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 "cmd.h"
25 #include "keymap.h"
26 #include "telescope.h"
27 #include "ui.h"
28 
29 static void	emit_help_item(char *, interactivefn *);
30 static void	rec_compute_help(struct kmap *, char *, size_t);
31 
32 static void
33 emit_help_item(char *prfx, interactivefn *fn)
34 {
35 	struct line	*l;
36 	struct cmd	*cmd;
37 
38 	for (cmd = cmds; cmd->cmd != NULL; ++cmd) {
39 		if (fn == cmd->fn)
40 			break;
41 	}
42 	assert(cmd != NULL);
43 
44 	if ((l = calloc(1, sizeof(*l))) == NULL)
45 		abort();
46 
47 	l->type = LINE_HELP;
48 	l->line = strdup(prfx);
49 	l->alt = (char*)cmd->cmd;
50 
51 	TAILQ_INSERT_TAIL(&helpwin.page.head, l, lines);
52 }
53 
54 static void
55 rec_compute_help(struct kmap *keymap, char *prfx, size_t len)
56 {
57 	struct keymap	*k;
58 	char		 p[32];
59 	const char	*kn;
60 
61 	TAILQ_FOREACH(k, &keymap->m, keymaps) {
62 		strlcpy(p, prfx, sizeof(p));
63 		if (*p != '\0')
64 			strlcat(p, " ", sizeof(p));
65 		if (k->meta)
66 			strlcat(p, "M-", sizeof(p));
67 		if ((kn = unkbd(k->key)) != NULL)
68 			strlcat(p, kn, sizeof(p));
69 		else
70 			strlcat(p, ui_keyname(k->key), sizeof(p));
71 
72 		if (k->fn == NULL)
73 			rec_compute_help(&k->map, p, sizeof(p));
74 		else
75 			emit_help_item(p, k->fn);
76 	}
77 }
78 
79 void
80 recompute_help(void)
81 {
82 	static struct kmap *last_active_map = NULL;
83 	char	p[32] = { 0 };
84 
85 	if (last_active_map != current_map) {
86 		last_active_map = current_map;
87 
88 		helpwin.page.name = "*Help*";
89 		erase_buffer(&helpwin);
90 		rec_compute_help(current_map, p, sizeof(p));
91 		wrap_page(&helpwin, help_cols);
92 	}
93 }