afs: Use nonblocking API for server commands.
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2010 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 <dirent.h>
13 #include <curses.h>
14
15 #include "gui.cmdline.h"
16 #include "para.h"
17 #include "gui.h"
18 #include "string.h"
19 #include "ringbuffer.h"
20 #include "fd.h"
21 #include "error.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "signal.h"
25
26 /** define the array of error lists needed by para_gui */
27 INIT_GUI_ERRLISTS;
28 static char *stat_content[NUM_STAT_ITEMS];
29
30 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
31
32 static int signal_pipe;
33
34 static struct win_data {
35 WINDOW *win;
36 NCURSES_SIZE_T begx;
37 NCURSES_SIZE_T begy;
38 NCURSES_SIZE_T cols;
39 NCURSES_SIZE_T lines;
40 } top, bot, sb, in, sep;
41
42 #define RINGBUFFER_SIZE 512
43 struct rb_entry {
44 char *msg;
45 size_t len;
46 int color;
47 };
48 static struct ringbuffer *bot_win_rb;
49 #define NUM_LINES(len) (1 + (len) / bot.cols)
50
51 static unsigned scroll_position;
52
53 static int cmd_died, curses_active;
54 static pid_t cmd_pid;
55
56 static int command_pipe = -1;
57 static int audiod_pipe = -1;
58 static struct gui_args_info conf;
59
60 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
61
62
63 #define COLOR_STATUSBAR 52
64 #define COLOR_COMMAND 53
65 #define COLOR_OUTPUT 54
66 #define COLOR_MSG 55
67 #define COLOR_ERRMSG 56
68 #define COLOR_WELCOME 57
69 #define COLOR_SEPARATOR 58
70 #define COLOR_TOP 59
71 #define COLOR_BOT 60
72
73 struct gui_command {
74 const char *key;
75 const char *name;
76 const char *description;
77 void (*handler)(void);
78 };
79
80 struct stat_item {
81 char name[MAXLINE];
82 char prefix[MAXLINE];
83 char postfix[MAXLINE];
84 unsigned y;
85 unsigned x;
86 unsigned len;
87 int fg, bg;
88 int align;
89 char content[MAXLINE];
90 };
91
92 static struct gui_theme theme;
93
94 static int _argc;
95 static char **_argv;
96
97 static void com_help(void);
98 static void com_reread_conf(void);
99 static void com_enlarge_top_win(void);
100 static void com_shrink_top_win(void);
101 static void com_version(void);
102 static void com_quit(void);
103 static void com_refresh(void);
104 static void com_ll_incr(void);
105 static void com_ll_decr(void);
106 static void com_prev_theme(void);
107 static void com_next_theme(void);
108 static void com_scroll_up(void);
109 static void com_scroll_down(void);
110 static void com_page_up(void);
111 static void com_page_down(void);
112
113 static struct gui_command command_list[] = {
114 {
115 .key = "?",
116 .name = "help",
117 .description = "print help",
118 .handler = com_help
119 }, {
120 .key = "+",
121 .name = "enlarge_win",
122 .description = "enlarge the top window",
123 .handler = com_enlarge_top_win
124 }, {
125 .key = "-",
126 .name = "shrink_win",
127 .description = "shrink the top window",
128 .handler = com_shrink_top_win
129 }, {
130 .key = "r",
131 .name = "reread_conf",
132 .description = "reread configuration file",
133 .handler = com_reread_conf
134 }, {
135 .key = "q",
136 .name = "quit",
137 .description = "exit para_gui",
138 .handler = com_quit
139 }, {
140 .key = "^L",
141 .name = "refresh",
142 .description = "redraw the screen",
143 .handler = com_refresh
144 }, {
145 .key = ".",
146 .name = "next_theme",
147 .description = "switch to next theme",
148 .handler = com_next_theme
149 }, {
150 .key = ",",
151 .name = "prev_theme",
152 .description = "switch to previous stream",
153 .handler = com_prev_theme
154 }, {
155 .key = ">",
156 .name = "ll_incr",
157 .description = "increase loglevel (decreases verbosity)",
158 .handler = com_ll_incr
159 }, {
160 .key = "<",
161 .name = "ll_decr",
162 .description = "decrease loglevel (increases verbosity)",
163 .handler = com_ll_decr
164 }, {
165 .key = "V",
166 .name = "version",
167 .description = "show the para_gui version",
168 .handler = com_version
169 }, {
170 .key = "<up>",
171 .name = "scroll_up",
172 .description = "scroll up one line",
173 .handler = com_scroll_up
174 }, {
175 .key = "<down>",
176 .name = "scroll_down",
177 .description = "scroll down one line",
