Merge branch 't/mvblob_improvement'
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2014 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", para_strerror(-ret));
663 close(st->fd);
664 st->fd = -1;
665 clear_all_items();
666 free(stat_content[SI_BASENAME]);
667 stat_content[SI_BASENAME] =
668 para_strdup("stat command terminated!?");
669 print_all_items();
670 return 0;
671 }
672 sz = ret2; /* what is left */
673 if (sz > 0 && sz < st->loaded)
674 memmove(st->buf, st->buf + st->loaded - sz, sz);
675 st->loaded = sz;
676 return 0;
677 }
678
679 /*
680 * init all windows
681 */
682 static void init_wins(int top_lines)
683 {
684 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
685 in_y = LINES - 1, sep_y = top_lines;
686 int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
687 sep_lines = 1;
688
689 assume_default_colors(theme.dflt.fg, theme.dflt.bg);
690 if (top.win) {
691 wresize(top.win, top_lines, COLS);
692 mvwin(top.win, top_y, 0);
693
694 wresize(sb.win, sb_lines, COLS);
695 mvwin(sb.win, sb_y, 0);
696
697 wresize(sep.win, sep_lines, COLS);
698 mvwin(sep.win, sep_y, 0);
699
700 wresize(bot.win, bot_lines, COLS);
701 mvwin(bot.win, bot_y, 0);
702
703 wresize(in.win, in_lines, COLS);
704 mvwin(in.win, in_y, 0);
705 } else {
706 sep.win = newwin(sep_lines, COLS, sep_y, 0);
707 top.win = newwin(top_lines, COLS, top_y, 0);
708 bot.win = newwin(bot_lines, COLS, bot_y, 0);
709 sb.win = newwin(sb_lines, COLS, sb_y, 0);
710 in.win = newwin(in_lines, COLS, in_y, 0);
711 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
712 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
713 wclear(bot.win);
714 wclear(sb.win);
715 wclear(in.win);
716 scrollok(bot.win, 1);
717 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
718 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
719 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
720 wattron(top.win, COLOR_PAIR(COLOR_TOP));
721 nodelay(top.win, 1);
722 nodelay(bot.win, 1);
723 nodelay(sb.win, 1);
724 nodelay(in.win, 0);
725
726 keypad(top.win, 1);
727 keypad(bot.win, 1);
728 keypad(sb.win, 1);
729 keypad(in.win, 1);
730 }
731 wmove(sep.win, 0, 0);
732 whline(sep.win, theme.sep_char, COLS);
733 wclear(top.win);
734 print_all_items();
735 //wclear(bot.win);
736 wnoutrefresh(top.win);
737 wnoutrefresh(bot.win);
738 print_status_bar();
739 wnoutrefresh(sb.win);
740 wnoutrefresh(in.win);
741 wnoutrefresh(sep.win);
742 doupdate();
743 }
744
745 static void init_pair_or_die(short pair, short f, short b)
746 {
747 if (init_pair(pair, f, b) == ERR)
748 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
749 }
750
751 static void init_colors_or_die(void)
752 {
753 int i;
754
755 if (!has_colors())
756 die(EXIT_FAILURE, "fatal: No color term\n");
757 if (start_color() == ERR)
758 die(EXIT_FAILURE, "fatal: failed to start colors\n");
759 FOR_EACH_STATUS_ITEM(i)
760 if (theme.data[i].len)
761 init_pair_or_die(i + 1, theme.data[i].color.fg,
762 theme.data[i].color.bg);
763 init_pair_or_die(COLOR_STATUSBAR, theme.sb.fg, theme.sb.bg);
764 init_pair_or_die(COLOR_COMMAND, theme.cmd.fg, theme.cmd.bg);
765 init_pair_or_die(COLOR_OUTPUT, theme.output.fg, theme.output.bg);
766 init_pair_or_die(COLOR_MSG, theme.msg.fg, theme.msg.bg);
767 init_pair_or_die(COLOR_ERRMSG, theme.err_msg.fg, theme.err_msg.bg);
768 init_pair_or_die(COLOR_SEPARATOR, theme.sep.fg, theme.sep.bg);
769 init_pair_or_die(COLOR_TOP, theme.dflt.fg, theme.dflt.bg);
770 init_pair_or_die(COLOR_BOT, theme.dflt.fg, theme.dflt.bg);
771 }
772
773 /* (Re-)initialize the curses library. */
774 static void init_curses(void)
775 {
776 if (curses_active())
777 return;
778 if (top.win && refresh() == ERR) /* refresh is really needed */
779 die(EXIT_FAILURE, "refresh() failed\n");
780 if (LINES < theme.lines_min || COLS < theme.cols_min)
781 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
782 " (need at least %dx%d)\n", COLS, LINES,
783 theme.cols_min, theme.lines_min);
784 curs_set(0); /* make cursor invisible, ignore errors */
785 nonl(); /* do not NL->CR/NL on output, always returns OK */
786 /* don't echo input */
787 if (noecho() == ERR)
788 die(EXIT_FAILURE, "fatal: noecho() failed\n");
789 /* take input chars one at a time, no wait for \n */
790 if (cbreak() == ERR)
791 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
792 init_colors_or_die();
793 clear(); /* ignore non-fatal errors */
794 init_wins(theme.top_lines_default);
795 // noecho(); /* don't echo input */
796 }
797
798 /*
799 * This sucker modifies its first argument. *handler and *arg are
800 * pointers to 0-terminated strings (inside line). Crap.
