gui: Check return value of para_exec_cmdline_pid().
[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_pipe = -1;
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, __a_unused void *data)
489 {
490 if (!curses_active)
491 return 1;
492 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
493 return 1;
494 }
495
496 static int loglevel;
497
498 __printf_2_3 void curses_log(int ll, const char *fmt,...)
499 {
500 int color;
501 char *msg;
502 va_list ap;
503
504 if (ll < loglevel || !curses_active)
505 return;
506 switch (ll) {
507 case LL_DEBUG:
508 case LL_INFO:
509 case LL_NOTICE:
510 color = COLOR_MSG;
511 break;
512 default:
513 color = COLOR_ERRMSG;
514 }
515 va_start(ap, fmt);
516 xvasprintf(&msg, fmt, ap);
517 va_end(ap);
518 chop(msg);
519 rb_add_entry(color, msg);
520 wrefresh(bot.win);
521 }
522 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
523
524 static void setup_signal_handling(void)
525 {
526 signal_pipe = para_signal_init();
527 para_install_sighandler(SIGINT);
528 para_install_sighandler(SIGTERM);
529 para_install_sighandler(SIGCHLD);
530 para_install_sighandler(SIGWINCH);
531 para_install_sighandler(SIGUSR1);
532 para_sigaction(SIGHUP, SIG_IGN);
533 }
534
535 __noreturn static void do_exit(int ret)
536 {
537 para_sigaction(SIGTERM, SIG_IGN);
538 kill(0, SIGTERM);
539 exit(ret);
540 }
541
542 static void shutdown_curses(void)
543 {
544 if (!curses_active)
545 return;
546 def_prog_mode();
547 curses_active = 0;
548 endwin();
549 }
550
551 __noreturn static void finish(int ret)
552 {
553 shutdown_curses();
554 do_exit(ret);
555 }
556
557 /*
558 * exit curses and print given message to stdout/stderr
559 */
560 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
561 {
562 va_list argp;
563 FILE *outfd = ret? stderr: stdout;
564
565 shutdown_curses();
566 va_start(argp, fmt);
567 vfprintf(outfd, fmt, argp);
568 va_end(argp);
569 do_exit(ret);
570 }
571
572 static void print_welcome(void)
573 {
574 if (loglevel > LL_NOTICE)
575 return;
576 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
577 " \"" CODENAME "\". Theme: %s", theme.name);
578 wclrtoeol(bot.win);
579 }
580
581 /*
582 * init all windows
583 */
584 static void init_wins(int top_lines)
585 {
586 int i;
587
588 top.lines = top_lines;
589 top.cols = COLS;
590 top.begy = 0;
591 top.begx = 0;
592
593 bot.lines = LINES - top.lines - 3;
594 bot.cols = COLS;
595 bot.begy = top.lines + 1;
596 bot.begx = 0;
597
598 sb.lines = 1;
599 sb.cols = COLS;
600 sb.begy = LINES - 2;
601 sb.begx = 0;
602
603 in.lines = 1;
604 in.cols = COLS;
605 in.begy = LINES - 1;
606 in.begx = 0;
607
608 sep.lines = 1;
609 sep.cols = COLS;
610 sep.begy = top.lines;
611 sep.begx = 0;
612
613 assume_default_colors(theme.default_fg, theme.default_bg);
614 if (top.win) {
615 mvwin(top.win, top.begy, top.begx);
616 wresize(top.win, top.lines, top.cols);
617
618 mvwin(sb.win, sb.begy, sb.begx);
619 wresize(sb.win, sb.lines, sb.cols);
620
621 mvwin(sep.win, sep.begy, sep.begx);
622 wresize(sep.win, sep.lines, sep.cols);
623
624 mvwin(bot.win, bot.begy, bot.begx);
625 wresize(bot.win, bot.lines, bot.cols);
626
627 mvwin(in.win, in.begy, in.begx);
628 wresize(in.win, in.lines, in.cols);
629 } else {
630 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
631 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
632 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
633 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
634 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
635 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
