gui: Kill process group *before* shutting down curses.
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file gui.c Curses-based interface for paraslash. */
8
9 #include <regex.h>
10 #include <signal.h>
11 #include <sys/types.h>
12 #include <curses.h>
13 #include <locale.h>
14 #include <sys/time.h>
15
16 #include "gui.cmdline.h"
17 #include "para.h"
18 #include "gui.h"
19 #include "string.h"
20 #include "ringbuffer.h"
21 #include "fd.h"
22 #include "error.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "signal.h"
26 #include "ggo.h"
27 #include "version.h"
28
29 /** define the array of error lists needed by para_gui */
30 INIT_GUI_ERRLISTS;
31 static char *stat_content[NUM_STAT_ITEMS];
32
33 static struct gui_window {
34 WINDOW *win;
35 bool needs_update;
36 } top, bot, sb, in, sep;
37
38 /** How many lines of output to remember. */
39 #define RINGBUFFER_SIZE 512
40
41 struct rb_entry {
42 char *msg;
43 size_t len;
44 int color;
45 };
46 static struct ringbuffer *bot_win_rb;
47
48 static unsigned scroll_position;
49
50 static pid_t exec_pid;
51
52 static int exec_fds[2] = {-1, -1};
53 static struct gui_args_info conf;
54 static int loglevel;
55
56 /** Type of the process currently being executed. */
57 enum exec_status {
58 EXEC_IDLE, /**< No process running. */
59 EXEC_DCMD, /**< para or display process running. */
60 EXEC_XCMD, /**< External process running. */
61 };
62
63 /**
64 * Codes for various colors.
65 *
66 * Each status item has its own color pair. The ones defined here start at a
67 * higher number so that they do not overlap with these.
68 */
69 enum gui_color_pair {
70 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
71 COLOR_COMMAND,
72 COLOR_OUTPUT,
73 COLOR_MSG,
74 COLOR_ERRMSG,
75 COLOR_SEPARATOR,
76 COLOR_TOP,
77 COLOR_BOT,
78 };
79
80 struct gui_command {
81 const char *key;
82 const char *name;
83 const char *description;
84 void (*handler)(void);
85 };
86
87 static struct gui_theme theme;
88
89 #define GUI_COMMANDS \
90 GUI_COMMAND(help, "?", "print help") \
91 GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
92 GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
93 GUI_COMMAND(reread_conf, "r", "reread configuration file") \
94 GUI_COMMAND(quit, "q", "exit para_gui") \
95 GUI_COMMAND(refresh, "^L", "redraw the screen") \
96 GUI_COMMAND(next_theme, ".", "switch to next theme") \
97 GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
98 GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
99 GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
100 GUI_COMMAND(version, "V", "show the para_gui version") \
101 GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
102 GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
103 GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
104 GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
105 GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
106 GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
107
108 /* declare command handlers */
109 #define GUI_COMMAND(_c, _k, _d) \
110 static void com_ ## _c(void);
111 GUI_COMMANDS
112
113 #undef GUI_COMMAND
114
115 /* define command array */
116 #define GUI_COMMAND(_c, _k, _d) \
117 { \
118 .key = _k, \
119 .name = #_c, \
120 .description = _d, \
121 .handler = com_ ## _c \
122 },
123
124 static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
125
126 struct input_task {
127 struct task *task;
128 };
129
130 struct status_task {
131 struct task *task;
132 pid_t pid;
133 char *buf;
134 int bufsize, loaded;
135 struct timeval next_exec;
136 int fd;
137 };
138
139 /** Stdout/stderr of the executing process is read in chunks of this size. */
140 #define COMMAND_BUF_SIZE 32768
141
142 struct exec_task {
143 struct task *task;
144 char command_buf[2][COMMAND_BUF_SIZE]; /* stdout/stderr of command */
145 int cbo[2]; /* command buf offsets */
146 unsigned flags[2]; /* passed to for_each_line() */
147 };
148
149 static int find_cmd_byname(char *name)
150 {
151 int i;
152
153 for (i = 0; command_list[i].handler; i++)
154 if (!strcmp(command_list[i].name, name))
155 return i;
156 return -1;
157 }
158
159 /*
160 * Even though ncurses provides getmaxx and getmaxy, these functions/macros are
161 * not described in the XSI Curses standard.
162 */
163 static int get_num_lines(struct gui_window *w)
164 {
165 int lines;
166 __a_unused int cols; /* avoid "set but not used" warnings */
167
168 getmaxyx(w->win, lines, cols);
169 return lines;
170 }
171
172 static int get_num_cols(struct gui_window *w)
173 {
174 __a_unused int lines; /* avoid "set but not used" warnings */
175 int cols;
176
177 getmaxyx(w->win, lines, cols);
178 return cols;
179 }
180
181 /** Number of lines of the window are occupied by an output line. */
182 #define NUM_LINES(len) (1 + (len) / get_num_cols(&bot))
183
184 /* isendwin() returns false before initscr() was called */
185 static bool curses_active(void)
186 {
187 return top.win && !isendwin();
188 }
189
190 /* taken from mutt */
191 static char *km_keyname(int c)
192 {
193 static char buf[10];
194
195 if (c == KEY_UP) {
196 sprintf(buf, "<up>");
197 return buf;
198 }
199 if (c == KEY_DOWN) {
200 sprintf(buf, "<down>");
201 return buf;
202 }
203 if (c == KEY_LEFT) {
204 sprintf(buf, "<left>");
205 return buf;
206 }
207 if (c == KEY_RIGHT) {
208 sprintf(buf, "<right>");
209 return buf;
210 }
211 if (c == KEY_NPAGE) {
212 sprintf(buf, "<npage>");
213 return buf;
214 }
215 if (c == KEY_PPAGE) {
216 sprintf(buf, "<ppage>");
217 return buf;
218 }
219 if (c == KEY_HOME) {
220 sprintf(buf, "<home>");
221 return buf;
222 }
223 if (c == KEY_END) {
224 sprintf(buf, "<end>");
225 return buf;
226 }
227 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
228 if (c < 0)
229 c += 256;
230 if (c < 128) {
231 buf[0] = '^';
232 buf[1] = (c + '@') & 0x7f;
233 buf[2] = 0;
234 } else
235 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
236 (c >> 3) & 7, c & 7);
237 } else if (c >= KEY_F0 && c < KEY_F(256))
238 sprintf(buf, "<F%d>", c - KEY_F0);
239 else if (isprint(c))
240 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
241 else
242 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
243 return buf;
244 }
245
246 /* Print given number of spaces to curses window. */
247 static void add_spaces(WINDOW* win, unsigned int num)
248 {
249 const char space[] = " ";
250 const unsigned sz = sizeof(space) - 1; /* number of spaces */
251
252 while (num >= sz) {
253 waddstr(win, space);
254 num -= sz;
255 }
256 if (num > 0) {
257 assert(num < sz);
258 waddstr(win, space + sz - num);
259 }
260 }
261
262 /*
263 * print aligned string to curses window. This function always prints
264 * exactly len chars.
