1 /* Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 /** \file gui.c Curses-based interface for paraslash. */
17 #include "ringbuffer.h"
25 /** Array of error strings. */
28 static struct lls_parse_result *cmdline_lpr, *lpr;
30 #define CMD_PTR (lls_cmd(0, gui_suite))
31 #define OPT_RESULT(_name) (lls_opt_result(LSG_GUI_PARA_GUI_OPT_ ## _name, lpr))
32 #define OPT_GIVEN(_name) (lls_opt_given(OPT_RESULT(_name)))
33 #define OPT_STRING_VAL(_name) (lls_string_val(0, OPT_RESULT(_name)))
34 #define OPT_UINT32_VAL(_name) (lls_uint32_val(0, OPT_RESULT(_name)))
35 #define FOR_EACH_KEY_MAP(_i) for (_i = 0; _i < OPT_GIVEN(KEY_MAP); _i++)
37 static char *stat_content[NUM_STAT_ITEMS];
39 static struct gui_window {
42 } top, bot, sb, in, sep;
44 /** How many lines of output to remember. */
45 #define RINGBUFFER_SIZE 512
52 static struct ringbuffer *bot_win_rb;
54 static unsigned scroll_position;
55 static pid_t exec_pid;
56 static int exec_fds[2] = {-1, -1};
59 /** Type of the process currently being executed. */
61 EXEC_IDLE, /**< No process running. */
62 EXEC_DCMD, /**< para or display process running. */
63 EXEC_XCMD, /**< External process running. */
67 * Codes for various colors.
69 * Each status item has its own color pair. The ones defined here start at a
70 * higher number so that they do not overlap with these.
73 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
86 const char *description;
87 void (*handler)(void);
90 static struct gui_theme theme;
92 #define GUI_COMMANDS \
93 GUI_COMMAND(help, "?", "print help") \
94 GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
95 GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
96 GUI_COMMAND(reread_conf, "r", "reread configuration file") \
97 GUI_COMMAND(quit, "q", "exit para_gui") \
98 GUI_COMMAND(refresh, "^L", "redraw the screen") \
99 GUI_COMMAND(next_theme, ".", "switch to next theme") \
100 GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
101 GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
102 GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
103 GUI_COMMAND(version, "V", "show the para_gui version") \
104 GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
105 GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
106 GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
107 GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
108 GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
109 GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
111 /* declare command handlers */
112 #define GUI_COMMAND(_c, _k, _d) \
113 static void com_ ## _c(void);
118 /* define command array */
119 #define GUI_COMMAND(_c, _k, _d) \
124 .handler = com_ ## _c \
127 static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
138 struct timeval next_exec;
142 /** Stdout/stderr of the executing process is read in chunks of this size. */
143 #define COMMAND_BUF_SIZE 32768
147 char command_buf[2][COMMAND_BUF_SIZE]; /* stdout/stderr of command */
148 int cbo[2]; /* command buf offsets */
149 unsigned flags[2]; /* passed to for_each_line() */
152 static int find_cmd_byname(const char *name)
156 for (i = 0; command_list[i].handler; i++)
157 if (!strcmp(command_list[i].name, name))
163 * Even though ncurses provides getmaxx and getmaxy, these functions/macros are
164 * not described in the XSI Curses standard.
