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 int signal_pipe;
  34
  35 static struct gui_window {
  36         WINDOW *win;
  37         size_t cols;
  38         size_t lines;
  39 } top, bot, sb, in, sep;
  40
  41 #define RINGBUFFER_SIZE 512
  42 struct rb_entry {
  43         char *msg;
  44         size_t len;
  45         int color;
  46 };
  47 static struct ringbuffer *bot_win_rb;
  48 #define NUM_LINES(len) (1 + (len) / bot.cols)
  49
  50 static unsigned scroll_position;
  51
  52 static pid_t cmd_pid;
  53
  54 static int command_fds[2] = {-1, -1};
  55 static int stat_pipe = -1;
  56 static struct gui_args_info conf;
  57
  58 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  59
  60
  61 /**
  62  * Codes for various colors.
  63  *
  64  * Each status item has its own color pair. The ones defined here start at a
  65  * higher number so that they do not overlap with these.
  66  */
  67 enum gui_color_pair {
  68         COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
  69         COLOR_COMMAND,
  70         COLOR_OUTPUT,
  71         COLOR_MSG,
  72         COLOR_ERRMSG,
  73         COLOR_SEPARATOR,
  74         COLOR_TOP,
  75         COLOR_BOT,
  76 };
  77
  78 struct gui_command {
  79         const char *key;
  80         const char *name;
  81         const char *description;
  82         void (*handler)(void);
  83 };
  84
  85 static struct gui_theme theme;
  86
  87 static void com_help(void);
  88 static void com_reread_conf(void);
  89 static void com_enlarge_top_win(void);
  90 static void com_shrink_top_win(void);
  91 static void com_version(void);
  92 __noreturn static void com_quit(void);
  93 static void com_refresh(void);
  94 static void com_ll_incr(void);
  95 static void com_ll_decr(void);
  96 static void com_prev_theme(void);
  97 static void com_next_theme(void);
  98 static void com_scroll_up(void);
  99 static void com_scroll_down(void);
 100 static void com_page_up(void);
 101 static void com_page_down(void);
 102 static void com_cancel_scrolling(void);
 103 static void com_scroll_top(void);
 104
 105 static struct gui_command command_list[] = {
 106         {
 107                 .key = "?",
 108                 .name = "help",
 109                 .description = "print help",
 110                 .handler = com_help
 111         }, {
 112                 .key = "+",
 113                 .name = "enlarge_win",
 114                 .description = "enlarge the top window",
 115                 .handler = com_enlarge_top_win
 116         }, {
 117                 .key = "-",
 118                 .name = "shrink_win",
 119                 .description = "shrink the top window",
 120                 .handler = com_shrink_top_win
 121         }, {
 122                 .key = "r",
 123                 .name = "reread_conf",
 124                 .description = "reread configuration file",
 125                 .handler = com_reread_conf
 126         }, {
 127                 .key = "q",
 128                 .name = "quit",
 129                 .description = "exit para_gui",
 130                 .handler = com_quit
 131         }, {
 132                 .key = "^L",
 133                 .name = "refresh",
 134                 .description = "redraw the screen",
 135                 .handler = com_refresh
 136         }, {
 137                 .key = ".",
 138                 .name = "next_theme",
 139                 .description = "switch to next theme",
 140                 .handler = com_next_theme
 141         }, {
 142                 .key = ",",
 143                 .name = "prev_theme",
 144                 .description = "switch to previous stream",
 145                 .handler = com_prev_theme
 146         }, {
 147                 .key = ">",
 148                 .name = "ll_incr",
 149                 .description = "increase loglevel (decreases verbosity)",
 150                 .handler = com_ll_incr
 151         }, {
 152                 .key = "<",
 153                 .name = "ll_decr",
 154                 .description = "decrease loglevel (increases verbosity)",
 155                 .handler = com_ll_decr
 156         }, {
 157                 .key = "V",
 158                 .name = "version",
 159                 .description = "show the para_gui version",
 160                 .handler = com_version
 161         }, {
 162                 .key = "<up>",
 163                 .name = "scroll_up",
 164                 .description = "scroll up one line",
 165                 .handler = com_scroll_up
 166         }, {
 167                 .key = "<down>",
 168                 .name = "scroll_down",
 169                 .description = "scroll down one line",
 170                 .handler = com_scroll_down
 171         }, {
 172                 .key = "<ppage>",
 173                 .name = "page_up",
 174                 .description = "scroll up one page",
 175                 .handler = com_page_up
 176         }, {
 177                 .key = "<npage>",
 178                 .name = "page_down",
 179                 .description = "scroll down one page",
 180                 .handler = com_page_down
 181         }, {
 182                 .key = "<home>",
 183                 .name = "scroll_top",
 184                 .description = "scroll to top of buffer",
 185                 .handler = com_scroll_top
 186         }, {
 187                 .key = "<end>",
 188                 .name = "cancel_scroll",
 189                 .description = "deactivate scroll mode",
 190                 .handler = com_cancel_scrolling
 191         }, {
 192                 .handler = NULL
 193         }
 194 };
 195
 196 static int find_cmd_byname(char *name)
 197 {
 198         int i;
 199
 200         for (i = 0; command_list[i].handler; i++)
 201                 if (!strcmp(command_list[i].name, name))
 202                         return i;
 203         return -1;
 204 }
 205
 206 /* isendwin() returns false before initscr() was called */
 207 static bool curses_active(void)
 208 {
 209         return top.win && !isendwin();
 210 }
 211
 212 /* taken from mutt */
 213 static char *km_keyname(int c)
 214 {
 215         static char buf[10];
 216
