68a271a898a49a82f6499bd145cd9956e1c4a5f3
[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 __noreturn static void do_exit(int ret)
537 {
538 para_sigaction(SIGTERM, SIG_IGN);
539 kill(0, SIGTERM);
540 exit(ret);
541 }
542
543 static void shutdown_curses(void)
544 {
545 if (!curses_active)
546 return;
547 def_prog_mode();
548 curses_active = 0;
549 endwin();
550 }
551
552 __noreturn static void finish(int ret)
553 {
554 shutdown_curses();
555 do_exit(ret);
556 }
557
558 /*
559 * exit curses and print given message to stdout/stderr
560 */
561 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
562 {
563 va_list argp;
564 FILE *outfd = ret? stderr: stdout;
565
566 shutdown_curses();
567 va_start(argp, fmt);
568 vfprintf(outfd, fmt, argp);
569 va_end(argp);
570 do_exit(ret);
571 }
572
573 static void print_welcome(void)
574 {
575 if (loglevel > LL_NOTICE)
576 return;
577 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
578 " \"" CODENAME "\". Theme: %s", theme.name);
579 wclrtoeol(bot.win);
580 }
581
582 /*
583 * init all windows
584 */
585 static void init_wins(int top_lines)
586 {
587 int i;
588
589 top.lines = top_lines;
590 top.cols = COLS;
591 top.begy = 0;
592 top.begx = 0;
593
594 bot.lines = LINES - top.lines - 3;
595 bot.cols = COLS;
596 bot.begy = top.lines + 1;
597 bot.begx = 0;
598
599 sb.lines = 1;
600 sb.cols = COLS;
601 sb.begy = LINES - 2;
602 sb.begx = 0;
603
604 in.lines = 1;
605 in.cols = COLS;
606 in.begy = LINES - 1;
607 in.begx = 0;
608
609 sep.lines = 1;
610 sep.cols = COLS;
611 sep.begy = top.lines;
612 sep.begx = 0;
613
614 assume_default_colors(theme.default_fg, theme.default_bg);
615 if (top.win) {
616 mvwin(top.win, top.begy, top.begx);
617 wresize(top.win, top.lines, top.cols);
618
619 mvwin(sb.win, sb.begy, sb.begx);
620 wresize(sb.win, sb.lines, sb.cols);
621
622 mvwin(sep.win, sep.begy, sep.begx);
623 wresize(sep.win, sep.lines, sep.cols);
624
625 mvwin(bot.win, bot.begy, bot.begx);
626 wresize(bot.win, bot.lines, bot.cols);
627
628 mvwin(in.win, in.begy, in.begx);
629 wresize(in.win, in.lines, in.cols);
630 } else {
631 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
632 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
633 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
634 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
635 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
636 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
637 msg_n_exit(1, "Error: Cannot create curses windows\n");
638 wclear(bot.win);
639 wclear(sb.win);
640 wclear(in.win);
641 scrollok(bot.win, 1);
642 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
643 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
644 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
645 wattron(top.win, COLOR_PAIR(COLOR_TOP));
646 nodelay(top.win, 1);
647 nodelay(bot.win, 1);
648 nodelay(sb.win, 1);
649 nodelay(in.win, 0);
650
651 keypad(top.win, 1);
652 keypad(bot.win, 1);
653 keypad(sb.win, 1);
654 keypad(in.win, 1);
655 print_status_bar();
656 }
657 wmove(sep.win, 0, 0);
658 for (i = 1; i <= COLS; i++)
659 waddstr(sep.win, theme.sep_str);
660 wclear(top.win);
661 //wclear(bot.win);
662 wnoutrefresh(top.win);
663 wnoutrefresh(bot.win);
664 //wnoutrefresh(sb.win);
665 print_status_bar();
666 wnoutrefresh(in.win);
667 wnoutrefresh(sep.win);
668 doupdate();
669 }
670
671 /*
672 * Print stat item #i to curses window
673 */
674 static void print_stat_item(int i)
675 {
676 char *tmp;
677 struct stat_item_data d = theme.data[i];
678 char *c = stat_content[i];
679
680 if (!curses_active || !d.len || !c)
681 return;
682 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
683 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
684 wrefresh(top.win);
685 wattron(top.win, COLOR_PAIR(i + 1));
686 align_str(top.win, tmp, d.len * COLS / 100, d.align);
687 free(tmp);
688 wrefresh(top.win);
689 }
690
691 static int update_item(int item_num, char *buf)
692 {
693 char **c = stat_content + item_num;
694
695 free(*c);
696 if (buf && buf[0])
697 goto dup;
