gui: Use whline() for drawing the separator.
[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 top.lines = top_lines;
597 top.cols = COLS;
598 top.begy = 0;
599 top.begx = 0;
600
601 bot.lines = LINES - top.lines - 3;
602 bot.cols = COLS;
603 bot.begy = top.lines + 1;
604 bot.begx = 0;
605
606 sb.lines = 1;
607 sb.cols = COLS;
608 sb.begy = LINES - 2;
609 sb.begx = 0;
610
611 in.lines = 1;
612 in.cols = COLS;
613 in.begy = LINES - 1;
614 in.begx = 0;
615
616 sep.lines = 1;
617 sep.cols = COLS;
618 sep.begy = top.lines;
619 sep.begx = 0;
620
621 assume_default_colors(theme.default_fg, theme.default_bg);
622 if (top.win) {
623 mvwin(top.win, top.begy, top.begx);
624 wresize(top.win, top.lines, top.cols);
625
626 mvwin(sb.win, sb.begy, sb.begx);
627 wresize(sb.win, sb.lines, sb.cols);
628
629 mvwin(sep.win, sep.begy, sep.begx);
630 wresize(sep.win, sep.lines, sep.cols);
631
632 mvwin(bot.win, bot.begy, bot.begx);
633 wresize(bot.win, bot.lines, bot.cols);
634
635 mvwin(in.win, in.begy, in.begx);
636 wresize(in.win, in.lines, in.cols);
637 } else {
638 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
639 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
640 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
641 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
642 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
643 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
644 msg_n_exit(1, "Error: Cannot create curses windows\n");
645 wclear(bot.win);
646 wclear(sb.win);
647 wclear(in.win);
648 scrollok(bot.win, 1);
649 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
650 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
651 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
652 wattron(top.win, COLOR_PAIR(COLOR_TOP));
653 nodelay(top.win, 1);
654 nodelay(bot.win, 1);
655 nodelay(sb.win, 1);
656 nodelay(in.win, 0);
657
658 keypad(top.win, 1);
659 keypad(bot.win, 1);
660 keypad(sb.win, 1);
661 keypad(in.win, 1);
662 }
663 wmove(sep.win, 0, 0);
664 whline(sep.win, theme.sep_char, COLS);
665 wclear(top.win);
666 //wclear(bot.win);
667 wnoutrefresh(top.win);
668 wnoutrefresh(bot.win);
669 print_status_bar();
670 wnoutrefresh(sb.win);
671 wnoutrefresh(in.win);
672 wnoutrefresh(sep.win);
673 doupdate();
674 }
675
676 /*
677 * Print stat item #i to curses window
678 */
679 static void print_stat_item(int i)
680 {
681 char *tmp;
682 struct stat_item_data d = theme.data[i];
683 char *c = stat_content[i];
684
685 if (!curses_active || !d.len || !c)
686 return;
687 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
688 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
689 wrefresh(top.win);
690 wattron(top.win, COLOR_PAIR(i + 1));
691 align_str(top.win, tmp, d.len * COLS / 100, d.align);
692 free(tmp);
693 wrefresh(top.win);
694 }
695
696 static int update_item(int item_num, char *buf)
697 {
698 char **c = stat_content + item_num;
699
700 free(*c);
701 if (buf && buf[0])
702 goto dup;
703 switch (item_num) {
704 case SI_ARTIST:
705 *c = para_strdup("(artist tag not set)");
706 goto print;
707 case SI_TITLE:
708 *c = para_strdup("(title tag not set)");
709 goto print;
710 case SI_YEAR:
711 *c = para_strdup("????");
712 goto print;
713 case SI_ALBUM:
714 *c = para_strdup("(album tag not set)");
715 goto print;
716 case SI_COMMENT:
717 *c = para_strdup("(comment tag not set)");
718 goto print;
719 }
720 dup:
721 *c = para_strdup(buf);
722 print:
723 print_stat_item(item_num);
724 return 1;