 217         if (c == KEY_UP) {
 218                 sprintf(buf, "<up>");
 219                 return buf;
 220         }
 221         if (c == KEY_DOWN) {
 222                 sprintf(buf, "<down>");
 223                 return buf;
 224         }
 225         if (c == KEY_LEFT) {
 226                 sprintf(buf, "<left>");
 227                 return buf;
 228         }
 229         if (c == KEY_RIGHT) {
 230                 sprintf(buf, "<right>");
 231                 return buf;
 232         }
 233         if (c == KEY_NPAGE) {
 234                 sprintf(buf, "<npage>");
 235                 return buf;
 236         }
 237         if (c == KEY_PPAGE) {
 238                 sprintf(buf, "<ppage>");
 239                 return buf;
 240         }
 241         if (c == KEY_HOME) {
 242                 sprintf(buf, "<home>");
 243                 return buf;
 244         }
 245         if (c == KEY_END) {
 246                 sprintf(buf, "<end>");
 247                 return buf;
 248         }
 249         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 250                 if (c < 0)
 251                         c += 256;
 252                 if (c < 128) {
 253                         buf[0] = '^';
 254                         buf[1] = (c + '@') & 0x7f;
 255                         buf[2] = 0;
 256                 } else
 257                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 258                                 (c >> 3) & 7, c & 7);
 259         } else if (c >= KEY_F0 && c < KEY_F(256))
 260                 sprintf(buf, "<F%d>", c - KEY_F0);
 261         else if (isprint(c))
 262                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 263         else
 264                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 265         return buf;
 266 }
 267
 268 static char *configfile_exists(void)
 269 {
 270         static char *config_file;
 271         char *tmp;
 272
 273         if (!conf.config_file_given) {
 274                 if (!config_file) {
 275                         char *home = para_homedir();
 276                         config_file = make_message("%s/.paraslash/gui.conf",
 277                                 home);
 278                         free(home);
 279                 }
 280                 tmp = config_file;
 281         } else
 282                 tmp = conf.config_file_arg;
 283         return file_exists(tmp)? tmp: NULL;
 284 }
 285
 286 /* Print given number of spaces to curses window. */
 287 static void add_spaces(WINDOW* win, unsigned int num)
 288 {
 289         char space[] = "                                ";
 290         unsigned sz = sizeof(space) - 1; /* number of spaces */
 291
 292         while (num >= sz)  {
 293                 waddstr(win, space);
 294                 num -= sz;
 295         }
 296         if (num > 0) {
 297                 assert(num < sz);
 298                 space[num] = '\0';
 299                 waddstr(win, space);
 300         }
 301 }
 302
 303 /*
 304  * print aligned string to curses window. This function always prints
 305  * exactly len chars.
 306  */
 307 static int align_str(WINDOW* win, char *str, unsigned int len,
 308                 unsigned int align)
 309 {
 310         int ret, i, num; /* of spaces */
 311         size_t width;
 312
 313         if (!win || !str)
 314                 return 0;
 315         ret = strwidth(str, &width);
 316         if (ret < 0) {
 317                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 318                 width = 0;
 319                 str[0] = '\0';
 320         }
 321         num = len - width;
 322         if (num < 0) {
 323                 str[len] = '\0';
 324                 num = 0;
 325         }
 326         /* replace control characters by spaces */
 327         for (i = 0; i < len && str[i]; i++) {
 328                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 329                         str[i] = ' ';
 330         }
 331         if (align == LEFT) {
 332                 waddstr(win, str);
 333                 add_spaces(win, num);
 334         } else if (align == RIGHT) {
 335                 add_spaces(win, num);
 336                 waddstr(win, str);
 337         } else {
 338                 add_spaces(win, num / 2);
 339                 waddstr(win, str[0]? str: "");
 340                 add_spaces(win, num - num / 2);
 341         }
 342         return 1;
 343 }
 344
 345 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 346 {
 347         char *msg;
 348         va_list ap;
 349
 350         if (!curses_active())
 351                 return;
 352         wattron(in.win, COLOR_PAIR(color));
 353         va_start(ap, fmt);
 354         xvasprintf(&msg, fmt, ap);
 355         va_end(ap);
 356         wmove(in.win, 0, 0);
 357         align_str(in.win, msg, in.cols, LEFT);
 358         free(msg);
 359         wrefresh(in.win);
 360 }
 361
 362 static void print_status_bar(void)
 363 {
 364         char *tmp;
 365
 366         tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
 367         wmove(sb.win, 0, 0);
 368         align_str(sb.win, tmp, sb.cols, CENTER);
 369         free(tmp);
 370 }
 371
 372 /*
 373  * get the number of the oldest rbe that is (partially) visible. On return,
 374  * lines contains the sum of the number of lines of all visible entries. If the
 375  * first one is only partially visible, lines is greater than bot.lines.
 376  */
 377 static int first_visible_rbe(unsigned *lines)
 378 {
 379         int i;
 380         *lines = 0;
 381         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 382                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 383                 int rbe_lines;
 384                 if (!rbe)
 385                         return i - 1;
 386                 rbe_lines = NUM_LINES(rbe->len);
 387                 if (rbe_lines > bot.lines)
 388                         return -1;
 389                 *lines += rbe_lines;
 390                 if (*lines >= bot.lines)
 391                         return i;
 392         }
 393         return RINGBUFFER_SIZE - 1;
 394 }
 395
 396 /*
 397 returns number of first visible rbe, *lines is the number of lines drawn.
