fff5741dca26c6a472cd67b2fdd7d638131fe3b6
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2006 Andre Noll <maan@systemlinux.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
17 */
18
19 /** \file gui.c ncurses-based interface for paraslash */
20
21 #include "gui.cmdline.h"
22 #include "para.h"
23 #include <curses.h>
24 #include "ringbuffer.h"
25 #include "string.h"
26
27 extern const char *status_item_list[NUM_STAT_ITEMS];
28 static char *stat_content[NUM_STAT_ITEMS];
29
30 #define STANDARD_STATUS_BAR "para_gui " VERSION " (hit ? for help)"
31
32 static int signal_pipe;
33
34 static void finish(int sig);
35
36 static struct win_data {
37 WINDOW *win;
38 NCURSES_SIZE_T begx;
39 NCURSES_SIZE_T begy;
40 NCURSES_SIZE_T cols;
41 NCURSES_SIZE_T lines;
42 } top, bot, sb, in, sep;
43
44 #define RINGBUFFER_SIZE 512
45 struct rb_entry {
46 char *msg;
47 size_t len;
48 int color;
49 };
50 void *bot_win_rb;
51 #define NUM_LINES(len) (1 + (len) / bot.cols)
52
53 static unsigned scroll_position;
54
55 static int external_cmd_died, curses_active;
56 static pid_t external_cmd_pid;
57
58 static int command_pipe = -1;
59 static int audiod_pipe = -1;
60 static struct gengetopt_args_info conf;
61
62 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
63
64
65 #define COLOR_STATUSBAR 32
66 #define COLOR_COMMAND 33
67 #define COLOR_OUTPUT 34
68 #define COLOR_MSG 35
69 #define COLOR_ERRMSG 36
70 #define COLOR_WELCOME 37
71 #define COLOR_SEPARATOR 38
72 #define COLOR_TOP 39
73 #define COLOR_BOT 40
74
75 struct gui_command {
76 char *key;
77 char *name;
78 char *description;
79 void (*handler)(void);
80 };
81
82 struct stat_item {
83 char name[MAXLINE];
84 char prefix[MAXLINE];
85 char postfix[MAXLINE];
86 unsigned y;
87 unsigned x;
88 unsigned len;
89 int fg, bg;
90 int align;
91 char content[MAXLINE];
92 };
93
94 static struct gui_theme theme;
95
96 int _argc;
97 char **_argv;
98
99 static void com_help(void);
100 static void com_reread_conf(void);
101 static void com_enlarge_top_win(void);
102 static void com_shrink_top_win(void);
103 static void com_version(void);
104 static void com_quit(void);
105 static void com_refresh(void);
106 static void com_ll_incr(void);
107 static void com_ll_decr(void);
108 static void com_prev_theme(void);
109 static void com_next_theme(void);
110 static void com_scroll_up(void);
111 static void com_scroll_down(void);
112 static void com_page_up(void);
113 static void com_page_down(void);
114
115 struct gui_command command_list[] = {
116 {
117 .key = "?",
118 .name = "help",
119 .description = "print help",
120 .handler = com_help
121 }, {
122 .key = "+",
123 .name = "enlarge_win",
124 .description = "enlarge the top window",
125 .handler = com_enlarge_top_win
126 }, {
127 .key = "-",
128 .name = "shrink_win",
129 .description = "shrink the top window",
130 .handler = com_shrink_top_win
131 }, {
132 .key = "r",
133 .name = "reread_conf",
134 .description = "reread configuration file",
135 .handler = com_reread_conf
136 }, {
137 .key = "q",
138 .name = "quit",
139 .description = "exit para_gui",
140 .handler = com_quit
141 }, {
142 .key = "^L",
143 .name = "refresh",
144 .description = "redraw the screen",
145 .handler = com_refresh
146 }, {
147 .key = ".",
148 .name = "next_theme",
149 .description = "switch to next theme",
150 .handler = com_next_theme
151 }, {
152 .key = ",",
153 .name = "prev_theme",
154 .description = "switch to previous stream",
155 .handler = com_prev_theme
156 }, {
157 .key = ">",
158 .name = "ll_incr",
159 .description = "increase loglevel (decreases verbosity)",
160 .handler = com_ll_incr
161 }, {
162 .key = "<",
163 .name = "ll_decr",
164 .description = "decrease loglevel (increases verbosity)",
165 .handler = com_ll_decr
166 }, {
167 .key = "V",
168 .name = "version",
169 .description = "show the para_gui version",
170 .handler = com_version
171 }, {
172 .key = "<up>",
