Merge commit 'fml/master' into next
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2009 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 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 int _argc;
95 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 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; 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 free(stat_content[item_num]);
683 stat_content[item_num] = para_strdup(buf);
684 print_stat_item(item_num);
685 return 1;
686 }
687
688 static int read_audiod_pipe(int fd)
689 {
690 static char *buf;
691 static int bufsize, loaded;
692 int ret;
693
694 if (loaded >= bufsize) {
695 if (bufsize > 1000 * 1000) {
696 loaded = 0;
697 return 0;
698 }
699 bufsize += bufsize + 1000;
700 buf = para_realloc(buf, bufsize);
701 }
702 assert(loaded < bufsize);
703 ret = read(fd, buf + loaded, bufsize - loaded);
704 if (ret <= 0)
705 return ret;
706 loaded += ret;
707 ret = for_each_stat_item(buf, loaded, update_item);
708 if (ret < 0)
709 return ret;
710 loaded = ret;
711 return 1;
712 }
713
714 static void print_all_items(void)
715 {
716 int i;
717
718 if (!curses_active)
719 return;
720 FOR_EACH_STATUS_ITEM(i)
721 print_stat_item(i);
722 }
723
724 static void clear_all_items(void)
725 {
726 int i;
727
728 FOR_EACH_STATUS_ITEM(i) {
729 free(stat_content[i]);
730 stat_content[i] = para_strdup("");
731 }
732 }
733
734 static void init_colors(void)
735 {
736 int i;
737
738 if (!has_colors())
739 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
740 start_color();
741 FOR_EACH_STATUS_ITEM(i)
742 if (theme.data[i].len)
743 init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
744 init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
745 init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
746 init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
747 init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
748 init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
749 init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
750 init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
751 init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
752 init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
753 }
754
755 /*
756 * (re-)initialize the curses library FIXME: Error checking
757 */
758 static void init_curses(void)
759 {
760 curses_active = 1;
761 if (top.win && refresh() == ERR) { /* refesh is really needed */
762 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
763 }
764 check_geometry();
765 curs_set(0); /* make cursor invisible, ignore errors */
766 // if (noraw() == ERR);
767 // msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
768 // "raw mode\n");
769 nonl(); /* tell curses not to do NL->CR/NL on output */
770 noecho(); /* don't echo input */
771 cbreak(); /* take input chars one at a time, no wait for \n */
772 //reset_prog_mode();
773 init_colors();
774 clear();
775 init_wins(theme.top_lines_default);
776 print_all_items();
777 noecho(); /* don't echo input */
778 }
779
780
781 static void check_sigchld(void)
782 {
783 int ret;
784 pid_t pid;
785 reap_next_child:
786 ret = para_reap_child(&pid);
787 if (ret <= 0)
788 return;
789 if (pid == cmd_pid) {
790 cmd_pid = 0;
791 cmd_died = 1;
792 }
793 goto reap_next_child;
794 }
795
796 /*
797 * This sucker modifies its first argument. *handler and *arg are
798 * pointers to 0-terminated strings (inside line). Crap.
799 */
800 static int split_key_map(char *line, char **handler, char **arg)
801 {
802 if (!(*handler = strchr(line + 1, ':')))
803 goto err_out;
804 **handler = '\0';
805 (*handler)++;
806 if (!(*arg = strchr(*handler, ':')))
807 goto err_out;
808 **arg = '\0';
809 (*arg)++;
810 return 1;
811 err_out:
812 return 0;
813 }
814
815 static int check_key_map_args(void)
816 {
817 char *s;
818 int i, ret = -1;
819 char *tmp = NULL, *handler, *arg;
820
821 for (i = 0; i < conf.key_map_given; ++i) {
822 s = conf.key_map_arg[i];
823 if (!(*s))
824 goto err_out;
825 free(tmp);
826 tmp = para_strdup(s);
827 if (!split_key_map(tmp, &handler, &arg))
828 goto err_out;
829 if (strlen(handler) != 1)
830 goto err_out;
831 if (*handler != 'x'
832 && *handler != 'd'
833 && *handler != 'i'
834 && *handler != 'p')
835 goto err_out;
836 if (*handler != 'i')
837 continue;
838 if (find_cmd_byname(arg) < 0)
839 goto err_out;
840 }
841 ret = 0;
842 err_out:
843 free(tmp);
844 return ret;
845 }
846
847 /*
848 * React to various signal-related events
849 */
850 static void handle_signal(int sig)
851 {
852 switch (sig) {
853 case SIGTERM:
854 msg_n_exit(EXIT_FAILURE,
855 "only the good die young (caught SIGTERM))\n");
856 return;
857 case SIGWINCH:
858 if (curses_active) {
859 shutdown_curses();
860 init_curses();
861 redraw_bot_win();
862 }
863 return;
864 case SIGINT:
865 PARA_WARNING_LOG("caught SIGINT, reset");
866 /* Nothing to do. SIGINT killed our child which gets noticed
867 * by do_select and resets everything.