166 static int get_num_lines(struct gui_window *w)
169 __a_unused int cols; /* avoid "set but not used" warnings */
171 getmaxyx(w->win, lines, cols);
175 static int get_num_cols(struct gui_window *w)
177 __a_unused int lines; /* avoid "set but not used" warnings */
180 getmaxyx(w->win, lines, cols);
184 /** Number of lines of the window are occupied by an output line. */
185 #define NUM_LINES(len) (1 + (len) / get_num_cols(&bot))
187 /* isendwin() returns false before initscr() was called */
188 static bool curses_active(void)
190 return top.win && !isendwin();
193 /* taken from mutt */
194 static char *km_keyname(int c)
199 sprintf(buf, "<up>");
203 sprintf(buf, "<down>");
207 sprintf(buf, "<left>");
210 if (c == KEY_RIGHT) {
211 sprintf(buf, "<right>");
214 if (c == KEY_NPAGE) {
215 sprintf(buf, "<npage>");
218 if (c == KEY_PPAGE) {
219 sprintf(buf, "<ppage>");
223 sprintf(buf, "<home>");
227 sprintf(buf, "<end>");
230 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
235 buf[1] = (c + '@') & 0x7f;
238 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
239 (c >> 3) & 7, c & 7);
240 } else if (c >= KEY_F0 && c < KEY_F(256))
241 sprintf(buf, "<F%d>", c - KEY_F0);
243 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
245 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
249 /* Print given number of spaces to curses window. */
250 static void add_spaces(WINDOW *win, unsigned int num)
252 const char space[] = " ";
253 const unsigned sz = sizeof(space) - 1; /* number of spaces */
261 waddstr(win, space + sz - num);
266 * Print aligned string to curses window. This function always prints
269 static int align_str(WINDOW *win, const char *str, unsigned int len,
272 int ret, num; /* of spaces */
274 char *sstr; /* sanitized string */
278 ret = sanitize_str(str, len, &sstr, &width);
280 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
282 sstr = para_strdup(NULL);
284 assert(width <= len);
288 add_spaces(win, num);
289 } else if (align == RIGHT) {
290 add_spaces(win, num);
293 add_spaces(win, num / 2);
295 add_spaces(win, num - num / 2);
301 static void refresh_window(struct gui_window *gw)
303 gw->needs_update = true;
306 static bool window_update_needed(void)
308 return top.needs_update || bot.needs_update || sb.needs_update ||
309 in.needs_update || sep.needs_update;
312 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
317 if (!curses_active())
319 wattron(in.win, COLOR_PAIR(color));
321 xvasprintf(&msg, fmt, ap);
324 align_str(in.win, msg, get_num_cols(&in), LEFT);
329 static void print_status_bar(void)
333 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
335 align_str(sb.win, tmp, get_num_cols(&sb), CENTER);
340 * get the number of the oldest rbe that is (partially) visible. On return,
341 * lines contains the sum of the number of lines of all visible entries. If the
342 * first one is only partially visible, lines is greater than bot.lines.
344 static int first_visible_rbe(unsigned *lines)
346 int i, bot_lines = get_num_lines(&bot);
349 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
350 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
354 rbe_lines = NUM_LINES(rbe->len);
355 if (rbe_lines > bot_lines)
358 if (*lines >= bot_lines)
361 return RINGBUFFER_SIZE - 1;
365 returns number of first visible rbe, *lines is the number of lines drawn.
367 static int draw_top_rbe(unsigned *lines)
369 int bot_cols, bot_lines, ret, fvr = first_visible_rbe(lines);
370 struct rb_entry *rbe;
371 size_t bytes_to_skip, cells_to_skip, width;
375 wmove(bot.win, 0, 0);
376 rbe = ringbuffer_get(bot_win_rb, fvr);
379 getmaxyx(bot.win, bot_lines, bot_cols);
380 if (*lines > bot_lines) {
381 /* rbe is partially visible multi-line */
382 cells_to_skip = (*lines - bot_lines) * bot_cols;
383 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
386 ret = strwidth(rbe->msg + bytes_to_skip, &width);
393 wattron(bot.win, COLOR_PAIR(rbe->color));
394 waddstr(bot.win, rbe->msg + bytes_to_skip);
395 *lines = NUM_LINES(width);
399 static void redraw_bot_win(void)
402 int i, bot_lines = get_num_lines(&bot);
404 wmove(bot.win, 0, 0);
406 i = draw_top_rbe(&lines);
409 while (i > 0 && lines < bot_lines) {
410 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
413 waddstr(bot.win, "\n");
416 lines += NUM_LINES(rbe->len);
417 wattron(bot.win, COLOR_PAIR(rbe->color));
418 waddstr(bot.win, "\n");
419 waddstr(bot.win, rbe->msg);
422 refresh_window(&bot);
425 static void rb_add_entry(int color, char *msg)
427 struct rb_entry *old, *new;
431 if (strwidth(msg, &len) < 0)
433 new = para_malloc(sizeof(struct rb_entry));
437 old = ringbuffer_add(bot_win_rb, new);
442 if (scroll_position) {
443 /* discard current scrolling, like xterm does */
448 wattron(bot.win, COLOR_PAIR(color));
449 getyx(bot.win, y, x);
451 waddstr(bot.win, "\n");
452 waddstr(bot.win, msg);
455 /* Print formatted output to bot win and refresh. */
456 __printf_2_3 static void outputf(int color, const char *fmt,...)
