gui: Rename do_exit().
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2013 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file gui.c Curses-based interface for paraslash. */
8
9 #include <regex.h>
10 #include <signal.h>
11 #include <sys/types.h>
12 #include <curses.h>
13
14 #include "gui.cmdline.h"
15 #include "para.h"
16 #include "gui.h"
17 #include "string.h"
18 #include "ringbuffer.h"
19 #include "fd.h"
20 #include "error.h"
21 #include "list.h"
22 #include "sched.h"
23 #include "signal.h"
24 #include "version.h"
25
26 /** define the array of error lists needed by para_gui */
27 INIT_GUI_ERRLISTS;
28 static char *stat_content[NUM_STAT_ITEMS];
29
30 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
31
32 static int signal_pipe;
33
34 static struct win_data {
35 WINDOW *win;
36 size_t begx;
37 size_t begy;
38 size_t cols;
39 size_t lines;
40 } top, bot, sb, in, sep;
41
42 #define RINGBUFFER_SIZE 512
43 struct rb_entry {
44 char *msg;
45 size_t len;
46 int color;
47 };
48 static struct ringbuffer *bot_win_rb;
49 #define NUM_LINES(len) (1 + (len) / bot.cols)
50
51 static unsigned scroll_position;
52
53 static int curses_active;
54 static pid_t cmd_pid;
55
56 static int command_fds[2];
57 static int stat_pipe = -1;
58 static struct gui_args_info conf;
59
60 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
61
62
63 #define COLOR_STATUSBAR 52
64 #define COLOR_COMMAND 53
65 #define COLOR_OUTPUT 54
66 #define COLOR_MSG 55
67 #define COLOR_ERRMSG 56
68 #define COLOR_WELCOME 57
69 #define COLOR_SEPARATOR 58
70 #define COLOR_TOP 59
71 #define COLOR_BOT 60
72
73 struct gui_command {
74 const char *key;
75 const char *name;
76 const char *description;
77 void (*handler)(void);
78 };
79
80 struct stat_item {
81 char name[MAXLINE];
82 char prefix[MAXLINE];
83 char postfix[MAXLINE];
84 unsigned y;
85 unsigned x;
86 unsigned len;
87 int fg, bg;
88 int align;
89 char content[MAXLINE];
90 };
91
92 static struct gui_theme theme;
93
94 static int _argc;
95 static char **_argv;
96
97 static void com_help(void);
98 static void com_reread_conf(void);
99 static void com_enlarge_top_win(void);
100 static void com_shrink_top_win(void);
101 static void com_version(void);
102 __noreturn static void com_quit(void);
103 static void com_refresh(void);
104 static void com_ll_incr(void);
105 static void com_ll_decr(void);
106 static void com_prev_theme(void);
107 static void com_next_theme(void);
108 static void com_scroll_up(void);
109 static void com_scroll_down(void);
110 static void com_page_up(void);
111 static void com_page_down(void);
112 static void com_cancel_scrolling(void);
113 static void com_scroll_top(void);
114
115 static 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 .key = "<home>",
193 .name = "scroll_top",
194 .description = "scroll to top of buffer",
195 .handler = com_scroll_top
196 }, {
197 .key = "<end>",
198 .name = "cancel_scroll",
199 .description = "deactivate scroll mode",
200 .handler = com_cancel_scrolling
201 }, {
202 .handler = NULL
203 }
204 };
205
206 static int find_cmd_byname(char *name)
207 {
208 int i;
209
210 for (i = 0; command_list[i].handler; i++)
211 if (!strcmp(command_list[i].name, name))
212 return i;
213 return -1;
214 }
215
216 /* taken from mutt */
217 static char *km_keyname(int c)
218 {
219 static char buf[10];
220
221 if (c == KEY_UP) {
222 sprintf(buf, "<up>");
223 return buf;
224 }
225 if (c == KEY_DOWN) {
226 sprintf(buf, "<down>");
227 return buf;
228 }
229 if (c == KEY_LEFT) {
230 sprintf(buf, "<left>");
231 return buf;
232 }
233 if (c == KEY_RIGHT) {
234 sprintf(buf, "<right>");
235 return buf;
236 }
237 if (c == KEY_NPAGE) {
238 sprintf(buf, "<npage>");
239 return buf;
240 }
241 if (c == KEY_PPAGE) {
242 sprintf(buf, "<ppage>");
243 return buf;
244 }
245 if (c == KEY_HOME) {
246 sprintf(buf, "<home>");
247 return buf;
248 }
249 if (c == KEY_END) {
250 sprintf(buf, "<end>");
251 return buf;
252 }
253 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
254 if (c < 0)
255 c += 256;
256 if (c < 128) {
257 buf[0] = '^';
258 buf[1] = (c + '@') & 0x7f;
259 buf[2] = 0;
260 } else
261 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
262 (c >> 3) & 7, c & 7);
263 } else if (c >= KEY_F0 && c < KEY_F(256))
264 sprintf(buf, "<F%d>", c - KEY_F0);
265 else if (isprint(c))
266 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
267 else
268 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
269 return buf;
270 }
271
272 static char *configfile_exists(void)
273 {
274 static char *config_file;
275 char *tmp;
276
277 if (!conf.config_file_given) {
278 if (!config_file) {
279 char *home = para_homedir();
280 config_file = make_message("%s/.paraslash/gui.conf",
281 home);
282 free(home);
283 }
284 tmp = config_file;
285 } else
286 tmp = conf.config_file_arg;
287 return file_exists(tmp)? tmp: NULL;
288 }
289
290 /*
291 * print num spaces to curses window
292 */
293 static void add_spaces(WINDOW* win, unsigned int num)
294 {
295 while (num > 0) {
296 num--;
297 waddstr(win, " ");
298 }
299 }
300
301 /*
302 * print aligned string to curses window. This function always prints
303 * exactly len chars.
