gui: Open-code check_geometry().
[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_colors(void)
763 {
764 int i;
765
766 if (!has_colors())
767 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
768 start_color();
769 FOR_EACH_STATUS_ITEM(i)
770 if (theme.data[i].len)
771 init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
772 init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
773 init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
774 init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
775 init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
776 init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
777 init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
778 init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
779 init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
780 init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
781 }
782
783 /* (Re-)initialize the curses library. FIXME: Error checking. */
784 static void init_curses(void)
785 {
786 curses_active = 1;
787 if (top.win && refresh() == ERR) /* refesh is really needed */
788 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
789 if (LINES < theme.lines_min || COLS < theme.cols_min)
790 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
791 " (need at least %dx%d)\n", COLS, LINES,
792 theme.cols_min, theme.lines_min);
793 curs_set(0); /* make cursor invisible, ignore errors */
794 nonl(); /* tell curses not to do NL->CR/NL on output */
795 noecho(); /* don't echo input */
796 cbreak(); /* take input chars one at a time, no wait for \n */
797 init_colors();
798 clear();
799 init_wins(theme.top_lines_default);
800 print_all_items();
801 noecho(); /* don't echo input */
802 }
803
804 static void check_sigchld(void)
805 {
806 int ret;
807 pid_t pid;
808 reap_next_child:
809 ret = para_reap_child(&pid);
810 if (ret <= 0)
811 return;
812 if (pid == cmd_pid) {
813 cmd_pid = 0;
814 cmd_died = 1;
815 }
816 goto reap_next_child;
817 }
818
819 /*
820 * This sucker modifies its first argument. *handler and *arg are
821 * pointers to 0-terminated strings (inside line). Crap.
822 */
823 static int split_key_map(char *line, char **handler, char **arg)
824 {
825 if (!(*handler = strchr(line + 1, ':')))
826 goto err_out;
827 **handler = '\0';
828 (*handler)++;
829 if (!(*arg = strchr(*handler, ':')))
830 goto err_out;
831 **arg = '\0';
832 (*arg)++;
833 return 1;
834 err_out:
835 return 0;
836 }
837
838 static int check_key_map_args(void)
839 {
840 char *s;
841 int i, ret = -1;
842 char *tmp = NULL, *handler, *arg;
843
844 for (i = 0; i < conf.key_map_given; ++i) {
845 s = conf.key_map_arg[i];
846 if (!(*s))
847 goto err_out;
848 free(tmp);
849 tmp = para_strdup(s);
850 if (!split_key_map(tmp, &handler, &arg))
851 goto err_out;
852 if (strlen(handler) != 1)
853 goto err_out;
854 if (*handler != 'x'
855 && *handler != 'd'
856 && *handler != 'i'
857 && *handler != 'p')
858 goto err_out;
859 if (*handler != 'i')
860 continue;
861 if (find_cmd_byname(arg) < 0)
862 goto err_out;
863 }
864 ret = 0;
865 err_out:
866 free(tmp);
867 return ret;
868 }
869
870 /*
871 * React to various signal-related events
872 */
873 static void handle_signal(int sig)
874 {
875 switch (sig) {
876 case SIGTERM:
877 msg_n_exit(EXIT_FAILURE,
878 "only the good die young (caught SIGTERM))\n");
879 return;
880 case SIGWINCH:
881 if (curses_active) {
882 shutdown_curses();
883 init_curses();
884 redraw_bot_win();
885 }
886 return;
887 case SIGINT:
888 PARA_WARNING_LOG("caught SIGINT, reset");
889 /* Nothing to do. SIGINT killed our child which gets noticed
890 * by do_select and resets everything.
891 */
892 return;
893 case SIGUSR1:
894 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
895 com_reread_conf();
896 return;
897 case SIGCHLD:
898 check_sigchld();
899 return;
900 }
901 }
902
903 static int open_stat_pipe(void)
904 {
905 static int init = 1;
906 int ret, fds[3] = {0, 1, 0};
907 pid_t pid;
908
909 if (init)
910 init = 0;
911 else
912 /*
913 * Sleep a bit to avoid a busy loop. As the call to sleep() may
914 * be interrupted by SIGCHLD, we simply wait until the call
915 * succeeds.
