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b18c7b77 MV |
1 | ;;;; readline.scm --- support functions for command-line editing |
2 | ;;;; | |
a4bfce11 | 3 | ;;;; Copyright (C) 1997, 1999 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 | ||
24 | (define-module (ice-9 readline) | |
25 | :use-module (ice-9 session) | |
26 | :use-module (ice-9 regex)) | |
27 | ||
acb0207f MV |
28 | ;;; Dynamically link the glue code for accessing the readline library, |
29 | ;;; but only when it isn't already present. | |
b18c7b77 | 30 | |
acb0207f MV |
31 | (if (not (feature? 'readline)) |
32 | (dynamic-call "scm_init_readline" (dynamic-link "libguilereadline.so"))) | |
b18c7b77 MV |
33 | |
34 | ;;; MDJ 980513 <djurfeldt@nada.kth.se>: | |
35 | ;;; There should probably be low-level support instead of this code. | |
36 | ||
37 | (define prompt "") | |
38 | (define prompt2 "") | |
39 | (define input-port (current-input-port)) | |
40 | (define output-port (current-output-port)) | |
41 | (define read-hook #f) | |
42 | ||
43 | (define (make-readline-port) | |
44 | (let ((read-string "") | |
45 | (string-index -1)) | |
46 | (letrec ((get-character | |
47 | (lambda () | |
48 | (cond | |
49 | ((eof-object? read-string) | |
50 | read-string) | |
51 | ((>= string-index (string-length read-string)) | |
52 | (begin | |
53 | (set! string-index -1) | |
54 | #\nl)) | |
55 | ((= string-index -1) | |
56 | (begin | |
57 | (set! read-string | |
58 | (%readline (if (string? prompt) | |
59 | prompt | |
60 | (prompt)) | |
61 | input-port | |
62 | output-port | |
63 | read-hook)) | |
64 | (set! string-index 0) | |
65 | (if (not (eof-object? read-string)) | |
66 | (begin | |
67 | (or (string=? read-string "") | |
68 | (begin | |
69 | (add-history read-string) | |
70 | (set! prompt prompt2))) | |
71 | (get-character)) | |
72 | read-string))) | |
73 | (else | |
74 | (let ((res (string-ref read-string string-index))) | |
75 | (set! string-index (+ 1 string-index)) | |
76 | res)))))) | |
77 | (make-soft-port | |
78 | (vector write-char display #f get-character #f) | |
79 | "rw")))) | |
80 | ||
81 | ;;; We only create one readline port. There's no point in having | |
82 | ;;; more, since they would all share the tty and history --- | |
83 | ;;; everything except the prompt. And don't forget the | |
84 | ;;; compile/load/run phase distinctions. Also, the readline library | |
85 | ;;; isn't reentrant. | |
86 | (define the-readline-port #f) | |
87 | ||
88 | (define history-variable "GUILE_HISTORY") | |
89 | (define history-file (string-append (getenv "HOME") "/.guile_history")) | |
90 | ||
91 | (define-public readline-port | |
92 | (let ((do (lambda (r/w) | |
93 | (if (memq 'history-file (readline-options-interface)) | |
94 | (r/w (or (getenv history-variable) | |
95 | history-file)))))) | |
96 | (lambda () | |
97 | (if (not the-readline-port) | |
98 | (begin | |
99 | (do read-history) | |
100 | (set! the-readline-port (make-readline-port)) | |
101 | (add-hook! exit-hook (lambda () (do write-history))))) | |
102 | the-readline-port))) | |
103 | ||
104 | ;;; The user might try to use readline in his programs. It then | |
105 | ;;; becomes very uncomfortable that the current-input-port is the | |
106 | ;;; readline port... | |
107 | ;;; | |
108 | ;;; Here, we detect this situation and replace it with the | |
109 | ;;; underlying port. | |
110 | ;;; | |
111 | ;;; %readline is the low-level readline procedure. | |
112 | ||
113 | (define-public (readline . args) | |
114 | (let ((prompt prompt) | |
115 | (inp input-port)) | |
116 | (cond ((not (null? args)) | |
117 | (set! prompt (car args)) | |
118 | (set! args (cdr args)) | |
119 | (cond ((not (null? args)) | |
120 | (set! inp (car args)) | |
121 | (set! args (cdr args)))))) | |
122 | (apply %readline | |
123 | prompt | |
124 | (if (eq? inp the-readline-port) | |
125 | input-port | |
126 | inp) | |
127 | args))) | |
128 | ||
129 | (define-public (set-readline-prompt! p . rest) | |
130 | (set! prompt p) | |
131 | (if (not (null? rest)) | |
132 | (set! prompt2 (car rest)))) | |
133 | ||
134 | (define-public (set-readline-input-port! p) | |
135 | (set! input-port p)) | |
136 | ||
137 | (define-public (set-readline-output-port! p) | |
138 | (set! output-port p)) | |
139 | ||
140 | (define-public (set-readline-read-hook! h) | |
141 | (set! read-hook h)) | |
142 | ||
143 | (define-public apropos-completion-function | |
144 | (let ((completions '())) | |
145 | (lambda (text cont?) | |
146 | (if (not cont?) | |
147 | (set! completions | |
148 | (map symbol->string | |
149 | (apropos-internal (string-append "^" | |
150 | (regexp-quote text)))))) | |
151 | (if (null? completions) | |
152 | #f | |
153 | (let ((retval (car completions))) | |
154 | (begin (set! completions (cdr completions)) | |
155 | retval)))))) | |
156 | ||
157 | (set! *readline-completion-function* apropos-completion-function) | |
158 | ||
159 | (define-public (activate-readline) | |
160 | (if (and (isatty? (current-input-port)) | |
161 | (not (and (module-defined? the-root-module | |
162 | 'use-emacs-interface) | |
163 | use-emacs-interface))) | |
164 | (let ((read-hook (lambda () (run-hook before-read-hook)))) | |
165 | (set-current-input-port (readline-port)) | |
166 | (set! repl-reader | |
167 | (lambda (prompt) | |
168 | (dynamic-wind | |
169 | (lambda () | |
170 | (set-readline-prompt! prompt "... ") | |
171 | (set-readline-read-hook! read-hook)) | |
172 | (lambda () (read)) | |
173 | (lambda () | |
174 | (set-readline-prompt! "" "") | |
6373eb6f MD |
175 | (set-readline-read-hook! #f))))) |
176 | (set! (using-readline?) #t)))) |