gui: Improve check_key_map_args().
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2014 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 #include <locale.h>
14 #include <sys/time.h>
15
16 #include "gui.cmdline.h"
17 #include "para.h"
18 #include "gui.h"
19 #include "string.h"
20 #include "ringbuffer.h"
21 #include "fd.h"
22 #include "error.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "signal.h"
26 #include "ggo.h"
27 #include "version.h"
28
29 /** define the array of error lists needed by para_gui */
30 INIT_GUI_ERRLISTS;
31 static char *stat_content[NUM_STAT_ITEMS];
32
33 static int signal_pipe;
34
35 static struct gui_window {
36 WINDOW *win;
37 size_t cols;
38 size_t lines;
39 } top, bot, sb, in, sep;
40
41 #define RINGBUFFER_SIZE 512
42 struct rb_entry {
43 char *msg;
44 size_t len;
45 int color;
46 };
47 static struct ringbuffer *bot_win_rb;
48 #define NUM_LINES(len) (1 + (len) / bot.cols)
49
50 static unsigned scroll_position;
51
52 static pid_t cmd_pid;
53
54 static int command_fds[2] = {-1, -1};
55 static int stat_pipe = -1;
56 static struct gui_args_info conf;
57
58 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
59
60
61 /**
62 * Codes for various colors.
63 *
64 * Each status item has its own color pair. The ones defined here start at a
65 * higher number so that they do not overlap with these.
66 */
67 enum gui_color_pair {
68 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
69 COLOR_COMMAND,
70 COLOR_OUTPUT,
71 COLOR_MSG,
72 COLOR_ERRMSG,
73 COLOR_SEPARATOR,
74 COLOR_TOP,
75 COLOR_BOT,
76 };
77
78 struct gui_command {
79 const char *key;
80 const char *name;
81 const char *description;
82 void (*handler)(void);
83 };
84
85 static struct gui_theme theme;
86
87 static void com_help(void);
88 static void com_reread_conf(void);
89 static void com_enlarge_top_win(void);
90 static void com_shrink_top_win(void);
91 static void com_version(void);
92 __noreturn static void com_quit(void);
93 static void com_refresh(void);
94 static void com_ll_incr(void);
95 static void com_ll_decr(void);
96 static void com_prev_theme(void);
97 static void com_next_theme(void);
98 static void com_scroll_up(void);
99 static void com_scroll_down(void);
100 static void com_page_up(void);
101 static void com_page_down(void);
102 static void com_cancel_scrolling(void);
103 static void com_scroll_top(void);
104
105 static struct gui_command command_list[] = {
106 {
107 .key = "?",
108 .name = "help",
109 .description = "print help",
110 .handler = com_help
111 }, {
112 .key = "+",
113 .name = "enlarge_win",
114 .description = "enlarge the top window",
115 .handler = com_enlarge_top_win
116 }, {
117 .key = "-",
118 .name = "shrink_win",
119 .description = "shrink the top window",
120 .handler = com_shrink_top_win
121 }, {
122 .key = "r",
123 .name = "reread_conf",
124 .description = "reread configuration file",
125 .handler = com_reread_conf
126 }, {
127 .key = "q",
128 .name = "quit",
129 .description = "exit para_gui",
130 .handler = com_quit
131 }, {
132 .key = "^L",
133 .name = "refresh",
134 .description = "redraw the screen",
135 .handler = com_refresh
136 }, {
137 .key = ".",
138 .name = "next_theme",
139 .description = "switch to next theme",
140 .handler = com_next_theme
141 }, {
142 .key = ",",
143 .name = "prev_theme",
144 .description = "switch to previous stream",
145 .handler = com_prev_theme
146 }, {
147 .key = ">",
148 .name = "ll_incr",
149 .description = "increase loglevel (decreases verbosity)",
150 .handler = com_ll_incr
151 }, {
152 .key = "<",
153 .name = "ll_decr",
154 .description = "decrease loglevel (increases verbosity)",
155 .handler = com_ll_decr
156 }, {
157 .key = "V",
158 .name = "version",
159 .description = "show the para_gui version",
160 .handler = com_version
161 }, {
162 .key = "<up>",
163 .name = "scroll_up",
164 .description = "scroll up one line",
165 .handler = com_scroll_up
166 }, {
167 .key = "<down>",
168 .name = "scroll_down",
169 .description = "scroll down one line",
170 .handler = com_scroll_down
171 }, {
172 .key = "<ppage>",
173 .name = "page_up",
174 .description = "scroll up one page",
175 .handler = com_page_up
176 }, {
177 .key = "<npage>",
178 .name = "page_down",
179 .description = "scroll down one page",
180 .handler = com_page_down
181 }, {
182 .key = "<home>",
183 .name = "scroll_top",
184 .description = "scroll to top of buffer",
185 .handler = com_scroll_top
186 }, {
187 .key = "<end>",
188 .name = "cancel_scroll",
189 .description = "deactivate scroll mode",
190 .handler = com_cancel_scrolling
191 }, {
192 .handler = NULL
193 }
194 };
195
196 static int find_cmd_byname(char *name)
197 {
198 int i;
