Change year in copyright message to 2012.
[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
340 if (!curses_active)
341 return;
342 wattron(in.win, COLOR_PAIR(color));
343 PARA_VSPRINTF(fmt, msg);
344 wmove(in.win, 0, 0);
345 align_str(in.win, msg, sb.cols, LEFT);
346 free(msg);
347 wrefresh(in.win);
348 }
349
350 /*
351 * update the status bar
352 */
353 static void print_status_bar(void)
354 {
355 char *tmp;
356
357 if (!curses_active)
358 return;
359 tmp = para_strdup(STANDARD_STATUS_BAR);
360 wmove(sb.win, 0, 0);
361 align_str(sb.win, tmp, sb.cols, CENTER);
362 free(tmp);
363 wrefresh(sb.win);
364 }
365
366 /*
367 * get the number of the oldest rbe that is (partially) visible. On return,
368 * lines contains the sum of the number of lines of all visable entries. If the
369 * first one is only partially visible, lines is greater than bot.lines.
370 */
371 static int first_visible_rbe(unsigned *lines)
372 {
373 int i;
374 *lines = 0;
375 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
376 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
377 int rbe_lines;
378 if (!rbe)
379 return i - 1;
380 // fprintf(stderr, "found: %s\n", rbe->msg);
381 rbe_lines = NUM_LINES(rbe->len);
382 if (rbe_lines > bot.lines)
383 return -1;
384 *lines += rbe_lines;
385 if (*lines >= bot.lines)
386 return i;
387 }
388 return RINGBUFFER_SIZE - 1;
389 }
390
391 static int draw_top_rbe(unsigned *lines)
392 {
393 unsigned len;
394 int offset, fvr = first_visible_rbe(lines);
395 struct rb_entry *rbe;
396
397 if (fvr < 0)
398 return -1;
399 wmove(bot.win, 0, 0);
400 rbe = ringbuffer_get(bot_win_rb, fvr);
401 if (!rbe)
402 return -1;
403 len = strlen(rbe->msg);
404 if (*lines > bot.lines) {
405 /* first rbe is only partially visible */
406 offset = (*lines - bot.lines) * bot.cols;
407 assert(offset <= len);
408 } else
409 offset = 0;
410 wattron(bot.win, COLOR_PAIR(rbe->color));
411 waddstr(bot.win, rbe->msg + offset);
412 *lines = NUM_LINES(len - offset);
413 return fvr;
414 }
415
416 static void redraw_bot_win(void)
417 {
418 unsigned lines;
419 int i;
420
421 wmove(bot.win, 0, 0);
422 wclear(bot.win);
423 i = draw_top_rbe(&lines);
424 if (i <= 0)
425 goto out;
426 while (i > 0 && lines < bot.lines) {
427 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
428 if (!rbe) {
429 lines++;
430 waddstr(bot.win, "\n");
431 continue;
432 }
433 lines += NUM_LINES(rbe->len);
434 wattron(bot.win, COLOR_PAIR(rbe->color));
435 waddstr(bot.win, "\n");
436 waddstr(bot.win, rbe->msg);
437 }
438 out:
439 wrefresh(bot.win);
440 }
441
442 static void rb_add_entry(int color, char *msg)
443 {
444 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
445 int x, y;
446 new->color = color;
447 new->len = strlen(msg);
448 new->msg = msg;
449 old = ringbuffer_add(bot_win_rb, new);
450 // fprintf(stderr, "added: %s\n", new->msg);
451 if (old) {
452 free(old->msg);
453 free(old);
454 }
455 if (scroll_position) {
456 /* discard current scrolling, like xterm does */
457 scroll_position = 0;
458 redraw_bot_win();
459 return;
460 }
461 wattron(bot.win, COLOR_PAIR(color));
462 getyx(bot.win, y, x);
463 if (y || x)
464 waddstr(bot.win, "\n");
465 waddstr(bot.win, msg);
466 }
467
468 /*
469 * print formated output to bot win and refresh
470 */
471 __printf_2_3 static void outputf(int color, const char* fmt,...)
