2 * Copyright (C) 1998 Andre Noll <maan@tuebingen.mpg.de>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file gui.c Curses-based interface for paraslash. */
11 #include <sys/types.h>
16 #include "gui.cmdline.h"
20 #include "ringbuffer.h"
29 /** define the array of error lists needed by para_gui */
31 static char *stat_content[NUM_STAT_ITEMS];
33 static struct gui_window {
36 } top, bot, sb, in, sep;
38 /** How many lines of output to remember. */
39 #define RINGBUFFER_SIZE 512
46 static struct ringbuffer *bot_win_rb;
48 static unsigned scroll_position;
50 static pid_t exec_pid;
52 static int exec_fds[2] = {-1, -1};
53 static struct gui_args_info conf;
56 /** Type of the process currently being executed. */
58 EXEC_IDLE, /**< No process running. */
59 EXEC_DCMD, /**< para or display process running. */
60 EXEC_XCMD, /**< External process running. */
64 * Codes for various colors.
66 * Each status item has its own color pair. The ones defined here start at a
67 * higher number so that they do not overlap with these.
70 COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
83 const char *description;
84 void (*handler)(void);
87 static struct gui_theme theme;
89 #define GUI_COMMANDS \
90 GUI_COMMAND(help, "?", "print help") \
91 GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
92 GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
93 GUI_COMMAND(reread_conf, "r", "reread configuration file") \
94 GUI_COMMAND(quit, "q", "exit para_gui") \
95 GUI_COMMAND(refresh, "^L", "redraw the screen") \
96 GUI_COMMAND(next_theme, ".", "switch to next theme") \
97 GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
98 GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
99 GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
100 GUI_COMMAND(version, "V", "show the para_gui version") \
101 GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
102 GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
103 GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
104 GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
105 GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
106 GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
108 /* declare command handlers */
109 #define GUI_COMMAND(_c, _k, _d) \
110 static void com_ ## _c(void);
115 /* define command array */
116 #define GUI_COMMAND(_c, _k, _d) \
121 .handler = com_ ## _c \
124 static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
135 struct timeval next_exec;
139 /** Stdout/stderr of the executing process is read in chunks of this size. */
140 #define COMMAND_BUF_SIZE 32768
144 char command_buf[2][COMMAND_BUF_SIZE]; /* stdout/stderr of command */
145 int cbo[2]; /* command buf offsets */
146 unsigned flags[2]; /* passed to for_each_line() */
149 static int find_cmd_byname(char *name)
153 for (i = 0; command_list[i].handler; i++)
154 if (!strcmp(command_list[i].name, name))
160 * Even though ncurses provides getmaxx and getmaxy, these functions/macros are
161 * not described in the XSI Curses standard.
163 static int get_num_lines(struct gui_window *w)
166 __a_unused int cols; /* avoid "set but not used" warnings */
168 getmaxyx(w->win, lines, cols);
172 static int get_num_cols(struct gui_window *w)
174 __a_unused int lines; /* avoid "set but not used" warnings */
177 getmaxyx(w->win, lines, cols);
181 /** Number of lines of the window are occupied by an output line. */
182 #define NUM_LINES(len) (1 + (len) / get_num_cols(&bot))
184 /* isendwin() returns false before initscr() was called */
185 static bool curses_active(void)
187 return top.win && !isendwin();
190 /* taken from mutt */
191 static char *km_keyname(int c)
196 sprintf(buf, "<up>");
200 sprintf(buf, "<down>");
204 sprintf(buf, "<left>");
207 if (c == KEY_RIGHT) {
208 sprintf(buf, "<right>");
211 if (c == KEY_NPAGE) {
212 sprintf(buf, "<npage>");
215 if (c == KEY_PPAGE) {
216 sprintf(buf, "<ppage>");
220 sprintf(buf, "<home>");
224 sprintf(buf, "<end>");
227 if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
