gui: Remove welcome message.
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2014 Andre Noll <maan@systemlinux.org>
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 int signal_pipe;
34
35 static struct gui_window {
36 WINDOW *win;
37 size_t begx;
38 size_t begy;
39 size_t cols;
40 size_t lines;
41 } top, bot, sb, in, sep;
42
43 #define RINGBUFFER_SIZE 512
44 struct rb_entry {
45 char *msg;
46 size_t len;
47 int color;
48 };
49 static struct ringbuffer *bot_win_rb;
50 #define NUM_LINES(len) (1 + (len) / bot.cols)
51
52 static unsigned scroll_position;
53
54 static bool curses_active;
55 static pid_t cmd_pid;
56
57 static int command_fds[2] = {-1, -1};
58 static int stat_pipe = -1;
59 static struct gui_args_info conf;
60
61 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
62
63
64 /**
65 * Codes for various colors.
66 *
67 * Each status item has its own color pair. The ones defined here start at a
68 * higher number so that they do not overlap with these.
69 */
70 enum gui_color_pair {
71 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
72 COLOR_COMMAND,
73 COLOR_OUTPUT,
74 COLOR_MSG,
75 COLOR_ERRMSG,
76 COLOR_SEPARATOR,
77 COLOR_TOP,
78 COLOR_BOT,
79 };
80
81 struct gui_command {
82 const char *key;
83 const char *name;
84 const char *description;
85 void (*handler)(void);
86 };
87
88 static struct gui_theme theme;
89
90 static int _argc;
91 static char **_argv;
92
93 static void com_help(void);
94 static void com_reread_conf(void);
95 static void com_enlarge_top_win(void);
96 static void com_shrink_top_win(void);
97 static void com_version(void);
98 __noreturn static void com_quit(void);
99 static void com_refresh(void);
100 static void com_ll_incr(void);
101 static void com_ll_decr(void);
102 static void com_prev_theme(void);
103 static void com_next_theme(void);
104 static void com_scroll_up(void);
105 static void com_scroll_down(void);
106 static void com_page_up(void);
107 static void com_page_down(void);
108 static void com_cancel_scrolling(void);
109 static void com_scroll_top(void);
110
111 static struct gui_command command_list[] = {
112 {
113 .key = "?",
114 .name = "help",
115 .description = "print help",
116 .handler = com_help
117 }, {
118 .key = "+",
119 .name = "enlarge_win",
120 .description = "enlarge the top window",
121 .handler = com_enlarge_top_win
122 }, {
123 .key = "-",
124 .name = "shrink_win",
125 .description = "shrink the top window",
126 .handler = com_shrink_top_win
127 }, {
128 .key = "r",
129 .name = "reread_conf",
130 .description = "reread configuration file",
131 .handler = com_reread_conf
132 }, {
133 .key = "q",
134 .name = "quit",
135 .description = "exit para_gui",
136 .handler = com_quit
137 }, {
138 .key = "^L",
139 .name = "refresh",
140 .description = "redraw the screen",
141 .handler = com_refresh
142 }, {
143 .key = ".",
144 .name = "next_theme",
145 .description = "switch to next theme",
146 .handler = com_next_theme
147 }, {
148 .key = ",",
149 .name = "prev_theme",
150 .description = "switch to previous stream",
151 .handler = com_prev_theme
152 }, {
153 .key = ">",
154 .name = "ll_incr",
155 .description = "increase loglevel (decreases verbosity)",
156 .handler = com_ll_incr
157 }, {
158 .key = "<",
159 .name = "ll_decr",
160 .description = "decrease loglevel (increases verbosity)",
161 .handler = com_ll_decr
162 }, {
163 .key = "V",
164 .name = "version",
165 .description = "show the para_gui version",
166 .handler = com_version
167 }, {
168 .key = "<up>",
169 .name = "scroll_up",
170 .description = "scroll up one line",
171 .handler = com_scroll_up
172 }, {
173 .key = "<down>",
174 .name = "scroll_down",
175 .description = "scroll down one line",
176 .handler = com_scroll_down
177 }, {
178 .key = "<ppage>",
179 .name = "page_up",
180 .description = "scroll up one page",
181 .handler = com_page_up
182 }, {
183 .key = "<npage>",
184 .name = "page_down",
185 .description = "scroll down one page",
186 .handler = com_page_down
187 }, {
188 .key = "<home>",
189 .name = "scroll_top",
190 .description = "scroll to top of buffer",
191 .handler = com_scroll_top
192 }, {
193 .key = "<end>",
194 .name = "cancel_scroll",
195 .description = "deactivate scroll mode",
196 .handler = com_cancel_scrolling
197 }, {
198 .handler = NULL
199 }
200 };
201
202 static int find_cmd_byname(char *name)
203 {
204 int i;
205
206 for (i = 0; command_list[i].handler; i++)
207 if (!strcmp(command_list[i].name, name))
208 return i;