698 switch (item_num) {
699 case SI_ARTIST:
700 *c = para_strdup("(artist tag not set)");
701 goto print;
702 case SI_TITLE:
703 *c = para_strdup("(title tag not set)");
704 goto print;
705 case SI_YEAR:
706 *c = para_strdup("????");
707 goto print;
708 case SI_ALBUM:
709 *c = para_strdup("(album tag not set)");
710 goto print;
711 case SI_COMMENT:
712 *c = para_strdup("(comment tag not set)");
713 goto print;
714 }
715 dup:
716 *c = para_strdup(buf);
717 print:
718 print_stat_item(item_num);
719 return 1;
720 }
721
722 static int read_stat_pipe(fd_set *rfds)
723 {
724 static char *buf;
725 static int bufsize, loaded;
726 int ret, ret2;
727 size_t sz;
728
729 if (stat_pipe < 0)
730 return 0;
731 if (loaded >= bufsize) {
732 if (bufsize > 1000 * 1000) {
733 loaded = 0;
734 return 0;
735 }
736 bufsize += bufsize + 1000;
737 buf = para_realloc(buf, bufsize);
738 }
739 assert(loaded < bufsize);
740 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
741 rfds, &sz);
742 loaded += sz;
743 ret2 = for_each_stat_item(buf, loaded, update_item);
744 if (ret < 0 || ret2 < 0) {
745 loaded = 0;
746 return ret2 < 0? ret2 : ret;
747 }
748 sz = ret2; /* what is left */
749 if (sz > 0 && sz < loaded)
750 memmove(buf, buf + loaded - sz, sz);
751 loaded = sz;
752 return 1;
753 }
754
755 static void print_all_items(void)
756 {
757 int i;
758
759 if (!curses_active)
760 return;
761 FOR_EACH_STATUS_ITEM(i)
762 print_stat_item(i);
763 }
764
765 static void clear_all_items(void)
766 {
767 int i;
768
769 FOR_EACH_STATUS_ITEM(i) {
770 free(stat_content[i]);
771 stat_content[i] = para_strdup("");
772 }
773 }
774
775 static void init_pair_or_die(short pair, short f, short b)
776 {
777 if (init_pair(pair, f, b) == ERR)
778 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
779 }
780
781 static void init_colors_or_die(void)
782 {
783 int i;
784
785 if (!has_colors())
786 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
787 if (start_color() == ERR)
788 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
789 FOR_EACH_STATUS_ITEM(i)
790 if (theme.data[i].len)
791 init_pair_or_die(i + 1, theme.data[i].fg,
792 theme.data[i].bg);
793 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
794 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
795 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
796 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
797 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
798 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
799 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
800 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
801 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
802 }
803
804 /* (Re-)initialize the curses library. */
805 static void init_curses(void)
806 {
807 curses_active = 1;
808 if (top.win && refresh() == ERR) /* refesh is really needed */
809 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
810 if (LINES < theme.lines_min || COLS < theme.cols_min)
811 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
812 " (need at least %dx%d)\n", COLS, LINES,
813 theme.cols_min, theme.lines_min);
814 curs_set(0); /* make cursor invisible, ignore errors */
815 nonl(); /* do not NL->CR/NL on output, always returns OK */
816 /* don't echo input */
817 if (noecho() == ERR)
818 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
819 /* take input chars one at a time, no wait for \n */
820 if (cbreak() == ERR)
821 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
822 init_colors_or_die();
823 clear(); /* ignore non-fatal errors */
824 init_wins(theme.top_lines_default);
825 print_all_items();
826 // noecho(); /* don't echo input */
827 }
828
829 static void check_sigchld(void)
830 {
831 int ret;
832 pid_t pid;
833 reap_next_child:
834 ret = para_reap_child(&pid);
835 if (ret <= 0)
836 return;
837 if (pid == cmd_pid)
838 cmd_pid = 0;
839 goto reap_next_child;
840 }
841
842 /*
843 * This sucker modifies its first argument. *handler and *arg are
844 * pointers to 0-terminated strings (inside line). Crap.