265 */
266 static int align_str(WINDOW* win, const char *str, unsigned int len,
267 unsigned int align)
268 {
269 int ret, num; /* of spaces */
270 size_t width;
271 char *sstr; /* sanitized string */
272
273 if (!win || !str)
274 return 0;
275 ret = sanitize_str(str, len, &sstr, &width);
276 if (ret < 0) {
277 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
278 width = 0;
279 sstr = para_strdup(NULL);
280 }
281 assert(width <= len);
282 num = len - width;
283 if (align == LEFT) {
284 waddstr(win, sstr);
285 add_spaces(win, num);
286 } else if (align == RIGHT) {
287 add_spaces(win, num);
288 waddstr(win, sstr);
289 } else {
290 add_spaces(win, num / 2);
291 waddstr(win, sstr);
292 add_spaces(win, num - num / 2);
293 }
294 free(sstr);
295 return 1;
296 }
297
298 static void refresh_window(struct gui_window *gw)
299 {
300 gw->needs_update = true;
301 }
302
303 static bool window_update_needed(void)
304 {
305 return top.needs_update || bot.needs_update || sb.needs_update ||
306 in.needs_update || sep.needs_update;
307 }
308
309 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
310 {
311 char *msg;
312 va_list ap;
313
314 if (!curses_active())
315 return;
316 wattron(in.win, COLOR_PAIR(color));
317 va_start(ap, fmt);
318 xvasprintf(&msg, fmt, ap);
319 va_end(ap);
320 wmove(in.win, 0, 0);
321 align_str(in.win, msg, get_num_cols(&in), LEFT);
322 free(msg);
323 refresh_window(&in);
324 }
325
326 static void print_status_bar(void)
327 {
328 char *tmp;
329
330 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
331 wmove(sb.win, 0, 0);
332 align_str(sb.win, tmp, get_num_cols(&sb), CENTER);
333 free(tmp);
334 }
335
336 /*
337 * get the number of the oldest rbe that is (partially) visible. On return,
338 * lines contains the sum of the number of lines of all visible entries. If the
339 * first one is only partially visible, lines is greater than bot.lines.
340 */
341 static int first_visible_rbe(unsigned *lines)
342 {
343 int i, bot_lines = get_num_lines(&bot);
344
345 *lines = 0;
346 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
347 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
348 int rbe_lines;
349 if (!rbe)
350 return i - 1;
351 rbe_lines = NUM_LINES(rbe->len);
352 if (rbe_lines > bot_lines)
353 return -1;
354 *lines += rbe_lines;
355 if (*lines >= bot_lines)
356 return i;
357 }
358 return RINGBUFFER_SIZE - 1;
359 }
360
361 /*
362 returns number of first visible rbe, *lines is the number of lines drawn.
363 */
364 static int draw_top_rbe(unsigned *lines)
365 {
366 int bot_cols, bot_lines, ret, fvr = first_visible_rbe(lines);
367 struct rb_entry *rbe;
368 size_t bytes_to_skip, cells_to_skip, width;
369
370 if (fvr < 0)
371 return -1;
372 wmove(bot.win, 0, 0);
373 rbe = ringbuffer_get(bot_win_rb, fvr);
374 if (!rbe)
375 return -1;
376 getmaxyx(bot.win, bot_lines, bot_cols);
377 if (*lines > bot_lines) {
378 /* rbe is partially visible multi-line */
379 cells_to_skip = (*lines - bot_lines) * bot_cols;
380 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
381 if (ret < 0)
382 return ret;
383 ret = strwidth(rbe->msg + bytes_to_skip, &width);
384 if (ret < 0)
385 return ret;
386 } else {
387 bytes_to_skip = 0;
388 width = rbe->len;
389 }
390 wattron(bot.win, COLOR_PAIR(rbe->color));
391 waddstr(bot.win, rbe->msg + bytes_to_skip);
392 *lines = NUM_LINES(width);
393 return fvr;
394 }
395
396 static void redraw_bot_win(void)
397 {
398 unsigned lines;
399 int i, bot_lines = get_num_lines(&bot);
400
401 wmove(bot.win, 0, 0);
402 wclear(bot.win);
403 i = draw_top_rbe(&lines);
404 if (i <= 0)
405 goto out;
406 while (i > 0 && lines < bot_lines) {
407 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
408 if (!rbe) {
409 lines++;
410 waddstr(bot.win, "\n");
411 continue;
412 }
413 lines += NUM_LINES(rbe->len);
414 wattron(bot.win, COLOR_PAIR(rbe->color));
415 waddstr(bot.win, "\n");
416 waddstr(bot.win, rbe->msg);
417 }
418 out:
419 refresh_window(&bot);
420 }
421
422 static void rb_add_entry(int color, char *msg)
423 {
424 struct rb_entry *old, *new;
425 int x, y;
426 size_t len;
427
428 if (strwidth(msg, &len) < 0)
429 return;
430 new = para_malloc(sizeof(struct rb_entry));
431 new->color = color;
432 new->len = len;
433 new->msg = msg;
434 old = ringbuffer_add(bot_win_rb, new);
435 if (old) {
436 free(old->msg);
437 free(old);
438 }
439 if (scroll_position) {
440 /* discard current scrolling, like xterm does */
441 scroll_position = 0;
442 redraw_bot_win();
443 return;
444 }
445 wattron(bot.win, COLOR_PAIR(color));
446 getyx(bot.win, y, x);
447 if (y || x)
448 waddstr(bot.win, "\n");
449 waddstr(bot.win, msg);
450 }
451
452 /*
453 * print formated output to bot win and refresh
454 */
455 __printf_2_3 static void outputf(int color, const char* fmt,...)
