69a9243da25245d5a4a67c1bf98deaef222dc593
[paraslash.git] / gui.c
1 /* Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2
3 /** \file gui.c Curses-based interface for paraslash. */
4
5 #include <regex.h>
6 #include <signal.h>
7 #include <sys/types.h>
8 #include <curses.h>
9 #include <locale.h>
10 #include <sys/time.h>
11 #include <lopsub.h>
12
13 #include "gui.lsg.h"
14 #include "para.h"
15 #include "gui.h"
16 #include "string.h"
17 #include "ringbuffer.h"
18 #include "fd.h"
19 #include "error.h"
20 #include "list.h"
21 #include "sched.h"
22 #include "signal.h"
23 #include "version.h"
24
25 /** Array of error strings. */
26 DEFINE_PARA_ERRLIST;
27
28 static struct lls_parse_result *cmdline_lpr, *lpr;
29
30 #define CMD_PTR (lls_cmd(0, gui_suite))
31 #define OPT_RESULT(_name) (lls_opt_result(LSG_GUI_PARA_GUI_OPT_ ## _name, lpr))
32 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
33 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
34 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
35 #define FOR_EACH_KEY_MAP(_i) for (_i = 0; _i < OPT_GIVEN(KEY_MAP); _i++)
36
37 static char *stat_content[NUM_STAT_ITEMS];
38
39 static struct gui_window {
40 WINDOW *win;
41 bool needs_update;
42 } top, bot, sb, in, sep;
43
44 /** How many lines of output to remember. */
45 #define RINGBUFFER_SIZE 512
46
47 struct rb_entry {
48 char *msg;
49 size_t len;
50 int color;
51 };
52 static struct ringbuffer *bot_win_rb;
53
54 static unsigned scroll_position;
55 static pid_t exec_pid;
56 static int exec_fds[2] = {-1, -1};
57 static int loglevel;
58
59 /** Type of the process currently being executed. */
60 enum exec_status {
61 EXEC_IDLE, /**< No process running. */
62 EXEC_DCMD, /**< para or display process running. */
63 EXEC_XCMD, /**< External process running. */
64 };
65
66 /**
67 * Codes for various colors.
68 *
69 * Each status item has its own color pair. The ones defined here start at a
70 * higher number so that they do not overlap with these.
71 */
72 enum gui_color_pair {
73 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
74 COLOR_COMMAND,
75 COLOR_OUTPUT,
76 COLOR_MSG,
77 COLOR_ERRMSG,
78 COLOR_SEPARATOR,
79 COLOR_TOP,
80 COLOR_BOT,
81 };
82
83 struct gui_command {
84 const char *key;
85 const char *name;
86 const char *description;
87 void (*handler)(void);
88 };
89
90 static struct gui_theme theme;
91
92 #define GUI_COMMANDS \
93 GUI_COMMAND(help, "?", "print help") \
94 GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
95 GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
96 GUI_COMMAND(reread_conf, "r", "reread configuration file") \
97 GUI_COMMAND(quit, "q", "exit para_gui") \
98 GUI_COMMAND(refresh, "^L", "redraw the screen") \
99 GUI_COMMAND(next_theme, ".", "switch to next theme") \
100 GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
101 GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
102 GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
103 GUI_COMMAND(version, "V", "show the para_gui version") \
104 GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
105 GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
106 GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
107 GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
108 GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
109 GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
110
111 /* declare command handlers */
112 #define GUI_COMMAND(_c, _k, _d) \
113 static void com_ ## _c(void);
114 GUI_COMMANDS
115
116 #undef GUI_COMMAND
117
118 /* define command array */
119 #define GUI_COMMAND(_c, _k, _d) \
120 { \
121 .key = _k, \
122 .name = #_c, \
123 .description = _d, \
124 .handler = com_ ## _c \
125 },
126
127 static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
128
129 struct input_task {
130 struct task *task;
131 };
132
133 struct status_task {
134 struct task *task;
135 pid_t pid;
136 char *buf;
137 int bufsize, loaded;
138 struct timeval next_exec;
139 int fd;
140 };
141
142 /** Stdout/stderr of the executing process is read in chunks of this size. */
143 #define COMMAND_BUF_SIZE 32768
144
145 struct exec_task {
146 struct task *task;
147 char command_buf[2][COMMAND_BUF_SIZE]; /* stdout/stderr of command */
148 int cbo[2]; /* command buf offsets */
149 unsigned flags[2]; /* passed to for_each_line() */
150 };
151
152 static int find_cmd_byname(const char *name)
153 {
154 int i;
155
156 for (i = 0; command_list[i].handler; i++)
157 if (!strcmp(command_list[i].name, name))
158 return i;
159 return -1;
160 }
161
162 /*
163 * Even though ncurses provides getmaxx and getmaxy, these functions/macros are
164 * not described in the XSI Curses standard.
