gui: Simplify print_status_bar().
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2014 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6
7 /** \file gui.c Curses-based interface for paraslash. */
8
9 #include <regex.h>
10 #include <signal.h>
11 #include <sys/types.h>
12 #include <curses.h>
13 #include <locale.h>
14 #include <sys/time.h>
15
16 #include "gui.cmdline.h"
17 #include "para.h"
18 #include "gui.h"
19 #include "string.h"
20 #include "ringbuffer.h"
21 #include "fd.h"
22 #include "error.h"
23 #include "list.h"
24 #include "sched.h"
25 #include "signal.h"
26 #include "ggo.h"
27 #include "version.h"
28
29 /** define the array of error lists needed by para_gui */
30 INIT_GUI_ERRLISTS;
31 static char *stat_content[NUM_STAT_ITEMS];
32
33 static int signal_pipe;
34
35 static struct gui_window {
36 WINDOW *win;
37 size_t begx;
38 size_t begy;
39 size_t cols;
40 size_t lines;
41 } top, bot, sb, in, sep;
42
43 #define RINGBUFFER_SIZE 512
44 struct rb_entry {
45 char *msg;
46 size_t len;
47 int color;
48 };
49 static struct ringbuffer *bot_win_rb;
50 #define NUM_LINES(len) (1 + (len) / bot.cols)
51
52 static unsigned scroll_position;
53
54 static bool curses_active;
55 static pid_t cmd_pid;
56
57 static int command_fds[2] = {-1, -1};
58 static int stat_pipe = -1;
59 static struct gui_args_info conf;
60
61 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
62
63
64 /**
65 * Codes for various colors.
66 *
67 * Each status item has its own color pair. The ones defined here start at a
68 * higher number so that they do not overlap with these.
69 */
70 enum gui_color_pair {
71 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
72 COLOR_COMMAND,
73 COLOR_OUTPUT,
74 COLOR_MSG,
75 COLOR_ERRMSG,
76 COLOR_WELCOME,
77 COLOR_SEPARATOR,
78 COLOR_TOP,
79 COLOR_BOT,
80 };
81
82 struct gui_command {
83 const char *key;
84 const char *name;
85 const char *description;
86 void (*handler)(void);
87 };
88
89 static struct gui_theme theme;
90
91 static int _argc;
92 static char **_argv;
93
94 static void com_help(void);
95 static void com_reread_conf(void);
96 static void com_enlarge_top_win(void);
97 static void com_shrink_top_win(void);
98 static void com_version(void);
99 __noreturn static void com_quit(void);
100 static void com_refresh(void);
101 static void com_ll_incr(void);
102 static void com_ll_decr(void);
103 static void com_prev_theme(void);
104 static void com_next_theme(void);
105 static void com_scroll_up(void);
106 static void com_scroll_down(void);
107 static void com_page_up(void);
108 static void com_page_down(void);
109 static void com_cancel_scrolling(void);
110 static void com_scroll_top(void);
111
112 static struct gui_command command_list[] = {
113 {
114 .key = "?",
115 .name = "help",
116 .description = "print help",
117 .handler = com_help
118 }, {
119 .key = "+",
120 .name = "enlarge_win",
121 .description = "enlarge the top window",
122 .handler = com_enlarge_top_win
123 }, {
124 .key = "-",
125 .name = "shrink_win",
126 .description = "shrink the top window",
127 .handler = com_shrink_top_win
128 }, {
129 .key = "r",
130 .name = "reread_conf",
131 .description = "reread configuration file",
132 .handler = com_reread_conf
133 }, {
134 .key = "q",
135 .name = "quit",
136 .description = "exit para_gui",
137 .handler = com_quit
138 }, {
139 .key = "^L",
140 .name = "refresh",
141 .description = "redraw the screen",
142 .handler = com_refresh
143 }, {
144 .key = ".",
145 .name = "next_theme",
146 .description = "switch to next theme",
147 .handler = com_next_theme
148 }, {
149 .key = ",",
150 .name = "prev_theme",
151 .description = "switch to previous stream",
152 .handler = com_prev_theme
153 }, {
154 .key = ">",
155 .name = "ll_incr",
156 .description = "increase loglevel (decreases verbosity)",
157 .handler = com_ll_incr
158 }, {
159 .key = "<",
160 .name = "ll_decr",
161 .description = "decrease loglevel (increases verbosity)",
162 .handler = com_ll_decr
163 }, {
164 .key = "V",
165 .name = "version",
166 .description = "show the para_gui version",
167 .handler = com_version
168 }, {
169 .key = "<up>",
170 .name = "scroll_up",
171 .description = "scroll up one line",
172 .handler = com_scroll_up
173 }, {
174 .key = "<down>",
175 .name = "scroll_down",
176 .description = "scroll down one line",
177 .handler = com_scroll_down
178 }, {
179 .key = "<ppage>",
180 .name = "page_up",
181 .description = "scroll up one page",
182 .handler = com_page_up
183 }, {
184 .key = "<npage>",
185 .name = "page_down",
186 .description = "scroll down one page",
187 .handler = com_page_down
188 }, {
189 .key = "<home>",
190 .name = "scroll_top",
191 .description = "scroll to top of buffer",
192 .handler = com_scroll_top
193 }, {
194 .key = "<end>",
195 .name = "cancel_scroll",