232 buf[1] = (c + '@') & 0x7f;
235 snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
236 (c >> 3) & 7, c & 7);
237 } else if (c >= KEY_F0 && c < KEY_F(256))
238 sprintf(buf, "<F%d>", c - KEY_F0);
240 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
242 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
246 /* Print given number of spaces to curses window. */
247 static void add_spaces(WINDOW* win, unsigned int num)
249 const char space[] = " ";
250 const unsigned sz = sizeof(space) - 1; /* number of spaces */
258 waddstr(win, space + sz - num);
263 * print aligned string to curses window. This function always prints
266 static int align_str(WINDOW* win, const char *str, unsigned int len,
269 int ret, num; /* of spaces */
271 char *sstr; /* sanitized string */
275 ret = sanitize_str(str, len, &sstr, &width);
277 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
279 sstr = para_strdup(NULL);
281 assert(width <= len);
285 add_spaces(win, num);
286 } else if (align == RIGHT) {
287 add_spaces(win, num);
290 add_spaces(win, num / 2);
292 add_spaces(win, num - num / 2);
298 static void refresh_window(struct gui_window *gw)
300 gw->needs_update = true;
303 static bool window_update_needed(void)
305 return top.needs_update || bot.needs_update || sb.needs_update ||
306 in.needs_update || sep.needs_update;
309 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
314 if (!curses_active())
316 wattron(in.win, COLOR_PAIR(color));
318 xvasprintf(&msg, fmt, ap);
321 align_str(in.win, msg, get_num_cols(&in), LEFT);
326 static void print_status_bar(void)
330 tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
332 align_str(sb.win, tmp, get_num_cols(&sb), CENTER);
337 * get the number of the oldest rbe that is (partially) visible. On return,
338 * lines contains the sum of the number of lines of all visible entries. If the
339 * first one is only partially visible, lines is greater than bot.lines.
341 static int first_visible_rbe(unsigned *lines)
343 int i, bot_lines = get_num_lines(&bot);
346 for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
347 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
351 rbe_lines = NUM_LINES(rbe->len);
352 if (rbe_lines > bot_lines)
355 if (*lines >= bot_lines)
358 return RINGBUFFER_SIZE - 1;
362 returns number of first visible rbe, *lines is the number of lines drawn.
364 static int draw_top_rbe(unsigned *lines)
366 int bot_cols, bot_lines, ret, fvr = first_visible_rbe(lines);
367 struct rb_entry *rbe;
368 size_t bytes_to_skip, cells_to_skip, width;
372 wmove(bot.win, 0, 0);
373 rbe = ringbuffer_get(bot_win_rb, fvr);
376 getmaxyx(bot.win, bot_lines, bot_cols);
377 if (*lines > bot_lines) {
378 /* rbe is partially visible multi-line */
379 cells_to_skip = (*lines - bot_lines) * bot_cols;
380 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
383 ret = strwidth(rbe->msg + bytes_to_skip, &width);
390 wattron(bot.win, COLOR_PAIR(rbe->color));
391 waddstr(bot.win, rbe->msg + bytes_to_skip);
392 *lines = NUM_LINES(width);
396 static void redraw_bot_win(void)
399 int i, bot_lines = get_num_lines(&bot);
401 wmove(bot.win, 0, 0);
403 i = draw_top_rbe(&lines);
406 while (i > 0 && lines < bot_lines) {
407 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
410 waddstr(bot.win, "\n");
413 lines += NUM_LINES(rbe->len);
414 wattron(bot.win, COLOR_PAIR(rbe->color));
415 waddstr(bot.win, "\n");
416 waddstr(bot.win, rbe->msg);
419 refresh_window(&bot);
422 static void rb_add_entry(int color, char *msg)
424 struct rb_entry *old, *new;
428 if (strwidth(msg, &len) < 0)
430 new = para_malloc(sizeof(struct rb_entry));
434 old = ringbuffer_add(bot_win_rb, new);
439 if (scroll_position) {
440 /* discard current scrolling, like xterm does */
445 wattron(bot.win, COLOR_PAIR(color));
446 getyx(bot.win, y, x);
448 waddstr(bot.win, "\n");
449 waddstr(bot.win, msg);
453 * print formated output to bot win and refresh
455 __printf_2_3 static void outputf(int color, const char* fmt,...)