199
200 for (i = 0; command_list[i].handler; i++)
201 if (!strcmp(command_list[i].name, name))
202 return i;
203 return -1;
204 }
205
206 /* isendwin() returns false before initscr() was called */
207 static bool curses_active(void)
208 {
209 return top.win && !isendwin();
210 }
211
212 /* taken from mutt */
213 static char *km_keyname(int c)
214 {
215 static char buf[10];
216
217 if (c == KEY_UP) {
218 sprintf(buf, "<up>");
219 return buf;
220 }
221 if (c == KEY_DOWN) {
222 sprintf(buf, "<down>");
223 return buf;
224 }
225 if (c == KEY_LEFT) {
226 sprintf(buf, "<left>");
227 return buf;
228 }
229 if (c == KEY_RIGHT) {
230 sprintf(buf, "<right>");
231 return buf;
232 }
233 if (c == KEY_NPAGE) {
234 sprintf(buf, "<npage>");
235 return buf;
236 }
237 if (c == KEY_PPAGE) {
238 sprintf(buf, "<ppage>");
239 return buf;
240 }
241 if (c == KEY_HOME) {
242 sprintf(buf, "<home>");
243 return buf;
244 }
245 if (c == KEY_END) {
246 sprintf(buf, "<end>");
247 return buf;
248 }
249 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
250 if (c < 0)
251 c += 256;
252 if (c < 128) {
253 buf[0] = '^';
254 buf[1] = (c + '@') & 0x7f;
255 buf[2] = 0;
256 } else
257 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
258 (c >> 3) & 7, c & 7);
259 } else if (c >= KEY_F0 && c < KEY_F(256))
260 sprintf(buf, "<F%d>", c - KEY_F0);
261 else if (isprint(c))
262 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
263 else
264 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
265 return buf;
266 }
267
268 static char *configfile_exists(void)
269 {
270 static char *config_file;
271 char *tmp;
272
273 if (!conf.config_file_given) {
274 if (!config_file) {
275 char *home = para_homedir();
276 config_file = make_message("%s/.paraslash/gui.conf",
277 home);
278 free(home);
279 }
280 tmp = config_file;
281 } else
282 tmp = conf.config_file_arg;
283 return file_exists(tmp)? tmp: NULL;
284 }
285
286 /* Print given number of spaces to curses window. */
287 static void add_spaces(WINDOW* win, unsigned int num)
288 {
289 char space[] = " ";
290 unsigned sz = sizeof(space) - 1; /* number of spaces */
291
292 while (num >= sz) {
293 waddstr(win, space);
294 num -= sz;
295 }
296 if (num > 0) {
297 assert(num < sz);
298 space[num] = '\0';
299 waddstr(win, space);
300 }
301 }
302
303 /*
304 * print aligned string to curses window. This function always prints
305 * exactly len chars.
306 */
307 static int align_str(WINDOW* win, char *str, unsigned int len,
308 unsigned int align)
309 {
310 int ret, i, num; /* of spaces */
311 size_t width;
312
313 if (!win || !str)
314 return 0;
315 ret = strwidth(str, &width);
316 if (ret < 0) {
317 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
318 width = 0;
319 str[0] = '\0';
320 }
321 num = len - width;
322 if (num < 0) {
323 str[len] = '\0';
324 num = 0;
325 }
326 /* replace control characters by spaces */
327 for (i = 0; i < len && str[i]; i++) {
328 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
329 str[i] = ' ';
330 }
331 if (align == LEFT) {
332 waddstr(win, str);
333 add_spaces(win, num);
334 } else if (align == RIGHT) {
335 add_spaces(win, num);
336 waddstr(win, str);
337 } else {
338 add_spaces(win, num / 2);
339 waddstr(win, str[0]? str: "");
340 add_spaces(win, num - num / 2);
341 }
342 return 1;
343 }
344
345 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
346 {
347 char *msg;
348 va_list ap;
349
350 if (!curses_active())
351 return;
352 wattron(in.win, COLOR_PAIR(color));
353 va_start(ap, fmt);
354 xvasprintf(&msg, fmt, ap);
355 va_end(ap);
356 wmove(in.win, 0, 0);
357 align_str(in.win, msg, in.cols, LEFT);
358 free(msg);
359 wrefresh(in.win);
360 }
361
362 static void print_status_bar(void)
363 {
364 char *tmp;
365
366 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
367 wmove(sb.win, 0, 0);
368 align_str(sb.win, tmp, sb.cols, CENTER);
369 free(tmp);
370 }
371
372 /*
373 * get the number of the oldest rbe that is (partially) visible. On return,
374 * lines contains the sum of the number of lines of all visible entries. If the
375 * first one is only partially visible, lines is greater than bot.lines.
376 */
377 static int first_visible_rbe(unsigned *lines)
378 {
379 int i;
380 *lines = 0;
381 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
382 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
383 int rbe_lines;
384 if (!rbe)
385 return i - 1;
386 rbe_lines = NUM_LINES(rbe->len);
387 if (rbe_lines > bot.lines)
388 return -1;
389 *lines += rbe_lines;
390 if (*lines >= bot.lines)
391 return i;
392 }
393 return RINGBUFFER_SIZE - 1;
394 }
395
396 /*
397 returns number of first visible rbe, *lines is the number of lines drawn.