801 */
802 static int split_key_map(char *line, char **handler, char **arg)
803 {
804 if (!(*handler = strchr(line + 1, ':')))
805 goto err_out;
806 **handler = '\0';
807 (*handler)++;
808 if (!(*arg = strchr(*handler, ':')))
809 goto err_out;
810 **arg = '\0';
811 (*arg)++;
812 return 1;
813 err_out:
814 return 0;
815 }
816
817 static void check_key_map_args_or_die(void)
818 {
819 int i;
820 char *tmp = NULL;
821
822 for (i = 0; i < conf.key_map_given; ++i) {
823 char *handler, *arg;
824
825 free(tmp);
826 tmp = para_strdup(conf.key_map_arg[i]);
827 if (!split_key_map(tmp, &handler, &arg))
828 break;
829 if (strlen(handler) != 1)
830 break;
831 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
832 && *handler != 'p')
833 break;
834 if (*handler != 'i')
835 continue;
836 if (find_cmd_byname(arg) < 0)
837 break;
838 }
839 if (i != conf.key_map_given)
840 die(EXIT_FAILURE, "invalid key map: %s\n", conf.key_map_arg[i]);
841 free(tmp);
842 }
843
844 static void parse_config_file_or_die(bool override)
845 {
846 bool err;
847 char *config_file;
848 struct gui_cmdline_parser_params params = {
849 .override = override,
850 .initialize = 0,
851 .check_required = !override,
852 .check_ambiguity = 0,
853 .print_errors = 1,
854 };
855
856 if (conf.config_file_given)
857 config_file = para_strdup(conf.config_file_arg);
858 else {
859 char *home = para_homedir();
860 config_file = make_message("%s/.paraslash/gui.conf", home);
861 free(home);
862 }
863 if (!file_exists(config_file)) {
864 if (!conf.config_file_given)
865 err = false;
866 else {
867 PARA_EMERG_LOG("config file %s does not exist\n",
868 config_file);
869 err = true;
870 }
871 goto out;
872 }
873 gui_cmdline_parser_config_file(config_file, &conf, &params);
874 loglevel = get_loglevel_by_name(conf.loglevel_arg);
875 check_key_map_args_or_die();
876 err = false;
877 out:
878 free(config_file);
879 if (err)
880 exit(EXIT_FAILURE);
881 theme_init(conf.theme_arg, &theme);
882 }
883
884 /* reread configuration, terminate on errors */
885 static void reread_conf(void)
886 {
887 /*
888 * gengetopt might print to stderr and exit on errors. So we have to
889 * shutdown curses first.
890 */
891 shutdown_curses();
892 parse_config_file_or_die(true /* override */);
893 init_curses();
894 print_in_bar(COLOR_MSG, "config file reloaded\n");
895 }
896
897 /*
898 * React to various signal-related events
899 */
900 static int signal_post_select(struct sched *s, __a_unused void *context)
901 {
902 int ret = para_next_signal(&s->rfds);
903
904 if (ret <= 0)
905 return 0;
906 switch (ret) {
907 case SIGTERM:
908 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
909 return 1;
910 case SIGINT:
911 PARA_WARNING_LOG("caught SIGINT, reset\n");
912 /* Nothing to do. SIGINT killed our child which gets noticed
913 * by do_select and resets everything.
