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 "session.h"
29 #include "ui.h"
30 
31 static struct event	 autosaveev;
32 
33 void
34 switch_to_tab(struct tab *tab)
35 {
36 	current_tab = tab;
37 	tab->flags &= ~TAB_URGENT;
38 
39 	if (operating && tab->flags & TAB_LAZY)
40 		load_url_in_tab(tab, tab->hist_cur->h, NULL, LU_MODE_NOHIST);
41 }
42 
43 unsigned int
44 tab_new_id(void)
45 {
46 	static uint32_t tab_counter;
47 
48 	return tab_counter++;
49 }
50 
51 struct tab *
52 new_tab(const char *url, const char *base, struct tab *after)
53 {
54 	struct tab	*tab;
55 
56 	ui_schedule_redraw();
57 	autosave_hook();
58 
59 	if ((tab = calloc(1, sizeof(*tab))) == NULL) {
60 		event_loopbreak();
61 		return NULL;
62 	}
63 
64 	TAILQ_INIT(&tab->hist.head);
65 	TAILQ_INIT(&tab->buffer.head);
66 	TAILQ_INIT(&tab->buffer.page.head);
67 	evtimer_set(&tab->loadingev, NULL, NULL);
68 
69 	tab->id = tab_new_id();
70 
71 	if (after != NULL)
72 		TAILQ_INSERT_AFTER(&tabshead, after, tab, tabs);
73 	else
74 		TAILQ_INSERT_TAIL(&tabshead, tab, tabs);
75 
76 	if (!operating)
77 		tab->flags |= TAB_LAZY;
78 	load_url_in_tab(tab, url, base, 0);
79 	switch_to_tab(tab);
80 	return tab;
81 }
82 
83 /*
84  * Move a tab from the tablist to the killed tab list and erase its
85  * contents.  Append should always be 0 to prepend tabs so unkill_tab
86  * can work correctly; appending is only useful during startup when
87  * receiving the list of killed tabs to keep the correct order.
88  * NB: doesn't update the current_tab.
89  */
90 void
91 kill_tab(struct tab *tab, int append)
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 	if (append)
105 		TAILQ_INSERT_TAIL(&ktabshead, tab, tabs);
106 	else
107 		TAILQ_INSERT_HEAD(&ktabshead, tab, tabs);
108 
109 	/* gc closed tabs */
110 	count = 0;
111 	TAILQ_FOREACH(tab, &ktabshead, tabs)
112 		count++;
113 	while (count > max_killed_tabs) {
114 		count--;
115 		free_tab(TAILQ_LAST(&ktabshead, tabshead));
116 	}
117 }
118 
119 /*
120  * Resurrects the lastest killed tab and returns it.  The tab is already
121  * added to the tab list with the TAB_LAZY flag set.  NB: this doesn't
122  * update current_tab.
123  */
124 struct tab *
125 unkill_tab(void)
126 {
127 	struct tab *t;
128 
129 	if (TAILQ_EMPTY(&ktabshead))
130 		return NULL;
131 
132 	ui_schedule_redraw();
133 	autosave_hook();
134 
135 	t = TAILQ_FIRST(&ktabshead);
136 	TAILQ_REMOVE(&ktabshead, t, tabs);
137 	TAILQ_INSERT_TAIL(&tabshead, t, tabs);
138 	t->flags |= TAB_LAZY;
139 	return t;
140 }
141 
142 /*
143  * Free every resource linked to the tab, including the tab itself, and
144  * removes it from the *killed* tablist.
145  */
146 void
147 free_tab(struct tab *tab)
148 {
149 	TAILQ_REMOVE(&ktabshead, tab, tabs);
150 	hist_clear(&tab->hist);
151 	free(tab);
152 }
153 
154 void
155 stop_tab(struct tab *tab)
156 {
157 	ui_send_net(IMSG_STOP, tab->id, NULL, 0);
158 }
159 
160 static inline void
161 sendtab(struct tab *tab, int killed)
162 {
163 	struct session_tab	 st;
164 	struct session_tab_hist	 sth;
165 	struct hist		*h;
166 	int			 future;
167 
168 	memset(&st, 0, sizeof(st));
169 
170 	if (tab == current_tab)
171 		st.flags |= TAB_CURRENT;
172 	if (killed)
173 		st.flags |= TAB_KILLED;
174 
175 	get_scroll_position(tab, &st.top_line, &st.current_line);
176 
177 	strlcpy(st.uri, tab->hist_cur->h, sizeof(st.uri));
178 	strlcpy(st.title, tab->buffer.page.title, sizeof(st.title));
179 	ui_send_fs(IMSG_SESSION_TAB, 0, &st, sizeof(st));
180 
181 	future = 0;
182 	TAILQ_FOREACH(h, &tab->hist.head, entries) {
183 		if (h == tab->hist_cur) {
184 			future = 1;
185 			continue;
186 		}
187 
188 		memset(&sth, 0, sizeof(sth));
189 		strlcpy(sth.uri, h->h, sizeof(sth.uri));
190 		sth.future = future;
191 		ui_send_fs(IMSG_SESSION_TAB_HIST, 0, &sth, sizeof(sth));
192 	}
193 
194 }
195 
196 void
197 save_session(void)
198 {
199 	struct tab		*tab;
200 
201 	if (safe_mode)
202 		return;
203 
204 	ui_send_fs(IMSG_SESSION_START, 0, NULL, 0);
205 
206 	TAILQ_FOREACH(tab, &tabshead, tabs)
207 		sendtab(tab, 0);
208 	TAILQ_FOREACH(tab, &ktabshead, tabs)
209 		sendtab(tab, 1);
210 
211 	ui_send_fs(IMSG_SESSION_END, 0, NULL, 0);
212 }
213 
214 void
215 autosave_init(void)
216 {
217 	evtimer_set(&autosaveev, autosave_timer, NULL);
218 }
219 
220 void
221 autosave_timer(int fd, short event, void *data)
222 {
223 	save_session();
224 }
225 
226 /*
227  * Function to be called in "interesting" places where we may want to
228  * schedule an autosave (like on new tab or before loading an url.)
229  */
230 void
231 autosave_hook(void)
232 {
233 	struct timeval tv;
234 
235 	if (autosave <= 0)
236 		return;
237 
238 	if (!evtimer_pending(&autosaveev, NULL)) {
239 		tv.tv_sec = autosave;
240 		tv.tv_usec = 0;
241 
242 		evtimer_add(&autosaveev, &tv);
243 	}
244 }