gui.c

   1 /*
   2  * Copyright (C) 1998-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c Curses-based interface for paraslash. */
   8
   9 #include <regex.h>
  10 #include <signal.h>
  11 #include <sys/types.h>
  12 #include <dirent.h>
  13 #include <curses.h>
  14
  15 #include "gui.cmdline.h"
  16 #include "para.h"
  17 #include "gui.h"
  18 #include "string.h"
  19 #include "ringbuffer.h"
  20 #include "fd.h"
  21 #include "error.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "signal.h"
  25
  26 /** define the array of error lists needed by para_gui */
  27 INIT_GUI_ERRLISTS;
  28 static char *stat_content[NUM_STAT_ITEMS];
  29
  30 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  31
  32 static int signal_pipe;
  33
  34 static struct win_data {
  35         WINDOW *win;
  36         NCURSES_SIZE_T begx;
  37         NCURSES_SIZE_T begy;
  38         NCURSES_SIZE_T cols;
  39         NCURSES_SIZE_T lines;
  40 } top, bot, sb, in, sep;
  41
  42 #define RINGBUFFER_SIZE 512
  43 struct rb_entry {
  44         char *msg;
  45         size_t len;
  46         int color;
  47 };
  48 static struct ringbuffer *bot_win_rb;
  49 #define NUM_LINES(len) (1 + (len) / bot.cols)
  50
  51 static unsigned scroll_position;
  52
  53 static int cmd_died, curses_active;
  54 static pid_t cmd_pid;
  55
  56 static int command_pipe = -1;
  57 static int stat_pipe = -1;
  58 static struct gui_args_info conf;
  59
  60 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  61
  62
  63 #define COLOR_STATUSBAR 52
  64 #define COLOR_COMMAND 53
  65 #define COLOR_OUTPUT 54
  66 #define COLOR_MSG 55
  67 #define COLOR_ERRMSG 56
  68 #define COLOR_WELCOME 57
  69 #define COLOR_SEPARATOR 58
  70 #define COLOR_TOP 59
  71 #define COLOR_BOT 60
  72
  73 struct gui_command {
  74         const char *key;
  75         const char *name;
  76         const char *description;
  77         void (*handler)(void);
  78 };
  79
  80 struct stat_item {
  81         char name[MAXLINE];
  82         char prefix[MAXLINE];
  83         char postfix[MAXLINE];
  84         unsigned y;
  85         unsigned x;
  86         unsigned len;
  87         int fg, bg;
  88         int align;
  89         char content[MAXLINE];
  90 };
  91
  92 static struct gui_theme theme;
  93
  94 static int _argc;
  95 static char **_argv;
  96
  97 static void com_help(void);
  98 static void com_reread_conf(void);
  99 static void com_enlarge_top_win(void);
 100 static void com_shrink_top_win(void);
 101 static void com_version(void);
 102 static void com_quit(void);
 103 static void com_refresh(void);
 104 static void com_ll_incr(void);
 105 static void com_ll_decr(void);
 106 static void com_prev_theme(void);
 107 static void com_next_theme(void);
 108 static void com_scroll_up(void);
 109 static void com_scroll_down(void);
 110 static void com_page_up(void);
 111 static void com_page_down(void);
 112 static void com_cancel_scrolling(void);
 113 static void com_scroll_top(void);
 114
 115 static struct gui_command command_list[] = {
 116         {
 117                 .key = "?",
 118                 .name = "help",
 119                 .description = "print help",
 120                 .handler = com_help
 121         }, {
 122                 .key = "+",
 123                 .name = "enlarge_win",
 124                 .description = "enlarge the top window",
 125                 .handler = com_enlarge_top_win
 126         }, {
 127                 .key = "-",
 128                 .name = "shrink_win",
 129                 .description = "shrink the top window",
 130                 .handler = com_shrink_top_win
 131         }, {
 132                 .key = "r",
 133                 .name = "reread_conf",
 134                 .description = "reread configuration file",
 135                 .handler = com_reread_conf
 136         }, {
 137                 .key = "q",
 138                 .name = "quit",
 139                 .description = "exit para_gui",
 140                 .handler = com_quit
 141         }, {
 142                 .key = "^L",
 143                 .name = "refresh",
 144                 .description = "redraw the screen",
 145                 .handler = com_refresh
 146         }, {
 147                 .key = ".",
 148                 .name = "next_theme",
 149                 .description = "switch to next theme",
 150                 .handler = com_next_theme
 151         }, {
 152                 .key = ",",
 153                 .name = "prev_theme",
 154                 .description = "switch to previous stream",
 155                 .handler = com_prev_theme
 156         }, {
 157                 .key = ">",
 158                 .name = "ll_incr",
 159                 .description = "increase loglevel (decreases verbosity)",
 160                 .handler = com_ll_incr
 161         }, {
 162                 .key = "<",
 163                 .name = "ll_decr",
 164                 .description = "decrease loglevel (increases verbosity)",
 165                 .handler = com_ll_decr
 166         }, {
 167                 .key = "V",
 168                 .name = "version",
 169                 .description = "show the para_gui version",
 170                 .handler = com_version
 171         }, {
 172                 .key = "<up>",
 173                 .name = "scroll_up",
 174                 .description = "scroll up one line",
 175                 .handler = com_scroll_up
 176         }, {
 177                 .key = "<down>",
 178                 .name = "scroll_down",
 179                 .description = "scroll down one line",
 180                 .handler = com_scroll_down
 181         }, {
 182                 .key = "<ppage>",
 183                 .name = "page_up",
 184                 .description = "scroll up one page",
 185                 .handler = com_page_up
 186         }, {
 187                 .key = "<npage>",
 188                 .name = "page_down",