914 */
915 return 1;
916 case SIGUSR1:
917 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
918 reread_conf();
919 return 1;
920 case SIGCHLD:
921 task_notify_all(s, E_GUI_SIGCHLD);
922 return 1;
923 }
924 return 1;
925 }
926
927 static enum exec_status exec_status(void)
928 {
929 if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
930 return EXEC_DCMD;
931 if (exec_pid > 0)
932 return EXEC_XCMD;
933 return EXEC_IDLE;
934 }
935
936 static void exec_pre_select(struct sched *s, void *context)
937 {
938 struct exec_task *et = context;
939 if (exec_fds[0] >= 0)
940 para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
941 if (exec_fds[1] >= 0)
942 para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
943 if (task_get_notification(et->task) < 0)
944 sched_min_delay(s);
945 }
946
947 static int exec_post_select(struct sched *s, void *context)
948 {
949 struct exec_task *ct = context;
950 int i, ret;
951
952 ret = task_get_notification(ct->task);
953 if (ret == -E_GUI_SIGCHLD && exec_pid > 0) {
954 int exit_status;
955 if (waitpid(exec_pid, &exit_status, WNOHANG) == exec_pid) {
956 exec_pid = 0;
957 init_curses();
958 PARA_INFO_LOG("command exit status: %d", exit_status);
959 print_in_bar(COLOR_MSG, " ");
960 }
961 }
962 for (i = 0; i < 2; i++) {
963 size_t sz;
964 if (exec_fds[i] < 0)
965 continue;
966 ret = read_nonblock(exec_fds[i],
967 ct->command_buf[i] + ct->cbo[i],
968 COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
969 ct->cbo[i] += sz;
970 sz = ct->cbo[i];
971 ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
972 ct->cbo[i], add_output_line, &i);
973 if (sz != ct->cbo[i]) { /* at least one line found */
974 refresh_window(&bot);
975 ct->flags[i] = 0;
976 }
977 if (ret < 0 || exec_pid == 0) {
978 if (ret < 0)
979 PARA_NOTICE_LOG("closing command fd %d: %s",
980 i, para_strerror(-ret));
981 close(exec_fds[i]);
982 exec_fds[i] = -1;
983 ct->flags[i] = 0;
984 ct->cbo[i] = 0;
985 if (exec_fds[!i] < 0) /* both fds closed */
986 return 1;
987 }
988 if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
989 PARA_NOTICE_LOG("discarding overlong line");
990 ct->cbo[i] = 0;
991 ct->flags[i] = FELF_DISCARD_FIRST;
992 }
993 }
994 return 0;
995 }
996
997 static void input_pre_select(struct sched *s, __a_unused void *context)
998 {
999 if (exec_status() != EXEC_XCMD)
1000 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
1001 if (window_update_needed())
1002 sched_min_delay(s);
1003 }
1004
1005 /* read from command pipe and print data to bot window */
1006 static void exec_and_display(const char *file_and_args)
1007 {
1008 int ret, fds[3] = {0, 1, 1};
1009
1010 outputf(COLOR_COMMAND, "%s", file_and_args);
1011 ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1012 if (ret < 0)
1013 return;
1014 ret = mark_fd_nonblocking(fds[1]);
1015 if (ret < 0)
1016 goto fail;
1017 ret = mark_fd_nonblocking(fds[2]);
1018 if (ret < 0)
1019 goto fail;
1020 exec_fds[0] = fds[1];
1021 exec_fds[1] = fds[2];
1022 print_in_bar(COLOR_MSG, "hit any key to abort\n");
1023 return;
1024 fail:
1025 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1026 close(exec_fds[0]);
1027 close(exec_fds[1]);
1028 }
1029
1030 static void exec_para(const char *args)
1031 {
1032 char *file_and_args;
1033
1034 file_and_args = make_message(BINDIR "/para_client -- %s", args);
1035 exec_and_display(file_and_args);
1036 free(file_and_args);
1037 }
1038
1039 /*
1040 * shutdown curses and stat pipe before executing external commands
1041 */
1042 static void exec_external(char *file_and_args)
1043 {
1044 int fds[3] = {-1, -1, -1};
1045
1046 if (exec_pid)
1047 return;
1048 shutdown_curses();
1049 para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1050 }
1051
1052 static void handle_command(int c)
1053 {
1054 int i;
1055
1056 /* first check user-defined key bindings */
1057 for (i = 0; i < conf.key_map_given; ++i) {
1058 char *tmp, *handler, *arg;
1059
1060 tmp = para_strdup(conf.key_map_arg[i]);
1061 if (!split_key_map(tmp, &handler, &arg)) {