398 */
399 static int draw_top_rbe(unsigned *lines)
400 {
401 int ret, fvr = first_visible_rbe(lines);
402 struct rb_entry *rbe;
403 size_t bytes_to_skip, cells_to_skip, width;
404
405 if (fvr < 0)
406 return -1;
407 wmove(bot.win, 0, 0);
408 rbe = ringbuffer_get(bot_win_rb, fvr);
409 if (!rbe)
410 return -1;
411 if (*lines > bot.lines) {
412 /* rbe is partially visible multi-line */
413 cells_to_skip = (*lines - bot.lines) * bot.cols;
414 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
415 if (ret < 0)
416 return ret;
417 ret = strwidth(rbe->msg + bytes_to_skip, &width);
418 if (ret < 0)
419 return ret;
420 } else {
421 bytes_to_skip = 0;
422 width = rbe->len;
423 }
424 wattron(bot.win, COLOR_PAIR(rbe->color));
425 waddstr(bot.win, rbe->msg + bytes_to_skip);
426 *lines = NUM_LINES(width);
427 return fvr;
428 }
429
430 static void redraw_bot_win(void)
431 {
432 unsigned lines;
433 int i;
434
435 wmove(bot.win, 0, 0);
436 wclear(bot.win);
437 i = draw_top_rbe(&lines);
438 if (i <= 0)
439 goto out;
440 while (i > 0 && lines < bot.lines) {
441 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
442 if (!rbe) {
443 lines++;
444 waddstr(bot.win, "\n");
445 continue;
446 }
447 lines += NUM_LINES(rbe->len);
448 wattron(bot.win, COLOR_PAIR(rbe->color));
449 waddstr(bot.win, "\n");
450 waddstr(bot.win, rbe->msg);
451 }
452 out:
453 wrefresh(bot.win);
454 }
455
456 static void rb_add_entry(int color, char *msg)
457 {
458 struct rb_entry *old, *new;
459 int x, y;
460 size_t len;
461
462 if (strwidth(msg, &len) < 0)
463 return;
464 new = para_malloc(sizeof(struct rb_entry));
465 new->color = color;
466 new->len = len;
467 new->msg = msg;
468 old = ringbuffer_add(bot_win_rb, new);
469 if (old) {
470 free(old->msg);
471 free(old);
472 }
473 if (scroll_position) {
474 /* discard current scrolling, like xterm does */
475 scroll_position = 0;
476 redraw_bot_win();
477 return;
478 }
479 wattron(bot.win, COLOR_PAIR(color));
480 getyx(bot.win, y, x);
481 if (y || x)
482 waddstr(bot.win, "\n");
483 waddstr(bot.win, msg);
484 }
485
486 /*
487 * print formated output to bot win and refresh
488 */
489 __printf_2_3 static void outputf(int color, const char* fmt,...)
490 {
491 char *msg;
492 va_list ap;
493
494 if (!curses_active())
495 return;
496 va_start(ap, fmt);
497 xvasprintf(&msg, fmt, ap);
498 va_end(ap);
499 rb_add_entry(color, msg);
500 wrefresh(bot.win);
501 }
502
503 static int add_output_line(char *line, void *data)
504 {
505 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
506
507 if (!curses_active())
508 return 1;
509 rb_add_entry(color, para_strdup(line));
510 return 1;
511 }
512
513 static int loglevel;
514
515 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
516 {
517 va_list ap;
518
519 if (ll < loglevel)
520 return;
521 va_start(ap, fmt);
522 if (curses_active()) {
523 int color = ll <= LL_NOTICE? COLOR_MSG : COLOR_ERRMSG;
524 char *msg;
525 unsigned bytes = xvasprintf(&msg, fmt, ap);
526 if (bytes > 0 && msg[bytes - 1] == '\n')
527 msg[bytes - 1] = '\0'; /* cut trailing newline */
528 rb_add_entry(color, msg);
529 wrefresh(bot.win);
530 } else if (cmd_pid <= 0) /* no external command running */
531 vfprintf(stderr, fmt, ap);
532 va_end(ap);
533 }
534 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
535
536 static void setup_signal_handling(void)
537 {
538 signal_pipe = para_signal_init();
539 para_install_sighandler(SIGINT);
540 para_install_sighandler(SIGTERM);
541 para_install_sighandler(SIGCHLD);
542 para_install_sighandler(SIGWINCH);
543 para_install_sighandler(SIGUSR1);
544 }
545
546 static void shutdown_curses(void)
547 {
548 def_prog_mode();
549 endwin();
550 }
551
552 /* disable curses, print a message, kill running processes and exit */
553 __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
554 {
555 va_list argp;
556
557 shutdown_curses();
558 va_start(argp, fmt);
559 vfprintf(stderr, fmt, argp);
560 va_end(argp);
561 /* kill every process in the process group and exit */
562 para_sigaction(SIGTERM, SIG_IGN);
563 kill(0, SIGTERM);
564 exit(exit_code);
565 }
566
567 /*
568 * init all windows
569 */
570 static void init_wins(int top_lines)
571 {
572 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
573 in_y = LINES - 1, sep_y = top_lines;
574
575 top.lines = top_lines;
576 bot.lines = LINES - top.lines - 3;
577 sb.lines = in.lines = sep.lines = 1;
578
579 top.cols = bot.cols = sb.cols = in.cols = sep.cols = COLS;
580
581 assume_default_colors(theme.default_fg, theme.default_bg);
582 if (top.win) {