304 */
305 static int align_str(WINDOW* win, char *str, unsigned int len,
306 unsigned int align)
307 {
308 int i, num; /* of spaces */
309
310 if (!win || !str)
311 return -1;
312 num = len - strlen(str);
313 if (num < 0) {
314 str[len] = '\0';
315 num = 0;
316 }
317 /* replace control characters by spaces */
318 for (i = 0; i < len && str[i]; i++) {
319 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
320 str[i] = ' ';
321 }
322 if (align == LEFT) {
323 waddstr(win, str);
324 add_spaces(win, num);
325 } else if (align == RIGHT) {
326 add_spaces(win, num);
327 waddstr(win, str);
328 } else {
329 add_spaces(win, num / 2);
330 waddstr(win, str[0]? str: "");
331 add_spaces(win, num - num / 2);
332 }
333 return 1;
334 }
335
336 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
337 {
338 char *msg;
339 va_list ap;
340
341 if (!curses_active)
342 return;
343 wattron(in.win, COLOR_PAIR(color));
344 va_start(ap, fmt);
345 xvasprintf(&msg, fmt, ap);
346 va_end(ap);
347 wmove(in.win, 0, 0);
348 align_str(in.win, msg, sb.cols, LEFT);
349 free(msg);
350 wrefresh(in.win);
351 }
352
353 /*
354 * update the status bar
355 */
356 static void print_status_bar(void)
357 {
358 char *tmp;
359
360 if (!curses_active)
361 return;
362 tmp = para_strdup(STANDARD_STATUS_BAR);
363 wmove(sb.win, 0, 0);
364 align_str(sb.win, tmp, sb.cols, CENTER);
365 free(tmp);
366 wrefresh(sb.win);
367 }
368
369 /*
370 * get the number of the oldest rbe that is (partially) visible. On return,
371 * lines contains the sum of the number of lines of all visable entries. If the
372 * first one is only partially visible, lines is greater than bot.lines.
373 */
374 static int first_visible_rbe(unsigned *lines)
375 {
376 int i;
377 *lines = 0;
378 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
379 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
380 int rbe_lines;
381 if (!rbe)
382 return i - 1;
383 // fprintf(stderr, "found: %s\n", rbe->msg);
384 rbe_lines = NUM_LINES(rbe->len);
385 if (rbe_lines > bot.lines)
386 return -1;
387 *lines += rbe_lines;
388 if (*lines >= bot.lines)
389 return i;
390 }
391 return RINGBUFFER_SIZE - 1;
392 }
393
394 static int draw_top_rbe(unsigned *lines)
395 {
396 unsigned len;
397 int offset, fvr = first_visible_rbe(lines);
398 struct rb_entry *rbe;
399
400 if (fvr < 0)
401 return -1;
402 wmove(bot.win, 0, 0);
403 rbe = ringbuffer_get(bot_win_rb, fvr);
404 if (!rbe)
405 return -1;
406 len = strlen(rbe->msg);
407 if (*lines > bot.lines) {
408 /* first rbe is only partially visible */
409 offset = (*lines - bot.lines) * bot.cols;
410 assert(offset <= len);
411 } else
412 offset = 0;
413 wattron(bot.win, COLOR_PAIR(rbe->color));
414 waddstr(bot.win, rbe->msg + offset);
415 *lines = NUM_LINES(len - offset);
416 return fvr;
417 }
418
419 static void redraw_bot_win(void)
420 {
421 unsigned lines;
422 int i;
423
424 wmove(bot.win, 0, 0);
425 wclear(bot.win);
426 i = draw_top_rbe(&lines);
427 if (i <= 0)
428 goto out;
429 while (i > 0 && lines < bot.lines) {
430 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
431 if (!rbe) {
432 lines++;
433 waddstr(bot.win, "\n");
434 continue;
435 }
436 lines += NUM_LINES(rbe->len);
437 wattron(bot.win, COLOR_PAIR(rbe->color));
438 waddstr(bot.win, "\n");
439 waddstr(bot.win, rbe->msg);
440 }
441 out:
442 wrefresh(bot.win);
443 }
444
445 static void rb_add_entry(int color, char *msg)
446 {
447 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
448 int x, y;
449 new->color = color;
450 new->len = strlen(msg);
451 new->msg = msg;
452 old = ringbuffer_add(bot_win_rb, new);
453 // fprintf(stderr, "added: %s\n", new->msg);
454 if (old) {
455 free(old->msg);
456 free(old);
457 }
458 if (scroll_position) {
459 /* discard current scrolling, like xterm does */
460 scroll_position = 0;
461 redraw_bot_win();
462 return;
463 }
464 wattron(bot.win, COLOR_PAIR(color));
465 getyx(bot.win, y, x);
466 if (y || x)
467 waddstr(bot.win, "\n");
468 waddstr(bot.win, msg);
469 }
470
471 /*
472 * print formated output to bot win and refresh
473 */
474 __printf_2_3 static void outputf(int color, const char* fmt,...)