209 return -1;
210 }
211
212 /* taken from mutt */
213 static char *km_keyname(int c)
214 {
215 static char buf[10];
216
217 if (c == KEY_UP) {
218 sprintf(buf, "<up>");
219 return buf;
220 }
221 if (c == KEY_DOWN) {
222 sprintf(buf, "<down>");
223 return buf;
224 }
225 if (c == KEY_LEFT) {
226 sprintf(buf, "<left>");
227 return buf;
228 }
229 if (c == KEY_RIGHT) {
230 sprintf(buf, "<right>");
231 return buf;
232 }
233 if (c == KEY_NPAGE) {
234 sprintf(buf, "<npage>");
235 return buf;
236 }
237 if (c == KEY_PPAGE) {
238 sprintf(buf, "<ppage>");
239 return buf;
240 }
241 if (c == KEY_HOME) {
242 sprintf(buf, "<home>");
243 return buf;
244 }
245 if (c == KEY_END) {
246 sprintf(buf, "<end>");
247 return buf;
248 }
249 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
250 if (c < 0)
251 c += 256;
252 if (c < 128) {
253 buf[0] = '^';
254 buf[1] = (c + '@') & 0x7f;
255 buf[2] = 0;
256 } else
257 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
258 (c >> 3) & 7, c & 7);
259 } else if (c >= KEY_F0 && c < KEY_F(256))
260 sprintf(buf, "<F%d>", c - KEY_F0);
261 else if (isprint(c))
262 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
263 else
264 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
265 return buf;
266 }
267
268 static char *configfile_exists(void)
269 {
270 static char *config_file;
271 char *tmp;
272
273 if (!conf.config_file_given) {
274 if (!config_file) {
275 char *home = para_homedir();
276 config_file = make_message("%s/.paraslash/gui.conf",
277 home);
278 free(home);
279 }
280 tmp = config_file;
281 } else
282 tmp = conf.config_file_arg;
283 return file_exists(tmp)? tmp: NULL;
284 }
285
286 /* Print given number of spaces to curses window. */
287 static void add_spaces(WINDOW* win, unsigned int num)
288 {
289 char space[] = " ";
290 unsigned sz = sizeof(space) - 1; /* number of spaces */
291
292 while (num >= sz) {
293 waddstr(win, space);
294 num -= sz;
295 }
296 if (num > 0) {
297 assert(num < sz);
298 space[num] = '\0';
299 waddstr(win, space);
300 }
301 }
302
303 /*
304 * print aligned string to curses window. This function always prints
305 * exactly len chars.
306 */
307 static int align_str(WINDOW* win, char *str, unsigned int len,
308 unsigned int align)
309 {
310 int ret, i, num; /* of spaces */
311 size_t width;
312
313 if (!win || !str)
314 return 0;
315 ret = strwidth(str, &width);
316 if (ret < 0) {
317 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
318 width = 0;
319 str[0] = '\0';
320 }
321 num = len - width;
322 if (num < 0) {
323 str[len] = '\0';
324 num = 0;
325 }
326 /* replace control characters by spaces */
327 for (i = 0; i < len && str[i]; i++) {
328 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
329 str[i] = ' ';
330 }
331 if (align == LEFT) {
332 waddstr(win, str);
333 add_spaces(win, num);
334 } else if (align == RIGHT) {
335 add_spaces(win, num);
336 waddstr(win, str);
337 } else {
338 add_spaces(win, num / 2);
339 waddstr(win, str[0]? str: "");
340 add_spaces(win, num - num / 2);
341 }
342 return 1;
343 }
344
345 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
346 {
347 char *msg;
348 va_list ap;
349
350 if (!curses_active)
351 return;
352 wattron(in.win, COLOR_PAIR(color));
353 va_start(ap, fmt);
354 xvasprintf(&msg, fmt, ap);
355 va_end(ap);
356 wmove(in.win, 0, 0);
357 align_str(in.win, msg, in.cols, LEFT);
358 free(msg);
359 wrefresh(in.win);
360 }
361
362 static void print_status_bar(void)
363 {
364 char *tmp;
365
366 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
367 wmove(sb.win, 0, 0);
368 align_str(sb.win, tmp, sb.cols, CENTER);
369 free(tmp);
370 }
371
372 /*
373 * get the number of the oldest rbe that is (partially) visible. On return,
374 * lines contains the sum of the number of lines of all visible entries. If the
375 * first one is only partially visible, lines is greater than bot.lines.
376 */
377 static int first_visible_rbe(unsigned *lines)
378 {
379 int i;
380 *lines = 0;
381 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
382 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
383 int rbe_lines;
384 if (!rbe)
385 return i - 1;
386 // fprintf(stderr, "found: %s\n", rbe->msg);
387 rbe_lines = NUM_LINES(rbe->len);
388 if (rbe_lines > bot.lines)
389 return -1;
390 *lines += rbe_lines;
391 if (*lines >= bot.lines)
392 return i;
393 }
394 return RINGBUFFER_SIZE - 1;
395 }
396
397 /*
398 returns number of first visible rbe, *lines is the number of lines drawn.
