1 /*
2  * Copyright (c) 2022 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 <stdlib.h>
20 #include <stdint.h>
21 #include <string.h>
22 
23 #include "telescope.h"
24 #include "mcache.h"
25 #include "parser.h"
26 #include "utils.h"
27 
28 const char *gemtext_prefixes[] = {
29 	[LINE_TEXT] = "",
30 	[LINE_TITLE_1] = "# ",
31 	[LINE_TITLE_2] = "## ",
32 	[LINE_TITLE_3] = "### ",
33 	[LINE_ITEM] = "* ",
34 	[LINE_QUOTE] = "> ",
35 	[LINE_PRE_START] = "``` ",
36 	[LINE_PRE_CONTENT] = "",
37 	[LINE_PRE_END] = "```",
38 };
39 
40 struct mcache {
41 	struct ohash	h;
42 	size_t		tot;
43 } mcache;
44 
45 struct mcache_entry {
46 	const char	*parser_name;
47 	int		 trust;
48 	struct evbuffer	*evb;
49 	char		 url[];
50 };
51 
52 void
53 mcache_init(void)
54 {
55 	struct ohash_info info = {
56 		.key_offset = offsetof(struct mcache_entry, url),
57 		.calloc = hash_calloc,
58 		.free = hash_free,
59 		.alloc = hash_alloc,
60 	};
61 
62 	ohash_init(&mcache.h, 5, &info);
63 }
64 
65 int
66 mcache_tab(struct tab *tab)
67 {
68 	struct mcache_entry	*e;
69 	struct line		*line;
70 	unsigned int		 slot;
71 	size_t			 l, len;
72 	const char		*url;
73 
74 	url = tab->hist_cur->h;
75 	l = strlen(url);
76 	len = sizeof(*e) + l + 1;
77 
78 	if ((e = calloc(1, len)) == NULL)
79 		return -1;
80 	e->parser_name = tab->buffer.page.name;
81 	e->trust = tab->trust;
82 	memcpy(e->url, url, l);
83 
84 	if ((e->evb = evbuffer_new()) == NULL)
85 		goto err;
86 
87 	TAILQ_FOREACH(line, &tab->buffer.page.head, lines) {
88 		const char	*text, *alt;
89 		int		 r;
90 
91 		if ((text = line->line) == NULL)
92 			text = "";
93 
94 		if ((alt = line->alt) == NULL)
95 			alt = "";
96 
97 		switch (line->type) {
98 		case LINE_TEXT:
99 		case LINE_TITLE_1:
100 		case LINE_TITLE_2:
101 		case LINE_TITLE_3:
102 		case LINE_ITEM:
103 		case LINE_QUOTE:
104 		case LINE_PRE_START:
105 		case LINE_PRE_CONTENT:
106 		case LINE_PRE_END:
107 			r = evbuffer_add_printf(e->evb, "%s%s\n",
108 			    gemtext_prefixes[line->type], text);
109 			break;
110 
111 		case LINE_LINK:
112 			r = evbuffer_add_printf(e->evb, "=> %s %s\n",
113 			    alt, text);
114 			break;
115 
116 		case LINE_PATCH:
117 		case LINE_PATCH_HDR:
118 		case LINE_PATCH_HUNK_HDR:
119 		case LINE_PATCH_ADD:
120 		case LINE_PATCH_DEL:
121 			/* TODO */
122 			r = -1;
123 			break;
124 
125 		case LINE_COMPL:
126 		case LINE_COMPL_CURRENT:
127 		case LINE_HELP:
128 		case LINE_DOWNLOAD:
129 		case LINE_DOWNLOAD_DONE:
130 		case LINE_DOWNLOAD_INFO:
131 		case LINE_FRINGE:
132 			/* not reached */
133 			abort();
134 		}
135 
136 		if (r == -1)
137 			goto err;
138 	}
139 
140 	slot = ohash_qlookup(&mcache.h, url);
141 	ohash_insert(&mcache.h, slot, e);
142 	return 0;
143 
144 err:
145 	if (e->evb != NULL)
146 		evbuffer_free(e->evb);
147 	free(e);
148 	return -1;
149 }
150 
151 int
152 mcache_lookup(const char *url, struct tab *tab)
153 {
154 	struct mcache_entry	*e;
155 	unsigned int		 slot;
156 
157 	slot = ohash_qlookup(&mcache.h, url);
158 	if ((e = ohash_find(&mcache.h, slot)) == NULL)
159 		return 0;
160 
161 	parser_init(tab, gemtext_initparser);
162 	if (!parser_parse(tab, EVBUFFER_DATA(e->evb), EVBUFFER_LENGTH(e->evb)))
163 		goto err;
164 	if (!parser_free(tab))
165 		goto err;
166 
167 	tab->buffer.page.name = e->parser_name;
168 	tab->trust = e->trust;
169 	return 1;
170 
171 err:
172 	parser_free(tab);
173 	erase_buffer(&tab->buffer);
174 	return 0;
175 }