456 {
457 char *msg;
458 va_list ap;
459
460 if (!curses_active())
461 return;
462 va_start(ap, fmt);
463 xvasprintf(&msg, fmt, ap);
464 va_end(ap);
465 rb_add_entry(color, msg);
466 refresh_window(&bot);
467 }
468
469 static int add_output_line(char *line, void *data)
470 {
471 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
472
473 if (!curses_active())
474 return 1;
475 rb_add_entry(color, para_strdup(line));
476 return 1;
477 }
478
479 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
480 {
481 va_list ap;
482
483 if (ll < loglevel)
484 return;
485 va_start(ap, fmt);
486 if (curses_active()) {
487 int color = ll <= LL_NOTICE? COLOR_MSG : COLOR_ERRMSG;
488 char *msg;
489 unsigned bytes = xvasprintf(&msg, fmt, ap);
490 if (bytes > 0 && msg[bytes - 1] == '\n')
491 msg[bytes - 1] = '\0'; /* cut trailing newline */
492 rb_add_entry(color, msg);
493 refresh_window(&bot);
494 } else if (exec_pid <= 0) /* no external command running */
495 vfprintf(stderr, fmt, ap);
496 va_end(ap);
497 }
498 /** The log function of para_gui, always set to curses_log(). */
499 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
500
501 /* Call endwin() to reset the terminal into non-visual mode. */
502 static void shutdown_curses(void)
503 {
504 /*
505 * If para_gui received a terminating signal in external mode, the
506 * terminal can be in an unusable state at this point because the child
507 * process might not have caught the signal. In this case endwin() has
508 * already been called and must not be called again. So we first return
509 * to program mode, then call endwin().
510 */
511 if (!curses_active())
512 reset_prog_mode();
513 endwin();
514 }
515
516 /* disable curses, print a message, kill running processes and exit */
517 __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
518 {
519 va_list argp;
520
521 /* Kill every process in our process group. */
522 para_sigaction(SIGTERM, SIG_IGN);
523 kill(0, SIGTERM);
524 /* Wait up to two seconds for child processes to die. */
525 alarm(2);
526 while (waitpid(0, NULL, 0) >= 0)
527 ; /* nothing */
528 alarm(0);
529 /* mousemask() exists only in ncurses */
530 #ifdef NCURSES_MOUSE_VERSION
531 mousemask(~(mmask_t)0, NULL); /* Avoid bad terminal state with xterm. */
532 #endif
533 shutdown_curses();
534 va_start(argp, fmt);
535 vfprintf(stderr, fmt, argp);
536 va_end(argp);
537 exit(exit_code);
538 }
539
540 /*
541 * Print stat item #i to curses window
542 */
543 static void print_stat_item(int i)
544 {
545 char *tmp;
546 struct stat_item_data d = theme.data[i];
547 char *c = stat_content[i];
548 int top_lines = get_num_lines(&top);
549
550 if (!curses_active() || !d.len || !c)
551 return;
552 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
553 wmove(top.win, d.y * top_lines / 100, d.x * COLS / 100);
554 wattron(top.win, COLOR_PAIR(i + 1));
555 align_str(top.win, tmp, d.len * COLS / 100, d.align);
556 free(tmp);
557 refresh_window(&top);
558 }
559
560 static int update_item(int item_num, char *buf)
561 {
562 char **c = stat_content + item_num;
563
564 free(*c);
565 if (buf && buf[0])
566 goto dup;
567 switch (item_num) {
568 case SI_ARTIST:
569 *c = para_strdup("(artist tag not set)");
570 goto print;
571 case SI_TITLE:
572 *c = para_strdup("(title tag not set)");
573 goto print;
574 case SI_YEAR:
575 *c = para_strdup("????");
576 goto print;
577 case SI_ALBUM:
578 *c = para_strdup("(album tag not set)");
579 goto print;
580 case SI_COMMENT:
581 *c = para_strdup("(comment tag not set)");
582 goto print;
583 }
584 dup:
585 *c = para_strdup(buf);
586 print:
587 print_stat_item(item_num);
588 return 1;
589 }
590
591 static void print_all_items(void)
592 {
593 int i;
594
595 if (!curses_active())
596 return;
597 FOR_EACH_STATUS_ITEM(i)
598 print_stat_item(i);
599 }
600
601 static void clear_all_items(void)
602 {
603 int i;
604
605 FOR_EACH_STATUS_ITEM(i) {
606 free(stat_content[i]);
607 stat_content[i] = para_strdup("");
608 }
609 }
610
611 static void status_pre_select(struct sched *s, void *context)
612 {
613 struct status_task *st = context;
614
615 if (st->fd >= 0)
616 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
617 if (task_get_notification(st->task) < 0)
618 return sched_min_delay(s);
619 if (st->fd < 0)
620 sched_request_barrier_or_min_delay(&st->next_exec, s);
621 }
622
623 static int status_post_select(struct sched *s, void *context)
624 {
625 struct status_task *st = context;
626 size_t sz;
627 int ret, ret2;
628
629 ret = task_get_notification(st->task);
630 if (ret == -E_GUI_SIGCHLD && st->pid > 0) {
