gui: Check return values of curses functions more strictly.
[paraslash.git] / gui.c
1 /*
2 * Copyright (C) 1998-2011 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 <dirent.h>
13 #include <curses.h>
14
15 #include "gui.cmdline.h"
16 #include "para.h"
17 #include "gui.h"
18 #include "string.h"
19 #include "ringbuffer.h"
20 #include "fd.h"
21 #include "error.h"
22 #include "list.h"
23 #include "sched.h"
24 #include "signal.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 NCURSES_SIZE_T begx;
37 NCURSES_SIZE_T begy;
38 NCURSES_SIZE_T cols;
39 NCURSES_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 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 /* first rbe might be only partially visible */
404 offset = (*lines - bot.lines) * bot.cols;
405 len = strlen(rbe->msg);
406 if (offset < 0 || len < offset)
407 return -1;
408 wattron(bot.win, COLOR_PAIR(rbe->color));
409 waddstr(bot.win, rbe->msg + offset);
410 *lines = NUM_LINES(len - offset);
411 return fvr;
412 }
413
414 static void redraw_bot_win(void)
415 {
416 unsigned lines;
417 int i;
418
419 wmove(bot.win, 0, 0);
420 wclear(bot.win);
421 i = draw_top_rbe(&lines);
422 if (i <= 0)
423 goto out;
424 while (i > 0 && lines < bot.lines) {
425 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
426 if (!rbe) {
427 lines++;
428 waddstr(bot.win, "\n");
429 continue;
430 }
431 lines += NUM_LINES(rbe->len);
432 wattron(bot.win, COLOR_PAIR(rbe->color));
433 waddstr(bot.win, "\n");
434 waddstr(bot.win, rbe->msg);
435 }
436 out:
437 wrefresh(bot.win);
438 }
439
440 static void rb_add_entry(int color, char *msg)
441 {
442 struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
443 int x, y;
444 new->color = color;
445 new->len = strlen(msg);
446 new->msg = msg;
447 old = ringbuffer_add(bot_win_rb, new);
448 // fprintf(stderr, "added: %s\n", new->msg);
449 if (old) {
450 free(old->msg);
451 free(old);
452 }
453 if (scroll_position) {
454 /* discard current scrolling, like xterm does */
455 scroll_position = 0;
456 redraw_bot_win();
457 return;
458 }
459 wattron(bot.win, COLOR_PAIR(color));
460 getyx(bot.win, y, x);
461 if (y || x)
462 waddstr(bot.win, "\n");
463 waddstr(bot.win, msg);
464 }
465
466 /*
467 * print formated output to bot win and refresh
468 */
469 __printf_2_3 static void outputf(int color, const char* fmt,...)
470 {
471 char *msg;
472
473 if (!curses_active)
474 return;
475 PARA_VSPRINTF(fmt, msg);
476 rb_add_entry(color, msg);
477 wrefresh(bot.win);
478 }
479
480 static int add_output_line(char *line, __a_unused void *data)
481 {
482 if (!curses_active)
483 return 1;
484 rb_add_entry(COLOR_OUTPUT, para_strdup(line));
485 return 1;
486 }
487
488 static int loglevel;
489
490 __printf_2_3 void para_log(int ll, const char *fmt,...)