178 .handler = com_scroll_down
179 }, {
180 .key = "<ppage>",
181 .name = "page_up",
182 .description = "scroll up one page",
183 .handler = com_page_up
184 }, {
185 .key = "<npage>",
186 .name = "page_down",
187 .description = "scroll down one page",
188 .handler = com_page_down
189 }, {
190 .handler = NULL
191 }
192 };
193
194 static int para_open_audiod_pipe(char *cmd)
195 {
196 int fds[3] = {0, 1, 0};
197 pid_t pid;
198 int ret = para_exec_cmdline_pid(&pid, cmd, fds);
199 if (ret < 0)
200 return ret;
201 ret = mark_fd_nonblocking(fds[1]);
202 if (ret > 0)
203 return fds[1];
204 close(fds[1]);
205 return ret;
206 }
207
208 static int find_cmd_byname(char *name)
209 {
210 int i;
211
212 for (i = 0; command_list[i].handler; i++)
213 if (!strcmp(command_list[i].name, name))
214 return i;
215 return -1;
216 }
217
218 /* taken from mutt */
219 static char *km_keyname(int c)
220 {
221 static char buf[10];
222
223 if (c == KEY_UP) {
224 sprintf(buf, "<up>");
225 return buf;
226 }
227 if (c == KEY_DOWN) {
228 sprintf(buf, "<down>");
229 return buf;
230 }
231 if (c == KEY_LEFT) {
232 sprintf(buf, "<left>");
233 return buf;
234 }
235 if (c == KEY_RIGHT) {
236 sprintf(buf, "<right>");
237 return buf;
238 }
239 if (c == KEY_NPAGE) {
240 sprintf(buf, "<npage>");
241 return buf;
242 }
243 if (c == KEY_PPAGE) {
244 sprintf(buf, "<ppage>");
245 return buf;
246 }
247 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
248 if (c < 0)
249 c += 256;
250 if (c < 128) {
251 buf[0] = '^';
252 buf[1] = (c + '@') & 0x7f;
253 buf[2] = 0;
254 } else
255 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
256 (c >> 3) & 7, c & 7);
257 } else if (c >= KEY_F0 && c < KEY_F(256))
258 sprintf(buf, "<F%d>", c - KEY_F0);
259 else if (isprint(c))
260 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
261 else
262 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
263 return buf;
264 }
265
266 static char *configfile_exists(void)
267 {
268 static char *config_file;
269 char *tmp;
270
271 if (!conf.config_file_given) {
272 if (!config_file) {
273 char *home = para_homedir();
274 config_file = make_message("%s/.paraslash/gui.conf",
275 home);
276 free(home);
277 }
278 tmp = config_file;
279 } else
280 tmp = conf.config_file_arg;
281 return file_exists(tmp)? tmp: NULL;
282 }
283
284 /*
285 * print num spaces to curses window
286 */
287 static void add_spaces(WINDOW* win, unsigned int num)
288 {
289 while (num > 0) {
290 num--;
291 waddstr(win, " ");
292 }
293 }
294
295 /*
296 * print aligned string to curses window. This function always prints
297 * exactly len chars.
298 */
299 static int align_str(WINDOW* win, char *str, unsigned int len,
300 unsigned int align)
301 {
302 int i, num; /* of spaces */
303
304 if (!win || !str)
305 return -1;
306 num = len - strlen(str);
307 if (num < 0) {
308 str[len] = '\0';
309 num = 0;
310 }
311 /* replace newlines by spaces */
312 for (i = 0; i < len && str[i]; i++) {
313 if (str[i] == '\n')
314 str[i] = ' ';
315 }
316 if (align == LEFT) {
317 waddstr(win, str);
318 add_spaces(win, num);
319 } else if (align == RIGHT) {
320 add_spaces(win, num);
321 waddstr(win, str);
322 } else {
323 add_spaces(win, num / 2);
324 waddstr(win, str[0]? str: "");
325 add_spaces(win, num - num / 2);
326 }
327 return 1;
328 }
329
330 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
331 {
332 char *msg;
333
334 if (!curses_active)
335 return;
336 wattron(in.win, COLOR_PAIR(color));
337 PARA_VSPRINTF(fmt, msg);
338 wmove(in.win, 0, 0);
339 align_str(in.win, msg, sb.cols, LEFT);
340 free(msg);
341 wrefresh(in.win);
342 }
343
344 /*
345 * update the status bar
346 */
347 static void print_status_bar(void)
348 {
349 char *tmp;
350
351 if (!curses_active)
352 return;
353 tmp = para_strdup(STANDARD_STATUS_BAR);
354 wmove(sb.win, 0, 0);
355 align_str(sb.win, tmp, sb.cols, CENTER);
356 free(tmp);
357 wrefresh(sb.win);
358 }
359
360 /*
361 * get the number of the oldest rbe that is (partially) visible. On return,
362 * lines contains the sum of the number of lines of all visable entries. If the
363 * first one is only partially visible, lines is greater than bot.lines.