 398  */
 399 static int draw_top_rbe(unsigned *lines)
 400 {
 401         int ret, fvr = first_visible_rbe(lines);
 402         struct rb_entry *rbe;
 403         size_t bytes_to_skip, cells_to_skip, width;
 404
 405         if (fvr < 0)
 406                 return -1;
 407         wmove(bot.win, 0, 0);
 408         rbe = ringbuffer_get(bot_win_rb, fvr);
 409         if (!rbe)
 410                 return -1;
 411         if (*lines > bot.lines) {
 412                 /* rbe is partially visible multi-line */
 413                 cells_to_skip = (*lines - bot.lines) * bot.cols;
 414                 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
 415                 if (ret < 0)
 416                         return ret;
 417                 ret = strwidth(rbe->msg + bytes_to_skip, &width);
 418                 if (ret < 0)
 419                         return ret;
 420         } else {
 421                 bytes_to_skip = 0;
 422                 width = rbe->len;
 423         }
 424         wattron(bot.win, COLOR_PAIR(rbe->color));
 425         waddstr(bot.win, rbe->msg + bytes_to_skip);
 426         *lines = NUM_LINES(width);
 427         return fvr;
 428 }
 429
 430 static void redraw_bot_win(void)
 431 {
 432         unsigned lines;
 433         int i;
 434
 435         wmove(bot.win, 0, 0);
 436         wclear(bot.win);
 437         i = draw_top_rbe(&lines);
 438         if (i <= 0)
 439                 goto out;
 440         while (i > 0 && lines < bot.lines) {
 441                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 442                 if (!rbe) {
 443                         lines++;
 444                         waddstr(bot.win, "\n");
 445                         continue;
 446                 }
 447                 lines += NUM_LINES(rbe->len);
 448                 wattron(bot.win, COLOR_PAIR(rbe->color));
 449                 waddstr(bot.win, "\n");
 450                 waddstr(bot.win, rbe->msg);
 451         }
 452 out:
 453         wrefresh(bot.win);
 454 }
 455
 456 static void rb_add_entry(int color, char *msg)
 457 {
 458         struct rb_entry *old, *new;
 459         int x, y;
 460         size_t len;
 461
 462         if (strwidth(msg, &len) < 0)
 463                 return;
 464         new = para_malloc(sizeof(struct rb_entry));
 465         new->color = color;
 466         new->len = len;
 467         new->msg = msg;
 468         old = ringbuffer_add(bot_win_rb, new);
 469         if (old) {
 470                 free(old->msg);
 471                 free(old);
 472         }
 473         if (scroll_position) {
 474                 /* discard current scrolling, like xterm does */
 475                 scroll_position = 0;
 476                 redraw_bot_win();
 477                 return;
 478         }
 479         wattron(bot.win, COLOR_PAIR(color));
 480         getyx(bot.win, y, x);
 481         if (y || x)
 482                 waddstr(bot.win, "\n");
 483         waddstr(bot.win, msg);
 484 }
 485
 486 /*
 487  * print formated output to bot win and refresh
 488  */
 489 __printf_2_3 static void outputf(int color, const char* fmt,...)
 490 {
 491         char *msg;
 492         va_list ap;
 493
 494         if (!curses_active())
 495                 return;
 496         va_start(ap, fmt);
 497         xvasprintf(&msg, fmt, ap);
 498         va_end(ap);
 499         rb_add_entry(color, msg);
 500         wrefresh(bot.win);
 501 }
 502
 503 static int add_output_line(char *line, void *data)
 504 {
 505         int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 506
 507         if (!curses_active())
 508                 return 1;
 509         rb_add_entry(color, para_strdup(line));
 510         return 1;
 511 }
 512
 513 static int loglevel;
 514
 515 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 516 {
 517         va_list ap;
 518
 519         if (ll < loglevel)
 520                 return;
 521         va_start(ap, fmt);
 522         if (curses_active()) {
 523                 int color = ll <= LL_NOTICE? COLOR_MSG : COLOR_ERRMSG;
 524                 char *msg;
 525                 unsigned bytes = xvasprintf(&msg, fmt, ap);
 526                 if (bytes > 0 && msg[bytes - 1] == '\n')
 527                         msg[bytes - 1] = '\0'; /* cut trailing newline */
 528                 rb_add_entry(color, msg);
 529                 wrefresh(bot.win);
 530         } else if (cmd_pid <= 0) /* no external command running */
 531                 vfprintf(stderr, fmt, ap);
 532         va_end(ap);
 533 }
 534 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 535
 536 static void setup_signal_handling(void)
 537 {
 538         signal_pipe = para_signal_init();
 539         para_install_sighandler(SIGINT);
 540         para_install_sighandler(SIGTERM);
 541         para_install_sighandler(SIGCHLD);
 542         para_install_sighandler(SIGWINCH);
 543         para_install_sighandler(SIGUSR1);
 544 }
 545
 546 static void shutdown_curses(void)
 547 {
 548         def_prog_mode();
 549         endwin();
 550 }
 551
 552 /* disable curses, print a message, kill running processes and exit */
 553 __noreturn __printf_2_3 static void die(int exit_code, const char* fmt, ...)