165 */
166 static int get_num_lines(struct gui_window *w)
167 {
168 int lines;
169 __a_unused int cols; /* avoid "set but not used" warnings */
170
171 getmaxyx(w->win, lines, cols);
172 return lines;
173 }
174
175 static int get_num_cols(struct gui_window *w)
176 {
177 __a_unused int lines; /* avoid "set but not used" warnings */
178 int cols;
179
180 getmaxyx(w->win, lines, cols);
181 return cols;
182 }
183
184 /** Number of lines of the window are occupied by an output line. */
185 #define NUM_LINES(len) (1 + (len) / get_num_cols(&bot))
186
187 /* isendwin() returns false before initscr() was called */
188 static bool curses_active(void)
189 {
190 return top.win && !isendwin();
191 }
192
193 /* taken from mutt */
194 static char *km_keyname(int c)
195 {
196 static char buf[10];
197
198 if (c == KEY_UP) {
199 sprintf(buf, "<up>");
200 return buf;
201 }
202 if (c == KEY_DOWN) {
203 sprintf(buf, "<down>");
204 return buf;
205 }
206 if (c == KEY_LEFT) {
207 sprintf(buf, "<left>");
208 return buf;
209 }
210 if (c == KEY_RIGHT) {
211 sprintf(buf, "<right>");
212 return buf;
213 }
214 if (c == KEY_NPAGE) {
215 sprintf(buf, "<npage>");
216 return buf;
217 }
218 if (c == KEY_PPAGE) {
219 sprintf(buf, "<ppage>");
220 return buf;
221 }
222 if (c == KEY_HOME) {
223 sprintf(buf, "<home>");
224 return buf;
225 }
226 if (c == KEY_END) {
227 sprintf(buf, "<end>");
228 return buf;
229 }
230 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
231 if (c < 0)
232 c += 256;
233 if (c < 128) {
234 buf[0] = '^';
235 buf[1] = (c + '@') & 0x7f;
236 buf[2] = 0;
237 } else
238 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
239 (c >> 3) & 7, c & 7);
240 } else if (c >= KEY_F0 && c < KEY_F(256))
241 sprintf(buf, "<F%d>", c - KEY_F0);
242 else if (isprint(c))
243 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
244 else
245 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
246 return buf;
247 }
248
249 /* Print given number of spaces to curses window. */
250 static void add_spaces(WINDOW *win, unsigned int num)
251 {
252 const char space[] = " ";
253 const unsigned sz = sizeof(space) - 1; /* number of spaces */
254
255 while (num >= sz) {
256 waddstr(win, space);
257 num -= sz;
258 }
259 if (num > 0) {
260 assert(num < sz);
261 waddstr(win, space + sz - num);
262 }
263 }
264
265 /*
266 * Print aligned string to curses window. This function always prints
267 * exactly len chars.
268 */
269 static int align_str(WINDOW *win, const char *str, unsigned int len,
270 unsigned int align)
271 {
272 int ret, num; /* of spaces */
273 size_t width;
274 char *sstr; /* sanitized string */
275
276 if (!win || !str)
277 return 0;
278 ret = sanitize_str(str, len, &sstr, &width);
279 if (ret < 0) {
280 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
281 width = 0;
282 sstr = para_strdup(NULL);
283 }
284 assert(width <= len);
285 num = len - width;
286 if (align == LEFT) {
287 waddstr(win, sstr);
288 add_spaces(win, num);
289 } else if (align == RIGHT) {
290 add_spaces(win, num);
291 waddstr(win, sstr);
292 } else {
293 add_spaces(win, num / 2);
294 waddstr(win, sstr);
295 add_spaces(win, num - num / 2);
296 }
297 free(sstr);
298 return 1;
299 }
300
301 static void refresh_window(struct gui_window *gw)
302 {
303 gw->needs_update = true;
304 }
305
306 static bool window_update_needed(void)
307 {
308 return top.needs_update || bot.needs_update || sb.needs_update ||
309 in.needs_update || sep.needs_update;
310 }
311
312 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
313 {
314 char *msg;
315 va_list ap;
316
317 if (!curses_active())
318 return;
319 wattron(in.win, COLOR_PAIR(color));
320 va_start(ap, fmt);
321 xvasprintf(&msg, fmt, ap);
322 va_end(ap);
323 wmove(in.win, 0, 0);
324 align_str(in.win, msg, get_num_cols(&in), LEFT);
325 free(msg);
326 refresh_window(&in);
327 }
328
329 static void print_status_bar(void)
330 {
331 char *tmp;
332
333 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
334 wmove(sb.win, 0, 0);
335 align_str(sb.win, tmp, get_num_cols(&sb), CENTER);
336 free(tmp);
337 }
338
339 /*
340 * get the number of the oldest rbe that is (partially) visible. On return,
341 * lines contains the sum of the number of lines of all visible entries. If the
342 * first one is only partially visible, lines is greater than bot.lines.
343 */
344 static int first_visible_rbe(unsigned *lines)
345 {
346 int i, bot_lines = get_num_lines(&bot);
347
348 *lines = 0;
349 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
350 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
351 int rbe_lines;
352 if (!rbe)
353 return i - 1;
354 rbe_lines = NUM_LINES(rbe->len);
355 if (rbe_lines > bot_lines)
356 return -1;
357 *lines += rbe_lines;
358 if (*lines >= bot_lines)
359 return i;
360 }
361 return RINGBUFFER_SIZE - 1;
362 }
363
364 /*
365 returns number of first visible rbe, *lines is the number of lines drawn.