631 int exit_status;
632 if (waitpid(st->pid, &exit_status, WNOHANG) == st->pid) {
633 st->pid = 0;
634 PARA_ERROR_LOG("stat command exit status: %d",
635 exit_status);
636 }
637 }
638 if (st->fd < 0) {
639 int fds[3] = {0, 1, 0};
640 if (st->pid > 0)
641 return 0;
642 /* Avoid busy loop */
643 if (tv_diff(&st->next_exec, now, NULL) > 0)
644 return 0;
645 st->next_exec.tv_sec = now->tv_sec + 2;
646 ret = para_exec_cmdline_pid(&st->pid, conf.stat_cmd_arg, fds);
647 if (ret < 0)
648 return 0;
649 ret = mark_fd_nonblocking(fds[1]);
650 if (ret < 0) {
651 close(fds[1]);
652 return 0;
653 }
654 st->fd = fds[1];
655 return 0;
656 }
657
658 if (st->loaded >= st->bufsize) {
659 if (st->bufsize > 1000 * 1000) {
660 st->loaded = 0;
661 return 0;
662 }
663 st->bufsize += st->bufsize + 1000;
664 st->buf = para_realloc(st->buf, st->bufsize);
665 }
666 assert(st->loaded < st->bufsize);
667 ret = read_nonblock(st->fd, st->buf + st->loaded,
668 st->bufsize - st->loaded, &s->rfds, &sz);
669 st->loaded += sz;
670 ret2 = for_each_stat_item(st->buf, st->loaded, update_item);
671 if (ret < 0 || ret2 < 0) {
672 st->loaded = 0;
673 PARA_NOTICE_LOG("closing stat pipe: %s\n",
674 para_strerror(ret < 0? -ret : -ret2));
675 close(st->fd);
676 st->fd = -1;
677 clear_all_items();
678 free(stat_content[SI_BASENAME]);
679 stat_content[SI_BASENAME] =
680 para_strdup("stat command terminated!?");
681 print_all_items();
682 return 0;
683 }
684 sz = ret2; /* what is left */
685 if (sz > 0 && sz < st->loaded)
686 memmove(st->buf, st->buf + st->loaded - sz, sz);
687 st->loaded = sz;
688 return 0;
689 }
690
691 /*
692 * init all windows
693 */
694 static void init_wins(int top_lines)
695 {
696 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
697 in_y = LINES - 1, sep_y = top_lines;
698 int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
699 sep_lines = 1;
700
701 assume_default_colors(theme.dflt.fg, theme.dflt.bg);
702 if (top.win) {
703 wresize(top.win, top_lines, COLS);
704 mvwin(top.win, top_y, 0);
705
706 wresize(sb.win, sb_lines, COLS);
707 mvwin(sb.win, sb_y, 0);
708
709 wresize(sep.win, sep_lines, COLS);
710 mvwin(sep.win, sep_y, 0);
711
712 wresize(bot.win, bot_lines, COLS);
713 mvwin(bot.win, bot_y, 0);
714
715 wresize(in.win, in_lines, COLS);
716 mvwin(in.win, in_y, 0);
717 } else {
718 sep.win = newwin(sep_lines, COLS, sep_y, 0);
719 top.win = newwin(top_lines, COLS, top_y, 0);
720 bot.win = newwin(bot_lines, COLS, bot_y, 0);
721 sb.win = newwin(sb_lines, COLS, sb_y, 0);
722 in.win = newwin(in_lines, COLS, in_y, 0);
723 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
724 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
725 wclear(bot.win);
726 wclear(sb.win);
727 wclear(in.win);
728 scrollok(bot.win, 1);
729 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
730 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
731 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
732 wattron(top.win, COLOR_PAIR(COLOR_TOP));
733 nodelay(top.win, 1);
734 nodelay(bot.win, 1);
735 nodelay(sb.win, 1);
736 nodelay(in.win, 0);
737
738 keypad(top.win, 1);
739 keypad(bot.win, 1);
740 keypad(sb.win, 1);
741 keypad(in.win, 1);
742 }
743 wmove(sep.win, 0, 0);
744 whline(sep.win, theme.sep_char, COLS);
745 wclear(top.win);
746 print_all_items();
747 //wclear(bot.win);
748 wnoutrefresh(top.win);
749 wnoutrefresh(bot.win);
750 print_status_bar();
751 wnoutrefresh(sb.win);
752 wnoutrefresh(in.win);
753 wnoutrefresh(sep.win);
754 doupdate();
755 }
756
757 static void init_pair_or_die(short pair, short f, short b)
758 {
759 if (init_pair(pair, f, b) == ERR)
760 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
761 }
762
763 static void init_colors_or_die(void)
764 {
765 int i;
766
767 if (!has_colors())
768 die(EXIT_FAILURE, "fatal: No color term\n");
769 if (start_color() == ERR)
770 die(EXIT_FAILURE, "fatal: failed to start colors\n");
771 FOR_EACH_STATUS_ITEM(i)
772 if (theme.data[i].len)
773 init_pair_or_die(i + 1, theme.data[i].color.fg,
774 theme.data[i].color.bg);
775 init_pair_or_die(COLOR_STATUSBAR, theme.sb.fg, theme.sb.bg);
776 init_pair_or_die(COLOR_COMMAND, theme.cmd.fg, theme.cmd.bg);
777 init_pair_or_die(COLOR_OUTPUT, theme.output.fg, theme.output.bg);
778 init_pair_or_die(COLOR_MSG, theme.msg.fg, theme.msg.bg);
779 init_pair_or_die(COLOR_ERRMSG, theme.err_msg.fg, theme.err_msg.bg);
780 init_pair_or_die(COLOR_SEPARATOR, theme.sep.fg, theme.sep.bg);
781 init_pair_or_die(COLOR_TOP, theme.dflt.fg, theme.dflt.bg);
782 init_pair_or_die(COLOR_BOT, theme.dflt.fg, theme.dflt.bg);