475 {
476 char *msg;
477 va_list ap;
478
479 if (!curses_active)
480 return;
481 va_start(ap, fmt);
482 xvasprintf(&msg, fmt, ap);
483 va_end(ap);
484 rb_add_entry(color, msg);
485 wrefresh(bot.win);
486 }
487
488 static int add_output_line(char *line, void *data)
489 {
490 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
491 if (!curses_active)
492 return 1;
493 rb_add_entry(color, para_strdup(line));
494 return 1;
495 }
496
497 static int loglevel;
498
499 __printf_2_3 void curses_log(int ll, const char *fmt,...)
500 {
501 int color;
502 char *msg;
503 va_list ap;
504
505 if (ll < loglevel || !curses_active)
506 return;
507 switch (ll) {
508 case LL_DEBUG:
509 case LL_INFO:
510 case LL_NOTICE:
511 color = COLOR_MSG;
512 break;
513 default:
514 color = COLOR_ERRMSG;
515 }
516 va_start(ap, fmt);
517 xvasprintf(&msg, fmt, ap);
518 va_end(ap);
519 chop(msg);
520 rb_add_entry(color, msg);
521 wrefresh(bot.win);
522 }
523 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
524
525 static void setup_signal_handling(void)
526 {
527 signal_pipe = para_signal_init();
528 para_install_sighandler(SIGINT);
529 para_install_sighandler(SIGTERM);
530 para_install_sighandler(SIGCHLD);
531 para_install_sighandler(SIGWINCH);
532 para_install_sighandler(SIGUSR1);
533 para_sigaction(SIGHUP, SIG_IGN);
534 }
535
536 /* kill every process in the process group and exit */
537 __noreturn static void kill_pg_and_die(int ret)
538 {
539 para_sigaction(SIGTERM, SIG_IGN);
540 kill(0, SIGTERM);
541 exit(ret);
542 }
543
544 static void shutdown_curses(void)
545 {
546 if (!curses_active)
547 return;
548 def_prog_mode();
549 curses_active = 0;
550 endwin();
551 }
552
553 __noreturn static void finish(int ret)
554 {
555 shutdown_curses();
556 kill_pg_and_die(ret);
557 }
558
559 /*
560 * exit curses and print given message to stdout/stderr
561 */
562 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
563 {
564 va_list argp;
565 FILE *outfd = ret? stderr: stdout;
566
567 shutdown_curses();
568 va_start(argp, fmt);
569 vfprintf(outfd, fmt, argp);
570 va_end(argp);
571 kill_pg_and_die(ret);
572 }
573
574 static void print_welcome(void)
575 {
576 if (loglevel > LL_NOTICE)
577 return;
578 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
579 " \"" CODENAME "\". Theme: %s", theme.name);
580 wclrtoeol(bot.win);
581 }
582
583 /*
584 * init all windows
585 */
586 static void init_wins(int top_lines)
587 {
588 int i;
589
590 top.lines = top_lines;
591 top.cols = COLS;
592 top.begy = 0;
593 top.begx = 0;
594
595 bot.lines = LINES - top.lines - 3;
596 bot.cols = COLS;
597 bot.begy = top.lines + 1;
598 bot.begx = 0;
599
600 sb.lines = 1;
601 sb.cols = COLS;
602 sb.begy = LINES - 2;
603 sb.begx = 0;
604
605 in.lines = 1;
606 in.cols = COLS;
607 in.begy = LINES - 1;
608 in.begx = 0;
609
610 sep.lines = 1;
611 sep.cols = COLS;
612 sep.begy = top.lines;
613 sep.begx = 0;
614
615 assume_default_colors(theme.default_fg, theme.default_bg);
616 if (top.win) {
617 mvwin(top.win, top.begy, top.begx);
618 wresize(top.win, top.lines, top.cols);
619
620 mvwin(sb.win, sb.begy, sb.begx);
621 wresize(sb.win, sb.lines, sb.cols);
622
623 mvwin(sep.win, sep.begy, sep.begx);
624 wresize(sep.win, sep.lines, sep.cols);
625
626 mvwin(bot.win, bot.begy, bot.begx);
627 wresize(bot.win, bot.lines, bot.cols);
628
629 mvwin(in.win, in.begy, in.begx);
630 wresize(in.win, in.lines, in.cols);
631 } else {
632 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
633 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
634 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
635 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
636 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
637 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
638 msg_n_exit(1, "Error: Cannot create curses windows\n");
639 wclear(bot.win);
640 wclear(sb.win);
641 wclear(in.win);
642 scrollok(bot.win, 1);
643 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
644 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
645 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
646 wattron(top.win, COLOR_PAIR(COLOR_TOP));
647 nodelay(top.win, 1);
648 nodelay(bot.win, 1);
649 nodelay(sb.win, 1);
650 nodelay(in.win, 0);
651
652 keypad(top.win, 1);
653 keypad(bot.win, 1);
654 keypad(sb.win, 1);
655 keypad(in.win, 1);
656 print_status_bar();
657 }
658 wmove(sep.win, 0, 0);
659 for (i = 1; i <= COLS; i++)
660 waddstr(sep.win, theme.sep_str);
661 wclear(top.win);
662 //wclear(bot.win);
663 wnoutrefresh(top.win);
664 wnoutrefresh(bot.win);
665 //wnoutrefresh(sb.win);
666 print_status_bar();
667 wnoutrefresh(in.win);
668 wnoutrefresh(sep.win);
669 doupdate();
670 }
671
672 /*