173 .name = "scroll_up",
174 .description = "scroll up one line",
175 .handler = com_scroll_up
176 }, {
177 .key = "<down>",
178 .name = "scroll_down",
179 .description = "scroll down one line",
180 .handler = com_scroll_down
181 }, {
182 .key = "<ppage>",
183 .name = "page_up",
184 .description = "scroll up one page",
185 .handler = com_page_up
186 }, {
187 .key = "<npage>",
188 .name = "page_down",
189 .description = "scroll down one page",
190 .handler = com_page_down
191 }, {
192 .handler = NULL
193 }
194 };
195
196 static int find_cmd_byname(char *name)
197 {
198 int i;
199
200 for (i = 0; command_list[i].handler; i++)
201 if (!strcmp(command_list[i].name, name))
202 return i;
203 return -1;
204 }
205
206 /* taken from mutt */
207 static char *km_keyname(int c)
208 {
209 static char buf[10];
210
211 if (c == KEY_UP) {
212 sprintf(buf, "<up>");
213 return buf;
214 }
215 if (c == KEY_DOWN) {
216 sprintf(buf, "<down>");
217 return buf;
218 }
219 if (c == KEY_LEFT) {
220 sprintf(buf, "<left>");
221 return buf;
222 }
223 if (c == KEY_RIGHT) {
224 sprintf(buf, "<right>");
225 return buf;
226 }
227 if (c == KEY_NPAGE) {
228 sprintf(buf, "<npage>");
229 return buf;
230 }
231 if (c == KEY_PPAGE) {
232 sprintf(buf, "<ppage>");
233 return buf;
234 }
235 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
236 if (c < 0)
237 c += 256;
238 if (c < 128) {
239 buf[0] = '^';
240 buf[1] = (c + '@') & 0x7f;
241 buf[2] = 0;
242 } else
243 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
244 (c >> 3) & 7, c & 7);
245 } else if (c >= KEY_F0 && c < KEY_F(256))
246 sprintf(buf, "<F%d>", c - KEY_F0);
247 else if (isprint(c))
248 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
249 else
250 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
251 return buf;
252 }
253
254 static char *configfile_exists(void)
255 {
256 static char *config_file;
257 char *tmp;
258
259 if (!conf.config_file_given) {
260 if (!config_file) {
261 char *home = para_homedir();
262 config_file = make_message("%s/.paraslash/gui.conf",
263 home);
264 free(home);
265 }
266 tmp = config_file;
267 } else
268 tmp = conf.config_file_arg;
269 return file_exists(tmp)? tmp: NULL;
270 }
271
272 /*
273 * print num spaces to curses window
274 */
275 static void add_spaces(WINDOW* win, unsigned int num)
276 {
277 while (num > 0) {
278 num--;
279 waddstr(win, " ");
280 }
281 }
282
283 /*
284 * print aligned string to curses window. This function always prints
285 * exactly len chars.
286 */
287 static int align_str(WINDOW* win, char *string, unsigned int len,
288 unsigned int align)
289 {
290 int num; /* of spaces */
291 char *str;
292
293 if (!win || !string)
294 return -1;
295 num = len - strlen(string);
296 str = para_strdup(string);
297 if (num < 0) {
298 str[len] = '\0';
299 num = 0;
300 }
301 if (align == LEFT) {
302 waddstr(win, str);
303 add_spaces(win, num);
304 } else if (align == RIGHT) {
305 add_spaces(win, num);
306 waddstr(win, str);
307 } else {
308 add_spaces(win, num / 2);
309 waddstr(win, str[0]? str: "");
310 add_spaces(win, num - num / 2);
311 }
312 free(str);
313 return 1;
314 }
315
316 __printf_2_3 static void print_in_bar(int color, char *fmt,...)
317 {
318 char *msg;
319
320 if (!curses_active)
321 return;
322 wattron(in.win, COLOR_PAIR(color));
323 PARA_VSPRINTF(fmt, msg);
324 wmove(in.win, 0, 0);
325 align_str(in.win, msg, sb.cols, LEFT);
326 free(msg);
327 wrefresh(in.win);
328 }
329
330 /*
331 * update the status bar
332 */
333 static void print_status_bar(void)
334 {
335 if (!curses_active)
336 return;
337 wmove(sb.win, 0, 0);
338 align_str(sb.win,STANDARD_STATUS_BAR, sb.cols, CENTER);
339 wrefresh(sb.win);
340 }
341
342 /*
343 * get the number of the oldest rbe that is (partially) visible. On return,
344 * lines contains the sum of the number of lines of all visable entries. If the
345 * first one is only partially visible, lines is greater than bot.lines.
