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 <errno.h>
20 #include <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23 #include <unistd.h>
24 
25 #include "defaults.h"
26 #include "fs.h"
27 #include "minibuffer.h"
28 #include "parser.h"
29 #include "session.h"
30 #include "ui.h"
31 
32 static struct event	 autosaveev;
33 
34 void
35 switch_to_tab(struct tab *tab)
36 {
37 	current_tab = tab;
38 	tab->flags &= ~TAB_URGENT;
39 
40 	if (operating && tab->flags & TAB_LAZY) {
41 		tab->flags ^= TAB_LAZY;
42 		load_url_in_tab(tab, tab->hist_cur->h, NULL, 1);
43 	}
44 }
45 
46 unsigned int
47 tab_new_id(void)
48 {
49 	static uint32_t tab_counter;
50 
51 	return tab_counter++;
52 }
53 
54 struct tab *
55 new_tab(const char *url, const char *base, struct tab *after)
56 {
57 	struct tab	*tab;
58 
59 	ui_schedule_redraw();
60 	autosave_hook();
61 
62 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
63 		event_loopbreak();
64 		return NULL;
65 	}
66 
67 	TAILQ_INIT(&tab->hist.head);
68 
69 	TAILQ_INIT(&tab->buffer.head);
70 	TAILQ_INIT(&tab->buffer.page.head);
71 
72 	tab->id = tab_new_id();
73 
74 	if (after != NULL)
75 		TAILQ_INSERT_AFTER(&tabshead, after, tab, tabs);
76 	else
77 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
78 
79 	if (!operating)
80 		tab->flags |= TAB_LAZY;
81 	load_url_in_tab(tab, url, base, 0);
82 	switch_to_tab(tab);
83 	return tab;
84 }
85 
86 /*
87  * Move a tab from the tablist to the killed tab list and erase its
88  * contents.  NB: doesn't update the current_tab.
89  */
90 void
91 kill_tab(struct tab *tab)
92 {
93 	int count;
94 
95 	stop_tab(tab);
96 	erase_buffer(&tab->buffer);
97 	TAILQ_REMOVE(&tabshead, tab, tabs);
98 	ui_schedule_redraw();
99 	autosave_hook();
100 
101 	if (evtimer_pending(&tab->loadingev, NULL))
102 		evtimer_del(&tab->loadingev);
103 
104 	TAILQ_INSERT_HEAD(&ktabshead, tab, tabs);
105 
106 	/* gc closed tabs */
107 	count = 0;
108 	TAILQ_FOREACH(tab, &ktabshead, tabs)
109 		count++;
110 	while (count > max_killed_tabs) {
111 		count--;
112 		free_tab(TAILQ_LAST(&ktabshead, tabshead));
113 	}
114 }
115 
116 /*
117  * Resurrects the lastest killed tab and returns it. The tab is already
118  * added to the tab list with the TAB_LAZY flag set.  NB: this doesn't
119  * update current_tab.
120  */
121 struct tab *
122 unkill_tab(void)
123 {
124 	struct tab *t;
125 
126 	if (TAILQ_EMPTY(&ktabshead))
127 		return NULL;
128 
129 	autosave_hook();
130 
131 	t = TAILQ_FIRST(&ktabshead);
132 	TAILQ_REMOVE(&ktabshead, t, tabs);
133 	TAILQ_INSERT_TAIL(&tabshead, t, tabs);
134 	t->flags |= TAB_LAZY;
135 	return t;
136 }
137 
138 /*
139  * Free every resource linked to the tab, including the tab itself.
140  * Removes the tab from the *killed* tablist, but doesn't update the
141  * current_tab though.
142  */
143 void
144 free_tab(struct tab *tab)
145 {
146 	/* TODO: free the history */
147 	TAILQ_REMOVE(&ktabshead, tab, tabs);
148 	free(tab);
149 }
150 
151 void
152 stop_tab(struct tab *tab)
153 {
154 	ui_send_net(IMSG_STOP, tab->id, NULL, 0);
155 }
156 
157 static inline void
158 sendtab(struct tab *tab, int killed)
159 {
160 	struct session_tab	 st;
161 	struct session_tab_hist	 sth;
162 	struct hist		*h;
163 	int			 future;
164 
165 	memset(&st, 0, sizeof(st));
166 
167 	if (tab == current_tab)
168 		st.flags |= TAB_CURRENT;
169 	if (killed)
170 		st.flags |= TAB_KILLED;
171 
172 	strlcpy(st.uri, tab->hist_cur->h, sizeof(st.uri));
173 	strlcpy(st.title, tab->buffer.page.title, sizeof(st.title));
174 	ui_send_fs(IMSG_SESSION_TAB, 0, &st, sizeof(st));
175 
176 	future = 0;
177 	TAILQ_FOREACH(h, &tab->hist.head, entries) {
178 		if (h == tab->hist_cur) {
179 			future = 1;
180 			continue;
181 		}
182 
183 		memset(&sth, 0, sizeof(sth));
184 		strlcpy(sth.uri, h->h, sizeof(sth.uri));
185 		sth.future = future;
186 		ui_send_fs(IMSG_SESSION_TAB_HIST, 0, &sth, sizeof(sth));
187 	}
188 
189 }
190 
191 void
192 save_session(void)
193 {
194 	struct tab		*tab;
195 
196 	if (safe_mode)
197 		return;
198 
199 	ui_send_fs(IMSG_SESSION_START, 0, NULL, 0);
200 
201 	TAILQ_FOREACH(tab, &tabshead, tabs)
202 		sendtab(tab, 0);
203 	TAILQ_FOREACH(tab, &ktabshead, tabs)
204 		sendtab(tab, 1);
205 
206 	ui_send_fs(IMSG_SESSION_END, 0, NULL, 0);
207 }
208 
209 void
210 autosave_init(void)
211 {
212 	evtimer_set(&autosaveev, autosave_timer, NULL);
213 }
214 
215 void
216 autosave_timer(int fd, short event, void *data)
217 {
218 	save_session();
219 }
220 
221 /*
222  * Function to be called in "interesting" places where we may want to
223  * schedule an autosave (like on new tab or before loading an url.)
224  */
225 void
226 autosave_hook(void)
227 {
228 	struct timeval tv;
229 
230 	if (autosave <= 0)
231 		return;
232 
233 	if (!evtimer_pending(&autosaveev, NULL)) {
234 		tv.tv_sec = autosave;
235 		tv.tv_usec = 0;
236 
237 		evtimer_add(&autosaveev, &tv);
238 	}
239 }