673 * Print stat item #i to curses window
674 */
675 static void print_stat_item(int i)
676 {
677 char *tmp;
678 struct stat_item_data d = theme.data[i];
679 char *c = stat_content[i];
680
681 if (!curses_active || !d.len || !c)
682 return;
683 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
684 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
685 wrefresh(top.win);
686 wattron(top.win, COLOR_PAIR(i + 1));
687 align_str(top.win, tmp, d.len * COLS / 100, d.align);
688 free(tmp);
689 wrefresh(top.win);
690 }
691
692 static int update_item(int item_num, char *buf)
693 {
694 char **c = stat_content + item_num;
695
696 free(*c);
697 if (buf && buf[0])
698 goto dup;
699 switch (item_num) {
700 case SI_ARTIST:
701 *c = para_strdup("(artist tag not set)");
702 goto print;
703 case SI_TITLE:
704 *c = para_strdup("(title tag not set)");
705 goto print;
706 case SI_YEAR:
707 *c = para_strdup("????");
708 goto print;
709 case SI_ALBUM:
710 *c = para_strdup("(album tag not set)");
711 goto print;
712 case SI_COMMENT:
713 *c = para_strdup("(comment tag not set)");
714 goto print;
715 }
716 dup:
717 *c = para_strdup(buf);
718 print:
719 print_stat_item(item_num);
720 return 1;
721 }
722
723 static int read_stat_pipe(fd_set *rfds)
724 {
725 static char *buf;
726 static int bufsize, loaded;
727 int ret, ret2;
728 size_t sz;
729
730 if (stat_pipe < 0)
731 return 0;
732 if (loaded >= bufsize) {
733 if (bufsize > 1000 * 1000) {
734 loaded = 0;
735 return 0;
736 }
737 bufsize += bufsize + 1000;
738 buf = para_realloc(buf, bufsize);
739 }
740 assert(loaded < bufsize);
741 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
742 rfds, &sz);
743 loaded += sz;
744 ret2 = for_each_stat_item(buf, loaded, update_item);
745 if (ret < 0 || ret2 < 0) {
746 loaded = 0;
747 return ret2 < 0? ret2 : ret;
748 }
749 sz = ret2; /* what is left */
750 if (sz > 0 && sz < loaded)
751 memmove(buf, buf + loaded - sz, sz);
752 loaded = sz;
753 return 1;
754 }
755
756 static void print_all_items(void)
757 {
758 int i;
759
760 if (!curses_active)
761 return;
762 FOR_EACH_STATUS_ITEM(i)
763 print_stat_item(i);
764 }
765
766 static void clear_all_items(void)
767 {
768 int i;
769
770 FOR_EACH_STATUS_ITEM(i) {
771 free(stat_content[i]);
772 stat_content[i] = para_strdup("");
773 }
774 }
775
776 static void init_pair_or_die(short pair, short f, short b)
777 {
778 if (init_pair(pair, f, b) == ERR)
779 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
780 }
781
782 static void init_colors_or_die(void)
783 {
784 int i;
785
786 if (!has_colors())
787 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
788 if (start_color() == ERR)
789 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
790 FOR_EACH_STATUS_ITEM(i)
791 if (theme.data[i].len)
792 init_pair_or_die(i + 1, theme.data[i].fg,
793 theme.data[i].bg);
794 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
795 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
796 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
797 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
798 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
799 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
800 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
801 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
802 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
803 }
804
805 /* (Re-)initialize the curses library. */
806 static void init_curses(void)
807 {
808 curses_active = 1;
809 if (top.win && refresh() == ERR) /* refesh is really needed */
810 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
811 if (LINES < theme.lines_min || COLS < theme.cols_min)
812 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
813 " (need at least %dx%d)\n", COLS, LINES,
814 theme.cols_min, theme.lines_min);
815 curs_set(0); /* make cursor invisible, ignore errors */
816 nonl(); /* do not NL->CR/NL on output, always returns OK */
817 /* don't echo input */
818 if (noecho() == ERR)
819 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
820 /* take input chars one at a time, no wait for \n */
821 if (cbreak() == ERR)
822 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
823 init_colors_or_die();
824 clear(); /* ignore non-fatal errors */
825 init_wins(theme.top_lines_default);
826 print_all_items();
827 // noecho(); /* don't echo input */
828 }
829
830 static void check_sigchld(void)
831 {
832 int ret;
833 pid_t pid;
834 reap_next_child:
835 ret = para_reap_child(&pid);
836 if (ret <= 0)
837 return;
838 if (pid == cmd_pid)
839 cmd_pid = 0;
840 goto reap_next_child;
841 }
842
843 /*
844 * This sucker modifies its first argument. *handler and *arg are
845 * pointers to 0-terminated strings (inside line). Crap.
