aft.c: Silence scan-build warning.
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2012 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 cmd_died, 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 cmd_died = 1;
840 }
841 goto reap_next_child;
842 }
843
844 /*
845 * This sucker modifies its first argument. *handler and *arg are
846 * pointers to 0-terminated strings (inside line). Crap.
847 */
848 static int split_key_map(char *line, char **handler, char **arg)
849 {
850 if (!(*handler = strchr(line + 1, ':')))
851 goto err_out;
852 **handler = '\0';
853 (*handler)++;
854 if (!(*arg = strchr(*handler, ':')))
855 goto err_out;
856 **arg = '\0';
857 (*arg)++;
858 return 1;
859 err_out:
860 return 0;
861 }
862
863 static int check_key_map_args(void)
864 {
865 char *s;
866 int i, ret = -1;
867 char *tmp = NULL, *handler, *arg;
868
869 for (i = 0; i < conf.key_map_given; ++i) {
870 s = conf.key_map_arg[i];
871 if (!(*s))
872 goto err_out;
873 free(tmp);
874 tmp = para_strdup(s);
875 if (!split_key_map(tmp, &handler, &arg))
876 goto err_out;
877 if (strlen(handler) != 1)
878 goto err_out;
879 if (*handler != 'x'
880 && *handler != 'd'
881 && *handler != 'i'
882 && *handler != 'p')
883 goto err_out;
884 if (*handler != 'i')
885 continue;
886 if (find_cmd_byname(arg) < 0)
887 goto err_out;
888 }
889 ret = 0;
890 err_out:
891 free(tmp);
892 return ret;
893 }
894
895 /*
896 * React to various signal-related events
897 */
898 static void handle_signal(int sig)
899 {
900 switch (sig) {
901 case SIGTERM:
902 msg_n_exit(EXIT_FAILURE,
903 "only the good die young (caught SIGTERM))\n");
904 return;
905 case SIGWINCH:
906 if (curses_active) {
907 shutdown_curses();
908 init_curses();
909 redraw_bot_win();
910 }
911 return;
912 case SIGINT:
913 PARA_WARNING_LOG("caught SIGINT, reset");
914 /* Nothing to do. SIGINT killed our child which gets noticed
915 * by do_select and resets everything.
916 */
917 return;
918 case SIGUSR1:
919 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
920 com_reread_conf();
921 return;
922 case SIGCHLD:
923 check_sigchld();
924 return;
925 }
926 }
927
928 static int open_stat_pipe(void)
929 {
930 static int init = 1;
931 int ret, fds[3] = {0, 1, 0};
932 pid_t pid;
933
934 if (init)
935 init = 0;
936 else
937 /*
938 * Sleep a bit to avoid a busy loop. As the call to sleep() may
939 * be interrupted by SIGCHLD, we simply wait until the call
940 * succeeds.
941 */
942 while (sleep(2))
943 ; /* nothing */
944 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
945 if (ret < 0)
946 return ret;
947 ret = mark_fd_nonblocking(fds[1]);
948 if (ret >= 0)
949 return fds[1];
950 close(fds[1]);
951 return ret;
952 }
953
954 #define COMMAND_BUF_SIZE 4096
955
956 /*
957 * This is the core select loop. Besides the (internal) signal
958 * pipe, the following other fds are checked according to the mode:
959 *
960 * GETCH_MODE: check stdin, return when key is pressed
961 *
962 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
963 * stdout and stderr or when any key is pressed.
964 *
965 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
966 * is running. During that time curses is disabled. Returns when
967 * cmd_pid == 0.