 554 {
 555         va_list argp;
 556
 557         shutdown_curses();
 558         va_start(argp, fmt);
 559         vfprintf(stderr, fmt, argp);
 560         va_end(argp);
 561         /* kill every process in the process group and exit */
 562         para_sigaction(SIGTERM, SIG_IGN);
 563         kill(0, SIGTERM);
 564         exit(exit_code);
 565 }
 566
 567 /*
 568  * init all windows
 569  */
 570 static void init_wins(int top_lines)
 571 {
 572         int top_y = 0, bot_y = top_lines + 1, sb_y = LINES - 2,
 573                 in_y = LINES - 1, sep_y = top_lines;
 574
 575         top.lines = top_lines;
 576         bot.lines = LINES - top.lines - 3;
 577         sb.lines = in.lines = sep.lines = 1;
 578
 579         top.cols = bot.cols = sb.cols = in.cols = sep.cols = COLS;
 580
 581         assume_default_colors(theme.default_fg, theme.default_bg);
 582         if (top.win) {
 583                 wresize(top.win, top.lines, top.cols);
 584                 mvwin(top.win, top_y, 0);
 585
 586                 wresize(sb.win, sb.lines, sb.cols);
 587                 mvwin(sb.win, sb_y, 0);
 588
 589                 wresize(sep.win, sep.lines, sep.cols);
 590                 mvwin(sep.win, sep_y, 0);
 591
 592                 wresize(bot.win, bot.lines, bot.cols);
 593                 mvwin(bot.win, bot_y, 0);
 594
 595                 wresize(in.win, in.lines, in.cols);
 596                 mvwin(in.win, in_y, 0);
 597         } else {
 598                 sep.win = newwin(sep.lines, sep.cols, sep_y, 0);
 599                 top.win = newwin(top.lines, top.cols, top_y, 0);
 600                 bot.win = newwin(bot.lines, bot.cols, bot_y, 0);
 601                 sb.win = newwin(sb.lines, sb.cols, sb_y, 0);
 602                 in.win = newwin(in.lines, in.cols, in_y, 0);
 603                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 604                         die(EXIT_FAILURE, "Error: Cannot create curses windows\n");
 605                 wclear(bot.win);
 606                 wclear(sb.win);
 607                 wclear(in.win);
 608                 scrollok(bot.win, 1);
 609                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 610                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 611                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 612                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 613                 nodelay(top.win, 1);
 614                 nodelay(bot.win, 1);
 615                 nodelay(sb.win, 1);
 616                 nodelay(in.win, 0);
 617
 618                 keypad(top.win, 1);
 619                 keypad(bot.win, 1);
 620                 keypad(sb.win, 1);
 621                 keypad(in.win, 1);
 622         }
 623         wmove(sep.win, 0, 0);
 624         whline(sep.win, theme.sep_char, COLS);
 625         wclear(top.win);
 626         //wclear(bot.win);
 627         wnoutrefresh(top.win);
 628         wnoutrefresh(bot.win);
 629         print_status_bar();
 630         wnoutrefresh(sb.win);
 631         wnoutrefresh(in.win);
 632         wnoutrefresh(sep.win);
 633         doupdate();
 634 }
 635
 636 /*
 637  * Print stat item #i to curses window
 638  */
 639 static void print_stat_item(int i)
 640 {
 641         char *tmp;
 642         struct stat_item_data d = theme.data[i];
 643         char *c = stat_content[i];
 644
 645         if (!curses_active() || !d.len || !c)
 646                 return;
 647         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 648         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 649         wrefresh(top.win);
 650         wattron(top.win, COLOR_PAIR(i + 1));
 651         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 652         free(tmp);
 653         wrefresh(top.win);
 654 }
 655
 656 static int update_item(int item_num, char *buf)
 657 {
 658         char **c = stat_content + item_num;
 659
 660         free(*c);
 661         if (buf && buf[0])
 662                 goto dup;
 663         switch (item_num) {
 664         case SI_ARTIST:
 665                 *c = para_strdup("(artist tag not set)");
 666                 goto print;
 667         case SI_TITLE:
 668                 *c = para_strdup("(title tag not set)");
 669                 goto print;
 670         case SI_YEAR:
 671                 *c = para_strdup("????");
 672                 goto print;
 673         case SI_ALBUM:
 674                 *c = para_strdup("(album tag not set)");
 675                 goto print;
 676         case SI_COMMENT:
 677                 *c = para_strdup("(comment tag not set)");
 678                 goto print;
 679         }
 680 dup:
 681         *c = para_strdup(buf);
 682 print:
 683         print_stat_item(item_num);
 684         return 1;
 685 }
 686
 687 static int read_stat_pipe(fd_set *rfds)
 688 {
 689         static char *buf;
 690         static int bufsize, loaded;
 691         int ret, ret2;
 692         size_t sz;
 693
 694         if (stat_pipe < 0)
 695                 return 0;
 696         if (loaded >= bufsize) {
 697                 if (bufsize > 1000 * 1000) {
 698                         loaded = 0;
 699                         return 0;
 700                 }
 701                 bufsize += bufsize + 1000;
 702                 buf = para_realloc(buf, bufsize);
 703         }
 704         assert(loaded < bufsize);
 705         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 706                 rfds, &sz);
 707         loaded += sz;
 708         ret2 = for_each_stat_item(buf, loaded, update_item);
 709         if (ret < 0 || ret2 < 0) {
 710                 loaded = 0;
 711                 return ret2 < 0? ret2 : ret;
 712         }
 713         sz = ret2; /* what is left */
 714         if (sz > 0 && sz < loaded)
 715                 memmove(buf, buf + loaded - sz, sz);
 716         loaded = sz;
 717         return 1;
 718 }
 719
 720 static void print_all_items(void)
 721 {
 722         int i;
 723
 724         if (!curses_active())
 725                 return;
 726         FOR_EACH_STATUS_ITEM(i)
 727                 print_stat_item(i);
 728 }
 729
 730 static void clear_all_items(void)
 731 {
 732         int i;
 733
 734         FOR_EACH_STATUS_ITEM(i) {
 735                 free(stat_content[i]);
 736                 stat_content[i] = para_strdup("");
 737         }
 738 }
 739
 740 static void init_pair_or_die(short pair, short f, short b)
 741 {
 742         if (init_pair(pair, f, b) == ERR)
 743                 die(EXIT_FAILURE, "fatal: init_pair() failed\n");
 744 }
 745
 746 static void init_colors_or_die(void)
 747 {
 748         int i;