399 */
400 static int draw_top_rbe(unsigned *lines)
401 {
402 int ret, fvr = first_visible_rbe(lines);
403 struct rb_entry *rbe;
404 size_t bytes_to_skip, cells_to_skip, width;
405
406 if (fvr < 0)
407 return -1;
408 wmove(bot.win, 0, 0);
409 rbe = ringbuffer_get(bot_win_rb, fvr);
410 if (!rbe)
411 return -1;
412 if (*lines > bot.lines) {
413 /* rbe is partially visible multi-line */
414 cells_to_skip = (*lines - bot.lines) * bot.cols;
415 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
416 if (ret < 0)
417 return ret;
418 ret = strwidth(rbe->msg + bytes_to_skip, &width);
419 if (ret < 0)
420 return ret;
421 } else {
422 bytes_to_skip = 0;
423 width = rbe->len;
424 }
425 wattron(bot.win, COLOR_PAIR(rbe->color));
426 waddstr(bot.win, rbe->msg + bytes_to_skip);
427 *lines = NUM_LINES(width);
428 return fvr;
429 }
430
431 static void redraw_bot_win(void)
432 {
433 unsigned lines;
434 int i;
435
436 wmove(bot.win, 0, 0);
437 wclear(bot.win);
438 i = draw_top_rbe(&lines);
439 if (i <= 0)
440 goto out;
441 while (i > 0 && lines < bot.lines) {
442 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
443 if (!rbe) {
444 lines++;
445 waddstr(bot.win, "\n");
446 continue;
447 }
448 lines += NUM_LINES(rbe->len);
449 wattron(bot.win, COLOR_PAIR(rbe->color));
450 waddstr(bot.win, "\n");
451 waddstr(bot.win, rbe->msg);
452 }
453 out:
454 wrefresh(bot.win);
455 }
456
457 static void rb_add_entry(int color, char *msg)
458 {
459 struct rb_entry *old, *new;
460 int x, y;
461 size_t len;
462
463 if (strwidth(msg, &len) < 0)
464 return;
465 new = para_malloc(sizeof(struct rb_entry));
466 new->color = color;
467 new->len = len;
468 new->msg = msg;
469 old = ringbuffer_add(bot_win_rb, new);
470 // fprintf(stderr, "added: %s\n", new->msg);
471 if (old) {
472 free(old->msg);
473 free(old);
474 }
475 if (scroll_position) {
476 /* discard current scrolling, like xterm does */
477 scroll_position = 0;
478 redraw_bot_win();
479 return;
480 }
481 wattron(bot.win, COLOR_PAIR(color));
482 getyx(bot.win, y, x);
483 if (y || x)
484 waddstr(bot.win, "\n");
485 waddstr(bot.win, msg);
486 }
487
488 /*
489 * print formated output to bot win and refresh
490 */
491 __printf_2_3 static void outputf(int color, const char* fmt,...)
492 {
493 char *msg;
494 va_list ap;
495
496 if (!curses_active)
497 return;
498 va_start(ap, fmt);
499 xvasprintf(&msg, fmt, ap);
500 va_end(ap);
501 rb_add_entry(color, msg);
502 wrefresh(bot.win);
503 }
504
505 static int add_output_line(char *line, void *data)
506 {
507 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
508
509 if (!curses_active)
510 return 1;
511 rb_add_entry(color, para_strdup(line));
512 return 1;
513 }
514
515 static int loglevel;
516
517 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
518 {
519 int color;
520 char *msg;
521 va_list ap;
522
523 if (ll < loglevel || !curses_active)
524 return;
525 switch (ll) {
526 case LL_DEBUG:
527 case LL_INFO:
528 case LL_NOTICE:
529 color = COLOR_MSG;
530 break;
531 default:
532 color = COLOR_ERRMSG;
533 }
534 va_start(ap, fmt);
535 xvasprintf(&msg, fmt, ap);
536 va_end(ap);
537 chop(msg);
538 rb_add_entry(color, msg);
539 wrefresh(bot.win);
540 }
541 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
542
543 static void setup_signal_handling(void)
544 {
545 signal_pipe = para_signal_init();
546 para_install_sighandler(SIGINT);
547 para_install_sighandler(SIGTERM);
548 para_install_sighandler(SIGCHLD);
549 para_install_sighandler(SIGWINCH);
550 para_install_sighandler(SIGUSR1);
551 }
552
553 /* kill every process in the process group and exit */
554 __noreturn static void kill_pg_and_die(int ret)
555 {
556 para_sigaction(SIGTERM, SIG_IGN);
557 kill(0, SIGTERM);
558 exit(ret);
559 }
560
561 static void shutdown_curses(void)
562 {
563 if (!curses_active)
564 return;
565 def_prog_mode();
566 curses_active = false;
567 endwin();
568 }
569
570 __noreturn static void finish(int ret)
571 {
572 shutdown_curses();
573 kill_pg_and_die(ret);
574 }
575
576 /*
577 * exit curses and print given message to stdout/stderr
578 */
579 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
580 {
581 va_list argp;
582 FILE *outfd = ret? stderr: stdout;
583
584 shutdown_curses();
585 va_start(argp, fmt);
586 vfprintf(outfd, fmt, argp);
