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1 | ;;;; readline.scm --- support functions for command-line editing |
2 | ;;;; | |
1b09b607 | 3 | ;;;; Copyright (C) 1997, 1999, 2000, 2001, 2002, 2006 Free Software Foundation, Inc. |
74c88f53 RB |
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 | |
92205699 MV |
17 | ;;;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
18 | ;;;; Boston, MA 02110-1301 USA | |
74c88f53 RB |
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 | ||
24 | \f | |
25 | ||
26 | (define-module (ice-9 readline) | |
27 | :use-module (ice-9 session) | |
28 | :use-module (ice-9 regex) | |
29 | :use-module (ice-9 buffered-input) | |
30 | :no-backtrace) | |
31 | ||
32 | \f | |
33 | ||
34 | ;;; Dynamically link the glue code for accessing the readline library, | |
35 | ;;; but only when it isn't already present. | |
36 | ||
37 | (if (not (provided? 'readline)) | |
1b09b607 | 38 | (load-extension "libguilereadline-v-17" "scm_init_readline")) |
74c88f53 RB |
39 | |
40 | (if (not (provided? 'readline)) | |
41 | (scm-error 'misc-error | |
42 | #f | |
43 | "readline is not provided in this Guile installation" | |
44 | '() | |
45 | '())) | |
46 | ||
47 | \f | |
48 | ||
49 | ;;; Run-time options | |
50 | ||
51 | (export | |
52 | readline-options | |
53 | readline-enable | |
54 | readline-disable) | |
55 | (export-syntax | |
56 | readline-set!) | |
57 | ||
58 | (define-option-interface | |
59 | (readline-options-interface | |
60 | (readline-options readline-enable readline-disable) | |
61 | (readline-set!))) | |
62 | ||
63 | \f | |
64 | ||
65 | ;;; MDJ 980513 <djurfeldt@nada.kth.se>: | |
66 | ;;; There should probably be low-level support instead of this code. | |
67 | ||
68 | ;;; Dirk:FIXME:: If the-readline-port, input-port or output-port are closed, | |
69 | ;;; guile will enter an endless loop or crash. | |
70 | ||
71 | (define prompt "") | |
72 | (define prompt2 "") | |
73 | (define input-port (current-input-port)) | |
74 | (define output-port (current-output-port)) | |
75 | (define read-hook #f) | |
76 | ||
77 | (define (make-readline-port) | |
78 | (make-line-buffered-input-port (lambda (continuation?) | |
79 | (let* ((prompt (if continuation? | |
80 | prompt2 | |
81 | prompt)) | |
82 | (str (%readline (if (string? prompt) | |
83 | prompt | |
84 | (prompt)) | |
85 | input-port | |
86 | output-port | |
87 | read-hook))) | |
88 | (or (eof-object? str) | |
89 | (string=? str "") | |
90 | (add-history str)) | |
91 | str)))) | |
92 | ||
93 | ;;; We only create one readline port. There's no point in having | |
94 | ;;; more, since they would all share the tty and history --- | |
95 | ;;; everything except the prompt. And don't forget the | |
96 | ;;; compile/load/run phase distinctions. Also, the readline library | |
97 | ;;; isn't reentrant. | |
98 | (define the-readline-port #f) | |
99 | ||
100 | (define history-variable "GUILE_HISTORY") | |
101 | (define history-file (string-append (getenv "HOME") "/.guile_history")) | |
102 | ||
103 | (define-public readline-port | |
104 | (let ((do (lambda (r/w) | |
105 | (if (memq 'history-file (readline-options-interface)) | |
106 | (r/w (or (getenv history-variable) | |
107 | history-file)))))) | |
108 | (lambda () | |
109 | (if (not the-readline-port) | |
110 | (begin | |
111 | (do read-history) | |
112 | (set! the-readline-port (make-readline-port)) | |
113 | (add-hook! exit-hook (lambda () | |
114 | (do write-history) | |
115 | (clear-history))))) | |
116 | the-readline-port))) | |
117 | ||
118 | ;;; The user might try to use readline in his programs. It then | |
119 | ;;; becomes very uncomfortable that the current-input-port is the | |
120 | ;;; readline port... | |
121 | ;;; | |
122 | ;;; Here, we detect this situation and replace it with the | |
123 | ;;; underlying port. | |
124 | ;;; | |
125 | ;;; %readline is the low-level readline procedure. | |
126 | ||
127 | (define-public (readline . args) | |
128 | (let ((prompt prompt) | |
129 | (inp input-port)) | |
130 | (cond ((not (null? args)) | |
131 | (set! prompt (car args)) | |
132 | (set! args (cdr args)) | |
133 | (cond ((not (null? args)) | |