196 .description = "deactivate scroll mode",
197 .handler = com_cancel_scrolling
198 }, {
199 .handler = NULL
200 }
201 };
202
203 static int find_cmd_byname(char *name)
204 {
205 int i;
206
207 for (i = 0; command_list[i].handler; i++)
208 if (!strcmp(command_list[i].name, name))
209 return i;
210 return -1;
211 }
212
213 /* taken from mutt */
214 static char *km_keyname(int c)
215 {
216 static char buf[10];
217
218 if (c == KEY_UP) {
219 sprintf(buf, "<up>");
220 return buf;
221 }
222 if (c == KEY_DOWN) {
223 sprintf(buf, "<down>");
224 return buf;
225 }
226 if (c == KEY_LEFT) {
227 sprintf(buf, "<left>");
228 return buf;
229 }
230 if (c == KEY_RIGHT) {
231 sprintf(buf, "<right>");
232 return buf;
233 }
234 if (c == KEY_NPAGE) {
235 sprintf(buf, "<npage>");
236 return buf;
237 }
238 if (c == KEY_PPAGE) {
239 sprintf(buf, "<ppage>");
240 return buf;
241 }
242 if (c == KEY_HOME) {
243 sprintf(buf, "<home>");
244 return buf;
245 }
246 if (c == KEY_END) {
247 sprintf(buf, "<end>");
248 return buf;
249 }
250 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
251 if (c < 0)
252 c += 256;
253 if (c < 128) {
254 buf[0] = '^';
255 buf[1] = (c + '@') & 0x7f;
256 buf[2] = 0;
257 } else
258 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
259 (c >> 3) & 7, c & 7);
260 } else if (c >= KEY_F0 && c < KEY_F(256))
261 sprintf(buf, "<F%d>", c - KEY_F0);
262 else if (isprint(c))
263 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
264 else
265 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
266 return buf;
267 }
268
269 static char *configfile_exists(void)
270 {
271 static char *config_file;
272 char *tmp;
273
274 if (!conf.config_file_given) {
275 if (!config_file) {
276 char *home = para_homedir();
277 config_file = make_message("%s/.paraslash/gui.conf",
278 home);
279 free(home);
280 }
281 tmp = config_file;
282 } else
283 tmp = conf.config_file_arg;
284 return file_exists(tmp)? tmp: NULL;
285 }
286
287 /* Print given number of spaces to curses window. */
288 static void add_spaces(WINDOW* win, unsigned int num)
289 {
290 char space[] = " ";
291 unsigned sz = sizeof(space) - 1; /* number of spaces */
292
293 while (num >= sz) {
294 waddstr(win, space);
295 num -= sz;
296 }
297 if (num > 0) {
298 assert(num < sz);
299 space[num] = '\0';
300 waddstr(win, space);
301 }
302 }
303
304 /*
305 * print aligned string to curses window. This function always prints
306 * exactly len chars.
307 */
308 static int align_str(WINDOW* win, char *str, unsigned int len,
309 unsigned int align)
310 {
311 int ret, i, num; /* of spaces */
312 size_t width;
313
314 if (!win || !str)
315 return 0;
316 ret = strwidth(str, &width);
317 if (ret < 0) {
318 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
319 width = 0;
320 str[0] = '\0';
321 }
322 num = len - width;
323 if (num < 0) {
324 str[len] = '\0';
325 num = 0;
326 }
327 /* replace control characters by spaces */
328 for (i = 0; i < len && str[i]; i++) {
329 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
330 str[i] = ' ';
331 }
332 if (align == LEFT) {
333 waddstr(win, str);
334 add_spaces(win, num);
335 } else if (align == RIGHT) {
336 add_spaces(win, num);
337 waddstr(win, str);
338 } else {
339 add_spaces(win, num / 2);
340 waddstr(win, str[0]? str: "");
341 add_spaces(win, num - num / 2);
342 }
343 return 1;
344 }
345
346 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
347 {
348 char *msg;
349 va_list ap;
350
351 if (!curses_active)
352 return;
353 wattron(in.win, COLOR_PAIR(color));
354 va_start(ap, fmt);
355 xvasprintf(&msg, fmt, ap);
356 va_end(ap);
357 wmove(in.win, 0, 0);
358 align_str(in.win, msg, in.cols, LEFT);
359 free(msg);
360 wrefresh(in.win);
361 }
362
363 static void print_status_bar(void)
364 {
365 char *tmp;
366
367 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
368 wmove(sb.win, 0, 0);
369 align_str(sb.win, tmp, sb.cols, CENTER);
370 free(tmp);
371 }
372
373 /*
374 * get the number of the oldest rbe that is (partially) visible. On return,
375 * lines contains the sum of the number of lines of all visible entries. If the
376 * first one is only partially visible, lines is greater than bot.lines.
377 */
378 static int first_visible_rbe(unsigned *lines)
379 {
380 int i;
381 *lines = 0;
382 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
383 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
384 int rbe_lines;
385 if (!rbe)
386 return i - 1;
387 // fprintf(stderr, "found: %s\n", rbe->msg);
388 rbe_lines = NUM_LINES(rbe->len);
389 if (rbe_lines > bot.lines)
390 return -1;
391 *lines += rbe_lines;
392 if (*lines >= bot.lines)
393 return i;
394 }
395 return RINGBUFFER_SIZE - 1;
396 }
397
398 /*
399 returns number of first visible rbe, *lines is the number of lines drawn.