587 va_end(argp);
588 kill_pg_and_die(ret);
589 }
590
591 /*
592 * init all windows
593 */
594 static void init_wins(int top_lines)
595 {
596 int i;
597
598 top.lines = top_lines;
599 top.cols = COLS;
600 top.begy = 0;
601 top.begx = 0;
602
603 bot.lines = LINES - top.lines - 3;
604 bot.cols = COLS;
605 bot.begy = top.lines + 1;
606 bot.begx = 0;
607
608 sb.lines = 1;
609 sb.cols = COLS;
610 sb.begy = LINES - 2;
611 sb.begx = 0;
612
613 in.lines = 1;
614 in.cols = COLS;
615 in.begy = LINES - 1;
616 in.begx = 0;
617
618 sep.lines = 1;
619 sep.cols = COLS;
620 sep.begy = top.lines;
621 sep.begx = 0;
622
623 assume_default_colors(theme.default_fg, theme.default_bg);
624 if (top.win) {
625 mvwin(top.win, top.begy, top.begx);
626 wresize(top.win, top.lines, top.cols);
627
628 mvwin(sb.win, sb.begy, sb.begx);
629 wresize(sb.win, sb.lines, sb.cols);
630
631 mvwin(sep.win, sep.begy, sep.begx);
632 wresize(sep.win, sep.lines, sep.cols);
633
634 mvwin(bot.win, bot.begy, bot.begx);
635 wresize(bot.win, bot.lines, bot.cols);
636
637 mvwin(in.win, in.begy, in.begx);
638 wresize(in.win, in.lines, in.cols);
639 } else {
640 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
641 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
642 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
643 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
644 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
645 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
646 msg_n_exit(1, "Error: Cannot create curses windows\n");
647 wclear(bot.win);
648 wclear(sb.win);
649 wclear(in.win);
650 scrollok(bot.win, 1);
651 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
652 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
653 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
654 wattron(top.win, COLOR_PAIR(COLOR_TOP));
655 nodelay(top.win, 1);
656 nodelay(bot.win, 1);
657 nodelay(sb.win, 1);
658 nodelay(in.win, 0);
659
660 keypad(top.win, 1);
661 keypad(bot.win, 1);
662 keypad(sb.win, 1);
663 keypad(in.win, 1);
664 }
665 wmove(sep.win, 0, 0);
666 for (i = 1; i <= COLS; i++)
667 waddstr(sep.win, theme.sep_str);
668 wclear(top.win);
669 //wclear(bot.win);
670 wnoutrefresh(top.win);
671 wnoutrefresh(bot.win);
672 print_status_bar();
673 wnoutrefresh(sb.win);
674 wnoutrefresh(in.win);
675 wnoutrefresh(sep.win);
676 doupdate();
677 }
678
679 /*
680 * Print stat item #i to curses window
681 */
682 static void print_stat_item(int i)
683 {
684 char *tmp;
685 struct stat_item_data d = theme.data[i];
686 char *c = stat_content[i];
687
688 if (!curses_active || !d.len || !c)
689 return;
690 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
691 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
692 wrefresh(top.win);
693 wattron(top.win, COLOR_PAIR(i + 1));
694 align_str(top.win, tmp, d.len * COLS / 100, d.align);
695 free(tmp);
696 wrefresh(top.win);
697 }
698
699 static int update_item(int item_num, char *buf)
700 {
701 char **c = stat_content + item_num;
702
703 free(*c);
704 if (buf && buf[0])
705 goto dup;
706 switch (item_num) {
707 case SI_ARTIST:
708 *c = para_strdup("(artist tag not set)");
709 goto print;
710 case SI_TITLE:
711 *c = para_strdup("(title tag not set)");
712 goto print;
713 case SI_YEAR:
714 *c = para_strdup("????");
715 goto print;
716 case SI_ALBUM:
717 *c = para_strdup("(album tag not set)");
718 goto print;
719 case SI_COMMENT:
720 *c = para_strdup("(comment tag not set)");
721 goto print;
722 }
723 dup:
724 *c = para_strdup(buf);
725 print:
726 print_stat_item(item_num);
727 return 1;
728 }
729
730 static int read_stat_pipe(fd_set *rfds)
731 {
732 static char *buf;
733 static int bufsize, loaded;
734 int ret, ret2;
735 size_t sz;
736
737 if (stat_pipe < 0)
738 return 0;
739 if (loaded >= bufsize) {
740 if (bufsize > 1000 * 1000) {
741 loaded = 0;
742 return 0;
743 }
744 bufsize += bufsize + 1000;
745 buf = para_realloc(buf, bufsize);
746 }
747 assert(loaded < bufsize);
748 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
749 rfds, &sz);
750 loaded += sz;
751 ret2 = for_each_stat_item(buf, loaded, update_item);
752 if (ret < 0 || ret2 < 0) {
753 loaded = 0;
754 return ret2 < 0? ret2 : ret;
755 }
756 sz = ret2; /* what is left */
757 if (sz > 0 && sz < loaded)