460 if (!curses_active())
463 xvasprintf(&msg, fmt, ap);
465 rb_add_entry(color, msg);
466 refresh_window(&bot);
469 static int add_output_line(char *line, void *data)
471 int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
473 if (!curses_active())
475 rb_add_entry(color, para_strdup(line));
479 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
486 if (curses_active()) {
487 int color = ll <= LL_NOTICE? COLOR_MSG : COLOR_ERRMSG;
489 unsigned bytes = xvasprintf(&msg, fmt, ap);
490 if (bytes > 0 && msg[bytes - 1] == '\n')
491 msg[bytes - 1] = '\0'; /* cut trailing newline */
492 rb_add_entry(color, msg);
493 refresh_window(&bot);
494 } else if (exec_pid <= 0) /* no external command running */
495 vfprintf(stderr, fmt, ap);
498 /** The log function of para_gui, always set to curses_log(). */
499 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
501 static void shutdown_curses(void)
507 /* disable curses, print a message, kill running processes and exit */
508 __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
514 vfprintf(stderr, fmt, argp);
516 /* kill every process in the process group and exit */
517 para_sigaction(SIGTERM, SIG_IGN);
523 * Print stat item #i to curses window
525 static void print_stat_item(int i)
528 struct stat_item_data d = theme.data[i];
529 char *c = stat_content[i];
530 int top_lines = get_num_lines(&top);
532 if (!curses_active() || !d.len || !c)
534 tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
535 wmove(top.win, d.y * top_lines / 100, d.x * COLS / 100);
536 wattron(top.win, COLOR_PAIR(i + 1));
537 align_str(top.win, tmp, d.len * COLS / 100, d.align);
539 refresh_window(&top);
542 static int update_item(int item_num, char *buf)
544 char **c = stat_content + item_num;
551 *c = para_strdup("(artist tag not set)");
554 *c = para_strdup("(title tag not set)");
557 *c = para_strdup("????");
560 *c = para_strdup("(album tag not set)");
563 *c = para_strdup("(comment tag not set)");
567 *c = para_strdup(buf);
569 print_stat_item(item_num);
573 static void print_all_items(void)
577 if (!curses_active())
579 FOR_EACH_STATUS_ITEM(i)
583 static void clear_all_items(void)
587 FOR_EACH_STATUS_ITEM(i) {
588 free(stat_content[i]);
589 stat_content[i] = para_strdup("");
593 static void status_pre_select(struct sched *s, void *context)
595 struct status_task *st = context;
598 para_fd_set(st->fd, &s->rfds, &s->max_fileno);
599 if (task_get_notification(st->task) < 0)
600 return sched_min_delay(s);
602 sched_request_barrier_or_min_delay(&st->next_exec, s);
605 static int status_post_select(struct sched *s, void *context)
607 struct status_task *st = context;
611 ret = task_get_notification(st->task);
612 if (ret == -E_GUI_SIGCHLD && st->pid > 0) {
614 if (waitpid(st->pid, &exit_status, WNOHANG) == st->pid) {
616 PARA_ERROR_LOG("stat command exit status: %d",
621 int fds[3] = {0, 1, 0};
624 /* Avoid busy loop */
625 if (tv_diff(&st->next_exec, now, NULL) > 0)
627 st->next_exec.tv_sec = now->tv_sec + 2;
628 ret = para_exec_cmdline_pid(&st->pid, conf.stat_cmd_arg, fds);
631 ret = mark_fd_nonblocking(fds[1]);
640 if (st->loaded >= st->bufsize) {
641 if (st->bufsize > 1000 * 1000) {
645 st->bufsize += st->bufsize + 1000;
646 st->buf = para_realloc(st->buf, st->bufsize);
648 assert(st->loaded < st->bufsize);
649 ret = read_nonblock(st->fd, st->buf + st->loaded,
650 st->bufsize - st->loaded, &s->rfds, &sz);
652 ret2 = for_each_stat_item(st->buf, st->loaded, update_item);
653 if (ret < 0 || ret2 < 0) {
655 PARA_NOTICE_LOG("closing stat pipe: %s\n",
656 para_strerror(ret < 0? -ret : -ret2));
660 free(stat_content[SI_BASENAME]);