491 {
492 int color;
493 char *msg;
494
495 if (ll < loglevel || !curses_active)
496 return;
497 switch (ll) {
498 case LL_DEBUG:
499 case LL_INFO:
500 case LL_NOTICE:
501 color = COLOR_MSG;
502 break;
503 default:
504 color = COLOR_ERRMSG;
505 }
506 PARA_VSPRINTF(fmt, msg);
507 chop(msg);
508 rb_add_entry(color, msg);
509 wrefresh(bot.win);
510 }
511
512 static void setup_signal_handling(void)
513 {
514 signal_pipe = para_signal_init();
515 para_install_sighandler(SIGINT);
516 para_install_sighandler(SIGTERM);
517 para_install_sighandler(SIGCHLD);
518 para_install_sighandler(SIGWINCH);
519 para_install_sighandler(SIGUSR1);
520 para_sigaction(SIGHUP, SIG_IGN);
521 }
522
523 __noreturn static void do_exit(int ret)
524 {
525 para_sigaction(SIGTERM, SIG_IGN);
526 kill(0, SIGTERM);
527 exit(ret);
528 }
529
530 static void shutdown_curses(void)
531 {
532 if (!curses_active)
533 return;
534 def_prog_mode();
535 curses_active = 0;
536 endwin();
537 }
538
539 __noreturn static void finish(int ret)
540 {
541 shutdown_curses();
542 do_exit(ret);
543 }
544
545 /*
546 * exit curses and print given message to stdout/stderr
547 */
548 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
549 {
550 va_list argp;
551 FILE *outfd = ret? stderr: stdout;
552
553 shutdown_curses();
554 va_start(argp, fmt);
555 vfprintf(outfd, fmt, argp);
556 va_end(argp);
557 do_exit(ret);
558 }
559
560 static void print_welcome(void)
561 {
562 if (loglevel > LL_NOTICE)
563 return;
564 outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
565 " \"" CODENAME "\". Theme: %s", theme.name);
566 wclrtoeol(bot.win);
567 }
568
569 /*
570 * init all windows
571 */
572 static void init_wins(int top_lines)
573 {
574 int i;
575
576 top.lines = top_lines;
577 top.cols = COLS;
578 top.begy = 0;
579 top.begx = 0;
580
581 bot.lines = LINES - top.lines - 3;
582 bot.cols = COLS;
583 bot.begy = top.lines + 1;
584 bot.begx = 0;
585
586 sb.lines = 1;
587 sb.cols = COLS;
588 sb.begy = LINES - 2;
589 sb.begx = 0;
590
591 in.lines = 1;
592 in.cols = COLS;
593 in.begy = LINES - 1;
594 in.begx = 0;
595
596 sep.lines = 1;
597 sep.cols = COLS;
598 sep.begy = top.lines;
599 sep.begx = 0;
600
601 assume_default_colors(theme.default_fg, theme.default_bg);
602 if (top.win) {
603 mvwin(top.win, top.begy, top.begx);
604 wresize(top.win, top.lines, top.cols);
605
606 mvwin(sb.win, sb.begy, sb.begx);
607 wresize(sb.win, sb.lines, sb.cols);
608
609 mvwin(sep.win, sep.begy, sep.begx);
610 wresize(sep.win, sep.lines, sep.cols);
611
612 mvwin(bot.win, bot.begy, bot.begx);
613 wresize(bot.win, bot.lines, bot.cols);
614
615 mvwin(in.win, in.begy, in.begx);
616 wresize(in.win, in.lines, in.cols);
617 } else {
618 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
619 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
620 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
621 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
622 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
623 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
624 msg_n_exit(1, "Error: Cannot create curses windows\n");
625 wclear(bot.win);
626 wclear(sb.win);
627 wclear(in.win);
628 scrollok(bot.win, 1);
629 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
630 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
631 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
632 wattron(top.win, COLOR_PAIR(COLOR_TOP));
633 nodelay(top.win, 1);
634 nodelay(bot.win, 1);
635 nodelay(sb.win, 1);
636 nodelay(in.win, 0);
637
638 keypad(top.win, 1);
639 keypad(bot.win, 1);
640 keypad(sb.win, 1);
641 keypad(in.win, 1);
642 print_status_bar();
643 }
644 wmove(sep.win, 0, 0);
645 for (i = 1; i <= COLS; i++)
646 waddstr(sep.win, theme.sep_str);
647 wclear(top.win);
648 //wclear(bot.win);
649 wnoutrefresh(top.win);
650 wnoutrefresh(bot.win);
651 //wnoutrefresh(sb.win);
652 print_status_bar();
653 wnoutrefresh(in.win);
654 wnoutrefresh(sep.win);
655 doupdate();
656 }
657
658 /*
659 * Print stat item #i to curses window
660 */
661 static void print_stat_item(int i)
662 {
663 char *tmp;
664 struct stat_item_data d = theme.data[i];
665 char *c = stat_content[i];
666
667 if (!curses_active || !d.len || !c)
668 return;
669 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
670 wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
671 wrefresh(top.win);
672 wattron(top.win, COLOR_PAIR(i + 1));