366 */
367 static int draw_top_rbe(unsigned *lines)
368 {
369 int bot_cols, bot_lines, ret, fvr = first_visible_rbe(lines);
370 struct rb_entry *rbe;
371 size_t bytes_to_skip, cells_to_skip, width;
372
373 if (fvr < 0)
374 return -1;
375 wmove(bot.win, 0, 0);
376 rbe = ringbuffer_get(bot_win_rb, fvr);
377 if (!rbe)
378 return -1;
379 getmaxyx(bot.win, bot_lines, bot_cols);
380 if (*lines > bot_lines) {
381 /* rbe is partially visible multi-line */
382 cells_to_skip = (*lines - bot_lines) * bot_cols;
383 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
384 if (ret < 0)
385 return ret;
386 ret = strwidth(rbe->msg + bytes_to_skip, &width);
387 if (ret < 0)
388 return ret;
389 } else {
390 bytes_to_skip = 0;
391 width = rbe->len;
392 }
393 wattron(bot.win, COLOR_PAIR(rbe->color));
394 waddstr(bot.win, rbe->msg + bytes_to_skip);
395 *lines = NUM_LINES(width);
396 return fvr;
397 }
398
399 static void redraw_bot_win(void)
400 {
401 unsigned lines;
402 int i, bot_lines = get_num_lines(&bot);
403
404 wmove(bot.win, 0, 0);
405 wclear(bot.win);
406 i = draw_top_rbe(&lines);
407 if (i <= 0)
408 goto out;
409 while (i > 0 && lines < bot_lines) {
410 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
411 if (!rbe) {
412 lines++;
413 waddstr(bot.win, "\n");
414 continue;
415 }
416 lines += NUM_LINES(rbe->len);
417 wattron(bot.win, COLOR_PAIR(rbe->color));
418 waddstr(bot.win, "\n");
419 waddstr(bot.win, rbe->msg);
420 }
421 out:
422 refresh_window(&bot);
423 }
424
425 static void rb_add_entry(int color, char *msg)
426 {
427 struct rb_entry *old, *new;
428 int x, y;
429 size_t len;
430
431 if (strwidth(msg, &len) < 0)
432 return;
433 new = para_malloc(sizeof(struct rb_entry));
434 new->color = color;
435 new->len = len;
436 new->msg = msg;
437 old = ringbuffer_add(bot_win_rb, new);
438 if (old) {
439 free(old->msg);
440 free(old);
441 }
442 if (scroll_position) {
443 /* discard current scrolling, like xterm does */
444 scroll_position = 0;
445 redraw_bot_win();
446 return;
447 }
448 wattron(bot.win, COLOR_PAIR(color));
449 getyx(bot.win, y, x);
450 if (y || x)
451 waddstr(bot.win, "\n");
452 waddstr(bot.win, msg);
453 }
454
455 /* Print formatted output to bot win and refresh. */
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
500 /** The log function of para_gui, always set to curses_log(). */
501 __printf_2_3 void (*para_log)(int, const char *, ...) = curses_log;
502
503 /* Call endwin() to reset the terminal into non-visual mode. */
504 static void shutdown_curses(void)
505 {
506 /*
507 * If para_gui received a terminating signal in external mode, the
508 * terminal can be in an unusable state at this point because the child
509 * process might not have caught the signal. In this case endwin() has
510 * already been called and must not be called again. So we first return
511 * to program mode, then call endwin().
512 */
513 if (!curses_active())
514 reset_prog_mode();
515 endwin();
516 }
517
518 /* Disable curses, print a message, kill running processes and exit. */
519 __noreturn __printf_2_3 static void die(int exit_code, const char *fmt, ...)
520 {
521 va_list argp;
522
523 /* Kill every process in our process group. */
524 para_sigaction(SIGTERM, SIG_IGN);
525 kill(0, SIGTERM);
526 /* Wait up to two seconds for child processes to die. */
527 alarm(2);
528 while (waitpid(0, NULL, 0) >= 0)
529 ; /* nothing */
530 alarm(0);
531 /* mousemask() exists only in ncurses */
532 #ifdef NCURSES_MOUSE_VERSION
533 mousemask(~(mmask_t)0, NULL); /* Avoid bad terminal state with xterm. */
534 #endif
535 shutdown_curses();
536 va_start(argp, fmt);
537 vfprintf(stderr, fmt, argp);
538 va_end(argp);
539 exit(exit_code);
540 }
541
542 /* Print stat item #i to curses window. */
543 static void print_stat_item(int i)
544 {
545 char *tmp;
546 struct stat_item_data d = theme.data[i];
547 char *c = stat_content[i];
548 int top_lines = get_num_lines(&top);
549
550 if (!curses_active() || !d.len || !c)
551 return;
552 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
553 wmove(top.win, d.y * top_lines / 100, d.x * COLS / 100);
554 wattron(top.win, COLOR_PAIR(i + 1));
555 align_str(top.win, tmp, d.len * COLS / 100, d.align);
556 free(tmp);
557 refresh_window(&top);
558 }
559
560 static int update_item(int item_num, char *buf)
561 {
562 char **c = stat_content + item_num;
563
564 free(*c);
565 if (buf && buf[0])
566 goto dup;
567 switch (item_num) {
568 case SI_artist:
569 *c = para_strdup("(artist tag not set)");
570 goto print;
571 case SI_title:
572 *c = para_strdup("(title tag not set)");
573 goto print;
574 case SI_year:
575 *c = para_strdup("????");
576 goto print;
577 case SI_album:
578 *c = para_strdup("(album tag not set)");
579 goto print;
580 case SI_comment:
581 *c = para_strdup("(comment tag not set)");
582 goto print;
583 }
584 dup:
585 *c = para_strdup(buf);
586 print:
587 print_stat_item(item_num);
588 return 1;
589 }
590
591 static void print_all_items(void)
592 {
593 int i;
594
595 if (!curses_active())
596 return;
597 FOR_EACH_STATUS_ITEM(i)
598 print_stat_item(i);
599 }
600
601 static void clear_all_items(void)
602 {
603 int i;
604
605 FOR_EACH_STATUS_ITEM(i) {
606 free(stat_content[i]);