1062 free(tmp);
1063 return;
1064 }
1065 if (strcmp(tmp, km_keyname(c))) {
1066 free(tmp);
1067 continue;
1068 }
1069 if (*handler == 'd')
1070 exec_and_display(arg);
1071 else if (*handler == 'x')
1072 exec_external(arg);
1073 else if (*handler == 'p')
1074 exec_para(arg);
1075 else if (*handler == 'i') {
1076 int num = find_cmd_byname(arg);
1077 if (num >= 0)
1078 command_list[num].handler();
1079 }
1080 free(tmp);
1081 return;
1082 }
1083 /* not found, check internal key bindings */
1084 for (i = 0; command_list[i].handler; i++) {
1085 if (!strcmp(km_keyname(c), command_list[i].key)) {
1086 command_list[i].handler();
1087 return;
1088 }
1089 }
1090 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1091 km_keyname(c));
1092 }
1093
1094 static int input_post_select(__a_unused struct sched *s, __a_unused void *context)
1095 {
1096 int ret;
1097 enum exec_status exs = exec_status();
1098
1099 if (exs == EXEC_XCMD)
1100 return 0;
1101 if (window_update_needed()) {
1102 if (top.needs_update)
1103 assert(wnoutrefresh(top.win) == OK);
1104 if (bot.needs_update)
1105 assert(wnoutrefresh(bot.win) == OK);
1106 if (sep.needs_update)
1107 assert(wnoutrefresh(sep.win) == OK);
1108 if (sb.needs_update)
1109 assert(wnoutrefresh(sb.win) == OK);
1110 if (in.needs_update)
1111 assert(wnoutrefresh(in.win) == OK);
1112 doupdate();
1113 top.needs_update = bot.needs_update = sb.needs_update =
1114 in.needs_update = sep.needs_update = false;
1115 }
1116 ret = wgetch(top.win);
1117 if (ret == ERR)
1118 return 0;
1119 if (ret == KEY_RESIZE) {
1120 if (curses_active()) {
1121 shutdown_curses();
1122 init_curses();
1123 redraw_bot_win();
1124 }
1125 return 0;
1126 }
1127 if (exs == EXEC_IDLE)
1128 handle_command(ret);
1129 else if (exec_pid > 0)
1130 kill(exec_pid, SIGTERM);
1131 return 0;
1132 }
1133
1134 static void signal_pre_select(struct sched *s, void *context)
1135 {
1136 struct signal_task *st = context;
1137 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
1138 }
1139
1140 static void print_scroll_msg(void)
1141 {
1142 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1143 int first_rbe = first_visible_rbe(&lines_total);
1144
1145 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1146 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1147 }
1148
1149 static void com_scroll_top(void)
1150 {
1151 int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
1152 unsigned lines = 0;
1153
1154 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1155 i--;
1156 /* i is oldest entry */
1157 for (; lines < bot_lines && i >= 0; i--) {
1158 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1159 if (!rbe)
1160 break;
1161 lines += NUM_LINES(rbe->len);
1162 }
1163 i++;
1164 if (lines > 0 && scroll_position != i) {
1165 scroll_position = i;
1166 redraw_bot_win();
1167 print_scroll_msg();
1168 return;
1169 }
1170 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1171 }
1172
1173 static void com_cancel_scroll(void)
1174 {
1175
1176 if (scroll_position == 0) {
1177 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1178 return;
1179 }
1180 scroll_position = 0;
1181 redraw_bot_win();
1182 }
1183
1184 static void com_page_down(void)
1185 {
1186 unsigned lines = 0;
1187 int i = scroll_position, bot_lines = get_num_lines(&bot);
1188
1189 while (lines < bot_lines && --i > 0) {
1190 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1191 if (!rbe)
1192 break;
1193 lines += NUM_LINES(rbe->len);
1194 }
1195 if (lines) {
1196 scroll_position = i;
1197 redraw_bot_win();
1198 print_scroll_msg();
1199 return;
1200 }
1201 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1202 }
1203
1204 static void com_page_up(void)
1205 {
1206 unsigned lines;
1207 int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
1208
1209 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1210 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1211 return;
1212 }
1213 scroll_position = fvr + 1;
1214 for (; scroll_position > 0; scroll_position--) {