 189                 .description = "scroll down one page",
 190                 .handler = com_page_down
 191         }, {
 192                 .key = "<home>",
 193                 .name = "scroll_top",
 194                 .description = "scroll to top of buffer",
 195                 .handler = com_scroll_top
 196         }, {
 197                 .key = "<end>",
 198                 .name = "cancel_scroll",
 199                 .description = "deactivate scroll mode",
 200                 .handler = com_cancel_scrolling
 201         }, {
 202                 .handler = NULL
 203         }
 204 };
 205
 206 static int find_cmd_byname(char *name)
 207 {
 208         int i;
 209
 210         for (i = 0; command_list[i].handler; i++)
 211                 if (!strcmp(command_list[i].name, name))
 212                         return i;
 213         return -1;
 214 }
 215
 216 /* taken from mutt */
 217 static char *km_keyname(int c)
 218 {
 219         static char buf[10];
 220
 221         if (c == KEY_UP) {
 222                 sprintf(buf, "<up>");
 223                 return buf;
 224         }
 225         if (c == KEY_DOWN) {
 226                 sprintf(buf, "<down>");
 227                 return buf;
 228         }
 229         if (c == KEY_LEFT) {
 230                 sprintf(buf, "<left>");
 231                 return buf;
 232         }
 233         if (c == KEY_RIGHT) {
 234                 sprintf(buf, "<right>");
 235                 return buf;
 236         }
 237         if (c == KEY_NPAGE) {
 238                 sprintf(buf, "<npage>");
 239                 return buf;
 240         }
 241         if (c == KEY_PPAGE) {
 242                 sprintf(buf, "<ppage>");
 243                 return buf;
 244         }
 245         if (c == KEY_HOME) {
 246                 sprintf(buf, "<home>");
 247                 return buf;
 248         }
 249         if (c == KEY_END) {
 250                 sprintf(buf, "<end>");
 251                 return buf;
 252         }
 253         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 254                 if (c < 0)
 255                         c += 256;
 256                 if (c < 128) {
 257                         buf[0] = '^';
 258                         buf[1] = (c + '@') & 0x7f;
 259                         buf[2] = 0;
 260                 } else
 261                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 262                                 (c >> 3) & 7, c & 7);
 263         } else if (c >= KEY_F0 && c < KEY_F(256))
 264                 sprintf(buf, "<F%d>", c - KEY_F0);
 265         else if (isprint(c))
 266                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 267         else
 268                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 269         return buf;
 270 }
 271
 272 static char *configfile_exists(void)
 273 {
 274         static char *config_file;
 275         char *tmp;
 276
 277         if (!conf.config_file_given) {
 278                 if (!config_file) {
 279                         char *home = para_homedir();
 280                         config_file = make_message("%s/.paraslash/gui.conf",
 281                                 home);
 282                         free(home);
 283                 }
 284                 tmp = config_file;
 285         } else
 286                 tmp = conf.config_file_arg;
 287         return file_exists(tmp)? tmp: NULL;
 288 }
 289
 290 /*
 291  * print num spaces to curses window
 292  */
 293 static void add_spaces(WINDOW* win, unsigned int num)
 294 {
 295         while (num > 0) {
 296                 num--;
 297                 waddstr(win, " ");
 298         }
 299 }
 300
 301 /*
 302  * print aligned string to curses window. This function always prints
 303  * exactly len chars.
 304  */
 305 static int align_str(WINDOW* win, char *str, unsigned int len,
 306                 unsigned int align)
 307 {
 308         int i, num; /* of spaces */
 309
 310         if (!win || !str)
 311                 return -1;
 312         num = len - strlen(str);
 313         if (num < 0) {
 314                 str[len] = '\0';
 315                 num = 0;
 316         }
 317         /* replace control characters by spaces */
 318         for (i = 0; i < len && str[i]; i++) {
 319                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 320                         str[i] = ' ';
 321         }
 322         if (align == LEFT) {
 323                 waddstr(win, str);
 324                 add_spaces(win, num);
 325         } else if (align == RIGHT) {
 326                 add_spaces(win, num);
 327                 waddstr(win, str);
 328         } else {
 329                 add_spaces(win, num / 2);
 330                 waddstr(win, str[0]? str: "");
 331                 add_spaces(win, num - num / 2);
 332         }
 333         return 1;
 334 }
 335
 336 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 337 {
 338         char *msg;
 339
 340         if (!curses_active)
 341                 return;
 342         wattron(in.win, COLOR_PAIR(color));
 343         PARA_VSPRINTF(fmt, msg);
 344         wmove(in.win, 0, 0);
 345         align_str(in.win, msg, sb.cols, LEFT);
 346         free(msg);
 347         wrefresh(in.win);
 348 }
 349
 350 /*
 351  * update the status bar
 352  */
 353 static void print_status_bar(void)
 354 {
 355         char *tmp;
 356
 357         if (!curses_active)
 358                 return;
 359         tmp = para_strdup(STANDARD_STATUS_BAR);
 360         wmove(sb.win, 0, 0);
 361         align_str(sb.win, tmp, sb.cols, CENTER);
 362         free(tmp);
 363         wrefresh(sb.win);
 364 }
 365
 366 /*
 367  * get the number of the oldest rbe that is (partially) visible. On return,
 368  * lines contains the sum of the number of lines of all visable entries. If the
 369  * first one is only partially visible, lines is greater than bot.lines.