400 */
401 static int draw_top_rbe(unsigned *lines)
402 {
403 int ret, fvr = first_visible_rbe(lines);
404 struct rb_entry *rbe;
405 size_t bytes_to_skip, cells_to_skip, width;
406
407 if (fvr < 0)
408 return -1;
409 wmove(bot.win, 0, 0);
410 rbe = ringbuffer_get(bot_win_rb, fvr);
411 if (!rbe)
412 return -1;
413 if (*lines > bot.lines) {
414 /* rbe is partially visible multi-line */
415 cells_to_skip = (*lines - bot.lines) * bot.cols;
416 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
417 if (ret < 0)
418 return ret;
419 ret = strwidth(rbe->msg + bytes_to_skip, &width);
420 if (ret < 0)
421 return ret;
422 } else {
423 bytes_to_skip = 0;
424 width = rbe->len;
425 }
426 wattron(bot.win, COLOR_PAIR(rbe->color));
427 waddstr(bot.win, rbe->msg + bytes_to_skip);
428 *lines = NUM_LINES(width);
429 return fvr;
430 }
431
432 static void redraw_bot_win(void)
433 {
434 unsigned lines;
435 int i;
436
437 wmove(bot.win, 0, 0);
438 wclear(bot.win);
439 i = draw_top_rbe(&lines);
440 if (i <= 0)
441 goto out;
442 while (i > 0 && lines < bot.lines) {
443 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
444 if (!rbe) {
445 lines++;
446 waddstr(bot.win, "\n");
447 continue;
448 }
449 lines += NUM_LINES(rbe->len);
450 wattron(bot.win, COLOR_PAIR(rbe->color));
451 waddstr(bot.win, "\n");
452 waddstr(bot.win, rbe->msg);
453 }
454 out:
455 wrefresh(bot.win);
456 }
457
458 static void rb_add_entry(int color, char *msg)
459 {
460 struct rb_entry *old, *new;
461 int x, y;
462 size_t len;
463
464 if (strwidth(msg, &len) < 0)
465 return;
466 new = para_malloc(sizeof(struct rb_entry));
467 new->color = color;
468 new->len = len;
469 new->msg = msg;
470 old = ringbuffer_add(bot_win_rb, new);
471 // fprintf(stderr, "added: %s\n", new->msg);
472 if (old) {
473 free(old->msg);
474 free(old);
475 }
476 if (scroll_position) {
477 /* discard current scrolling, like xterm does */
478 scroll_position = 0;
479 redraw_bot_win();
480 return;
481 }
482 wattron(bot.win, COLOR_PAIR(color));
483 getyx(bot.win, y, x);
484 if (y || x)
485 waddstr(bot.win, "\n");
486 waddstr(bot.win, msg);
487 }
488
489 /*
490 * print formated output to bot win and refresh
491 */
492 __printf_2_3 static void outputf(int color, const char* fmt,...)
493 {
494 char *msg;
495 va_list ap;
496
497 if (!curses_active)
498 return;
499 va_start(ap, fmt);
500 xvasprintf(&msg, fmt, ap);
501 va_end(ap);
502 rb_add_entry(color, msg);
503 wrefresh(bot.win);
504 }
505
506 static int add_output_line(char *line, void *data)
507 {
508 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
509
510 if (!curses_active)
511 return 1;
512 rb_add_entry(color, para_strdup(line));
513 return 1;
514 }
515
516 static int loglevel;
517
518 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
519 {
520 int color;
521 char *msg;
522 va_list ap;
523
524 if (ll < loglevel || !curses_active)
525 return;
526 switch (ll) {
527 case LL_DEBUG:
528 case LL_INFO:
529 case LL_NOTICE:
530 color = COLOR_MSG;
531 break;
532 default:
533 color = COLOR_ERRMSG;
534 }
535 va_start(ap, fmt);
536 xvasprintf(&msg, fmt, ap);
537 va_end(ap);
538 chop(msg);
539 rb_add_entry(color, msg);
540 wrefresh(bot.win);
541 }
542 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
543
544 static void setup_signal_handling(void)
545 {
546 signal_pipe = para_signal_init();
547 para_install_sighandler(SIGINT);
548 para_install_sighandler(SIGTERM);
549 para_install_sighandler(SIGCHLD);
550 para_install_sighandler(SIGWINCH);
551 para_install_sighandler(SIGUSR1);
552 }
553
554 /* kill every process in the process group and exit */
555 __noreturn static void kill_pg_and_die(int ret)
556 {
557 para_sigaction(SIGTERM, SIG_IGN);
558 kill(0, SIGTERM);
559 exit(ret);
560 }
561
562 static void shutdown_curses(void)
563 {
564 if (!curses_active)
565 return;
566 def_prog_mode();
567 curses_active = false;
568 endwin();
569 }
570
571 __noreturn static void finish(int ret)
572 {
573 shutdown_curses();
574 kill_pg_and_die(ret);
575 }
576
577 /*
578 * exit curses and print given message to stdout/stderr
579 */
580 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
581 {
582 va_list argp;
583 FILE *outfd = ret? stderr: stdout;
584
585 shutdown_curses();
586 va_start(argp, fmt);
587 vfprintf(outfd, fmt, argp);
588 va_end(argp);
589 kill_pg_and_die(ret);
590 }
591
592 static void print_welcome(void)
593 {
594 if (loglevel > LL_NOTICE)
595 return;
596 outputf(COLOR_WELCOME, "Welcome to %s. Theme: %s",
597 version_single_line("gui"), theme.name);
598 wclrtoeol(bot.win);
599 }
600
601 /*
602 * init all windows
603 */
604 static void init_wins(int top_lines)
605 {
606 int i;
607
608 top.lines = top_lines;
609 top.cols = COLS;
610 top.begy = 0;
611 top.begx = 0;
612
613 bot.lines = LINES - top.lines - 3;
614 bot.cols = COLS;
615 bot.begy = top.lines + 1;
616 bot.begx = 0;