636 msg_n_exit(1, "Error: Cannot create curses windows\n");
637 wclear(bot.win);
638 wclear(sb.win);
639 wclear(in.win);
640 scrollok(bot.win, 1);
641 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
642 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
643 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
644 wattron(top.win, COLOR_PAIR(COLOR_TOP));
645 nodelay(top.win, 1);
646 nodelay(bot.win, 1);
647 nodelay(sb.win, 1);
648 nodelay(in.win, 0);
649
650 keypad(top.win, 1);
651 keypad(bot.win, 1);
652 keypad(sb.win, 1);
653 keypad(in.win, 1);
654 print_status_bar();
655 }
656 wmove(sep.win, 0, 0);
657 for (i = 1; i <= COLS; i++)
658 waddstr(sep.win, theme.sep_str);
659 wclear(top.win);
660 //wclear(bot.win);
661 wnoutrefresh(top.win);
662 wnoutrefresh(bot.win);
663 //wnoutrefresh(sb.win);
664 print_status_bar();
665 wnoutrefresh(in.win);
666 wnoutrefresh(sep.win);
667 doupdate();
668 }
669
670 /*
671 * Print stat item #i to curses window
672 */
673 static void print_stat_item(int i)
674 {
675 char *tmp;
676 struct stat_item_data d = theme.data[i];
677 char *c = stat_content[i];
678
679 if (!curses_active || !d.len || !c)
680 return;
681 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
682 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
683 wrefresh(top.win);
684 wattron(top.win, COLOR_PAIR(i + 1));
685 align_str(top.win, tmp, d.len * COLS / 100, d.align);
686 free(tmp);
687 wrefresh(top.win);
688 }
689
690 static int update_item(int item_num, char *buf)
691 {
692 char **c = stat_content + item_num;
693
694 free(*c);
695 if (buf && buf[0])
696 goto dup;
697 switch (item_num) {
698 case SI_ARTIST:
699 *c = para_strdup("(artist tag not set)");
700 goto print;
701 case SI_TITLE:
702 *c = para_strdup("(title tag not set)");
703 goto print;
704 case SI_YEAR:
705 *c = para_strdup("????");
706 goto print;
707 case SI_ALBUM:
708 *c = para_strdup("(album tag not set)");
709 goto print;
710 case SI_COMMENT:
711 *c = para_strdup("(comment tag not set)");
712 goto print;
713 }
714 dup:
715 *c = para_strdup(buf);
716 print:
717 print_stat_item(item_num);
718 return 1;
719 }
720
721 static int read_stat_pipe(fd_set *rfds)
722 {
723 static char *buf;
724 static int bufsize, loaded;
725 int ret, ret2;
726 size_t sz;
727
728 if (stat_pipe < 0)
729 return 0;
730 if (loaded >= bufsize) {
731 if (bufsize > 1000 * 1000) {
732 loaded = 0;
733 return 0;
734 }
735 bufsize += bufsize + 1000;
736 buf = para_realloc(buf, bufsize);
737 }
738 assert(loaded < bufsize);
739 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
740 rfds, &sz);
741 loaded += sz;
742 ret2 = for_each_stat_item(buf, loaded, update_item);
743 if (ret < 0 || ret2 < 0) {
744 loaded = 0;
745 return ret2 < 0? ret2 : ret;
746 }
747 sz = ret2; /* what is left */
748 if (sz > 0 && sz < loaded)
749 memmove(buf, buf + loaded - sz, sz);
750 loaded = sz;
751 return 1;
752 }
753
754 static void print_all_items(void)
755 {
756 int i;
757
758 if (!curses_active)
759 return;
760 FOR_EACH_STATUS_ITEM(i)
761 print_stat_item(i);
762 }
763
764 static void clear_all_items(void)
765 {
766 int i;
767
768 FOR_EACH_STATUS_ITEM(i) {
769 free(stat_content[i]);
770 stat_content[i] = para_strdup("");
771 }
772 }
773
774 static void init_pair_or_die(short pair, short f, short b)
775 {
776 if (init_pair(pair, f, b) == ERR)
777 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
778 }
779
780 static void init_colors_or_die(void)
781 {
782 int i;
783
784 if (!has_colors())
785 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
786 if (start_color() == ERR)
787 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