868 */
869 return;
870 case SIGUSR1:
871 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
872 com_reread_conf();
873 return;
874 case SIGCHLD:
875 check_sigchld();
876 return;
877 }
878 }
879
880 static int open_audiod_pipe(void)
881 {
882 static int init = 1;
883
884 if (init)
885 init = 0;
886 else
887 sleep(1);
888 return para_open_audiod_pipe(conf.stat_cmd_arg);
889 }
890
891 /*
892 * This is the core select loop. Besides the (internal) signal
893 * pipe, the following other fds are checked according to the mode:
894 *
895 * GETCH_MODE: check stdin, return when key is pressed
896 *
897 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
898 * of output has been read or when other end has closed command pipe or
899 * when any key is pressed.
900 *
901 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
902 * is running. During that time curses is disabled. Returns when
903 * cmd_pid == 0.
904 */
905 static int do_select(int mode)
906 {
907 fd_set rfds;
908 int ret;
909 int max_fileno, cp_numread = 1;
910 char command_buf[4096] = "";
911 int cbo = 0; /* command buf offset */
912 struct timeval tv;
913 repeat:
914 tv.tv_sec = conf.timeout_arg / 1000;
915 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
916 // ret = refresh_status();
917 FD_ZERO(&rfds);
918 max_fileno = 0;
919 /* audiod pipe */
920 if (audiod_pipe < 0)
921 audiod_pipe = open_audiod_pipe();
922 if (audiod_pipe >= 0)
923 para_fd_set(audiod_pipe, &rfds, &max_fileno);
924 /* signal pipe */
925 para_fd_set(signal_pipe, &rfds, &max_fileno);
926 /* command pipe only for COMMAND_MODE */
927 if (command_pipe >= 0 && mode == COMMAND_MODE)
928 para_fd_set(command_pipe, &rfds, &max_fileno);
929 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
930 if (ret <= 0)
931 goto check_return; /* skip fd checks */
932 /* signals */
933 if (FD_ISSET(signal_pipe, &rfds)) {
934 int sig_nr = para_next_signal();
935 if (sig_nr > 0)
936 handle_signal(sig_nr);
937 }
938 /* read command pipe if ready */
939 if (command_pipe >= 0 && mode == COMMAND_MODE &&
940 FD_ISSET(command_pipe, &rfds)) {
941 cp_numread = read(command_pipe, command_buf + cbo,
942 sizeof(command_buf) - 1 - cbo);
943 if (cp_numread >= 0)
944 cbo += cp_numread;
945 else {
946 if (cp_numread < 0)
947 PARA_ERROR_LOG("read error (%d)", cp_numread);
948 close(command_pipe);
949 command_pipe = -1;
950 }
951 }
952 if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
953 if (read_audiod_pipe(audiod_pipe) <= 0) {
954 close(audiod_pipe);
955 audiod_pipe = -1;
956 clear_all_items();
957 free(stat_content[SI_BASENAME]);
958 stat_content[SI_BASENAME] =
959 para_strdup("audiod not running!?");
960 print_all_items();
961 }
962 check_return:
963 switch (mode) {
964 case COMMAND_MODE:
965 if (cp_numread <= 0 && !cbo) /* command complete */
966 return 0;
967 if (cbo)
968 cbo = for_each_line(command_buf, cbo,
969 &add_output_line, NULL);
970 if (cp_numread <= 0)
971 cbo = 0;
972 wrefresh(bot.win);
973 ret = wgetch(top.win);
974 if (ret != ERR && ret != KEY_RESIZE) {
975 if (command_pipe) {
976 close(command_pipe);
977 command_pipe = -1;
978 }
979 if (cmd_pid)
980 kill(cmd_pid, SIGTERM);
981 return -1;
982 }
983 break;
984 case GETCH_MODE:
985 ret = wgetch(top.win);
986 if (ret != ERR && ret != KEY_RESIZE)
987 return ret;
988 break;
989 case EXTERNAL_MODE:
990 if (cmd_died) {
991 cmd_died = 0;
992 return 0;
993 }
994 }
995 goto repeat;
996 }
997
998 /*
999 * read from command pipe and print data to bot window
1000 */
1001 static int send_output(void)