472 {
473 char *msg;
474
475 if (!curses_active)
476 return;
477 PARA_VSPRINTF(fmt, msg);
478 rb_add_entry(color, msg);
479 wrefresh(bot.win);
480 }
481
482 static int add_output_line(char *line, __a_unused void *data)
483 {
484 if (!curses_active)
485 return 1;
486 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
487 return 1;
488 }
489
490 static int loglevel;
491
492 __printf_2_3 void curses_log(int ll, const char *fmt,...)
493 {
494 int color;
495 char *msg;
496
497 if (ll < loglevel || !curses_active)
498 return;
499 switch (ll) {
500 case LL_DEBUG:
501 case LL_INFO:
502 case LL_NOTICE:
503 color = COLOR_MSG;
504 break;
505 default:
506 color = COLOR_ERRMSG;
507 }
508 PARA_VSPRINTF(fmt, msg);
509 chop(msg);
510 rb_add_entry(color, msg);
511 wrefresh(bot.win);
512 }
513 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
514
515 static void setup_signal_handling(void)
516 {
517 signal_pipe = para_signal_init();
518 para_install_sighandler(SIGINT);
519 para_install_sighandler(SIGTERM);
520 para_install_sighandler(SIGCHLD);
521 para_install_sighandler(SIGWINCH);
522 para_install_sighandler(SIGUSR1);
523 para_sigaction(SIGHUP, SIG_IGN);
524 }
525
526 __noreturn static void do_exit(int ret)
527 {
528 para_sigaction(SIGTERM, SIG_IGN);
529 kill(0, SIGTERM);
530 exit(ret);
531 }
532
533 static void shutdown_curses(void)
534 {
535 if (!curses_active)
536 return;
537 def_prog_mode();
538 curses_active = 0;
539 endwin();
540 }
541
542 __noreturn static void finish(int ret)
543 {
544 shutdown_curses();
545 do_exit(ret);
546 }
547
548 /*
549 * exit curses and print given message to stdout/stderr
550 */
551 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
552 {
553 va_list argp;
554 FILE *outfd = ret? stderr: stdout;
555
556 shutdown_curses();
557 va_start(argp, fmt);
558 vfprintf(outfd, fmt, argp);
559 va_end(argp);
560 do_exit(ret);
561 }
562
563 static void print_welcome(void)
564 {
565 if (loglevel > LL_NOTICE)
566 return;
567 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
568 " \"" CODENAME "\". Theme: %s", theme.name);
569 wclrtoeol(bot.win);
570 }
571
572 /*
573 * init all windows
574 */
575 static void init_wins(int top_lines)
576 {
577 int i;
578
579 top.lines = top_lines;
580 top.cols = COLS;
581 top.begy = 0;
582 top.begx = 0;
583
584 bot.lines = LINES - top.lines - 3;
585 bot.cols = COLS;
586 bot.begy = top.lines + 1;
587 bot.begx = 0;
588
589 sb.lines = 1;
590 sb.cols = COLS;
591 sb.begy = LINES - 2;
592 sb.begx = 0;
593
594 in.lines = 1;
595 in.cols = COLS;
596 in.begy = LINES - 1;
597 in.begx = 0;
598
599 sep.lines = 1;
600 sep.cols = COLS;
601 sep.begy = top.lines;
602 sep.begx = 0;
603
604 assume_default_colors(theme.default_fg, theme.default_bg);
605 if (top.win) {
606 mvwin(top.win, top.begy, top.begx);
607 wresize(top.win, top.lines, top.cols);
608
609 mvwin(sb.win, sb.begy, sb.begx);
610 wresize(sb.win, sb.lines, sb.cols);
611
612 mvwin(sep.win, sep.begy, sep.begx);
613 wresize(sep.win, sep.lines, sep.cols);
614
615 mvwin(bot.win, bot.begy, bot.begx);
616 wresize(bot.win, bot.lines, bot.cols);
617
618 mvwin(in.win, in.begy, in.begx);
619 wresize(in.win, in.lines, in.cols);
620 } else {
621 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
622 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
623 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
624 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
625 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
626 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
627 msg_n_exit(1, "Error: Cannot create curses windows\n");
628 wclear(bot.win);
629 wclear(sb.win);
630 wclear(in.win);
631 scrollok(bot.win, 1);
632 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