673 align_str(top.win, tmp, d.len * COLS / 100, d.align);
674 free(tmp);
675 wrefresh(top.win);
676 }
677
678 static int update_item(int item_num, char *buf)
679 {
680 char **c = stat_content + item_num;
681
682 free(*c);
683 if (buf && buf[0])
684 goto dup;
685 switch (item_num) {
686 case SI_ARTIST:
687 *c = para_strdup("(artist tag not set)");
688 goto print;
689 case SI_TITLE:
690 *c = para_strdup("(title tag not set)");
691 goto print;
692 case SI_YEAR:
693 *c = para_strdup("????");
694 goto print;
695 case SI_ALBUM:
696 *c = para_strdup("(album tag not set)");
697 goto print;
698 case SI_COMMENT:
699 *c = para_strdup("(comment tag not set)");
700 goto print;
701 }
702 dup:
703 *c = para_strdup(buf);
704 print:
705 print_stat_item(item_num);
706 return 1;
707 }
708
709 static int read_stat_pipe(fd_set *rfds)
710 {
711 static char *buf;
712 static int bufsize, loaded;
713 int ret, ret2;
714 size_t sz;
715
716 if (stat_pipe < 0)
717 return 0;
718 if (loaded >= bufsize) {
719 if (bufsize > 1000 * 1000) {
720 loaded = 0;
721 return 0;
722 }
723 bufsize += bufsize + 1000;
724 buf = para_realloc(buf, bufsize);
725 }
726 assert(loaded < bufsize);
727 ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
728 rfds, &sz);
729 loaded += sz;
730 ret2 = for_each_stat_item(buf, loaded, update_item);
731 if (ret < 0 || ret2 < 0) {
732 loaded = 0;
733 return ret2 < 0? ret2 : ret;
734 }
735 sz = ret2; /* what is left */
736 if (sz > 0 && sz < loaded)
737 memmove(buf, buf + loaded - sz, sz);
738 loaded = sz;
739 return 1;
740 }
741
742 static void print_all_items(void)
743 {
744 int i;
745
746 if (!curses_active)
747 return;
748 FOR_EACH_STATUS_ITEM(i)
749 print_stat_item(i);
750 }
751
752 static void clear_all_items(void)
753 {
754 int i;
755
756 FOR_EACH_STATUS_ITEM(i) {
757 free(stat_content[i]);
758 stat_content[i] = para_strdup("");
759 }
760 }
761
762 static void init_pair_or_die(short pair, short f, short b)
763 {
764 if (init_pair(pair, f, b) == ERR)
765 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
766 }
767
768 static void init_colors_or_die(void)
769 {
770 int i;
771
772 if (!has_colors())
773 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
774 if (start_color() == ERR)
775 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
776 FOR_EACH_STATUS_ITEM(i)
777 if (theme.data[i].len)
778 init_pair_or_die(i + 1, theme.data[i].fg,
779 theme.data[i].bg);
780 init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
781 init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
782 init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
783 init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
784 init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
785 init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
786 init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
787 init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
788 init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
789 }
790
791 /* (Re-)initialize the curses library. */
792 static void init_curses(void)
793 {
794 curses_active = 1;
795 if (top.win && refresh() == ERR) /* refesh is really needed */
796 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
797 if (LINES < theme.lines_min || COLS < theme.cols_min)
798 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
799 " (need at least %dx%d)\n", COLS, LINES,
800 theme.cols_min, theme.lines_min);
801 curs_set(0); /* make cursor invisible, ignore errors */
802 nonl(); /* do not NL->CR/NL on output, always returns OK */
803 /* don't echo input */
804 if (noecho() == ERR)
805 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
806 /* take input chars one at a time, no wait for \n */
807 if (cbreak() == ERR)
808 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
809 init_colors_or_die();
810 clear(); /* ignore non-fatal errors */
811 init_wins(theme.top_lines_default);
812 print_all_items();
813 // noecho(); /* don't echo input */
814 }
815
816 static void check_sigchld(void)
817 {
818 int ret;
819 pid_t pid;
820 reap_next_child:
821 ret = para_reap_child(&pid);
822 if (ret <= 0)
823 return;
824 if (pid == cmd_pid) {
825 cmd_pid = 0;
826 cmd_died = 1;
827 }
828 goto reap_next_child;
829 }
830
831 /*
832 * This sucker modifies its first argument. *handler and *arg are
833 * pointers to 0-terminated strings (inside line). Crap.