1002 {
1003 int ret;
1004
1005 if (command_pipe < 0)
1006 return 0;
1007 ret = mark_fd_nonblocking(command_pipe);
1008 if (ret < 0) {
1009 close(command_pipe);
1010 return ret;
1011 }
1012 if (do_select(COMMAND_MODE) >= 0)
1013 PARA_INFO_LOG("command complete");
1014 else
1015 PARA_NOTICE_LOG("command aborted");
1016 print_in_bar(COLOR_MSG, " ");
1017 return 1;
1018 }
1019
1020 static int client_cmd_cmdline(char *cmd)
1021 {
1022 int ret, fds[3] = {0, 1, 0};
1023 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1024
1025 outputf(COLOR_COMMAND, "%s", c);
1026 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1027 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1028 free(c);
1029 if (ret < 0)
1030 return -1;
1031 command_pipe = fds[1];
1032 return send_output();
1033 }
1034
1035 /*
1036 * exec command and print output to bot win
1037 */
1038 static int display_cmd(char *cmd)
1039 {
1040 int fds[3] = {0, 1, 0};
1041
1042 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1043 outputf(COLOR_COMMAND, "%s", cmd);
1044 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1045 return -1;
1046 command_pipe = fds[1];
1047 return send_output();
1048 }
1049
1050 /*
1051 * shutdown curses and stat pipe before executing external commands
1052 */
1053 static int external_cmd(char *cmd)
1054 {
1055 int fds[3] = {-1, -1, -1};
1056
1057 if (cmd_pid)
1058 return -1;
1059 shutdown_curses();
1060 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1061 cmd_died = 0;
1062 do_select(EXTERNAL_MODE);
1063 init_curses();
1064 return 0;
1065 }
1066
1067 static void print_scroll_msg(void)
1068 {
1069 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1070 int first_rbe = first_visible_rbe(&lines_total);
1071 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1072 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1073 }
1074
1075 static void com_page_down(void)
1076 {
1077 unsigned lines = 0;
1078 int i = scroll_position;
1079 while (lines < bot.lines && --i > 0) {
1080 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1081 if (!rbe)
1082 break;
1083 lines += NUM_LINES(strlen(rbe->msg));
1084 }
1085 if (lines) {
1086 scroll_position = i;
1087 redraw_bot_win();
1088 print_scroll_msg();
1089 return;
1090 }
1091 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1092 }
1093
1094 static void com_page_up(void)
1095 {
1096 unsigned lines;
1097 int fvr = first_visible_rbe(&lines);
1098
1099 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1100 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1101 return;
1102 }
1103 scroll_position = fvr + 1;
1104 for (; scroll_position > 0; scroll_position--) {
1105 first_visible_rbe(&lines);
1106 if (lines == bot.lines)
1107 break;
1108 }
1109 redraw_bot_win();
1110 print_scroll_msg();
1111 }
1112
1113 static void com_scroll_down(void)
1114 {
1115 struct rb_entry *rbe;
1116 int rbe_lines;
1117
1118 if (!scroll_position) {
1119 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1120 return;
1121 }
1122 scroll_position--;
1123 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1124 rbe_lines = NUM_LINES(rbe->len);
1125 wscrl(bot.win, rbe_lines);
1126 wmove(bot.win, bot.lines - rbe_lines, 0);
1127 wattron(bot.win, COLOR_PAIR(rbe->color));
1128 waddstr(bot.win, rbe->msg);
1129 wrefresh(bot.win);
1130 print_scroll_msg();
1131 }
1132
1133 static void com_scroll_up(void)
1134 {
1135 struct rb_entry *rbe = NULL;
1136 unsigned lines;
1137 int i, first_rbe, num_scroll;
1138
1139 /* the entry that is going to vanish */