583 wresize(top.win, top.lines, top.cols);
584 mvwin(top.win, top_y, 0);
585
586 wresize(sb.win, sb.lines, sb.cols);
587 mvwin(sb.win, sb_y, 0);
588
589 wresize(sep.win, sep.lines, sep.cols);
590 mvwin(sep.win, sep_y, 0);
591
592 wresize(bot.win, bot.lines, bot.cols);
593 mvwin(bot.win, bot_y, 0);
594
595 wresize(in.win, in.lines, in.cols);
596 mvwin(in.win, in_y, 0);
597 } else {
598 sep.win = newwin(sep.lines, sep.cols, sep_y, 0);
599 top.win = newwin(top.lines, top.cols, top_y, 0);
600 bot.win = newwin(bot.lines, bot.cols, bot_y, 0);
601 sb.win = newwin(sb.lines, sb.cols, sb_y, 0);
602 in.win = newwin(in.lines, in.cols, in_y, 0);
603 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
604 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
605 wclear(bot.win);
606 wclear(sb.win);
607 wclear(in.win);
608 scrollok(bot.win, 1);
609 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
610 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
611 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
612 wattron(top.win, COLOR_PAIR(COLOR_TOP));
613 nodelay(top.win, 1);
614 nodelay(bot.win, 1);
615 nodelay(sb.win, 1);
616 nodelay(in.win, 0);
617
618 keypad(top.win, 1);
619 keypad(bot.win, 1);
620 keypad(sb.win, 1);
621 keypad(in.win, 1);
622 }
623 wmove(sep.win, 0, 0);
624 whline(sep.win, theme.sep_char, COLS);
625 wclear(top.win);
626 //wclear(bot.win);
627 wnoutrefresh(top.win);
628 wnoutrefresh(bot.win);
629 print_status_bar();
630 wnoutrefresh(sb.win);
631 wnoutrefresh(in.win);
632 wnoutrefresh(sep.win);
633 doupdate();
634 }
635
636 /*
637 * Print stat item #i to curses window
638 */
639 static void print_stat_item(int i)
640 {
641 char *tmp;
642 struct stat_item_data d = theme.data[i];
643 char *c = stat_content[i];
644
645 if (!curses_active() || !d.len || !c)
646 return;
647 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
648 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
649 wrefresh(top.win);
650 wattron(top.win, COLOR_PAIR(i + 1));
651 align_str(top.win, tmp, d.len * COLS / 100, d.align);
652 free(tmp);
653 wrefresh(top.win);
654 }
655
656 static int update_item(int item_num, char *buf)
657 {
658 char **c = stat_content + item_num;
659
660 free(*c);
661 if (buf && buf[0])
662 goto dup;
663 switch (item_num) {
664 case SI_ARTIST:
665 *c = para_strdup("(artist tag not set)");
666 goto print;
667 case SI_TITLE:
668 *c = para_strdup("(title tag not set)");
669 goto print;
670 case SI_YEAR:
671 *c = para_strdup("????");
672 goto print;
673 case SI_ALBUM:
674 *c = para_strdup("(album tag not set)");
675 goto print;
676 case SI_COMMENT:
677 *c = para_strdup("(comment tag not set)");
678 goto print;
679 }
680 dup:
681 *c = para_strdup(buf);
682 print:
683 print_stat_item(item_num);
684 return 1;
685 }
686
687 static int read_stat_pipe(fd_set *rfds)
688 {
689 static char *buf;
690 static int bufsize, loaded;
691 int ret, ret2;
692 size_t sz;
693
694 if (stat_pipe < 0)
695 return 0;
696 if (loaded >= bufsize) {
697 if (bufsize > 1000 * 1000) {
698 loaded = 0;
699 return 0;
700 }
701 bufsize += bufsize + 1000;
702 buf = para_realloc(buf, bufsize);
703 }
704 assert(loaded < bufsize);
705 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
706 rfds, &sz);
707 loaded += sz;
708 ret2 = for_each_stat_item(buf, loaded, update_item);
709 if (ret < 0 || ret2 < 0) {
710 loaded = 0;
711 return ret2 < 0? ret2 : ret;
712 }
713 sz = ret2; /* what is left */
714 if (sz > 0 && sz < loaded)
715 memmove(buf, buf + loaded - sz, sz);
716 loaded = sz;
717 return 1;
718 }
719
720 static void print_all_items(void)
721 {
722 int i;
723
724 if (!curses_active())
725 return;
726 FOR_EACH_STATUS_ITEM(i)
727 print_stat_item(i);
728 }
729
730 static void clear_all_items(void)
731 {
732 int i;
733
734 FOR_EACH_STATUS_ITEM(i) {
735 free(stat_content[i]);
736 stat_content[i] = para_strdup("");
737 }
738 }
739
740 static void init_pair_or_die(short pair, short f, short b)
741 {
742 if (init_pair(pair, f, b) == ERR)
743 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
744 }
745
746 static void init_colors_or_die(void)
747 {
748 int i;
749
750 if (!has_colors())
751 die(EXIT_FAILURE, "fatal: No color term\n");
752 if (start_color() == ERR)
753 die(EXIT_FAILURE, "fatal: failed to start colors\n");
754 FOR_EACH_STATUS_ITEM(i)
755 if (theme.data[i].len)
756 init_pair_or_die(i + 1, theme.data[i].fg,
757 theme.data[i].bg);
758 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
759 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
760 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