788 FOR_EACH_STATUS_ITEM(i)
789 if (theme.data[i].len)
790 init_pair_or_die(i + 1, theme.data[i].fg,
791 theme.data[i].bg);
792 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
793 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
794 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
795 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
796 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
797 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
798 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
799 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
800 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
801 }
802
803 /* (Re-)initialize the curses library. */
804 static void init_curses(void)
805 {
806 curses_active = 1;
807 if (top.win && refresh() == ERR) /* refesh is really needed */
808 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
809 if (LINES < theme.lines_min || COLS < theme.cols_min)
810 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
811 " (need at least %dx%d)\n", COLS, LINES,
812 theme.cols_min, theme.lines_min);
813 curs_set(0); /* make cursor invisible, ignore errors */
814 nonl(); /* do not NL->CR/NL on output, always returns OK */
815 /* don't echo input */
816 if (noecho() == ERR)
817 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
818 /* take input chars one at a time, no wait for \n */
819 if (cbreak() == ERR)
820 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
821 init_colors_or_die();
822 clear(); /* ignore non-fatal errors */
823 init_wins(theme.top_lines_default);
824 print_all_items();
825 // noecho(); /* don't echo input */
826 }
827
828 static void check_sigchld(void)
829 {
830 int ret;
831 pid_t pid;
832 reap_next_child:
833 ret = para_reap_child(&pid);
834 if (ret <= 0)
835 return;
836 if (pid == cmd_pid) {
837 cmd_pid = 0;
838 cmd_died = 1;
839 }
840 goto reap_next_child;
841 }
842
843 /*
844 * This sucker modifies its first argument. *handler and *arg are
845 * pointers to 0-terminated strings (inside line). Crap.
846 */
847 static int split_key_map(char *line, char **handler, char **arg)
848 {
849 if (!(*handler = strchr(line + 1, ':')))
850 goto err_out;
851 **handler = '\0';
852 (*handler)++;
853 if (!(*arg = strchr(*handler, ':')))
854 goto err_out;
855 **arg = '\0';
856 (*arg)++;
857 return 1;
858 err_out:
859 return 0;
860 }
861
862 static int check_key_map_args(void)
863 {
864 char *s;
865 int i, ret = -1;
866 char *tmp = NULL, *handler, *arg;
867
868 for (i = 0; i < conf.key_map_given; ++i) {
869 s = conf.key_map_arg[i];
870 if (!(*s))
871 goto err_out;
872 free(tmp);
873 tmp = para_strdup(s);
874 if (!split_key_map(tmp, &handler, &arg))
875 goto err_out;
876 if (strlen(handler) != 1)
877 goto err_out;
878 if (*handler != 'x'
879 && *handler != 'd'
880 && *handler != 'i'
881 && *handler != 'p')
882 goto err_out;
883 if (*handler != 'i')
884 continue;
885 if (find_cmd_byname(arg) < 0)
886 goto err_out;
887 }
888 ret = 0;
889 err_out:
890 free(tmp);
891 return ret;
892 }
893
894 /*
895 * React to various signal-related events
896 */
897 static void handle_signal(int sig)
898 {
899 switch (sig) {
900 case SIGTERM:
901 msg_n_exit(EXIT_FAILURE,
902 "only the good die young (caught SIGTERM))\n");
903 return;
904 case SIGWINCH:
905 if (curses_active) {
906 shutdown_curses();
907 init_curses();
908 redraw_bot_win();
909 }
910 return;
911 case SIGINT:
912 PARA_WARNING_LOG("caught SIGINT, reset");
913 /* Nothing to do. SIGINT killed our child which gets noticed
914 * by do_select and resets everything.