845 */
846 static int split_key_map(char *line, char **handler, char **arg)
847 {
848 if (!(*handler = strchr(line + 1, ':')))
849 goto err_out;
850 **handler = '\0';
851 (*handler)++;
852 if (!(*arg = strchr(*handler, ':')))
853 goto err_out;
854 **arg = '\0';
855 (*arg)++;
856 return 1;
857 err_out:
858 return 0;
859 }
860
861 static int check_key_map_args(void)
862 {
863 char *s;
864 int i, ret = -1;
865 char *tmp = NULL, *handler, *arg;
866
867 for (i = 0; i < conf.key_map_given; ++i) {
868 s = conf.key_map_arg[i];
869 if (!(*s))
870 goto err_out;
871 free(tmp);
872 tmp = para_strdup(s);
873 if (!split_key_map(tmp, &handler, &arg))
874 goto err_out;
875 if (strlen(handler) != 1)
876 goto err_out;
877 if (*handler != 'x'
878 && *handler != 'd'
879 && *handler != 'i'
880 && *handler != 'p')
881 goto err_out;
882 if (*handler != 'i')
883 continue;
884 if (find_cmd_byname(arg) < 0)
885 goto err_out;
886 }
887 ret = 0;
888 err_out:
889 free(tmp);
890 return ret;
891 }
892
893 /*
894 * React to various signal-related events
895 */
896 static void handle_signal(int sig)
897 {
898 switch (sig) {
899 case SIGTERM:
900 msg_n_exit(EXIT_FAILURE,
901 "only the good die young (caught SIGTERM))\n");
902 return;
903 case SIGWINCH:
904 if (curses_active) {
905 shutdown_curses();
906 init_curses();
907 redraw_bot_win();
908 }
909 return;
910 case SIGINT:
911 PARA_WARNING_LOG("caught SIGINT, reset");
912 /* Nothing to do. SIGINT killed our child which gets noticed
913 * by do_select and resets everything.
914 */
915 return;
916 case SIGUSR1:
917 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
918 com_reread_conf();
919 return;
920 case SIGCHLD:
921 check_sigchld();
922 return;
923 }
924 }
925
926 static int open_stat_pipe(void)
927 {
928 static int init = 1;
929 int ret, fds[3] = {0, 1, 0};
930 pid_t pid;
931
932 if (init)
933 init = 0;
934 else
935 /*
936 * Sleep a bit to avoid a busy loop. As the call to sleep() may
937 * be interrupted by SIGCHLD, we simply wait until the call
938 * succeeds.
939 */
940 while (sleep(2))
941 ; /* nothing */
942 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
943 if (ret < 0)
944 return ret;
945 ret = mark_fd_nonblocking(fds[1]);
946 if (ret >= 0)
947 return fds[1];
948 close(fds[1]);
949 return ret;
950 }
951
952 #define COMMAND_BUF_SIZE 32768
953
954 /*
955 * This is the core select loop. Besides the (internal) signal
956 * pipe, the following other fds are checked according to the mode:
957 *
958 * GETCH_MODE: check stdin, return when key is pressed
959 *
960 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
961 * stdout and stderr or when any key is pressed.
962 *
963 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
964 * is running. During that time curses is disabled. Returns when
965 * cmd_pid == 0.