1140 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1141 if (!rbe)
1142 goto err_out;
1143 num_scroll = NUM_LINES(rbe->len);
1144 first_rbe = first_visible_rbe(&lines);
1145 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1146 goto err_out;
1147 scroll_position++;
1148 wscrl(bot.win, -num_scroll);
1149 i = draw_top_rbe(&lines);
1150 if (i < 0)
1151 goto err_out;
1152 while (i > 0 && lines < num_scroll) {
1153 int rbe_lines;
1154 rbe = ringbuffer_get(bot_win_rb, --i);
1155 if (!rbe)
1156 break;
1157 rbe_lines = NUM_LINES(rbe->len);
1158 lines += rbe_lines;
1159 // fprintf(stderr, "msg: %s\n", rbe->msg);
1160 wattron(bot.win, COLOR_PAIR(rbe->color));
1161 waddstr(bot.win, "\n");
1162 waddstr(bot.win, rbe->msg);
1163 if (!i)
1164 break;
1165 i--;
1166 }
1167 wrefresh(bot.win);
1168 print_scroll_msg();
1169 return;
1170 err_out:
1171 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1172 }
1173
1174 static void com_ll_decr(void)
1175 {
1176 if (loglevel <= LL_DEBUG) {
1177 print_in_bar(COLOR_ERRMSG,
1178 "loglevel already at maximal verbosity\n");
1179 return;
1180 }
1181 loglevel--;
1182 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1183 }
1184
1185 static void com_ll_incr(void)
1186 {
1187 if (loglevel >= LL_EMERG) {
1188 print_in_bar(COLOR_ERRMSG,
1189 "loglevel already at minimal verbosity\n");
1190 return;
1191 }
1192 loglevel++;
1193 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1194 }
1195
1196 /*
1197 * reread configuration, terminate on errors
1198 */
1199 static void com_reread_conf(void)
1200 {
1201 char *cf =configfile_exists();
1202 struct gui_cmdline_parser_params params = {
1203 .override = 1,
1204 .initialize = 1,
1205 .check_required = 0,
1206 .check_ambiguity = 0
1207 };
1208
1209 if (!cf) {
1210 PARA_WARNING_LOG("there is no configuration to read");
1211 return;
1212 }
1213 PARA_INFO_LOG("rereading command line options and config file");
1214 gui_cmdline_parser(_argc, _argv, &conf);
1215 gui_cmdline_parser_config_file(cf, &conf, &params);
1216 PARA_NOTICE_LOG("config file reloaded");
1217 if (check_key_map_args() < 0)
1218 finish(EXIT_FAILURE);
1219 }
1220
1221 static void com_help(void)
1222 {
1223 int i;
1224
1225 for (i = 0; i < conf.key_map_given; ++i) {
1226 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1227 const char *handler_text = "???", *desc = NULL;
1228
1229 if (!split_key_map(tmp, &handler, &arg)) {
1230 free(tmp);
1231 return;
1232 }
1233 switch (*handler) {
1234 case 'i':
1235 handler_text = "internal";
1236 desc = command_list[find_cmd_byname(arg)].description;
1237 break;
1238 case 'x': handler_text = "external"; break;
1239 case 'd': handler_text = "display "; break;
1240 case 'p': handler_text = "para "; break;
1241 }
1242 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1243 strlen(arg) < 8? "\t" : "",
1244 desc? desc : "");
1245 free(tmp);
1246 }
1247 for (i = 0; command_list[i].handler; i++) {
1248 struct gui_command gc = command_list[i];
1249
1250 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1251 strlen(gc.name) < 8? "\t" : "",
1252 gc.description);
1253 }
1254 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1255 "for more info");
1256 }
1257
1258 static void com_shrink_top_win(void)
1259 {
1260 if (top.lines <= theme.top_lines_min) {
1261 PARA_WARNING_LOG("can not decrease top window");
1262 return;
1263 }
1264 init_wins(top.lines - 1);
1265 wclear(top.win);
1266 print_all_items();
1267 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1268 }
1269
