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
175
176
177
|
/* Copyright (C) 2022 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
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 3 of the License, 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 program. If not, see <https://www.gnu.org/licenses/>.
*/
#include <histedit.h>
#include "contrib/string.h"
#include "utils/common/lookup.h"
#include "utils/common/msg.h"
#include "utils/knsupdate/knsupdate_exec.h"
#include "utils/knsupdate/knsupdate_interactive.h"
#define HISTORY_FILE ".knsupdate_history"
static char *prompt(EditLine *el)
{
return PROGRAM_NAME"> ";
}
static void print_commands(void)
{
printf("\n");
for (const char **cmd = knsupdate_cmd_array; *cmd != NULL; cmd++) {
printf(" %-18s\n", (*cmd) + 1);
}
}
static void cmds_lookup(EditLine *el, const char *str, size_t str_len)
{
lookup_t lookup;
int ret = lookup_init(&lookup);
if (ret != KNOT_EOK) {
return;
}
// Fill the lookup with command names.
for (const char **desc = knsupdate_cmd_array; *desc != NULL; desc++) {
ret = lookup_insert(&lookup, (*desc) + 1, NULL);
if (ret != KNOT_EOK) {
goto cmds_lookup_finish;
}
}
(void)lookup_complete(&lookup, str, str_len, el, true);
cmds_lookup_finish:
lookup_deinit(&lookup);
}
static unsigned char complete(EditLine *el, int ch)
{
int argc, token, pos;
const char **argv;
const LineInfo *li = el_line(el);
Tokenizer *tok = tok_init(NULL);
// Parse the line.
int ret = tok_line(tok, li, &argc, &argv, &token, &pos);
if (ret != 0) {
goto complete_exit;
}
// Show possible commands.
if (argc == 0) {
print_commands();
goto complete_exit;
}
// Complete the command name.
if (token == 0) {
cmds_lookup(el, argv[0], pos);
goto complete_exit;
}
// Find the command descriptor.
const char **desc = knsupdate_cmd_array;
while (*desc != NULL && strcmp((*desc) + 1, argv[0]) != 0) {
desc++;
}
if (*desc == NULL) {
goto complete_exit;
}
complete_exit:
tok_reset(tok);
tok_end(tok);
return CC_REDISPLAY;
}
int interactive_loop(knsupdate_params_t *params)
{
char *hist_file = NULL;
const char *home = getenv("HOME");
if (home != NULL) {
hist_file = sprintf_alloc("%s/%s", home, HISTORY_FILE);
}
if (hist_file == NULL) {
INFO("failed to get home directory");
}
EditLine *el = el_init(PROGRAM_NAME, stdin, stdout, stderr);
if (el == NULL) {
ERR("interactive mode not available");
free(hist_file);
return KNOT_ERROR;
}
History *hist = history_init();
if (hist == NULL) {
ERR("interactive mode not available");
el_end(el);
free(hist_file);
return KNOT_ERROR;
}
HistEvent hev = { 0 };
history(hist, &hev, H_SETSIZE, 1000);
history(hist, &hev, H_SETUNIQUE, 1);
el_set(el, EL_HIST, history, hist);
history(hist, &hev, H_LOAD, hist_file);
el_set(el, EL_TERMINAL, NULL);
el_set(el, EL_EDITOR, "emacs");
el_set(el, EL_PROMPT, prompt);
el_set(el, EL_SIGNAL, 1);
el_source(el, NULL);
// Warning: these two el_sets()'s always leak -- in libedit2 library!
// For more details see this commit's message.
el_set(el, EL_ADDFN, PROGRAM_NAME"-complete",
"Perform "PROGRAM_NAME" completion.", complete);
el_set(el, EL_BIND, "^I", PROGRAM_NAME"-complete", NULL);
int count;
const char *line;
while ((line = el_gets(el, &count)) != NULL && count > 0) {
char command[count + 1];
memcpy(command, line, count);
command[count] = '\0';
// Removes trailing newline
size_t cmd_len = strcspn(command, "\n");
command[cmd_len] = '\0';
if (cmd_len > 0) {
history(hist, &hev, H_ENTER, command);
history(hist, &hev, H_SAVE, hist_file);
}
// Process the command.
(void)knsupdate_process_line(command, params);
if (params->stop) {
break;
}
}
history_end(hist);
free(hist_file);
el_end(el);
return KNOT_EOK;
}
|