966 */
967 static int do_select(int mode)
968 {
969 fd_set rfds;
970 int ret, i, max_fileno;
971 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
972 int cbo[2] = {0, 0}; /* command buf offsets */
973 struct timeval tv;
974
975 repeat:
976 tv.tv_sec = conf.timeout_arg / 1000;
977 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
978 // ret = refresh_status();
979 FD_ZERO(&rfds);
980 max_fileno = 0;
981 if (stat_pipe < 0)
982 stat_pipe = open_stat_pipe();
983 if (stat_pipe >= 0)
984 para_fd_set(stat_pipe, &rfds, &max_fileno);
985 /* signal pipe */
986 para_fd_set(signal_pipe, &rfds, &max_fileno);
987 /* command pipe only for COMMAND_MODE */
988 if (mode == COMMAND_MODE) {
989 if (command_fds[0] >= 0)
990 para_fd_set(command_fds[0], &rfds, &max_fileno);
991 if (command_fds[1] >= 0)
992 para_fd_set(command_fds[1], &rfds, &max_fileno);
993 }
994 if (mode == GETCH_MODE || mode == COMMAND_MODE)
995 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
996 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
997 if (ret <= 0)
998 goto check_return; /* skip fd checks */
999 /* signals */
1000 ret = para_next_signal(&rfds);
1001 if (ret > 0)
1002 handle_signal(ret);
1003 /* read command pipe if ready */
1004 if (mode == COMMAND_MODE) {
1005 for (i = 0; i < 2; i++) {
1006 size_t sz;
1007 if (command_fds[i] < 0)
1008 continue;
1009 ret = read_nonblock(command_fds[i],
1010 command_buf[i] + cbo[i],
1011 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1012 cbo[i] += sz;
1013 sz = cbo[i];
1014 cbo[i] = for_each_line(command_buf[i], cbo[i],
1015 add_output_line, &i);
1016 if (sz != cbo[i])
1017 wrefresh(bot.win);
1018 if (ret < 0) {
1019 PARA_NOTICE_LOG("closing command fd %d: %s",
1020 i, para_strerror(-ret));
1021 close(command_fds[i]);
1022 command_fds[i] = -1;
1023 if (command_fds[!i] < 0) /* both fds closed */
1024 return 0;
1025 }
1026 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1027 PARA_NOTICE_LOG("discarding overlong line");
1028 cbo[i] = 0;
1029 }
1030 }
1031 }
1032 ret = read_stat_pipe(&rfds);
1033 if (ret < 0) {
1034 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1035 close(stat_pipe);
1036 stat_pipe = -1;
1037 clear_all_items();
1038 free(stat_content[SI_BASENAME]);
1039 stat_content[SI_BASENAME] =
1040 para_strdup("stat command terminated!?");
1041 print_all_items();
1042 }
1043 check_return:
1044 switch (mode) {
1045 case COMMAND_MODE:
1046 ret = wgetch(top.win);
1047 if (ret != ERR && ret != KEY_RESIZE) {
1048 if (command_fds[0] >= 0) {
1049 close(command_fds[0]);
1050 command_fds[0] = -1;
1051 }
1052 if (command_fds[1] >= 0) {
1053 close(command_fds[1]);
1054 command_fds[1] = -1;
1055 }
1056 if (cmd_pid)
1057 kill(cmd_pid, SIGTERM);
1058 return -1;
1059 }
1060 break;
1061 case GETCH_MODE:
1062 ret = wgetch(top.win);
1063 if (ret != ERR && ret != KEY_RESIZE)
1064 return ret;
1065 break;
1066 case EXTERNAL_MODE:
1067 if (cmd_pid == 0)
1068 return 0;
1069 }
1070 goto repeat;
1071 }
1072
1073 /*
1074 * read from command pipe and print data to bot window
1075 */
1076 static void send_output(void)
1077 {
1078 int ret;
1079
1080 ret = mark_fd_nonblocking(command_fds[0]);
1081 if (ret < 0)
1082 goto fail;
1083 ret = mark_fd_nonblocking(command_fds[1]);
1084 if (ret < 0)
1085 goto fail;
1086 if (do_select(COMMAND_MODE) >= 0)
1087 PARA_INFO_LOG("command complete");
1088 else
1089 PARA_NOTICE_LOG("command aborted");
1090 print_in_bar(COLOR_MSG, " ");
1091 return;
1092 fail:
1093 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1094 close(command_fds[0]);
1095 close(command_fds[1]);
1096 }
1097
1098 static void para_cmd(char *cmd)
1099 {
