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[pkg/abook.git] / abook_rl.c
1 /*
2  * $Id$
3  *
4  * by JH <jheinonen@users.sourceforge.net>
5  *
6  * Copyright (C) Jaakko Heinonen
7  */
8
9 #include <stdio.h>
10 #include <stdlib.h>
11 #include <sys/types.h>
12 #include "abook.h"
13 #include "abook_rl.h"
14
15 #ifdef HAVE_CONFIG_H
16 #       include "config.h"
17 #endif
18
19 #if defined(HAVE_READLINE_READLINE_H)
20 #       include <readline/readline.h>
21 #elif defined(HAVE_READLINE_H)
22 #       include <readline.h>
23 #else
24 #       error "You don't seem to have readline.h"
25 #       error "No HAVE_READLINE_READLINE_H or HAVE_READLINE_H defined"
26 #endif
27
28 #if defined(HAVE_READLINE_HISTORY_H)
29 #       include <readline/history.h>
30 #elif defined(HAVE_HISTORY_H)
31 #       include <history.h>
32 #else
33 #       error "You don't seem to have history.h"
34 #       error "No HAVE_READLINE_HISTORY_H or HAVE_HISTORY_H defined"
35 #endif
36
37 #ifdef HANDLE_MULTIBYTE
38 #       include <mbswidth.h>
39 #endif
40
41 #define RL_READLINE_NAME        "Abook"
42
43 static int rl_x, rl_y;
44 static WINDOW *rl_win;
45
46 static bool rl_cancelled;
47
48 static void
49 rl_refresh()
50 {
51         /* refresh(); */
52         wrefresh(rl_win);
53 }
54
55 #ifdef HANDLE_MULTIBYTE
56 static int
57 rline_calc_point()
58 {
59         return (int)mbsnwidth(rl_line_buffer, rl_point, 0);
60 }
61 #endif
62
63 static void
64 rline_update()
65 {
66 #ifdef HANDLE_MULTIBYTE
67         int real_point = rline_calc_point() + rl_x;
68 #else
69         int real_point = rl_point + rl_x;
70 #endif
71
72         if(real_point > (COLS - 1))
73                 mvwaddnstr(rl_win, rl_y, rl_x,
74                         rl_line_buffer + (1 + real_point - COLS),
75                         COLS - rl_x - 1);
76         else
77                 mvwaddnstr(rl_win, rl_y, rl_x, rl_line_buffer, rl_end);
78
79         wclrtoeol(rl_win);
80         wmove(rl_win, rl_y, min(real_point, COLS - 1));
81
82         rl_refresh();
83 }
84
85 static void
86 rline_compdisp(char **matches, int n, int max_len)
87 {
88         /* dummy */
89 }
90
91 static void
92 rline_prep_terminal(int dummy)
93 {
94 #if (RL_VERSION_MAJOR == 4 && RL_VERSION_MINOR > 2) || (RL_VERSION_MAJOR > 4)
95         /* nothing */
96 #else
97         /*
98          * #warning is an extension. Not all compilers support it.
99          */
100 #       ifdef __GNUC__
101 #               warning "You seem to have rather old readline version or \
102 non-GNU version of it. If you have problems please use \
103 GNU readline 4.3 or newer. \
104 GNU readline versions 4.0, 4.1 and 4.2 should be OK despite \
105 of this warning."
106 #       endif
107         /*
108          * this kludge avoids older readline libraries to print a newline
109          */
110         extern int readline_echoing_p;
111         readline_echoing_p = 0;
112 #endif
113         raw();
114         keypad(rl_win, FALSE);
115 }
116
117 static void
118 rline_deprep_terminal(void)
119 {
120         cbreak();
121         keypad(rl_win, TRUE);
122 }
123
124 static int
125 rl_cancel(int dummy1, int dummy2)
126 {
127         rl_cancelled = TRUE;
128
129         rl_done = 1;
130
131         return 0;
132 }
133
134 static void
135 abook_rl_init(bool use_completion)
136 {
137         rl_readline_name = RL_READLINE_NAME;
138
139 #if RL_VERSION_MAJOR >= 4
140         rl_already_prompted = 1;
141 #endif
142         rl_catch_sigwinch = 0;
143         rl_erase_empty_line = 0;
144
145         rl_redisplay_function = rline_update;
146         rl_completion_display_matches_hook = rline_compdisp;
147         rl_prep_term_function = rline_prep_terminal;
148         rl_deprep_term_function = rline_deprep_terminal;
149
150         rl_unbind_function_in_map(rl_clear_screen, rl_get_keymap());
151         rl_unbind_function_in_map(rl_reverse_search_history, rl_get_keymap());
152         rl_unbind_function_in_map(rl_re_read_init_file, rl_get_keymap());
153
154         if(use_completion) {
155                 rl_bind_key('\t', rl_menu_complete);
156         } else {
157                 rl_unbind_function_in_map(rl_complete, rl_get_keymap());
158                 rl_unbind_function_in_map(rl_menu_complete, rl_get_keymap());
159         }
160
161         rl_bind_key('g' & 31, rl_cancel); /* C-g */
162
163         clear_history();
164
165         rl_cancelled = FALSE;
166 }
167
168 char *
169 abook_readline(WINDOW *w, int y, int x, char *s, int limit, bool use_completion)
170 {
171         char *ret;
172
173         abook_rl_init(use_completion);
174
175         wmove(rl_win = w, rl_y = y, rl_x = x);
176         rl_refresh();
177
178         if(s && *s)
179                 add_history(s);
180
181         ret = readline(NULL);
182
183         if(rl_cancelled && ret) {
184                 free(ret);
185                 ret = NULL;
186         }
187
188         return ret;
189 }
190