633 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
634 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
635 wattron(top.win, COLOR_PAIR(COLOR_TOP));
636 nodelay(top.win, 1);
637 nodelay(bot.win, 1);
638 nodelay(sb.win, 1);
639 nodelay(in.win, 0);
640
641 keypad(top.win, 1);
642 keypad(bot.win, 1);
643 keypad(sb.win, 1);
644 keypad(in.win, 1);
645 print_status_bar();
646 }
647 wmove(sep.win, 0, 0);
648 for (i = 1; i <= COLS; i++)
649 waddstr(sep.win, theme.sep_str);
650 wclear(top.win);
651 //wclear(bot.win);
652 wnoutrefresh(top.win);
653 wnoutrefresh(bot.win);
654 //wnoutrefresh(sb.win);
655 print_status_bar();
656 wnoutrefresh(in.win);
657 wnoutrefresh(sep.win);
658 doupdate();
659 }
660
661 /*
662 * Print stat item #i to curses window
663 */
664 static void print_stat_item(int i)
665 {
666 char *tmp;
667 struct stat_item_data d = theme.data[i];
668 char *c = stat_content[i];
669
670 if (!curses_active || !d.len || !c)
671 return;
672 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
673 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
674 wrefresh(top.win);
675 wattron(top.win, COLOR_PAIR(i + 1));
676 align_str(top.win, tmp, d.len * COLS / 100, d.align);
677 free(tmp);
678 wrefresh(top.win);
679 }
680
681 static int update_item(int item_num, char *buf)
682 {
683 char **c = stat_content + item_num;
684
685 free(*c);
686 if (buf && buf[0])
687 goto dup;
688 switch (item_num) {
689 case SI_ARTIST:
690 *c = para_strdup("(artist tag not set)");
691 goto print;
692 case SI_TITLE:
693 *c = para_strdup("(title tag not set)");
694 goto print;
695 case SI_YEAR:
696 *c = para_strdup("????");
697 goto print;
698 case SI_ALBUM:
699 *c = para_strdup("(album tag not set)");
700 goto print;
701 case SI_COMMENT:
702 *c = para_strdup("(comment tag not set)");
703 goto print;
704 }
705 dup:
706 *c = para_strdup(buf);
707 print:
708 print_stat_item(item_num);
709 return 1;
710 }
711
712 static int read_stat_pipe(fd_set *rfds)
713 {
714 static char *buf;
715 static int bufsize, loaded;
716 int ret, ret2;
717 size_t sz;
718
719 if (stat_pipe < 0)
720 return 0;
721 if (loaded >= bufsize) {
722 if (bufsize > 1000 * 1000) {
723 loaded = 0;
724 return 0;
725 }
726 bufsize += bufsize + 1000;
727 buf = para_realloc(buf, bufsize);
728 }
729 assert(loaded < bufsize);
730 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
731 rfds, &sz);
732 loaded += sz;
733 ret2 = for_each_stat_item(buf, loaded, update_item);
734 if (ret < 0 || ret2 < 0) {
735 loaded = 0;
736 return ret2 < 0? ret2 : ret;
737 }
738 sz = ret2; /* what is left */
739 if (sz > 0 && sz < loaded)
740 memmove(buf, buf + loaded - sz, sz);
741 loaded = sz;
742 return 1;
743 }
744
745 static void print_all_items(void)
746 {
747 int i;
748
749 if (!curses_active)
750 return;
751 FOR_EACH_STATUS_ITEM(i)
752 print_stat_item(i);
753 }
754
755 static void clear_all_items(void)
756 {
757 int i;
758
759 FOR_EACH_STATUS_ITEM(i) {
760 free(stat_content[i]);
761 stat_content[i] = para_strdup("");
762 }
763 }
764
765 static void init_pair_or_die(short pair, short f, short b)
766 {
767 if (init_pair(pair, f, b) == ERR)
768 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
769 }
770
771 static void init_colors_or_die(void)
772 {
773 int i;
774
775 if (!has_colors())
776 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
777 if (start_color() == ERR)
778 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
779 FOR_EACH_STATUS_ITEM(i)
780 if (theme.data[i].len)
781 init_pair_or_die(i + 1, theme.data[i].fg,
782 theme.data[i].bg);
783 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
784 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
785 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