346 */
347 static int first_visible_rbe(unsigned *lines)
348 {
349 int i;
350 *lines = 0;
351 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
352 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
353 int rbe_lines;
354 if (!rbe)
355 return i - 1;
356 // fprintf(stderr, "found: %s\n", rbe->msg);
357 rbe_lines = NUM_LINES(rbe->len);
358 if (rbe_lines > bot.lines)
359 return -1;
360 *lines += rbe_lines;
361 if (*lines >= bot.lines)
362 return i;
363 }
364 return RINGBUFFER_SIZE - 1;
365 }
366
367 static int draw_top_rbe(unsigned *lines)
368 {
369 unsigned len;
370 int offset, fvr = first_visible_rbe(lines);
371 struct rb_entry *rbe;
372
373 if (fvr < 0)
374 return -1;
375 wmove(bot.win, 0, 0);
376 rbe = ringbuffer_get(bot_win_rb, fvr);
377 if (!rbe)
378 return -1;
379 /* first rbe might be only partially visible */
380 offset = (*lines - bot.lines) * bot.cols;
381 len = strlen(rbe->msg);
382 if (offset < 0 || len < offset)
383 return -1;
384 wattron(bot.win, COLOR_PAIR(rbe->color));
385 waddstr(bot.win, rbe->msg + offset);
386 *lines = NUM_LINES(len - offset);
387 return fvr;
388 }
389
390 static void redraw_bot_win(void)
391 {
392 unsigned lines;
393 int i;
394
395 wmove(bot.win, 0, 0);
396 wclear(bot.win);
397 i = draw_top_rbe(&lines);
398 if (i <= 0)
399 goto out;
400 while (i > 0 && lines < bot.lines) {
401 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
402 if (!rbe) {
403 lines++;
404 waddstr(bot.win, "\n");
405 continue;
406 }
407 lines += NUM_LINES(rbe->len);
408 wattron(bot.win, COLOR_PAIR(rbe->color));
409 waddstr(bot.win, "\n");
410 waddstr(bot.win, rbe->msg);
411 }
412 out:
413 wrefresh(bot.win);
414 }
415
416 static void rb_add_entry(int color, char *msg)
417 {
418 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
419 int x, y;
420 new->color = color;
421 new->len = strlen(msg);
422 new->msg = msg;
423 old = ringbuffer_add(bot_win_rb, new);
424 // fprintf(stderr, "added: %s\n", new->msg);
425 if (old) {
426 free(old->msg);
427 free(old);
428 }
429 if (scroll_position) {
430 /* discard current scrolling, like xterm does */
431 scroll_position = 0;
432 redraw_bot_win();
433 return;
434 }
435 wattron(bot.win, COLOR_PAIR(color));
436 getyx(bot.win, y, x);
437 if (y || x)
438 waddstr(bot.win, "\n");
439 waddstr(bot.win, msg);
440 }
441
442 /*
443 * print formated output to bot win and refresh
444 */
445 __printf_2_3 static void outputf(int color, char* fmt,...)
446 {
447 char *msg;
448
449 if (!curses_active)
450 return;
451 PARA_VSPRINTF(fmt, msg);
452 rb_add_entry(color, msg);
453 wrefresh(bot.win);
454 }
455
456 static void add_output_line(char *line)
457 {
458 if (!curses_active)
459 return;
460 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
461 }
462
463 void para_log(int ll, char *fmt,...)
464 {
465 int color;
466 char *msg;
467
468 if (ll < conf.loglevel_arg || !curses_active)
469 return;
470 switch (ll) {
471 case DEBUG:
472 case INFO:
473 case NOTICE:
474 color = COLOR_MSG;
475 break;
476 default:
477 color = COLOR_ERRMSG;
478 }
479 PARA_VSPRINTF(fmt, msg);
480 chop(msg);
481 rb_add_entry(color, msg);
482 wrefresh(bot.win);
483 }
484
485 static void setup_signal_handling(void)
486 {
487 signal_pipe = para_signal_init();
488 para_install_sighandler(SIGINT);
489 para_install_sighandler(SIGTERM);
490 para_install_sighandler(SIGCHLD);
491 para_install_sighandler(SIGWINCH);
492 para_install_sighandler(SIGUSR1);
493 signal(SIGPIPE, SIG_IGN);
494 signal(SIGHUP, SIG_IGN);
495 }
496
497 static void do_exit(int ret)
498 {
499 signal(SIGTERM, SIG_IGN);
500 kill(0, SIGTERM);
501 exit(ret);
502 }
503
504 static void shutdown_curses(void)
505 {
506 if (!curses_active)
507 return;
508 def_prog_mode();
509 curses_active = 0;
510 endwin();
511 }
512
513 static void finish(int ret)
514 {
515 shutdown_curses();
516 do_exit(ret);
517 }
518
519 /*
520 * exit curses and print given message to stdout/stderr
521 */
522 __printf_2_3 static void msg_n_exit(int ret, char* fmt, ...)