916 */
917 while (sleep(2))
918 ; /* nothing */
919 ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
920 if (ret < 0)
921 return ret;
922 ret = mark_fd_nonblocking(fds[1]);
923 if (ret >= 0)
924 return fds[1];
925 close(fds[1]);
926 return ret;
927 }
928
929 /*
930 * This is the core select loop. Besides the (internal) signal
931 * pipe, the following other fds are checked according to the mode:
932 *
933 * GETCH_MODE: check stdin, return when key is pressed
934 *
935 * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
936 * of output has been read or when other end has closed command pipe or
937 * when any key is pressed.
938 *
939 * EXTERNAL_MODE: Check only signal pipe. Used when an external command
940 * is running. During that time curses is disabled. Returns when
941 * cmd_pid == 0.
942 */
943 static int do_select(int mode)
944 {
945 fd_set rfds;
946 int ret;
947 int max_fileno;
948 char command_buf[4096] = "";
949 int cbo = 0; /* command buf offset */
950 struct timeval tv;
951 repeat:
952 tv.tv_sec = conf.timeout_arg / 1000;
953 tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
954 // ret = refresh_status();
955 FD_ZERO(&rfds);
956 max_fileno = 0;
957 if (stat_pipe < 0)
958 stat_pipe = open_stat_pipe();
959 if (stat_pipe >= 0)
960 para_fd_set(stat_pipe, &rfds, &max_fileno);
961 /* signal pipe */
962 para_fd_set(signal_pipe, &rfds, &max_fileno);
963 /* command pipe only for COMMAND_MODE */
964 if (command_pipe >= 0 && mode == COMMAND_MODE)
965 para_fd_set(command_pipe, &rfds, &max_fileno);
966 ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
967 if (ret <= 0)
968 goto check_return; /* skip fd checks */
969 /* signals */
970 ret = para_next_signal(&rfds);
971 if (ret > 0)
972 handle_signal(ret);
973 /* read command pipe if ready */
974 if (command_pipe >= 0 && mode == COMMAND_MODE) {
975 size_t sz;
976 ret = read_nonblock(command_pipe, command_buf + cbo,
977 sizeof(command_buf) - 1 - cbo, &rfds, &sz);
978 cbo += sz;
979 sz = cbo;
980 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
981 if (sz != cbo)
982 wrefresh(bot.win);
983 if (ret < 0) {
984 PARA_NOTICE_LOG("closing command pipe: %s",
985 para_strerror(-ret));
986 close(command_pipe);
987 command_pipe = -1;
988 return 0;
989 }
990 }
991 ret = read_stat_pipe(&rfds);
992 if (ret < 0) {
993 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
994 close(stat_pipe);
995 stat_pipe = -1;
996 clear_all_items();
997 free(stat_content[SI_BASENAME]);
998 stat_content[SI_BASENAME] =
999 para_strdup("stat command terminated!?");
1000 print_all_items();
1001 }
1002 check_return:
1003 switch (mode) {
1004 case COMMAND_MODE:
1005 ret = wgetch(top.win);
1006 if (ret != ERR && ret != KEY_RESIZE) {
1007 if (command_pipe) {
1008 close(command_pipe);
1009 command_pipe = -1;
1010 }
1011 if (cmd_pid)
1012 kill(cmd_pid, SIGTERM);
1013 return -1;
1014 }
1015 break;
1016 case GETCH_MODE:
1017 ret = wgetch(top.win);
1018 if (ret != ERR && ret != KEY_RESIZE)
1019 return ret;
1020 break;
1021 case EXTERNAL_MODE:
1022 if (cmd_died) {
1023 cmd_died = 0;
1024 return 0;
1025 }
1026 }
1027 goto repeat;
1028 }
1029
1030 /*
1031 * read from command pipe and print data to bot window
1032 */
1033 static int send_output(void)
1034 {
1035 int ret;
1036
1037 if (command_pipe < 0)
1038 return 0;
1039 ret = mark_fd_nonblocking(command_pipe);
1040 if (ret < 0) {
1041 close(command_pipe);
1042 return ret;
1043 }
1044 if (do_select(COMMAND_MODE) >= 0)
1045 PARA_INFO_LOG("command complete");
1046 else
1047 PARA_NOTICE_LOG("command aborted");
1048 print_in_bar(COLOR_MSG, " ");
1049 return 1;
1050 }
1051
1052 static int client_cmd_cmdline(char *cmd)