1215 first_visible_rbe(&lines);
1216 if (lines == bot_lines)
1217 break;
1218 }
1219 redraw_bot_win();
1220 print_scroll_msg();
1221 }
1222
1223 static void com_scroll_down(void)
1224 {
1225 struct rb_entry *rbe;
1226 int rbe_lines, bot_lines = get_num_lines(&bot);
1227
1228 if (!scroll_position) {
1229 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1230 return;
1231 }
1232 scroll_position--;
1233 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1234 rbe_lines = NUM_LINES(rbe->len);
1235 wscrl(bot.win, rbe_lines);
1236 wmove(bot.win, bot_lines - rbe_lines, 0);
1237 wattron(bot.win, COLOR_PAIR(rbe->color));
1238 waddstr(bot.win, rbe->msg);
1239 refresh_window(&bot);
1240 print_scroll_msg();
1241 }
1242
1243 static void com_scroll_up(void)
1244 {
1245 struct rb_entry *rbe = NULL;
1246 unsigned lines;
1247 int i, first_rbe, num_scroll;
1248
1249 /* the entry that is going to vanish */
1250 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1251 if (!rbe)
1252 goto err_out;
1253 num_scroll = NUM_LINES(rbe->len);
1254 first_rbe = first_visible_rbe(&lines);
1255 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1256 goto err_out;
1257 scroll_position++;
1258 wscrl(bot.win, -num_scroll);
1259 i = draw_top_rbe(&lines);
1260 if (i < 0)
1261 goto err_out;
1262 while (i > 0 && lines < num_scroll) {
1263 int rbe_lines;
1264 rbe = ringbuffer_get(bot_win_rb, --i);
1265 if (!rbe)
1266 break;
1267 rbe_lines = NUM_LINES(rbe->len);
1268 lines += rbe_lines;
1269 wattron(bot.win, COLOR_PAIR(rbe->color));
1270 waddstr(bot.win, "\n");
1271 waddstr(bot.win, rbe->msg);
1272 if (!i)
1273 break;
1274 i--;
1275 }
1276 refresh_window(&bot);
1277 print_scroll_msg();
1278 return;
1279 err_out:
1280 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1281 }
1282
1283 static void com_ll_decr(void)
1284 {
1285 if (loglevel <= LL_DEBUG) {
1286 print_in_bar(COLOR_ERRMSG,
1287 "loglevel already at maximal verbosity\n");
1288 return;
1289 }
1290 loglevel--;
1291 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1292 }
1293
1294 static void com_ll_incr(void)
1295 {
1296 if (loglevel >= LL_EMERG) {
1297 print_in_bar(COLOR_ERRMSG,
1298 "loglevel already at minimal verbosity\n");
1299 return;
1300 }
1301 loglevel++;
1302 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1303 }
1304
1305 static void com_reread_conf(void)
1306 {
1307 reread_conf();
1308 }
1309
1310 static void com_help(void)
1311 {
1312 int i;
1313
1314 for (i = 0; i < conf.key_map_given; ++i) {
1315 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1316 const char *handler_text = "???", *desc = NULL;
1317
1318 if (!split_key_map(tmp, &handler, &arg)) {
1319 free(tmp);
1320 return;
1321 }
1322 switch (*handler) {
1323 case 'i':
1324 handler_text = "internal";
1325 desc = command_list[find_cmd_byname(arg)].description;
1326 break;
1327 case 'x': handler_text = "external"; break;
1328 case 'd': handler_text = "display "; break;
1329 case 'p': handler_text = "para "; break;
1330 }
1331 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1332 strlen(arg) < 8? "\t" : "",
1333 desc? desc : "");
1334 free(tmp);
1335 }
1336 for (i = 0; command_list[i].handler; i++) {
1337 struct gui_command gc = command_list[i];
1338
1339 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1340 strlen(gc.name) < 8? "\t" : "",
1341 gc.description);
1342 }
1343 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1344 "for more info");
1345 }
1346
1347 static void com_shrink_top_win(void)
1348 {
1349 int top_lines = get_num_lines(&top);
1350
1351 if (top_lines <= theme.top_lines_min) {
1352 PARA_WARNING_LOG("can not decrease top window\n");
1353 return;
1354 }
1355 init_wins(top_lines - 1);
1356 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1357 }
1358
1359 static void com_enlarge_top_win(void)
1360 {
1361 int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
1362
1363 if (bot_lines < 3) {
1364 PARA_WARNING_LOG("can not increase top window\n");