607 stat_content[i] = para_strdup("");
608 }
609 }
610
611 static void status_pre_select(struct sched *s, void *context)
612 {
613 struct status_task *st = context;
614
615 if (st->fd >= 0)
616 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
617 if (task_get_notification(st->task) < 0)
618 return sched_min_delay(s);
619 if (st->fd < 0)
620 sched_request_barrier_or_min_delay(&st->next_exec, s);
621 }
622
623 static int status_post_select(struct sched *s, void *context)
624 {
625 struct status_task *st = context;
626 size_t sz;
627 int ret, ret2;
628
629 ret = task_get_notification(st->task);
630 if (ret == -E_GUI_SIGCHLD && st->pid > 0) {
631 int exit_status;
632 if (waitpid(st->pid, &exit_status, WNOHANG) == st->pid) {
633 st->pid = 0;
634 PARA_ERROR_LOG("stat command exit status: %d",
635 exit_status);
636 }
637 }
638 if (st->fd < 0) {
639 int fds[3] = {0, 1, 0};
640 if (st->pid > 0)
641 return 0;
642 /* Avoid busy loop */
643 if (tv_diff(&st->next_exec, now, NULL) > 0)
644 return 0;
645 st->next_exec.tv_sec = now->tv_sec + 2;
646 ret = para_exec_cmdline_pid(&st->pid,
647 OPT_STRING_VAL(STAT_CMD), 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 /* Initialize all windows. */
693 static void init_wins(int top_lines)
694 {
695 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
696 in_y = LINES - 1, sep_y = top_lines;
697 int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
698 sep_lines = 1;
699
700 assume_default_colors(theme.dflt.fg, theme.dflt.bg);
701 if (top.win) {
702 wresize(top.win, top_lines, COLS);
703 mvwin(top.win, top_y, 0);
704
705 wresize(sb.win, sb_lines, COLS);
706 mvwin(sb.win, sb_y, 0);
707
708 wresize(sep.win, sep_lines, COLS);
709 mvwin(sep.win, sep_y, 0);
710
711 wresize(bot.win, bot_lines, COLS);
712 mvwin(bot.win, bot_y, 0);
713
714 wresize(in.win, in_lines, COLS);
715 mvwin(in.win, in_y, 0);
716 } else {
717 sep.win = newwin(sep_lines, COLS, sep_y, 0);
718 top.win = newwin(top_lines, COLS, top_y, 0);
719 bot.win = newwin(bot_lines, COLS, bot_y, 0);
720 sb.win = newwin(sb_lines, COLS, sb_y, 0);
721 in.win = newwin(in_lines, COLS, in_y, 0);
722 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
723 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
724 wclear(bot.win);
725 wclear(sb.win);
726 wclear(in.win);
727 scrollok(bot.win, 1);
728 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
729 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
730 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
731 wattron(top.win, COLOR_PAIR(COLOR_TOP));
732 nodelay(top.win, 1);
733 nodelay(bot.win, 1);
734 nodelay(sb.win, 1);
735 nodelay(in.win, 0);
736
737 keypad(top.win, 1);
738 keypad(bot.win, 1);
739 keypad(sb.win, 1);
740 keypad(in.win, 1);
741 }
742 wmove(sep.win, 0, 0);
743 whline(sep.win, theme.sep_char, COLS);
744 wclear(top.win);
745 print_all_items();
746 //wclear(bot.win);
747 wnoutrefresh(top.win);
748 wnoutrefresh(bot.win);
749 print_status_bar();
750 wnoutrefresh(sb.win);
751 wnoutrefresh(in.win);
752 wnoutrefresh(sep.win);
753 doupdate();
754 }
755
756 static void init_pair_or_die(short pair, short f, short b)
757 {
758 if (init_pair(pair, f, b) == ERR)
759 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
760 }
761
762 static void init_colors_or_die(void)
763 {
764 int i;
765
766 if (!has_colors())
767 die(EXIT_FAILURE, "fatal: No color term\n");
768 if (start_color() == ERR)
769 die(EXIT_FAILURE, "fatal: failed to start colors\n");
770 FOR_EACH_STATUS_ITEM(i)
771 if (theme.data[i].len)
772 init_pair_or_die(i + 1, theme.data[i].color.fg,
773 theme.data[i].color.bg);
774 init_pair_or_die(COLOR_STATUSBAR, theme.sb.fg, theme.sb.bg);
775 init_pair_or_die(COLOR_COMMAND, theme.cmd.fg, theme.cmd.bg);
776 init_pair_or_die(COLOR_OUTPUT, theme.output.fg, theme.output.bg);
777 init_pair_or_die(COLOR_MSG, theme.msg.fg, theme.msg.bg);
778 init_pair_or_die(COLOR_ERRMSG, theme.err_msg.fg, theme.err_msg.bg);
779 init_pair_or_die(COLOR_SEPARATOR, theme.sep.fg, theme.sep.bg);
780 init_pair_or_die(COLOR_TOP, theme.dflt.fg, theme.dflt.bg);
781 init_pair_or_die(COLOR_BOT, theme.dflt.fg, theme.dflt.bg);
782 }
783
784 /* (Re-)initialize the curses library. */
785 static void init_curses(void)
786 {
787 if (curses_active())
788 return;
789 if (refresh() == ERR) /* refresh is really needed */
790 die(EXIT_FAILURE, "refresh() failed\n");
791 if (LINES < theme.lines_min || COLS < theme.cols_min)
792 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
793 " (need at least %dx%d)\n", COLS, LINES,
794 theme.cols_min, theme.lines_min);
795 curs_set(0); /* make cursor invisible, ignore errors */
796 nonl(); /* do not NL->CR/NL on output, always returns OK */
797 /* don't echo input */
798 if (noecho() == ERR)
799 die(EXIT_FAILURE, "fatal: noecho() failed\n");
800 /* take input chars one at a time, no wait for \n */
801 if (cbreak() == ERR)
802 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
803 init_colors_or_die();
804 clear(); /* ignore non-fatal errors */
805 init_wins(theme.top_lines_default);
806 // noecho(); /* don't echo input */
807 }
808
809 /*
810 * This sucker modifies its first argument. *handler and *arg are
811 * pointers to 0-terminated strings (inside line). Crap.