523 {
524 va_list argp;
525 FILE *outfd = ret? stderr: stdout;
526
527 shutdown_curses();
528 va_start(argp, fmt);
529 vfprintf(outfd, fmt, argp);
530 va_end(argp);
531 do_exit(ret);
532 }
533
534 static void print_welcome(void)
535 {
536 int ll = conf.loglevel_arg;
537 if (ll > NOTICE)
538 return;
539 outputf(COLOR_WELCOME, "Welcome to para_gui " VERSION
540 " \"" CODENAME "\". Theme: %s", theme.name);
541 wclrtoeol(bot.win);
542 }
543
544 /*
545 * init all windows
546 */
547 static void init_wins(int top_lines)
548 {
549 int i;
550
551 top.lines = top_lines;
552 top.cols = COLS;
553 top.begy = 0;
554 top.begx = 0;
555
556 bot.lines = LINES - top.lines - 3;
557 bot.cols = COLS;
558 bot.begy = top.lines + 1;
559 bot.begx = 0;
560
561 sb.lines = 1;
562 sb.cols = COLS;
563 sb.begy = LINES - 2;
564 sb.begx = 0;
565
566 in.lines = 1;
567 in.cols = COLS;
568 in.begy = LINES - 1;
569 in.begx = 0;
570
571 sep.lines = 1;
572 sep.cols = COLS;
573 sep.begy = top.lines;
574 sep.begx = 0;
575
576 assume_default_colors(theme.default_fg, theme.default_bg);
577 if (top.win) {
578 mvwin(top.win, top.begy, top.begx);
579 wresize(top.win, top.lines, top.cols);
580
581 mvwin(sb.win, sb.begy, sb.begx);
582 wresize(sb.win, sb.lines, sb.cols);
583
584 mvwin(sep.win, sep.begy, sep.begx);
585 wresize(sep.win, sep.lines, sep.cols);
586
587 mvwin(bot.win, bot.begy, bot.begx);
588 wresize(bot.win, bot.lines, bot.cols);
589
590 mvwin(in.win, in.begy, in.begx);
591 wresize(in.win, in.lines, in.cols);
592 } else {
593 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
594 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
595 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
596 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
597 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
598 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
599 msg_n_exit(1, "Error: Cannot create curses windows\n");
600 wclear(bot.win);
601 wclear(sb.win);
602 wclear(in.win);
603 scrollok(bot.win, 1);
604 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
605 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
606 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
607 wattron(top.win, COLOR_PAIR(COLOR_TOP));
608 nodelay(top.win, 1);
609 nodelay(bot.win, 1);
610 nodelay(sb.win, 1);
611 nodelay(in.win, 0);
612
613 keypad(top.win, 1);
614 keypad(bot.win, 1);
615 keypad(sb.win, 1);
616 keypad(in.win, 1);
617 print_status_bar();
618 }
619 wmove(sep.win, 0, 0);
620 for (i = 1; i <= COLS; i++)
621 waddstr(sep.win, theme.sep_str);
622 wclear(top.win);
623 //wclear(bot.win);
624 wnoutrefresh(top.win);
625 wnoutrefresh(bot.win);
626 //wnoutrefresh(sb.win);
627 print_status_bar();
628 wnoutrefresh(in.win);
629 wnoutrefresh(sep.win);
630 doupdate();
631 }
632
633 static void check_geometry(void)
634 {
635 if (LINES < theme.lines_min || COLS < theme.cols_min)
636 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
637 " (need at least %dx%d)\n", COLS, LINES,
638 theme.cols_min, theme.lines_min);
639 }
640
641 /*
642 * Print stat item #i to curses window
643 */
644 static void print_stat_item(int i)
645 {
646 char *tmp;
647 struct stat_item_data d = theme.data[i];
648 char *c = stat_content[i];
649
650 if (!curses_active || !d.len || !c)
651 return;
652 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
653 // PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
654 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
655 wrefresh(top.win);
656 wattron(top.win, COLOR_PAIR(i + 1));
657 align_str(top.win, tmp, d.len * COLS / 100, d.align);
658 free(tmp);
659 wrefresh(top.win);
660 }
661
662 static void print_all_items(void)
663 {
664 int i;
665
666 if (!curses_active)
667 return;
668 for (i = 0; i < NUM_STAT_ITEMS; i++)
669 print_stat_item(i);
670 }
671 static void clear_all_items(void)
672 {
673 int i;
674
675 for (i = 0; i < NUM_STAT_ITEMS; i++) {
676 free(stat_content[i]);
677 stat_content[i] = para_strdup("");
678 }
679 }
680
681 static void init_colors(void)
682 {
683 int i;
684 if (!has_colors())
685 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
686 start_color();
687 for (i = 0; i < NUM_STAT_ITEMS; i++)
688 if (theme.data[i].len)
689 init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
690 init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
691 init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
692 init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
693 init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
694 init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
695 init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
696 init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
697 init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
698 init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
699 }
700
701 /*
702 * (re-)initialize the curses library FIXME: Error checking
703 */
704 static void init_curses(void)
705 {
706 curses_active = 1;
707 if (top.win && refresh() == ERR) { /* refesh is really needed */
708 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
709 }
710 check_geometry();
711 curs_set(0); /* make cursor invisible, ignore errors */
712 // if (noraw() == ERR);
713 // msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
714 // "raw mode\n");
715 nonl(); /* tell curses not to do NL->CR/NL on output */
716 noecho(); /* don't echo input */
717 cbreak(); /* take input chars one at a time, no wait for \n */
718 //reset_prog_mode();
719 init_colors();
720 clear();
721 init_wins(theme.top_lines_default);
722 print_all_items();
723 noecho(); /* don't echo input */
724 }
725
726
727 static void check_sigchld(void)
728 {
729 pid_t pid;
730 reap_next_child:
731 pid = para_reap_child();
732 if (pid <= 0)
733 return;
734 if (pid == external_cmd_pid) {
735 external_cmd_pid = 0;
736 external_cmd_died = 1;
737 }
738 goto reap_next_child;
739 }
740
741 /*
742 * print status line if line starts with known command.