783 }
784
785 /* (Re-)initialize the curses library. */
786 static void init_curses(void)
787 {
788 if (curses_active())
789 return;
790 if (refresh() == ERR) /* refresh is really needed */
791 die(EXIT_FAILURE, "refresh() failed\n");
792 if (LINES < theme.lines_min || COLS < theme.cols_min)
793 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
794 " (need at least %dx%d)\n", COLS, LINES,
795 theme.cols_min, theme.lines_min);
796 curs_set(0); /* make cursor invisible, ignore errors */
797 nonl(); /* do not NL->CR/NL on output, always returns OK */
798 /* don't echo input */
799 if (noecho() == ERR)
800 die(EXIT_FAILURE, "fatal: noecho() failed\n");
801 /* take input chars one at a time, no wait for \n */
802 if (cbreak() == ERR)
803 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
804 init_colors_or_die();
805 clear(); /* ignore non-fatal errors */
806 init_wins(theme.top_lines_default);
807 // noecho(); /* don't echo input */
808 }
809
810 /*
811 * This sucker modifies its first argument. *handler and *arg are
812 * pointers to 0-terminated strings (inside line). Crap.
813 */
814 static int split_key_map(char *line, char **handler, char **arg)
815 {
816 if (!(*handler = strchr(line + 1, ':')))
817 goto err_out;
818 **handler = '\0';
819 (*handler)++;
820 if (!(*arg = strchr(*handler, ':')))
821 goto err_out;
822 **arg = '\0';
823 (*arg)++;
824 return 1;
825 err_out:
826 return 0;
827 }
828
829 static void check_key_map_args_or_die(void)
830 {
831 int i;
832 char *tmp = NULL;
833
834 for (i = 0; i < conf.key_map_given; ++i) {
835 char *handler, *arg;
836
837 free(tmp);
838 tmp = para_strdup(conf.key_map_arg[i]);
839 if (!split_key_map(tmp, &handler, &arg))
840 break;
841 if (strlen(handler) != 1)
842 break;
843 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
844 && *handler != 'p')
845 break;
846 if (*handler != 'i')
847 continue;
848 if (find_cmd_byname(arg) < 0)
849 break;
850 }
851 if (i != conf.key_map_given)
852 die(EXIT_FAILURE, "invalid key map: %s\n", conf.key_map_arg[i]);
853 free(tmp);
854 }
855
856 static void parse_config_file_or_die(bool override)
857 {
858 bool err;
859 char *config_file;
860 struct gui_cmdline_parser_params params = {
861 .override = override,
862 .initialize = 0,
863 .check_required = !override,
864 .check_ambiguity = 0,
865 .print_errors = 1,
866 };
867
868 if (conf.config_file_given)
869 config_file = para_strdup(conf.config_file_arg);
870 else {
871 char *home = para_homedir();
872 config_file = make_message("%s/.paraslash/gui.conf", home);
873 free(home);
874 }
875 if (!file_exists(config_file)) {
876 if (!conf.config_file_given)
877 err = false;
878 else {
879 PARA_EMERG_LOG("config file %s does not exist\n",
880 config_file);
881 err = true;
882 }
883 goto out;
884 }
885 /*
886 * When the gengetopt config file parser is called more than once, any
887 * key map arguments found in the config file are _appended_ to the old
888 * values, even though we turn on ->override. We want the new arguments
889 * to replace the old ones, so we must empty the key_map_arg array
890 * first. Unfortunately, this also clears any key map arguments given
891 * at the command line.
892 */
893 if (override) {
894 int i;
895 for (i = 0; i < conf.key_map_given; i++) {
896 free(conf.key_map_arg[i]);
897 conf.key_map_arg[i] = NULL;
898 }
899 conf.key_map_given = 0;
900 }
901
902 gui_cmdline_parser_config_file(config_file, &conf, &params);
903 loglevel = get_loglevel_by_name(conf.loglevel_arg);
904 check_key_map_args_or_die();
905 err = false;
906 out:
907 free(config_file);
908 if (err)
909 exit(EXIT_FAILURE);
910 theme_init(conf.theme_arg, &theme);
911 }
912
913 /* reread configuration, terminate on errors */
914 static void reread_conf(void)
915 {
916 /*
917 * gengetopt might print to stderr and exit on errors. So we have to
918 * shutdown curses first.
919 */
920 shutdown_curses();
921 parse_config_file_or_die(true /* override */);
922 init_curses();
923 print_in_bar(COLOR_MSG, "config file reloaded\n");
924 }
925
926 /*
927 * React to various signal-related events
928 */
929 static int signal_post_select(struct sched *s, __a_unused void *context)
930 {
931 int ret = para_next_signal(&s->rfds);
932
933 if (ret <= 0)
934 return 0;
935 switch (ret) {
936 case SIGTERM:
937 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
938 return 1;
939 case SIGINT:
940 PARA_WARNING_LOG("caught SIGINT, reset\n");
941 /* Nothing to do. SIGINT killed our child which gets noticed
942 * by do_select and resets everything.