968 */
969 static int do_select(int mode)
970 {
971 fd_set rfds;
972 int ret, i, max_fileno;
973 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
974 int cbo[2] = {0, 0}; /* command buf offsets */
975 struct timeval tv;
976
977 repeat:
978 tv.tv_sec = conf.timeout_arg / 1000;
979 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
980 // ret = refresh_status();
981 FD_ZERO(&rfds);
982 max_fileno = 0;
983 if (stat_pipe < 0)
984 stat_pipe = open_stat_pipe();
985 if (stat_pipe >= 0)
986 para_fd_set(stat_pipe, &rfds, &max_fileno);
987 /* signal pipe */
988 para_fd_set(signal_pipe, &rfds, &max_fileno);
989 /* command pipe only for COMMAND_MODE */
990 if (mode == COMMAND_MODE) {
991 if (command_fds[0] >= 0)
992 para_fd_set(command_fds[0], &rfds, &max_fileno);
993 if (command_fds[1] >= 0)
994 para_fd_set(command_fds[1], &rfds, &max_fileno);
995 }
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 }
1027 }
1028 ret = read_stat_pipe(&rfds);
1029 if (ret < 0) {
1030 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1031 close(stat_pipe);
1032 stat_pipe = -1;
1033 clear_all_items();
1034 free(stat_content[SI_BASENAME]);
1035 stat_content[SI_BASENAME] =
1036 para_strdup("stat command terminated!?");
1037 print_all_items();
1038 }
1039 check_return:
1040 switch (mode) {
1041 case COMMAND_MODE:
1042 ret = wgetch(top.win);
1043 if (ret != ERR && ret != KEY_RESIZE) {
1044 if (command_fds[0] >= 0) {
1045 close(command_fds[0]);
1046 command_fds[0] = -1;
1047 }
1048 if (command_fds[1] >= 0) {
1049 close(command_fds[1]);
1050 command_fds[1] = -1;
1051 }
1052 if (cmd_pid)
1053 kill(cmd_pid, SIGTERM);
1054 return -1;
1055 }
1056 break;
1057 case GETCH_MODE:
1058 ret = wgetch(top.win);
1059 if (ret != ERR && ret != KEY_RESIZE)
1060 return ret;
1061 break;
1062 case EXTERNAL_MODE:
1063 if (cmd_died) {
1064 cmd_died = 0;
1065 return 0;
1066 }
1067 }
1068 goto repeat;
1069 }
1070
1071 /*
1072 * read from command pipe and print data to bot window
1073 */
1074 static void send_output(void)
1075 {
1076 int ret;
1077
1078 ret = mark_fd_nonblocking(command_fds[0]);
1079 if (ret < 0)
1080 goto fail;
1081 ret = mark_fd_nonblocking(command_fds[1]);
1082 if (ret < 0)
1083 goto fail;
1084 if (do_select(COMMAND_MODE) >= 0)
1085 PARA_INFO_LOG("command complete");
1086 else
1087 PARA_NOTICE_LOG("command aborted");
1088 print_in_bar(COLOR_MSG, " ");
1089 return;
1090 fail:
1091 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1092 close(command_fds[0]);
1093 close(command_fds[1]);
1094 }
1095
1096 static void para_cmd(char *cmd)
1097 {
1098 int ret, fds[3] = {0, 1, 1};
1099 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1100
1101 outputf(COLOR_COMMAND, "%s", c);
1102 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1103 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1104 free(c);
1105 if (ret < 0)
1106 return;
1107 command_fds[0] = fds[1];
1108 command_fds[1] = fds[2];
1109 send_output();
1110 }
1111
1112 /*
1113 * exec command and print output to bot win
1114 */
1115 static void display_cmd(char *cmd)
1116 {
1117 int fds[3] = {0, 1, 1};
1118
1119 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1120 outputf(COLOR_COMMAND, "%s", cmd);
1121 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1122 return;
1123 command_fds[0] = fds[1];
1124 command_fds[1] = fds[2];
1125 send_output();
1126 }
1127
1128 /*
1129 * shutdown curses and stat pipe before executing external commands
1130 */
1131 static void external_cmd(char *cmd)
1132 {
1133 int fds[3] = {-1, -1, -1};
1134
1135 if (cmd_pid)
1136 return;
1137 shutdown_curses();
1138 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1139 return;
1140 cmd_died = 0;
1141 do_select(EXTERNAL_MODE);
1142 init_curses();
1143 }
1144
1145 static void print_scroll_msg(void)
1146 {
1147 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1148 int first_rbe = first_visible_rbe(&lines_total);
1149 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1150 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1151 }
1152
1153 static void com_scroll_top(void)
1154 {
1155 int i = RINGBUFFER_SIZE - 1;
1156 unsigned lines = 0;
1157