 749
 750         if (!has_colors())
 751                 die(EXIT_FAILURE, "fatal: No color term\n");
 752         if (start_color() == ERR)
 753                 die(EXIT_FAILURE, "fatal: failed to start colors\n");
 754         FOR_EACH_STATUS_ITEM(i)
 755                 if (theme.data[i].len)
 756                         init_pair_or_die(i + 1, theme.data[i].fg,
 757                                 theme.data[i].bg);
 758         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 759         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 760         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 761         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 762         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 763         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 764         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 765         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 766 }
 767
 768 /* (Re-)initialize the curses library. */
 769 static void init_curses(void)
 770 {
 771         if (curses_active())
 772                 return;
 773         if (top.win && refresh() == ERR) /* refresh is really needed */
 774                 die(EXIT_FAILURE, "refresh() failed\n");
 775         if (LINES < theme.lines_min || COLS < theme.cols_min)
 776                 die(EXIT_FAILURE, "Terminal (%dx%d) too small"
 777                         " (need at least %dx%d)\n", COLS, LINES,
 778                         theme.cols_min, theme.lines_min);
 779         curs_set(0); /* make cursor invisible, ignore errors */
 780         nonl(); /* do not NL->CR/NL on output, always returns OK */
 781         /* don't echo input */
 782         if (noecho() == ERR)
 783                 die(EXIT_FAILURE, "fatal: noecho() failed\n");
 784         /* take input chars one at a time, no wait for \n */
 785         if (cbreak() == ERR)
 786                 die(EXIT_FAILURE, "fatal: cbreak() failed\n");
 787         init_colors_or_die();
 788         clear(); /* ignore non-fatal errors */
 789         init_wins(theme.top_lines_default);
 790         print_all_items();
 791         // noecho(); /* don't echo input */
 792 }
 793
 794 static void check_sigchld(void)
 795 {
 796         int ret;
 797         pid_t pid;
 798
 799 reap_next_child:
 800         ret = para_reap_child(&pid);
 801         if (ret <= 0)
 802                 return;
 803         if (pid == cmd_pid)
 804                 cmd_pid = 0;
 805         goto reap_next_child;
 806 }
 807
 808 /*
 809  * This sucker modifies its first argument. *handler and *arg are
 810  * pointers to 0-terminated strings (inside line). Crap.
 811  */
 812 static int split_key_map(char *line, char **handler, char **arg)
 813 {
 814         if (!(*handler = strchr(line + 1, ':')))
 815                 goto err_out;
 816         **handler = '\0';
 817         (*handler)++;
 818         if (!(*arg = strchr(*handler, ':')))
 819                 goto err_out;
 820         **arg = '\0';
 821         (*arg)++;
 822         return 1;
 823 err_out:
 824         return 0;
 825 }
 826
 827 static int check_key_map_args(void)
 828 {
 829         char *s;
 830         int i, ret = -1;
 831         char *tmp = NULL, *handler, *arg;
 832
 833         for (i = 0; i < conf.key_map_given; ++i) {
 834                 s = conf.key_map_arg[i];
 835                 if (!(*s))
 836                         goto out;
 837                 free(tmp);
 838                 tmp = para_strdup(s);
 839                 if (!split_key_map(tmp, &handler, &arg))
 840                         goto out;
 841                 if (strlen(handler) != 1)
 842                         goto out;
 843                 if (*handler != 'x'
 844                         && *handler != 'd'
 845                         && *handler != 'i'
 846                         && *handler != 'p')
 847                         goto out;
 848                 if (*handler != 'i')
 849                         continue;
 850                 if (find_cmd_byname(arg) < 0)
 851                         goto out;
 852         }
 853         ret = 0;
 854 out:
 855         free(tmp);
 856         return ret;
 857 }
 858
 859 /*
 860  * React to various signal-related events
 861  */
 862 static void handle_signal(int sig)
 863 {
 864         switch (sig) {
 865         case SIGTERM:
 866                 die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
 867                 return;
 868         case SIGWINCH:
 869                 if (curses_active()) {
 870                         shutdown_curses();
 871                         init_curses();
 872                         redraw_bot_win();
 873                 }
 874                 return;
 875         case SIGINT:
 876                 PARA_WARNING_LOG("caught SIGINT, reset\n");
 877                 /* Nothing to do. SIGINT killed our child which gets noticed
 878                  * by do_select and resets everything.
 879                  */
 880                 return;
 881         case SIGUSR1:
 882                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
 883                 com_reread_conf();
 884                 return;
 885         case SIGCHLD:
 886                 check_sigchld();
 887                 return;
 888         }
 889 }
 890
 891 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 892 {
 893         static struct timeval next_exec, atm, diff;
 894         int ret, fds[3] = {0, 1, 0};
 895         pid_t pid;
 896
 897         if (stat_pipe >= 0)
 898                 goto success;
 899         /* Avoid busy loop */
 900         gettimeofday(&atm, NULL);
 901         if (tv_diff(&next_exec, &atm, &diff) > 0) {
 902                 if (tv_diff(&diff, tv, NULL) < 0)
 903                         *tv = diff;
 904                 return;
 905         }
 906         next_exec.tv_sec = atm.tv_sec + 2;
 907         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 908         if (ret < 0)
 909                 return;
 910         ret = mark_fd_nonblocking(fds[1]);
 911         if (ret < 0) {
 912                 close(fds[1]);
 913                 return;
 914         }
 915         stat_pipe = fds[1];
 916 success:
 917         para_fd_set(stat_pipe, rfds, max_fileno);
 918 }
 919
 920 #define COMMAND_BUF_SIZE 32768
 921
 922 /*
 923  * This is the core select loop. Besides the (internal) signal
 924  * pipe, the following other fds are checked according to the mode:
 925  *
 926  * GETCH_MODE: check stdin, return when key is pressed
 927  *
 928  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 929  * stdout and stderr or when any key is pressed.