1100 int ret, fds[3] = {0, 1, 1};
1101 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1102
1103 outputf(COLOR_COMMAND, "%s", c);
1104 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1105 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1106 free(c);
1107 if (ret < 0)
1108 return;
1109 command_fds[0] = fds[1];
1110 command_fds[1] = fds[2];
1111 send_output();
1112 }
1113
1114 /*
1115 * exec command and print output to bot win
1116 */
1117 static void display_cmd(char *cmd)
1118 {
1119 int fds[3] = {0, 1, 1};
1120
1121 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1122 outputf(COLOR_COMMAND, "%s", cmd);
1123 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1124 return;
1125 command_fds[0] = fds[1];
1126 command_fds[1] = fds[2];
1127 send_output();
1128 }
1129
1130 /*
1131 * shutdown curses and stat pipe before executing external commands
1132 */
1133 static void external_cmd(char *cmd)
1134 {
1135 int fds[3] = {-1, -1, -1};
1136
1137 if (cmd_pid)
1138 return;
1139 shutdown_curses();
1140 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1141 return;
1142 do_select(EXTERNAL_MODE);
1143 init_curses();
1144 }
1145
1146 static void print_scroll_msg(void)
1147 {
1148 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1149 int first_rbe = first_visible_rbe(&lines_total);
1150 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1151 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1152 }
1153
1154 static void com_scroll_top(void)
1155 {
1156 int i = RINGBUFFER_SIZE - 1;
1157 unsigned lines = 0;
1158
1159 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1160 i--;
1161 /* i is oldest entry */
1162 for (; lines < bot.lines && i >= 0; i--) {
1163 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1164 if (!rbe)
1165 break;
1166 lines += NUM_LINES(strlen(rbe->msg));
1167 }
1168 i++;
1169 if (lines > 0 && scroll_position != i) {
1170 scroll_position = i;
1171 redraw_bot_win();
1172 print_scroll_msg();
1173 return;
1174 }
1175 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1176 }
1177
1178 static void com_cancel_scrolling(void)
1179 {
1180
1181 if (scroll_position == 0) {
1182 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1183 return;
1184 }
1185 scroll_position = 0;
1186 redraw_bot_win();
1187 }
1188
1189 static void com_page_down(void)
1190 {
1191 unsigned lines = 0;
1192 int i = scroll_position;
1193 while (lines < bot.lines && --i > 0) {
1194 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1195 if (!rbe)
1196 break;
1197 lines += NUM_LINES(strlen(rbe->msg));
1198 }
1199 if (lines) {
1200 scroll_position = i;
1201 redraw_bot_win();
1202 print_scroll_msg();
1203 return;
1204 }
1205 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1206 }
1207
1208 static void com_page_up(void)
1209 {
1210 unsigned lines;
1211 int fvr = first_visible_rbe(&lines);
1212
1213 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1214 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1215 return;
1216 }
1217 scroll_position = fvr + 1;
1218 for (; scroll_position > 0; scroll_position--) {
1219 first_visible_rbe(&lines);
1220 if (lines == bot.lines)
1221 break;
1222 }
1223 redraw_bot_win();
1224 print_scroll_msg();
1225 }
1226
1227 static void com_scroll_down(void)
1228 {
1229 struct rb_entry *rbe;
1230 int rbe_lines;
1231
1232 if (!scroll_position) {
1233 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1234 return;
1235 }
1236 scroll_position--;
1237 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1238 rbe_lines = NUM_LINES(rbe->len);
1239 wscrl(bot.win, rbe_lines);
1240 wmove(bot.win, bot.lines - rbe_lines, 0);
1241 wattron(bot.win, COLOR_PAIR(rbe->color));