812 */
813 static int split_key_map(char *line, char **handler, char **arg)
814 {
815 if (!(*handler = strchr(line + 1, ':')))
816 goto err_out;
817 **handler = '\0';
818 (*handler)++;
819 if (!(*arg = strchr(*handler, ':')))
820 goto err_out;
821 **arg = '\0';
822 (*arg)++;
823 return 1;
824 err_out:
825 return 0;
826 }
827
828 static void check_key_map_args_or_die(void)
829 {
830 int i;
831 char *tmp = NULL;
832 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
833
834 FOR_EACH_KEY_MAP(i) {
835 char *handler, *arg;
836
837 free(tmp);
838 tmp = para_strdup(lls_string_val(i, lor));
839 if (!split_key_map(tmp, &handler, &arg))
840 break;
841 if (strlen(handler) != 1)
842 break;
843 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
844 && *handler != 'p')
845 break;
846 if (*handler != 'i')
847 continue;
848 if (find_cmd_byname(arg) < 0)
849 break;
850 }
851 if (i != OPT_GIVEN(KEY_MAP))
852 die(EXIT_FAILURE, "invalid key map: %s\n",
853 lls_string_val(i, lor));
854 free(tmp);
855 }
856
857 static void parse_config_file_or_die(bool reload)
858 {
859 int ret;
860 char *cf = NULL, *errctx = NULL;
861 void *map;
862 size_t sz;
863 int cf_argc;
864 char **cf_argv;
865 struct lls_parse_result *cf_lpr, *merged_lpr;
866
867 if (OPT_GIVEN(CONFIG_FILE))
868 cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
869 else {
870 char *home = para_homedir();
871 cf = make_message("%s/.paraslash/gui.conf", home);
872 free(home);
873 }
874 ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
875 if (ret < 0) {
876 if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
877 goto free_cf;
878 if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) && OPT_GIVEN(CONFIG_FILE))
879 goto free_cf;
880 ret = 0;
881 lpr = cmdline_lpr;
882 goto success;
883 }
884 ret = lls(lls_convert_config(map, sz, NULL, &cf_argv, &errctx));
885 para_munmap(map, sz);
886 if (ret < 0)
887 goto free_cf;
888 cf_argc = ret;
889 ret = lls(lls_parse(cf_argc, cf_argv, CMD_PTR, &cf_lpr, &errctx));
890 lls_free_argv(cf_argv);
891 if (ret < 0)
892 goto free_cf;
893 if (reload) /* config file overrides command line */
894 ret = lls(lls_merge(cf_lpr, cmdline_lpr, CMD_PTR, &merged_lpr,
895 &errctx));
896 else /* command line options override config file options */
897 ret = lls(lls_merge(cmdline_lpr, cf_lpr, CMD_PTR, &merged_lpr,
898 &errctx));
899 lls_free_parse_result(cf_lpr, CMD_PTR);
900 if (ret < 0)
901 goto free_cf;
902 if (lpr != cmdline_lpr)
903 lls_free_parse_result(lpr, CMD_PTR);
904 lpr = merged_lpr;
905 success:
906 loglevel = OPT_UINT32_VAL(LOGLEVEL);
907 check_key_map_args_or_die();
908 theme_init(OPT_STRING_VAL(THEME), &theme);
909 free_cf:
910 free(cf);
911 if (ret < 0) {
912 if (errctx)
913 PARA_ERROR_LOG("%s\n", errctx);
914 free(errctx);
915 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
916 exit(EXIT_FAILURE);
917 }
918 }
919
920 /* Reread configuration, terminate on errors. */
921 static void reread_conf(void)
922 {
923 /*
924 * If the reload of the config file fails, we are about to exit. In
925 * this case we print the error message to stderr rather than to the
926 * curses window. So we have to shutdown curses first.
927 */
928 shutdown_curses();
929 parse_config_file_or_die(true);
930 init_curses();
931 print_in_bar(COLOR_MSG, "config file reloaded\n");
932 }
933
934 /* React to various signal-related events. */
935 static int signal_post_select(struct sched *s, __a_unused void *context)
936 {
937 int ret = para_next_signal(&s->rfds);
938
939 if (ret <= 0)
940 return 0;
941 switch (ret) {
942 case SIGTERM:
943 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
944 case SIGWINCH:
945 PARA_NOTICE_LOG("got SIGWINCH\n");
946 if (curses_active()) {
947 shutdown_curses();
948 init_curses();
949 redraw_bot_win();
950 }
951 return 1;
952 case SIGINT:
953 return 1;
954 case SIGUSR1:
955 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
956 reread_conf();
957 return 1;
958 case SIGCHLD:
959 task_notify_all(s, E_GUI_SIGCHLD);
960 return 1;
961 }
962 return 1;
963 }
964
965 static enum exec_status exec_status(void)
966 {
967 if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
968 return EXEC_DCMD;
969 if (exec_pid > 0)
970 return EXEC_XCMD;
971 return EXEC_IDLE;
972 }
973
974 static void exec_pre_select(struct sched *s, void *context)
975 {
976 struct exec_task *et = context;
977 if (exec_fds[0] >= 0)
978 para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
979 if (exec_fds[1] >= 0)
980 para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
981 if (task_get_notification(et->task) < 0)
982 sched_min_delay(s);
983 }
984
985 static int exec_post_select(struct sched *s, void *context)
986 {
987 struct exec_task *ct = context;
988 int i, ret;
989
990 ret = task_get_notification(ct->task);
991 if (ret == -E_GUI_SIGCHLD && exec_pid > 0) {
992 int exit_status;
993 if (waitpid(exec_pid, &exit_status, WNOHANG) == exec_pid) {
994 exec_pid = 0;
995 init_curses();
996 PARA_INFO_LOG("command exit status: %d", exit_status);
997 print_in_bar(COLOR_MSG, " ");