725 }
726
727 static int read_stat_pipe(fd_set *rfds)
728 {
729 static char *buf;
730 static int bufsize, loaded;
731 int ret, ret2;
732 size_t sz;
733
734 if (stat_pipe < 0)
735 return 0;
736 if (loaded >= bufsize) {
737 if (bufsize > 1000 * 1000) {
738 loaded = 0;
739 return 0;
740 }
741 bufsize += bufsize + 1000;
742 buf = para_realloc(buf, bufsize);
743 }
744 assert(loaded < bufsize);
745 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
746 rfds, &sz);
747 loaded += sz;
748 ret2 = for_each_stat_item(buf, loaded, update_item);
749 if (ret < 0 || ret2 < 0) {
750 loaded = 0;
751 return ret2 < 0? ret2 : ret;
752 }
753 sz = ret2; /* what is left */
754 if (sz > 0 && sz < loaded)
755 memmove(buf, buf + loaded - sz, sz);
756 loaded = sz;
757 return 1;
758 }
759
760 static void print_all_items(void)
761 {
762 int i;
763
764 if (!curses_active)
765 return;
766 FOR_EACH_STATUS_ITEM(i)
767 print_stat_item(i);
768 }
769
770 static void clear_all_items(void)
771 {
772 int i;
773
774 FOR_EACH_STATUS_ITEM(i) {
775 free(stat_content[i]);
776 stat_content[i] = para_strdup("");
777 }
778 }
779
780 static void init_pair_or_die(short pair, short f, short b)
781 {
782 if (init_pair(pair, f, b) == ERR)
783 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
784 }
785
786 static void init_colors_or_die(void)
787 {
788 int i;
789
790 if (!has_colors())
791 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
792 if (start_color() == ERR)
793 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
794 FOR_EACH_STATUS_ITEM(i)
795 if (theme.data[i].len)
796 init_pair_or_die(i + 1, theme.data[i].fg,
797 theme.data[i].bg);
798 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
799 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
800 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
801 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
802 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
803 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
804 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
805 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
806 }
807
808 /* (Re-)initialize the curses library. */
809 static void init_curses(void)
810 {
811 curses_active = true;
812 if (top.win && refresh() == ERR) /* refresh is really needed */
813 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
814 if (LINES < theme.lines_min || COLS < theme.cols_min)
815 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
816 " (need at least %dx%d)\n", COLS, LINES,
817 theme.cols_min, theme.lines_min);
818 curs_set(0); /* make cursor invisible, ignore errors */
819 nonl(); /* do not NL->CR/NL on output, always returns OK */
820 /* don't echo input */
821 if (noecho() == ERR)
822 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
823 /* take input chars one at a time, no wait for \n */
824 if (cbreak() == ERR)
825 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
826 init_colors_or_die();
827 clear(); /* ignore non-fatal errors */
828 init_wins(theme.top_lines_default);
829 print_all_items();
830 // noecho(); /* don't echo input */
831 }
832
833 static void check_sigchld(void)
834 {
835 int ret;
836 pid_t pid;
837
838 reap_next_child:
839 ret = para_reap_child(&pid);
840 if (ret <= 0)
841 return;
842 if (pid == cmd_pid)
843 cmd_pid = 0;
844 goto reap_next_child;
845 }
846
847 /*
848 * This sucker modifies its first argument. *handler and *arg are
849 * pointers to 0-terminated strings (inside line). Crap.
