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b18c7b77 MV |
1 | ;;;; readline.scm --- support functions for command-line editing |
2 | ;;;; | |
ebfa2cd5 | 3 | ;;;; Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc. |
b18c7b77 MV |
4 | ;;;; |
5 | ;;;; This program is free software; you can redistribute it and/or modify | |
6 | ;;;; it under the terms of the GNU General Public License as published by | |
7 | ;;;; the Free Software Foundation; either version 2, or (at your option) | |
8 | ;;;; any later version. | |
9 | ;;;; | |
10 | ;;;; This program is distributed in the hope that it will be useful, | |
11 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 | ;;;; GNU General Public License for more details. | |
14 | ;;;; | |
15 | ;;;; You should have received a copy of the GNU General Public License | |
16 | ;;;; along with this software; see the file COPYING. If not, write to | |
17 | ;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330, | |
18 | ;;;; Boston, MA 02111-1307 USA | |
19 | ;;;; | |
20 | ;;;; Contributed by Daniel Risacher <risacher@worldnet.att.net>. | |
21 | ;;;; Extensions based upon code by | |
22 | ;;;; Andrew Archibald <aarchiba@undergrad.math.uwaterloo.ca>. | |
23 | ||
e9bab9df DH |
24 | \f |
25 | ||
b18c7b77 MV |
26 | (define-module (ice-9 readline) |
27 | :use-module (ice-9 session) | |
c8fac0c3 MD |
28 | :use-module (ice-9 regex) |
29 | :no-backtrace) | |
b18c7b77 | 30 | |
e9bab9df DH |
31 | \f |
32 | ||
acb0207f MV |
33 | ;;; Dynamically link the glue code for accessing the readline library, |
34 | ;;; but only when it isn't already present. | |
b18c7b77 | 35 | |
acb0207f MV |
36 | (if (not (feature? 'readline)) |
37 | (dynamic-call "scm_init_readline" (dynamic-link "libguilereadline.so"))) | |
b18c7b77 | 38 | |
c8fac0c3 MD |
39 | (if (not (feature? 'readline)) |
40 | (scm-error 'misc-error | |
41 | #f | |
42 | "readline is not provided in this Guile installation" | |
43 | '() | |
44 | '())) | |
45 | ||
e9bab9df DH |
46 | \f |
47 | ||
48 | ;;; Run-time options | |
49 | ||
50 | (export | |
51 | readline-options | |
52 | readline-enable | |
53 | readline-disable) | |
54 | (export-syntax | |
55 | readline-set!) | |
56 | ||
57 | (define-option-interface | |
58 | (readline-options-interface | |
59 | (readline-options readline-enable readline-disable) | |
60 | (readline-set!))) | |
61 | ||
62 | \f | |
63 | ||
b18c7b77 MV |
64 | ;;; MDJ 980513 <djurfeldt@nada.kth.se>: |
65 | ;;; There should probably be low-level support instead of this code. | |
66 | ||
e9bab9df DH |
67 | ;;; Dirk:FIXME:: If the-readline-port, input-port or output-port are closed, |
68 | ;;; guile will enter an endless loop or crash. | |
69 | ||
b18c7b77 MV |
70 | (define prompt "") |
71 | (define prompt2 "") | |
72 | (define input-port (current-input-port)) | |
73 | (define output-port (current-output-port)) | |
74 | (define read-hook #f) | |
75 | ||
76 | (define (make-readline-port) | |
77 | (let ((read-string "") | |
78 | (string-index -1)) | |
79 | (letrec ((get-character | |
80 | (lambda () | |
81 | (cond | |
82 | ((eof-object? read-string) | |
83 | read-string) | |
84 | ((>= string-index (string-length read-string)) | |
85 | (begin | |
86 | (set! string-index -1) | |
87 | #\nl)) | |
88 | ((= string-index -1) | |
89 | (begin | |
90 | (set! read-string | |
91 | (%readline (if (string? prompt) | |
92 | prompt | |
93 | (prompt)) | |
94 | input-port | |
95 | output-port | |
96 | read-hook)) | |
97 | (set! string-index 0) | |
98 | (if (not (eof-object? read-string)) | |
99 | (begin | |
100 | (or (string=? read-string "") | |
539fdb77 | 101 | (add-history read-string)) |
b18c7b77 MV |
102 | (get-character)) |
103 | read-string))) | |
104 | (else | |
105 | (let ((res (string-ref read-string string-index))) | |
106 | (set! string-index (+ 1 string-index)) | |
539fdb77 MV |
107 | (set! prompt prompt2) |
108 | res)))))) | |
b18c7b77 | 109 | (make-soft-port |
6c29a390 NJ |
110 | (vector #f #f #f get-character #f) |
111 | "r")))) | |
b18c7b77 MV |
112 | |
113 | ;;; We only create one readline port. There's no point in having | |
114 | ;;; more, since they would all share the tty and history --- | |