461 if (!curses_active())
464 xvasprintf(&msg, fmt, ap);
466 rb_add_entry(color, msg);
467 refresh_window(&bot);
470 static int add_output_line(char *line, void *data)
472 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
474 if (!curses_active())
476 rb_add_entry(color, para_strdup(line));
480 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
487 if (curses_active()) {
488 int color = ll <= LL_NOTICE? COLOR_MSG : COLOR_ERRMSG;
490 unsigned bytes = xvasprintf(&msg, fmt, ap);
491 if (bytes > 0 && msg[bytes - 1] == '\n')
492 msg[bytes - 1] = '\0'; /* cut trailing newline */
493 rb_add_entry(color, msg);
494 refresh_window(&bot);
495 } else if (exec_pid <= 0) /* no external command running */
496 vfprintf(stderr, fmt, ap);
500 /** The log function of para_gui, always set to curses_log(). */
501 __printf_2_3 void (*para_log)(int, const char *, ...) = curses_log;
503 /* Call endwin() to reset the terminal into non-visual mode. */
504 static void shutdown_curses(void)
507 * If para_gui received a terminating signal in external mode, the
508 * terminal can be in an unusable state at this point because the child
509 * process might not have caught the signal. In this case endwin() has
510 * already been called and must not be called again. So we first return
511 * to program mode, then call endwin().
513 if (!curses_active())
518 /* Disable curses, print a message, kill running processes and exit. */
519 __noreturn __printf_2_3 static void die(int exit_code, const char *fmt, ...)
523 /* Kill every process in our process group. */
524 para_sigaction(SIGTERM, SIG_IGN);
526 /* Wait up to two seconds for child processes to die. */
528 while (waitpid(0, NULL, 0) >= 0)
531 /* mousemask() exists only in ncurses */
532 #ifdef NCURSES_MOUSE_VERSION
533 mousemask(~(mmask_t)0, NULL); /* Avoid bad terminal state with xterm. */
537 vfprintf(stderr, fmt, argp);
542 /* Print stat item #i to curses window. */
543 static void print_stat_item(int i)
546 struct stat_item_data d = theme.data[i];
547 char *c = stat_content[i];
548 int top_lines = get_num_lines(&top);
550 if (!curses_active() || !d.len || !c)
552 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
553 wmove(top.win, d.y * top_lines / 100, d.x * COLS / 100);
554 wattron(top.win, COLOR_PAIR(i + 1));
555 align_str(top.win, tmp, d.len * COLS / 100, d.align);
557 refresh_window(&top);
560 static int update_item(int item_num, char *buf)
562 char **c = stat_content + item_num;
569 *c = para_strdup("(artist tag not set)");
572 *c = para_strdup("(title tag not set)");
575 *c = para_strdup("????");
578 *c = para_strdup("(album tag not set)");
581 *c = para_strdup("(comment tag not set)");
585 *c = para_strdup(buf);
587 print_stat_item(item_num);
591 static void print_all_items(void)
595 if (!curses_active())
597 FOR_EACH_STATUS_ITEM(i)
601 static void clear_all_items(void)
605 FOR_EACH_STATUS_ITEM(i) {
606 free(stat_content[i]);
607 stat_content[i] = para_strdup("");
611 static void status_pre_select(struct sched *s, void *context)
613 struct status_task *st = context;
616 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
617 if (task_get_notification(st->task) < 0)
618 return sched_min_delay(s);
620 sched_request_barrier_or_min_delay(&st->next_exec, s);
623 static int status_post_select(struct sched *s, void *context)
625 struct status_task *st = context;
629 ret = task_get_notification(st->task);
630 if (ret == -E_GUI_SIGCHLD && st->pid > 0) {
632 if (waitpid(st->pid, &exit_status, WNOHANG) == st->pid) {
634 PARA_ERROR_LOG("stat command exit status: %d",
639 int fds[3] = {0, 1, 0};
642 /* Avoid busy loop */
643 if (tv_diff(&st->next_exec, now, NULL) > 0)
645 st->next_exec.tv_sec = now->tv_sec + 2;
646 ret = para_exec_cmdline_pid(&st->pid,
647 OPT_STRING_VAL(STAT_CMD), fds);
650 ret = mark_fd_nonblocking(fds[1]);
659 if (st->loaded >= st->bufsize) {
660 if (st->bufsize > 1000 * 1000) {
664 st->bufsize += st->bufsize + 1000;
665 st->buf = para_realloc(st->buf, st->bufsize);