943 */
944 return 1;
945 case SIGUSR1:
946 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
947 reread_conf();
948 return 1;
949 case SIGCHLD:
950 task_notify_all(s, E_GUI_SIGCHLD);
951 return 1;
952 }
953 return 1;
954 }
955
956 static enum exec_status exec_status(void)
957 {
958 if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
959 return EXEC_DCMD;
960 if (exec_pid > 0)
961 return EXEC_XCMD;
962 return EXEC_IDLE;
963 }
964
965 static void exec_pre_select(struct sched *s, void *context)
966 {
967 struct exec_task *et = context;
968 if (exec_fds[0] >= 0)
969 para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
970 if (exec_fds[1] >= 0)
971 para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
972 if (task_get_notification(et->task) < 0)
973 sched_min_delay(s);
974 }
975
976 static int exec_post_select(struct sched *s, void *context)
977 {
978 struct exec_task *ct = context;
979 int i, ret;
980
981 ret = task_get_notification(ct->task);
982 if (ret == -E_GUI_SIGCHLD && exec_pid > 0) {
983 int exit_status;
984 if (waitpid(exec_pid, &exit_status, WNOHANG) == exec_pid) {
985 exec_pid = 0;
986 init_curses();
987 PARA_INFO_LOG("command exit status: %d", exit_status);
988 print_in_bar(COLOR_MSG, " ");
989 }
990 }
991 for (i = 0; i < 2; i++) {
992 size_t sz;
993 if (exec_fds[i] < 0)
994 continue;
995 ret = read_nonblock(exec_fds[i],
996 ct->command_buf[i] + ct->cbo[i],
997 COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
998 ct->cbo[i] += sz;
999 sz = ct->cbo[i];
1000 ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
1001 ct->cbo[i], add_output_line, &i);
1002 if (sz != ct->cbo[i]) { /* at least one line found */
1003 refresh_window(&bot);
1004 ct->flags[i] = 0;
1005 }
1006 if (ret < 0 || exec_pid == 0) {
1007 if (ret < 0)
1008 PARA_NOTICE_LOG("closing command fd %d: %s",
1009 i, para_strerror(-ret));
1010 close(exec_fds[i]);
1011 exec_fds[i] = -1;
1012 ct->flags[i] = 0;
1013 ct->cbo[i] = 0;
1014 if (exec_fds[!i] < 0) /* both fds closed */
1015 return 1;
1016 }
1017 if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
1018 PARA_NOTICE_LOG("discarding overlong line");
1019 ct->cbo[i] = 0;
1020 ct->flags[i] = FELF_DISCARD_FIRST;
1021 }
1022 }
1023 return 0;
1024 }
1025
1026 static void input_pre_select(struct sched *s, __a_unused void *context)
1027 {
1028 if (exec_status() != EXEC_XCMD)
1029 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
1030 if (window_update_needed())
1031 sched_min_delay(s);
1032 }
1033
1034 /* read from command pipe and print data to bot window */
1035 static void exec_and_display(const char *file_and_args)
1036 {
1037 int ret, fds[3] = {0, 1, 1};
1038
1039 outputf(COLOR_COMMAND, "%s", file_and_args);
1040 ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1041 if (ret < 0)
1042 return;
1043 ret = mark_fd_nonblocking(fds[1]);
1044 if (ret < 0)
1045 goto fail;
1046 ret = mark_fd_nonblocking(fds[2]);
1047 if (ret < 0)
1048 goto fail;
1049 exec_fds[0] = fds[1];
1050 exec_fds[1] = fds[2];
1051 print_in_bar(COLOR_MSG, "hit any key to abort\n");
1052 return;
1053 fail:
1054 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1055 close(exec_fds[0]);
1056 close(exec_fds[1]);
1057 }
1058
1059 static void exec_para(const char *args)
1060 {
1061 char *file_and_args;
1062
1063 file_and_args = make_message(BINDIR "/para_client -- %s", args);
1064 exec_and_display(file_and_args);
1065 free(file_and_args);
1066 }
1067
1068 /*
1069 * shutdown curses and stat pipe before executing external commands
1070 */
1071 static void exec_external(char *file_and_args)
1072 {
1073 int fds[3] = {-1, -1, -1};
1074
1075 if (exec_pid)
1076 return;
1077 shutdown_curses();
1078 para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1079 }
1080
1081 static void handle_command(int c)
1082 {
1083 int i;
1084
1085 /* first check user-defined key bindings */
1086 for (i = 0; i < conf.key_map_given; ++i) {
1087 char *tmp, *handler, *arg;
1088
1089 tmp = para_strdup(conf.key_map_arg[i]);
1090 if (!split_key_map(tmp, &handler, &arg)) {
1091 free(tmp);
1092 return;
1093 }
1094 if (strcmp(tmp, km_keyname(c))) {
1095 free(tmp);
1096 continue;
1097 }
1098 if (*handler == 'd')
1099 exec_and_display(arg);
1100 else if (*handler == 'x')
1101 exec_external(arg);
1102 else if (*handler == 'p')
1103 exec_para(arg);
1104 else if (*handler == 'i') {
1105 int num = find_cmd_byname(arg);
1106 if (num >= 0)
1107 command_list[num].handler();
1108 }
1109 free(tmp);
1110 return;
1111 }
1112 /* not found, check internal key bindings */
1113 for (i = 0; command_list[i].handler; i++) {
1114 if (!strcmp(km_keyname(c), command_list[i].key)) {
1115 command_list[i].handler();
1116 return;
1117 }
1118 }
1119 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1120 km_keyname(c));
1121 }
1122
1123 static int input_post_select(__a_unused struct sched *s, __a_unused void *context)
1124 {
1125 int ret;
1126 enum exec_status exs = exec_status();
1127
1128 if (exs == EXEC_XCMD)
1129 return 0;
1130 if (window_update_needed()) {
1131 if (top.needs_update)
1132 assert(wnoutrefresh(top.win) == OK);
1133 if (bot.needs_update)
1134 assert(wnoutrefresh(bot.win) == OK);
1135 if (sep.needs_update)
1136 assert(wnoutrefresh(sep.win) == OK);
1137 if (sb.needs_update)
1138 assert(wnoutrefresh(sb.win) == OK);