 930  *
 931  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 932  * is running. During that time curses is disabled.  Returns when
 933  * cmd_pid == 0.
 934  */
 935 static int do_select(int mode)
 936 {
 937         fd_set rfds;
 938         int ret, i, max_fileno;
 939         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
 940         int cbo[2] = {0, 0}; /* command buf offsets */
 941         struct timeval tv;
 942         unsigned flags[2] = {0, 0}; /* for for_each_line() */
 943
 944 repeat:
 945         tv.tv_sec = conf.timeout_arg  / 1000;
 946         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 947 //      ret = refresh_status();
 948         FD_ZERO(&rfds);
 949         max_fileno = 0;
 950         status_pre_select(&rfds, &max_fileno, &tv);
 951         /* signal pipe */
 952         para_fd_set(signal_pipe, &rfds, &max_fileno);
 953         /* command pipe only for COMMAND_MODE */
 954         if (mode == COMMAND_MODE) {
 955                 if (command_fds[0] >= 0)
 956                         para_fd_set(command_fds[0], &rfds, &max_fileno);
 957                 if (command_fds[1] >= 0)
 958                         para_fd_set(command_fds[1], &rfds, &max_fileno);
 959         }
 960         if (mode == GETCH_MODE || mode == COMMAND_MODE)
 961                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
 962         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 963         if (ret <= 0)
 964                 goto check_return; /* skip fd checks */
 965         /* signals */
 966         ret = para_next_signal(&rfds);
 967         if (ret > 0)
 968                 handle_signal(ret);
 969         /* read command pipe if ready */
 970         if (mode == COMMAND_MODE) {
 971                 for (i = 0; i < 2; i++) {
 972                         size_t sz;
 973                         if (command_fds[i] < 0)
 974                                 continue;
 975                         ret = read_nonblock(command_fds[i],
 976                                 command_buf[i] + cbo[i],
 977                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
 978                         cbo[i] += sz;
 979                         sz = cbo[i];
 980                         cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
 981                                 add_output_line, &i);
 982                         if (sz != cbo[i]) { /* at least one line found */
 983                                 wrefresh(bot.win);
 984                                 flags[i] = 0;
 985                         }
 986                         if (ret < 0) {
 987                                 PARA_NOTICE_LOG("closing command fd %d: %s\n",
 988                                         i, para_strerror(-ret));
 989                                 close(command_fds[i]);
 990                                 command_fds[i] = -1;
 991                                 flags[i] = 0;
 992                                 cbo[i] = 0;
 993                                 if (command_fds[!i] < 0) /* both fds closed */
 994                                         return 0;
 995                         }
 996                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
 997                                 PARA_NOTICE_LOG("discarding overlong line\n");
 998                                 cbo[i] = 0;
 999                                 flags[i] = FELF_DISCARD_FIRST;
1000                         }
1001                 }
1002         }
1003         ret = read_stat_pipe(&rfds);
1004         if (ret < 0) {
1005                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1006                 close(stat_pipe);
1007                 stat_pipe = -1;
1008                 clear_all_items();
1009                 free(stat_content[SI_BASENAME]);
1010                 stat_content[SI_BASENAME] =
1011                         para_strdup("stat command terminated!?");
1012                 print_all_items();
1013         }
1014 check_return:
1015         switch (mode) {
1016         case COMMAND_MODE:
1017                 ret = wgetch(top.win);
1018                 if (ret != ERR && ret != KEY_RESIZE) {
1019                         if (cmd_pid)
1020                                 kill(cmd_pid, SIGTERM);
1021                         return -1;
1022                 }
1023                 break;
1024         case GETCH_MODE:
1025                 ret = wgetch(top.win);
1026                 if (ret != ERR && ret != KEY_RESIZE)
1027                         return ret;
1028                 break;
1029         case EXTERNAL_MODE:
1030                 if (cmd_pid == 0)
1031                         return 0;
1032         }
1033         goto repeat;
1034 }
1035
1036 /* read from command pipe and print data to bot window */
1037 static void exec_and_display_cmd(const char *cmd)
1038 {
1039         int ret, fds[3] = {0, 1, 1};
1040
1041         outputf(COLOR_COMMAND, "%s", cmd);
1042         ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1043         if (ret < 0)
1044                 return;
1045         ret = mark_fd_nonblocking(fds[1]);
1046         if (ret < 0)
1047                 goto fail;
1048         ret = mark_fd_nonblocking(fds[2]);
1049         if (ret < 0)
1050                 goto fail;
1051         command_fds[0] = fds[1];
1052         command_fds[1] = fds[2];
1053         if (do_select(COMMAND_MODE) >= 0)
1054                 PARA_INFO_LOG("command complete\n");
1055         else
1056                 PARA_NOTICE_LOG("command aborted\n");
1057         print_in_bar(COLOR_MSG, " ");
1058         return;
1059 fail:
1060         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1061         close(command_fds[0]);
1062         close(command_fds[1]);
1063 }
1064
1065 static void para_cmd(char *cmd)
1066 {
1067         char *c;
1068
1069         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1070         c = make_message(BINDIR "/para_client -- %s", cmd);
1071         exec_and_display_cmd(c);
1072         free(c);
1073 }
1074
1075 static void display_cmd(char *cmd)
1076 {
1077         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1078         exec_and_display_cmd(cmd);
1079 }
1080
1081 /*
1082  * shutdown curses and stat pipe before executing external commands
1083  */
1084 static void external_cmd(char *cmd)
1085 {
1086         int fds[3] = {-1, -1, -1};
1087
1088         if (cmd_pid)
1089                 return;
1090         shutdown_curses();
1091         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1092                 return;
