4862df5ed9595459e8beed9cfa76946f71c54f9d
[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 <signal.h>
10 #include <sys/types.h>
11 #include <dirent.h>
12 #include "gui.cmdline.h"
13 #include "para.h"
14 #include "gui.h"
15 #include "string.h"
16 #include <curses.h>
17 #include "ringbuffer.h"
18 #include "fd.h"
19 #include "error.h"
20 #include "list.h"
21 #include "sched.h"
22 #include "signal.h"
23
24 /** define the array of error lists needed by para_gui */
25 INIT_GUI_ERRLISTS;
26 static char *stat_content[NUM_STAT_ITEMS];
27
28 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
29
30 static int signal_pipe;
31
32 static struct win_data {
33 WINDOW *win;
34 NCURSES_SIZE_T begx;
35 NCURSES_SIZE_T begy;
36 NCURSES_SIZE_T cols;
37 NCURSES_SIZE_T lines;
38 } top, bot, sb, in, sep;
39
40 #define RINGBUFFER_SIZE 512
41 struct rb_entry {
42 char *msg;
43 size_t len;
44 int color;
45 };
46 struct ringbuffer *bot_win_rb;
47 #define NUM_LINES(len) (1 + (len) / bot.cols)
48
49 static unsigned scroll_position;
50
51 static int cmd_died, curses_active;
52 static pid_t cmd_pid;
53
54 static int command_pipe = -1;
55 static int audiod_pipe = -1;
56 static struct gui_args_info conf;
57
58 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
59
60
61 #define COLOR_STATUSBAR 52
62 #define COLOR_COMMAND 53
63 #define COLOR_OUTPUT 54
64 #define COLOR_MSG 55
65 #define COLOR_ERRMSG 56
66 #define COLOR_WELCOME 57
67 #define COLOR_SEPARATOR 58
68 #define COLOR_TOP 59
69 #define COLOR_BOT 60
70
71 struct gui_command {
72 const char *key;
73 const char *name;
74 const char *description;
75 void (*handler)(void);
76 };
77
78 struct stat_item {
79 char name[MAXLINE];
80 char prefix[MAXLINE];
81 char postfix[MAXLINE];
82 unsigned y;
83 unsigned x;
84 unsigned len;
85 int fg, bg;
86 int align;
87 char content[MAXLINE];
88 };
89
90 static struct gui_theme theme;
91
92 int _argc;
93 char **_argv;
94
95 static void com_help(void);
96 static void com_reread_conf(void);
97 static void com_enlarge_top_win(void);
98 static void com_shrink_top_win(void);
99 static void com_version(void);
100 static void com_quit(void);
101 static void com_refresh(void);
102 static void com_ll_incr(void);
103 static void com_ll_decr(void);
104 static void com_prev_theme(void);
105 static void com_next_theme(void);
106 static void com_scroll_up(void);
107 static void com_scroll_down(void);
108 static void com_page_up(void);
109 static void com_page_down(void);
110
111 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 .handler = NULL
189 }
190 };
191
192 static int para_open_audiod_pipe(char *cmd)
193 {
194 int fds[3] = {0, 1, 0};
195 pid_t pid;
196 int ret = para_exec_cmdline_pid(&pid, cmd, fds);
197 if (ret < 0)
198 return ret;
199 ret = mark_fd_nonblocking(fds[1]);
200 if (ret > 0)
201 return fds[1];
202 close(fds[1]);
203 return ret;
204 }
205
206 static int read_audiod_pipe(int fd, line_handler_t *line_handler)
207 {
208 static char buf[4096];
209 const ssize_t bufsize = sizeof(buf) - 1;
210 static ssize_t loaded;
211 ssize_t ret;
212
213 if (loaded >= bufsize)
214 loaded = 0;
215 ret = read(fd, buf + loaded, bufsize - loaded);
216 if (ret > 0) {
217 loaded += ret;
218 buf[loaded] = '\0';
219 loaded = for_each_line(buf, loaded, line_handler, NULL);
220 }
221 return ret;
222 }
223
224 static int find_cmd_byname(char *name)
225 {
226 int i;
227
228 for (i = 0; command_list[i].handler; i++)
229 if (!strcmp(command_list[i].name, name))
230 return i;
231 return -1;
232 }
233
234 /* taken from mutt */
235 static char *km_keyname(int c)
236 {
237 static char buf[10];
238
239 if (c == KEY_UP) {
240 sprintf(buf, "<up>");
241 return buf;
242 }
243 if (c == KEY_DOWN) {
244 sprintf(buf, "<down>");
245 return buf;
246 }
247 if (c == KEY_LEFT) {
248 sprintf(buf, "<left>");
249 return buf;
250 }
251 if (c == KEY_RIGHT) {
252 sprintf(buf, "<right>");
253 return buf;
254 }
255 if (c == KEY_NPAGE) {
256 sprintf(buf, "<npage>");
257 return buf;
258 }
259 if (c == KEY_PPAGE) {
260 sprintf(buf, "<ppage>");
261 return buf;
262 }
263 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
264 if (c < 0)
265 c += 256;
266 if (c < 128) {