761 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
762 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
763 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
764 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
765 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
766 }
767
768 /* (Re-)initialize the curses library. */
769 static void init_curses(void)
770 {
771 if (curses_active())
772 return;
773 if (top.win && refresh() == ERR) /* refresh is really needed */
774 die(EXIT_FAILURE, "refresh() failed\n");
775 if (LINES < theme.lines_min || COLS < theme.cols_min)
776 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
777 " (need at least %dx%d)\n", COLS, LINES,
778 theme.cols_min, theme.lines_min);
779 curs_set(0); /* make cursor invisible, ignore errors */
780 nonl(); /* do not NL->CR/NL on output, always returns OK */
781 /* don't echo input */
782 if (noecho() == ERR)
783 die(EXIT_FAILURE, "fatal: noecho() failed\n");
784 /* take input chars one at a time, no wait for \n */
785 if (cbreak() == ERR)
786 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
787 init_colors_or_die();
788 clear(); /* ignore non-fatal errors */
789 init_wins(theme.top_lines_default);
790 print_all_items();
791 // noecho(); /* don't echo input */
792 }
793
794 static void check_sigchld(void)
795 {
796 int ret;
797 pid_t pid;
798
799 reap_next_child:
800 ret = para_reap_child(&pid);
801 if (ret <= 0)
802 return;
803 if (pid == cmd_pid)
804 cmd_pid = 0;
805 goto reap_next_child;
806 }
807
808 /*
809 * This sucker modifies its first argument. *handler and *arg are
810 * pointers to 0-terminated strings (inside line). Crap.
811 */
812 static int split_key_map(char *line, char **handler, char **arg)
813 {
814 if (!(*handler = strchr(line + 1, ':')))
815 goto err_out;
816 **handler = '\0';
817 (*handler)++;
818 if (!(*arg = strchr(*handler, ':')))
819 goto err_out;
820 **arg = '\0';
821 (*arg)++;
822 return 1;
823 err_out:
824 return 0;
825 }
826
827 static void check_key_map_args_or_die(void)
828 {
829 int i;
830 char *tmp = NULL;
831
832 for (i = 0; i < conf.key_map_given; ++i) {
833 char *handler, *arg;
834
835 free(tmp);
836 tmp = para_strdup(conf.key_map_arg[i]);
837 if (!split_key_map(tmp, &handler, &arg))
838 break;
839 if (strlen(handler) != 1)
840 break;
841 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
842 && *handler != 'p')
843 break;
844 if (*handler != 'i')
845 continue;
846 if (find_cmd_byname(arg) < 0)
847 break;
848 }
849 if (i != conf.key_map_given)
850 die(EXIT_FAILURE, "invalid key map: %s\n", conf.key_map_arg[i]);
851 free(tmp);
852 }
853
854 /*
855 * React to various signal-related events
856 */
857 static void handle_signal(int sig)
858 {
859 switch (sig) {
860 case SIGTERM:
861 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
862 return;
863 case SIGWINCH:
864 if (curses_active()) {
865 shutdown_curses();
866 init_curses();
867 redraw_bot_win();
868 }
869 return;
870 case SIGINT:
871 PARA_WARNING_LOG("caught SIGINT, reset\n");
872 /* Nothing to do. SIGINT killed our child which gets noticed
873 * by do_select and resets everything.
874 */
875 return;
876 case SIGUSR1:
877 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
878 com_reread_conf();
879 return;
880 case SIGCHLD:
881 check_sigchld();
882 return;
883 }
884 }
885
886 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
887 {
888 static struct timeval next_exec, atm, diff;
889 int ret, fds[3] = {0, 1, 0};
890 pid_t pid;
891
892 if (stat_pipe >= 0)
893 goto success;
894 /* Avoid busy loop */
895 gettimeofday(&atm, NULL);
896 if (tv_diff(&next_exec, &atm, &diff) > 0) {
897 if (tv_diff(&diff, tv, NULL) < 0)
898 *tv = diff;
899 return;
900 }
901 next_exec.tv_sec = atm.tv_sec + 2;
902 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
903 if (ret < 0)
904 return;
905 ret = mark_fd_nonblocking(fds[1]);
906 if (ret < 0) {
907 close(fds[1]);
908 return;
909 }
910 stat_pipe = fds[1];
911 success:
912 para_fd_set(stat_pipe, rfds, max_fileno);
913 }
914
915 #define COMMAND_BUF_SIZE 32768
916
917 /*
918 * This is the core select loop. Besides the (internal) signal
919 * pipe, the following other fds are checked according to the mode:
920 *
921 * GETCH_MODE: check stdin, return when key is pressed
922 *
923 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
924 * stdout and stderr or when any key is pressed.
925 *
926 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
927 * is running. During that time curses is disabled. Returns when
928 * cmd_pid == 0.