758 memmove(buf, buf + loaded - sz, sz);
759 loaded = sz;
760 return 1;
761 }
762
763 static void print_all_items(void)
764 {
765 int i;
766
767 if (!curses_active)
768 return;
769 FOR_EACH_STATUS_ITEM(i)
770 print_stat_item(i);
771 }
772
773 static void clear_all_items(void)
774 {
775 int i;
776
777 FOR_EACH_STATUS_ITEM(i) {
778 free(stat_content[i]);
779 stat_content[i] = para_strdup("");
780 }
781 }
782
783 static void init_pair_or_die(short pair, short f, short b)
784 {
785 if (init_pair(pair, f, b) == ERR)
786 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
787 }
788
789 static void init_colors_or_die(void)
790 {
791 int i;
792
793 if (!has_colors())
794 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
795 if (start_color() == ERR)
796 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
797 FOR_EACH_STATUS_ITEM(i)
798 if (theme.data[i].len)
799 init_pair_or_die(i + 1, theme.data[i].fg,
800 theme.data[i].bg);
801 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
802 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
803 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
804 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
805 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
806 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
807 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
808 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
809 }
810
811 /* (Re-)initialize the curses library. */
812 static void init_curses(void)
813 {
814 curses_active = true;
815 if (top.win && refresh() == ERR) /* refresh is really needed */
816 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
817 if (LINES < theme.lines_min || COLS < theme.cols_min)
818 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
819 " (need at least %dx%d)\n", COLS, LINES,
820 theme.cols_min, theme.lines_min);
821 curs_set(0); /* make cursor invisible, ignore errors */
822 nonl(); /* do not NL->CR/NL on output, always returns OK */
823 /* don't echo input */
824 if (noecho() == ERR)
825 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
826 /* take input chars one at a time, no wait for \n */
827 if (cbreak() == ERR)
828 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
829 init_colors_or_die();
830 clear(); /* ignore non-fatal errors */
831 init_wins(theme.top_lines_default);
832 print_all_items();
833 // noecho(); /* don't echo input */
834 }
835
836 static void check_sigchld(void)
837 {
838 int ret;
839 pid_t pid;
840
841 reap_next_child:
842 ret = para_reap_child(&pid);
843 if (ret <= 0)
844 return;
845 if (pid == cmd_pid)
846 cmd_pid = 0;
847 goto reap_next_child;
848 }
849
850 /*
851 * This sucker modifies its first argument. *handler and *arg are
852 * pointers to 0-terminated strings (inside line). Crap.
853 */
854 static int split_key_map(char *line, char **handler, char **arg)
855 {
856 if (!(*handler = strchr(line + 1, ':')))
857 goto err_out;
858 **handler = '\0';
859 (*handler)++;
860 if (!(*arg = strchr(*handler, ':')))
861 goto err_out;
862 **arg = '\0';
863 (*arg)++;
864 return 1;
865 err_out:
866 return 0;
867 }
868
869 static int check_key_map_args(void)
870 {
871 char *s;
872 int i, ret = -1;
873 char *tmp = NULL, *handler, *arg;
874
875 for (i = 0; i < conf.key_map_given; ++i) {
876 s = conf.key_map_arg[i];
877 if (!(*s))
878 goto out;
879 free(tmp);
880 tmp = para_strdup(s);
881 if (!split_key_map(tmp, &handler, &arg))
882 goto out;
883 if (strlen(handler) != 1)
884 goto out;
885 if (*handler != 'x'
886 && *handler != 'd'
887 && *handler != 'i'
888 && *handler != 'p')
889 goto out;
890 if (*handler != 'i')
891 continue;
892 if (find_cmd_byname(arg) < 0)
893 goto out;
894 }
895 ret = 0;
896 out:
897 free(tmp);
898 return ret;
899 }
900
901 /*
902 * React to various signal-related events
903 */
904 static void handle_signal(int sig)
905 {
906 switch (sig) {
907 case SIGTERM:
908 msg_n_exit(EXIT_FAILURE,
909 "only the good die young (caught SIGTERM))\n");
910 return;
911 case SIGWINCH:
912 if (curses_active) {
913 shutdown_curses();
914 init_curses();
915 redraw_bot_win();
916 }
917 return;
918 case SIGINT:
919 PARA_WARNING_LOG("caught SIGINT, reset\n");
920 /* Nothing to do. SIGINT killed our child which gets noticed
921 * by do_select and resets everything.