267 buf[0] = '^';
268 buf[1] = (c + '@') & 0x7f;
269 buf[2] = 0;
270 } else
271 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
272 (c >> 3) & 7, c & 7);
273 } else if (c >= KEY_F0 && c < KEY_F(256))
274 sprintf(buf, "<F%d>", c - KEY_F0);
275 else if (isprint(c))
276 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
277 else
278 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
279 return buf;
280 }
281
282 static char *configfile_exists(void)
283 {
284 static char *config_file;
285 char *tmp;
286
287 if (!conf.config_file_given) {
288 if (!config_file) {
289 char *home = para_homedir();
290 config_file = make_message("%s/.paraslash/gui.conf",
291 home);
292 free(home);
293 }
294 tmp = config_file;
295 } else
296 tmp = conf.config_file_arg;
297 return file_exists(tmp)? tmp: NULL;
298 }
299
300 /*
301 * print num spaces to curses window
302 */
303 static void add_spaces(WINDOW* win, unsigned int num)
304 {
305 while (num > 0) {
306 num--;
307 waddstr(win, " ");
308 }
309 }
310
311 /*
312 * print aligned string to curses window. This function always prints
313 * exactly len chars.
314 */
315 static int align_str(WINDOW* win, const char *string, unsigned int len,
316 unsigned int align)
317 {
318 int num; /* of spaces */
319 char *str;
320
321 if (!win || !string)
322 return -1;
323 num = len - strlen(string);
324 str = para_strdup(string);
325 if (num < 0) {
326 str[len] = '\0';
327 num = 0;
328 }
329 if (align == LEFT) {
330 waddstr(win, str);
331 add_spaces(win, num);
332 } else if (align == RIGHT) {
333 add_spaces(win, num);
334 waddstr(win, str);
335 } else {
336 add_spaces(win, num / 2);
337 waddstr(win, str[0]? str: "");
338 add_spaces(win, num - num / 2);
339 }
340 free(str);
341 return 1;
342 }
343
344 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
345 {
346 char *msg;
347
348 if (!curses_active)
349 return;
350 wattron(in.win, COLOR_PAIR(color));
351 PARA_VSPRINTF(fmt, msg);
352 wmove(in.win, 0, 0);
353 align_str(in.win, msg, sb.cols, LEFT);
354 free(msg);
355 wrefresh(in.win);
356 }
357
358 /*
359 * update the status bar
360 */
361 static void print_status_bar(void)
362 {
363 if (!curses_active)
364 return;
365 wmove(sb.win, 0, 0);
366 align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
367 wrefresh(sb.win);
368 }
369
370 /*
371 * get the number of the oldest rbe that is (partially) visible. On return,
372 * lines contains the sum of the number of lines of all visable entries. If the
373 * first one is only partially visible, lines is greater than bot.lines.
374 */
375 static int first_visible_rbe(unsigned *lines)
376 {
377 int i;
378 *lines = 0;
379 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
380 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
381 int rbe_lines;
382 if (!rbe)
383 return i - 1;
384 // fprintf(stderr, "found: %s\n", rbe->msg);
385 rbe_lines = NUM_LINES(rbe->len);
386 if (rbe_lines > bot.lines)
387 return -1;
388 *lines += rbe_lines;
389 if (*lines >= bot.lines)
390 return i;
391 }
392 return RINGBUFFER_SIZE - 1;
393 }
394
395 static int draw_top_rbe(unsigned *lines)
396 {
397 unsigned len;
398 int offset, fvr = first_visible_rbe(lines);
399 struct rb_entry *rbe;
400
401 if (fvr < 0)
402 return -1;
403 wmove(bot.win, 0, 0);
404 rbe = ringbuffer_get(bot_win_rb, fvr);
405 if (!rbe)
406 return -1;
407 /* first rbe might be only partially visible */
408 offset = (*lines - bot.lines) * bot.cols;
409 len = strlen(rbe->msg);
410 if (offset < 0 || len < offset)
411 return -1;
412 wattron(bot.win, COLOR_PAIR(rbe->color));
413 waddstr(bot.win, rbe->msg + offset);
414 *lines = NUM_LINES(len - offset);
415 return fvr;
416 }
417
418 static void redraw_bot_win(void)
419 {
420 unsigned lines;
421 int i;
422
423 wmove(bot.win, 0, 0);
424 wclear(bot.win);
425 i = draw_top_rbe(&lines);
426 if (i <= 0)
427 goto out;
428 while (i > 0 && lines < bot.lines) {
429 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
430 if (!rbe) {
431 lines++;
432 waddstr(bot.win, "\n");
433 continue;
434 }
435 lines += NUM_LINES(rbe->len);
436 wattron(bot.win, COLOR_PAIR(rbe->color));
437 waddstr(bot.win, "\n");
438 waddstr(bot.win, rbe->msg);