364 */
365 static int first_visible_rbe(unsigned *lines)
366 {
367 int i;
368 *lines = 0;
369 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
370 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
371 int rbe_lines;
372 if (!rbe)
373 return i - 1;
374 // fprintf(stderr, "found: %s\n", rbe->msg);
375 rbe_lines = NUM_LINES(rbe->len);
376 if (rbe_lines > bot.lines)
377 return -1;
378 *lines += rbe_lines;
379 if (*lines >= bot.lines)
380 return i;
381 }
382 return RINGBUFFER_SIZE - 1;
383 }
384
385 static int draw_top_rbe(unsigned *lines)
386 {
387 unsigned len;
388 int offset, fvr = first_visible_rbe(lines);
389 struct rb_entry *rbe;
390
391 if (fvr < 0)
392 return -1;
393 wmove(bot.win, 0, 0);
394 rbe = ringbuffer_get(bot_win_rb, fvr);
395 if (!rbe)
396 return -1;
397 /* first rbe might be only partially visible */
398 offset = (*lines - bot.lines) * bot.cols;
399 len = strlen(rbe->msg);
400 if (offset < 0 || len < offset)
401 return -1;
402 wattron(bot.win, COLOR_PAIR(rbe->color));
403 waddstr(bot.win, rbe->msg + offset);
404 *lines = NUM_LINES(len - offset);
405 return fvr;
406 }
407
408 static void redraw_bot_win(void)
409 {
410 unsigned lines;
411 int i;
412
413 wmove(bot.win, 0, 0);
414 wclear(bot.win);
415 i = draw_top_rbe(&lines);
416 if (i <= 0)
417 goto out;
418 while (i > 0 && lines < bot.lines) {
419 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
420 if (!rbe) {
421 lines++;
422 waddstr(bot.win, "\n");
423 continue;
424 }
425 lines += NUM_LINES(rbe->len);
426 wattron(bot.win, COLOR_PAIR(rbe->color));
427 waddstr(bot.win, "\n");
428 waddstr(bot.win, rbe->msg);
429 }
430 out:
431 wrefresh(bot.win);
432 }
433
434 static void rb_add_entry(int color, char *msg)
435 {
436 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
437 int x, y;
438 new->color = color;
439 new->len = strlen(msg);
440 new->msg = msg;
441 old = ringbuffer_add(bot_win_rb, new);
442 // fprintf(stderr, "added: %s\n", new->msg);
443 if (old) {
444 free(old->msg);
445 free(old);
446 }
447 if (scroll_position) {
448 /* discard current scrolling, like xterm does */
449 scroll_position = 0;
450 redraw_bot_win();
451 return;
452 }
453 wattron(bot.win, COLOR_PAIR(color));
454 getyx(bot.win, y, x);
455 if (y || x)
456 waddstr(bot.win, "\n");
457 waddstr(bot.win, msg);
458 }
459
460 /*
461 * print formated output to bot win and refresh
462 */
463 __printf_2_3 static void outputf(int color, const char* fmt,...)
464 {
465 char *msg;
466
467 if (!curses_active)
468 return;
469 PARA_VSPRINTF(fmt, msg);
470 rb_add_entry(color, msg);
471 wrefresh(bot.win);
472 }
473
474 static int add_output_line(char *line, __a_unused void *data)
475 {
476 if (!curses_active)
477 return 1;
478 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
479 return 1;
480 }
481
482 static int loglevel;
483
484 __printf_2_3 void para_log(int ll, const char *fmt,...)
485 {
486 int color;
487 char *msg;
488
489 if (ll < loglevel || !curses_active)
490 return;
491 switch (ll) {
492 case LL_DEBUG:
493 case LL_INFO:
494 case LL_NOTICE:
495 color = COLOR_MSG;
496 break;
497 default:
498 color = COLOR_ERRMSG;
499 }
500 PARA_VSPRINTF(fmt, msg);
501 chop(msg);
502 rb_add_entry(color, msg);
503 wrefresh(bot.win);
504 }
505
506 static void setup_signal_handling(void)
507 {
508 signal_pipe = para_signal_init();
509 para_install_sighandler(SIGINT);
510 para_install_sighandler(SIGTERM);
511 para_install_sighandler(SIGCHLD);
512 para_install_sighandler(SIGWINCH);
513 para_install_sighandler(SIGUSR1);
514 para_sigaction(SIGHUP, SIG_IGN);
515 }
516
517 __noreturn static void do_exit(int ret)
518 {
519 para_sigaction(SIGTERM, SIG_IGN);
520 kill(0, SIGTERM);
521 exit(ret);
522 }
523
524 static void shutdown_curses(void)
525 {
526 if (!curses_active)
527 return;
528 def_prog_mode();
529 curses_active = 0;
530 endwin();
531 }
532
533 __noreturn static void finish(int ret)
534 {
535 shutdown_curses();
536 do_exit(ret);
537 }
538
539 /*
540 * exit curses and print given message to stdout/stderr
541 */
542 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
543 {
544 va_list argp;
545 FILE *outfd = ret? stderr: stdout;
546
547 shutdown_curses();
548 va_start(argp, fmt);
549 vfprintf(outfd, fmt, argp);
550 va_end(argp);
551 do_exit(ret);
552 }
553
554 static void print_welcome(void)
555 {
556 if (loglevel > LL_NOTICE)
557 return;
558 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
559 " \"" CODENAME "\". Theme: %s", theme.name);
560 wclrtoeol(bot.win);
561 }
562
563 /*
564 * init all windows
565 */
566 static void init_wins(int top_lines)
567 {