998 }
999 }
1000 for (i = 0; i < 2; i++) {
1001 size_t sz;
1002 if (exec_fds[i] < 0)
1003 continue;
1004 ret = read_nonblock(exec_fds[i],
1005 ct->command_buf[i] + ct->cbo[i],
1006 COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
1007 ct->cbo[i] += sz;
1008 sz = ct->cbo[i];
1009 ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
1010 ct->cbo[i], add_output_line, &i);
1011 if (sz != ct->cbo[i]) { /* at least one line found */
1012 refresh_window(&bot);
1013 ct->flags[i] = 0;
1014 }
1015 if (ret < 0 || exec_pid == 0) {
1016 if (ret < 0)
1017 PARA_NOTICE_LOG("closing command fd %d: %s",
1018 i, para_strerror(-ret));
1019 close(exec_fds[i]);
1020 exec_fds[i] = -1;
1021 ct->flags[i] = 0;
1022 ct->cbo[i] = 0;
1023 if (exec_fds[!i] < 0) /* both fds closed */
1024 return 1;
1025 }
1026 if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
1027 PARA_NOTICE_LOG("discarding overlong line");
1028 ct->cbo[i] = 0;
1029 ct->flags[i] = FELF_DISCARD_FIRST;
1030 }
1031 }
1032 return 0;
1033 }
1034
1035 static void input_pre_select(struct sched *s, __a_unused void *context)
1036 {
1037 if (exec_status() != EXEC_XCMD)
1038 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
1039 if (window_update_needed())
1040 sched_min_delay(s);
1041 }
1042
1043 /* Read from command pipe and print data to bot window. */
1044 static void exec_and_display(const char *file_and_args)
1045 {
1046 int ret, fds[3] = {0, 1, 1};
1047
1048 outputf(COLOR_COMMAND, "%s", file_and_args);
1049 ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1050 if (ret < 0)
1051 return;
1052 ret = mark_fd_nonblocking(fds[1]);
1053 if (ret < 0)
1054 goto fail;
1055 ret = mark_fd_nonblocking(fds[2]);
1056 if (ret < 0)
1057 goto fail;
1058 exec_fds[0] = fds[1];
1059 exec_fds[1] = fds[2];
1060 print_in_bar(COLOR_MSG, "hit any key to abort\n");
1061 return;
1062 fail:
1063 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1064 close(exec_fds[0]);
1065 close(exec_fds[1]);
1066 }
1067
1068 static void exec_para(const char *args)
1069 {
1070 char *file_and_args;
1071
1072 file_and_args = make_message(BINDIR "/para_client -- %s", args);
1073 exec_and_display(file_and_args);
1074 free(file_and_args);
1075 }
1076
1077 /* Shutdown curses and stat pipe before executing external commands. */
1078 static void exec_external(char *file_and_args)
1079 {
1080 int fds[3] = {-1, -1, -1};
1081
1082 if (exec_pid)
1083 return;
1084 shutdown_curses();
1085 para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1086 }
1087
1088 static void handle_command(int c)
1089 {
1090 int i;
1091 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
1092
1093 /* first check user-defined key bindings */
1094 FOR_EACH_KEY_MAP(i) {
1095 char *tmp, *handler, *arg;
1096
1097 tmp = para_strdup(lls_string_val(i, lor));
1098 if (!split_key_map(tmp, &handler, &arg)) {
1099 free(tmp);
1100 return;
1101 }
1102 if (strcmp(tmp, km_keyname(c))) {
1103 free(tmp);
1104 continue;
1105 }
1106 if (*handler == 'd')
1107 exec_and_display(arg);
1108 else if (*handler == 'x')
1109 exec_external(arg);
1110 else if (*handler == 'p')
1111 exec_para(arg);
1112 else if (*handler == 'i') {
1113 int num = find_cmd_byname(arg);
1114 if (num >= 0)
1115 command_list[num].handler();
1116 }
1117 free(tmp);
1118 return;
1119 }
1120 /* not found, check internal key bindings */
1121 for (i = 0; command_list[i].handler; i++) {
1122 if (!strcmp(km_keyname(c), command_list[i].key)) {
1123 command_list[i].handler();
1124 return;
1125 }
1126 }
1127 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1128 km_keyname(c));
1129 }
1130
1131 static int input_post_select(__a_unused struct sched *s,
1132 __a_unused void *context)
1133 {
1134 int ret;
1135 enum exec_status exs = exec_status();
1136
1137 if (exs == EXEC_XCMD)
1138 return 0;
1139 if (window_update_needed()) {
1140 if (top.needs_update)
1141 assert(wnoutrefresh(top.win) == OK);
1142 if (bot.needs_update)
1143 assert(wnoutrefresh(bot.win) == OK);
1144 if (sep.needs_update)
1145 assert(wnoutrefresh(sep.win) == OK);
1146 if (sb.needs_update)
1147 assert(wnoutrefresh(sb.win) == OK);
1148 if (in.needs_update)
1149 assert(wnoutrefresh(in.win) == OK);
1150 doupdate();
1151 top.needs_update = bot.needs_update = sb.needs_update =
1152 in.needs_update = sep.needs_update = false;
1153 }
1154 ret = wgetch(top.win);
1155 if (ret == ERR)
1156 return 0;
1157 if (ret == KEY_RESIZE) /* already handled in signal_post_select() */
1158 return 0;
1159 if (exs == EXEC_IDLE)
1160 handle_command(ret);
1161 else if (exec_pid > 0)
1162 kill(exec_pid, SIGTERM);
1163 return 0;
1164 }
1165
1166 static void print_scroll_msg(void)
1167 {
1168 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1169 int first_rbe = first_visible_rbe(&lines_total);
1170
1171 print_in_bar(COLOR_MSG, "scrolled view: %u-%u/%u\n", filled - first_rbe,
1172 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1173 }
1174
1175 static void com_scroll_top(void)
1176 {
1177 int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