834 */
835 static int split_key_map(char *line, char **handler, char **arg)
836 {
837 if (!(*handler = strchr(line + 1, ':')))
838 goto err_out;
839 **handler = '\0';
840 (*handler)++;
841 if (!(*arg = strchr(*handler, ':')))
842 goto err_out;
843 **arg = '\0';
844 (*arg)++;
845 return 1;
846 err_out:
847 return 0;
848 }
849
850 static int check_key_map_args(void)
851 {
852 char *s;
853 int i, ret = -1;
854 char *tmp = NULL, *handler, *arg;
855
856 for (i = 0; i < conf.key_map_given; ++i) {
857 s = conf.key_map_arg[i];
858 if (!(*s))
859 goto err_out;
860 free(tmp);
861 tmp = para_strdup(s);
862 if (!split_key_map(tmp, &handler, &arg))
863 goto err_out;
864 if (strlen(handler) != 1)
865 goto err_out;
866 if (*handler != 'x'
867 && *handler != 'd'
868 && *handler != 'i'
869 && *handler != 'p')
870 goto err_out;
871 if (*handler != 'i')
872 continue;
873 if (find_cmd_byname(arg) < 0)
874 goto err_out;
875 }
876 ret = 0;
877 err_out:
878 free(tmp);
879 return ret;
880 }
881
882 /*
883 * React to various signal-related events
884 */
885 static void handle_signal(int sig)
886 {
887 switch (sig) {
888 case SIGTERM:
889 msg_n_exit(EXIT_FAILURE,
890 "only the good die young (caught SIGTERM))\n");
891 return;
892 case SIGWINCH:
893 if (curses_active) {
894 shutdown_curses();
895 init_curses();
896 redraw_bot_win();
897 }
898 return;
899 case SIGINT:
900 PARA_WARNING_LOG("caught SIGINT, reset");
901 /* Nothing to do. SIGINT killed our child which gets noticed
902 * by do_select and resets everything.
903 */
904 return;
905 case SIGUSR1:
906 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
907 com_reread_conf();
908 return;
909 case SIGCHLD:
910 check_sigchld();
911 return;
912 }
913 }
914
915 static int open_stat_pipe(void)
916 {
917 static int init = 1;
918 int ret, fds[3] = {0, 1, 0};
919 pid_t pid;
920
921 if (init)
922 init = 0;
923 else
924 /*
925 * Sleep a bit to avoid a busy loop. As the call to sleep() may
926 * be interrupted by SIGCHLD, we simply wait until the call
927 * succeeds.
928 */
929 while (sleep(2))
930 ; /* nothing */
931 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
932 if (ret < 0)
933 return ret;
934 ret = mark_fd_nonblocking(fds[1]);
935 if (ret >= 0)
936 return fds[1];
937 close(fds[1]);
938 return ret;
939 }
940
941 /*
942 * This is the core select loop. Besides the (internal) signal
943 * pipe, the following other fds are checked according to the mode:
944 *
945 * GETCH_MODE: check stdin, return when key is pressed
946 *
947 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
948 * of output has been read or when other end has closed command pipe or
949 * when any key is pressed.
