1 /*
2  * Copyright (c) 2021 Omar Polo <op@omarpolo.com>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include "compat.h"
18 
19 #include <assert.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 
24 #include "telescope.h"
25 #include "ui.h"
26 
27 static void
28 emit_help_item(char *prfx, void *fn)
29 {
30 	struct line	*l;
31 	struct cmd	*cmd;
32 
33 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
34 		if (fn == cmd->fn)
35 			break;
36 	}
37 	assert(cmd != NULL);
38 
39 	if ((l = calloc(1, sizeof(*l))) == NULL)
40 		abort();
41 
42 	l->type = LINE_HELP;
43 	l->line = strdup(prfx);
44 	l->alt = (char*)cmd->cmd;
45 
46 	if (TAILQ_EMPTY(&helpwin.page.head))
47 		TAILQ_INSERT_HEAD(&helpwin.page.head, l, lines);
48 	else
49 		TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
50 }
51 
52 static void
53 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
54 {
55 	struct keymap	*k;
56 	char		 p[32];
57 	const char	*kn;
58 
59 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
60 		strlcpy(p, prfx, sizeof(p));
61 		if (*p != '\0')
62 			strlcat(p, " ", sizeof(p));
63 		if (k->meta)
64 			strlcat(p, "M-", sizeof(p));
65 		if ((kn = unkbd(k->key)) != NULL)
66 			strlcat(p, kn, sizeof(p));
67 		else
68 			strlcat(p, ui_keyname(k->key), sizeof(p));
69 
70 		if (k->fn == NULL)
71 			rec_compute_help(&k->map, p, sizeof(p));
72 		else
73 			emit_help_item(p, k->fn);
74 	}
75 }
76 
77 void
78 recompute_help(void)
79 {
80 	static struct kmap *last_active_map = NULL;
81 	char	p[32] = { 0 };
82 
83 	if (last_active_map != current_map) {
84 		last_active_map = current_map;
85 
86 		erase_buffer(&helpwin);
87 		rec_compute_help(current_map, p, sizeof(p));
88 		wrap_page(&helpwin, help_cols);
89 	}
90 }