786 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
787 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
788 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
789 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
790 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
791 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
792 }
793
794 /* (Re-)initialize the curses library. */
795 static void init_curses(void)
796 {
797 curses_active = 1;
798 if (top.win && refresh() == ERR) /* refesh is really needed */
799 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
800 if (LINES < theme.lines_min || COLS < theme.cols_min)
801 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
802 " (need at least %dx%d)\n", COLS, LINES,
803 theme.cols_min, theme.lines_min);
804 curs_set(0); /* make cursor invisible, ignore errors */
805 nonl(); /* do not NL->CR/NL on output, always returns OK */
806 /* don't echo input */
807 if (noecho() == ERR)
808 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
809 /* take input chars one at a time, no wait for \n */
810 if (cbreak() == ERR)
811 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
812 init_colors_or_die();
813 clear(); /* ignore non-fatal errors */
814 init_wins(theme.top_lines_default);
815 print_all_items();
816 // noecho(); /* don't echo input */
817 }
818
819 static void check_sigchld(void)
820 {
821 int ret;
822 pid_t pid;
823 reap_next_child:
824 ret = para_reap_child(&pid);
825 if (ret <= 0)
826 return;
827 if (pid == cmd_pid) {
828 cmd_pid = 0;
829 cmd_died = 1;
830 }
831 goto reap_next_child;
832 }
833
834 /*
835 * This sucker modifies its first argument. *handler and *arg are
836 * pointers to 0-terminated strings (inside line). Crap.
837 */
838 static int split_key_map(char *line, char **handler, char **arg)
839 {
840 if (!(*handler = strchr(line + 1, ':')))
841 goto err_out;
842 **handler = '\0';
843 (*handler)++;
844 if (!(*arg = strchr(*handler, ':')))
845 goto err_out;
846 **arg = '\0';
847 (*arg)++;
848 return 1;
849 err_out:
850 return 0;
851 }
852
853 static int check_key_map_args(void)
854 {
855 char *s;
856 int i, ret = -1;
857 char *tmp = NULL, *handler, *arg;
858
859 for (i = 0; i < conf.key_map_given; ++i) {
860 s = conf.key_map_arg[i];
861 if (!(*s))
862 goto err_out;
863 free(tmp);
864 tmp = para_strdup(s);
865 if (!split_key_map(tmp, &handler, &arg))
866 goto err_out;
867 if (strlen(handler) != 1)
868 goto err_out;
869 if (*handler != 'x'
870 && *handler != 'd'
871 && *handler != 'i'
872 && *handler != 'p')
873 goto err_out;
874 if (*handler != 'i')
875 continue;
876 if (find_cmd_byname(arg) < 0)
877 goto err_out;
878 }
879 ret = 0;
880 err_out:
881 free(tmp);
882 return ret;
883 }
884
885 /*
886 * React to various signal-related events
887 */
888 static void handle_signal(int sig)
889 {
890 switch (sig) {
891 case SIGTERM:
892 msg_n_exit(EXIT_FAILURE,
893 "only the good die young (caught SIGTERM))\n");
894 return;
895 case SIGWINCH:
896 if (curses_active) {
897 shutdown_curses();
898 init_curses();
899 redraw_bot_win();
900 }
901 return;
902 case SIGINT:
903 PARA_WARNING_LOG("caught SIGINT, reset");
904 /* Nothing to do. SIGINT killed our child which gets noticed
905 * by do_select and resets everything.
906 */
907 return;
908 case SIGUSR1:
909 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
910 com_reread_conf();
911 return;
912 case SIGCHLD:
913 check_sigchld();
914 return;
915 }
916 }
917
918 static int open_stat_pipe(void)
919 {
920 static int init = 1;
921 int ret, fds[3] = {0, 1, 0};
922 pid_t pid;
923
924 if (init)
925 init = 0;
926 else
927 /*
928 * Sleep a bit to avoid a busy loop. As the call to sleep() may
929 * be interrupted by SIGCHLD, we simply wait until the call
930 * succeeds.