929 */
930 static int do_select(int mode)
931 {
932 fd_set rfds;
933 int ret, i, max_fileno;
934 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
935 int cbo[2] = {0, 0}; /* command buf offsets */
936 struct timeval tv;
937 unsigned flags[2] = {0, 0}; /* for for_each_line() */
938
939 repeat:
940 tv.tv_sec = conf.timeout_arg / 1000;
941 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
942 // ret = refresh_status();
943 FD_ZERO(&rfds);
944 max_fileno = 0;
945 status_pre_select(&rfds, &max_fileno, &tv);
946 /* signal pipe */
947 para_fd_set(signal_pipe, &rfds, &max_fileno);
948 /* command pipe only for COMMAND_MODE */
949 if (mode == COMMAND_MODE) {
950 if (command_fds[0] >= 0)
951 para_fd_set(command_fds[0], &rfds, &max_fileno);
952 if (command_fds[1] >= 0)
953 para_fd_set(command_fds[1], &rfds, &max_fileno);
954 }
955 if (mode == GETCH_MODE || mode == COMMAND_MODE)
956 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
957 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
958 if (ret <= 0)
959 goto check_return; /* skip fd checks */
960 /* signals */
961 ret = para_next_signal(&rfds);
962 if (ret > 0)
963 handle_signal(ret);
964 /* read command pipe if ready */
965 if (mode == COMMAND_MODE) {
966 for (i = 0; i < 2; i++) {
967 size_t sz;
968 if (command_fds[i] < 0)
969 continue;
970 ret = read_nonblock(command_fds[i],
971 command_buf[i] + cbo[i],
972 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
973 cbo[i] += sz;
974 sz = cbo[i];
975 cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
976 add_output_line, &i);
977 if (sz != cbo[i]) { /* at least one line found */
978 wrefresh(bot.win);
979 flags[i] = 0;
980 }
981 if (ret < 0) {
982 PARA_NOTICE_LOG("closing command fd %d: %s\n",
983 i, para_strerror(-ret));
984 close(command_fds[i]);
985 command_fds[i] = -1;
986 flags[i] = 0;
987 cbo[i] = 0;
988 if (command_fds[!i] < 0) /* both fds closed */
989 return 0;
990 }
991 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
992 PARA_NOTICE_LOG("discarding overlong line\n");
993 cbo[i] = 0;
994 flags[i] = FELF_DISCARD_FIRST;
995 }
996 }
997 }
998 ret = read_stat_pipe(&rfds);
999 if (ret < 0) {
1000 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1001 close(stat_pipe);
1002 stat_pipe = -1;
1003 clear_all_items();
1004 free(stat_content[SI_BASENAME]);
1005 stat_content[SI_BASENAME] =
1006 para_strdup("stat command terminated!?");
1007 print_all_items();
1008 }
1009 check_return:
1010 switch (mode) {
1011 case COMMAND_MODE:
1012 ret = wgetch(top.win);
1013 if (ret != ERR && ret != KEY_RESIZE) {
1014 if (cmd_pid)
1015 kill(cmd_pid, SIGTERM);
1016 return -1;
1017 }
1018 break;
1019 case GETCH_MODE:
1020 ret = wgetch(top.win);
1021 if (ret != ERR && ret != KEY_RESIZE)
1022 return ret;
1023 break;
1024 case EXTERNAL_MODE:
1025 if (cmd_pid == 0)
1026 return 0;
1027 }
1028 goto repeat;
1029 }
1030
1031 /* read from command pipe and print data to bot window */
1032 static void exec_and_display_cmd(const char *cmd)
1033 {
1034 int ret, fds[3] = {0, 1, 1};
1035
1036 outputf(COLOR_COMMAND, "%s", cmd);
1037 ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1038 if (ret < 0)
1039 return;
1040 ret = mark_fd_nonblocking(fds[1]);
1041 if (ret < 0)
1042 goto fail;
1043 ret = mark_fd_nonblocking(fds[2]);
1044 if (ret < 0)
1045 goto fail;
1046 command_fds[0] = fds[1];
1047 command_fds[1] = fds[2];
1048 if (do_select(COMMAND_MODE) >= 0)
1049 PARA_INFO_LOG("command complete\n");
1050 else
1051 PARA_NOTICE_LOG("command aborted\n");
1052 print_in_bar(COLOR_MSG, " ");
1053 return;
1054 fail:
1055 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1056 close(command_fds[0]);
1057 close(command_fds[1]);
1058 }
1059
1060 static void para_cmd(char *cmd)
1061 {
1062 char *c;
1063
1064 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1065 c = make_message(BINDIR "/para_client -- %s", cmd);
1066 exec_and_display_cmd(c);
1067 free(c);
1068 }
1069
1070 static void display_cmd(char *cmd)
1071 {
1072 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1073 exec_and_display_cmd(cmd);
1074 }
1075
1076 /*
1077 * shutdown curses and stat pipe before executing external commands
1078 */
1079 static void external_cmd(char *cmd)
1080 {
1081 int fds[3] = {-1, -1, -1};
1082
1083 if (cmd_pid)
1084 return;
1085 shutdown_curses();
1086 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1087 return;
1088 do_select(EXTERNAL_MODE);
1089 init_curses();
1090 }
1091
1092 static void print_scroll_msg(void)
1093 {
1094 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1095 int first_rbe = first_visible_rbe(&lines_total);
1096