439 }
440 out:
441 wrefresh(bot.win);
442 }
443
444 static void rb_add_entry(int color, char *msg)
445 {
446 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
447 int x, y;
448 new->color = color;
449 new->len = strlen(msg);
450 new->msg = msg;
451 old = ringbuffer_add(bot_win_rb, new);
452 // fprintf(stderr, "added: %s\n", new->msg);
453 if (old) {
454 free(old->msg);
455 free(old);
456 }
457 if (scroll_position) {
458 /* discard current scrolling, like xterm does */
459 scroll_position = 0;
460 redraw_bot_win();
461 return;
462 }
463 wattron(bot.win, COLOR_PAIR(color));
464 getyx(bot.win, y, x);
465 if (y || x)
466 waddstr(bot.win, "\n");
467 waddstr(bot.win, msg);
468 }
469
470 /*
471 * print formated output to bot win and refresh
472 */
473 __printf_2_3 static void outputf(int color, const char* fmt,...)
474 {
475 char *msg;
476
477 if (!curses_active)
478 return;
479 PARA_VSPRINTF(fmt, msg);
480 rb_add_entry(color, msg);
481 wrefresh(bot.win);
482 }
483
484 static int add_output_line(char *line, __a_unused void *data)
485 {
486 if (!curses_active)
487 return 1;
488 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
489 return 1;
490 }
491
492 static int loglevel;
493
494 __printf_2_3 void para_log(int ll, const char *fmt,...)
495 {
496 int color;
497 char *msg;
498
499 if (ll < loglevel || !curses_active)
500 return;
501 switch (ll) {
502 case LL_DEBUG:
503 case LL_INFO:
504 case LL_NOTICE:
505 color = COLOR_MSG;
506 break;
507 default:
508 color = COLOR_ERRMSG;
509 }
510 PARA_VSPRINTF(fmt, msg);
511 chop(msg);
512 rb_add_entry(color, msg);
513 wrefresh(bot.win);
514 }
515
516 static void setup_signal_handling(void)
517 {
518 signal_pipe = para_signal_init();
519 para_install_sighandler(SIGINT);
520 para_install_sighandler(SIGTERM);
521 para_install_sighandler(SIGCHLD);
522 para_install_sighandler(SIGWINCH);
523 para_install_sighandler(SIGUSR1);
524 // signal(SIGPIPE, SIG_IGN);
525 signal(SIGHUP, SIG_IGN);
526 }
527
528 __noreturn static void do_exit(int ret)
529 {
530 signal(SIGTERM, SIG_IGN);
531 kill(0, SIGTERM);
532 exit(ret);
533 }
534
535 static void shutdown_curses(void)
536 {
537 if (!curses_active)
538 return;
539 def_prog_mode();
540 curses_active = 0;
541 endwin();
542 }
543
544 __noreturn static void finish(int ret)
545 {
546 shutdown_curses();
547 do_exit(ret);
548 }
549
550 /*
551 * exit curses and print given message to stdout/stderr
552 */
553 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
554 {
555 va_list argp;
556 FILE *outfd = ret? stderr: stdout;
557
558 shutdown_curses();
559 va_start(argp, fmt);
560 vfprintf(outfd, fmt, argp);
561 va_end(argp);
562 do_exit(ret);
563 }
564
565 static void print_welcome(void)
566 {
567 if (loglevel > LL_NOTICE)
568 return;
569 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
570 " \"" CODENAME "\". Theme: %s", theme.name);
571 wclrtoeol(bot.win);
572 }
573
574 /*
575 * init all windows
576 */
577 static void init_wins(int top_lines)
578 {
579 int i;
580
581 top.lines = top_lines;
582 top.cols = COLS;
583 top.begy = 0;
584 top.begx = 0;
585
586 bot.lines = LINES - top.lines - 3;
587 bot.cols = COLS;
588 bot.begy = top.lines + 1;
589 bot.begx = 0;
590
591 sb.lines = 1;
592 sb.cols = COLS;
593 sb.begy = LINES - 2;
594 sb.begx = 0;
595
596 in.lines = 1;
597 in.cols = COLS;
598 in.begy = LINES - 1;
599 in.begx = 0;
600
601 sep.lines = 1;
602 sep.cols = COLS;
603 sep.begy = top.lines;
604 sep.begx = 0;
605
606 assume_default_colors(theme.default_fg, theme.default_bg);
607 if (top.win) {
608 mvwin(top.win, top.begy, top.begx);
609 wresize(top.win, top.lines, top.cols);
610
611 mvwin(sb.win, sb.begy, sb.begx);
612 wresize(sb.win, sb.lines, sb.cols);
613
614 mvwin(sep.win, sep.begy, sep.begx);
615 wresize(sep.win, sep.lines, sep.cols);
616
617 mvwin(bot.win, bot.begy, bot.begx);
618 wresize(bot.win, bot.lines, bot.cols);
619
620 mvwin(in.win, in.begy, in.begx);
621 wresize(in.win, in.lines, in.cols);
622 } else {
623 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
624 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
625 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