922 */
923 return;
924 case SIGUSR1:
925 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
926 com_reread_conf();
927 return;
928 case SIGCHLD:
929 check_sigchld();
930 return;
931 }
932 }
933
934 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
935 {
936 static struct timeval next_exec, atm, diff;
937 int ret, fds[3] = {0, 1, 0};
938 pid_t pid;
939
940 if (stat_pipe >= 0)
941 goto success;
942 /* Avoid busy loop */
943 gettimeofday(&atm, NULL);
944 if (tv_diff(&next_exec, &atm, &diff) > 0) {
945 if (tv_diff(&diff, tv, NULL) < 0)
946 *tv = diff;
947 return;
948 }
949 next_exec.tv_sec = atm.tv_sec + 2;
950 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
951 if (ret < 0)
952 return;
953 ret = mark_fd_nonblocking(fds[1]);
954 if (ret < 0) {
955 close(fds[1]);
956 return;
957 }
958 stat_pipe = fds[1];
959 success:
960 para_fd_set(stat_pipe, rfds, max_fileno);
961 }
962
963 #define COMMAND_BUF_SIZE 32768
964
965 /*
966 * This is the core select loop. Besides the (internal) signal
967 * pipe, the following other fds are checked according to the mode:
968 *
969 * GETCH_MODE: check stdin, return when key is pressed
970 *
971 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
972 * stdout and stderr or when any key is pressed.
973 *
974 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
975 * is running. During that time curses is disabled. Returns when
976 * cmd_pid == 0.
977 */
978 static int do_select(int mode)
979 {
980 fd_set rfds;
981 int ret, i, max_fileno;
982 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
983 int cbo[2] = {0, 0}; /* command buf offsets */
984 struct timeval tv;
985 unsigned flags[2] = {0, 0}; /* for for_each_line() */
986
987 repeat:
988 tv.tv_sec = conf.timeout_arg / 1000;
989 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
990 // ret = refresh_status();
991 FD_ZERO(&rfds);
992 max_fileno = 0;
993 status_pre_select(&rfds, &max_fileno, &tv);
994 /* signal pipe */
995 para_fd_set(signal_pipe, &rfds, &max_fileno);
996 /* command pipe only for COMMAND_MODE */
997 if (mode == COMMAND_MODE) {
998 if (command_fds[0] >= 0)
999 para_fd_set(command_fds[0], &rfds, &max_fileno);
1000 if (command_fds[1] >= 0)
1001 para_fd_set(command_fds[1], &rfds, &max_fileno);
1002 }
1003 if (mode == GETCH_MODE || mode == COMMAND_MODE)
1004 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1005 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1006 if (ret <= 0)
1007 goto check_return; /* skip fd checks */
1008 /* signals */
1009 ret = para_next_signal(&rfds);
1010 if (ret > 0)
1011 handle_signal(ret);
1012 /* read command pipe if ready */
1013 if (mode == COMMAND_MODE) {
1014 for (i = 0; i < 2; i++) {
1015 size_t sz;
1016 if (command_fds[i] < 0)
1017 continue;
1018 ret = read_nonblock(command_fds[i],
1019 command_buf[i] + cbo[i],
1020 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1021 cbo[i] += sz;
1022 sz = cbo[i];
1023 cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1024 add_output_line, &i);
1025 if (sz != cbo[i]) { /* at least one line found */
1026 wrefresh(bot.win);
1027 flags[i] = 0;
1028 }
1029 if (ret < 0) {
1030 PARA_NOTICE_LOG("closing command fd %d: %s\n",
1031 i, para_strerror(-ret));
1032 close(command_fds[i]);
1033 command_fds[i] = -1;
1034 flags[i] = 0;
1035 cbo[i] = 0;
1036 if (command_fds[!i] < 0) /* both fds closed */
1037 return 0;
1038 }
1039 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1040 PARA_NOTICE_LOG("discarding overlong line\n");
1041 cbo[i] = 0;
1042 flags[i] = FELF_DISCARD_FIRST;
1043 }
1044 }
1045 }
1046 ret = read_stat_pipe(&rfds);
1047 if (ret < 0) {
1048 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1049 close(stat_pipe);
1050 stat_pipe = -1;
1051 clear_all_items();
1052 free(stat_content[SI_BASENAME]);
1053 stat_content[SI_BASENAME] =
1054 para_strdup("stat command terminated!?");
1055 print_all_items();
1056 }
1057 check_return:
1058 switch (mode) {