568 int i;
569
570 top.lines = top_lines;
571 top.cols = COLS;
572 top.begy = 0;
573 top.begx = 0;
574
575 bot.lines = LINES - top.lines - 3;
576 bot.cols = COLS;
577 bot.begy = top.lines + 1;
578 bot.begx = 0;
579
580 sb.lines = 1;
581 sb.cols = COLS;
582 sb.begy = LINES - 2;
583 sb.begx = 0;
584
585 in.lines = 1;
586 in.cols = COLS;
587 in.begy = LINES - 1;
588 in.begx = 0;
589
590 sep.lines = 1;
591 sep.cols = COLS;
592 sep.begy = top.lines;
593 sep.begx = 0;
594
595 assume_default_colors(theme.default_fg, theme.default_bg);
596 if (top.win) {
597 mvwin(top.win, top.begy, top.begx);
598 wresize(top.win, top.lines, top.cols);
599
600 mvwin(sb.win, sb.begy, sb.begx);
601 wresize(sb.win, sb.lines, sb.cols);
602
603 mvwin(sep.win, sep.begy, sep.begx);
604 wresize(sep.win, sep.lines, sep.cols);
605
606 mvwin(bot.win, bot.begy, bot.begx);
607 wresize(bot.win, bot.lines, bot.cols);
608
609 mvwin(in.win, in.begy, in.begx);
610 wresize(in.win, in.lines, in.cols);
611 } else {
612 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
613 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
614 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
615 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
616 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
617 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
618 msg_n_exit(1, "Error: Cannot create curses windows\n");
619 wclear(bot.win);
620 wclear(sb.win);
621 wclear(in.win);
622 scrollok(bot.win, 1);
623 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
624 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
625 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
626 wattron(top.win, COLOR_PAIR(COLOR_TOP));
627 nodelay(top.win, 1);
628 nodelay(bot.win, 1);
629 nodelay(sb.win, 1);
630 nodelay(in.win, 0);
631
632 keypad(top.win, 1);
633 keypad(bot.win, 1);
634 keypad(sb.win, 1);
635 keypad(in.win, 1);
636 print_status_bar();
637 }
638 wmove(sep.win, 0, 0);
639 for (i = 1; i <= COLS; i++)
640 waddstr(sep.win, theme.sep_str);
641 wclear(top.win);
642 //wclear(bot.win);
643 wnoutrefresh(top.win);
644 wnoutrefresh(bot.win);
645 //wnoutrefresh(sb.win);
646 print_status_bar();
647 wnoutrefresh(in.win);
648 wnoutrefresh(sep.win);
649 doupdate();
650 }
651
652 static void check_geometry(void)
653 {
654 if (LINES < theme.lines_min || COLS < theme.cols_min)
655 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
656 " (need at least %dx%d)\n", COLS, LINES,
657 theme.cols_min, theme.lines_min);
658 }
659
660 /*
661 * Print stat item #i to curses window
662 */
663 static void print_stat_item(int i)
664 {
665 char *tmp;
666 struct stat_item_data d = theme.data[i];
667 char *c = stat_content[i];
668
669 if (!curses_active || !d.len || !c)
670 return;
671 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
672 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
673 wrefresh(top.win);
674 wattron(top.win, COLOR_PAIR(i + 1));
675 align_str(top.win, tmp, d.len * COLS / 100, d.align);
676 free(tmp);
677 wrefresh(top.win);
678 }
679
680 static int update_item(int item_num, char *buf)
681 {
682 char **c = stat_content + item_num;
683
684 free(*c);
685 if (buf && buf[0])
686 goto dup;
687 switch (item_num) {
688 case SI_ARTIST:
689 *c = para_strdup("(artist tag not set)");
690 goto print;
691 case SI_TITLE:
692 *c = para_strdup("(title tag not set)");
693 goto print;
694 case SI_YEAR:
695 *c = para_strdup("????");
696 goto print;
697 case SI_ALBUM:
698 *c = para_strdup("(album tag not set)");
699 goto print;
700 case SI_COMMENT:
701 *c = para_strdup("(comment tag not set)");
702 goto print;
703 }
704 dup:
705 *c = para_strdup(buf);
706 print:
707 print_stat_item(item_num);
708 return 1;
709 }
710
711 static int read_audiod_pipe(int fd)
712 {
713 static char *buf;
714 static int bufsize, loaded;
715 int ret;
716
717 if (loaded >= bufsize) {
718 if (bufsize > 1000 * 1000) {
719 loaded = 0;
720 return 0;
721 }
722 bufsize += bufsize + 1000;
723 buf = para_realloc(buf, bufsize);
724 }
725 assert(loaded < bufsize);
726 ret = read(fd, buf + loaded, bufsize - loaded);
727 if (ret <= 0)
728 return ret;
729 loaded += ret;
730 ret = for_each_stat_item(buf, loaded, update_item);
731 if (ret < 0)
732 return ret;
733 if (ret > 0 && ret < loaded)
734 memmove(buf, buf + loaded - ret, ret);
735 loaded = ret;
736 return 1;
737 }
738
739 static void print_all_items(void)
740 {
741 int i;
742
743 if (!curses_active)
744 return;
745 FOR_EACH_STATUS_ITEM(i)
746 print_stat_item(i);
747 }
748
749 static void clear_all_items(void)
750 {
751 int i;
752