1242 waddstr(bot.win, rbe->msg);
1243 wrefresh(bot.win);
1244 print_scroll_msg();
1245 }
1246
1247 static void com_scroll_up(void)
1248 {
1249 struct rb_entry *rbe = NULL;
1250 unsigned lines;
1251 int i, first_rbe, num_scroll;
1252
1253 /* the entry that is going to vanish */
1254 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1255 if (!rbe)
1256 goto err_out;
1257 num_scroll = NUM_LINES(rbe->len);
1258 first_rbe = first_visible_rbe(&lines);
1259 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1260 goto err_out;
1261 scroll_position++;
1262 wscrl(bot.win, -num_scroll);
1263 i = draw_top_rbe(&lines);
1264 if (i < 0)
1265 goto err_out;
1266 while (i > 0 && lines < num_scroll) {
1267 int rbe_lines;
1268 rbe = ringbuffer_get(bot_win_rb, --i);
1269 if (!rbe)
1270 break;
1271 rbe_lines = NUM_LINES(rbe->len);
1272 lines += rbe_lines;
1273 // fprintf(stderr, "msg: %s\n", rbe->msg);
1274 wattron(bot.win, COLOR_PAIR(rbe->color));
1275 waddstr(bot.win, "\n");
1276 waddstr(bot.win, rbe->msg);
1277 if (!i)
1278 break;
1279 i--;
1280 }
1281 wrefresh(bot.win);
1282 print_scroll_msg();
1283 return;
1284 err_out:
1285 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1286 }
1287
1288 static void com_ll_decr(void)
1289 {
1290 if (loglevel <= LL_DEBUG) {
1291 print_in_bar(COLOR_ERRMSG,
1292 "loglevel already at maximal verbosity\n");
1293 return;
1294 }
1295 loglevel--;
1296 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1297 }
1298
1299 static void com_ll_incr(void)
1300 {
1301 if (loglevel >= LL_EMERG) {
1302 print_in_bar(COLOR_ERRMSG,
1303 "loglevel already at minimal verbosity\n");
1304 return;
1305 }
1306 loglevel++;
1307 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1308 }
1309
1310 /*
1311 * reread configuration, terminate on errors
1312 */
1313 static void com_reread_conf(void)
1314 {
1315 char *cf =configfile_exists();
1316 struct gui_cmdline_parser_params params = {
1317 .override = 1,
1318 .initialize = 1,
1319 .check_required = 0,
1320 .check_ambiguity = 0,
1321 .print_errors = 0,
1322 };
1323
1324 if (!cf) {
1325 PARA_WARNING_LOG("there is no configuration to read");
1326 return;
1327 }
1328 PARA_INFO_LOG("rereading command line options and config file");
1329 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1330 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1331 PARA_EMERG_LOG("errors in config file");
1332 finish(EXIT_FAILURE);
1333 }
1334 PARA_NOTICE_LOG("config file reloaded");
1335 if (check_key_map_args() < 0)
1336 finish(EXIT_FAILURE);
1337 }
1338
1339 static void com_help(void)
1340 {
1341 int i;
1342
1343 for (i = 0; i < conf.key_map_given; ++i) {
1344 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1345 const char *handler_text = "???", *desc = NULL;
1346
1347 if (!split_key_map(tmp, &handler, &arg)) {
1348 free(tmp);
1349 return;
1350 }
1351 switch (*handler) {
1352 case 'i':
1353 handler_text = "internal";
1354 desc = command_list[find_cmd_byname(arg)].description;
1355 break;
1356 case 'x': handler_text = "external"; break;
1357 case 'd': handler_text = "display "; break;
1358 case 'p': handler_text = "para "; break;
1359 }
1360 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1361 strlen(arg) < 8? "\t" : "",
1362 desc? desc : "");
1363 free(tmp);
1364 }
1365 for (i = 0; command_list[i].handler; i++) {
1366 struct gui_command gc = command_list[i];
1367
1368 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1369 strlen(gc.name) < 8? "\t" : "",
1370 gc.description);
1371 }
1372 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1373 "for more info");
1374 }
1375
1376 static void com_shrink_top_win(void)
1377 {