1059 case COMMAND_MODE:
1060 ret = wgetch(top.win);
1061 if (ret != ERR && ret != KEY_RESIZE) {
1062 if (cmd_pid)
1063 kill(cmd_pid, SIGTERM);
1064 return -1;
1065 }
1066 break;
1067 case GETCH_MODE:
1068 ret = wgetch(top.win);
1069 if (ret != ERR && ret != KEY_RESIZE)
1070 return ret;
1071 break;
1072 case EXTERNAL_MODE:
1073 if (cmd_pid == 0)
1074 return 0;
1075 }
1076 goto repeat;
1077 }
1078
1079 /* read from command pipe and print data to bot window */
1080 static void exec_and_display_cmd(const char *cmd)
1081 {
1082 int ret, fds[3] = {0, 1, 1};
1083
1084 outputf(COLOR_COMMAND, "%s", cmd);
1085 ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1086 if (ret < 0)
1087 return;
1088 ret = mark_fd_nonblocking(fds[1]);
1089 if (ret < 0)
1090 goto fail;
1091 ret = mark_fd_nonblocking(fds[2]);
1092 if (ret < 0)
1093 goto fail;
1094 command_fds[0] = fds[1];
1095 command_fds[1] = fds[2];
1096 if (do_select(COMMAND_MODE) >= 0)
1097 PARA_INFO_LOG("command complete\n");
1098 else
1099 PARA_NOTICE_LOG("command aborted\n");
1100 print_in_bar(COLOR_MSG, " ");
1101 return;
1102 fail:
1103 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1104 close(command_fds[0]);
1105 close(command_fds[1]);
1106 }
1107
1108 static void para_cmd(char *cmd)
1109 {
1110 char *c;
1111
1112 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1113 c = make_message(BINDIR "/para_client -- %s", cmd);
1114 exec_and_display_cmd(c);
1115 free(c);
1116 }
1117
1118 static void display_cmd(char *cmd)
1119 {
1120 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1121 exec_and_display_cmd(cmd);
1122 }
1123
1124 /*
1125 * shutdown curses and stat pipe before executing external commands
1126 */
1127 static void external_cmd(char *cmd)
1128 {
1129 int fds[3] = {-1, -1, -1};
1130
1131 if (cmd_pid)
1132 return;
1133 shutdown_curses();
1134 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1135 return;
1136 do_select(EXTERNAL_MODE);
1137 init_curses();
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;
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_scrolling(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;
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);
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;
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 wrefresh(bot.win);
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 // fprintf(stderr, "msg: %s\n", rbe->msg);
1270 wattron(bot.win, COLOR_PAIR(rbe->color));
1271 waddstr(bot.win, "\n");
1272 waddstr(bot.win, rbe->msg);
1273 if (!i)
1274 break;
1275 i--;
1276 }
1277 wrefresh(bot.win);
1278 print_scroll_msg();
1279 return;
1280 err_out:
1281 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1282 }
1283
1284 static void com_ll_decr(void)
1285 {
1286 if (loglevel <= LL_DEBUG) {
1287 print_in_bar(COLOR_ERRMSG,
1288 "loglevel already at maximal verbosity\n");
1289 return;
1290 }
1291 loglevel--;
1292 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1293 }
1294
1295 static void com_ll_incr(void)
1296 {
1297 if (loglevel >= LL_EMERG) {
1298 print_in_bar(COLOR_ERRMSG,
1299 "loglevel already at minimal verbosity\n");
1300 return;
1301 }
1302 loglevel++;
1303 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1304 }
1305
1306 /*
1307 * reread configuration, terminate on errors
1308 */
1309 static void com_reread_conf(void)
1310 {
1311 char *cf = configfile_exists();
1312 struct gui_cmdline_parser_params params = {
1313 .override = 1,
1314 .initialize = 1,
1315 .check_required = 0,
1316 .check_ambiguity = 0,
1317 .print_errors = 0,
1318 };
1319
1320 if (!cf) {
1321 PARA_WARNING_LOG("there is no configuration to read\n");
1322 return;
1323 }
1324 PARA_INFO_LOG("rereading command line options and config file\n");
1325 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1326 /*
1327 * Despite .print_errors is set to 0, gengetopt will print to stderr
1328 * anyway, and exit on errors. So we have to shutdown curses first.