1053 {
1054 int ret, fds[3] = {0, 1, 0};
1055 char *c = make_message(BINDIR "/para_client -- %s", cmd);
1056
1057 outputf(COLOR_COMMAND, "%s", c);
1058 print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1059 ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1060 free(c);
1061 if (ret < 0)
1062 return -1;
1063 command_pipe = fds[1];
1064 return send_output();
1065 }
1066
1067 /*
1068 * exec command and print output to bot win
1069 */
1070 static int display_cmd(char *cmd)
1071 {
1072 int fds[3] = {0, 1, 0};
1073
1074 print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1075 outputf(COLOR_COMMAND, "%s", cmd);
1076 if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1077 return -1;
1078 command_pipe = fds[1];
1079 return send_output();
1080 }
1081
1082 /*
1083 * shutdown curses and stat pipe before executing external commands
1084 */
1085 static int external_cmd(char *cmd)
1086 {
1087 int fds[3] = {-1, -1, -1};
1088
1089 if (cmd_pid)
1090 return -1;
1091 shutdown_curses();
1092 para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1093 cmd_died = 0;
1094 do_select(EXTERNAL_MODE);
1095 init_curses();
1096 return 0;
1097 }
1098
1099 static void print_scroll_msg(void)
1100 {
1101 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1102 int first_rbe = first_visible_rbe(&lines_total);
1103 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1104 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1105 }
1106
1107 static void com_scroll_top(void)
1108 {
1109 int i = RINGBUFFER_SIZE - 1;
1110 unsigned lines = 0;
1111
1112 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1113 i--;
1114 /* i is oldest entry */
1115 for (; lines < bot.lines && i >= 0; i--) {
1116 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1117 if (!rbe)
1118 break;
1119 lines += NUM_LINES(strlen(rbe->msg));
1120 }
1121 i++;
1122 if (lines > 0 && scroll_position != i) {
1123 scroll_position = i;
1124 redraw_bot_win();
1125 print_scroll_msg();
1126 return;
1127 }
1128 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1129 }
1130
1131 static void com_cancel_scrolling(void)
1132 {
1133
1134 if (scroll_position == 0) {
1135 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1136 return;
1137 }
1138 scroll_position = 0;
1139 redraw_bot_win();
1140 }
1141
1142 static void com_page_down(void)
1143 {
1144 unsigned lines = 0;
1145 int i = scroll_position;
1146 while (lines < bot.lines && --i > 0) {
1147 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1148 if (!rbe)
1149 break;
1150 lines += NUM_LINES(strlen(rbe->msg));
1151 }
1152 if (lines) {
1153 scroll_position = i;
1154 redraw_bot_win();
1155 print_scroll_msg();
1156 return;
1157 }
1158 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1159 }
1160
1161 static void com_page_up(void)
1162 {
1163 unsigned lines;
1164 int fvr = first_visible_rbe(&lines);
1165
1166 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1167 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1168 return;
1169 }
1170 scroll_position = fvr + 1;
1171 for (; scroll_position > 0; scroll_position--) {
1172 first_visible_rbe(&lines);
1173 if (lines == bot.lines)
1174 break;
1175 }
1176 redraw_bot_win();
1177 print_scroll_msg();
1178 }
1179
1180 static void com_scroll_down(void)
1181 {
1182 struct rb_entry *rbe;
1183 int rbe_lines;
1184
1185 if (!scroll_position) {
1186 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1187 return;
1188 }
1189 scroll_position--;
1190 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1191 rbe_lines = NUM_LINES(rbe->len);
1192 wscrl(bot.win, rbe_lines);
1193 wmove(bot.win, bot.lines - rbe_lines, 0);