846 */
847 static int split_key_map(char *line, char **handler, char **arg)
848 {
849 if (!(*handler = strchr(line + 1, ':')))
850 goto err_out;
851 **handler = '\0';
852 (*handler)++;
853 if (!(*arg = strchr(*handler, ':')))
854 goto err_out;
855 **arg = '\0';
856 (*arg)++;
857 return 1;
858 err_out:
859 return 0;
860 }
861
862 static int check_key_map_args(void)
863 {
864 char *s;
865 int i, ret = -1;
866 char *tmp = NULL, *handler, *arg;
867
868 for (i = 0; i < conf.key_map_given; ++i) {
869 s = conf.key_map_arg[i];
870 if (!(*s))
871 goto err_out;
872 free(tmp);
873 tmp = para_strdup(s);
874 if (!split_key_map(tmp, &handler, &arg))
875 goto err_out;
876 if (strlen(handler) != 1)
877 goto err_out;
878 if (*handler != 'x'
879 && *handler != 'd'
880 && *handler != 'i'
881 && *handler != 'p')
882 goto err_out;
883 if (*handler != 'i')
884 continue;
885 if (find_cmd_byname(arg) < 0)
886 goto err_out;
887 }
888 ret = 0;
889 err_out:
890 free(tmp);
891 return ret;
892 }
893
894 /*
895 * React to various signal-related events
896 */
897 static void handle_signal(int sig)
898 {
899 switch (sig) {
900 case SIGTERM:
901 msg_n_exit(EXIT_FAILURE,
902 "only the good die young (caught SIGTERM))\n");
903 return;
904 case SIGWINCH:
905 if (curses_active) {
906 shutdown_curses();
907 init_curses();
908 redraw_bot_win();
909 }
910 return;
911 case SIGINT:
912 PARA_WARNING_LOG("caught SIGINT, reset");
913 /* Nothing to do. SIGINT killed our child which gets noticed
914 * by do_select and resets everything.
915 */
916 return;
917 case SIGUSR1:
918 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
919 com_reread_conf();
920 return;
921 case SIGCHLD:
922 check_sigchld();
923 return;
924 }
925 }
926
927 static int open_stat_pipe(void)
928 {
929 static int init = 1;
930 int ret, fds[3] = {0, 1, 0};
931 pid_t pid;
932
933 if (init)
934 init = 0;
935 else
936 /*
937 * Sleep a bit to avoid a busy loop. As the call to sleep() may
938 * be interrupted by SIGCHLD, we simply wait until the call
939 * succeeds.
940 */
941 while (sleep(2))
942 ; /* nothing */
943 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
944 if (ret < 0)
945 return ret;
946 ret = mark_fd_nonblocking(fds[1]);
947 if (ret >= 0)
948 return fds[1];
949 close(fds[1]);
950 return ret;
951 }
952
953 #define COMMAND_BUF_SIZE 32768
954
955 /*
956 * This is the core select loop. Besides the (internal) signal
957 * pipe, the following other fds are checked according to the mode:
958 *
959 * GETCH_MODE: check stdin, return when key is pressed
960 *
961 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
962 * stdout and stderr or when any key is pressed.
963 *
964 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
965 * is running. During that time curses is disabled. Returns when
966 * cmd_pid == 0.
