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