1093         do_select(EXTERNAL_MODE);
1094         init_curses();
1095 }
1096
1097 static void print_scroll_msg(void)
1098 {
1099         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1100         int first_rbe = first_visible_rbe(&lines_total);
1101
1102         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1103                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1104 }
1105
1106 static void com_scroll_top(void)
1107 {
1108         int i = RINGBUFFER_SIZE - 1;
1109         unsigned lines = 0;
1110
1111         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1112                 i--;
1113         /* i is oldest entry */
1114         for (; lines < bot.lines && i >= 0; i--) {
1115                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1116                 if (!rbe)
1117                         break;
1118                 lines += NUM_LINES(rbe->len);
1119         }
1120         i++;
1121         if (lines > 0 && scroll_position != i) {
1122                 scroll_position = i;
1123                 redraw_bot_win();
1124                 print_scroll_msg();
1125                 return;
1126         }
1127         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1128 }
1129
1130 static void com_cancel_scrolling(void)
1131 {
1132
1133         if (scroll_position == 0) {
1134                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1135                 return;
1136         }
1137         scroll_position = 0;
1138         redraw_bot_win();
1139 }
1140
1141 static void com_page_down(void)
1142 {
1143         unsigned lines = 0;
1144         int i = scroll_position;
1145
1146         while (lines < bot.lines && --i > 0) {
1147                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1148                 if (!rbe)
1149                         break;
1150                 lines += NUM_LINES(rbe->len);
1151         }
1152         if (lines) {
1153                 scroll_position = i;
1154                 redraw_bot_win();
1155                 print_scroll_msg();
1156                 return;
1157         }
1158         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1159 }
1160
1161 static void com_page_up(void)
1162 {
1163         unsigned lines;
1164         int fvr = first_visible_rbe(&lines);
1165
1166         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1167                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1168                 return;
1169         }
1170         scroll_position = fvr + 1;
1171         for (; scroll_position > 0; scroll_position--) {
1172                 first_visible_rbe(&lines);
1173                 if (lines == bot.lines)
1174                         break;
1175         }
1176         redraw_bot_win();
1177         print_scroll_msg();
1178 }
1179
1180 static void com_scroll_down(void)
1181 {
1182         struct rb_entry *rbe;
1183         int rbe_lines;
1184
1185         if (!scroll_position) {
1186                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1187                 return;
1188         }
1189         scroll_position--;
1190         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1191         rbe_lines = NUM_LINES(rbe->len);
1192         wscrl(bot.win, rbe_lines);
1193         wmove(bot.win, bot.lines - rbe_lines, 0);
1194         wattron(bot.win, COLOR_PAIR(rbe->color));
1195         waddstr(bot.win, rbe->msg);
1196         wrefresh(bot.win);
1197         print_scroll_msg();
1198 }
1199
1200 static void com_scroll_up(void)
1201 {
1202         struct rb_entry *rbe = NULL;
1203         unsigned lines;
1204         int i, first_rbe, num_scroll;
1205
1206         /* the entry that is going to vanish */
1207         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1208         if (!rbe)
1209                 goto err_out;
1210         num_scroll = NUM_LINES(rbe->len);
1211         first_rbe = first_visible_rbe(&lines);
1212         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1213                 goto err_out;
1214         scroll_position++;
1215         wscrl(bot.win, -num_scroll);
1216         i = draw_top_rbe(&lines);
1217         if (i < 0)
1218                 goto err_out;
1219         while (i > 0 && lines < num_scroll) {
1220                 int rbe_lines;
1221                 rbe = ringbuffer_get(bot_win_rb, --i);
1222                 if (!rbe)
1223                         break;
1224                 rbe_lines = NUM_LINES(rbe->len);
1225                 lines += rbe_lines;
1226                 wattron(bot.win, COLOR_PAIR(rbe->color));
1227                 waddstr(bot.win, "\n");
1228                 waddstr(bot.win, rbe->msg);
1229                 if (!i)
1230                         break;
1231                 i--;
1232         }
1233         wrefresh(bot.win);
1234         print_scroll_msg();
1235         return;
1236 err_out:
1237         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1238 }
1239
1240 static void com_ll_decr(void)
1241 {
1242         if (loglevel <= LL_DEBUG) {
1243                 print_in_bar(COLOR_ERRMSG,
1244                         "loglevel already at maximal verbosity\n");
1245                 return;
1246         }
1247         loglevel--;
1248         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1249 }
1250
1251 static void com_ll_incr(void)
1252 {
1253         if (loglevel >= LL_EMERG) {
1254                 print_in_bar(COLOR_ERRMSG,
1255                         "loglevel already at minimal verbosity\n");
1256                 return;
1257         }
1258         loglevel++;
1259         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1260 }
1261
1262 /*
1263  * reread configuration, terminate on errors
1264  */
1265 static void com_reread_conf(void)
1266 {
1267         char *cf = configfile_exists();
1268         struct gui_cmdline_parser_params params = {
1269                 .override = 1,
1270                 .initialize = 1,
1271                 .check_required = 0,
1272                 .check_ambiguity = 0,
1273                 .print_errors = 0,
1274         };
1275
1276         if (!cf) {
1277                 PARA_WARNING_LOG("there is no configuration to read\n");
1278                 return;
1279         }
1280         PARA_INFO_LOG("rereading command line options and config file\n");
1281         /*
1282          * Despite .print_errors is set to 0, gengetopt will print to stderr
1283          * anyway, and exit on errors. So we have to shutdown curses first.