626 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
627 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
628 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
629 msg_n_exit(1, "Error: Cannot create curses windows\n");
630 wclear(bot.win);
631 wclear(sb.win);
632 wclear(in.win);
633 scrollok(bot.win, 1);
634 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
635 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
636 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
637 wattron(top.win, COLOR_PAIR(COLOR_TOP));
638 nodelay(top.win, 1);
639 nodelay(bot.win, 1);
640 nodelay(sb.win, 1);
641 nodelay(in.win, 0);
642
643 keypad(top.win, 1);
644 keypad(bot.win, 1);
645 keypad(sb.win, 1);
646 keypad(in.win, 1);
647 print_status_bar();
648 }
649 wmove(sep.win, 0, 0);
650 for (i = 1; i <= COLS; i++)
651 waddstr(sep.win, theme.sep_str);
652 wclear(top.win);
653 //wclear(bot.win);
654 wnoutrefresh(top.win);
655 wnoutrefresh(bot.win);
656 //wnoutrefresh(sb.win);
657 print_status_bar();
658 wnoutrefresh(in.win);
659 wnoutrefresh(sep.win);
660 doupdate();
661 }
662
663 static void check_geometry(void)
664 {
665 if (LINES < theme.lines_min || COLS < theme.cols_min)
666 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
667 " (need at least %dx%d)\n", COLS, LINES,
668 theme.cols_min, theme.lines_min);
669 }
670
671 /*
672 * Print stat item #i to curses window
673 */
674 static void print_stat_item(int i)
675 {
676 char *tmp;
677 struct stat_item_data d = theme.data[i];
678 char *c = stat_content[i];
679
680 if (!curses_active || !d.len || !c)
681 return;
682 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
683 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
684 wrefresh(top.win);
685 wattron(top.win, COLOR_PAIR(i + 1));
686 align_str(top.win, tmp, d.len * COLS / 100, d.align);
687 free(tmp);
688 wrefresh(top.win);
689 }
690
691 static void print_all_items(void)
692 {
693 int i;
694
695 if (!curses_active)
696 return;
697 FOR_EACH_STATUS_ITEM(i)
698 print_stat_item(i);
699 }
700
701 static void clear_all_items(void)
702 {
703 int i;
704
705 FOR_EACH_STATUS_ITEM(i) {
706 free(stat_content[i]);
707 stat_content[i] = para_strdup("");
708 }
709 }
710
711 static void init_colors(void)
712 {
713 int i;
714
715 if (!has_colors())
716 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
717 start_color();
718 FOR_EACH_STATUS_ITEM(i)
719 if (theme.data[i].len)
720 init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
721 init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
722 init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
723 init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
724 init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
725 init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
726 init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
727 init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
728 init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
729 init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
730 }
731
732 /*
733 * (re-)initialize the curses library FIXME: Error checking
734 */
735 static void init_curses(void)
736 {
737 curses_active = 1;
738 if (top.win && refresh() == ERR) { /* refesh is really needed */
739 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
740 }
741 check_geometry();
742 curs_set(0); /* make cursor invisible, ignore errors */
743 // if (noraw() == ERR);
744 // msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
745 // "raw mode\n");
746 nonl(); /* tell curses not to do NL->CR/NL on output */
747 noecho(); /* don't echo input */
748 cbreak(); /* take input chars one at a time, no wait for \n */
749 //reset_prog_mode();
750 init_colors();
751 clear();
752 init_wins(theme.top_lines_default);
753 print_all_items();
754 noecho(); /* don't echo input */
755 }
756
757
758 static void check_sigchld(void)
759 {
760 int ret;
761 pid_t pid;
762 reap_next_child:
763 ret = para_reap_child(&pid);
764 if (ret <= 0)
765 return;
766 if (pid == cmd_pid) {
767 cmd_pid = 0;
768 cmd_died = 1;
769 }
770 goto reap_next_child;
771 }
772
773 /*
774 * print status line if line starts with known command.