753 FOR_EACH_STATUS_ITEM(i) {
754 free(stat_content[i]);
755 stat_content[i] = para_strdup("");
756 }
757 }
758
759 static void init_colors(void)
760 {
761 int i;
762
763 if (!has_colors())
764 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
765 start_color();
766 FOR_EACH_STATUS_ITEM(i)
767 if (theme.data[i].len)
768 init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
769 init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
770 init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
771 init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
772 init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
773 init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
774 init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
775 init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
776 init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
777 init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
778 }
779
780 /*
781 * (re-)initialize the curses library FIXME: Error checking
782 */
783 static void init_curses(void)
784 {
785 curses_active = 1;
786 if (top.win && refresh() == ERR) { /* refesh is really needed */
787 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
788 }
789 check_geometry();
790 curs_set(0); /* make cursor invisible, ignore errors */
791 // if (noraw() == ERR);
792 // msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
793 // "raw mode\n");
794 nonl(); /* tell curses not to do NL->CR/NL on output */
795 noecho(); /* don't echo input */
796 cbreak(); /* take input chars one at a time, no wait for \n */
797 //reset_prog_mode();
798 init_colors();
799 clear();
800 init_wins(theme.top_lines_default);
801 print_all_items();
802 noecho(); /* don't echo input */
803 }
804
805
806 static void check_sigchld(void)
807 {
808 int ret;
809 pid_t pid;
810 reap_next_child:
811 ret = para_reap_child(&pid);
812 if (ret <= 0)
813 return;
814 if (pid == cmd_pid) {
815 cmd_pid = 0;
816 cmd_died = 1;
817 }
818 goto reap_next_child;
819 }
820
821 /*
822 * This sucker modifies its first argument. *handler and *arg are
823 * pointers to 0-terminated strings (inside line). Crap.
824 */
825 static int split_key_map(char *line, char **handler, char **arg)
826 {
827 if (!(*handler = strchr(line + 1, ':')))
828 goto err_out;
829 **handler = '\0';
830 (*handler)++;
831 if (!(*arg = strchr(*handler, ':')))
832 goto err_out;
833 **arg = '\0';
834 (*arg)++;
835 return 1;
836 err_out:
837 return 0;
838 }
839
840 static int check_key_map_args(void)
841 {
842 char *s;
843 int i, ret = -1;
844 char *tmp = NULL, *handler, *arg;
845
846 for (i = 0; i < conf.key_map_given; ++i) {
847 s = conf.key_map_arg[i];
848 if (!(*s))
849 goto err_out;
850 free(tmp);
851 tmp = para_strdup(s);
852 if (!split_key_map(tmp, &handler, &arg))
853 goto err_out;
854 if (strlen(handler) != 1)
855 goto err_out;
856 if (*handler != 'x'
857 && *handler != 'd'
858 && *handler != 'i'
859 && *handler != 'p')
860 goto err_out;
861 if (*handler != 'i')
862 continue;
863 if (find_cmd_byname(arg) < 0)
864 goto err_out;
865 }
866 ret = 0;
867 err_out:
868 free(tmp);
869 return ret;
870 }
871
872 /*
873 * React to various signal-related events
874 */
875 static void handle_signal(int sig)
876 {
877 switch (sig) {
878 case SIGTERM:
879 msg_n_exit(EXIT_FAILURE,
880 "only the good die young (caught SIGTERM))\n");
881 return;
882 case SIGWINCH:
883 if (curses_active) {
884 shutdown_curses();
885 init_curses();
886 redraw_bot_win();
887 }
888 return;
889 case SIGINT:
890 PARA_WARNING_LOG("caught SIGINT, reset");
891 /* Nothing to do. SIGINT killed our child which gets noticed
892 * by do_select and resets everything.
893 */
894 return;
895 case SIGUSR1:
896 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
897 com_reread_conf();
898 return;
899 case SIGCHLD:
900 check_sigchld();
901 return;
902 }
903 }
904
905 static int open_audiod_pipe(void)
906 {
907 static int init = 1;
908
909 if (init)
910 init = 0;
911 else
912 sleep(1);
913 return para_open_audiod_pipe(conf.stat_cmd_arg);
914 }
915
916 /*
917 * This is the core select loop. Besides the (internal) signal
918 * pipe, the following other fds are checked according to the mode:
919 *
920 * GETCH_MODE: check stdin, return when key is pressed
921 *
922 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
923 * of output has been read or when other end has closed command pipe or
924 * when any key is pressed.
925 *
926 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
927 * is running. During that time curses is disabled. Returns when
928 * cmd_pid == 0.