1158 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1159 i--;
1160 /* i is oldest entry */
1161 for (; lines < bot.lines && i >= 0; i--) {
1162 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1163 if (!rbe)
1164 break;
1165 lines += NUM_LINES(strlen(rbe->msg));
1166 }
1167 i++;
1168 if (lines > 0 && scroll_position != i) {
1169 scroll_position = i;
1170 redraw_bot_win();
1171 print_scroll_msg();
1172 return;
1173 }
1174 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1175 }
1176
1177 static void com_cancel_scrolling(void)
1178 {
1179
1180 if (scroll_position == 0) {
1181 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1182 return;
1183 }
1184 scroll_position = 0;
1185 redraw_bot_win();
1186 }
1187
1188 static void com_page_down(void)
1189 {
1190 unsigned lines = 0;
1191 int i = scroll_position;
1192 while (lines < bot.lines && --i > 0) {
1193 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1194 if (!rbe)
1195 break;
1196 lines += NUM_LINES(strlen(rbe->msg));
1197 }
1198 if (lines) {
1199 scroll_position = i;
1200 redraw_bot_win();
1201 print_scroll_msg();
1202 return;
1203 }
1204 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1205 }
1206
1207 static void com_page_up(void)
1208 {
1209 unsigned lines;
1210 int fvr = first_visible_rbe(&lines);
1211
1212 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1213 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1214 return;
1215 }
1216 scroll_position = fvr + 1;
1217 for (; scroll_position > 0; scroll_position--) {
1218 first_visible_rbe(&lines);
1219 if (lines == bot.lines)
1220 break;
1221 }
1222 redraw_bot_win();
1223 print_scroll_msg();
1224 }
1225
1226 static void com_scroll_down(void)
1227 {
1228 struct rb_entry *rbe;
1229 int rbe_lines;
1230
1231 if (!scroll_position) {
1232 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1233 return;
1234 }
1235 scroll_position--;
1236 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1237 rbe_lines = NUM_LINES(rbe->len);
1238 wscrl(bot.win, rbe_lines);
1239 wmove(bot.win, bot.lines - rbe_lines, 0);
1240 wattron(bot.win, COLOR_PAIR(rbe->color));
1241 waddstr(bot.win, rbe->msg);
1242 wrefresh(bot.win);
1243 print_scroll_msg();
1244 }
1245
1246 static void com_scroll_up(void)
1247 {
1248 struct rb_entry *rbe = NULL;
1249 unsigned lines;
1250 int i, first_rbe, num_scroll;
1251
1252 /* the entry that is going to vanish */
1253 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1254 if (!rbe)
1255 goto err_out;
1256 num_scroll = NUM_LINES(rbe->len);
1257 first_rbe = first_visible_rbe(&lines);
1258 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1259 goto err_out;
1260 scroll_position++;
1261 wscrl(bot.win, -num_scroll);
1262 i = draw_top_rbe(&lines);
1263 if (i < 0)
1264 goto err_out;
1265 while (i > 0 && lines < num_scroll) {
1266 int rbe_lines;
1267 rbe = ringbuffer_get(bot_win_rb, --i);
1268 if (!rbe)
1269 break;
1270 rbe_lines = NUM_LINES(rbe->len);
1271 lines += rbe_lines;
1272 // fprintf(stderr, "msg: %s\n", rbe->msg);
1273 wattron(bot.win, COLOR_PAIR(rbe->color));
1274 waddstr(bot.win, "\n");
1275 waddstr(bot.win, rbe->msg);
1276 if (!i)
1277 break;
1278 i--;
1279 }
1280 wrefresh(bot.win);
1281 print_scroll_msg();
1282 return;
1283 err_out:
1284 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1285 }
1286
1287 static void com_ll_decr(void)
1288 {
1289 if (loglevel <= LL_DEBUG) {
1290 print_in_bar(COLOR_ERRMSG,
1291 "loglevel already at maximal verbosity\n");
1292 return;
1293 }
1294 loglevel--;
1295 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1296 }
1297
1298 static void com_ll_incr(void)
1299 {
1300 if (loglevel >= LL_EMERG) {
1301 print_in_bar(COLOR_ERRMSG,
1302 "loglevel already at minimal verbosity\n");
1303 return;
1304 }
1305 loglevel++;
1306 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1307 }
1308
1309 /*
1310 * reread configuration, terminate on errors
1311 */
1312 static void com_reread_conf(void)
1313 {
1314 char *cf =configfile_exists();
1315 struct gui_cmdline_parser_params params = {
1316 .override = 1,
1317 .initialize = 1,
1318 .check_required = 0,
1319 .check_ambiguity = 0,
1320 .print_errors = 0,
1321 };
1322
1323 if (!cf) {
