prompt! "" "")
(set-readline-read-hook! #f)))))
(set! (using-readline?) #t))))
|