1378 if (top.lines <= theme.top_lines_min) {
1379 PARA_WARNING_LOG("can not decrease top window");
1380 return;
1381 }
1382 init_wins(top.lines - 1);
1383 wclear(top.win);
1384 print_all_items();
1385 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1386 }
1387
1388 static void com_enlarge_top_win(void)
1389 {
1390 if (bot.lines < 3) {
1391 PARA_WARNING_LOG("can not increase top window");
1392 return;
1393 }
1394 init_wins(top.lines + 1);
1395 wclear(top.win);
1396 print_all_items();
1397 print_in_bar(COLOR_MSG, "increased top window");
1398 }
1399
1400 static void com_version(void)
1401 {
1402 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1403 CODENAME "\"");
1404 }
1405
1406 __noreturn static void com_quit(void)
1407 {
1408 finish(0);
1409 }
1410
1411 static void com_refresh(void)
1412 {
1413 shutdown_curses();
1414 init_curses();
1415 }
1416
1417 static void change_theme(int next)
1418 {
1419 if (next)
1420 next_theme(&theme);
1421 else
1422 prev_theme(&theme);
1423 /* This seems to be needed twice, why? */
1424 com_refresh();
1425 com_refresh();
1426 PARA_NOTICE_LOG("new theme: %s", theme.name);
1427 }
1428
1429 static void com_next_theme(void)
1430 {
1431 change_theme(1);
1432 }
1433
1434 static void com_prev_theme(void)
1435 {
1436 change_theme(0);
1437 }
1438
1439
1440 static void handle_command(int c)
1441 {
1442 int i;
1443
1444 /* first check user's key bindings */
1445 for (i = 0; i < conf.key_map_given; ++i) {
1446 char *tmp, *handler, *arg;
1447
1448 tmp = para_strdup(conf.key_map_arg[i]);
1449 if (!split_key_map(tmp, &handler, &arg)) {
1450 free(tmp);
1451 return;
1452 }
1453 if (strcmp(tmp, km_keyname(c))) {
1454 free(tmp);
1455 continue;
1456 }
1457 if (*handler == 'd')
1458 display_cmd(arg);
1459 else if (*handler == 'x')
1460 external_cmd(arg);
1461 else if (*handler == 'p')
1462 para_cmd(arg);
1463 else if (*handler == 'i') {
1464 int num = find_cmd_byname(arg);
1465 if (num >= 0)
1466 command_list[num].handler();
1467 }
1468 free(tmp);
1469 return;
1470 }
1471 /* not found, check internal key bindings */
1472 for (i = 0; command_list[i].handler; i++) {
1473 if (!strcmp(km_keyname(c), command_list[i].key)) {
1474 command_list[i].handler();
1475 return;
1476 }
1477 }
1478 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1479 km_keyname(c));
1480 }
1481
1482 int main(int argc, char *argv[])
1483 {
1484 int ret;
1485 char *cf;
1486
1487 _argc = argc;
1488 _argv = argv;
1489
1490 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1491 HANDLE_VERSION_FLAG("gui", conf);
1492 cf = configfile_exists();
1493 if (!cf && conf.config_file_given) {
1494 fprintf(stderr, "can not read config file %s\n",
1495 conf.config_file_arg);
1496 exit(EXIT_FAILURE);
1497 }
1498 if (cf) {
1499 struct gui_cmdline_parser_params params = {
1500 .override = 0,
1501 .initialize = 0,
1502 .check_required = 0,
1503 .check_ambiguity = 0,
1504 .print_errors = 1,
1505 };
1506 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1507 exit(EXIT_FAILURE);
1508 }
1509 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1510 if (check_key_map_args() < 0) {
1511 fprintf(stderr, "invalid key map\n");
1512 exit(EXIT_FAILURE);
1513 }
1514 init_theme_or_die(conf.theme_arg, &theme);
1515 top.lines = theme.top_lines_default;
1516 setup_signal_handling();
1517 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1518 initscr(); /* needed only once, always successful */
1519 init_curses();
1520 print_welcome();
1521 for (;;) {
1522 print_status_bar();
1523 ret = do_select(GETCH_MODE);
1524 if (!ret)
1525 continue;
1526 print_in_bar(COLOR_MSG, " ");
1527 handle_command(ret);
1528 }
1529 }