850 */
851 static int split_key_map(char *line, char **handler, char **arg)
852 {
853 if (!(*handler = strchr(line + 1, ':')))
854 goto err_out;
855 **handler = '\0';
856 (*handler)++;
857 if (!(*arg = strchr(*handler, ':')))
858 goto err_out;
859 **arg = '\0';
860 (*arg)++;
861 return 1;
862 err_out:
863 return 0;
864 }
865
866 static int check_key_map_args(void)
867 {
868 char *s;
869 int i, ret = -1;
870 char *tmp = NULL, *handler, *arg;
871
872 for (i = 0; i < conf.key_map_given; ++i) {
873 s = conf.key_map_arg[i];
874 if (!(*s))
875 goto out;
876 free(tmp);
877 tmp = para_strdup(s);
878 if (!split_key_map(tmp, &handler, &arg))
879 goto out;
880 if (strlen(handler) != 1)
881 goto out;
882 if (*handler != 'x'
883 && *handler != 'd'
884 && *handler != 'i'
885 && *handler != 'p')
886 goto out;
887 if (*handler != 'i')
888 continue;
889 if (find_cmd_byname(arg) < 0)
890 goto out;
891 }
892 ret = 0;
893 out:
894 free(tmp);
895 return ret;
896 }
897
898 /*
899 * React to various signal-related events
900 */
901 static void handle_signal(int sig)
902 {
903 switch (sig) {
904 case SIGTERM:
905 msg_n_exit(EXIT_FAILURE,
906 "only the good die young (caught SIGTERM))\n");
907 return;
908 case SIGWINCH:
909 if (curses_active) {
910 shutdown_curses();
911 init_curses();
912 redraw_bot_win();
913 }
914 return;
915 case SIGINT:
916 PARA_WARNING_LOG("caught SIGINT, reset\n");
917 /* Nothing to do. SIGINT killed our child which gets noticed
918 * by do_select and resets everything.
919 */
920 return;
921 case SIGUSR1:
922 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
923 com_reread_conf();
924 return;
925 case SIGCHLD:
926 check_sigchld();
927 return;
928 }
929 }
930
931 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
932 {
933 static struct timeval next_exec, atm, diff;
934 int ret, fds[3] = {0, 1, 0};
935 pid_t pid;
936
937 if (stat_pipe >= 0)
938 goto success;
939 /* Avoid busy loop */
940 gettimeofday(&atm, NULL);
941 if (tv_diff(&next_exec, &atm, &diff) > 0) {
942 if (tv_diff(&diff, tv, NULL) < 0)
943 *tv = diff;
944 return;
945 }
946 next_exec.tv_sec = atm.tv_sec + 2;
947 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
948 if (ret < 0)
949 return;
950 ret = mark_fd_nonblocking(fds[1]);
951 if (ret < 0) {
952 close(fds[1]);
953 return;
954 }
955 stat_pipe = fds[1];
956 success:
957 para_fd_set(stat_pipe, rfds, max_fileno);
958 }
959
960 #define COMMAND_BUF_SIZE 32768
961
962 /*
963 * This is the core select loop. Besides the (internal) signal
964 * pipe, the following other fds are checked according to the mode:
965 *
966 * GETCH_MODE: check stdin, return when key is pressed
967 *
968 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
969 * stdout and stderr or when any key is pressed.
970 *
971 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
972 * is running. During that time curses is disabled. Returns when
973 * cmd_pid == 0.