617
618 sb.lines = 1;
619 sb.cols = COLS;
620 sb.begy = LINES - 2;
621 sb.begx = 0;
622
623 in.lines = 1;
624 in.cols = COLS;
625 in.begy = LINES - 1;
626 in.begx = 0;
627
628 sep.lines = 1;
629 sep.cols = COLS;
630 sep.begy = top.lines;
631 sep.begx = 0;
632
633 assume_default_colors(theme.default_fg, theme.default_bg);
634 if (top.win) {
635 mvwin(top.win, top.begy, top.begx);
636 wresize(top.win, top.lines, top.cols);
637
638 mvwin(sb.win, sb.begy, sb.begx);
639 wresize(sb.win, sb.lines, sb.cols);
640
641 mvwin(sep.win, sep.begy, sep.begx);
642 wresize(sep.win, sep.lines, sep.cols);
643
644 mvwin(bot.win, bot.begy, bot.begx);
645 wresize(bot.win, bot.lines, bot.cols);
646
647 mvwin(in.win, in.begy, in.begx);
648 wresize(in.win, in.lines, in.cols);
649 } else {
650 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
651 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
652 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
653 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
654 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
655 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
656 msg_n_exit(1, "Error: Cannot create curses windows\n");
657 wclear(bot.win);
658 wclear(sb.win);
659 wclear(in.win);
660 scrollok(bot.win, 1);
661 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
662 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
663 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
664 wattron(top.win, COLOR_PAIR(COLOR_TOP));
665 nodelay(top.win, 1);
666 nodelay(bot.win, 1);
667 nodelay(sb.win, 1);
668 nodelay(in.win, 0);
669
670 keypad(top.win, 1);
671 keypad(bot.win, 1);
672 keypad(sb.win, 1);
673 keypad(in.win, 1);
674 }
675 wmove(sep.win, 0, 0);
676 for (i = 1; i <= COLS; i++)
677 waddstr(sep.win, theme.sep_str);
678 wclear(top.win);
679 //wclear(bot.win);
680 wnoutrefresh(top.win);
681 wnoutrefresh(bot.win);
682 print_status_bar();
683 wnoutrefresh(sb.win);
684 wnoutrefresh(in.win);
685 wnoutrefresh(sep.win);
686 doupdate();
687 }
688
689 /*
690 * Print stat item #i to curses window
691 */
692 static void print_stat_item(int i)
693 {
694 char *tmp;
695 struct stat_item_data d = theme.data[i];
696 char *c = stat_content[i];
697
698 if (!curses_active || !d.len || !c)
699 return;
700 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
701 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
702 wrefresh(top.win);
703 wattron(top.win, COLOR_PAIR(i + 1));
704 align_str(top.win, tmp, d.len * COLS / 100, d.align);
705 free(tmp);
706 wrefresh(top.win);
707 }
708
709 static int update_item(int item_num, char *buf)
710 {
711 char **c = stat_content + item_num;
712
713 free(*c);
714 if (buf && buf[0])
715 goto dup;
716 switch (item_num) {
717 case SI_ARTIST:
718 *c = para_strdup("(artist tag not set)");
719 goto print;
720 case SI_TITLE:
721 *c = para_strdup("(title tag not set)");
722 goto print;
723 case SI_YEAR:
724 *c = para_strdup("????");
725 goto print;
726 case SI_ALBUM:
727 *c = para_strdup("(album tag not set)");
728 goto print;
729 case SI_COMMENT:
730 *c = para_strdup("(comment tag not set)");
731 goto print;
732 }
733 dup:
734 *c = para_strdup(buf);
735 print:
736 print_stat_item(item_num);
737 return 1;
738 }
739
740 static int read_stat_pipe(fd_set *rfds)
741 {
742 static char *buf;
743 static int bufsize, loaded;
744 int ret, ret2;
745 size_t sz;
746
747 if (stat_pipe < 0)
748 return 0;
749 if (loaded >= bufsize) {
750 if (bufsize > 1000 * 1000) {
751 loaded = 0;
752 return 0;
753 }
754 bufsize += bufsize + 1000;
755 buf = para_realloc(buf, bufsize);
756 }
757 assert(loaded < bufsize);
758 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
759 rfds, &sz);
760 loaded += sz;
761 ret2 = for_each_stat_item(buf, loaded, update_item);
762 if (ret < 0 || ret2 < 0) {
763 loaded = 0;
764 return ret2 < 0? ret2 : ret;
765 }
766 sz = ret2; /* what is left */
767 if (sz > 0 && sz < loaded)
768 memmove(buf, buf + loaded - sz, sz);
769 loaded = sz;
770 return 1;
771 }
772
773 static void print_all_items(void)
774 {
775 int i;
776
777 if (!curses_active)
778 return;
779 FOR_EACH_STATUS_ITEM(i)
780 print_stat_item(i);
781 }
782
783 static void clear_all_items(void)
784 {
785 int i;
786
787 FOR_EACH_STATUS_ITEM(i) {
788 free(stat_content[i]);
789 stat_content[i] = para_strdup("");
790 }
791 }
792
793 static void init_pair_or_die(short pair, short f, short b)
794 {
795 if (init_pair(pair, f, b) == ERR)
796 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
797 }
798
799 static void init_colors_or_die(void)
800 {
801 int i;
802
803 if (!has_colors())
804 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
805 if (start_color() == ERR)
806 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
807 FOR_EACH_STATUS_ITEM(i)
808 if (theme.data[i].len)
809 init_pair_or_die(i + 1, theme.data[i].fg,