929 */
930 static int do_select(int mode)
931 {
932 fd_set rfds;
933 int ret;
934 int max_fileno, cp_numread = 1;
935 char command_buf[4096] = "";
936 int cbo = 0; /* command buf offset */
937 struct timeval tv;
938 repeat:
939 tv.tv_sec = conf.timeout_arg / 1000;
940 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
941 // ret = refresh_status();
942 FD_ZERO(&rfds);
943 max_fileno = 0;
944 /* audiod pipe */
945 if (audiod_pipe < 0)
946 audiod_pipe = open_audiod_pipe();
947 if (audiod_pipe >= 0)
948 para_fd_set(audiod_pipe, &rfds, &max_fileno);
949 /* signal pipe */
950 para_fd_set(signal_pipe, &rfds, &max_fileno);
951 /* command pipe only for COMMAND_MODE */
952 if (command_pipe >= 0 && mode == COMMAND_MODE)
953 para_fd_set(command_pipe, &rfds, &max_fileno);
954 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
955 if (ret <= 0)
956 goto check_return; /* skip fd checks */
957 /* signals */
958 ret = para_next_signal(&rfds);
959 if (ret > 0)
960 handle_signal(ret);
961 /* read command pipe if ready */
962 if (command_pipe >= 0 && mode == COMMAND_MODE &&
963 FD_ISSET(command_pipe, &rfds)) {
964 cp_numread = read(command_pipe, command_buf + cbo,
965 sizeof(command_buf) - 1 - cbo);
966 if (cp_numread >= 0)
967 cbo += cp_numread;
968 else {
969 if (cp_numread < 0)
970 PARA_ERROR_LOG("read error (%d)", cp_numread);
971 close(command_pipe);
972 command_pipe = -1;
973 }
974 }
975 if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
976 if (read_audiod_pipe(audiod_pipe) <= 0) {
977 close(audiod_pipe);
978 audiod_pipe = -1;
979 clear_all_items();
980 free(stat_content[SI_BASENAME]);
981 stat_content[SI_BASENAME] =
982 para_strdup("audiod not running!?");
983 print_all_items();
984 }
985 check_return:
986 switch (mode) {
987 case COMMAND_MODE:
988 if (cp_numread <= 0 && !cbo) /* command complete */
989 return 0;
990 if (cbo)
991 cbo = for_each_line(command_buf, cbo,
992 &add_output_line, NULL);
993 if (cp_numread <= 0)
994 cbo = 0;
995 wrefresh(bot.win);
996 ret = wgetch(top.win);
997 if (ret != ERR && ret != KEY_RESIZE) {
998 if (command_pipe) {
999 close(command_pipe);
1000 command_pipe = -1;
1001 }
1002 if (cmd_pid)
1003 kill(cmd_pid, SIGTERM);
1004 return -1;
1005 }
1006 break;
1007 case GETCH_MODE:
1008 ret = wgetch(top.win);
1009 if (ret != ERR && ret != KEY_RESIZE)
1010 return ret;
1011 break;
1012 case EXTERNAL_MODE:
1013 if (cmd_died) {
1014 cmd_died = 0;
1015 return 0;
1016 }
1017 }
1018 goto repeat;
1019 }
1020
1021 /*
1022 * read from command pipe and print data to bot window
1023 */
1024 static int send_output(void)
1025 {
1026 int ret;
1027
1028 if (command_pipe < 0)
1029 return 0;
1030 ret = mark_fd_nonblocking(command_pipe);
1031 if (ret < 0) {
1032 close(command_pipe);
1033 return ret;
1034 }
1035 if (do_select(COMMAND_MODE) >= 0)
1036 PARA_INFO_LOG("command complete");
1037 else
1038 PARA_NOTICE_LOG("command aborted");
1039 print_in_bar(COLOR_MSG, " ");
1040 return 1;
1041 }
1042
1043 static int client_cmd_cmdline(char *cmd)
1044 {
1045 int ret, fds[3] = {0, 1, 0};
1046 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1047
1048 outputf(COLOR_COMMAND, "%s", c);
1049 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1050 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1051 free(c);
1052 if (ret < 0)
1053 return -1;
1054 command_pipe = fds[1];
1055 return send_output();
1056 }
1057
1058 /*
1059 * exec command and print output to bot win
1060 */
1061 static int display_cmd(char *cmd)
1062 {
1063 int fds[3] = {0, 1, 0};
1064
1065 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1066 outputf(COLOR_COMMAND, "%s", cmd);
1067 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1068 return -1;
1069 command_pipe = fds[1];
1070 return send_output();
1071 }
1072
1073 /*
1074 * shutdown curses and stat pipe before executing external commands
1075 */
1076 static int external_cmd(char *cmd)
1077 {
1078 int fds[3] = {-1, -1, -1};
1079
1080 if (cmd_pid)
1081 return -1;
1082 shutdown_curses();
1083 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1084 cmd_died = 0;
1085 do_select(EXTERNAL_MODE);
1086 init_curses();
1087 return 0;
1088 }
1089
1090 static void print_scroll_msg(void)
1091 {
1092 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1093 int first_rbe = first_visible_rbe(&lines_total);
1094 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1095 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1096 }