974 */
975 static int do_select(int mode)
976 {
977 fd_set rfds;
978 int ret, i, max_fileno;
979 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
980 int cbo[2] = {0, 0}; /* command buf offsets */
981 struct timeval tv;
982 unsigned flags[2] = {0, 0}; /* for for_each_line() */
983
984 repeat:
985 tv.tv_sec = conf.timeout_arg / 1000;
986 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
987 // ret = refresh_status();
988 FD_ZERO(&rfds);
989 max_fileno = 0;
990 status_pre_select(&rfds, &max_fileno, &tv);
991 /* signal pipe */
992 para_fd_set(signal_pipe, &rfds, &max_fileno);
993 /* command pipe only for COMMAND_MODE */
994 if (mode == COMMAND_MODE) {
995 if (command_fds[0] >= 0)
996 para_fd_set(command_fds[0], &rfds, &max_fileno);
997 if (command_fds[1] >= 0)
998 para_fd_set(command_fds[1], &rfds, &max_fileno);
999 }
1000 if (mode == GETCH_MODE || mode == COMMAND_MODE)
1001 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1002 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1003 if (ret <= 0)
1004 goto check_return; /* skip fd checks */
1005 /* signals */
1006 ret = para_next_signal(&rfds);
1007 if (ret > 0)
1008 handle_signal(ret);
1009 /* read command pipe if ready */
1010 if (mode == COMMAND_MODE) {
1011 for (i = 0; i < 2; i++) {
1012 size_t sz;
1013 if (command_fds[i] < 0)
1014 continue;
1015 ret = read_nonblock(command_fds[i],
1016 command_buf[i] + cbo[i],
1017 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1018 cbo[i] += sz;
1019 sz = cbo[i];
1020 cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1021 add_output_line, &i);
1022 if (sz != cbo[i]) { /* at least one line found */
1023 wrefresh(bot.win);
1024 flags[i] = 0;
1025 }
1026 if (ret < 0) {
1027 PARA_NOTICE_LOG("closing command fd %d: %s\n",
1028 i, para_strerror(-ret));
1029 close(command_fds[i]);
1030 command_fds[i] = -1;
1031 flags[i] = 0;
1032 cbo[i] = 0;
1033 if (command_fds[!i] < 0) /* both fds closed */
1034 return 0;
1035 }
1036 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1037 PARA_NOTICE_LOG("discarding overlong line\n");
1038 cbo[i] = 0;
1039 flags[i] = FELF_DISCARD_FIRST;
1040 }
1041 }
1042 }
1043 ret = read_stat_pipe(&rfds);
1044 if (ret < 0) {
1045 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1046 close(stat_pipe);
1047 stat_pipe = -1;
1048 clear_all_items();
1049 free(stat_content[SI_BASENAME]);
1050 stat_content[SI_BASENAME] =
1051 para_strdup("stat command terminated!?");
1052 print_all_items();
1053 }
1054 check_return:
1055 switch (mode) {
1056 case COMMAND_MODE:
1057 ret = wgetch(top.win);
1058 if (ret != ERR && ret != KEY_RESIZE) {
1059 if (cmd_pid)
1060 kill(cmd_pid, SIGTERM);
1061 return -1;
1062 }
1063 break;
1064 case GETCH_MODE:
1065 ret = wgetch(top.win);
1066 if (ret != ERR && ret != KEY_RESIZE)
1067 return ret;
1068 break;
1069 case EXTERNAL_MODE:
1070 if (cmd_pid == 0)
1071 return 0;
1072 }
1073 goto repeat;
1074 }
1075
1076 /* read from command pipe and print data to bot window */
1077 static void exec_and_display_cmd(const char *cmd)
1078 {
1079 int ret, fds[3] = {0, 1, 1};
1080
1081 outputf(COLOR_COMMAND, "%s", cmd);
1082 ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1083 if (ret < 0)
1084 return;
1085 ret = mark_fd_nonblocking(fds[1]);
1086 if (ret < 0)
1087 goto fail;
1088 ret = mark_fd_nonblocking(fds[2]);
1089 if (ret < 0)
1090 goto fail;
1091 command_fds[0] = fds[1];
1092 command_fds[1] = fds[2];
1093 if (do_select(COMMAND_MODE) >= 0)
1094 PARA_INFO_LOG("command complete\n");
1095 else
1096 PARA_NOTICE_LOG("command aborted\n");
1097 print_in_bar(COLOR_MSG, " ");
1098 return;
1099 fail:
1100 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1101 close(command_fds[0]);