915 */
916 return;
917 case SIGUSR1:
918 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
919 com_reread_conf();
920 return;
921 case SIGCHLD:
922 check_sigchld();
923 return;
924 }
925 }
926
927 static int open_stat_pipe(void)
928 {
929 static int init = 1;
930 int ret, fds[3] = {0, 1, 0};
931 pid_t pid;
932
933 if (init)
934 init = 0;
935 else
936 /*
937 * Sleep a bit to avoid a busy loop. As the call to sleep() may
938 * be interrupted by SIGCHLD, we simply wait until the call
939 * succeeds.
940 */
941 while (sleep(2))
942 ; /* nothing */
943 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
944 if (ret < 0)
945 return ret;
946 ret = mark_fd_nonblocking(fds[1]);
947 if (ret >= 0)
948 return fds[1];
949 close(fds[1]);
950 return ret;
951 }
952
953 /*
954 * This is the core select loop. Besides the (internal) signal
955 * pipe, the following other fds are checked according to the mode:
956 *
957 * GETCH_MODE: check stdin, return when key is pressed
958 *
959 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
960 * of output has been read or when other end has closed command pipe or
961 * 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;
971 int max_fileno;
972 char command_buf[4096] = "";
973 int cbo = 0; /* command buf offset */
974 struct timeval tv;
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 (command_pipe >= 0 && mode == COMMAND_MODE)
989 para_fd_set(command_pipe, &rfds, &max_fileno);
990 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
991 if (ret <= 0)
992 goto check_return; /* skip fd checks */
993 /* signals */
994 ret = para_next_signal(&rfds);
995 if (ret > 0)
996 handle_signal(ret);
997 /* read command pipe if ready */
998 if (command_pipe >= 0 && mode == COMMAND_MODE) {
999 size_t sz;
1000 ret = read_nonblock(command_pipe, command_buf + cbo,
1001 sizeof(command_buf) - 1 - cbo, &rfds, &sz);
1002 cbo += sz;
1003 sz = cbo;
1004 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
1005 if (sz != cbo)
1006 wrefresh(bot.win);
1007 if (ret < 0) {
1008 PARA_NOTICE_LOG("closing command pipe: %s",
1009 para_strerror(-ret));
1010 close(command_pipe);
1011 command_pipe = -1;
1012 return 0;
1013 }
1014 }
1015 ret = read_stat_pipe(&rfds);
1016 if (ret < 0) {
1017 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1018 close(stat_pipe);
1019 stat_pipe = -1;
1020 clear_all_items();
1021 free(stat_content[SI_BASENAME]);
1022 stat_content[SI_BASENAME] =
1023 para_strdup("stat command terminated!?");
1024 print_all_items();
1025 }
1026 check_return:
1027 switch (mode) {
1028 case COMMAND_MODE:
1029 ret = wgetch(top.win);
1030 if (ret != ERR && ret != KEY_RESIZE) {
1031 if (command_pipe) {
1032 close(command_pipe);
1033 command_pipe = -1;
1034 }
1035 if (cmd_pid)
1036 kill(cmd_pid, SIGTERM);
1037 return -1;
1038 }
1039 break;
1040 case GETCH_MODE:
1041 ret = wgetch(top.win);
1042 if (ret != ERR && ret != KEY_RESIZE)
1043 return ret;
1044 break;
1045 case EXTERNAL_MODE:
1046 if (cmd_died) {
1047 cmd_died = 0;
1048 return 0;
1049 }
1050 }
1051 goto repeat;
1052 }
1053
1054 /*
1055 * read from command pipe and print data to bot window
1056 */
1057 static void send_output(void)
1058 {
1059 int ret;
1060
1061 if (command_pipe < 0)
1062 return;
1063 ret = mark_fd_nonblocking(command_pipe);
1064 if (ret < 0) {
1065 close(command_pipe);
1066 return;
1067 }
1068 if (do_select(COMMAND_MODE) >= 0)
1069 PARA_INFO_LOG("command complete");
1070 else
1071 PARA_NOTICE_LOG("command aborted");
1072 print_in_bar(COLOR_MSG, " ");
1073 }
1074
1075 static void para_cmd(char *cmd)
1076 {
1077 int ret, fds[3] = {0, 1, 0};