1139 if (in.needs_update)
1140 assert(wnoutrefresh(in.win) == OK);
1141 doupdate();
1142 top.needs_update = bot.needs_update = sb.needs_update =
1143 in.needs_update = sep.needs_update = false;
1144 }
1145 ret = wgetch(top.win);
1146 if (ret == ERR)
1147 return 0;
1148 if (ret == KEY_RESIZE) {
1149 if (curses_active()) {
1150 shutdown_curses();
1151 init_curses();
1152 redraw_bot_win();
1153 }
1154 return 0;
1155 }
1156 if (exs == EXEC_IDLE)
1157 handle_command(ret);
1158 else if (exec_pid > 0)
1159 kill(exec_pid, SIGTERM);
1160 return 0;
1161 }
1162
1163 static void print_scroll_msg(void)
1164 {
1165 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1166 int first_rbe = first_visible_rbe(&lines_total);
1167
1168 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1169 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1170 }
1171
1172 static void com_scroll_top(void)
1173 {
1174 int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
1175 unsigned lines = 0;
1176
1177 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1178 i--;
1179 /* i is oldest entry */
1180 for (; lines < bot_lines && i >= 0; i--) {
1181 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1182 if (!rbe)
1183 break;
1184 lines += NUM_LINES(rbe->len);
1185 }
1186 i++;
1187 if (lines > 0 && scroll_position != i) {
1188 scroll_position = i;
1189 redraw_bot_win();
1190 print_scroll_msg();
1191 return;
1192 }
1193 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1194 }
1195
1196 static void com_cancel_scroll(void)
1197 {
1198
1199 if (scroll_position == 0) {
1200 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1201 return;
1202 }
1203 scroll_position = 0;
1204 redraw_bot_win();
1205 }
1206
1207 static void com_page_down(void)
1208 {
1209 unsigned lines = 0;
1210 int i = scroll_position, bot_lines = get_num_lines(&bot);
1211
1212 while (lines < bot_lines && --i > 0) {
1213 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1214 if (!rbe)
1215 break;
1216 lines += NUM_LINES(rbe->len);
1217 }
1218 if (lines) {
1219 scroll_position = i;
1220 redraw_bot_win();
1221 print_scroll_msg();
1222 return;
1223 }
1224 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1225 }
1226
1227 static void com_page_up(void)
1228 {
1229 unsigned lines;
1230 int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
1231
1232 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1233 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1234 return;
1235 }
1236 scroll_position = fvr + 1;
1237 for (; scroll_position > 0; scroll_position--) {
1238 first_visible_rbe(&lines);
1239 if (lines == bot_lines)
1240 break;
1241 }
1242 redraw_bot_win();
1243 print_scroll_msg();
1244 }
1245
1246 static void com_scroll_down(void)
1247 {
1248 struct rb_entry *rbe;
1249 int rbe_lines, bot_lines = get_num_lines(&bot);
1250
1251 if (!scroll_position) {
1252 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1253 return;
1254 }
1255 scroll_position--;
1256 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1257 rbe_lines = NUM_LINES(rbe->len);
1258 wscrl(bot.win, rbe_lines);
1259 wmove(bot.win, bot_lines - rbe_lines, 0);
1260 wattron(bot.win, COLOR_PAIR(rbe->color));
1261 waddstr(bot.win, rbe->msg);
1262 refresh_window(&bot);
1263 print_scroll_msg();
1264 }
1265
1266 static void com_scroll_up(void)
1267 {
1268 struct rb_entry *rbe = NULL;
1269 unsigned lines;
1270 int i, first_rbe, num_scroll;
1271
1272 /* the entry that is going to vanish */
1273 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1274 if (!rbe)
1275 goto err_out;
1276 num_scroll = NUM_LINES(rbe->len);
1277 first_rbe = first_visible_rbe(&lines);
1278 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1279 goto err_out;
1280 scroll_position++;
1281 wscrl(bot.win, -num_scroll);
1282 i = draw_top_rbe(&lines);
1283 if (i < 0)
1284 goto err_out;
1285 while (i > 0 && lines < num_scroll) {
1286 int rbe_lines;
1287 rbe = ringbuffer_get(bot_win_rb, --i);
1288 if (!rbe)
1289 break;
1290 rbe_lines = NUM_LINES(rbe->len);
1291 lines += rbe_lines;
1292 wattron(bot.win, COLOR_PAIR(rbe->color));
1293 waddstr(bot.win, "\n");
1294 waddstr(bot.win, rbe->msg);
1295 if (!i)
1296 break;
1297 i--;
1298 }
1299 refresh_window(&bot);
1300 print_scroll_msg();
1301 return;
1302 err_out:
1303 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1304 }
1305
1306 static void com_ll_decr(void)
1307 {
1308 if (loglevel <= LL_DEBUG) {
1309 print_in_bar(COLOR_ERRMSG,
1310 "loglevel already at maximal verbosity\n");
1311 return;
1312 }
1313 loglevel--;
1314 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1315 }
1316
1317 static void com_ll_incr(void)
1318 {
1319 if (loglevel >= LL_EMERG) {
1320 print_in_bar(COLOR_ERRMSG,
1321 "loglevel already at minimal verbosity\n");
1322 return;
1323 }
1324 loglevel++;
1325 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1326 }
1327
1328 static void com_reread_conf(void)
1329 {
1330 reread_conf();
1331 }
1332
1333 static void com_help(void)
1334 {
1335 int i;
1336
1337 for (i = 0; i < conf.key_map_given; ++i) {
1338 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1339 const char *handler_text = "???", *desc = NULL;
1340
1341 if (!split_key_map(tmp, &handler, &arg)) {
1342 free(tmp);
1343 return;
1344 }
1345 switch (*handler) {
1346 case 'i':