661 stat_content[SI_BASENAME] =
662 para_strdup("stat command terminated!?");
666 sz = ret2; /* what is left */
667 if (sz > 0 && sz < st->loaded)
668 memmove(st->buf, st->buf + st->loaded - sz, sz);
676 static void init_wins(int top_lines)
678 int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
679 in_y = LINES - 1, sep_y = top_lines;
680 int bot_lines = LINES - top_lines - 3, sb_lines = 1, in_lines = 1,
683 assume_default_colors(theme.dflt.fg, theme.dflt.bg);
685 wresize(top.win, top_lines, COLS);
686 mvwin(top.win, top_y, 0);
688 wresize(sb.win, sb_lines, COLS);
689 mvwin(sb.win, sb_y, 0);
691 wresize(sep.win, sep_lines, COLS);
692 mvwin(sep.win, sep_y, 0);
694 wresize(bot.win, bot_lines, COLS);
695 mvwin(bot.win, bot_y, 0);
697 wresize(in.win, in_lines, COLS);
698 mvwin(in.win, in_y, 0);
700 sep.win = newwin(sep_lines, COLS, sep_y, 0);
701 top.win = newwin(top_lines, COLS, top_y, 0);
702 bot.win = newwin(bot_lines, COLS, bot_y, 0);
703 sb.win = newwin(sb_lines, COLS, sb_y, 0);
704 in.win = newwin(in_lines, COLS, in_y, 0);
705 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
706 die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
710 scrollok(bot.win, 1);
711 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
712 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
713 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
714 wattron(top.win, COLOR_PAIR(COLOR_TOP));
725 wmove(sep.win, 0, 0);
726 whline(sep.win, theme.sep_char, COLS);
730 wnoutrefresh(top.win);
731 wnoutrefresh(bot.win);
733 wnoutrefresh(sb.win);
734 wnoutrefresh(in.win);
735 wnoutrefresh(sep.win);
739 static void init_pair_or_die(short pair, short f, short b)
741 if (init_pair(pair, f, b) == ERR)
742 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
745 static void init_colors_or_die(void)
750 die(EXIT_FAILURE, "fatal: No color term\n");
751 if (start_color() == ERR)
752 die(EXIT_FAILURE, "fatal: failed to start colors\n");
753 FOR_EACH_STATUS_ITEM(i)
754 if (theme.data[i].len)
755 init_pair_or_die(i + 1, theme.data[i].color.fg,
756 theme.data[i].color.bg);
757 init_pair_or_die(COLOR_STATUSBAR, theme.sb.fg, theme.sb.bg);
758 init_pair_or_die(COLOR_COMMAND, theme.cmd.fg, theme.cmd.bg);
759 init_pair_or_die(COLOR_OUTPUT, theme.output.fg, theme.output.bg);
760 init_pair_or_die(COLOR_MSG, theme.msg.fg, theme.msg.bg);
761 init_pair_or_die(COLOR_ERRMSG, theme.err_msg.fg, theme.err_msg.bg);
762 init_pair_or_die(COLOR_SEPARATOR, theme.sep.fg, theme.sep.bg);
763 init_pair_or_die(COLOR_TOP, theme.dflt.fg, theme.dflt.bg);
764 init_pair_or_die(COLOR_BOT, theme.dflt.fg, theme.dflt.bg);
767 /* (Re-)initialize the curses library. */
768 static void init_curses(void)
772 if (refresh() == ERR) /* refresh is really needed */
773 die(EXIT_FAILURE, "refresh() failed\n");
774 if (LINES < theme.lines_min || COLS < theme.cols_min)
775 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
776 " (need at least %dx%d)\n", COLS, LINES,
777 theme.cols_min, theme.lines_min);
778 curs_set(0); /* make cursor invisible, ignore errors */
779 nonl(); /* do not NL->CR/NL on output, always returns OK */
780 /* don't echo input */
782 die(EXIT_FAILURE, "fatal: noecho() failed\n");
783 /* take input chars one at a time, no wait for \n */
785 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
786 init_colors_or_die();
787 clear(); /* ignore non-fatal errors */
788 init_wins(theme.top_lines_default);
789 // noecho(); /* don't echo input */
793 * This sucker modifies its first argument. *handler and *arg are
794 * pointers to 0-terminated strings (inside line). Crap.