1078 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1079
1080 outputf(COLOR_COMMAND, "%s", c);
1081 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1082 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1083 free(c);
1084 if (ret < 0)
1085 return;
1086 command_pipe = fds[1];
1087 send_output();
1088 }
1089
1090 /*
1091 * exec command and print output to bot win
1092 */
1093 static void display_cmd(char *cmd)
1094 {
1095 int fds[3] = {0, 1, 0};
1096
1097 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1098 outputf(COLOR_COMMAND, "%s", cmd);
1099 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1100 return;
1101 command_pipe = fds[1];
1102 send_output();
1103 }
1104
1105 /*
1106 * shutdown curses and stat pipe before executing external commands
1107 */
1108 static void external_cmd(char *cmd)
1109 {
1110 int fds[3] = {-1, -1, -1};
1111
1112 if (cmd_pid)
1113 return;
1114 shutdown_curses();
1115 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1116 return;
1117 cmd_died = 0;
1118 do_select(EXTERNAL_MODE);
1119 init_curses();
1120 }
1121
1122 static void print_scroll_msg(void)
1123 {
1124 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1125 int first_rbe = first_visible_rbe(&lines_total);
1126 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1127 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1128 }
1129
1130 static void com_scroll_top(void)
1131 {
1132 int i = RINGBUFFER_SIZE - 1;
1133 unsigned lines = 0;
1134
1135 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1136 i--;
1137 /* i is oldest entry */
1138 for (; lines < bot.lines && i >= 0; i--) {
1139 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1140 if (!rbe)
1141 break;
1142 lines += NUM_LINES(strlen(rbe->msg));
1143 }
1144 i++;
1145 if (lines > 0 && scroll_position != i) {
1146 scroll_position = i;
1147 redraw_bot_win();
1148 print_scroll_msg();
1149 return;
1150 }
1151 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1152 }
1153
1154 static void com_cancel_scrolling(void)
1155 {
1156
1157 if (scroll_position == 0) {
1158 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1159 return;
1160 }
1161 scroll_position = 0;
1162 redraw_bot_win();
1163 }
1164
1165 static void com_page_down(void)
1166 {
1167 unsigned lines = 0;
1168 int i = scroll_position;
1169 while (lines < bot.lines && --i > 0) {
1170 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1171 if (!rbe)
1172 break;
1173 lines += NUM_LINES(strlen(rbe->msg));
1174 }
1175 if (lines) {
1176 scroll_position = i;
1177 redraw_bot_win();
1178 print_scroll_msg();
1179 return;
1180 }
1181 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1182 }
1183
1184 static void com_page_up(void)
1185 {
1186 unsigned lines;
1187 int fvr = first_visible_rbe(&lines);
1188
1189 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1190 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1191 return;
1192 }
1193 scroll_position = fvr + 1;
1194 for (; scroll_position > 0; scroll_position--) {
1195 first_visible_rbe(&lines);
1196 if (lines == bot.lines)
1197 break;
1198 }
1199 redraw_bot_win();
1200 print_scroll_msg();
1201 }
1202
1203 static void com_scroll_down(void)
1204 {
1205 struct rb_entry *rbe;
1206 int rbe_lines;
1207
1208 if (!scroll_position) {
1209 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1210 return;
1211 }
1212 scroll_position--;
1213 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1214 rbe_lines = NUM_LINES(rbe->len);
1215 wscrl(bot.win, rbe_lines);
1216 wmove(bot.win, bot.lines - rbe_lines, 0);
1217 wattron(bot.win, COLOR_PAIR(rbe->color));
1218 waddstr(bot.win, rbe->msg);
1219 wrefresh(bot.win);