1347 handler_text = "internal";
1348 desc = command_list[find_cmd_byname(arg)].description;
1349 break;
1350 case 'x': handler_text = "external"; break;
1351 case 'd': handler_text = "display "; break;
1352 case 'p': handler_text = "para "; break;
1353 }
1354 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1355 strlen(arg) < 8? "\t" : "",
1356 desc? desc : "");
1357 free(tmp);
1358 }
1359 for (i = 0; command_list[i].handler; i++) {
1360 struct gui_command gc = command_list[i];
1361
1362 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1363 strlen(gc.name) < 8? "\t" : "",
1364 gc.description);
1365 }
1366 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1367 "for more info");
1368 }
1369
1370 static void com_shrink_top_win(void)
1371 {
1372 int top_lines = get_num_lines(&top);
1373
1374 if (top_lines <= theme.top_lines_min) {
1375 PARA_WARNING_LOG("can not decrease top window\n");
1376 return;
1377 }
1378 init_wins(top_lines - 1);
1379 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1380 }
1381
1382 static void com_enlarge_top_win(void)
1383 {
1384 int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
1385
1386 if (bot_lines < 3) {
1387 PARA_WARNING_LOG("can not increase top window\n");
1388 return;
1389 }
1390 init_wins(top_lines + 1);
1391 print_in_bar(COLOR_MSG, "increased top window");
1392 }
1393
1394 static void com_version(void)
1395 {
1396 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1397 }
1398
1399 __noreturn static void com_quit(void)
1400 {
1401 die(EXIT_SUCCESS, "%s", "");
1402 }
1403
1404 static void com_refresh(void)
1405 {
1406 shutdown_curses();
1407 init_curses();
1408 }
1409
1410 static void com_next_theme(void)
1411 {
1412 theme_next(&theme);
1413 com_refresh();
1414 }
1415
1416 static void com_prev_theme(void)
1417 {
1418 theme_prev(&theme);
1419 com_refresh();
1420 }
1421
1422 __noreturn static void print_help_and_die(void)
1423 {
1424 struct ggo_help h = DEFINE_GGO_HELP(gui);
1425 bool d = conf.detailed_help_given;
1426
1427 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1428 exit(0);
1429 }
1430
1431 static int setup_tasks_and_schedule(void)
1432 {
1433 int ret;
1434 struct exec_task exec_task = {.task = NULL};
1435 struct status_task status_task = {.fd = -1};
1436 struct input_task input_task = {.task = NULL};
1437 struct signal_task *signal_task;
1438 struct sched sched = {
1439 .default_timeout = {
1440 .tv_sec = conf.timeout_arg / 1000,
1441 .tv_usec = (conf.timeout_arg % 1000) * 1000,
1442 },
1443 };
1444
1445 exec_task.task = task_register(&(struct task_info) {
1446 .name = "exec",
1447 .pre_select = exec_pre_select,
1448 .post_select = exec_post_select,
1449 .context = &exec_task,
1450 }, &sched);
1451
1452 status_task.task = task_register(&(struct task_info) {
1453 .name = "status",
1454 .pre_select = status_pre_select,
1455 .post_select = status_post_select,
1456 .context = &status_task,
1457 }, &sched);
1458
1459 input_task.task = task_register(&(struct task_info) {
1460 .name = "input",
1461 .pre_select = input_pre_select,
1462 .post_select = input_post_select,
1463 .context = &input_task,
1464 }, &sched);
1465
1466 signal_task = signal_init_or_die();
1467 para_install_sighandler(SIGINT);
1468 para_install_sighandler(SIGTERM);
1469 para_install_sighandler(SIGCHLD);
1470 para_install_sighandler(SIGUSR1);
1471 signal_task->task = task_register(&(struct task_info) {
1472 .name = "signal",
1473 .pre_select = signal_pre_select,
1474 .post_select = signal_post_select,
1475 .context = signal_task,
1476 }, &sched);
1477 ret = schedule(&sched);
1478 sched_shutdown(&sched);
1479 signal_shutdown(signal_task);
1480 return ret;
1481 }
1482
1483 /**
1484 * The main function of para_gui.
1485 *
1486 * \param argc Usual argument count.
1487 * \param argv Usual argument vector.
1488 *
1489 * After initialization para_gui registers the following tasks to the paraslash
1490 * scheduler: status, exec, signal, input.
1491 *
1492 * The status task executes the para_audioc stat command to obtain the status
1493 * of para_server and para_audiod, and displays this information in the top
1494 * window of para_gui.
1495 *
1496 * The exec task is responsible for printing the output of the currently
1497 * running executable to the bottom window.
1498 *
1499 * The signal task performs suitable actions according to any signals received.
1500 * For example it refreshes all windows on terminal size changes and resets the
1501 * terminal on \p SIGTERM.
1502 *
1503 * The input task reads single key strokes from stdin. For each key pressed, it
1504 * executes the command handler associated with this key.
1505 *
1506 * \return \p EXIT_SUCCESS or \p EXIT_FAILURE.
1507 */
1508 int main(int argc, char *argv[])
1509 {
1510 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1511 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1512 version_handle_flag("gui", conf.version_given);
1513 if (conf.help_given || conf.detailed_help_given)
1514 print_help_and_die();
1515 parse_config_file_or_die(false /* override */);
1516 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1517 setlocale(LC_CTYPE, "");
1518 initscr(); /* needed only once, always successful */
1519 init_curses();
1520 return setup_tasks_and_schedule() < 0? EXIT_FAILURE : EXIT_SUCCESS;
1521 }