775 */
776 static int check_stat_line(char *line, __a_unused void *data)
777 {
778 int i;
779
780 // PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
781 i = stat_line_valid(line);
782 if (i >= 0) {
783 line += strlen(status_item_list[i]) + 1;
784 if (*line == ' ')
785 line++;
786 free(stat_content[i]);
787 stat_content[i] = para_strdup(line);
788 print_stat_item(i);
789 }
790 return 1;
791 }
792
793 /*
794 * This sucker modifies its first argument. *handler and *arg are
795 * pointers to 0-terminated strings (inside line). Crap.
796 */
797 static int split_key_map(char *line, char **handler, char **arg)
798 {
799 if (!(*handler = strchr(line + 1, ':')))
800 goto err_out;
801 **handler = '\0';
802 (*handler)++;
803 if (!(*arg = strchr(*handler, ':')))
804 goto err_out;
805 **arg = '\0';
806 (*arg)++;
807 return 1;
808 err_out:
809 return 0;
810 }
811
812 static int check_key_map_args(void)
813 {
814 char *s;
815 int i, ret = -1;
816 char *tmp = NULL, *handler, *arg;
817
818 for (i = 0; i < conf.key_map_given; ++i) {
819 s = conf.key_map_arg[i];
820 if (!(*s))
821 goto err_out;
822 free(tmp);
823 tmp = para_strdup(s);
824 if (!split_key_map(tmp, &handler, &arg))
825 goto err_out;
826 if (strlen(handler) != 1)
827 goto err_out;
828 if (*handler != 'x'
829 && *handler != 'd'
830 && *handler != 'i'
831 && *handler != 'p')
832 goto err_out;
833 if (*handler != 'i')
834 continue;
835 if (find_cmd_byname(arg) < 0)
836 goto err_out;
837 }
838 ret = 0;
839 err_out:
840 free(tmp);
841 return ret;
842 }
843
844 /*
845 * React to various signal-related events
846 */
847 static void handle_signal(int sig)
848 {
849 switch (sig) {
850 case SIGTERM:
851 msg_n_exit(EXIT_FAILURE,
852 "only the good die young (caught SIGTERM))\n");
853 return;
854 case SIGWINCH:
855 if (curses_active) {
856 shutdown_curses();
857 init_curses();
858 redraw_bot_win();
859 }
860 return;
861 case SIGINT:
862 PARA_WARNING_LOG("caught SIGINT, reset");
863 /* Nothing to do. SIGINT killed our child, para_client stat.
864 * This get noticed by do_select which resets everything
865 */
866 return;
867 case SIGUSR1:
868 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
869 com_reread_conf();
870 return;
871 case SIGCHLD:
872 check_sigchld();
873 return;
874 }
875 }
876
877 static int open_audiod_pipe(void)
878 {
879 static int init = 1;
880
881 if (init)
882 init = 0;
883 else
884 sleep(1);
885 return para_open_audiod_pipe(conf.stat_cmd_arg);
886 }
887
888 /*
889 * This is the core select loop. Besides the (internal) signal
890 * pipe, the following other fds are checked according to the mode:
891 *
892 * GETCH_MODE: check stdin, return when key is pressed
893 *
894 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
895 * of output has been read or when other end has closed command pipe or
896 * when any key is pressed.
897 *
898 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
899 * is running. During that time curses is disabled. Returns when
900 * cmd_pid == 0.