950 *
951 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
952 * is running. During that time curses is disabled. Returns when
953 * cmd_pid == 0.
954 */
955 static int do_select(int mode)
956 {
957 fd_set rfds;
958 int ret;
959 int max_fileno;
960 char command_buf[4096] = "";
961 int cbo = 0; /* command buf offset */
962 struct timeval tv;
963 repeat:
964 tv.tv_sec = conf.timeout_arg / 1000;
965 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
966 // ret = refresh_status();
967 FD_ZERO(&rfds);
968 max_fileno = 0;
969 if (stat_pipe < 0)
970 stat_pipe = open_stat_pipe();
971 if (stat_pipe >= 0)
972 para_fd_set(stat_pipe, &rfds, &max_fileno);
973 /* signal pipe */
974 para_fd_set(signal_pipe, &rfds, &max_fileno);
975 /* command pipe only for COMMAND_MODE */
976 if (command_pipe >= 0 && mode == COMMAND_MODE)
977 para_fd_set(command_pipe, &rfds, &max_fileno);
978 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
979 if (ret <= 0)
980 goto check_return; /* skip fd checks */
981 /* signals */
982 ret = para_next_signal(&rfds);
983 if (ret > 0)
984 handle_signal(ret);
985 /* read command pipe if ready */
986 if (command_pipe >= 0 && mode == COMMAND_MODE) {
987 size_t sz;
988 ret = read_nonblock(command_pipe, command_buf + cbo,
989 sizeof(command_buf) - 1 - cbo, &rfds, &sz);
990 cbo += sz;
991 sz = cbo;
992 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
993 if (sz != cbo)
994 wrefresh(bot.win);
995 if (ret < 0) {
996 PARA_NOTICE_LOG("closing command pipe: %s",
997 para_strerror(-ret));
998 close(command_pipe);
999 command_pipe = -1;
1000 return 0;
1001 }
1002 }
1003 ret = read_stat_pipe(&rfds);
1004 if (ret < 0) {
1005 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1006 close(stat_pipe);
1007 stat_pipe = -1;
1008 clear_all_items();
1009 free(stat_content[SI_BASENAME]);
1010 stat_content[SI_BASENAME] =
1011 para_strdup("stat command terminated!?");
1012 print_all_items();
1013 }
1014 check_return:
1015 switch (mode) {
1016 case COMMAND_MODE:
1017 ret = wgetch(top.win);
1018 if (ret != ERR && ret != KEY_RESIZE) {
1019 if (command_pipe) {
1020 close(command_pipe);
1021 command_pipe = -1;
1022 }
1023 if (cmd_pid)
1024 kill(cmd_pid, SIGTERM);
1025 return -1;
1026 }
1027 break;
1028 case GETCH_MODE:
1029 ret = wgetch(top.win);
1030 if (ret != ERR && ret != KEY_RESIZE)
1031 return ret;
1032 break;
1033 case EXTERNAL_MODE:
1034 if (cmd_died) {
1035 cmd_died = 0;
1036 return 0;
1037 }
1038 }
1039 goto repeat;
1040 }
1041
1042 /*
1043 * read from command pipe and print data to bot window
1044 */
1045 static int send_output(void)
1046 {
1047 int ret;
1048
1049 if (command_pipe < 0)
1050 return 0;
1051 ret = mark_fd_nonblocking(command_pipe);
1052 if (ret < 0) {
1053 close(command_pipe);
1054 return ret;
1055 }
1056 if (do_select(COMMAND_MODE) >= 0)
1057 PARA_INFO_LOG("command complete");
1058 else
1059 PARA_NOTICE_LOG("command aborted");
1060 print_in_bar(COLOR_MSG, " ");
1061 return 1;
1062 }
1063
1064 static int client_cmd_cmdline(char *cmd)
1065 {
1066 int ret, fds[3] = {0, 1, 0};
1067 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1068
1069 outputf(COLOR_COMMAND, "%s", c);
1070 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1071 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1072 free(c);
1073 if (ret < 0)
1074 return -1;
1075 command_pipe = fds[1];
1076 return send_output();
1077 }
1078
1079 /*
1080 * exec command and print output to bot win
1081 */
1082 static int display_cmd(char *cmd)
1083 {