1102 close(command_fds[1]);
1103 }
1104
1105 static void para_cmd(char *cmd)
1106 {
1107 char *c;
1108
1109 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1110 c = make_message(BINDIR "/para_client -- %s", cmd);
1111 exec_and_display_cmd(c);
1112 free(c);
1113 }
1114
1115 static void display_cmd(char *cmd)
1116 {
1117 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1118 exec_and_display_cmd(cmd);
1119 }
1120
1121 /*
1122 * shutdown curses and stat pipe before executing external commands
1123 */
1124 static void external_cmd(char *cmd)
1125 {
1126 int fds[3] = {-1, -1, -1};
1127
1128 if (cmd_pid)
1129 return;
1130 shutdown_curses();
1131 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1132 return;
1133 do_select(EXTERNAL_MODE);
1134 init_curses();
1135 }
1136
1137 static void print_scroll_msg(void)
1138 {
1139 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1140 int first_rbe = first_visible_rbe(&lines_total);
1141
1142 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1143 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1144 }
1145
1146 static void com_scroll_top(void)
1147 {
1148 int i = RINGBUFFER_SIZE - 1;
1149 unsigned lines = 0;
1150
1151 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1152 i--;
1153 /* i is oldest entry */
1154 for (; lines < bot.lines && i >= 0; i--) {
1155 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1156 if (!rbe)
1157 break;
1158 lines += NUM_LINES(rbe->len);
1159 }
1160 i++;
1161 if (lines > 0 && scroll_position != i) {
1162 scroll_position = i;
1163 redraw_bot_win();
1164 print_scroll_msg();
1165 return;
1166 }
1167 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1168 }
1169
1170 static void com_cancel_scrolling(void)
1171 {
1172
1173 if (scroll_position == 0) {
1174 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1175 return;
1176 }
1177 scroll_position = 0;
1178 redraw_bot_win();
1179 }
1180
1181 static void com_page_down(void)
1182 {
1183 unsigned lines = 0;
1184 int i = scroll_position;
1185
1186 while (lines < bot.lines && --i > 0) {
1187 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1188 if (!rbe)
1189 break;
1190 lines += NUM_LINES(rbe->len);
1191 }
1192 if (lines) {
1193 scroll_position = i;
1194 redraw_bot_win();
1195 print_scroll_msg();
1196 return;
1197 }
1198 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1199 }
1200
1201 static void com_page_up(void)
1202 {
1203 unsigned lines;
1204 int fvr = first_visible_rbe(&lines);
1205
1206 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1207 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1208 return;
1209 }
1210 scroll_position = fvr + 1;
1211 for (; scroll_position > 0; scroll_position--) {
1212 first_visible_rbe(&lines);
1213 if (lines == bot.lines)
1214 break;
1215 }
1216 redraw_bot_win();
1217 print_scroll_msg();
1218 }
1219
1220 static void com_scroll_down(void)
1221 {
1222 struct rb_entry *rbe;
1223 int rbe_lines;
1224
1225 if (!scroll_position) {
1226 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1227 return;
1228 }
1229 scroll_position--;
1230 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1231 rbe_lines = NUM_LINES(rbe->len);
1232 wscrl(bot.win, rbe_lines);
1233 wmove(bot.win, bot.lines - rbe_lines, 0);
1234 wattron(bot.win, COLOR_PAIR(rbe->color));
1235 waddstr(bot.win, rbe->msg);
1236 wrefresh(bot.win);
1237 print_scroll_msg();
1238 }
1239
1240 static void com_scroll_up(void)
1241 {
1242 struct rb_entry *rbe = NULL;
1243 unsigned lines;
1244 int i, first_rbe, num_scroll;
1245
1246 /* the entry that is going to vanish */
1247 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1248 if (!rbe)
1249 goto err_out;