667 assert(st->loaded < st->bufsize);
668 ret = read_nonblock(st->fd, st->buf + st->loaded,
669 st->bufsize - st->loaded, &s->rfds, &sz);
671 ret2 = for_each_stat_item(st->buf, st->loaded, update_item);
672 if (ret < 0 || ret2 < 0) {
674 PARA_NOTICE_LOG("closing stat pipe: %s\n",
675 para_strerror(ret < 0? -ret : -ret2));
679 free(stat_content[SI_basename]);
680 stat_content[SI_basename] =
681 para_strdup("stat command terminated!?");
685 sz = ret2; /* what is left */
686 if (sz > 0 && sz < st->loaded)
687 memmove(st->buf, st->buf + st->loaded - sz, sz);
692 /* Initialize all windows. */
693 static void init_wins(int top_lines)
695 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
696 in_y = LINES - 1, sep_y = top_lines;
697 int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
700 assume_default_colors(theme.dflt.fg, theme.dflt.bg);
702 wresize(top.win, top_lines, COLS);
703 mvwin(top.win, top_y, 0);
705 wresize(sb.win, sb_lines, COLS);
706 mvwin(sb.win, sb_y, 0);
708 wresize(sep.win, sep_lines, COLS);
709 mvwin(sep.win, sep_y, 0);
711 wresize(bot.win, bot_lines, COLS);
712 mvwin(bot.win, bot_y, 0);
714 wresize(in.win, in_lines, COLS);
715 mvwin(in.win, in_y, 0);
717 sep.win = newwin(sep_lines, COLS, sep_y, 0);
718 top.win = newwin(top_lines, COLS, top_y, 0);
719 bot.win = newwin(bot_lines, COLS, bot_y, 0);
720 sb.win = newwin(sb_lines, COLS, sb_y, 0);
721 in.win = newwin(in_lines, COLS, in_y, 0);
722 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
723 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
727 scrollok(bot.win, 1);
728 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
729 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
730 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
731 wattron(top.win, COLOR_PAIR(COLOR_TOP));
742 wmove(sep.win, 0, 0);
743 whline(sep.win, theme.sep_char, COLS);
747 wnoutrefresh(top.win);
748 wnoutrefresh(bot.win);
750 wnoutrefresh(sb.win);
751 wnoutrefresh(in.win);
752 wnoutrefresh(sep.win);
756 static void init_pair_or_die(short pair, short f, short b)
758 if (init_pair(pair, f, b) == ERR)
759 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
762 static void init_colors_or_die(void)
767 die(EXIT_FAILURE, "fatal: No color term\n");
768 if (start_color() == ERR)
769 die(EXIT_FAILURE, "fatal: failed to start colors\n");
770 FOR_EACH_STATUS_ITEM(i)
771 if (theme.data[i].len)
772 init_pair_or_die(i + 1, theme.data[i].color.fg,
773 theme.data[i].color.bg);
774 init_pair_or_die(COLOR_STATUSBAR, theme.sb.fg, theme.sb.bg);
775 init_pair_or_die(COLOR_COMMAND, theme.cmd.fg, theme.cmd.bg);
776 init_pair_or_die(COLOR_OUTPUT, theme.output.fg, theme.output.bg);
777 init_pair_or_die(COLOR_MSG, theme.msg.fg, theme.msg.bg);
778 init_pair_or_die(COLOR_ERRMSG, theme.err_msg.fg, theme.err_msg.bg);
779 init_pair_or_die(COLOR_SEPARATOR, theme.sep.fg, theme.sep.bg);
780 init_pair_or_die(COLOR_TOP, theme.dflt.fg, theme.dflt.bg);
781 init_pair_or_die(COLOR_BOT, theme.dflt.fg, theme.dflt.bg);
784 /* (Re-)initialize the curses library. */
785 static void init_curses(void)
789 if (refresh() == ERR) /* refresh is really needed */
790 die(EXIT_FAILURE, "refresh() failed\n");
791 if (LINES < theme.lines_min || COLS < theme.cols_min)
792 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
793 " (need at least %dx%d)\n", COLS, LINES,
794 theme.cols_min, theme.lines_min);
795 curs_set(0); /* make cursor invisible, ignore errors */
796 nonl(); /* do not NL->CR/NL on output, always returns OK */
797 /* don't echo input */
799 die(EXIT_FAILURE, "fatal: noecho() failed\n");
800 /* take input chars one at a time, no wait for \n */
802 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
803 init_colors_or_die();
804 clear(); /* ignore non-fatal errors */
805 init_wins(theme.top_lines_default);
806 // noecho(); /* don't echo input */
810 * This sucker modifies its first argument. *handler and *arg are
811 * pointers to 0-terminated strings (inside line). Crap.