1084 int fds[3] = {0, 1, 0};
1085
1086 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1087 outputf(COLOR_COMMAND, "%s", cmd);
1088 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1089 return -1;
1090 command_pipe = fds[1];
1091 return send_output();
1092 }
1093
1094 /*
1095 * shutdown curses and stat pipe before executing external commands
1096 */
1097 static int external_cmd(char *cmd)
1098 {
1099 int fds[3] = {-1, -1, -1};
1100
1101 if (cmd_pid)
1102 return -1;
1103 shutdown_curses();
1104 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1105 cmd_died = 0;
1106 do_select(EXTERNAL_MODE);
1107 init_curses();
1108 return 0;
1109 }
1110
1111 static void print_scroll_msg(void)
1112 {
1113 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1114 int first_rbe = first_visible_rbe(&lines_total);
1115 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1116 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1117 }
1118
1119 static void com_scroll_top(void)
1120 {
1121 int i = RINGBUFFER_SIZE - 1;
1122 unsigned lines = 0;
1123
1124 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1125 i--;
1126 /* i is oldest entry */
1127 for (; lines < bot.lines && i >= 0; i--) {
1128 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1129 if (!rbe)
1130 break;
1131 lines += NUM_LINES(strlen(rbe->msg));
1132 }
1133 i++;
1134 if (lines > 0 && scroll_position != i) {
1135 scroll_position = i;
1136 redraw_bot_win();
1137 print_scroll_msg();
1138 return;
1139 }
1140 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1141 }
1142
1143 static void com_cancel_scrolling(void)
1144 {
1145
1146 if (scroll_position == 0) {
1147 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1148 return;
1149 }
1150 scroll_position = 0;
1151 redraw_bot_win();
1152 }
1153
1154 static void com_page_down(void)
1155 {
1156 unsigned lines = 0;
1157 int i = scroll_position;
1158 while (lines < bot.lines && --i > 0) {
1159 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1160 if (!rbe)
1161 break;
1162 lines += NUM_LINES(strlen(rbe->msg));
1163 }
1164 if (lines) {
1165 scroll_position = i;
1166 redraw_bot_win();
1167 print_scroll_msg();
1168 return;
1169 }
1170 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1171 }
1172
1173 static void com_page_up(void)
1174 {
1175 unsigned lines;
1176 int fvr = first_visible_rbe(&lines);
1177
1178 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1179 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1180 return;
1181 }
1182 scroll_position = fvr + 1;
1183 for (; scroll_position > 0; scroll_position--) {
1184 first_visible_rbe(&lines);
1185 if (lines == bot.lines)
1186 break;
1187 }
1188 redraw_bot_win();
1189 print_scroll_msg();
1190 }
1191
1192 static void com_scroll_down(void)
1193 {
1194 struct rb_entry *rbe;
1195 int rbe_lines;
1196
1197 if (!scroll_position) {
1198 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1199 return;
1200 }
1201 scroll_position--;
1202 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1203 rbe_lines = NUM_LINES(rbe->len);
1204 wscrl(bot.win, rbe_lines);
1205 wmove(bot.win, bot.lines - rbe_lines, 0);
1206 wattron(bot.win, COLOR_PAIR(rbe->color));
1207 waddstr(bot.win, rbe->msg);
1208 wrefresh(bot.win);
1209 print_scroll_msg();
1210 }
1211
1212 static void com_scroll_up(void)
1213 {
1214 struct rb_entry *rbe = NULL;
1215 unsigned lines;
1216 int i, first_rbe, num_scroll;
1217
1218 /* the entry that is going to vanish */
1219 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1220 if (!rbe)