1097
1098 static void com_page_down(void)
1099 {
1100 unsigned lines = 0;
1101 int i = scroll_position;
1102 while (lines < bot.lines && --i > 0) {
1103 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1104 if (!rbe)
1105 break;
1106 lines += NUM_LINES(strlen(rbe->msg));
1107 }
1108 if (lines) {
1109 scroll_position = i;
1110 redraw_bot_win();
1111 print_scroll_msg();
1112 return;
1113 }
1114 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1115 }
1116
1117 static void com_page_up(void)
1118 {
1119 unsigned lines;
1120 int fvr = first_visible_rbe(&lines);
1121
1122 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1123 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1124 return;
1125 }
1126 scroll_position = fvr + 1;
1127 for (; scroll_position > 0; scroll_position--) {
1128 first_visible_rbe(&lines);
1129 if (lines == bot.lines)
1130 break;
1131 }
1132 redraw_bot_win();
1133 print_scroll_msg();
1134 }
1135
1136 static void com_scroll_down(void)
1137 {
1138 struct rb_entry *rbe;
1139 int rbe_lines;
1140
1141 if (!scroll_position) {
1142 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1143 return;
1144 }
1145 scroll_position--;
1146 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1147 rbe_lines = NUM_LINES(rbe->len);
1148 wscrl(bot.win, rbe_lines);
1149 wmove(bot.win, bot.lines - rbe_lines, 0);
1150 wattron(bot.win, COLOR_PAIR(rbe->color));
1151 waddstr(bot.win, rbe->msg);
1152 wrefresh(bot.win);
1153 print_scroll_msg();
1154 }
1155
1156 static void com_scroll_up(void)
1157 {
1158 struct rb_entry *rbe = NULL;
1159 unsigned lines;
1160 int i, first_rbe, num_scroll;
1161
1162 /* the entry that is going to vanish */
1163 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1164 if (!rbe)
1165 goto err_out;
1166 num_scroll = NUM_LINES(rbe->len);
1167 first_rbe = first_visible_rbe(&lines);
1168 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1169 goto err_out;
1170 scroll_position++;
1171 wscrl(bot.win, -num_scroll);
1172 i = draw_top_rbe(&lines);
1173 if (i < 0)
1174 goto err_out;
1175 while (i > 0 && lines < num_scroll) {
1176 int rbe_lines;
1177 rbe = ringbuffer_get(bot_win_rb, --i);
1178 if (!rbe)
1179 break;
1180 rbe_lines = NUM_LINES(rbe->len);
1181 lines += rbe_lines;
1182 // fprintf(stderr, "msg: %s\n", rbe->msg);
1183 wattron(bot.win, COLOR_PAIR(rbe->color));
1184 waddstr(bot.win, "\n");
1185 waddstr(bot.win, rbe->msg);
1186 if (!i)
1187 break;
1188 i--;
1189 }
1190 wrefresh(bot.win);
1191 print_scroll_msg();
1192 return;
1193 err_out:
1194 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1195 }
1196
1197 static void com_ll_decr(void)
1198 {
1199 if (loglevel <= LL_DEBUG) {
1200 print_in_bar(COLOR_ERRMSG,
1201 "loglevel already at maximal verbosity\n");
1202 return;
1203 }
1204 loglevel--;
1205 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1206 }
1207
1208 static void com_ll_incr(void)
1209 {
1210 if (loglevel >= LL_EMERG) {
1211 print_in_bar(COLOR_ERRMSG,
1212 "loglevel already at minimal verbosity\n");
1213 return;
1214 }
1215 loglevel++;
1216 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1217 }
1218
1219 /*
1220 * reread configuration, terminate on errors
1221 */
1222 static void com_reread_conf(void)
1223 {
1224 char *cf =configfile_exists();
1225 struct gui_cmdline_parser_params params = {
1226 .override = 1,
1227 .initialize = 1,
1228 .check_required = 0,
1229 .check_ambiguity = 0
1230 };
1231
1232 if (!cf) {
1233 PARA_WARNING_LOG("there is no configuration to read");
1234 return;
1235 }
1236 PARA_INFO_LOG("rereading command line options and config file");
1237 gui_cmdline_parser(_argc, _argv, &conf);
1238 gui_cmdline_parser_config_file(cf, &conf, &params);
1239 PARA_NOTICE_LOG("config file reloaded");
1240 if (check_key_map_args() < 0)
1241 finish(EXIT_FAILURE);
1242 }
1243
1244 static void com_help(void)
1245 {
1246 int i;
1247
1248 for (i = 0; i < conf.key_map_given; ++i) {
1249 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1250 const char *handler_text = "???", *desc = NULL;
1251
1252 if (!split_key_map(tmp, &handler, &arg)) {
1253 free(tmp);
1254 return;
1255 }
1256 switch (*handler) {
1257 case 'i':
1258 handler_text = "internal";
1259 desc = command_list[find_cmd_byname(arg)].description;
1260 break;
1261 case 'x': handler_text = "external"; break;
1262 case 'd': handler_text = "display "; break;