813 static int split_key_map(char *line, char **handler, char **arg)
815 if (!(*handler = strchr(line + 1, ':')))
819 if (!(*arg = strchr(*handler, ':')))
828 static void check_key_map_args_or_die(void)
832 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
834 FOR_EACH_KEY_MAP(i) {
838 tmp = para_strdup(lls_string_val(i, lor));
839 if (!split_key_map(tmp, &handler, &arg))
841 if (strlen(handler) != 1)
843 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
848 if (find_cmd_byname(arg) < 0)
851 if (i != OPT_GIVEN(KEY_MAP))
852 die(EXIT_FAILURE, "invalid key map: %s\n",
853 lls_string_val(i, lor));
857 static void parse_config_file_or_die(bool reload)
860 char *cf = NULL, *errctx = NULL;
865 struct lls_parse_result *cf_lpr, *merged_lpr;
867 if (OPT_GIVEN(CONFIG_FILE))
868 cf = para_strdup(OPT_STRING_VAL(CONFIG_FILE));
870 char *home = para_homedir();
871 cf = make_message("%s/.paraslash/gui.conf", home);
874 ret = mmap_full_file(cf, O_RDONLY, &map, &sz, NULL);
876 if (ret != -E_EMPTY && ret != -ERRNO_TO_PARA_ERROR(ENOENT))
878 if (ret == -ERRNO_TO_PARA_ERROR(ENOENT) && OPT_GIVEN(CONFIG_FILE))
884 ret = lls(lls_convert_config(map, sz, NULL, &cf_argv, &errctx));
885 para_munmap(map, sz);
889 ret = lls(lls_parse(cf_argc, cf_argv, CMD_PTR, &cf_lpr, &errctx));
890 lls_free_argv(cf_argv);
893 if (reload) /* config file overrides command line */
894 ret = lls(lls_merge(cf_lpr, cmdline_lpr, CMD_PTR, &merged_lpr,
896 else /* command line options override config file options */
897 ret = lls(lls_merge(cmdline_lpr, cf_lpr, CMD_PTR, &merged_lpr,
899 lls_free_parse_result(cf_lpr, CMD_PTR);
902 if (lpr != cmdline_lpr)
903 lls_free_parse_result(lpr, CMD_PTR);
906 loglevel = OPT_UINT32_VAL(LOGLEVEL);
907 check_key_map_args_or_die();
908 theme_init(OPT_STRING_VAL(THEME), &theme);
913 PARA_ERROR_LOG("%s\n", errctx);
915 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
920 /* Reread configuration, terminate on errors. */
921 static void reread_conf(void)
924 * If the reload of the config file fails, we are about to exit. In
925 * this case we print the error message to stderr rather than to the
926 * curses window. So we have to shutdown curses first.