796 static int split_key_map(char *line, char **handler, char **arg)
798 if (!(*handler = strchr(line + 1, ':')))
802 if (!(*arg = strchr(*handler, ':')))
811 static void check_key_map_args_or_die(void)
816 for (i = 0; i < conf.key_map_given; ++i) {
820 tmp = para_strdup(conf.key_map_arg[i]);
821 if (!split_key_map(tmp, &handler, &arg))
823 if (strlen(handler) != 1)
825 if (*handler != 'x' && *handler != 'd' && *handler != 'i'
830 if (find_cmd_byname(arg) < 0)
833 if (i != conf.key_map_given)
834 die(EXIT_FAILURE, "invalid key map: %s\n", conf.key_map_arg[i]);
838 static void parse_config_file_or_die(bool override)
842 struct gui_cmdline_parser_params params = {
843 .override = override,
845 .check_required = !override,
846 .check_ambiguity = 0,
850 if (conf.config_file_given)
851 config_file = para_strdup(conf.config_file_arg);
853 char *home = para_homedir();
854 config_file = make_message("%s/.paraslash/gui.conf", home);
857 if (!file_exists(config_file)) {
858 if (!conf.config_file_given)
861 PARA_EMERG_LOG("config file %s does not exist\n",
868 * When the gengetopt config file parser is called more than once, any
869 * key map arguments found in the config file are _appended_ to the old
870 * values, even though we turn on ->override. We want the new arguments
871 * to replace the old ones, so we must empty the key_map_arg array
872 * first. Unfortunately, this also clears any key map arguments given
873 * at the command line.
877 for (i = 0; i < conf.key_map_given; i++) {
878 free(conf.key_map_arg[i]);
879 conf.key_map_arg[i] = NULL;
881 conf.key_map_given = 0;
884 gui_cmdline_parser_config_file(config_file, &conf, ¶ms);
885 loglevel = get_loglevel_by_name(conf.loglevel_arg);
886 check_key_map_args_or_die();
892 theme_init(conf.theme_arg, &theme);
895 /* reread configuration, terminate on errors */
896 static void reread_conf(void)
899 * gengetopt might print to stderr and exit on errors. So we have to
900 * shutdown curses first.
903 parse_config_file_or_die(true /* override */);
905 print_in_bar(COLOR_MSG, "config file reloaded\n");
909 * React to various signal-related events
911 static int signal_post_select(struct sched *s, __a_unused void *context)
913 int ret = para_next_signal(&s->rfds);
919 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
922 PARA_WARNING_LOG("caught SIGINT, reset\n");
923 /* Nothing to do. SIGINT killed our child which gets noticed
924 * by do_select and resets everything.