743 */
744 static void check_stat_line(char *line)
745 {
746 int i;
747
748 // PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
749 i = stat_line_valid(line);
750 if (i >= 0) {
751 line += strlen(status_item_list[i]) + 1;
752 free(stat_content[i]);
753 stat_content[i] = para_strdup(line);
754 print_stat_item(i);
755 }
756 return;
757 }
758
759 /*
760 * This sucker modifies its first argument. *handler and *arg are
761 * pointers to 0-terminated strings (inside line). Crap.
762 */
763 static int split_key_map(char *line, char **handler, char **arg)
764 {
765 if (!(*handler = strchr(line + 1, ':')))
766 goto err_out;
767 **handler = '\0';
768 (*handler)++;
769 if (!(*arg = strchr(*handler, ':')))
770 goto err_out;
771 **arg = '\0';
772 (*arg)++;
773 return 1;
774 err_out:
775 return 0;
776 }
777
778 static int check_key_map_args(void)
779 {
780 char *s;
781 int i, ret = -1;
782 char *tmp = NULL, *handler, *arg;
783
784 for (i = 0; i < conf.key_map_given; ++i) {
785 s = conf.key_map_arg[i];
786 if (!(*s))
787 goto err_out;
788 free(tmp);
789 tmp = para_strdup(s);
790 if (!split_key_map(tmp, &handler, &arg))
791 goto err_out;
792 if (strlen(handler) != 1)
793 goto err_out;
794 if (*handler != 'x'
795 && *handler != 'd'
796 && *handler != 'i'
797 && *handler != 'p')
798 goto err_out;
799 if (*handler != 'i')
800 continue;
801 if (find_cmd_byname(arg) < 0)
802 goto err_out;
803 }
804 ret = 0;
805 err_out:
806 free(tmp);
807 return ret;
808 }
809
810 /*
811 * React to various signal-related events
812 */
813 static void handle_signal(int sig)
814 {
815 switch (sig) {
816 case SIGTERM:
817 msg_n_exit(EXIT_FAILURE,
818 "only the good die young (caught SIGTERM))\n");
819 return;
820 case SIGWINCH:
821 if (curses_active) {
822 shutdown_curses();
823 init_curses();
824 redraw_bot_win();
825 }
826 return;
827 case SIGINT:
828 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
829 /* Nothing to do. SIGINT killed our child, para_client stat.
830 * This get noticed by do_select which resets everything
831 */
832 return;
833 case SIGUSR1:
834 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
835 com_reread_conf();
836 return;
837 case SIGCHLD:
838 check_sigchld();
839 return;
840 }
841 }
842
843 static int open_audiod_pipe(void)
844 {
845 static int init = 1;
846
847 if (init)
848 init = 0;
849 else
850 sleep(1);
851 return para_open_audiod_pipe(conf.stat_cmd_arg);
852 }
853
854 /*
855 * This is the core select loop. Besides the (internal) signal
856 * pipe, the following other fds are checked according to the mode:
857 *
858 * GETCH_MODE: check stdin, return when key is pressed
859 *
860 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
861 * of output has been read or when other end has closed command pipe or
862 * when any key is pressed.
863 *
864 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
865 * is running. During that thime curses is disabled. Returns when
866 * external_cmd_pid == 0.