810 theme.data[i].bg);
811 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
812 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
813 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
814 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
815 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
816 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
817 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
818 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
819 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
820 }
821
822 /* (Re-)initialize the curses library. */
823 static void init_curses(void)
824 {
825 curses_active = true;
826 if (top.win && refresh() == ERR) /* refresh is really needed */
827 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
828 if (LINES < theme.lines_min || COLS < theme.cols_min)
829 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
830 " (need at least %dx%d)\n", COLS, LINES,
831 theme.cols_min, theme.lines_min);
832 curs_set(0); /* make cursor invisible, ignore errors */
833 nonl(); /* do not NL->CR/NL on output, always returns OK */
834 /* don't echo input */
835 if (noecho() == ERR)
836 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
837 /* take input chars one at a time, no wait for \n */
838 if (cbreak() == ERR)
839 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
840 init_colors_or_die();
841 clear(); /* ignore non-fatal errors */
842 init_wins(theme.top_lines_default);
843 print_all_items();
844 // noecho(); /* don't echo input */
845 }
846
847 static void check_sigchld(void)
848 {
849 int ret;
850 pid_t pid;
851
852 reap_next_child:
853 ret = para_reap_child(&pid);
854 if (ret <= 0)
855 return;
856 if (pid == cmd_pid)
857 cmd_pid = 0;
858 goto reap_next_child;
859 }
860
861 /*
862 * This sucker modifies its first argument. *handler and *arg are
863 * pointers to 0-terminated strings (inside line). Crap.
864 */
865 static int split_key_map(char *line, char **handler, char **arg)
866 {
867 if (!(*handler = strchr(line + 1, ':')))
868 goto err_out;
869 **handler = '\0';
870 (*handler)++;
871 if (!(*arg = strchr(*handler, ':')))
872 goto err_out;
873 **arg = '\0';
874 (*arg)++;
875 return 1;
876 err_out:
877 return 0;
878 }
879
880 static int check_key_map_args(void)
881 {
882 char *s;
883 int i, ret = -1;
884 char *tmp = NULL, *handler, *arg;
885
886 for (i = 0; i < conf.key_map_given; ++i) {
887 s = conf.key_map_arg[i];
888 if (!(*s))
889 goto out;
890 free(tmp);
891 tmp = para_strdup(s);
892 if (!split_key_map(tmp, &handler, &arg))
893 goto out;
894 if (strlen(handler) != 1)
895 goto out;
896 if (*handler != 'x'
897 && *handler != 'd'
898 && *handler != 'i'
899 && *handler != 'p')
900 goto out;
901 if (*handler != 'i')
902 continue;
903 if (find_cmd_byname(arg) < 0)
904 goto out;
905 }
906 ret = 0;
907 out:
908 free(tmp);
909 return ret;
910 }
911
912 /*
913 * React to various signal-related events
914 */
915 static void handle_signal(int sig)
916 {
917 switch (sig) {
918 case SIGTERM:
919 msg_n_exit(EXIT_FAILURE,
920 "only the good die young (caught SIGTERM))\n");
921 return;
922 case SIGWINCH:
923 if (curses_active) {
924 shutdown_curses();
925 init_curses();
926 redraw_bot_win();
927 }
928 return;
929 case SIGINT:
930 PARA_WARNING_LOG("caught SIGINT, reset\n");
931 /* Nothing to do. SIGINT killed our child which gets noticed
932 * by do_select and resets everything.
933 */
934 return;
935 case SIGUSR1:
936 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
937 com_reread_conf();
938 return;
939 case SIGCHLD:
940 check_sigchld();
941 return;
942 }
943 }
944
945 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
946 {
947 static struct timeval next_exec, atm, diff;
948 int ret, fds[3] = {0, 1, 0};
949 pid_t pid;
950
951 if (stat_pipe >= 0)
952 goto success;
953 /* Avoid busy loop */
954 gettimeofday(&atm, NULL);
955 if (tv_diff(&next_exec, &atm, &diff) > 0) {
956 if (tv_diff(&diff, tv, NULL) < 0)
957 *tv = diff;
958 return;
959 }
960 next_exec.tv_sec = atm.tv_sec + 2;
961 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
962 if (ret < 0)
963 return;
964 ret = mark_fd_nonblocking(fds[1]);
965 if (ret < 0) {
966 close(fds[1]);
967 return;
968 }
969 stat_pipe = fds[1];
970 success:
971 para_fd_set(stat_pipe, rfds, max_fileno);
972 }
973
974 #define COMMAND_BUF_SIZE 32768
975
976 /*
977 * This is the core select loop. Besides the (internal) signal
978 * pipe, the following other fds are checked according to the mode:
979 *
980 * GETCH_MODE: check stdin, return when key is pressed
981 *
982 * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
983 * stdout and stderr or when any key is pressed.
984 *
985 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
986 * is running. During that time curses is disabled. Returns when
987 * cmd_pid == 0.