1284          */
1285         shutdown_curses();
1286         gui_cmdline_parser_config_file(cf, &conf, &params);
1287         init_curses();
1288         PARA_NOTICE_LOG("config file reloaded\n");
1289         if (check_key_map_args() < 0)
1290                 die(EXIT_FAILURE, "invalid key map\n");
1291 }
1292
1293 static void com_help(void)
1294 {
1295         int i;
1296
1297         for (i = 0; i < conf.key_map_given; ++i) {
1298                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1299                 const char *handler_text = "???", *desc = NULL;
1300
1301                 if (!split_key_map(tmp, &handler, &arg)) {
1302                         free(tmp);
1303                         return;
1304                 }
1305                 switch (*handler) {
1306                         case 'i':
1307                                 handler_text = "internal";
1308                                 desc = command_list[find_cmd_byname(arg)].description;
1309                                 break;
1310                         case 'x': handler_text = "external"; break;
1311                         case 'd': handler_text = "display "; break;
1312                         case 'p': handler_text = "para    "; break;
1313                 }
1314                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1315                         strlen(arg) < 8? "\t" : "",
1316                         desc? desc : "");
1317                 free(tmp);
1318         }
1319         for (i = 0; command_list[i].handler; i++) {
1320                 struct gui_command gc = command_list[i];
1321
1322                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1323                         strlen(gc.name) < 8? "\t" : "",
1324                         gc.description);
1325         }
1326         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1327                 "for more info");
1328 }
1329
1330 static void com_shrink_top_win(void)
1331 {
1332         if (top.lines <= theme.top_lines_min) {
1333                 PARA_WARNING_LOG("can not decrease top window\n");
1334                 return;
1335         }
1336         init_wins(top.lines - 1);
1337         print_all_items();
1338         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1339 }
1340
1341 static void com_enlarge_top_win(void)
1342 {
1343         if (bot.lines < 3) {
1344                 PARA_WARNING_LOG("can not increase top window\n");
1345                 return;
1346         }
1347         init_wins(top.lines + 1);
1348         print_all_items();
1349         print_in_bar(COLOR_MSG, "increased top window");
1350 }
1351
1352 static void com_version(void)
1353 {
1354         print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1355 }
1356
1357 __noreturn static void com_quit(void)
1358 {
1359         die(EXIT_SUCCESS, "%s", "");
1360 }
1361
1362 static void com_refresh(void)
1363 {
1364         shutdown_curses();
1365         init_curses();
1366 }
1367
1368 static void com_next_theme(void)
1369 {
1370         theme_next(&theme);
1371         com_refresh();
1372 }
1373
1374 static void com_prev_theme(void)
1375 {
1376         theme_prev(&theme);
1377         com_refresh();
1378 }
1379
1380 static void handle_command(int c)
1381 {
1382         int i;
1383
1384         /* first check user-defined key bindings */
1385         for (i = 0; i < conf.key_map_given; ++i) {
1386                 char *tmp, *handler, *arg;
1387
1388                 tmp = para_strdup(conf.key_map_arg[i]);
1389                 if (!split_key_map(tmp, &handler, &arg)) {
1390                         free(tmp);
1391                         return;
1392                 }
1393                 if (strcmp(tmp, km_keyname(c))) {
1394                         free(tmp);
1395                         continue;
1396                 }
1397                 if (*handler == 'd')
1398                         display_cmd(arg);
1399                 else if (*handler == 'x')
1400                         external_cmd(arg);
1401                 else if (*handler == 'p')
1402                         para_cmd(arg);
1403                 else if (*handler == 'i') {
1404                         int num = find_cmd_byname(arg);
1405                         if (num >= 0)
1406                                 command_list[num].handler();
1407                 }
1408                 free(tmp);
1409                 return;
1410         }
1411         /* not found, check internal key bindings */
1412         for (i = 0; command_list[i].handler; i++) {
1413                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1414                         command_list[i].handler();
1415                         return;
1416                 }
1417         }
1418         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1419                 km_keyname(c));
1420 }
1421
1422 __noreturn static void print_help_and_die(void)
1423 {
1424         struct ggo_help h = DEFINE_GGO_HELP(gui);
1425         bool d = conf.detailed_help_given;
1426
1427         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1428         exit(0);
1429 }
1430
1431 int main(int argc, char *argv[])
1432 {
1433         int ret;
1434         char *cf;
1435
1436         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1437         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1438         version_handle_flag("gui", conf.version_given);
1439         if (conf.help_given || conf.detailed_help_given)
1440                 print_help_and_die();
1441         cf = configfile_exists();
1442         if (!cf && conf.config_file_given)
1443                 die(EXIT_FAILURE, "can not read config file %s\n",
1444                         conf.config_file_arg);
1445         if (cf) {
1446                 struct gui_cmdline_parser_params params = {
1447                         .override = 0,
1448                         .initialize = 0,
1449                         .check_required = 0,
1450                         .check_ambiguity = 0,
1451                         .print_errors = 1,
1452                 };
1453                 gui_cmdline_parser_config_file(cf, &conf, &params);
1454                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1455         }
1456         if (check_key_map_args() < 0)
1457                 die(EXIT_FAILURE, "invalid key map\n");
1458         theme_init(conf.theme_arg, &theme);
1459         setup_signal_handling();
1460         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1461         setlocale(LC_CTYPE, "");
1462         initscr(); /* needed only once, always successful */
1463         init_curses();
1464         for (;;) {
1465                 print_status_bar();
1466                 ret = do_select(GETCH_MODE);
1467                 if (!ret)
1468                         continue;
1469                 print_in_bar(COLOR_MSG, " ");
1470                 handle_command(ret);
1471         }
1472 }