967 */
968 static int do_select(int mode)
969 {
970 fd_set rfds;
971 int ret, i, max_fileno;
972 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
973 int cbo[2] = {0, 0}; /* command buf offsets */
974 struct timeval tv;
975
976 repeat:
977 tv.tv_sec = conf.timeout_arg / 1000;
978 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
979 // ret = refresh_status();
980 FD_ZERO(&rfds);
981 max_fileno = 0;
982 if (stat_pipe < 0)
983 stat_pipe = open_stat_pipe();
984 if (stat_pipe >= 0)
985 para_fd_set(stat_pipe, &rfds, &max_fileno);
986 /* signal pipe */
987 para_fd_set(signal_pipe, &rfds, &max_fileno);
988 /* command pipe only for COMMAND_MODE */
989 if (mode == COMMAND_MODE) {
990 if (command_fds[0] >= 0)
991 para_fd_set(command_fds[0], &rfds, &max_fileno);
992 if (command_fds[1] >= 0)
993 para_fd_set(command_fds[1], &rfds, &max_fileno);
994 }
995 if (mode == GETCH_MODE || mode == COMMAND_MODE)
996 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
997 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
998 if (ret <= 0)
999 goto check_return; /* skip fd checks */
1000 /* signals */
1001 ret = para_next_signal(&rfds);
1002 if (ret > 0)
1003 handle_signal(ret);
1004 /* read command pipe if ready */
1005 if (mode == COMMAND_MODE) {
1006 for (i = 0; i < 2; i++) {
1007 size_t sz;
1008 if (command_fds[i] < 0)
1009 continue;
1010 ret = read_nonblock(command_fds[i],
1011 command_buf[i] + cbo[i],
1012 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1013 cbo[i] += sz;
1014 sz = cbo[i];
1015 cbo[i] = for_each_line(command_buf[i], cbo[i],
1016 add_output_line, &i);
1017 if (sz != cbo[i])
1018 wrefresh(bot.win);
1019 if (ret < 0) {
1020 PARA_NOTICE_LOG("closing command fd %d: %s",
1021 i, para_strerror(-ret));
1022 close(command_fds[i]);
1023 command_fds[i] = -1;
1024 if (command_fds[!i] < 0) /* both fds closed */
1025 return 0;
1026 }
1027 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1028 PARA_NOTICE_LOG("discarding overlong line");
1029 cbo[i] = 0;
1030 }
1031 }
1032 }
1033 ret = read_stat_pipe(&rfds);
1034 if (ret < 0) {
1035 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1036 close(stat_pipe);
1037 stat_pipe = -1;
1038 clear_all_items();
1039 free(stat_content[SI_BASENAME]);
1040 stat_content[SI_BASENAME] =
1041 para_strdup("stat command terminated!?");
1042 print_all_items();
1043 }
1044 check_return:
1045 switch (mode) {
1046 case COMMAND_MODE:
1047 ret = wgetch(top.win);
1048 if (ret != ERR && ret != KEY_RESIZE) {
1049 if (command_fds[0] >= 0) {
1050 close(command_fds[0]);
1051 command_fds[0] = -1;
1052 }
1053 if (command_fds[1] >= 0) {
1054 close(command_fds[1]);
1055 command_fds[1] = -1;
1056 }
1057 if (cmd_pid)
1058 kill(cmd_pid, SIGTERM);
1059 return -1;
1060 }
1061 break;
1062 case GETCH_MODE:
1063 ret = wgetch(top.win);
1064 if (ret != ERR && ret != KEY_RESIZE)
1065 return ret;
1066 break;
1067 case EXTERNAL_MODE:
1068 if (cmd_pid == 0)
1069 return 0;
1070 }
1071 goto repeat;
1072 }
1073
1074 /*
1075 * read from command pipe and print data to bot window
1076 */
1077 static void send_output(void)
1078 {
1079 int ret;
1080
1081 ret = mark_fd_nonblocking(command_fds[0]);
1082 if (ret < 0)
1083 goto fail;
1084 ret = mark_fd_nonblocking(command_fds[1]);
1085 if (ret < 0)
1086 goto fail;
1087 if (do_select(COMMAND_MODE) >= 0)
1088 PARA_INFO_LOG("command complete");
1089 else
1090 PARA_NOTICE_LOG("command aborted");
1091 print_in_bar(COLOR_MSG, " ");
1092 return;
1093 fail:
1094 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1095 close(command_fds[0]);
1096 close(command_fds[1]);
1097 }
1098
1099 static void para_cmd(char *cmd)
1100 {
1101 int ret, fds[3] = {0, 1, 1};
1102 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1103
1104 outputf(COLOR_COMMAND, "%s", c);
1105 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1106 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1107 free(c);
1108 if (ret < 0)
1109 return;
1110 command_fds[0] = fds[1];
1111 command_fds[1] = fds[2];
1112 send_output();
1113 }
1114
1115 /*
1116 * exec command and print output to bot win
1117 */
1118 static void display_cmd(char *cmd)
1119 {
1120 int fds[3] = {0, 1, 1};
1121
1122 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1123 outputf(COLOR_COMMAND, "%s", cmd);
1124 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1125 return;
1126 command_fds[0] = fds[1];
1127 command_fds[1] = fds[2];
1128 send_output();
1129 }
1130
1131 /*
1132 * shutdown curses and stat pipe before executing external commands
1133 */
1134 static void external_cmd(char *cmd)
1135 {
1136 int fds[3] = {-1, -1, -1};
1137
1138 if (cmd_pid)
1139 return;
1140 shutdown_curses();
1141 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1142 return;
1143 do_select(EXTERNAL_MODE);
1144 init_curses();
1145 }
1146
1147 static void print_scroll_msg(void)
1148 {