1263 case 'p': handler_text = "para "; break;
1264 }
1265 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1266 strlen(arg) < 8? "\t" : "",
1267 desc? desc : "");
1268 free(tmp);
1269 }
1270 for (i = 0; command_list[i].handler; i++) {
1271 struct gui_command gc = command_list[i];
1272
1273 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1274 strlen(gc.name) < 8? "\t" : "",
1275 gc.description);
1276 }
1277 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1278 "for more info");
1279 }
1280
1281 static void com_shrink_top_win(void)
1282 {
1283 if (top.lines <= theme.top_lines_min) {
1284 PARA_WARNING_LOG("can not decrease top window");
1285 return;
1286 }
1287 init_wins(top.lines - 1);
1288 wclear(top.win);
1289 print_all_items();
1290 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1291 }
1292
1293 static void com_enlarge_top_win(void)
1294 {
1295 if (bot.lines < 3) {
1296 PARA_WARNING_LOG("can not increase top window");
1297 return;
1298 }
1299 init_wins(top.lines + 1);
1300 wclear(top.win);
1301 print_all_items();
1302 print_in_bar(COLOR_MSG, "increased top window");
1303 }
1304
1305 static void com_version(void)
1306 {
1307 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1308 CODENAME "\"");
1309 }
1310
1311 __noreturn static void com_quit(void)
1312 {
1313 finish(0);
1314 }
1315
1316 static void com_refresh(void)
1317 {
1318 shutdown_curses();
1319 init_curses();
1320 }
1321
1322 static void change_theme(int next)
1323 {
1324 if (next)
1325 next_theme(&theme);
1326 else
1327 prev_theme(&theme);
1328 /* This seems to be needed twice, why? */
1329 com_refresh();
1330 com_refresh();
1331 PARA_NOTICE_LOG("new theme: %s", theme.name);
1332 }
1333
1334 static void com_next_theme(void)
1335 {
1336 change_theme(1);
1337 }
1338
1339 static void com_prev_theme(void)
1340 {
1341 change_theme(0);
1342 }
1343
1344
1345 static void handle_command(int c)
1346 {
1347 int i;
1348
1349 /* first check user's key bindings */
1350 for (i = 0; i < conf.key_map_given; ++i) {
1351 char *tmp, *handler, *arg;
1352
1353 tmp = para_strdup(conf.key_map_arg[i]);
1354 if (!split_key_map(tmp, &handler, &arg)) {
1355 free(tmp);
1356 return;
1357 }
1358 if (strcmp(tmp, km_keyname(c))) {
1359 free(tmp);
1360 continue;
1361 }
1362 if (*handler == 'd')
1363 display_cmd(arg);
1364 else if (*handler == 'x')
1365 external_cmd(arg);
1366 else if (*handler == 'p')
1367 client_cmd_cmdline(arg);
1368 else if (*handler == 'i') {
1369 int num = find_cmd_byname(arg);
1370 if (num >= 0)
1371 command_list[num].handler();
1372 }
1373 free(tmp);
1374 return;
1375 }
1376 /* not found, check internal key bindings */
1377 for (i = 0; command_list[i].handler; i++) {
1378 if (!strcmp(km_keyname(c), command_list[i].key)) {
1379 command_list[i].handler();
1380 return;
1381 }
1382 }
1383 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1384 km_keyname(c));
1385 }
1386
1387 int main(int argc, char *argv[])
1388 {
1389 int ret;
1390 char *cf;
1391
1392 _argc = argc;
1393 _argv = argv;
1394
1395 if (gui_cmdline_parser(argc, argv, &conf)) {
1396 fprintf(stderr, "parse error while reading command line\n");
1397 exit(EXIT_FAILURE);
1398 }
1399 HANDLE_VERSION_FLAG("gui", conf);
1400 init_theme(0, &theme);
1401 top.lines = theme.top_lines_default;
1402 if (check_key_map_args() < 0) {
1403 fprintf(stderr, "invalid key map\n");
1404 exit(EXIT_FAILURE);
1405 }
1406 cf = configfile_exists();
1407 if (!cf && conf.config_file_given) {
1408 fprintf(stderr, "can not read config file %s\n",
1409 conf.config_file_arg);
1410 exit(EXIT_FAILURE);
1411 }
1412 if (cf) {
1413 struct gui_cmdline_parser_params params = {
1414 .override = 0,
1415 .initialize = 0,
1416 .check_required = 0,
1417 .check_ambiguity = 0
1418 };
1419 gui_cmdline_parser_config_file(cf, &conf, &params);
1420 }
1421 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1422 if (check_key_map_args() < 0) {
1423 fprintf(stderr, "invalid key map in config file\n");
1424 exit(EXIT_FAILURE);
1425 }
1426 setup_signal_handling();
1427 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1428 initscr(); /* needed only once, always successful */
1429 init_curses();
1430 print_welcome();
1431 for (;;) {
1432 print_status_bar();
1433 ret = do_select(GETCH_MODE);
1434 if (!ret)
1435 continue;
1436 print_in_bar(COLOR_MSG, " ");
1437 handle_command(ret);
1438 }
1439 }