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