901 */
902 static int do_select(int mode)
903 {
904 fd_set rfds;
905 int ret;
906 int max_fileno, cp_numread = 1;
907 char command_buf[4096] = "";
908 int cbo = 0; /* command buf offset */
909 struct timeval tv;
910 repeat:
911 tv.tv_sec = conf.timeout_arg / 1000;
912 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
913 // ret = refresh_status();
914 FD_ZERO(&rfds);
915 max_fileno = 0;
916 /* audiod pipe */
917 if (audiod_pipe < 0)
918 audiod_pipe = open_audiod_pipe();
919 if (audiod_pipe >= 0)
920 para_fd_set(audiod_pipe, &rfds, &max_fileno);
921 /* signal pipe */
922 para_fd_set(signal_pipe, &rfds, &max_fileno);
923 /* command pipe only for COMMAND_MODE */
924 if (command_pipe >= 0 && mode == COMMAND_MODE)
925 para_fd_set(command_pipe, &rfds, &max_fileno);
926 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
927 if (ret <= 0)
928 goto check_return; /* skip fd checks */
929 /* signals */
930 if (FD_ISSET(signal_pipe, &rfds)) {
931 int sig_nr = para_next_signal();
932 if (sig_nr > 0)
933 handle_signal(sig_nr);
934 }
935 /* read command pipe if ready */
936 if (command_pipe >= 0 && mode == COMMAND_MODE &&
937 FD_ISSET(command_pipe, &rfds)) {
938 cp_numread = read(command_pipe, command_buf + cbo,
939 sizeof(command_buf) - 1 - cbo);
940 if (cp_numread >= 0)
941 cbo += cp_numread;
942 else {
943 if (cp_numread < 0)
944 PARA_ERROR_LOG("read error (%d)", cp_numread);
945 close(command_pipe);
946 command_pipe = -1;
947 }
948 }
949 if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
950 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
951 close(audiod_pipe);
952 audiod_pipe = -1;
953 clear_all_items();
954 free(stat_content[SI_BASENAME]);
955 stat_content[SI_BASENAME] =
956 para_strdup("audiod not running!?");
957 print_all_items();
958 }
959 check_return:
960 switch (mode) {
961 case COMMAND_MODE:
962 if (cp_numread <= 0 && !cbo) /* command complete */
963 return 0;
964 if (cbo)
965 cbo = for_each_line(command_buf, cbo,
966 &add_output_line, NULL);
967 if (cp_numread <= 0)
968 cbo = 0;
969 wrefresh(bot.win);
970 ret = wgetch(top.win);
971 if (ret != ERR && ret != KEY_RESIZE) {
972 if (command_pipe) {
973 close(command_pipe);
974 command_pipe = -1;
975 }
976 if (cmd_pid)
977 kill(cmd_pid, SIGTERM);
978 return -1;
979 }
980 break;
981 case GETCH_MODE:
982 ret = wgetch(top.win);
983 if (ret != ERR && ret != KEY_RESIZE)
984 return ret;
985 break;
986 case EXTERNAL_MODE:
987 if (cmd_died) {
988 cmd_died = 0;
989 return 0;
990 }
991 }
992 goto repeat;
993 }
994
995 /*
996 * read from command pipe and print data to bot window
997 */
998 static int send_output(void)
999 {
1000 int ret;
1001
1002 if (command_pipe < 0)
1003 return 0;
1004 ret = mark_fd_nonblocking(command_pipe);
1005 if (ret < 0) {
1006 close(command_pipe);
1007 return ret;
1008 }
1009 if (do_select(COMMAND_MODE) >= 0)
1010 PARA_INFO_LOG("command complete");
1011 else
1012 PARA_NOTICE_LOG("command aborted");
1013 print_in_bar(COLOR_MSG, " ");
1014 return 1;
1015 }
1016
1017 static int client_cmd_cmdline(char *cmd)
1018 {
1019 int ret, fds[3] = {0, 1, 0};
1020 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1021
1022 outputf(COLOR_COMMAND, "%s", c);
1023 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1024 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1025 free(c);
1026 if (ret < 0)
1027 return -1;
1028 command_pipe = fds[1];
1029 return send_output();
1030 }
1031
1032 /*
1033 * exec command and print output to bot win
1034 */
1035 static int display_cmd(char *cmd)
1036 {
1037 int fds[3] = {0, 1, 0};
1038
1039 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1040 outputf(COLOR_COMMAND, "%s", cmd);
1041 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1042 return -1;
1043 command_pipe = fds[1];
1044 return send_output();
1045 }
1046
1047 /*
1048 * shutdown curses and stat pipe before executing external commands
1049 */
1050 static int external_cmd(char *cmd)
1051 {
1052 int fds[3] = {-1, -1, -1};
1053
1054 if (cmd_pid)
1055 return -1;
1056 shutdown_curses();
1057 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1058 cmd_died = 0;
1059 do_select(EXTERNAL_MODE);
1060 init_curses();
1061 return 0;
1062 }
1063
1064 static void print_scroll_msg(void)
1065 {
1066 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1067 int first_rbe = first_visible_rbe(&lines_total);