929 parse_config_file_or_die(true);
931 print_in_bar(COLOR_MSG, "config file reloaded\n");
934 /* React to various signal-related events. */
935 static int signal_post_select(struct sched *s, __a_unused void *context)
937 int ret = para_next_signal(&s->rfds);
943 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
945 PARA_NOTICE_LOG("got SIGWINCH\n");
946 if (curses_active()) {
955 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
959 task_notify_all(s, E_GUI_SIGCHLD);
965 static enum exec_status exec_status(void)
967 if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
974 static void exec_pre_select(struct sched *s, void *context)
976 struct exec_task *et = context;
977 if (exec_fds[0] >= 0)
978 para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
979 if (exec_fds[1] >= 0)
980 para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
981 if (task_get_notification(et->task) < 0)
985 static int exec_post_select(struct sched *s, void *context)
987 struct exec_task *ct = context;
990 ret = task_get_notification(ct->task);
991 if (ret == -E_GUI_SIGCHLD && exec_pid > 0) {
993 if (waitpid(exec_pid, &exit_status, WNOHANG) == exec_pid) {
996 PARA_INFO_LOG("command exit status: %d", exit_status);
997 print_in_bar(COLOR_MSG, " ");
1000 for (i = 0; i < 2; i++) {
1002 if (exec_fds[i] < 0)
1004 ret = read_nonblock(exec_fds[i],
1005 ct->command_buf[i] + ct->cbo[i],
1006 COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
1009 ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
1010 ct->cbo[i], add_output_line, &i);
1011 if (sz != ct->cbo[i]) { /* at least one line found */
1012 refresh_window(&bot);
1015 if (ret < 0 || exec_pid == 0) {
1017 PARA_NOTICE_LOG("closing command fd %d: %s",
1018 i, para_strerror(-ret));
1023 if (exec_fds[!i] < 0) /* both fds closed */
1026 if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
1027 PARA_NOTICE_LOG("discarding overlong line");
1029 ct->flags[i] = FELF_DISCARD_FIRST;
1035 static void input_pre_select(struct sched *s, __a_unused void *context)
1037 if (exec_status() != EXEC_XCMD)
1038 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
1039 if (window_update_needed())
1043 /* Read from command pipe and print data to bot window. */
1044 static void exec_and_display(const char *file_and_args)
1046 int ret, fds[3] = {0, 1, 1};
1048 outputf(COLOR_COMMAND, "%s", file_and_args);
1049 ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1052 ret = mark_fd_nonblocking(fds[1]);
1055 ret = mark_fd_nonblocking(fds[2]);
1058 exec_fds[0] = fds[1];
1059 exec_fds[1] = fds[2];
1060 print_in_bar(COLOR_MSG, "hit any key to abort\n");
1063 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1068 static void exec_para(const char *args)
1070 char *file_and_args;
1072 file_and_args = make_message(BINDIR "/para_client -- %s", args);
1073 exec_and_display(file_and_args);
1074 free(file_and_args);
1077 /* Shutdown curses and stat pipe before executing external commands. */
1078 static void exec_external(char *file_and_args)
1080 int fds[3] = {-1, -1, -1};
1085 para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1088 static void handle_command(int c)
1091 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
1093 /* first check user-defined key bindings */
1094 FOR_EACH_KEY_MAP(i) {
1095 char *tmp, *handler, *arg;
1097 tmp = para_strdup(lls_string_val(i, lor));
1098 if (!split_key_map(tmp, &handler, &arg)) {
1102 if (strcmp(tmp, km_keyname(c))) {
1106 if (*handler == 'd')
1107 exec_and_display(arg);
1108 else if (*handler == 'x')
1110 else if (*handler == 'p')
1112 else if (*handler == 'i') {
1113 int num = find_cmd_byname(arg);
1115 command_list[num].handler();
1120 /* not found, check internal key bindings */
1121 for (i = 0; command_list[i].handler; i++) {
1122 if (!strcmp(km_keyname(c), command_list[i].key)) {
1123 command_list[i].handler();
1127 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1131 static int input_post_select(__a_unused struct sched *s,
1132 __a_unused void *context)
1135 enum exec_status exs = exec_status();
1137 if (exs == EXEC_XCMD)
1139 if (window_update_needed()) {
1140 if (top.needs_update)
1141 assert(wnoutrefresh(top.win) == OK);
1142 if (bot.needs_update)
1143 assert(wnoutrefresh(bot.win) == OK);
1144 if (sep.needs_update)
1145 assert(wnoutrefresh(sep.win) == OK);