867 */
868 static int do_select(int mode)
869 {
870 fd_set rfds;
871 int ret;
872 int max_fileno, cp_numread = 1;
873 char command_buf[STRINGSIZE] = "";
874 int cbo = 0; /* command buf offset */
875 struct timeval tv;
876 repeat:
877 tv.tv_sec = conf.timeout_arg / 1000;
878 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
879 // ret = refresh_status();
880 FD_ZERO(&rfds);
881 max_fileno = 0;
882 /* audiod pipe */
883 if (audiod_pipe < 0)
884 audiod_pipe = open_audiod_pipe();
885 if (audiod_pipe >= 0) {
886 FD_SET(audiod_pipe, &rfds);
887 max_fileno = MAX(max_fileno, audiod_pipe);
888 }
889
890 /* signal pipe */
891 FD_SET(signal_pipe, &rfds);
892 max_fileno = MAX(max_fileno, signal_pipe);
893 /* command pipe only for COMMAND_MODE */
894 if (command_pipe >= 0 && mode == COMMAND_MODE) {
895 FD_SET(command_pipe, &rfds);
896 max_fileno = MAX(max_fileno, command_pipe);
897 }
898 if (curses_active)
899 FD_SET(STDIN_FILENO, &rfds);
900 ret = select(max_fileno + 1, &rfds, NULL, NULL, &tv);
901 // PARA_DEBUG_LOG("select returned %d\n", ret);
902
903 /* signals */
904 if (FD_ISSET(signal_pipe, &rfds)) {
905 int sig_nr = para_next_signal();
906 if (sig_nr > 0)
907 handle_signal(sig_nr);
908 }
909 if (ret <= 0)
910 goto check_return; /* skip fd checks */
911 /* read command pipe if ready */
912 if (command_pipe >= 0 && mode == COMMAND_MODE &&
913 FD_ISSET(command_pipe, &rfds)) {
914 cp_numread = read(command_pipe, command_buf + cbo,
915 STRINGSIZE - 1 - cbo);
916 if (cp_numread >= 0)
917 cbo += cp_numread;
918 else {
919 if (cp_numread < 0)
920 PARA_ERROR_LOG("read error (%d)", cp_numread);
921 close(command_pipe);
922 command_pipe = -1;
923 }
924 }
925 if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
926 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
927 close(audiod_pipe);
928 audiod_pipe = -1;
929 clear_all_items();
930 free(stat_content[SI_STATUS_BAR]);
931 stat_content[SI_STATUS_BAR] =
932 para_strdup("audiod not running!?");
933 print_all_items();
934 }
935 check_return:
936 switch (mode) {
937 case COMMAND_MODE:
938 if (cp_numread <= 0 && !cbo) /* command complete */
939 return 0;
940 if (cbo)
941 cbo = for_each_line(command_buf, cbo, &add_output_line);
942 if (cp_numread <= 0)
943 cbo = 0;
944 wrefresh(bot.win);
945 break;
946 case GETCH_MODE:
947 ret = wgetch(top.win);
948 if (ret != ERR && ret != KEY_RESIZE)
949 return ret;
950 break;
951 case EXTERNAL_MODE:
952 if (external_cmd_died) {
953 external_cmd_died = 0;
954 return 0;
955 }
956 }
957 goto repeat;
958 }
959
960 /*
961 * read from command pipe and print data to bot window
962 */
963 static int send_output(void)
964 {
965 if (command_pipe < 0)
966 return 0;
967 if (do_select(COMMAND_MODE) >= 0)
968 PARA_INFO_LOG("%s", "command complete");
969 else
970 PARA_NOTICE_LOG("%s", "command aborted");
971 print_in_bar(COLOR_MSG, " ");
972 return 1;
973 }
974
975 static int client_cmd_cmdline(char *cmd)
976 {
977 pid_t pid;
978 int ret, fds[3] = {0, 1, 0};
979 char *c = make_message(BINDIR "/para_client %s", cmd);
980
981 outputf(COLOR_COMMAND, "%s", c);
982 print_in_bar(COLOR_MSG, "executing client command, hit q to abort\n");
983 ret = para_exec_cmdline_pid(&pid, c, fds);
984 free(c);
985 if (ret < 0)
986 return -1;
987 command_pipe = fds[1];
988 return send_output();
989 }
990
991 /*
992 * exec command and print output to bot win
993 */
994 static int display_cmd(char *cmd)
995 {
996 pid_t pid;
997 int fds[3] = {0, 1, 0};
998
999 print_in_bar(COLOR_MSG, "executing display command, hit q to abort");
1000 outputf(COLOR_COMMAND, "%s", cmd);
1001 if (para_exec_cmdline_pid(&pid, cmd, fds) < 0)
1002 return -1;
1003 command_pipe = fds[1];
1004 return send_output();
1005 }
1006
1007 /*
1008 * shutdown curses and stat pipe before executing external commands
1009 */
1010 static int external_cmd(char *cmd)
1011 {
1012 int fds[3] = {-1, -1, -1};
1013
1014 if (external_cmd_pid)
1015 return -1;
1016 shutdown_curses();
1017 para_exec_cmdline_pid(&external_cmd_pid, cmd, fds);
1018 do_select(EXTERNAL_MODE);
1019 init_curses();
1020 return 0;
1021 }
1022
1023 static void print_scroll_msg(void)
1024 {
1025 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1026 int first_rbe = first_visible_rbe(&lines_total);