931 */
932 while (sleep(2))
933 ; /* nothing */
934 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
935 if (ret < 0)
936 return ret;
937 ret = mark_fd_nonblocking(fds[1]);
938 if (ret >= 0)
939 return fds[1];
940 close(fds[1]);
941 return ret;
942 }
943
944 /*
945 * This is the core select loop. Besides the (internal) signal
946 * pipe, the following other fds are checked according to the mode:
947 *
948 * GETCH_MODE: check stdin, return when key is pressed
949 *
950 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
951 * of output has been read or when other end has closed command pipe or
952 * when any key is pressed.
953 *
954 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
955 * is running. During that time curses is disabled. Returns when
956 * cmd_pid == 0.
957 */
958 static int do_select(int mode)
959 {
960 fd_set rfds;
961 int ret;
962 int max_fileno;
963 char command_buf[4096] = "";
964 int cbo = 0; /* command buf offset */
965 struct timeval tv;
966 repeat:
967 tv.tv_sec = conf.timeout_arg / 1000;
968 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
969 // ret = refresh_status();
970 FD_ZERO(&rfds);
971 max_fileno = 0;
972 if (stat_pipe < 0)
973 stat_pipe = open_stat_pipe();
974 if (stat_pipe >= 0)
975 para_fd_set(stat_pipe, &rfds, &max_fileno);
976 /* signal pipe */
977 para_fd_set(signal_pipe, &rfds, &max_fileno);
978 /* command pipe only for COMMAND_MODE */
979 if (command_pipe >= 0 && mode == COMMAND_MODE)
980 para_fd_set(command_pipe, &rfds, &max_fileno);
981 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
982 if (ret <= 0)
983 goto check_return; /* skip fd checks */
984 /* signals */
985 ret = para_next_signal(&rfds);
986 if (ret > 0)
987 handle_signal(ret);
988 /* read command pipe if ready */
989 if (command_pipe >= 0 && mode == COMMAND_MODE) {
990 size_t sz;
991 ret = read_nonblock(command_pipe, command_buf + cbo,
992 sizeof(command_buf) - 1 - cbo, &rfds, &sz);
993 cbo += sz;
994 sz = cbo;
995 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
996 if (sz != cbo)
997 wrefresh(bot.win);
998 if (ret < 0) {
999 PARA_NOTICE_LOG("closing command pipe: %s",
1000 para_strerror(-ret));
1001 close(command_pipe);
1002 command_pipe = -1;
1003 return 0;
1004 }
1005 }
1006 ret = read_stat_pipe(&rfds);
1007 if (ret < 0) {
1008 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1009 close(stat_pipe);
1010 stat_pipe = -1;
1011 clear_all_items();
1012 free(stat_content[SI_BASENAME]);
1013 stat_content[SI_BASENAME] =
1014 para_strdup("stat command terminated!?");
1015 print_all_items();
1016 }
1017 check_return:
1018 switch (mode) {
1019 case COMMAND_MODE:
1020 ret = wgetch(top.win);
1021 if (ret != ERR && ret != KEY_RESIZE) {
1022 if (command_pipe) {
1023 close(command_pipe);
1024 command_pipe = -1;
1025 }
1026 if (cmd_pid)
1027 kill(cmd_pid, SIGTERM);
1028 return -1;
1029 }
1030 break;
1031 case GETCH_MODE:
1032 ret = wgetch(top.win);
1033 if (ret != ERR && ret != KEY_RESIZE)
1034 return ret;
1035 break;
1036 case EXTERNAL_MODE:
1037 if (cmd_died) {
1038 cmd_died = 0;
1039 return 0;
1040 }
1041 }
1042 goto repeat;
1043 }
1044
1045 /*
1046 * read from command pipe and print data to bot window
1047 */
1048 static int send_output(void)
1049 {
1050 int ret;
1051
1052 if (command_pipe < 0)
1053 return 0;
1054 ret = mark_fd_nonblocking(command_pipe);
1055 if (ret < 0) {
1056 close(command_pipe);
1057 return ret;
1058 }
1059 if (do_select(COMMAND_MODE) >= 0)
1060 PARA_INFO_LOG("command complete");
1061 else
1062 PARA_NOTICE_LOG("command aborted");
1063 print_in_bar(COLOR_MSG, " ");
1064 return 1;
1065 }
1066
1067 static int client_cmd_cmdline(char *cmd)