1365 return;
1366 }
1367 init_wins(top_lines + 1);
1368 print_in_bar(COLOR_MSG, "increased top window");
1369 }
1370
1371 static void com_version(void)
1372 {
1373 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1374 }
1375
1376 __noreturn static void com_quit(void)
1377 {
1378 die(EXIT_SUCCESS, "%s", "");
1379 }
1380
1381 static void com_refresh(void)
1382 {
1383 shutdown_curses();
1384 init_curses();
1385 }
1386
1387 static void com_next_theme(void)
1388 {
1389 theme_next(&theme);
1390 com_refresh();
1391 }
1392
1393 static void com_prev_theme(void)
1394 {
1395 theme_prev(&theme);
1396 com_refresh();
1397 }
1398
1399 __noreturn static void print_help_and_die(void)
1400 {
1401 struct ggo_help h = DEFINE_GGO_HELP(gui);
1402 bool d = conf.detailed_help_given;
1403
1404 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1405 exit(0);
1406 }
1407
1408 static int setup_tasks_and_schedule(void)
1409 {
1410 struct exec_task exec_task = {.task = NULL};
1411 struct status_task status_task = {.fd = -1};
1412 struct input_task input_task = {.task = NULL};
1413 struct signal_task signal_task = {.task = NULL};
1414 struct sched sched = {
1415 .default_timeout = {
1416 .tv_sec = conf.timeout_arg / 1000,
1417 .tv_usec = (conf.timeout_arg % 1000) * 1000,
1418 },
1419 };
1420
1421 exec_task.task = task_register(&(struct task_info) {
1422 .name = "exec",
1423 .pre_select = exec_pre_select,
1424 .post_select = exec_post_select,
1425 .context = &exec_task,
1426 }, &sched);
1427
1428 status_task.task = task_register(&(struct task_info) {
1429 .name = "status",
1430 .pre_select = status_pre_select,
1431 .post_select = status_post_select,
1432 .context = &status_task,
1433 }, &sched);
1434
1435 input_task.task = task_register(&(struct task_info) {
1436 .name = "input",
1437 .pre_select = input_pre_select,
1438 .post_select = input_post_select,
1439 .context = &input_task,
1440 }, &sched);
1441
1442 signal_task.fd = para_signal_init();
1443 para_install_sighandler(SIGINT);
1444 para_install_sighandler(SIGTERM);
1445 para_install_sighandler(SIGCHLD);
1446 para_install_sighandler(SIGUSR1);
1447 signal_task.task = task_register(&(struct task_info) {
1448 .name = "signal",
1449 .pre_select = signal_pre_select,
1450 .post_select = signal_post_select,
1451 .context = &signal_task,
1452 }, &sched);
1453 return schedule(&sched);
1454 }
1455
1456 /**
1457 * The main function of para_gui.
1458 *
1459 * \param argc Usual argument count.
1460 * \param argv Usual argument vector.
1461 *
1462 * After initialization para_gui registers the following tasks to the paraslash
1463 * scheduler: status, exec, signal, input.
1464 *
1465 * The status task executes the para_audioc stat command to obtain the status
1466 * of para_server and para_audiod, and displays this information in the top
1467 * window of para_gui.
1468 *
1469 * The exec task is responsible for printing the output of the currently
1470 * running executable to the bottom window.
1471 *
1472 * The signal task performs suitable actions according to any signals received.
1473 * For example it refreshes all windows on terminal size changes and resets the
1474 * terminal on \p SIGTERM.
1475 *
1476 * The input task reads single key strokes from stdin. For each key pressed, it
1477 * executes the command handler associated with this key.
1478 *
1479 * \return \p EXIT_SUCCESS or \p EXIT_FAILURE.
1480 */
1481 int main(int argc, char *argv[])
1482 {
1483 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1484 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1485 version_handle_flag("gui", conf.version_given);
1486 if (conf.help_given || conf.detailed_help_given)
1487 print_help_and_die();
1488 parse_config_file_or_die(false /* override */);
1489 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1490 setlocale(LC_CTYPE, "");
1491 initscr(); /* needed only once, always successful */
1492 init_curses();
1493 return setup_tasks_and_schedule() < 0? EXIT_FAILURE : EXIT_SUCCESS;
1494 }