1194 wattron(bot.win, COLOR_PAIR(rbe->color));
1195 waddstr(bot.win, rbe->msg);
1196 wrefresh(bot.win);
1197 print_scroll_msg();
1198 }
1199
1200 static void com_scroll_up(void)
1201 {
1202 struct rb_entry *rbe = NULL;
1203 unsigned lines;
1204 int i, first_rbe, num_scroll;
1205
1206 /* the entry that is going to vanish */
1207 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1208 if (!rbe)
1209 goto err_out;
1210 num_scroll = NUM_LINES(rbe->len);
1211 first_rbe = first_visible_rbe(&lines);
1212 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1213 goto err_out;
1214 scroll_position++;
1215 wscrl(bot.win, -num_scroll);
1216 i = draw_top_rbe(&lines);
1217 if (i < 0)
1218 goto err_out;
1219 while (i > 0 && lines < num_scroll) {
1220 int rbe_lines;
1221 rbe = ringbuffer_get(bot_win_rb, --i);
1222 if (!rbe)
1223 break;
1224 rbe_lines = NUM_LINES(rbe->len);
1225 lines += rbe_lines;
1226 // fprintf(stderr, "msg: %s\n", rbe->msg);
1227 wattron(bot.win, COLOR_PAIR(rbe->color));
1228 waddstr(bot.win, "\n");
1229 waddstr(bot.win, rbe->msg);
1230 if (!i)
1231 break;
1232 i--;
1233 }
1234 wrefresh(bot.win);
1235 print_scroll_msg();
1236 return;
1237 err_out:
1238 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1239 }
1240
1241 static void com_ll_decr(void)
1242 {
1243 if (loglevel <= LL_DEBUG) {
1244 print_in_bar(COLOR_ERRMSG,
1245 "loglevel already at maximal verbosity\n");
1246 return;
1247 }
1248 loglevel--;
1249 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1250 }
1251
1252 static void com_ll_incr(void)
1253 {
1254 if (loglevel >= LL_EMERG) {
1255 print_in_bar(COLOR_ERRMSG,
1256 "loglevel already at minimal verbosity\n");
1257 return;
1258 }
1259 loglevel++;
1260 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1261 }
1262
1263 /*
1264 * reread configuration, terminate on errors
1265 */
1266 static void com_reread_conf(void)
1267 {
1268 char *cf =configfile_exists();
1269 struct gui_cmdline_parser_params params = {
1270 .override = 1,
1271 .initialize = 1,
1272 .check_required = 0,
1273 .check_ambiguity = 0,
1274 .print_errors = 0,
1275 };
1276
1277 if (!cf) {
1278 PARA_WARNING_LOG("there is no configuration to read");
1279 return;
1280 }
1281 PARA_INFO_LOG("rereading command line options and config file");
1282 gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1283 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1284 PARA_EMERG_LOG("errors in config file");
1285 finish(EXIT_FAILURE);
1286 }
1287 PARA_NOTICE_LOG("config file reloaded");
1288 if (check_key_map_args() < 0)
1289 finish(EXIT_FAILURE);
1290 }
1291
1292 static void com_help(void)
1293 {
1294 int i;
1295
1296 for (i = 0; i < conf.key_map_given; ++i) {
1297 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1298 const char *handler_text = "???", *desc = NULL;
1299
1300 if (!split_key_map(tmp, &handler, &arg)) {
1301 free(tmp);
1302 return;
1303 }
1304 switch (*handler) {
1305 case 'i':
1306 handler_text = "internal";
1307 desc = command_list[find_cmd_byname(arg)].description;
1308 break;
1309 case 'x': handler_text = "external"; break;
1310 case 'd': handler_text = "display "; break;
1311 case 'p': handler_text = "para "; break;
1312 }
1313 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1314 strlen(arg) < 8? "\t" : "",
1315 desc? desc : "");
1316 free(tmp);
1317 }
1318 for (i = 0; command_list[i].handler; i++) {
1319 struct gui_command gc = command_list[i];
1320
1321 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1322 strlen(gc.name) < 8? "\t" : "",
1323 gc.description);
1324 }
1325 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1326 "for more info");
1327 }
1328