1149 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1150 int first_rbe = first_visible_rbe(&lines_total);
1151 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1152 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1153 }
1154
1155 static void com_scroll_top(void)
1156 {
1157 int i = RINGBUFFER_SIZE - 1;
1158 unsigned lines = 0;
1159
1160 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1161 i--;
1162 /* i is oldest entry */
1163 for (; lines < bot.lines && i >= 0; i--) {
1164 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1165 if (!rbe)
1166 break;
1167 lines += NUM_LINES(strlen(rbe->msg));
1168 }
1169 i++;
1170 if (lines > 0 && scroll_position != i) {
1171 scroll_position = i;
1172 redraw_bot_win();
1173 print_scroll_msg();
1174 return;
1175 }
1176 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1177 }
1178
1179 static void com_cancel_scrolling(void)
1180 {
1181
1182 if (scroll_position == 0) {
1183 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1184 return;
1185 }
1186 scroll_position = 0;
1187 redraw_bot_win();
1188 }
1189
1190 static void com_page_down(void)
1191 {
1192 unsigned lines = 0;
1193 int i = scroll_position;
1194 while (lines < bot.lines && --i > 0) {
1195 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1196 if (!rbe)
1197 break;
1198 lines += NUM_LINES(strlen(rbe->msg));
1199 }
1200 if (lines) {
1201 scroll_position = i;
1202 redraw_bot_win();
1203 print_scroll_msg();
1204 return;
1205 }
1206 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1207 }
1208
1209 static void com_page_up(void)
1210 {
1211 unsigned lines;
1212 int fvr = first_visible_rbe(&lines);
1213
1214 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1215 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1216 return;
1217 }
1218 scroll_position = fvr + 1;
1219 for (; scroll_position > 0; scroll_position--) {
1220 first_visible_rbe(&lines);
1221 if (lines == bot.lines)
1222 break;
1223 }
1224 redraw_bot_win();
1225 print_scroll_msg();
1226 }
1227
1228 static void com_scroll_down(void)
1229 {
1230 struct rb_entry *rbe;
1231 int rbe_lines;
1232
1233 if (!scroll_position) {
1234 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1235 return;
1236 }
1237 scroll_position--;
1238 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1239 rbe_lines = NUM_LINES(rbe->len);
1240 wscrl(bot.win, rbe_lines);
1241 wmove(bot.win, bot.lines - rbe_lines, 0);
1242 wattron(bot.win, COLOR_PAIR(rbe->color));
1243 waddstr(bot.win, rbe->msg);
1244 wrefresh(bot.win);
1245 print_scroll_msg();
1246 }
1247
1248 static void com_scroll_up(void)
1249 {
1250 struct rb_entry *rbe = NULL;
1251 unsigned lines;
1252 int i, first_rbe, num_scroll;
1253
1254 /* the entry that is going to vanish */
1255 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1256 if (!rbe)
1257 goto err_out;
1258 num_scroll = NUM_LINES(rbe->len);
1259 first_rbe = first_visible_rbe(&lines);
1260 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1261 goto err_out;
1262 scroll_position++;
1263 wscrl(bot.win, -num_scroll);
1264 i = draw_top_rbe(&lines);
1265 if (i < 0)
1266 goto err_out;
1267 while (i > 0 && lines < num_scroll) {
1268 int rbe_lines;
1269 rbe = ringbuffer_get(bot_win_rb, --i);
1270 if (!rbe)
1271 break;
1272 rbe_lines = NUM_LINES(rbe->len);
1273 lines += rbe_lines;
1274 // fprintf(stderr, "msg: %s\n", rbe->msg);
1275 wattron(bot.win, COLOR_PAIR(rbe->color));
1276 waddstr(bot.win, "\n");
1277 waddstr(bot.win, rbe->msg);
1278 if (!i)
1279 break;
1280 i--;
1281 }
1282 wrefresh(bot.win);
1283 print_scroll_msg();
1284 return;
1285 err_out:
1286 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1287 }
1288
1289 static void com_ll_decr(void)
1290 {
1291 if (loglevel <= LL_DEBUG) {
1292 print_in_bar(COLOR_ERRMSG,
1293 "loglevel already at maximal verbosity\n");
1294 return;
1295 }
1296 loglevel--;
1297 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1298 }
1299
1300 static void com_ll_incr(void)
1301 {
1302 if (loglevel >= LL_EMERG) {
1303 print_in_bar(COLOR_ERRMSG,
1304 "loglevel already at minimal verbosity\n");
1305 return;
1306 }
1307 loglevel++;
1308 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1309 }
1310
1311 /*
1312 * reread configuration, terminate on errors
1313 */
1314 static void com_reread_conf(void)
1315 {
1316 char *cf =configfile_exists();
1317 struct gui_cmdline_parser_params params = {
1318 .override = 1,
1319 .initialize = 1,
1320 .check_required = 0,
1321 .check_ambiguity = 0,
1322 .print_errors = 0,
1323 };
1324
1325 if (!cf) {
1326 PARA_WARNING_LOG("there is no configuration to read");
1327 return;
1328 }
1329 PARA_INFO_LOG("rereading command line options and config file");
1330 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1331 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1332 PARA_EMERG_LOG("errors in config file");
1333 finish(EXIT_FAILURE);
1334 }