988 */
989 static int do_select(int mode)
990 {
991 fd_set rfds;
992 int ret, i, max_fileno;
993 char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
994 int cbo[2] = {0, 0}; /* command buf offsets */
995 struct timeval tv;
996 unsigned flags[2] = {0, 0}; /* for for_each_line() */
997
998 repeat:
999 tv.tv_sec = conf.timeout_arg / 1000;
1000 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
1001 // ret = refresh_status();
1002 FD_ZERO(&rfds);
1003 max_fileno = 0;
1004 status_pre_select(&rfds, &max_fileno, &tv);
1005 /* signal pipe */
1006 para_fd_set(signal_pipe, &rfds, &max_fileno);
1007 /* command pipe only for COMMAND_MODE */
1008 if (mode == COMMAND_MODE) {
1009 if (command_fds[0] >= 0)
1010 para_fd_set(command_fds[0], &rfds, &max_fileno);
1011 if (command_fds[1] >= 0)
1012 para_fd_set(command_fds[1], &rfds, &max_fileno);
1013 }
1014 if (mode == GETCH_MODE || mode == COMMAND_MODE)
1015 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1016 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1017 if (ret <= 0)
1018 goto check_return; /* skip fd checks */
1019 /* signals */
1020 ret = para_next_signal(&rfds);
1021 if (ret > 0)
1022 handle_signal(ret);
1023 /* read command pipe if ready */
1024 if (mode == COMMAND_MODE) {
1025 for (i = 0; i < 2; i++) {
1026 size_t sz;
1027 if (command_fds[i] < 0)
1028 continue;
1029 ret = read_nonblock(command_fds[i],
1030 command_buf[i] + cbo[i],
1031 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1032 cbo[i] += sz;
1033 sz = cbo[i];
1034 cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1035 add_output_line, &i);
1036 if (sz != cbo[i]) { /* at least one line found */
1037 wrefresh(bot.win);
1038 flags[i] = 0;
1039 }
1040 if (ret < 0) {
1041 PARA_NOTICE_LOG("closing command fd %d: %s\n",
1042 i, para_strerror(-ret));
1043 close(command_fds[i]);
1044 command_fds[i] = -1;
1045 flags[i] = 0;
1046 cbo[i] = 0;
1047 if (command_fds[!i] < 0) /* both fds closed */
1048 return 0;
1049 }
1050 if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1051 PARA_NOTICE_LOG("discarding overlong line\n");
1052 cbo[i] = 0;
1053 flags[i] = FELF_DISCARD_FIRST;
1054 }
1055 }
1056 }
1057 ret = read_stat_pipe(&rfds);
1058 if (ret < 0) {
1059 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1060 close(stat_pipe);
1061 stat_pipe = -1;
1062 clear_all_items();
1063 free(stat_content[SI_BASENAME]);
1064 stat_content[SI_BASENAME] =
1065 para_strdup("stat command terminated!?");
1066 print_all_items();
1067 }
1068 check_return:
1069 switch (mode) {
1070 case COMMAND_MODE:
1071 ret = wgetch(top.win);
1072 if (ret != ERR && ret != KEY_RESIZE) {
1073 if (cmd_pid)
1074 kill(cmd_pid, SIGTERM);
1075 return -1;
1076 }
1077 break;
1078 case GETCH_MODE:
1079 ret = wgetch(top.win);
1080 if (ret != ERR && ret != KEY_RESIZE)
1081 return ret;
1082 break;
1083 case EXTERNAL_MODE:
1084 if (cmd_pid == 0)
1085 return 0;
1086 }
1087 goto repeat;
1088 }
1089
1090 /* read from command pipe and print data to bot window */
1091 static void exec_and_display_cmd(const char *cmd)
1092 {
1093 int ret, fds[3] = {0, 1, 1};
1094
1095 outputf(COLOR_COMMAND, "%s", cmd);
1096 ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1097 if (ret < 0)
1098 return;
1099 ret = mark_fd_nonblocking(fds[1]);
1100 if (ret < 0)
1101 goto fail;
1102 ret = mark_fd_nonblocking(fds[2]);
1103 if (ret < 0)
1104 goto fail;
1105 command_fds[0] = fds[1];
1106 command_fds[1] = fds[2];
1107 if (do_select(COMMAND_MODE) >= 0)
1108 PARA_INFO_LOG("command complete\n");
1109 else
1110 PARA_NOTICE_LOG("command aborted\n");
1111 print_in_bar(COLOR_MSG, " ");
1112 return;
1113 fail:
1114 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1115 close(command_fds[0]);
1116 close(command_fds[1]);
1117 }
1118
1119 static void para_cmd(char *cmd)
1120 {
1121 char *c;
1122
1123 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1124 c = make_message(BINDIR "/para_client -- %s", cmd);
1125 exec_and_display_cmd(c);
1126 free(c);
1127 }
1128
1129 static void display_cmd(char *cmd)
1130 {
1131 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1132 exec_and_display_cmd(cmd);
1133 }
1134
1135 /*
1136 * shutdown curses and stat pipe before executing external commands
1137 */
1138 static void external_cmd(char *cmd)
1139 {
1140 int fds[3] = {-1, -1, -1};
1141
1142 if (cmd_pid)
1143 return;
1144 shutdown_curses();
1145 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1146 return;
1147 do_select(EXTERNAL_MODE);
1148 init_curses();
1149 }
1150
1151 static void print_scroll_msg(void)
1152 {
1153 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1154 int first_rbe = first_visible_rbe(&lines_total);
1155