1146 if (sb.needs_update)
1147 assert(wnoutrefresh(sb.win) == OK);
1148 if (in.needs_update)
1149 assert(wnoutrefresh(in.win) == OK);
1151 top.needs_update = bot.needs_update = sb.needs_update =
1152 in.needs_update = sep.needs_update = false;
1154 ret = wgetch(top.win);
1157 if (ret == KEY_RESIZE) /* already handled in signal_post_select() */
1159 if (exs == EXEC_IDLE)
1160 handle_command(ret);
1161 else if (exec_pid > 0)
1162 kill(exec_pid, SIGTERM);
1166 static void print_scroll_msg(void)
1168 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1169 int first_rbe = first_visible_rbe(&lines_total);
1171 print_in_bar(COLOR_MSG, "scrolled view: %u-%u/%u\n", filled - first_rbe,
1172 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1175 static void com_scroll_top(void)
1177 int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
1180 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1182 /* i is oldest entry */
1183 for (; lines < bot_lines && i >= 0; i--) {
1184 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1187 lines += NUM_LINES(rbe->len);
1190 if (lines > 0 && scroll_position != i) {
1191 scroll_position = i;
1196 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1199 static void com_cancel_scroll(void)
1202 if (scroll_position == 0) {
1203 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1206 scroll_position = 0;
1210 static void com_page_down(void)
1213 int i = scroll_position, bot_lines = get_num_lines(&bot);
1215 while (lines < bot_lines && --i > 0) {
1216 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1219 lines += NUM_LINES(rbe->len);
1222 scroll_position = i;
1227 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1230 static void com_page_up(void)
1233 int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
1235 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1236 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1239 scroll_position = fvr + 1;
1240 for (; scroll_position > 0; scroll_position--) {
1241 first_visible_rbe(&lines);
1242 if (lines == bot_lines)
1249 static void com_scroll_down(void)
1251 struct rb_entry *rbe;
1252 int rbe_lines, bot_lines = get_num_lines(&bot);
1254 if (!scroll_position) {
1255 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1259 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1260 rbe_lines = NUM_LINES(rbe->len);
1261 wscrl(bot.win, rbe_lines);
1262 wmove(bot.win, bot_lines - rbe_lines, 0);
1263 wattron(bot.win, COLOR_PAIR(rbe->color));
1264 waddstr(bot.win, rbe->msg);
1265 refresh_window(&bot);
1269 static void com_scroll_up(void)
1271 struct rb_entry *rbe = NULL;
1273 int i, first_rbe, num_scroll;
1275 /* the entry that is going to vanish */
1276 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1279 num_scroll = NUM_LINES(rbe->len);
1280 first_rbe = first_visible_rbe(&lines);
1281 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1284 wscrl(bot.win, -num_scroll);
1285 i = draw_top_rbe(&lines);
1288 while (i > 0 && lines < num_scroll) {
1290 rbe = ringbuffer_get(bot_win_rb, --i);
1293 rbe_lines = NUM_LINES(rbe->len);
1295 wattron(bot.win, COLOR_PAIR(rbe->color));
1296 waddstr(bot.win, "\n");
1297 waddstr(bot.win, rbe->msg);
1302 refresh_window(&bot);
1306 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1309 static void com_ll_decr(void)
1311 if (loglevel <= LL_DEBUG) {
1312 print_in_bar(COLOR_ERRMSG,
1313 "loglevel already at maximal verbosity\n");
1317 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1320 static void com_ll_incr(void)
1322 if (loglevel >= LL_EMERG) {
1323 print_in_bar(COLOR_ERRMSG,
1324 "loglevel already at minimal verbosity\n");
1328 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1331 static void com_reread_conf(void)
1336 static void com_help(void)
1339 const struct lls_opt_result *lor = OPT_RESULT(KEY_MAP);
1341 FOR_EACH_KEY_MAP(i) {
1342 char *handler, *arg, *tmp = para_strdup(lls_string_val(i, lor));
1343 const char *handler_text = "???", *desc = NULL;
1345 if (!split_key_map(tmp, &handler, &arg)) {
1351 handler_text = "internal";
1352 desc = command_list[find_cmd_byname(arg)].description;
1354 case 'x': handler_text = "external"; break;
1355 case 'd': handler_text = "display "; break;
1356 case 'p': handler_text = "para "; break;
1358 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1359 strlen(arg) < 8? "\t" : "",