1097 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1098 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1099 }
1100
1101 static void com_scroll_top(void)
1102 {
1103 int i = RINGBUFFER_SIZE - 1;
1104 unsigned lines = 0;
1105
1106 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1107 i--;
1108 /* i is oldest entry */
1109 for (; lines < bot.lines && i >= 0; i--) {
1110 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1111 if (!rbe)
1112 break;
1113 lines += NUM_LINES(rbe->len);
1114 }
1115 i++;
1116 if (lines > 0 && scroll_position != i) {
1117 scroll_position = i;
1118 redraw_bot_win();
1119 print_scroll_msg();
1120 return;
1121 }
1122 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1123 }
1124
1125 static void com_cancel_scrolling(void)
1126 {
1127
1128 if (scroll_position == 0) {
1129 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1130 return;
1131 }
1132 scroll_position = 0;
1133 redraw_bot_win();
1134 }
1135
1136 static void com_page_down(void)
1137 {
1138 unsigned lines = 0;
1139 int i = scroll_position;
1140
1141 while (lines < bot.lines && --i > 0) {
1142 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1143 if (!rbe)
1144 break;
1145 lines += NUM_LINES(rbe->len);
1146 }
1147 if (lines) {
1148 scroll_position = i;
1149 redraw_bot_win();
1150 print_scroll_msg();
1151 return;
1152 }
1153 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1154 }
1155
1156 static void com_page_up(void)
1157 {
1158 unsigned lines;
1159 int fvr = first_visible_rbe(&lines);
1160
1161 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1162 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1163 return;
1164 }
1165 scroll_position = fvr + 1;
1166 for (; scroll_position > 0; scroll_position--) {
1167 first_visible_rbe(&lines);
1168 if (lines == bot.lines)
1169 break;
1170 }
1171 redraw_bot_win();
1172 print_scroll_msg();
1173 }
1174
1175 static void com_scroll_down(void)
1176 {
1177 struct rb_entry *rbe;
1178 int rbe_lines;
1179
1180 if (!scroll_position) {
1181 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1182 return;
1183 }
1184 scroll_position--;
1185 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1186 rbe_lines = NUM_LINES(rbe->len);
1187 wscrl(bot.win, rbe_lines);
1188 wmove(bot.win, bot.lines - rbe_lines, 0);
1189 wattron(bot.win, COLOR_PAIR(rbe->color));
1190 waddstr(bot.win, rbe->msg);
1191 wrefresh(bot.win);
1192 print_scroll_msg();
1193 }
1194
1195 static void com_scroll_up(void)
1196 {
1197 struct rb_entry *rbe = NULL;
1198 unsigned lines;
1199 int i, first_rbe, num_scroll;
1200
1201 /* the entry that is going to vanish */
1202 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1203 if (!rbe)
1204 goto err_out;
1205 num_scroll = NUM_LINES(rbe->len);
1206 first_rbe = first_visible_rbe(&lines);
1207 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1208 goto err_out;
1209 scroll_position++;
1210 wscrl(bot.win, -num_scroll);
1211 i = draw_top_rbe(&lines);
1212 if (i < 0)
1213 goto err_out;
1214 while (i > 0 && lines < num_scroll) {
1215 int rbe_lines;
1216 rbe = ringbuffer_get(bot_win_rb, --i);
1217 if (!rbe)
1218 break;
1219 rbe_lines = NUM_LINES(rbe->len);
1220 lines += rbe_lines;
1221 wattron(bot.win, COLOR_PAIR(rbe->color));
1222 waddstr(bot.win, "\n");
1223 waddstr(bot.win, rbe->msg);
1224 if (!i)
1225 break;
1226 i--;
1227 }
1228 wrefresh(bot.win);
1229 print_scroll_msg();
1230 return;
1231 err_out:
1232 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1233 }
1234
1235 static void com_ll_decr(void)
1236 {
1237 if (loglevel <= LL_DEBUG) {
1238 print_in_bar(COLOR_ERRMSG,
1239 "loglevel already at maximal verbosity\n");
1240 return;
1241 }
1242 loglevel--;
1243 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1244 }
1245
1246 static void com_ll_incr(void)
1247 {
1248 if (loglevel >= LL_EMERG) {
1249 print_in_bar(COLOR_ERRMSG,
1250 "loglevel already at minimal verbosity\n");
1251 return;
1252 }
1253 loglevel++;
1254 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1255 }
1256
1257 /*
1258 * reread configuration, terminate on errors
1259 */
1260 static void com_reread_conf(void)
1261 {
1262 char *cf = configfile_exists();
1263 struct gui_cmdline_parser_params params = {
1264 .override = 1,
1265 .initialize = 1,
1266 .check_required = 0,
1267 .check_ambiguity = 0,
1268 .print_errors = 0,
1269 };
1270
1271 if (!cf) {
1272 PARA_WARNING_LOG("there is no configuration to read\n");
1273 return;
1274 }
1275 PARA_INFO_LOG("rereading command line options and config file\n");
1276 /*
1277 * Despite .print_errors is set to 0, gengetopt will print to stderr
1278 * anyway, and exit on errors. So we have to shutdown curses first.
