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