1363 for (i = 0; command_list[i].handler; i++) {
1364 struct gui_command gc = command_list[i];
1366 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1367 strlen(gc.name) < 8? "\t" : "",
1370 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1374 static void com_shrink_top_win(void)
1376 int top_lines = get_num_lines(&top);
1378 if (top_lines <= theme.top_lines_min) {
1379 PARA_WARNING_LOG("can not decrease top window\n");
1382 init_wins(top_lines - 1);
1383 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1386 static void com_enlarge_top_win(void)
1388 int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
1390 if (bot_lines < 3) {
1391 PARA_WARNING_LOG("can not increase top window\n");
1394 init_wins(top_lines + 1);
1395 print_in_bar(COLOR_MSG, "increased top window");
1398 static void com_version(void)
1400 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1403 __noreturn static void com_quit(void)
1405 die(EXIT_SUCCESS, "%s", "");
1408 static void com_refresh(void)
1414 static void com_next_theme(void)
1420 static void com_prev_theme(void)
1426 static int setup_tasks_and_schedule(void)
1429 struct exec_task exec_task = {.task = NULL};
1430 struct status_task status_task = {.fd = -1};
1431 struct input_task input_task = {.task = NULL};
1432 struct signal_task *signal_task;
1433 struct sched sched = {.default_timeout = {.tv_sec = 1}};
1435 exec_task.task = task_register(&(struct task_info) {
1437 .pre_select = exec_pre_select,
1438 .post_select = exec_post_select,
1439 .context = &exec_task,
1442 status_task.task = task_register(&(struct task_info) {
1444 .pre_select = status_pre_select,
1445 .post_select = status_post_select,
1446 .context = &status_task,
1449 input_task.task = task_register(&(struct task_info) {
1451 .pre_select = input_pre_select,
1452 .post_select = input_post_select,
1453 .context = &input_task,
1456 signal_task = signal_init_or_die();
1457 para_install_sighandler(SIGINT);
1458 para_install_sighandler(SIGTERM);
1459 para_install_sighandler(SIGCHLD);
1460 para_install_sighandler(SIGUSR1);
1461 para_install_sighandler(SIGWINCH);
1462 signal_task->task = task_register(&(struct task_info) {
1464 .pre_select = signal_pre_select,
1465 .post_select = signal_post_select,
1466 .context = signal_task,
1468 ret = schedule(&sched);
1469 sched_shutdown(&sched);
1470 signal_shutdown(signal_task);
1474 static void handle_help_flags(void)
1478 if (OPT_GIVEN(DETAILED_HELP))
1479 help = lls_long_help(CMD_PTR);
1480 else if (OPT_GIVEN(HELP))
1481 help = lls_short_help(CMD_PTR);
1484 printf("%s\n", help);
1490 * The main function of para_gui.
1492 * \param argc Usual argument count.
1493 * \param argv Usual argument vector.
1495 * After initialization para_gui registers the following tasks to the paraslash
1496 * scheduler: status, exec, signal, input.
1498 * The status task executes the para_audioc stat command to obtain the status
1499 * of para_server and para_audiod, and displays this information in the top
1500 * window of para_gui.
1502 * The exec task is responsible for printing the output of the currently
1503 * running executable to the bottom window.
1505 * The signal task performs various actions according to signals received. For
1506 * example, it reloads the configuration file on SIGUSR1, and it shuts down the
1507 * curses system on SIGTERM to restore the terminal settings before exit.
1509 * The input task reads single key strokes from stdin. For each key pressed, it
1510 * executes the command handler associated with this key.
1512 * \return \p EXIT_SUCCESS or \p EXIT_FAILURE.
1514 int main(int argc, char *argv[])
1519 ret = lls(lls_parse(argc, argv, CMD_PTR, &cmdline_lpr, &errctx));
1523 loglevel = OPT_UINT32_VAL(LOGLEVEL);
1524 version_handle_flag("gui", OPT_GIVEN(VERSION));
1525 handle_help_flags();
1526 parse_config_file_or_die(false);
1527 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1528 setlocale(LC_CTYPE, "");
1529 initscr(); /* needed only once, always successful */
1531 ret = setup_tasks_and_schedule();
1533 lls_free_parse_result(lpr, CMD_PTR);
1534 if (lpr != cmdline_lpr)
1535 lls_free_parse_result(cmdline_lpr, CMD_PTR);
1538 PARA_ERROR_LOG("%s\n", errctx);
1540 PARA_EMERG_LOG("%s\n", para_strerror(-ret));
1542 return ret < 0? EXIT_FAILURE : EXIT_SUCCESS;