1250 num_scroll = NUM_LINES(rbe->len);
1251 first_rbe = first_visible_rbe(&lines);
1252 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1253 goto err_out;
1254 scroll_position++;
1255 wscrl(bot.win, -num_scroll);
1256 i = draw_top_rbe(&lines);
1257 if (i < 0)
1258 goto err_out;
1259 while (i > 0 && lines < num_scroll) {
1260 int rbe_lines;
1261 rbe = ringbuffer_get(bot_win_rb, --i);
1262 if (!rbe)
1263 break;
1264 rbe_lines = NUM_LINES(rbe->len);
1265 lines += rbe_lines;
1266 // fprintf(stderr, "msg: %s\n", rbe->msg);
1267 wattron(bot.win, COLOR_PAIR(rbe->color));
1268 waddstr(bot.win, "\n");
1269 waddstr(bot.win, rbe->msg);
1270 if (!i)
1271 break;
1272 i--;
1273 }
1274 wrefresh(bot.win);
1275 print_scroll_msg();
1276 return;
1277 err_out:
1278 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1279 }
1280
1281 static void com_ll_decr(void)
1282 {
1283 if (loglevel <= LL_DEBUG) {
1284 print_in_bar(COLOR_ERRMSG,
1285 "loglevel already at maximal verbosity\n");
1286 return;
1287 }
1288 loglevel--;
1289 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1290 }
1291
1292 static void com_ll_incr(void)
1293 {
1294 if (loglevel >= LL_EMERG) {
1295 print_in_bar(COLOR_ERRMSG,
1296 "loglevel already at minimal verbosity\n");
1297 return;
1298 }
1299 loglevel++;
1300 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1301 }
1302
1303 /*
1304 * reread configuration, terminate on errors
1305 */
1306 static void com_reread_conf(void)
1307 {
1308 char *cf = configfile_exists();
1309 struct gui_cmdline_parser_params params = {
1310 .override = 1,
1311 .initialize = 1,
1312 .check_required = 0,
1313 .check_ambiguity = 0,
1314 .print_errors = 0,
1315 };
1316
1317 if (!cf) {
1318 PARA_WARNING_LOG("there is no configuration to read\n");
1319 return;
1320 }
1321 PARA_INFO_LOG("rereading command line options and config file\n");
1322 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1323 /*
1324 * Despite .print_errors is set to 0, gengetopt will print to stderr
1325 * anyway, and exit on errors. So we have to shutdown curses first.
1326 */
1327 shutdown_curses();
1328 gui_cmdline_parser_config_file(cf, &conf, &params);
1329 init_curses();
1330 PARA_NOTICE_LOG("config file reloaded\n");
1331 if (check_key_map_args() < 0)
1332 finish(EXIT_FAILURE);
1333 }
1334
1335 static void com_help(void)
1336 {
1337 int i;
1338
1339 for (i = 0; i < conf.key_map_given; ++i) {
1340 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1341 const char *handler_text = "???", *desc = NULL;
1342
1343 if (!split_key_map(tmp, &handler, &arg)) {
1344 free(tmp);
1345 return;
1346 }
1347 switch (*handler) {
1348 case 'i':
1349 handler_text = "internal";
1350 desc = command_list[find_cmd_byname(arg)].description;
1351 break;
1352 case 'x': handler_text = "external"; break;
1353 case 'd': handler_text = "display "; break;
1354 case 'p': handler_text = "para "; break;
1355 }
1356 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1357 strlen(arg) < 8? "\t" : "",
1358 desc? desc : "");
1359 free(tmp);
1360 }
1361 for (i = 0; command_list[i].handler; i++) {
1362 struct gui_command gc = command_list[i];
1363
1364 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1365 strlen(gc.name) < 8? "\t" : "",
1366 gc.description);
1367 }
1368 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1369 "for more info");
1370 }
1371
1372 static void com_shrink_top_win(void)
1373 {
1374 if (top.lines <= theme.top_lines_min) {
1375 PARA_WARNING_LOG("can not decrease top window\n");
1376 return;
1377 }
1378 init_wins(top.lines - 1);
1379 wclear(top.win);
1380 print_all_items();
1381 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1382 }
1383