1220 print_scroll_msg();
1221 }
1222
1223 static void com_scroll_up(void)
1224 {
1225 struct rb_entry *rbe = NULL;
1226 unsigned lines;
1227 int i, first_rbe, num_scroll;
1228
1229 /* the entry that is going to vanish */
1230 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1231 if (!rbe)
1232 goto err_out;
1233 num_scroll = NUM_LINES(rbe->len);
1234 first_rbe = first_visible_rbe(&lines);
1235 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1236 goto err_out;
1237 scroll_position++;
1238 wscrl(bot.win, -num_scroll);
1239 i = draw_top_rbe(&lines);
1240 if (i < 0)
1241 goto err_out;
1242 while (i > 0 && lines < num_scroll) {
1243 int rbe_lines;
1244 rbe = ringbuffer_get(bot_win_rb, --i);
1245 if (!rbe)
1246 break;
1247 rbe_lines = NUM_LINES(rbe->len);
1248 lines += rbe_lines;
1249 // fprintf(stderr, "msg: %s\n", rbe->msg);
1250 wattron(bot.win, COLOR_PAIR(rbe->color));
1251 waddstr(bot.win, "\n");
1252 waddstr(bot.win, rbe->msg);
1253 if (!i)
1254 break;
1255 i--;
1256 }
1257 wrefresh(bot.win);
1258 print_scroll_msg();
1259 return;
1260 err_out:
1261 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1262 }
1263
1264 static void com_ll_decr(void)
1265 {
1266 if (loglevel <= LL_DEBUG) {
1267 print_in_bar(COLOR_ERRMSG,
1268 "loglevel already at maximal verbosity\n");
1269 return;
1270 }
1271 loglevel--;
1272 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1273 }
1274
1275 static void com_ll_incr(void)
1276 {
1277 if (loglevel >= LL_EMERG) {
1278 print_in_bar(COLOR_ERRMSG,
1279 "loglevel already at minimal verbosity\n");
1280 return;
1281 }
1282 loglevel++;
1283 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1284 }
1285
1286 /*
1287 * reread configuration, terminate on errors
1288 */
1289 static void com_reread_conf(void)
1290 {
1291 char *cf =configfile_exists();
1292 struct gui_cmdline_parser_params params = {
1293 .override = 1,
1294 .initialize = 1,
1295 .check_required = 0,
1296 .check_ambiguity = 0,
1297 .print_errors = 0,
1298 };
1299
1300 if (!cf) {
1301 PARA_WARNING_LOG("there is no configuration to read");
1302 return;
1303 }
1304 PARA_INFO_LOG("rereading command line options and config file");
1305 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1306 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1307 PARA_EMERG_LOG("errors in config file");
1308 finish(EXIT_FAILURE);
1309 }
1310 PARA_NOTICE_LOG("config file reloaded");
1311 if (check_key_map_args() < 0)
1312 finish(EXIT_FAILURE);
1313 }
1314
1315 static void com_help(void)
1316 {
1317 int i;
1318
1319 for (i = 0; i < conf.key_map_given; ++i) {
1320 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1321 const char *handler_text = "???", *desc = NULL;
1322
1323 if (!split_key_map(tmp, &handler, &arg)) {
1324 free(tmp);
1325 return;
1326 }
1327 switch (*handler) {
1328 case 'i':
1329 handler_text = "internal";
1330 desc = command_list[find_cmd_byname(arg)].description;
1331 break;
1332 case 'x': handler_text = "external"; break;
1333 case 'd': handler_text = "display "; break;
1334 case 'p': handler_text = "para "; break;
1335 }
1336 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1337 strlen(arg) < 8? "\t" : "",
1338 desc? desc : "");
1339 free(tmp);
1340 }
1341 for (i = 0; command_list[i].handler; i++) {
1342 struct gui_command gc = command_list[i];
1343
1344 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1345 strlen(gc.name) < 8? "\t" : "",
1346 gc.description);
1347 }
1348 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1349 "for more info");
1350 }
1351
1352 static void com_shrink_top_win(void)
1353 {
1354 if (top.lines <= theme.top_lines_min) {