1068 {
1069 int ret, fds[3] = {0, 1, 0};
1070 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1071
1072 outputf(COLOR_COMMAND, "%s", c);
1073 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1074 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1075 free(c);
1076 if (ret < 0)
1077 return -1;
1078 command_pipe = fds[1];
1079 return send_output();
1080 }
1081
1082 /*
1083 * exec command and print output to bot win
1084 */
1085 static int display_cmd(char *cmd)
1086 {
1087 int fds[3] = {0, 1, 0};
1088
1089 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1090 outputf(COLOR_COMMAND, "%s", cmd);
1091 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1092 return -1;
1093 command_pipe = fds[1];
1094 return send_output();
1095 }
1096
1097 /*
1098 * shutdown curses and stat pipe before executing external commands
1099 */
1100 static int external_cmd(char *cmd)
1101 {
1102 int fds[3] = {-1, -1, -1};
1103
1104 if (cmd_pid)
1105 return -1;
1106 shutdown_curses();
1107 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1108 cmd_died = 0;
1109 do_select(EXTERNAL_MODE);
1110 init_curses();
1111 return 0;
1112 }
1113
1114 static void print_scroll_msg(void)
1115 {
1116 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1117 int first_rbe = first_visible_rbe(&lines_total);
1118 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1119 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1120 }
1121
1122 static void com_scroll_top(void)
1123 {
1124 int i = RINGBUFFER_SIZE - 1;
1125 unsigned lines = 0;
1126
1127 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1128 i--;
1129 /* i is oldest entry */
1130 for (; lines < bot.lines && i >= 0; i--) {
1131 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1132 if (!rbe)
1133 break;
1134 lines += NUM_LINES(strlen(rbe->msg));
1135 }
1136 i++;
1137 if (lines > 0 && scroll_position != i) {
1138 scroll_position = i;
1139 redraw_bot_win();
1140 print_scroll_msg();
1141 return;
1142 }
1143 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1144 }
1145
1146 static void com_cancel_scrolling(void)
1147 {
1148
1149 if (scroll_position == 0) {
1150 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1151 return;
1152 }
1153 scroll_position = 0;
1154 redraw_bot_win();
1155 }
1156
1157 static void com_page_down(void)
1158 {
1159 unsigned lines = 0;
1160 int i = scroll_position;
1161 while (lines < bot.lines && --i > 0) {
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 if (lines) {
1168 scroll_position = i;
1169 redraw_bot_win();
1170 print_scroll_msg();
1171 return;
1172 }
1173 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1174 }
1175
1176 static void com_page_up(void)
1177 {
1178 unsigned lines;
1179 int fvr = first_visible_rbe(&lines);
1180
1181 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1182 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1183 return;
1184 }
1185 scroll_position = fvr + 1;
1186 for (; scroll_position > 0; scroll_position--) {
1187 first_visible_rbe(&lines);
1188 if (lines == bot.lines)
1189 break;
1190 }
1191 redraw_bot_win();
1192 print_scroll_msg();
1193 }
1194
1195 static void com_scroll_down(void)
1196 {
1197 struct rb_entry *rbe;
1198 int rbe_lines;
1199
1200 if (!scroll_position) {
1201 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1202 return;
1203 }
1204 scroll_position--;
1205 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1206 rbe_lines = NUM_LINES(rbe->len);
1207 wscrl(bot.win, rbe_lines);
1208 wmove(bot.win, bot.lines - rbe_lines, 0);
1209 wattron(bot.win, COLOR_PAIR(rbe->color));
1210 waddstr(bot.win, rbe->msg);
1211 wrefresh(bot.win);