1279 */
1280 shutdown_curses();
1281 gui_cmdline_parser_config_file(cf, &conf, &params);
1282 init_curses();
1283 PARA_NOTICE_LOG("config file reloaded\n");
1284 check_key_map_args_or_die();
1285 }
1286
1287 static void com_help(void)
1288 {
1289 int i;
1290
1291 for (i = 0; i < conf.key_map_given; ++i) {
1292 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1293 const char *handler_text = "???", *desc = NULL;
1294
1295 if (!split_key_map(tmp, &handler, &arg)) {
1296 free(tmp);
1297 return;
1298 }
1299 switch (*handler) {
1300 case 'i':
1301 handler_text = "internal";
1302 desc = command_list[find_cmd_byname(arg)].description;
1303 break;
1304 case 'x': handler_text = "external"; break;
1305 case 'd': handler_text = "display "; break;
1306 case 'p': handler_text = "para "; break;
1307 }
1308 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1309 strlen(arg) < 8? "\t" : "",
1310 desc? desc : "");
1311 free(tmp);
1312 }
1313 for (i = 0; command_list[i].handler; i++) {
1314 struct gui_command gc = command_list[i];
1315
1316 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1317 strlen(gc.name) < 8? "\t" : "",
1318 gc.description);
1319 }
1320 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1321 "for more info");
1322 }
1323
1324 static void com_shrink_top_win(void)
1325 {
1326 if (top.lines <= theme.top_lines_min) {
1327 PARA_WARNING_LOG("can not decrease top window\n");
1328 return;
1329 }
1330 init_wins(top.lines - 1);
1331 print_all_items();
1332 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1333 }
1334
1335 static void com_enlarge_top_win(void)
1336 {
1337 if (bot.lines < 3) {
1338 PARA_WARNING_LOG("can not increase top window\n");
1339 return;
1340 }
1341 init_wins(top.lines + 1);
1342 print_all_items();
1343 print_in_bar(COLOR_MSG, "increased top window");
1344 }
1345
1346 static void com_version(void)
1347 {
1348 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1349 }
1350
1351 __noreturn static void com_quit(void)
1352 {
1353 die(EXIT_SUCCESS, "%s", "");
1354 }
1355
1356 static void com_refresh(void)
1357 {
1358 shutdown_curses();
1359 init_curses();
1360 }
1361
1362 static void com_next_theme(void)
1363 {
1364 theme_next(&theme);
1365 com_refresh();
1366 }
1367
1368 static void com_prev_theme(void)
1369 {
1370 theme_prev(&theme);
1371 com_refresh();
1372 }
1373
1374 static void handle_command(int c)
1375 {
1376 int i;
1377
1378 /* first check user-defined key bindings */
1379 for (i = 0; i < conf.key_map_given; ++i) {
1380 char *tmp, *handler, *arg;
1381
1382 tmp = para_strdup(conf.key_map_arg[i]);
1383 if (!split_key_map(tmp, &handler, &arg)) {
1384 free(tmp);
1385 return;
1386 }
1387 if (strcmp(tmp, km_keyname(c))) {
1388 free(tmp);
1389 continue;
1390 }
1391 if (*handler == 'd')
1392 display_cmd(arg);
1393 else if (*handler == 'x')
1394 external_cmd(arg);
1395 else if (*handler == 'p')
1396 para_cmd(arg);
1397 else if (*handler == 'i') {
1398 int num = find_cmd_byname(arg);
1399 if (num >= 0)
1400 command_list[num].handler();
1401 }
1402 free(tmp);
1403 return;
1404 }
1405 /* not found, check internal key bindings */
1406 for (i = 0; command_list[i].handler; i++) {
1407 if (!strcmp(km_keyname(c), command_list[i].key)) {
1408 command_list[i].handler();
1409 return;
1410 }
1411 }
1412 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1413 km_keyname(c));
1414 }
1415
1416 __noreturn static void print_help_and_die(void)
1417 {
1418 struct ggo_help h = DEFINE_GGO_HELP(gui);
1419 bool d = conf.detailed_help_given;
1420
1421 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1422 exit(0);
1423 }
1424
1425 int main(int argc, char *argv[])
1426 {
1427 int ret;
1428 char *cf;
1429
1430 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1431 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1432 version_handle_flag("gui", conf.version_given);
1433 if (conf.help_given || conf.detailed_help_given)
1434 print_help_and_die();
1435 cf = configfile_exists();
1436 if (!cf && conf.config_file_given)
1437 die(EXIT_FAILURE, "can not read config file %s\n",
1438 conf.config_file_arg);
1439 if (cf) {
1440 struct gui_cmdline_parser_params params = {
1441 .override = 0,
1442 .initialize = 0,
1443 .check_required = 0,
1444 .check_ambiguity = 0,
1445 .print_errors = 1,
1446 };
1447 gui_cmdline_parser_config_file(cf, &conf, &params);
1448 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1449 }
1450 check_key_map_args_or_die();
1451 theme_init(conf.theme_arg, &theme);
1452 setup_signal_handling();
1453 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1454 setlocale(LC_CTYPE, "");
1455 initscr(); /* needed only once, always successful */
1456 init_curses();
1457 for (;;) {
1458 print_status_bar();
1459 ret = do_select(GETCH_MODE);
1460 if (!ret)
1461 continue;
1462 print_in_bar(COLOR_MSG, " ");
1463 handle_command(ret);
1464 }
1465 }