1221 goto err_out;
1222 num_scroll = NUM_LINES(rbe->len);
1223 first_rbe = first_visible_rbe(&lines);
1224 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1225 goto err_out;
1226 scroll_position++;
1227 wscrl(bot.win, -num_scroll);
1228 i = draw_top_rbe(&lines);
1229 if (i < 0)
1230 goto err_out;
1231 while (i > 0 && lines < num_scroll) {
1232 int rbe_lines;
1233 rbe = ringbuffer_get(bot_win_rb, --i);
1234 if (!rbe)
1235 break;
1236 rbe_lines = NUM_LINES(rbe->len);
1237 lines += rbe_lines;
1238 // fprintf(stderr, "msg: %s\n", rbe->msg);
1239 wattron(bot.win, COLOR_PAIR(rbe->color));
1240 waddstr(bot.win, "\n");
1241 waddstr(bot.win, rbe->msg);
1242 if (!i)
1243 break;
1244 i--;
1245 }
1246 wrefresh(bot.win);
1247 print_scroll_msg();
1248 return;
1249 err_out:
1250 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1251 }
1252
1253 static void com_ll_decr(void)
1254 {
1255 if (loglevel <= LL_DEBUG) {
1256 print_in_bar(COLOR_ERRMSG,
1257 "loglevel already at maximal verbosity\n");
1258 return;
1259 }
1260 loglevel--;
1261 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1262 }
1263
1264 static void com_ll_incr(void)
1265 {
1266 if (loglevel >= LL_EMERG) {
1267 print_in_bar(COLOR_ERRMSG,
1268 "loglevel already at minimal verbosity\n");
1269 return;
1270 }
1271 loglevel++;
1272 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1273 }
1274
1275 /*
1276 * reread configuration, terminate on errors
1277 */
1278 static void com_reread_conf(void)
1279 {
1280 char *cf =configfile_exists();
1281 struct gui_cmdline_parser_params params = {
1282 .override = 1,
1283 .initialize = 1,
1284 .check_required = 0,
1285 .check_ambiguity = 0,
1286 .print_errors = 0,
1287 };
1288
1289 if (!cf) {
1290 PARA_WARNING_LOG("there is no configuration to read");
1291 return;
1292 }
1293 PARA_INFO_LOG("rereading command line options and config file");
1294 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1295 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1296 PARA_EMERG_LOG("errors in config file");
1297 finish(EXIT_FAILURE);
1298 }
1299 PARA_NOTICE_LOG("config file reloaded");
1300 if (check_key_map_args() < 0)
1301 finish(EXIT_FAILURE);
1302 }
1303
1304 static void com_help(void)
1305 {
1306 int i;
1307
1308 for (i = 0; i < conf.key_map_given; ++i) {
1309 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1310 const char *handler_text = "???", *desc = NULL;
1311
1312 if (!split_key_map(tmp, &handler, &arg)) {
1313 free(tmp);
1314 return;
1315 }
1316 switch (*handler) {
1317 case 'i':
1318 handler_text = "internal";
1319 desc = command_list[find_cmd_byname(arg)].description;
1320 break;
1321 case 'x': handler_text = "external"; break;
1322 case 'd': handler_text = "display "; break;
1323 case 'p': handler_text = "para "; break;
1324 }
1325 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1326 strlen(arg) < 8? "\t" : "",
1327 desc? desc : "");
1328 free(tmp);
1329 }
1330 for (i = 0; command_list[i].handler; i++) {
1331 struct gui_command gc = command_list[i];
1332
1333 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1334 strlen(gc.name) < 8? "\t" : "",
1335 gc.description);
1336 }
1337 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1338 "for more info");
1339 }
1340
1341 static void com_shrink_top_win(void)
1342 {
1343 if (top.lines <= theme.top_lines_min) {
1344 PARA_WARNING_LOG("can not decrease top window");
1345 return;
1346 }
1347 init_wins(top.lines - 1);
1348 wclear(top.win);