1329 */
1330 shutdown_curses();
1331 gui_cmdline_parser_config_file(cf, &conf, &params);
1332 init_curses();
1333 PARA_NOTICE_LOG("config file reloaded\n");
1334 if (check_key_map_args() < 0)
1335 finish(EXIT_FAILURE);
1336 }
1337
1338 static void com_help(void)
1339 {
1340 int i;
1341
1342 for (i = 0; i < conf.key_map_given; ++i) {
1343 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1344 const char *handler_text = "???", *desc = NULL;
1345
1346 if (!split_key_map(tmp, &handler, &arg)) {
1347 free(tmp);
1348 return;
1349 }
1350 switch (*handler) {
1351 case 'i':
1352 handler_text = "internal";
1353 desc = command_list[find_cmd_byname(arg)].description;
1354 break;
1355 case 'x': handler_text = "external"; break;
1356 case 'd': handler_text = "display "; break;
1357 case 'p': handler_text = "para "; break;
1358 }
1359 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1360 strlen(arg) < 8? "\t" : "",
1361 desc? desc : "");
1362 free(tmp);
1363 }
1364 for (i = 0; command_list[i].handler; i++) {
1365 struct gui_command gc = command_list[i];
1366
1367 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1368 strlen(gc.name) < 8? "\t" : "",
1369 gc.description);
1370 }
1371 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1372 "for more info");
1373 }
1374
1375 static void com_shrink_top_win(void)
1376 {
1377 if (top.lines <= theme.top_lines_min) {
1378 PARA_WARNING_LOG("can not decrease top window\n");
1379 return;
1380 }
1381 init_wins(top.lines - 1);
1382 wclear(top.win);
1383 print_all_items();
1384 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1385 }
1386
1387 static void com_enlarge_top_win(void)
1388 {
1389 if (bot.lines < 3) {
1390 PARA_WARNING_LOG("can not increase top window\n");
1391 return;
1392 }
1393 init_wins(top.lines + 1);
1394 wclear(top.win);
1395 print_all_items();
1396 print_in_bar(COLOR_MSG, "increased top window");
1397 }
1398
1399 static void com_version(void)
1400 {
1401 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1402 }
1403
1404 __noreturn static void com_quit(void)
1405 {
1406 finish(0);
1407 }
1408
1409 static void com_refresh(void)
1410 {
1411 shutdown_curses();
1412 init_curses();
1413 }
1414
1415 static void change_theme(int next)
1416 {
1417 if (next)
1418 next_theme(&theme);
1419 else
1420 prev_theme(&theme);
1421 /* This seems to be needed twice, why? */
1422 com_refresh();
1423 com_refresh();
1424 PARA_NOTICE_LOG("new theme: %s\n", theme.name);
1425 }
1426
1427 static void com_next_theme(void)
1428 {
1429 change_theme(1);
1430 }
1431
1432 static void com_prev_theme(void)
1433 {
1434 change_theme(0);
1435 }
1436
1437
1438 static void handle_command(int c)
1439 {
1440 int i;
1441
1442 /* first check user-defined key bindings */
1443 for (i = 0; i < conf.key_map_given; ++i) {
1444 char *tmp, *handler, *arg;
1445
1446 tmp = para_strdup(conf.key_map_arg[i]);
1447 if (!split_key_map(tmp, &handler, &arg)) {
1448 free(tmp);
1449 return;
1450 }
1451 if (strcmp(tmp, km_keyname(c))) {
1452 free(tmp);
1453 continue;
1454 }
1455 if (*handler == 'd')
1456 display_cmd(arg);
1457 else if (*handler == 'x')
1458 external_cmd(arg);
1459 else if (*handler == 'p')
1460 para_cmd(arg);
1461 else if (*handler == 'i') {
1462 int num = find_cmd_byname(arg);
1463 if (num >= 0)
1464 command_list[num].handler();
1465 }
1466 free(tmp);
1467 return;
1468 }
1469 /* not found, check internal key bindings */
1470 for (i = 0; command_list[i].handler; i++) {
1471 if (!strcmp(km_keyname(c), command_list[i].key)) {
1472 command_list[i].handler();
1473 return;
1474 }
1475 }
1476 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1477 km_keyname(c));
1478 }
1479
1480 __noreturn static void print_help_and_die(void)
1481 {
1482 struct ggo_help h = DEFINE_GGO_HELP(gui);
1483 bool d = conf.detailed_help_given;
1484
1485 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1486 exit(0);
1487 }
1488
1489 int main(int argc, char *argv[])
1490 {
1491 int ret;
1492 char *cf;
1493
1494 _argc = argc;
1495 _argv = argv;
1496
1497 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1498 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1499 version_handle_flag("gui", conf.version_given);
1500 if (conf.help_given || conf.detailed_help_given)
1501 print_help_and_die();
1502 cf = configfile_exists();
1503 if (!cf && conf.config_file_given) {
1504 fprintf(stderr, "can not read config file %s\n",
1505 conf.config_file_arg);
1506 exit(EXIT_FAILURE);
1507 }
1508 if (cf) {
1509 struct gui_cmdline_parser_params params = {
1510 .override = 0,
1511 .initialize = 0,
1512 .check_required = 0,
1513 .check_ambiguity = 0,
1514 .print_errors = 1,
1515 };
1516 gui_cmdline_parser_config_file(cf, &conf, &params);
1517 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1518 }
1519 if (check_key_map_args() < 0) {
1520 fprintf(stderr, "invalid key map\n");
1521 exit(EXIT_FAILURE);
1522 }
1523 init_theme_or_die(conf.theme_arg, &theme);
1524 setup_signal_handling();
1525 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1526 setlocale(LC_CTYPE, "");
1527 initscr(); /* needed only once, always successful */
1528 init_curses();
1529 for (;;) {
1530 print_status_bar();
1531 ret = do_select(GETCH_MODE);
1532 if (!ret)
1533 continue;
1534 print_in_bar(COLOR_MSG, " ");
1535 handle_command(ret);
1536 }
1537 }