115 | ;;; everything except the prompt. And don't forget the | |
116 | ;;; compile/load/run phase distinctions. Also, the readline library | |
117 | ;;; isn't reentrant. | |
118 | (define the-readline-port #f) | |
119 | ||
120 | (define history-variable "GUILE_HISTORY") | |
121 | (define history-file (string-append (getenv "HOME") "/.guile_history")) | |
122 | ||
123 | (define-public readline-port | |
124 | (let ((do (lambda (r/w) | |
125 | (if (memq 'history-file (readline-options-interface)) | |
126 | (r/w (or (getenv history-variable) | |
127 | history-file)))))) | |
128 | (lambda () | |
129 | (if (not the-readline-port) | |
130 | (begin | |
131 | (do read-history) | |
132 | (set! the-readline-port (make-readline-port)) | |
133 | (add-hook! exit-hook (lambda () (do write-history))))) | |
134 | the-readline-port))) | |
135 | ||
136 | ;;; The user might try to use readline in his programs. It then | |
137 | ;;; becomes very uncomfortable that the current-input-port is the | |
138 | ;;; readline port... | |
139 | ;;; | |
140 | ;;; Here, we detect this situation and replace it with the | |
141 | ;;; underlying port. | |
142 | ;;; | |
143 | ;;; %readline is the low-level readline procedure. | |
144 | ||
145 | (define-public (readline . args) | |
146 | (let ((prompt prompt) | |
147 | (inp input-port)) | |
148 | (cond ((not (null? args)) | |
149 | (set! prompt (car args)) | |
150 | (set! args (cdr args)) | |
151 | (cond ((not (null? args)) | |
152 | (set! inp (car args)) | |
153 | (set! args (cdr args)))))) | |
154 | (apply %readline | |
155 | prompt | |
156 | (if (eq? inp the-readline-port) | |
157 | input-port | |
158 | inp) | |
159 | args))) | |
160 | ||
161 | (define-public (set-readline-prompt! p . rest) | |
162 | (set! prompt p) | |
163 | (if (not (null? rest)) | |
164 | (set! prompt2 (car rest)))) | |
165 | ||
166 | (define-public (set-readline-input-port! p) | |
c4a9b7bb DH |
167 | (cond ((or (not (file-port? p)) (not (input-port? p))) |
168 | (scm-error 'wrong-type-arg "set-readline-input-port!" | |
169 | "Not a file input port: ~S" (list p) #f)) | |
170 | ((port-closed? p) | |
171 | (scm-error 'misc-error "set-readline-input-port!" | |
172 | "Port not open: ~S" (list p) #f)) | |
173 | (else | |
174 | (set! input-port p)))) | |
b18c7b77 MV |
175 | |
176 | (define-public (set-readline-output-port! p) | |
c4a9b7bb DH |
177 | (cond ((or (not (file-port? p)) (not (output-port? p))) |
178 | (scm-error 'wrong-type-arg "set-readline-input-port!" | |
179 | "Not a file output port: ~S" (list p) #f)) | |
180 | ((port-closed? p) | |
181 | (scm-error 'misc-error "set-readline-output-port!" | |
182 | "Port not open: ~S" (list p) #f)) | |
183 | (else | |
184 | (set! output-port p)))) | |
b18c7b77 MV |
185 | |
186 | (define-public (set-readline-read-hook! h) | |
187 | (set! read-hook h)) | |
188 | ||
ebfa2cd5 MD |
189 | (if (feature? 'regex) |
190 | (begin | |
191 | (define-public apropos-completion-function | |
192 | (let ((completions '())) | |
193 | (lambda (text cont?) | |
194 | (if (not cont?) | |
195 | (set! completions | |
196 | (map symbol->string | |
197 | (apropos-internal | |
198 | (string-append "^" (regexp-quote text)))))) | |
199 | (if (null? completions) | |
200 | #f | |
201 | (let ((retval (car completions))) | |
202 | (begin (set! completions (cdr completions)) | |
203 | retval)))))) | |
204 | ||
205 | (set! *readline-completion-function* apropos-completion-function) | |
206 | )) | |
b18c7b77 MV |
207 | |
208 | (define-public (activate-readline) | |
209 | (if (and (isatty? (current-input-port)) | |
6b098fec DH |
210 | (not (and (module-defined? the-root-module 'use-emacs-interface) |
211 | (module-ref the-root-module 'use-emacs-interface)))) | |
b18c7b77 MV |
212 | (let ((read-hook (lambda () (run-hook before-read-hook)))) |
213 | (set-current-input-port (readline-port)) | |
214 | (set! repl-reader | |
215 | (lambda (prompt) | |
216 | (dynamic-wind | |
217 | (lambda () | |
218 | (set-readline-prompt! prompt "... ") | |
219 | (set-readline-read-hook! read-hook)) | |
220 | (lambda () (read)) | |
221 | (lambda () | |
222 | (set-readline-prompt! "" "") | |
6373eb6f MD |
223 | (set-readline-read-hook! #f))))) |
224 | (set! (using-readline?) #t)))) |