1178 unsigned lines = 0;
1179
1180 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1181 i--;
1182 /* i is oldest entry */
1183 for (; lines < bot_lines && i >= 0; i--) {
1184 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1185 if (!rbe)
1186 break;
1187 lines += NUM_LINES(rbe->len);
1188 }
1189 i++;
1190 if (lines > 0 && scroll_position != i) {
1191 scroll_position = i;
1192 redraw_bot_win();
1193 print_scroll_msg();
1194 return;
1195 }
1196 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1197 }
1198
1199 static void com_cancel_scroll(void)
1200 {
1201
1202 if (scroll_position == 0) {
1203 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1204 return;
1205 }
1206 scroll_position = 0;
1207 redraw_bot_win();
1208 }
1209
1210 static void com_page_down(void)
1211 {
1212 unsigned lines = 0;
1213 int i = scroll_position, bot_lines = get_num_lines(&bot);
1214
1215 while (lines < bot_lines && --i > 0) {
1216 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1217 if (!rbe)
1218 break;
1219 lines += NUM_LINES(rbe->len);
1220 }
1221 if (lines) {
1222 scroll_position = i;
1223 redraw_bot_win();
1224 print_scroll_msg();
1225 return;
1226 }
1227 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1228 }
1229
1230 static void com_page_up(void)
1231 {
1232 unsigned lines;
1233 int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
1234
1235 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1236 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1237 return;
1238 }
1239 scroll_position = fvr + 1;
1240 for (; scroll_position > 0; scroll_position--) {
1241 first_visible_rbe(&lines);
1242 if (lines == bot_lines)
1243 break;
1244 }
1245 redraw_bot_win();
1246 print_scroll_msg();
1247 }
1248
1249 static void com_scroll_down(void)
1250 {
1251 struct rb_entry *rbe;
1252 int rbe_lines, bot_lines = get_num_lines(&bot);
1253
1254 if (!scroll_position) {
1255 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1256 return;
1257 }
1258 scroll_position--;
1259 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1260 rbe_lines = NUM_LINES(rbe->len);
1261 wscrl(bot.win, rbe_lines);
1262 wmove(bot.win, bot_lines - rbe_lines, 0);
1263 wattron(bot.win, COLOR_PAIR(rbe->color));
1264 waddstr(bot.win, rbe->msg);
1265 refresh_window(&bot);
1266 print_scroll_msg();
1267 }
1268
1269 static void com_scroll_up(void)
1270 {
1271 struct rb_entry *rbe = NULL;
1272 unsigned lines;
1273 int i, first_rbe, num_scroll;
1274
1275 /* the entry that is going to vanish */
1276 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1277 if (!rbe)
1278 goto err_out;
1279 num_scroll = NUM_LINES(rbe->len);
1280 first_rbe = first_visible_rbe(&lines);
1281 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1282 goto err_out;
1283 scroll_position++;
1284 wscrl(bot.win, -num_scroll);
1285 i = draw_top_rbe(&lines);
1286 if (i < 0)
1287 goto err_out;
1288 while (i > 0 && lines < num_scroll) {
1289 int rbe_lines;
1290 rbe = ringbuffer_get(bot_win_rb, --i);
1291 if (!rbe)
1292 break;
1293 rbe_lines = NUM_LINES(rbe->len);
1294 lines += rbe_lines;
1295 wattron(bot.win, COLOR_PAIR(rbe->color));
1296 waddstr(bot.win, "\n");
1297 waddstr(bot.win, rbe->msg);
1298 if (!i)
1299 break;
1300 i--;
1301 }
1302 refresh_window(&bot);
1303 print_scroll_msg();
1304 return;
1305 err_out:
1306 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1307 }
1308
1309 static void com_ll_decr(void)
1310 {
1311 if (loglevel <= LL_DEBUG) {
1312 print_in_bar(COLOR_ERRMSG,
1313 "loglevel already at maximal verbosity\n");
1314 return;
1315 }
1316 loglevel--;
1317 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1318 }
1319
1320 static void com_ll_incr(void)
1321 {
1322 if (loglevel >= LL_EMERG) {
1323 print_in_bar(COLOR_ERRMSG,
1324 "loglevel already at minimal verbosity\n");
1325 return;
1326 }
1327 loglevel++;
1328 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1329 }
1330
1331 static void com_reread_conf(void)
1332 {
1333 reread_conf();
1334 }
1335
1336 static void com_help(void)
1337 {
1338 int i;
1339 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
1340
1341 FOR_EACH_KEY_MAP(i) {
1342 char *handler, *arg, *tmp = para_strdup(lls_string_val(i, lor));
1343 const char *handler_text = "???", *desc = NULL;
1344
1345 if (!split_key_map(tmp, &handler, &arg)) {
1346 free(tmp);
1347 return;
1348 }
1349 switch (*handler) {
1350 case 'i':
1351 handler_text = "internal";
1352 desc = command_list[find_cmd_byname(arg)].description;
1353 break;
1354 case 'x': handler_text = "external"; break;
1355 case 'd': handler_text = "display "; break;
1356 case 'p': handler_text = "para "; break;
1357 }
1358 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1359 strlen(arg) < 8? "\t" : "",
1360 desc? desc : "");
1361 free(tmp);
1362 }
1363 for (i = 0; command_list[i].handler; i++) {
1364 struct gui_command gc = command_list[i];
1365
1366 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1367 strlen(gc.name) < 8? "\t" : "",
1368 gc.description);
1369 }
1370 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1371 "for more info");