134 | (set! inp (car args)) | |
135 | (set! args (cdr args)))))) | |
136 | (apply %readline | |
137 | prompt | |
138 | (if (eq? inp the-readline-port) | |
139 | input-port | |
140 | inp) | |
141 | args))) | |
142 | ||
143 | (define-public (set-readline-prompt! p . rest) | |
144 | (set! prompt p) | |
145 | (if (not (null? rest)) | |
146 | (set! prompt2 (car rest)))) | |
147 | ||
148 | (define-public (set-readline-input-port! p) | |
149 | (cond ((or (not (file-port? p)) (not (input-port? p))) | |
150 | (scm-error 'wrong-type-arg "set-readline-input-port!" | |
151 | "Not a file input port: ~S" (list p) #f)) | |
152 | ((port-closed? p) | |
153 | (scm-error 'misc-error "set-readline-input-port!" | |
154 | "Port not open: ~S" (list p) #f)) | |
155 | (else | |
156 | (set! input-port p)))) | |
157 | ||
158 | (define-public (set-readline-output-port! p) | |
159 | (cond ((or (not (file-port? p)) (not (output-port? p))) | |
160 | (scm-error 'wrong-type-arg "set-readline-input-port!" | |
161 | "Not a file output port: ~S" (list p) #f)) | |
162 | ((port-closed? p) | |
163 | (scm-error 'misc-error "set-readline-output-port!" | |
164 | "Port not open: ~S" (list p) #f)) | |
165 | (else | |
166 | (set! output-port p)))) | |
167 | ||
168 | (define-public (set-readline-read-hook! h) | |
169 | (set! read-hook h)) | |
170 | ||
171 | (if (provided? 'regex) | |
172 | (begin | |
173 | (define-public apropos-completion-function | |
174 | (let ((completions '())) | |
175 | (lambda (text cont?) | |
176 | (if (not cont?) | |
177 | (set! completions | |
178 | (map symbol->string | |
179 | (apropos-internal | |
180 | (string-append "^" (regexp-quote text)))))) | |
181 | (if (null? completions) | |
182 | #f | |
183 | (let ((retval (car completions))) | |
184 | (begin (set! completions (cdr completions)) | |
185 | retval)))))) | |
186 | ||
187 | (set! *readline-completion-function* apropos-completion-function) | |
188 | )) | |
189 | ||
190 | (define-public (with-readline-completion-function completer thunk) | |
191 | "With @var{completer} as readline completion function, call @var{thunk}." | |
192 | (let ((old-completer *readline-completion-function*)) | |
193 | (dynamic-wind | |
194 | (lambda () | |
195 | (set! *readline-completion-function* completer)) | |
196 | thunk | |
197 | (lambda () | |
198 | (set! *readline-completion-function* old-completer))))) | |
199 | ||
200 | (define-public (activate-readline) | |
201 | (if (and (isatty? (current-input-port)) | |
202 | (not (let ((guile-user-module (resolve-module '(guile-user)))) | |
203 | (and (module-defined? guile-user-module 'use-emacs-interface) | |
204 | (module-ref guile-user-module 'use-emacs-interface))))) | |
205 | (let ((read-hook (lambda () (run-hook before-read-hook)))) | |
206 | (set-current-input-port (readline-port)) | |
207 | (set! repl-reader | |
208 | (lambda (prompt) | |
209 | (dynamic-wind | |
210 | (lambda () | |
211 | (set-buffered-input-continuation?! (readline-port) #f) | |
212 | (set-readline-prompt! prompt "... ") | |
213 | (set-readline-read-hook! read-hook)) | |
214 | (lambda () (read)) | |
215 | (lambda () | |
216 | (set-readline-prompt! "" "") | |
217 | (set-readline-read-hook! #f))))) | |
218 | (set! (using-readline?) #t)))) | |
1b09b607 KR |
219 | |
220 | (define-public (make-completion-function strings) | |
221 | "Construct and return a completion function for a list of strings. | |
222 | The returned function is suitable for passing to | |
223 | @code{with-readline-completion-function. The argument @var{strings} | |
224 | should be a list of strings, where each string is one of the possible | |
225 | completions." | |
226 | (letrec ((strs '()) | |
227 | (regexp #f) | |
228 | (completer (lambda (text continue?) | |
229 | (if continue? | |
230 | (if (null? strs) | |
231 | #f | |
232 | (let ((str (car strs))) | |
233 | (set! strs (cdr strs)) | |
234 | (if (string-match regexp str) | |
235 | str | |
236 | (completer text #t)))) | |
237 | (begin | |
238 | (set! strs strings) | |
239 | (set! regexp | |
240 | (string-append "^" (regexp-quote text))) | |
241 | (completer text #t)))))) | |
242 | completer)) |