1270 static void com_enlarge_top_win(void)
1271 {
1272 if (bot.lines < 3) {
1273 PARA_WARNING_LOG("can not increase top window");
1274 return;
1275 }
1276 init_wins(top.lines + 1);
1277 wclear(top.win);
1278 print_all_items();
1279 print_in_bar(COLOR_MSG, "increased top window");
1280 }
1281
1282 static void com_version(void)
1283 {
1284 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1285 CODENAME "\"");
1286 }
1287
1288 __noreturn static void com_quit(void)
1289 {
1290 finish(0);
1291 }
1292
1293 static void com_refresh(void)
1294 {
1295 shutdown_curses();
1296 init_curses();
1297 }
1298
1299 static void change_theme(int next)
1300 {
1301 if (next)
1302 next_theme(&theme);
1303 else
1304 prev_theme(&theme);
1305 /* This seems to be needed twice, why? */
1306 com_refresh();
1307 com_refresh();
1308 PARA_NOTICE_LOG("new theme: %s", theme.name);
1309 }
1310
1311 static void com_next_theme(void)
1312 {
1313 change_theme(1);
1314 }
1315
1316 static void com_prev_theme(void)
1317 {
1318 change_theme(0);
1319 }
1320
1321
1322 static void handle_command(int c)
1323 {
1324 int i;
1325
1326 /* first check user's key bindings */
1327 for (i = 0; i < conf.key_map_given; ++i) {
1328 char tmp[MAXLINE], *handler, *arg;
1329
1330 strcpy(tmp, conf.key_map_arg[i]);
1331 if (!split_key_map(tmp, &handler, &arg))
1332 return;
1333 if (!strcmp(tmp, km_keyname(c))) {
1334 if (*handler == 'd') {
1335 display_cmd(arg);
1336 return;
1337 }
1338 if (*handler == 'x') {
1339 external_cmd(arg);
1340 return;
1341 }
1342 if (*handler == 'p') {
1343 client_cmd_cmdline(arg);
1344 return;
1345 }
1346 if (*handler == 'i') {
1347 int num = find_cmd_byname(arg);
1348 if (num >= 0)
1349 command_list[num].handler();
1350 return;
1351 }
1352 }
1353 }
1354 /* not found, check internal key bindings */
1355 for (i = 0; command_list[i].handler; i++) {
1356 if (!strcmp(km_keyname(c), command_list[i].key)) {
1357 command_list[i].handler();
1358 return;
1359 }
1360 }
1361 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1362 km_keyname(c));
1363 }
1364
1365 int main(int argc, char *argv[])
1366 {
1367 int ret;
1368 char *cf;
1369
1370 _argc = argc;
1371 _argv = argv;
1372
1373 if (gui_cmdline_parser(argc, argv, &conf)) {
1374 fprintf(stderr, "parse error while reading command line\n");
1375 exit(EXIT_FAILURE);
1376 }
1377 HANDLE_VERSION_FLAG("gui", conf);
1378 init_theme(0, &theme);
1379 top.lines = theme.top_lines_default;
1380 if (check_key_map_args() < 0) {
1381 fprintf(stderr, "invalid key map\n");
1382 exit(EXIT_FAILURE);
1383 }
1384 cf = configfile_exists();
1385 if (!cf && conf.config_file_given) {
1386 fprintf(stderr, "can not read config file %s\n",
1387 conf.config_file_arg);
1388 exit(EXIT_FAILURE);
1389 }
1390 if (cf) {
1391 struct gui_cmdline_parser_params params = {
1392 .override = 0,
1393 .initialize = 0,
1394 .check_required = 0,
1395 .check_ambiguity = 0
1396 };
1397 gui_cmdline_parser_config_file(cf, &conf, &params);
1398 }
1399 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1400 if (check_key_map_args() < 0) {
1401 fprintf(stderr, "invalid key map in config file\n");
1402 exit(EXIT_FAILURE);
1403 }
1404 setup_signal_handling();
1405 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1406 initscr(); /* needed only once, always successful */
1407 init_curses();
1408 print_welcome();
1409 for (;;) {
1410 print_status_bar();
1411 ret = do_select(GETCH_MODE);
1412 if (!ret)
1413 continue;
1414 print_in_bar(COLOR_MSG, " ");
1415 handle_command(ret);
1416 }
1417 }