1372 }
1373
1374 static void com_shrink_top_win(void)
1375 {
1376 int top_lines = get_num_lines(&top);
1377
1378 if (top_lines <= theme.top_lines_min) {
1379 PARA_WARNING_LOG("can not decrease top window\n");
1380 return;
1381 }
1382 init_wins(top_lines - 1);
1383 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1384 }
1385
1386 static void com_enlarge_top_win(void)
1387 {
1388 int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
1389
1390 if (bot_lines < 3) {
1391 PARA_WARNING_LOG("can not increase top window\n");
1392 return;
1393 }
1394 init_wins(top_lines + 1);
1395 print_in_bar(COLOR_MSG, "increased top window");
1396 }
1397
1398 static void com_version(void)
1399 {
1400 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1401 }
1402
1403 __noreturn static void com_quit(void)
1404 {
1405 die(EXIT_SUCCESS, "%s", "");
1406 }
1407
1408 static void com_refresh(void)
1409 {
1410 shutdown_curses();
1411 init_curses();
1412 }
1413
1414 static void com_next_theme(void)
1415 {
1416 theme_next(&theme);
1417 com_refresh();
1418 }
1419
1420 static void com_prev_theme(void)
1421 {
1422 theme_prev(&theme);
1423 com_refresh();
1424 }
1425
1426 static int setup_tasks_and_schedule(void)
1427 {
1428 int ret;
1429 struct exec_task exec_task = {.task = NULL};
1430 struct status_task status_task = {.fd = -1};
1431 struct input_task input_task = {.task = NULL};
1432 struct signal_task *signal_task;
1433 struct sched sched = {.default_timeout = {.tv_sec = 1}};
1434
1435 exec_task.task = task_register(&(struct task_info) {
1436 .name = "exec",
1437 .pre_select = exec_pre_select,
1438 .post_select = exec_post_select,
1439 .context = &exec_task,
1440 }, &sched);
1441
1442 status_task.task = task_register(&(struct task_info) {
1443 .name = "status",
1444 .pre_select = status_pre_select,
1445 .post_select = status_post_select,
1446 .context = &status_task,
1447 }, &sched);
1448
1449 input_task.task = task_register(&(struct task_info) {
1450 .name = "input",
1451 .pre_select = input_pre_select,
1452 .post_select = input_post_select,
1453 .context = &input_task,
1454 }, &sched);
1455
1456 signal_task = signal_init_or_die();
1457 para_install_sighandler(SIGINT);
1458 para_install_sighandler(SIGTERM);
1459 para_install_sighandler(SIGCHLD);
1460 para_install_sighandler(SIGUSR1);
1461 para_install_sighandler(SIGWINCH);
1462 signal_task->task = task_register(&(struct task_info) {
1463 .name = "signal",
1464 .pre_select = signal_pre_select,
1465 .post_select = signal_post_select,
1466 .context = signal_task,
1467 }, &sched);
1468 ret = schedule(&sched);
1469 sched_shutdown(&sched);
1470 signal_shutdown(signal_task);
1471 return ret;
1472 }
1473
1474 static void handle_help_flags(void)
1475 {
1476 char *help;
1477
1478 if (OPT_GIVEN(DETAILED_HELP))
1479 help = lls_long_help(CMD_PTR);
1480 else if (OPT_GIVEN(HELP))
1481 help = lls_short_help(CMD_PTR);
1482 else
1483 return;
1484 printf("%s\n", help);
1485 free(help);
1486 exit(EXIT_SUCCESS);
1487 }
1488
1489 /**
1490 * The main function of para_gui.
1491 *
1492 * \param argc Usual argument count.
1493 * \param argv Usual argument vector.
1494 *
1495 * After initialization para_gui registers the following tasks to the paraslash
1496 * scheduler: status, exec, signal, input.
1497 *
1498 * The status task executes the para_audioc stat command to obtain the status
1499 * of para_server and para_audiod, and displays this information in the top
1500 * window of para_gui.
1501 *
1502 * The exec task is responsible for printing the output of the currently
1503 * running executable to the bottom window.
1504 *
1505 * The signal task performs various actions according to signals received. For
1506 * example, it reloads the configuration file on SIGUSR1, and it shuts down the
1507 * curses system on SIGTERM to restore the terminal settings before exit.
1508 *
1509 * The input task reads single key strokes from stdin. For each key pressed, it
1510 * executes the command handler associated with this key.
1511 *
1512 * \return \p EXIT_SUCCESS or \p EXIT_FAILURE.
1513 */
1514 int main(int argc, char *argv[])
1515 {
1516 int ret;
1517 char *errctx;
1518
1519 ret = lls(lls_parse(argc, argv, CMD_PTR, &cmdline_lpr, &errctx));
1520 if (ret < 0)
1521 goto out;
1522 lpr = cmdline_lpr;
1523 loglevel = OPT_UINT32_VAL(LOGLEVEL);
1524 version_handle_flag("gui", OPT_GIVEN(VERSION));
1525 handle_help_flags();
1526 parse_config_file_or_die(false);
1527 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1528 setlocale(LC_CTYPE, "");
1529 initscr(); /* needed only once, always successful */
1530 init_curses();
1531 ret = setup_tasks_and_schedule();
1532 out:
1533 lls_free_parse_result(lpr, CMD_PTR);
1534 if (lpr != cmdline_lpr)
1535 lls_free_parse_result(cmdline_lpr, CMD_PTR);
1536 if (ret < 0) {
1537 if (errctx)
1538 PARA_ERROR_LOG("%s\n", errctx);
1539 free(errctx);
1540 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1541 }
1542 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;
1543 }