1027 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1028 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1029 }
1030
1031 static void com_page_down(void)
1032 {
1033 unsigned lines = 0;
1034 int i = scroll_position;
1035 while (lines < bot.lines && --i > 0) {
1036 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1037 if (!rbe)
1038 break;
1039 lines += NUM_LINES(strlen(rbe->msg));
1040 }
1041 if (lines) {
1042 scroll_position = i;
1043 redraw_bot_win();
1044 print_scroll_msg();
1045 return;
1046 }
1047 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1048 }
1049
1050 static void com_page_up(void)
1051 {
1052 unsigned lines;
1053 int fvr = first_visible_rbe(&lines);
1054 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1055 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1056 return;
1057 }
1058 scroll_position = fvr + 1;
1059 for (; scroll_position > 0; scroll_position--) {
1060 fvr = first_visible_rbe(&lines);
1061 if (lines == bot.lines)
1062 break;
1063 }
1064 redraw_bot_win();
1065 print_scroll_msg();
1066 }
1067
1068 static void com_scroll_down(void)
1069 {
1070 struct rb_entry *rbe;
1071 int rbe_lines;
1072
1073 if (!scroll_position) {
1074 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1075 return;
1076 }
1077 scroll_position--;
1078 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1079 rbe_lines = NUM_LINES(rbe->len);
1080 wscrl(bot.win, rbe_lines);
1081 wmove(bot.win, bot.lines - rbe_lines, 0);
1082 wattron(bot.win, COLOR_PAIR(rbe->color));
1083 waddstr(bot.win, rbe->msg);
1084 wrefresh(bot.win);
1085 print_scroll_msg();
1086 }
1087
1088 static void com_scroll_up(void)
1089 {
1090 struct rb_entry *rbe = NULL;
1091 unsigned lines;
1092 int i, first_rbe, scroll;
1093
1094 /* the entry that is going to vanish */
1095 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1096 if (!rbe)
1097 goto err_out;
1098 scroll = NUM_LINES(rbe->len);
1099 first_rbe = first_visible_rbe(&lines);
1100 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1101 goto err_out;
1102 scroll_position++;
1103 wscrl(bot.win, -scroll);
1104 i = draw_top_rbe(&lines);
1105 if (i < 0)
1106 goto err_out;
1107 while (i > 0 && lines < scroll) {
1108 int rbe_lines;
1109 rbe = ringbuffer_get(bot_win_rb, --i);
1110 if (!rbe)
1111 break;
1112 rbe_lines = NUM_LINES(rbe->len);
1113 lines += rbe_lines;
1114 // fprintf(stderr, "msg: %s\n", rbe->msg);
1115 wattron(bot.win, COLOR_PAIR(rbe->color));
1116 waddstr(bot.win, "\n");
1117 waddstr(bot.win, rbe->msg);
1118 if (!i)
1119 break;
1120 i--;
1121 }
1122 wrefresh(bot.win);
1123 print_scroll_msg();
1124 return;
1125 err_out:
1126 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1127 }
1128
1129 static void com_ll_decr(void)
1130 {
1131 if (conf.loglevel_arg <= DEBUG) {
1132 print_in_bar(COLOR_ERRMSG,
1133 "loglevel already at maximal verbosity\n");
1134 return;
1135 }
1136 conf.loglevel_arg--;
1137 print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1138 }
1139
1140 static void com_ll_incr(void)
1141 {
1142 if (conf.loglevel_arg >= EMERG) {
1143 print_in_bar(COLOR_ERRMSG,
1144 "loglevel already at miminal verbosity\n");
1145 return;
1146 }
1147 conf.loglevel_arg++;
1148 print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1149 }
1150
1151 /*
1152 * reread configuration, terminate on errors
1153 */
1154 static void com_reread_conf(void)
1155 {
1156 char *cf =configfile_exists();
1157
1158 if (!cf) {
1159 PARA_WARNING_LOG("%s", "there is no configuration to read");
1160 return;
1161 }
1162 PARA_INFO_LOG("%s", "rereading command line options and config file");
1163 cmdline_parser(_argc, _argv, &conf);
1164 cmdline_parser_configfile(cf, &conf, 1, 1, 0);
1165 PARA_NOTICE_LOG("%s", "configuration read");
1166 if (check_key_map_args() < 0)
1167 finish(EXIT_FAILURE);
1168 }
1169
1170 static void com_help(void)
1171 {
1172 int i;
1173
1174 for (i = 0; i < conf.key_map_given; ++i) {
1175 char *s = conf.key_map_arg[i], *handler, *arg,
1176 *desc = "", tmp[MAXLINE];
1177
1178 strcpy(tmp, s);
1179 if (!split_key_map(tmp, &handler, &arg))
1180 return;
1181 switch(*handler) {
1182 case 'i':
1183 handler = "internal";