1068 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1069 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1070 }
1071
1072 static void com_page_down(void)
1073 {
1074 unsigned lines = 0;
1075 int i = scroll_position;
1076 while (lines < bot.lines && --i > 0) {
1077 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1078 if (!rbe)
1079 break;
1080 lines += NUM_LINES(strlen(rbe->msg));
1081 }
1082 if (lines) {
1083 scroll_position = i;
1084 redraw_bot_win();
1085 print_scroll_msg();
1086 return;
1087 }
1088 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1089 }
1090
1091 static void com_page_up(void)
1092 {
1093 unsigned lines;
1094 int fvr = first_visible_rbe(&lines);
1095 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1096 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1097 return;
1098 }
1099 scroll_position = fvr + 1;
1100 for (; scroll_position > 0; scroll_position--) {
1101 fvr = first_visible_rbe(&lines);
1102 if (lines == bot.lines)
1103 break;
1104 }
1105 redraw_bot_win();
1106 print_scroll_msg();
1107 }
1108
1109 static void com_scroll_down(void)
1110 {
1111 struct rb_entry *rbe;
1112 int rbe_lines;
1113
1114 if (!scroll_position) {
1115 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1116 return;
1117 }
1118 scroll_position--;
1119 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1120 rbe_lines = NUM_LINES(rbe->len);
1121 wscrl(bot.win, rbe_lines);
1122 wmove(bot.win, bot.lines - rbe_lines, 0);
1123 wattron(bot.win, COLOR_PAIR(rbe->color));
1124 waddstr(bot.win, rbe->msg);
1125 wrefresh(bot.win);
1126 print_scroll_msg();
1127 }
1128
1129 static void com_scroll_up(void)
1130 {
1131 struct rb_entry *rbe = NULL;
1132 unsigned lines;
1133 int i, first_rbe, num_scroll;
1134
1135 /* the entry that is going to vanish */
1136 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1137 if (!rbe)
1138 goto err_out;
1139 num_scroll = NUM_LINES(rbe->len);
1140 first_rbe = first_visible_rbe(&lines);
1141 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1142 goto err_out;
1143 scroll_position++;
1144 wscrl(bot.win, -num_scroll);
1145 i = draw_top_rbe(&lines);
1146 if (i < 0)
1147 goto err_out;
1148 while (i > 0 && lines < num_scroll) {
1149 int rbe_lines;
1150 rbe = ringbuffer_get(bot_win_rb, --i);
1151 if (!rbe)
1152 break;
1153 rbe_lines = NUM_LINES(rbe->len);
1154 lines += rbe_lines;
1155 // fprintf(stderr, "msg: %s\n", rbe->msg);
1156 wattron(bot.win, COLOR_PAIR(rbe->color));
1157 waddstr(bot.win, "\n");
1158 waddstr(bot.win, rbe->msg);
1159 if (!i)
1160 break;
1161 i--;
1162 }
1163 wrefresh(bot.win);
1164 print_scroll_msg();
1165 return;
1166 err_out:
1167 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1168 }
1169
1170 static void com_ll_decr(void)
1171 {
1172 if (loglevel <= LL_DEBUG) {
1173 print_in_bar(COLOR_ERRMSG,
1174 "loglevel already at maximal verbosity\n");
1175 return;
1176 }
1177 loglevel--;
1178 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1179 }
1180
1181 static void com_ll_incr(void)
1182 {
1183 if (loglevel >= LL_EMERG) {
1184 print_in_bar(COLOR_ERRMSG,
1185 "loglevel already at minimal verbosity\n");
1186 return;
1187 }
1188 loglevel++;
1189 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1190 }
1191
1192 /*
1193 * reread configuration, terminate on errors
1194 */
1195 static void com_reread_conf(void)
1196 {
1197 char *cf =configfile_exists();
1198 struct gui_cmdline_parser_params params = {
1199 .override = 1,
1200 .initialize = 1,
1201 .check_required = 0,
1202 .check_ambiguity = 0
1203 };
1204
1205 if (!cf) {
1206 PARA_WARNING_LOG("there is no configuration to read");
1207 return;
1208 }
1209 PARA_INFO_LOG("rereading command line options and config file");
1210 gui_cmdline_parser(_argc, _argv, &conf);
1211 gui_cmdline_parser_config_file(cf, &conf, &params);
1212 PARA_NOTICE_LOG("config file reloaded");
1213 if (check_key_map_args() < 0)
1214 finish(EXIT_FAILURE);
1215 }
1216
1217 static void com_help(void)
1218 {
1219 int i;
1220
1221 for (i = 0; i < conf.key_map_given; ++i) {
1222 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1223 const char *handler_text = "???", *desc = NULL;
1224
1225 if (!split_key_map(tmp, &handler, &arg)) {
1226 free(tmp);
1227 return;
1228 }
1229 switch (*handler) {
1230 case 'i':
1231 handler_text = "internal";
1232 desc = command_list[find_cmd_byname(arg)].description;
1233 break;
1234 case 'x': handler_text = "external"; break;