1212 print_scroll_msg();
1213 }
1214
1215 static void com_scroll_up(void)
1216 {
1217 struct rb_entry *rbe = NULL;
1218 unsigned lines;
1219 int i, first_rbe, num_scroll;
1220
1221 /* the entry that is going to vanish */
1222 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1223 if (!rbe)
1224 goto err_out;
1225 num_scroll = NUM_LINES(rbe->len);
1226 first_rbe = first_visible_rbe(&lines);
1227 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1228 goto err_out;
1229 scroll_position++;
1230 wscrl(bot.win, -num_scroll);
1231 i = draw_top_rbe(&lines);
1232 if (i < 0)
1233 goto err_out;
1234 while (i > 0 && lines < num_scroll) {
1235 int rbe_lines;
1236 rbe = ringbuffer_get(bot_win_rb, --i);
1237 if (!rbe)
1238 break;
1239 rbe_lines = NUM_LINES(rbe->len);
1240 lines += rbe_lines;
1241 // fprintf(stderr, "msg: %s\n", rbe->msg);
1242 wattron(bot.win, COLOR_PAIR(rbe->color));
1243 waddstr(bot.win, "\n");
1244 waddstr(bot.win, rbe->msg);
1245 if (!i)
1246 break;
1247 i--;
1248 }
1249 wrefresh(bot.win);
1250 print_scroll_msg();
1251 return;
1252 err_out:
1253 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1254 }
1255
1256 static void com_ll_decr(void)
1257 {
1258 if (loglevel <= LL_DEBUG) {
1259 print_in_bar(COLOR_ERRMSG,
1260 "loglevel already at maximal verbosity\n");
1261 return;
1262 }
1263 loglevel--;
1264 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1265 }
1266
1267 static void com_ll_incr(void)
1268 {
1269 if (loglevel >= LL_EMERG) {
1270 print_in_bar(COLOR_ERRMSG,
1271 "loglevel already at minimal verbosity\n");
1272 return;
1273 }
1274 loglevel++;
1275 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1276 }
1277
1278 /*
1279 * reread configuration, terminate on errors
1280 */
1281 static void com_reread_conf(void)
1282 {
1283 char *cf =configfile_exists();
1284 struct gui_cmdline_parser_params params = {
1285 .override = 1,
1286 .initialize = 1,
1287 .check_required = 0,
1288 .check_ambiguity = 0,
1289 .print_errors = 0,
1290 };
1291
1292 if (!cf) {
1293 PARA_WARNING_LOG("there is no configuration to read");
1294 return;
1295 }
1296 PARA_INFO_LOG("rereading command line options and config file");
1297 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1298 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1299 PARA_EMERG_LOG("errors in config file");
1300 finish(EXIT_FAILURE);
1301 }
1302 PARA_NOTICE_LOG("config file reloaded");
1303 if (check_key_map_args() < 0)
1304 finish(EXIT_FAILURE);
1305 }
1306
1307 static void com_help(void)
1308 {
1309 int i;
1310
1311 for (i = 0; i < conf.key_map_given; ++i) {
1312 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1313 const char *handler_text = "???", *desc = NULL;
1314
1315 if (!split_key_map(tmp, &handler, &arg)) {
1316 free(tmp);
1317 return;
1318 }
1319 switch (*handler) {
1320 case 'i':
1321 handler_text = "internal";
1322 desc = command_list[find_cmd_byname(arg)].description;
1323 break;
1324 case 'x': handler_text = "external"; break;
1325 case 'd': handler_text = "display "; break;
1326 case 'p': handler_text = "para "; break;
1327 }
1328 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1329 strlen(arg) < 8? "\t" : "",
1330 desc? desc : "");
1331 free(tmp);
1332 }
1333 for (i = 0; command_list[i].handler; i++) {
1334 struct gui_command gc = command_list[i];
1335
1336 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1337 strlen(gc.name) < 8? "\t" : "",
1338 gc.description);
1339 }
1340 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1341 "for more info");
1342 }
1343
1344 static void com_shrink_top_win(void)
1345 {
1346 if (top.lines <= theme.top_lines_min) {