928 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
932 task_notify_all(s, E_GUI_SIGCHLD);
938 static enum exec_status exec_status(void)
940 if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
947 static void exec_pre_select(struct sched *s, void *context)
949 struct exec_task *et = context;
950 if (exec_fds[0] >= 0)
951 para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
952 if (exec_fds[1] >= 0)
953 para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
954 if (task_get_notification(et->task) < 0)
958 static int exec_post_select(struct sched *s, void *context)
960 struct exec_task *ct = context;
963 ret = task_get_notification(ct->task);
964 if (ret == -E_GUI_SIGCHLD && exec_pid > 0) {
966 if (waitpid(exec_pid, &exit_status, WNOHANG) == exec_pid) {
969 PARA_INFO_LOG("command exit status: %d", exit_status);
970 print_in_bar(COLOR_MSG, " ");
973 for (i = 0; i < 2; i++) {
977 ret = read_nonblock(exec_fds[i],
978 ct->command_buf[i] + ct->cbo[i],
979 COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
982 ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
983 ct->cbo[i], add_output_line, &i);
984 if (sz != ct->cbo[i]) { /* at least one line found */
985 refresh_window(&bot);
988 if (ret < 0 || exec_pid == 0) {
990 PARA_NOTICE_LOG("closing command fd %d: %s",
991 i, para_strerror(-ret));
996 if (exec_fds[!i] < 0) /* both fds closed */
999 if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
1000 PARA_NOTICE_LOG("discarding overlong line");
1002 ct->flags[i] = FELF_DISCARD_FIRST;
1008 static void input_pre_select(struct sched *s, __a_unused void *context)
1010 if (exec_status() != EXEC_XCMD)
1011 para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
1012 if (window_update_needed())
1016 /* read from command pipe and print data to bot window */
1017 static void exec_and_display(const char *file_and_args)
1019 int ret, fds[3] = {0, 1, 1};
1021 outputf(COLOR_COMMAND, "%s", file_and_args);
1022 ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1025 ret = mark_fd_nonblocking(fds[1]);
1028 ret = mark_fd_nonblocking(fds[2]);
1031 exec_fds[0] = fds[1];
1032 exec_fds[1] = fds[2];
1033 print_in_bar(COLOR_MSG, "hit any key to abort\n");
1036 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1041 static void exec_para(const char *args)
1043 char *file_and_args;
1045 file_and_args = make_message(BINDIR "/para_client -- %s", args);
1046 exec_and_display(file_and_args);
1047 free(file_and_args);
1051 * shutdown curses and stat pipe before executing external commands
1053 static void exec_external(char *file_and_args)
1055 int fds[3] = {-1, -1, -1};
1060 para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
1063 static void handle_command(int c)
1067 /* first check user-defined key bindings */
1068 for (i = 0; i < conf.key_map_given; ++i) {
1069 char *tmp, *handler, *arg;
1071 tmp = para_strdup(conf.key_map_arg[i]);
1072 if (!split_key_map(tmp, &handler, &arg)) {
1076 if (strcmp(tmp, km_keyname(c))) {
1080 if (*handler == 'd')
1081 exec_and_display(arg);
1082 else if (*handler == 'x')
1084 else if (*handler == 'p')
1086 else if (*handler == 'i') {
1087 int num = find_cmd_byname(arg);
1089 command_list[num].handler();
1094 /* not found, check internal key bindings */
1095 for (i = 0; command_list[i].handler; i++) {
1096 if (!strcmp(km_keyname(c), command_list[i].key)) {
1097 command_list[i].handler();
1101 print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1105 static int input_post_select(__a_unused struct sched *s, __a_unused void *context)
1108 enum exec_status exs = exec_status();
1110 if (exs == EXEC_XCMD)
1112 if (window_update_needed()) {
1113 if (top.needs_update)
1114 assert(wnoutrefresh(top.win) == OK);
1115 if (bot.needs_update)
1116 assert(wnoutrefresh(bot.win) == OK);
1117 if (sep.needs_update)
1118 assert(wnoutrefresh(sep.win) == OK);
1119 if (sb.needs_update)
1120 assert(wnoutrefresh(sb.win) == OK);
1121 if (in.needs_update)
1122 assert(wnoutrefresh(in.win) == OK);
1124 top.needs_update = bot.needs_update = sb.needs_update =
1125 in.needs_update = sep.needs_update = false;