1235 case 'd': handler_text = "display "; break;
1236 case 'p': handler_text = "para "; break;
1237 }
1238 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1239 strlen(arg) < 8? "\t" : "",
1240 desc? desc : "");
1241 free(tmp);
1242 }
1243 for (i = 0; command_list[i].handler; i++) {
1244 struct gui_command gc = command_list[i];
1245
1246 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1247 strlen(gc.name) < 8? "\t" : "",
1248 gc.description);
1249 }
1250 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1251 "for more info");
1252 }
1253
1254 static void com_shrink_top_win(void)
1255 {
1256 if (top.lines <= theme.top_lines_min) {
1257 PARA_WARNING_LOG("can not decrease top window");
1258 return;
1259 }
1260 init_wins(top.lines - 1);
1261 wclear(top.win);
1262 print_all_items();
1263 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1264 }
1265
1266 static void com_enlarge_top_win(void)
1267 {
1268 if (bot.lines < 3) {
1269 PARA_WARNING_LOG("can not increase top window");
1270 return;
1271 }
1272 init_wins(top.lines + 1);
1273 wclear(top.win);
1274 print_all_items();
1275 print_in_bar(COLOR_MSG, "increased top window");
1276 }
1277
1278 static void com_version(void)
1279 {
1280 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1281 CODENAME "\"");
1282 }
1283
1284 __noreturn static void com_quit(void)
1285 {
1286 finish(0);
1287 }
1288
1289 static void com_refresh(void)
1290 {
1291 shutdown_curses();
1292 init_curses();
1293 }
1294
1295 static void change_theme(int next)
1296 {
1297 if (next)
1298 next_theme(&theme);
1299 else
1300 prev_theme(&theme);
1301 /* This seems to be needed twice, why? */
1302 com_refresh();
1303 com_refresh();
1304 PARA_NOTICE_LOG("new theme: %s", theme.name);
1305 }
1306
1307 static void com_next_theme(void)
1308 {
1309 change_theme(1);
1310 }
1311
1312 static void com_prev_theme(void)
1313 {
1314 change_theme(0);
1315 }
1316
1317
1318 static void handle_command(int c)
1319 {
1320 int i;
1321
1322 /* first check user's key bindings */
1323 for (i = 0; i < conf.key_map_given; ++i) {
1324 char tmp[MAXLINE], *handler, *arg;
1325
1326 strcpy(tmp, conf.key_map_arg[i]);
1327 if (!split_key_map(tmp, &handler, &arg))
1328 return;
1329 if (!strcmp(tmp, km_keyname(c))) {
1330 if (*handler == 'd') {
1331 display_cmd(arg);
1332 return;
1333 }
1334 if (*handler == 'x') {
1335 external_cmd(arg);
1336 return;
1337 }
1338 if (*handler == 'p') {
1339 client_cmd_cmdline(arg);
1340 return;
1341 }
1342 if (*handler == 'i') {
1343 int num = find_cmd_byname(arg);
1344 if (num >= 0)
1345 command_list[num].handler();
1346 return;
1347 }
1348 }
1349 }
1350 /* not found, check internal key bindings */
1351 for (i = 0; command_list[i].handler; i++) {
1352 if (!strcmp(km_keyname(c), command_list[i].key)) {
1353 command_list[i].handler();
1354 return;
1355 }
1356 }
1357 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1358 km_keyname(c));
1359 }
1360
1361 int main(int argc, char *argv[])
1362 {
1363 int ret;
1364 char *cf;
1365
1366 _argc = argc;
1367 _argv = argv;
1368
1369 if (gui_cmdline_parser(argc, argv, &conf)) {
1370 fprintf(stderr, "parse error while reading command line\n");
1371 exit(EXIT_FAILURE);
1372 }
1373 HANDLE_VERSION_FLAG("gui", conf);
1374 init_theme(0, &theme);
1375 top.lines = theme.top_lines_default;
1376 if (check_key_map_args() < 0) {
1377 fprintf(stderr, "invalid key map\n");
1378 exit(EXIT_FAILURE);
1379 }
1380 cf = configfile_exists();
1381 if (!cf && conf.config_file_given) {
1382 fprintf(stderr, "can not read config file %s\n",
1383 conf.config_file_arg);
1384 exit(EXIT_FAILURE);
1385 }
1386 if (cf) {
1387 struct gui_cmdline_parser_params params = {
1388 .override = 0,
1389 .initialize = 0,
1390 .check_required = 0,
1391 .check_ambiguity = 0
1392 };
1393 gui_cmdline_parser_config_file(cf, &conf, &params);
1394 }
1395 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1396 if (check_key_map_args() < 0) {
1397 fprintf(stderr, "invalid key map in config file\n");
1398 exit(EXIT_FAILURE);
1399 }
1400 setup_signal_handling();
1401 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1402 initscr(); /* needed only once, always successful */
1403 init_curses();
1404 print_welcome();
1405 for (;;) {
1406 print_status_bar();
1407 ret = do_select(GETCH_MODE);
1408 if (!ret)
1409 continue;
1410 print_in_bar(COLOR_MSG, " ");
1411 handle_command(ret);
1412 }
1413 }