1349 print_all_items();
1350 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1351 }
1352
1353 static void com_enlarge_top_win(void)
1354 {
1355 if (bot.lines < 3) {
1356 PARA_WARNING_LOG("can not increase top window");
1357 return;
1358 }
1359 init_wins(top.lines + 1);
1360 wclear(top.win);
1361 print_all_items();
1362 print_in_bar(COLOR_MSG, "increased top window");
1363 }
1364
1365 static void com_version(void)
1366 {
1367 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1368 CODENAME "\"");
1369 }
1370
1371 __noreturn static void com_quit(void)
1372 {
1373 finish(0);
1374 }
1375
1376 static void com_refresh(void)
1377 {
1378 shutdown_curses();
1379 init_curses();
1380 }
1381
1382 static void change_theme(int next)
1383 {
1384 if (next)
1385 next_theme(&theme);
1386 else
1387 prev_theme(&theme);
1388 /* This seems to be needed twice, why? */
1389 com_refresh();
1390 com_refresh();
1391 PARA_NOTICE_LOG("new theme: %s", theme.name);
1392 }
1393
1394 static void com_next_theme(void)
1395 {
1396 change_theme(1);
1397 }
1398
1399 static void com_prev_theme(void)
1400 {
1401 change_theme(0);
1402 }
1403
1404
1405 static void handle_command(int c)
1406 {
1407 int i;
1408
1409 /* first check user's key bindings */
1410 for (i = 0; i < conf.key_map_given; ++i) {
1411 char *tmp, *handler, *arg;
1412
1413 tmp = para_strdup(conf.key_map_arg[i]);
1414 if (!split_key_map(tmp, &handler, &arg)) {
1415 free(tmp);
1416 return;
1417 }
1418 if (strcmp(tmp, km_keyname(c))) {
1419 free(tmp);
1420 continue;
1421 }
1422 if (*handler == 'd')
1423 display_cmd(arg);
1424 else if (*handler == 'x')
1425 external_cmd(arg);
1426 else if (*handler == 'p')
1427 client_cmd_cmdline(arg);
1428 else if (*handler == 'i') {
1429 int num = find_cmd_byname(arg);
1430 if (num >= 0)
1431 command_list[num].handler();
1432 }
1433 free(tmp);
1434 return;
1435 }
1436 /* not found, check internal key bindings */
1437 for (i = 0; command_list[i].handler; i++) {
1438 if (!strcmp(km_keyname(c), command_list[i].key)) {
1439 command_list[i].handler();
1440 return;
1441 }
1442 }
1443 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1444 km_keyname(c));
1445 }
1446
1447 int main(int argc, char *argv[])
1448 {
1449 int ret;
1450 char *cf;
1451
1452 _argc = argc;
1453 _argv = argv;
1454
1455 if (gui_cmdline_parser(argc, argv, &conf) != 0)
1456 exit(EXIT_FAILURE);
1457 HANDLE_VERSION_FLAG("gui", conf);
1458 cf = configfile_exists();
1459 if (!cf && conf.config_file_given) {
1460 fprintf(stderr, "can not read config file %s\n",
1461 conf.config_file_arg);
1462 exit(EXIT_FAILURE);
1463 }
1464 if (cf) {
1465 struct gui_cmdline_parser_params params = {
1466 .override = 0,
1467 .initialize = 0,
1468 .check_required = 0,
1469 .check_ambiguity = 0,
1470 .print_errors = 1,
1471 };
1472 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1473 exit(EXIT_FAILURE);
1474 }
1475 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1476 if (check_key_map_args() < 0) {
1477 fprintf(stderr, "invalid key map\n");
1478 exit(EXIT_FAILURE);
1479 }
1480 init_theme_or_die(conf.theme_arg, &theme);
1481 top.lines = theme.top_lines_default;
1482 setup_signal_handling();
1483 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1484 initscr(); /* needed only once, always successful */
1485 init_curses();
1486 print_welcome();
1487 for (;;) {
1488 print_status_bar();
1489 ret = do_select(GETCH_MODE);
1490 if (!ret)
1491 continue;
1492 print_in_bar(COLOR_MSG, " ");
1493 handle_command(ret);
1494 }
1495 }