1127 ret = wgetch(top.win);
1130 if (ret == KEY_RESIZE) {
1131 if (curses_active()) {
1138 if (exs == EXEC_IDLE)
1139 handle_command(ret);
1140 else if (exec_pid > 0)
1141 kill(exec_pid, SIGTERM);
1145 static void print_scroll_msg(void)
1147 unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1148 int first_rbe = first_visible_rbe(&lines_total);
1150 print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1151 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1154 static void com_scroll_top(void)
1156 int i = RINGBUFFER_SIZE - 1, bot_lines = get_num_lines(&bot);
1159 while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1161 /* i is oldest entry */
1162 for (; lines < bot_lines && i >= 0; i--) {
1163 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1166 lines += NUM_LINES(rbe->len);
1169 if (lines > 0 && scroll_position != i) {
1170 scroll_position = i;
1175 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1178 static void com_cancel_scroll(void)
1181 if (scroll_position == 0) {
1182 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1185 scroll_position = 0;
1189 static void com_page_down(void)
1192 int i = scroll_position, bot_lines = get_num_lines(&bot);
1194 while (lines < bot_lines && --i > 0) {
1195 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1198 lines += NUM_LINES(rbe->len);
1201 scroll_position = i;
1206 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1209 static void com_page_up(void)
1212 int fvr = first_visible_rbe(&lines), bot_lines = get_num_lines(&bot);
1214 if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1215 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1218 scroll_position = fvr + 1;
1219 for (; scroll_position > 0; scroll_position--) {
1220 first_visible_rbe(&lines);
1221 if (lines == bot_lines)
1228 static void com_scroll_down(void)
1230 struct rb_entry *rbe;
1231 int rbe_lines, bot_lines = get_num_lines(&bot);
1233 if (!scroll_position) {
1234 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1238 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1239 rbe_lines = NUM_LINES(rbe->len);
1240 wscrl(bot.win, rbe_lines);
1241 wmove(bot.win, bot_lines - rbe_lines, 0);
1242 wattron(bot.win, COLOR_PAIR(rbe->color));
1243 waddstr(bot.win, rbe->msg);
1244 refresh_window(&bot);
1248 static void com_scroll_up(void)
1250 struct rb_entry *rbe = NULL;
1252 int i, first_rbe, num_scroll;
1254 /* the entry that is going to vanish */
1255 rbe = ringbuffer_get(bot_win_rb, scroll_position);
1258 num_scroll = NUM_LINES(rbe->len);
1259 first_rbe = first_visible_rbe(&lines);
1260 if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1263 wscrl(bot.win, -num_scroll);
1264 i = draw_top_rbe(&lines);
1267 while (i > 0 && lines < num_scroll) {
1269 rbe = ringbuffer_get(bot_win_rb, --i);
1272 rbe_lines = NUM_LINES(rbe->len);
1274 wattron(bot.win, COLOR_PAIR(rbe->color));
1275 waddstr(bot.win, "\n");
1276 waddstr(bot.win, rbe->msg);
1281 refresh_window(&bot);
1285 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1288 static void com_ll_decr(void)
1290 if (loglevel <= LL_DEBUG) {
1291 print_in_bar(COLOR_ERRMSG,
1292 "loglevel already at maximal verbosity\n");
1296 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1299 static void com_ll_incr(void)
1301 if (loglevel >= LL_EMERG) {
1302 print_in_bar(COLOR_ERRMSG,
1303 "loglevel already at minimal verbosity\n");
1307 print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1310 static void com_reread_conf(void)
1315 static void com_help(void)
1319 for (i = 0; i < conf.key_map_given; ++i) {
1320 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1321 const char *handler_text = "???", *desc = NULL;
1323 if (!split_key_map(tmp, &handler, &arg)) {
1329 handler_text = "internal";
1330 desc = command_list[find_cmd_byname(arg)].description;
1332 case 'x': handler_text = "external"; break;
1333 case 'd': handler_text = "display "; break;
1334 case 'p': handler_text = "para "; break;
1336 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1337 strlen(arg) < 8? "\t" : "",
1341 for (i = 0; command_list[i].handler; i++) {