1329 static void com_shrink_top_win(void)
1330 {
1331 if (top.lines <= theme.top_lines_min) {
1332 PARA_WARNING_LOG("can not decrease top window");
1333 return;
1334 }
1335 init_wins(top.lines - 1);
1336 wclear(top.win);
1337 print_all_items();
1338 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1339 }
1340
1341 static void com_enlarge_top_win(void)
1342 {
1343 if (bot.lines < 3) {
1344 PARA_WARNING_LOG("can not increase 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, "increased top window");
1351 }
1352
1353 static void com_version(void)
1354 {
1355 print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1356 CODENAME "\"");
1357 }
1358
1359 __noreturn static void com_quit(void)
1360 {
1361 finish(0);
1362 }
1363
1364 static void com_refresh(void)
1365 {
1366 shutdown_curses();
1367 init_curses();
1368 }
1369
1370 static void change_theme(int next)
1371 {
1372 if (next)
1373 next_theme(&theme);
1374 else
1375 prev_theme(&theme);
1376 /* This seems to be needed twice, why? */
1377 com_refresh();
1378 com_refresh();
1379 PARA_NOTICE_LOG("new theme: %s", theme.name);
1380 }
1381
1382 static void com_next_theme(void)
1383 {
1384 change_theme(1);
1385 }
1386
1387 static void com_prev_theme(void)
1388 {
1389 change_theme(0);
1390 }
1391
1392
1393 static void handle_command(int c)
1394 {
1395 int i;
1396
1397 /* first check user's key bindings */
1398 for (i = 0; i < conf.key_map_given; ++i) {
1399 char *tmp, *handler, *arg;
1400
1401 tmp = para_strdup(conf.key_map_arg[i]);
1402 if (!split_key_map(tmp, &handler, &arg)) {
1403 free(tmp);
1404 return;
1405 }
1406 if (strcmp(tmp, km_keyname(c))) {
1407 free(tmp);
1408 continue;
1409 }
1410 if (*handler == 'd')
1411 display_cmd(arg);
1412 else if (*handler == 'x')
1413 external_cmd(arg);
1414 else if (*handler == 'p')
1415 client_cmd_cmdline(arg);
1416 else if (*handler == 'i') {
1417 int num = find_cmd_byname(arg);
1418 if (num >= 0)
1419 command_list[num].handler();
1420 }
1421 free(tmp);
1422 return;
1423 }
1424 /* not found, check internal key bindings */
1425 for (i = 0; command_list[i].handler; i++) {
1426 if (!strcmp(km_keyname(c), command_list[i].key)) {
1427 command_list[i].handler();
1428 return;
1429 }
1430 }
1431 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1432 km_keyname(c));
1433 }
1434
1435 int main(int argc, char *argv[])
1436 {
1437 int ret;
1438 char *cf;
1439
1440 _argc = argc;
1441 _argv = argv;
1442
1443 if (gui_cmdline_parser(argc, argv, &conf) != 0)
1444 exit(EXIT_FAILURE);
1445 HANDLE_VERSION_FLAG("gui", conf);
1446 cf = configfile_exists();
1447 if (!cf && conf.config_file_given) {
1448 fprintf(stderr, "can not read config file %s\n",
1449 conf.config_file_arg);
1450 exit(EXIT_FAILURE);
1451 }
1452 if (cf) {
1453 struct gui_cmdline_parser_params params = {
1454 .override = 0,
1455 .initialize = 0,
1456 .check_required = 0,
1457 .check_ambiguity = 0,
1458 .print_errors = 1,
1459 };
1460 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1461 exit(EXIT_FAILURE);
1462 }
1463 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1464 if (check_key_map_args() < 0) {
1465 fprintf(stderr, "invalid key map\n");
1466 exit(EXIT_FAILURE);
1467 }
1468 init_theme_or_die(conf.theme_arg, &theme);
1469 top.lines = theme.top_lines_default;
1470 setup_signal_handling();
1471 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1472 initscr(); /* needed only once, always successful */
1473 init_curses();
1474 print_welcome();
1475 for (;;) {
1476 print_status_bar();
1477 ret = do_select(GETCH_MODE);
1478 if (!ret)
1479 continue;
1480 print_in_bar(COLOR_MSG, " ");
1481 handle_command(ret);
1482 }
1483 }