1184 desc = command_list[find_cmd_byname(arg)].description;
1185 break;
1186 case 'x': handler = "external"; break;
1187 case 'd': handler = "display "; break;
1188 case 'p': handler = "para "; break;
1189 }
1190 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler, arg,
1191 strlen(arg) < 8? "\t" : "",
1192 desc);
1193 }
1194 for (i = 0; command_list[i].handler; i++) {
1195 struct gui_command gc = command_list[i];
1196
1197 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1198 strlen(gc.name) < 8? "\t" : "",
1199 gc.description);
1200 }
1201 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1202 "for more info");
1203 return;
1204 }
1205
1206 static void com_shrink_top_win(void)
1207 {
1208 if (top.lines <= theme.top_lines_min) {
1209 PARA_WARNING_LOG("%s", "can not decrease top window");
1210 return;
1211 }
1212 init_wins(top.lines - 1);
1213 wclear(top.win);
1214 print_all_items();
1215 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1216 }
1217
1218 static void com_enlarge_top_win(void)
1219 {
1220 if (bot.lines < 3) {
1221 PARA_WARNING_LOG("%s", "can not increase top window");
1222 return;
1223 }
1224 init_wins(top.lines + 1);
1225 wclear(top.win);
1226 print_all_items();
1227 print_in_bar(COLOR_MSG, "increased top window");
1228 }
1229
1230 static void com_version(void)
1231 {
1232 print_in_bar(COLOR_MSG, "para_gui " VERSION " \"" CODENAME "\"");
1233 }
1234
1235 static void com_quit(void)
1236 {
1237 finish(0);
1238 }
1239
1240 static void com_refresh(void)
1241 {
1242 shutdown_curses();
1243 init_curses();
1244 }
1245
1246 static void change_theme(int next)
1247 {
1248 if (next)
1249 next_theme(&theme);
1250 else
1251 prev_theme(&theme);
1252 /* This seems to be needed twice, why? */
1253 com_refresh();
1254 com_refresh();
1255 PARA_NOTICE_LOG("new theme: %s", theme.name);
1256 }
1257
1258 static void com_next_theme(void)
1259 {
1260 change_theme(1);
1261 }
1262
1263 static void com_prev_theme(void)
1264 {
1265 change_theme(0);
1266 }
1267
1268
1269 static void handle_command(int c)
1270 {
1271 int i;
1272
1273 /* first check user's key bindings */
1274 for (i = 0; i < conf.key_map_given; ++i) {
1275 char tmp[MAXLINE], *handler, *arg;
1276
1277 strcpy(tmp, conf.key_map_arg[i]);
1278 if (!split_key_map(tmp, &handler, &arg))
1279 return;
1280 if (!strcmp(tmp, km_keyname(c))) {
1281 if (*handler == 'd') {
1282 display_cmd(arg);
1283 return;
1284 }
1285 if (*handler == 'x') {
1286 external_cmd(arg);
1287 return;
1288 }
1289 if (*handler == 'p') {
1290 client_cmd_cmdline(arg);
1291 return;
1292 }
1293 if (*handler == 'i') {
1294 int num = find_cmd_byname(arg);
1295 if (num >= 0)
1296 command_list[num].handler();
1297 return;
1298 }
1299 }
1300 }
1301 /* not found, check internal key bindings */
1302 for (i = 0; command_list[i].handler; i++) {
1303 if (!strcmp(km_keyname(c), command_list[i].key)) {
1304 command_list[i].handler();
1305 return;
1306 }
1307 }
1308 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1309 km_keyname(c));
1310 }
1311
1312 int main(int argc, char *argv[])
1313 {
1314 int ret;
1315 char *cf;
1316
1317 _argc = argc;
1318 _argv = argv;
1319
1320 if (cmdline_parser(argc, argv, &conf)) {
1321 fprintf(stderr, "parse error while reading command line\n");
1322 exit(EXIT_FAILURE);
1323 }
1324 init_theme(0, &theme);
1325 top.lines = theme.top_lines_default;
1326 if (check_key_map_args() < 0) {
1327 fprintf(stderr, "invalid key map\n");
1328 exit(EXIT_FAILURE);
1329 }
1330 cf = configfile_exists();
1331 if (!cf && conf.config_file_given) {
1332 fprintf(stderr, "can not read config file %s\n",
1333 conf.config_file_arg);
1334 exit(EXIT_FAILURE);
1335 }
1336 if (cf)
1337 cmdline_parser_configfile(cf, &conf, 0, 0, 0);
1338 if (check_key_map_args() < 0) {
1339 fprintf(stderr, "invalid key map in config file\n");
1340 exit(EXIT_FAILURE);
1341 }
1342 setup_signal_handling();
1343 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1344 initscr(); /* needed only once, always successful */
1345 init_curses();
1346 print_welcome();
1347 for (;;) {
1348 print_status_bar();
1349 ret = do_select(GETCH_MODE);
1350 if (!ret)
1351 continue;
1352 print_in_bar(COLOR_MSG, " ");
1353 handle_command(ret);
1354 }
1355 }