1355 PARA_WARNING_LOG("can not decrease top window");
1356 return;
1357 }
1358 init_wins(top.lines - 1);
1359 wclear(top.win);
1360 print_all_items();
1361 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1362 }
1363
1364 static void com_enlarge_top_win(void)
1365 {
1366 if (bot.lines < 3) {
1367 PARA_WARNING_LOG("can not increase top window");
1368 return;
1369 }
1370 init_wins(top.lines + 1);
1371 wclear(top.win);
1372 print_all_items();
1373 print_in_bar(COLOR_MSG, "increased top window");
1374 }
1375
1376 static void com_version(void)
1377 {
1378 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1379 CODENAME "\"");
1380 }
1381
1382 __noreturn static void com_quit(void)
1383 {
1384 finish(0);
1385 }
1386
1387 static void com_refresh(void)
1388 {
1389 shutdown_curses();
1390 init_curses();
1391 }
1392
1393 static void change_theme(int next)
1394 {
1395 if (next)
1396 next_theme(&theme);
1397 else
1398 prev_theme(&theme);
1399 /* This seems to be needed twice, why? */
1400 com_refresh();
1401 com_refresh();
1402 PARA_NOTICE_LOG("new theme: %s", theme.name);
1403 }
1404
1405 static void com_next_theme(void)
1406 {
1407 change_theme(1);
1408 }
1409
1410 static void com_prev_theme(void)
1411 {
1412 change_theme(0);
1413 }
1414
1415
1416 static void handle_command(int c)
1417 {
1418 int i;
1419
1420 /* first check user's key bindings */
1421 for (i = 0; i < conf.key_map_given; ++i) {
1422 char *tmp, *handler, *arg;
1423
1424 tmp = para_strdup(conf.key_map_arg[i]);
1425 if (!split_key_map(tmp, &handler, &arg)) {
1426 free(tmp);
1427 return;
1428 }
1429 if (strcmp(tmp, km_keyname(c))) {
1430 free(tmp);
1431 continue;
1432 }
1433 if (*handler == 'd')
1434 display_cmd(arg);
1435 else if (*handler == 'x')
1436 external_cmd(arg);
1437 else if (*handler == 'p')
1438 para_cmd(arg);
1439 else if (*handler == 'i') {
1440 int num = find_cmd_byname(arg);
1441 if (num >= 0)
1442 command_list[num].handler();
1443 }
1444 free(tmp);
1445 return;
1446 }
1447 /* not found, check internal key bindings */
1448 for (i = 0; command_list[i].handler; i++) {
1449 if (!strcmp(km_keyname(c), command_list[i].key)) {
1450 command_list[i].handler();
1451 return;
1452 }
1453 }
1454 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1455 km_keyname(c));
1456 }
1457
1458 int main(int argc, char *argv[])
1459 {
1460 int ret;
1461 char *cf;
1462
1463 _argc = argc;
1464 _argv = argv;
1465
1466 if (gui_cmdline_parser(argc, argv, &conf) != 0)
1467 exit(EXIT_FAILURE);
1468 HANDLE_VERSION_FLAG("gui", conf);
1469 cf = configfile_exists();
1470 if (!cf && conf.config_file_given) {
1471 fprintf(stderr, "can not read config file %s\n",
1472 conf.config_file_arg);
1473 exit(EXIT_FAILURE);
1474 }
1475 if (cf) {
1476 struct gui_cmdline_parser_params params = {
1477 .override = 0,
1478 .initialize = 0,
1479 .check_required = 0,
1480 .check_ambiguity = 0,
1481 .print_errors = 1,
1482 };
1483 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1484 exit(EXIT_FAILURE);
1485 }
1486 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1487 if (check_key_map_args() < 0) {
1488 fprintf(stderr, "invalid key map\n");
1489 exit(EXIT_FAILURE);
1490 }
1491 init_theme_or_die(conf.theme_arg, &theme);
1492 top.lines = theme.top_lines_default;
1493 setup_signal_handling();
1494 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1495 initscr(); /* needed only once, always successful */
1496 init_curses();
1497 print_welcome();
1498 for (;;) {
1499 print_status_bar();
1500 ret = do_select(GETCH_MODE);
1501 if (!ret)
1502 continue;
1503 print_in_bar(COLOR_MSG, " ");
1504 handle_command(ret);
1505 }
1506 }