1384 static void com_enlarge_top_win(void)
1385 {
1386 if (bot.lines < 3) {
1387 PARA_WARNING_LOG("can not increase top window\n");
1388 return;
1389 }
1390 init_wins(top.lines + 1);
1391 wclear(top.win);
1392 print_all_items();
1393 print_in_bar(COLOR_MSG, "increased top window");
1394 }
1395
1396 static void com_version(void)
1397 {
1398 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1399 }
1400
1401 __noreturn static void com_quit(void)
1402 {
1403 finish(0);
1404 }
1405
1406 static void com_refresh(void)
1407 {
1408 shutdown_curses();
1409 init_curses();
1410 }
1411
1412 static void change_theme(int next)
1413 {
1414 if (next)
1415 next_theme(&theme);
1416 else
1417 prev_theme(&theme);
1418 /* This seems to be needed twice, why? */
1419 com_refresh();
1420 com_refresh();
1421 PARA_NOTICE_LOG("new theme: %s\n", theme.name);
1422 }
1423
1424 static void com_next_theme(void)
1425 {
1426 change_theme(1);
1427 }
1428
1429 static void com_prev_theme(void)
1430 {
1431 change_theme(0);
1432 }
1433
1434
1435 static void handle_command(int c)
1436 {
1437 int i;
1438
1439 /* first check user-defined key bindings */
1440 for (i = 0; i < conf.key_map_given; ++i) {
1441 char *tmp, *handler, *arg;
1442
1443 tmp = para_strdup(conf.key_map_arg[i]);
1444 if (!split_key_map(tmp, &handler, &arg)) {
1445 free(tmp);
1446 return;
1447 }
1448 if (strcmp(tmp, km_keyname(c))) {
1449 free(tmp);
1450 continue;
1451 }
1452 if (*handler == 'd')
1453 display_cmd(arg);
1454 else if (*handler == 'x')
1455 external_cmd(arg);
1456 else if (*handler == 'p')
1457 para_cmd(arg);
1458 else if (*handler == 'i') {
1459 int num = find_cmd_byname(arg);
1460 if (num >= 0)
1461 command_list[num].handler();
1462 }
1463 free(tmp);
1464 return;
1465 }
1466 /* not found, check internal key bindings */
1467 for (i = 0; command_list[i].handler; i++) {
1468 if (!strcmp(km_keyname(c), command_list[i].key)) {
1469 command_list[i].handler();
1470 return;
1471 }
1472 }
1473 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1474 km_keyname(c));
1475 }
1476
1477 __noreturn static void print_help_and_die(void)
1478 {
1479 struct ggo_help h = DEFINE_GGO_HELP(gui);
1480 bool d = conf.detailed_help_given;
1481
1482 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1483 exit(0);
1484 }
1485
1486 int main(int argc, char *argv[])
1487 {
1488 int ret;
1489 char *cf;
1490
1491 _argc = argc;
1492 _argv = argv;
1493
1494 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1495 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1496 version_handle_flag("gui", conf.version_given);
1497 if (conf.help_given || conf.detailed_help_given)
1498 print_help_and_die();
1499 cf = configfile_exists();
1500 if (!cf && conf.config_file_given) {
1501 fprintf(stderr, "can not read config file %s\n",
1502 conf.config_file_arg);
1503 exit(EXIT_FAILURE);
1504 }
1505 if (cf) {
1506 struct gui_cmdline_parser_params params = {
1507 .override = 0,
1508 .initialize = 0,
1509 .check_required = 0,
1510 .check_ambiguity = 0,
1511 .print_errors = 1,
1512 };
1513 gui_cmdline_parser_config_file(cf, &conf, &params);
1514 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1515 }
1516 if (check_key_map_args() < 0) {
1517 fprintf(stderr, "invalid key map\n");
1518 exit(EXIT_FAILURE);
1519 }
1520 init_theme_or_die(conf.theme_arg, &theme);
1521 setup_signal_handling();
1522 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1523 setlocale(LC_CTYPE, "");
1524 initscr(); /* needed only once, always successful */
1525 init_curses();
1526 for (;;) {
1527 print_status_bar();
1528 ret = do_select(GETCH_MODE);
1529 if (!ret)
1530 continue;
1531 print_in_bar(COLOR_MSG, " ");
1532 handle_command(ret);
1533 }
1534 }