1335 PARA_NOTICE_LOG("config file reloaded");
1336 if (check_key_map_args() < 0)
1337 finish(EXIT_FAILURE);
1338 }
1339
1340 static void com_help(void)
1341 {
1342 int i;
1343
1344 for (i = 0; i < conf.key_map_given; ++i) {
1345 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1346 const char *handler_text = "???", *desc = NULL;
1347
1348 if (!split_key_map(tmp, &handler, &arg)) {
1349 free(tmp);
1350 return;
1351 }
1352 switch (*handler) {
1353 case 'i':
1354 handler_text = "internal";
1355 desc = command_list[find_cmd_byname(arg)].description;
1356 break;
1357 case 'x': handler_text = "external"; break;
1358 case 'd': handler_text = "display "; break;
1359 case 'p': handler_text = "para "; break;
1360 }
1361 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1362 strlen(arg) < 8? "\t" : "",
1363 desc? desc : "");
1364 free(tmp);
1365 }
1366 for (i = 0; command_list[i].handler; i++) {
1367 struct gui_command gc = command_list[i];
1368
1369 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1370 strlen(gc.name) < 8? "\t" : "",
1371 gc.description);
1372 }
1373 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1374 "for more info");
1375 }
1376
1377 static void com_shrink_top_win(void)
1378 {
1379 if (top.lines <= theme.top_lines_min) {
1380 PARA_WARNING_LOG("can not decrease top window");
1381 return;
1382 }
1383 init_wins(top.lines - 1);
1384 wclear(top.win);
1385 print_all_items();
1386 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1387 }
1388
1389 static void com_enlarge_top_win(void)
1390 {
1391 if (bot.lines < 3) {
1392 PARA_WARNING_LOG("can not increase top window");
1393 return;
1394 }
1395 init_wins(top.lines + 1);
1396 wclear(top.win);
1397 print_all_items();
1398 print_in_bar(COLOR_MSG, "increased top window");
1399 }
1400
1401 static void com_version(void)
1402 {
1403 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1404 CODENAME "\"");
1405 }
1406
1407 __noreturn static void com_quit(void)
1408 {
1409 finish(0);
1410 }
1411
1412 static void com_refresh(void)
1413 {
1414 shutdown_curses();
1415 init_curses();
1416 }
1417
1418 static void change_theme(int next)
1419 {
1420 if (next)
1421 next_theme(&theme);
1422 else
1423 prev_theme(&theme);
1424 /* This seems to be needed twice, why? */
1425 com_refresh();
1426 com_refresh();
1427 PARA_NOTICE_LOG("new theme: %s", theme.name);
1428 }
1429
1430 static void com_next_theme(void)
1431 {
1432 change_theme(1);
1433 }
1434
1435 static void com_prev_theme(void)
1436 {
1437 change_theme(0);
1438 }
1439
1440
1441 static void handle_command(int c)
1442 {
1443 int i;
1444
1445 /* first check user's key bindings */
1446 for (i = 0; i < conf.key_map_given; ++i) {
1447 char *tmp, *handler, *arg;
1448
1449 tmp = para_strdup(conf.key_map_arg[i]);
1450 if (!split_key_map(tmp, &handler, &arg)) {
1451 free(tmp);
1452 return;
1453 }
1454 if (strcmp(tmp, km_keyname(c))) {
1455 free(tmp);
1456 continue;
1457 }
1458 if (*handler == 'd')
1459 display_cmd(arg);
1460 else if (*handler == 'x')
1461 external_cmd(arg);
1462 else if (*handler == 'p')
1463 para_cmd(arg);
1464 else if (*handler == 'i') {
1465 int num = find_cmd_byname(arg);
1466 if (num >= 0)
1467 command_list[num].handler();
1468 }
1469 free(tmp);
1470 return;
1471 }
1472 /* not found, check internal key bindings */
1473 for (i = 0; command_list[i].handler; i++) {
1474 if (!strcmp(km_keyname(c), command_list[i].key)) {
1475 command_list[i].handler();
1476 return;
1477 }
1478 }
1479 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1480 km_keyname(c));
1481 }
1482
1483 int main(int argc, char *argv[])
1484 {
1485 int ret;
1486 char *cf;
1487
1488 _argc = argc;
1489 _argv = argv;
1490
1491 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1492 HANDLE_VERSION_FLAG("gui", conf);
1493 cf = configfile_exists();
1494 if (!cf && conf.config_file_given) {
1495 fprintf(stderr, "can not read config file %s\n",
1496 conf.config_file_arg);
1497 exit(EXIT_FAILURE);
1498 }
1499 if (cf) {
1500 struct gui_cmdline_parser_params params = {
1501 .override = 0,
1502 .initialize = 0,
1503 .check_required = 0,
1504 .check_ambiguity = 0,
1505 .print_errors = 1,
1506 };
1507 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1508 exit(EXIT_FAILURE);
1509 }
1510 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1511 if (check_key_map_args() < 0) {
1512 fprintf(stderr, "invalid key map\n");
1513 exit(EXIT_FAILURE);
1514 }
1515 init_theme_or_die(conf.theme_arg, &theme);
1516 top.lines = theme.top_lines_default;
1517 setup_signal_handling();
1518 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1519 initscr(); /* needed only once, always successful */
1520 init_curses();
1521 print_welcome();
1522 for (;;) {
1523 print_status_bar();
1524 ret = do_select(GETCH_MODE);
1525 if (!ret)
1526 continue;
1527 print_in_bar(COLOR_MSG, " ");
1528 handle_command(ret);
1529 }
1530 }