1347 PARA_WARNING_LOG("can not decrease top window");
1348 return;
1349 }
1350 init_wins(top.lines - 1);
1351 wclear(top.win);
1352 print_all_items();
1353 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1354 }
1355
1356 static void com_enlarge_top_win(void)
1357 {
1358 if (bot.lines < 3) {
1359 PARA_WARNING_LOG("can not increase top window");
1360 return;
1361 }
1362 init_wins(top.lines + 1);
1363 wclear(top.win);
1364 print_all_items();
1365 print_in_bar(COLOR_MSG, "increased top window");
1366 }
1367
1368 static void com_version(void)
1369 {
1370 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1371 CODENAME "\"");
1372 }
1373
1374 __noreturn static void com_quit(void)
1375 {
1376 finish(0);
1377 }
1378
1379 static void com_refresh(void)
1380 {
1381 shutdown_curses();
1382 init_curses();
1383 }
1384
1385 static void change_theme(int next)
1386 {
1387 if (next)
1388 next_theme(&theme);
1389 else
1390 prev_theme(&theme);
1391 /* This seems to be needed twice, why? */
1392 com_refresh();
1393 com_refresh();
1394 PARA_NOTICE_LOG("new theme: %s", theme.name);
1395 }
1396
1397 static void com_next_theme(void)
1398 {
1399 change_theme(1);
1400 }
1401
1402 static void com_prev_theme(void)
1403 {
1404 change_theme(0);
1405 }
1406
1407
1408 static void handle_command(int c)
1409 {
1410 int i;
1411
1412 /* first check user's key bindings */
1413 for (i = 0; i < conf.key_map_given; ++i) {
1414 char *tmp, *handler, *arg;
1415
1416 tmp = para_strdup(conf.key_map_arg[i]);
1417 if (!split_key_map(tmp, &handler, &arg)) {
1418 free(tmp);
1419 return;
1420 }
1421 if (strcmp(tmp, km_keyname(c))) {
1422 free(tmp);
1423 continue;
1424 }
1425 if (*handler == 'd')
1426 display_cmd(arg);
1427 else if (*handler == 'x')
1428 external_cmd(arg);
1429 else if (*handler == 'p')
1430 client_cmd_cmdline(arg);
1431 else if (*handler == 'i') {
1432 int num = find_cmd_byname(arg);
1433 if (num >= 0)
1434 command_list[num].handler();
1435 }
1436 free(tmp);
1437 return;
1438 }
1439 /* not found, check internal key bindings */
1440 for (i = 0; command_list[i].handler; i++) {
1441 if (!strcmp(km_keyname(c), command_list[i].key)) {
1442 command_list[i].handler();
1443 return;
1444 }
1445 }
1446 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1447 km_keyname(c));
1448 }
1449
1450 int main(int argc, char *argv[])
1451 {
1452 int ret;
1453 char *cf;
1454
1455 _argc = argc;
1456 _argv = argv;
1457
1458 if (gui_cmdline_parser(argc, argv, &conf) != 0)
1459 exit(EXIT_FAILURE);
1460 HANDLE_VERSION_FLAG("gui", conf);
1461 cf = configfile_exists();
1462 if (!cf && conf.config_file_given) {
1463 fprintf(stderr, "can not read config file %s\n",
1464 conf.config_file_arg);
1465 exit(EXIT_FAILURE);
1466 }
1467 if (cf) {
1468 struct gui_cmdline_parser_params params = {
1469 .override = 0,
1470 .initialize = 0,
1471 .check_required = 0,
1472 .check_ambiguity = 0,
1473 .print_errors = 1,
1474 };
1475 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1476 exit(EXIT_FAILURE);
1477 }
1478 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1479 if (check_key_map_args() < 0) {
1480 fprintf(stderr, "invalid key map\n");
1481 exit(EXIT_FAILURE);
1482 }
1483 init_theme_or_die(conf.theme_arg, &theme);
1484 top.lines = theme.top_lines_default;
1485 setup_signal_handling();
1486 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1487 initscr(); /* needed only once, always successful */
1488 init_curses();
1489 print_welcome();
1490 for (;;) {
1491 print_status_bar();
1492 ret = do_select(GETCH_MODE);
1493 if (!ret)
1494 continue;
1495 print_in_bar(COLOR_MSG, " ");
1496 handle_command(ret);
1497 }
1498 }