1342 struct gui_command gc = command_list[i];
1344 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1345 strlen(gc.name) < 8? "\t" : "",
1348 print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1352 static void com_shrink_top_win(void)
1354 int top_lines = get_num_lines(&top);
1356 if (top_lines <= theme.top_lines_min) {
1357 PARA_WARNING_LOG("can not decrease top window\n");
1360 init_wins(top_lines - 1);
1361 print_in_bar(COLOR_MSG, "%s", "decreased top window");
1364 static void com_enlarge_top_win(void)
1366 int top_lines = get_num_lines(&top), bot_lines = get_num_lines(&bot);
1368 if (bot_lines < 3) {
1369 PARA_WARNING_LOG("can not increase top window\n");
1372 init_wins(top_lines + 1);
1373 print_in_bar(COLOR_MSG, "increased top window");
1376 static void com_version(void)
1378 print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1381 __noreturn static void com_quit(void)
1383 die(EXIT_SUCCESS, "%s", "");
1386 static void com_refresh(void)
1392 static void com_next_theme(void)
1398 static void com_prev_theme(void)
1404 __noreturn static void print_help_and_die(void)
1406 struct ggo_help h = DEFINE_GGO_HELP(gui);
1407 bool d = conf.detailed_help_given;
1409 ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1413 static int setup_tasks_and_schedule(void)
1416 struct exec_task exec_task = {.task = NULL};
1417 struct status_task status_task = {.fd = -1};
1418 struct input_task input_task = {.task = NULL};
1419 struct signal_task *signal_task;
1420 struct sched sched = {
1421 .default_timeout = {
1422 .tv_sec = conf.timeout_arg / 1000,
1423 .tv_usec = (conf.timeout_arg % 1000) * 1000,
1427 exec_task.task = task_register(&(struct task_info) {
1429 .pre_select = exec_pre_select,
1430 .post_select = exec_post_select,
1431 .context = &exec_task,
1434 status_task.task = task_register(&(struct task_info) {
1436 .pre_select = status_pre_select,
1437 .post_select = status_post_select,
1438 .context = &status_task,
1441 input_task.task = task_register(&(struct task_info) {
1443 .pre_select = input_pre_select,
1444 .post_select = input_post_select,
1445 .context = &input_task,
1448 signal_task = signal_init_or_die();
1449 para_install_sighandler(SIGINT);
1450 para_install_sighandler(SIGTERM);
1451 para_install_sighandler(SIGCHLD);
1452 para_install_sighandler(SIGUSR1);
1453 signal_task->task = task_register(&(struct task_info) {
1455 .pre_select = signal_pre_select,
1456 .post_select = signal_post_select,
1457 .context = signal_task,
1459 ret = schedule(&sched);
1460 sched_shutdown(&sched);
1461 signal_shutdown(signal_task);
1466 * The main function of para_gui.
1468 * \param argc Usual argument count.
1469 * \param argv Usual argument vector.
1471 * After initialization para_gui registers the following tasks to the paraslash
1472 * scheduler: status, exec, signal, input.
1474 * The status task executes the para_audioc stat command to obtain the status
1475 * of para_server and para_audiod, and displays this information in the top
1476 * window of para_gui.
1478 * The exec task is responsible for printing the output of the currently
1479 * running executable to the bottom window.
1481 * The signal task performs suitable actions according to any signals received.
1482 * For example it refreshes all windows on terminal size changes and resets the
1483 * terminal on \p SIGTERM.
1485 * The input task reads single key strokes from stdin. For each key pressed, it
1486 * executes the command handler associated with this key.
1488 * \return \p EXIT_SUCCESS or \p EXIT_FAILURE.
1490 int main(int argc, char *argv[])
1492 gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1493 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1494 version_handle_flag("gui", conf.version_given);
1495 if (conf.help_given || conf.detailed_help_given)
1496 print_help_and_die();
1497 parse_config_file_or_die(false /* override */);
1498 bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1499 setlocale(LC_CTYPE, "");
1500 initscr(); /* needed only once, always successful */
1502 return setup_tasks_and_schedule() < 0? EXIT_FAILURE : EXIT_SUCCESS;