1156 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1157 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1158 }
1159
1160 static void com_scroll_top(void)
1161 {
1162 int i = RINGBUFFER_SIZE - 1;
1163 unsigned lines = 0;
1164
1165 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1166 i--;
1167 /* i is oldest entry */
1168 for (; lines < bot.lines && i >= 0; i--) {
1169 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1170 if (!rbe)
1171 break;
1172 lines += NUM_LINES(rbe->len);
1173 }
1174 i++;
1175 if (lines > 0 && scroll_position != i) {
1176 scroll_position = i;
1177 redraw_bot_win();
1178 print_scroll_msg();
1179 return;
1180 }
1181 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1182 }
1183
1184 static void com_cancel_scrolling(void)
1185 {
1186
1187 if (scroll_position == 0) {
1188 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1189 return;
1190 }
1191 scroll_position = 0;
1192 redraw_bot_win();
1193 }
1194
1195 static void com_page_down(void)
1196 {
1197 unsigned lines = 0;
1198 int i = scroll_position;
1199
1200 while (lines < bot.lines && --i > 0) {
1201 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1202 if (!rbe)
1203 break;
1204 lines += NUM_LINES(rbe->len);
1205 }
1206 if (lines) {
1207 scroll_position = i;
1208 redraw_bot_win();
1209 print_scroll_msg();
1210 return;
1211 }
1212 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1213 }
1214
1215 static void com_page_up(void)
1216 {
1217 unsigned lines;
1218 int fvr = first_visible_rbe(&lines);
1219
1220 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1221 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1222 return;
1223 }
1224 scroll_position = fvr + 1;
1225 for (; scroll_position > 0; scroll_position--) {
1226 first_visible_rbe(&lines);
1227 if (lines == bot.lines)
1228 break;
1229 }
1230 redraw_bot_win();
1231 print_scroll_msg();
1232 }
1233
1234 static void com_scroll_down(void)
1235 {
1236 struct rb_entry *rbe;
1237 int rbe_lines;
1238
1239 if (!scroll_position) {
1240 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1241 return;
1242 }
1243 scroll_position--;
1244 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1245 rbe_lines = NUM_LINES(rbe->len);
1246 wscrl(bot.win, rbe_lines);
1247 wmove(bot.win, bot.lines - rbe_lines, 0);
1248 wattron(bot.win, COLOR_PAIR(rbe->color));
1249 waddstr(bot.win, rbe->msg);
1250 wrefresh(bot.win);
1251 print_scroll_msg();
1252 }
1253
1254 static void com_scroll_up(void)
1255 {
1256 struct rb_entry *rbe = NULL;
1257 unsigned lines;
1258 int i, first_rbe, num_scroll;
1259
1260 /* the entry that is going to vanish */
1261 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1262 if (!rbe)
1263 goto err_out;
1264 num_scroll = NUM_LINES(rbe->len);
1265 first_rbe = first_visible_rbe(&lines);
1266 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1267 goto err_out;
1268 scroll_position++;
1269 wscrl(bot.win, -num_scroll);
1270 i = draw_top_rbe(&lines);
1271 if (i < 0)
1272 goto err_out;
1273 while (i > 0 && lines < num_scroll) {
1274 int rbe_lines;
1275 rbe = ringbuffer_get(bot_win_rb, --i);
1276 if (!rbe)
1277 break;
1278 rbe_lines = NUM_LINES(rbe->len);
1279 lines += rbe_lines;
1280 // fprintf(stderr, "msg: %s\n", rbe->msg);
1281 wattron(bot.win, COLOR_PAIR(rbe->color));
1282 waddstr(bot.win, "\n");
1283 waddstr(bot.win, rbe->msg);
1284 if (!i)
1285 break;
1286 i--;
1287 }
1288 wrefresh(bot.win);
1289 print_scroll_msg();
1290 return;
1291 err_out:
1292 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1293 }
1294
1295 static void com_ll_decr(void)
1296 {
1297 if (loglevel <= LL_DEBUG) {
1298 print_in_bar(COLOR_ERRMSG,
1299 "loglevel already at maximal verbosity\n");
1300 return;
1301 }
1302 loglevel--;
1303 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1304 }
1305
1306 static void com_ll_incr(void)
1307 {
1308 if (loglevel >= LL_EMERG) {
1309 print_in_bar(COLOR_ERRMSG,
1310 "loglevel already at minimal verbosity\n");
1311 return;
1312 }
1313 loglevel++;
1314 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1315 }
1316
1317 /*
1318 * reread configuration, terminate on errors
1319 */
1320 static void com_reread_conf(void)
1321 {
1322 char *cf = configfile_exists();
1323 struct gui_cmdline_parser_params params = {
1324 .override = 1,
1325 .initialize = 1,
1326 .check_required = 0,
1327 .check_ambiguity = 0,
1328 .print_errors = 0,
1329 };
1330
1331 if (!cf) {
1332 PARA_WARNING_LOG("there is no configuration to read\n");
1333 return;
1334 }
1335 PARA_INFO_LOG("rereading command line options and config file\n");
1336 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1337 /*
1338 * Despite .print_errors is set to 0, gengetopt will print to stderr
1339 * anyway, and exit on errors. So we have to shutdown curses first.
