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