1324 PARA_WARNING_LOG("there is no configuration to read");
1325 return;
1326 }
1327 PARA_INFO_LOG("rereading command line options and config file");
1328 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1329 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1330 PARA_EMERG_LOG("errors in config file");
1331 finish(EXIT_FAILURE);
1332 }
1333 PARA_NOTICE_LOG("config file reloaded");
1334 if (check_key_map_args() < 0)
1335 finish(EXIT_FAILURE);
1336 }
1337
1338 static void com_help(void)
1339 {
1340 int i;
1341
1342 for (i = 0; i < conf.key_map_given; ++i) {
1343 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1344 const char *handler_text = "???", *desc = NULL;
1345
1346 if (!split_key_map(tmp, &handler, &arg)) {
1347 free(tmp);
1348 return;
1349 }
1350 switch (*handler) {
1351 case 'i':
1352 handler_text = "internal";
1353 desc = command_list[find_cmd_byname(arg)].description;
1354 break;
1355 case 'x': handler_text = "external"; break;
1356 case 'd': handler_text = "display "; break;
1357 case 'p': handler_text = "para "; break;
1358 }
1359 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1360 strlen(arg) < 8? "\t" : "",
1361 desc? desc : "");
1362 free(tmp);
1363 }
1364 for (i = 0; command_list[i].handler; i++) {
1365 struct gui_command gc = command_list[i];
1366
1367 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1368 strlen(gc.name) < 8? "\t" : "",
1369 gc.description);
1370 }
1371 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1372 "for more info");
1373 }
1374
1375 static void com_shrink_top_win(void)
1376 {
1377 if (top.lines <= theme.top_lines_min) {
1378 PARA_WARNING_LOG("can not decrease top window");
1379 return;
1380 }
1381 init_wins(top.lines - 1);
1382 wclear(top.win);
1383 print_all_items();
1384 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1385 }
1386
1387 static void com_enlarge_top_win(void)
1388 {
1389 if (bot.lines < 3) {
1390 PARA_WARNING_LOG("can not increase top window");
1391 return;
1392 }
1393 init_wins(top.lines + 1);
1394 wclear(top.win);
1395 print_all_items();
1396 print_in_bar(COLOR_MSG, "increased top window");
1397 }
1398
1399 static void com_version(void)
1400 {
1401 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1402 CODENAME "\"");
1403 }
1404
1405 __noreturn static void com_quit(void)
1406 {
1407 finish(0);
1408 }
1409
1410 static void com_refresh(void)
1411 {
1412 shutdown_curses();
1413 init_curses();
1414 }
1415
1416 static void change_theme(int next)
1417 {
1418 if (next)
1419 next_theme(&theme);
1420 else
1421 prev_theme(&theme);
1422 /* This seems to be needed twice, why? */
1423 com_refresh();
1424 com_refresh();
1425 PARA_NOTICE_LOG("new theme: %s", theme.name);
1426 }
1427
1428 static void com_next_theme(void)
1429 {
1430 change_theme(1);
1431 }
1432
1433 static void com_prev_theme(void)
1434 {
1435 change_theme(0);
1436 }
1437
1438
1439 static void handle_command(int c)
1440 {
1441 int i;
1442
1443 /* first check user's key bindings */
1444 for (i = 0; i < conf.key_map_given; ++i) {
1445 char *tmp, *handler, *arg;
1446
1447 tmp = para_strdup(conf.key_map_arg[i]);
1448 if (!split_key_map(tmp, &handler, &arg)) {
1449 free(tmp);
1450 return;
1451 }
1452 if (strcmp(tmp, km_keyname(c))) {
1453 free(tmp);
1454 continue;
1455 }
1456 if (*handler == 'd')
1457 display_cmd(arg);
1458 else if (*handler == 'x')
1459 external_cmd(arg);
1460 else if (*handler == 'p')
1461 para_cmd(arg);
1462 else if (*handler == 'i') {
1463 int num = find_cmd_byname(arg);
1464 if (num >= 0)
1465 command_list[num].handler();
1466 }
1467 free(tmp);
1468 return;
1469 }
1470 /* not found, check internal key bindings */
1471 for (i = 0; command_list[i].handler; i++) {
1472 if (!strcmp(km_keyname(c), command_list[i].key)) {
1473 command_list[i].handler();
1474 return;
1475 }
1476 }
1477 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1478 km_keyname(c));
1479 }
1480
1481 int main(int argc, char *argv[])
1482 {
1483 int ret;
1484 char *cf;
1485
1486 _argc = argc;
1487 _argv = argv;
1488
1489 if (gui_cmdline_parser(argc, argv, &conf) != 0)
1490 exit(EXIT_FAILURE);
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 }