1340 */
1341 shutdown_curses();
1342 gui_cmdline_parser_config_file(cf, &conf, &params);
1343 init_curses();
1344 PARA_NOTICE_LOG("config file reloaded\n");
1345 if (check_key_map_args() < 0)
1346 finish(EXIT_FAILURE);
1347 }
1348
1349 static void com_help(void)
1350 {
1351 int i;
1352
1353 for (i = 0; i < conf.key_map_given; ++i) {
1354 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1355 const char *handler_text = "???", *desc = NULL;
1356
1357 if (!split_key_map(tmp, &handler, &arg)) {
1358 free(tmp);
1359 return;
1360 }
1361 switch (*handler) {
1362 case 'i':
1363 handler_text = "internal";
1364 desc = command_list[find_cmd_byname(arg)].description;
1365 break;
1366 case 'x': handler_text = "external"; break;
1367 case 'd': handler_text = "display "; break;
1368 case 'p': handler_text = "para "; break;
1369 }
1370 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1371 strlen(arg) < 8? "\t" : "",
1372 desc? desc : "");
1373 free(tmp);
1374 }
1375 for (i = 0; command_list[i].handler; i++) {
1376 struct gui_command gc = command_list[i];
1377
1378 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1379 strlen(gc.name) < 8? "\t" : "",
1380 gc.description);
1381 }
1382 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1383 "for more info");
1384 }
1385
1386 static void com_shrink_top_win(void)
1387 {
1388 if (top.lines <= theme.top_lines_min) {
1389 PARA_WARNING_LOG("can not decrease top window\n");
1390 return;
1391 }
1392 init_wins(top.lines - 1);
1393 wclear(top.win);
1394 print_all_items();
1395 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1396 }
1397
1398 static void com_enlarge_top_win(void)
1399 {
1400 if (bot.lines < 3) {
1401 PARA_WARNING_LOG("can not increase top window\n");
1402 return;
1403 }
1404 init_wins(top.lines + 1);
1405 wclear(top.win);
1406 print_all_items();
1407 print_in_bar(COLOR_MSG, "increased top window");
1408 }
1409
1410 static void com_version(void)
1411 {
1412 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1413 }
1414
1415 __noreturn static void com_quit(void)
1416 {
1417 finish(0);
1418 }
1419
1420 static void com_refresh(void)
1421 {
1422 shutdown_curses();
1423 init_curses();
1424 }
1425
1426 static void change_theme(int next)
1427 {
1428 if (next)
1429 next_theme(&theme);
1430 else
1431 prev_theme(&theme);
1432 /* This seems to be needed twice, why? */
1433 com_refresh();
1434 com_refresh();
1435 PARA_NOTICE_LOG("new theme: %s\n", theme.name);
1436 }
1437
1438 static void com_next_theme(void)
1439 {
1440 change_theme(1);
1441 }
1442
1443 static void com_prev_theme(void)
1444 {
1445 change_theme(0);
1446 }
1447
1448
1449 static void handle_command(int c)
1450 {
1451 int i;
1452
1453 /* first check user-defined key bindings */
1454 for (i = 0; i < conf.key_map_given; ++i) {
1455 char *tmp, *handler, *arg;
1456
1457 tmp = para_strdup(conf.key_map_arg[i]);
1458 if (!split_key_map(tmp, &handler, &arg)) {
1459 free(tmp);
1460 return;
1461 }
1462 if (strcmp(tmp, km_keyname(c))) {
1463 free(tmp);
1464 continue;
1465 }
1466 if (*handler == 'd')
1467 display_cmd(arg);
1468 else if (*handler == 'x')
1469 external_cmd(arg);
1470 else if (*handler == 'p')
1471 para_cmd(arg);
1472 else if (*handler == 'i') {
1473 int num = find_cmd_byname(arg);
1474 if (num >= 0)
1475 command_list[num].handler();
1476 }
1477 free(tmp);
1478 return;
1479 }
1480 /* not found, check internal key bindings */
1481 for (i = 0; command_list[i].handler; i++) {
1482 if (!strcmp(km_keyname(c), command_list[i].key)) {
1483 command_list[i].handler();
1484 return;
1485 }
1486 }
1487 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1488 km_keyname(c));
1489 }
1490
1491 __noreturn static void print_help_and_die(void)
1492 {
1493 struct ggo_help h = DEFINE_GGO_HELP(gui);
1494 bool d = conf.detailed_help_given;
1495
1496 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1497 exit(0);
1498 }
1499
1500 int main(int argc, char *argv[])
1501 {
1502 int ret;
1503 char *cf;
1504
1505 _argc = argc;
1506 _argv = argv;
1507
1508 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1509 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1510 version_handle_flag("gui", conf.version_given);
1511 if (conf.help_given || conf.detailed_help_given)
1512 print_help_and_die();
1513 cf = configfile_exists();
1514 if (!cf && conf.config_file_given) {
1515 fprintf(stderr, "can not read config file %s\n",
1516 conf.config_file_arg);
1517 exit(EXIT_FAILURE);
1518 }
1519 if (cf) {
1520 struct gui_cmdline_parser_params params = {
1521 .override = 0,
1522 .initialize = 0,
1523 .check_required = 0,
1524 .check_ambiguity = 0,
1525 .print_errors = 1,
1526 };
1527 gui_cmdline_parser_config_file(cf, &conf, &params);
1528 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1529 }
1530 if (check_key_map_args() < 0) {
1531 fprintf(stderr, "invalid key map\n");
1532 exit(EXIT_FAILURE);
1533 }
1534 init_theme_or_die(conf.theme_arg, &theme);
1535 setup_signal_handling();
1536 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1537 setlocale(LC_CTYPE, "");
1538 initscr(); /* needed only once, always successful */
1539 init_curses();
1540 print_welcome();
1541 for (;;) {
1542 print_status_bar();
1543 ret = do_select(GETCH_MODE);
1544 if (!ret)
1545 continue;
1546 print_in_bar(COLOR_MSG, " ");
1547 handle_command(ret);
1548 }
1549 }