 370  */
 371 static int first_visible_rbe(unsigned *lines)
 372 {
 373         int i;
 374         *lines = 0;
 375         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 376                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 377                 int rbe_lines;
 378                 if (!rbe)
 379                         return i - 1;
 380 //              fprintf(stderr, "found: %s\n", rbe->msg);
 381                 rbe_lines = NUM_LINES(rbe->len);
 382                 if (rbe_lines > bot.lines)
 383                         return -1;
 384                 *lines += rbe_lines;
 385                 if (*lines >= bot.lines)
 386                         return i;
 387         }
 388         return RINGBUFFER_SIZE - 1;
 389 }
 390
 391 static int draw_top_rbe(unsigned *lines)
 392 {
 393         unsigned len;
 394         int offset, fvr = first_visible_rbe(lines);
 395         struct rb_entry *rbe;
 396
 397         if (fvr < 0)
 398                 return -1;
 399         wmove(bot.win, 0, 0);
 400         rbe = ringbuffer_get(bot_win_rb, fvr);
 401         if (!rbe)
 402                 return -1;
 403         /* first rbe might be only partially visible */
 404         offset = (*lines - bot.lines) * bot.cols;
 405         len = strlen(rbe->msg);
 406         if (offset < 0 || len < offset)
 407                 return -1;
 408         wattron(bot.win, COLOR_PAIR(rbe->color));
 409         waddstr(bot.win, rbe->msg + offset);
 410         *lines = NUM_LINES(len - offset);
 411         return fvr;
 412 }
 413
 414 static void redraw_bot_win(void)
 415 {
 416         unsigned lines;
 417         int i;
 418
 419         wmove(bot.win, 0, 0);
 420         wclear(bot.win);
 421         i = draw_top_rbe(&lines);
 422         if (i <= 0)
 423                 goto out;
 424         while (i > 0 && lines < bot.lines) {
 425                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 426                 if (!rbe) {
 427                         lines++;
 428                         waddstr(bot.win, "\n");
 429                         continue;
 430                 }
 431                 lines += NUM_LINES(rbe->len);
 432                 wattron(bot.win, COLOR_PAIR(rbe->color));
 433                 waddstr(bot.win, "\n");
 434                 waddstr(bot.win, rbe->msg);
 435         }
 436 out:
 437         wrefresh(bot.win);
 438 }
 439
 440 static void rb_add_entry(int color, char *msg)
 441 {
 442         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 443         int x, y;
 444         new->color = color;
 445         new->len = strlen(msg);
 446         new->msg = msg;
 447         old = ringbuffer_add(bot_win_rb, new);
 448 //      fprintf(stderr, "added: %s\n", new->msg);
 449         if (old) {
 450                 free(old->msg);
 451                 free(old);
 452         }
 453         if (scroll_position) {
 454                 /* discard current scrolling, like xterm does */
 455                 scroll_position = 0;
 456                 redraw_bot_win();
 457                 return;
 458         }
 459         wattron(bot.win, COLOR_PAIR(color));
 460         getyx(bot.win, y, x);
 461         if (y || x)
 462                 waddstr(bot.win, "\n");
 463         waddstr(bot.win, msg);
 464 }
 465
 466 /*
 467  * print formated output to bot win and refresh
 468  */
 469 __printf_2_3 static void outputf(int color, const char* fmt,...)
 470 {
 471         char *msg;
 472
 473         if (!curses_active)
 474                 return;
 475         PARA_VSPRINTF(fmt, msg);
 476         rb_add_entry(color, msg);
 477         wrefresh(bot.win);
 478 }
 479
 480 static int add_output_line(char *line, __a_unused void *data)
 481 {
 482         if (!curses_active)
 483                 return 1;
 484         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 485         return 1;
 486 }
 487
 488 static int loglevel;
 489
 490 __printf_2_3 void para_log(int ll, const char *fmt,...)
 491 {
 492         int color;
 493         char *msg;
 494
 495         if (ll < loglevel || !curses_active)
 496                 return;
 497         switch (ll) {
 498                 case LL_DEBUG:
 499                 case LL_INFO:
 500                 case LL_NOTICE:
 501                         color = COLOR_MSG;
 502                         break;
 503                 default:
 504                         color = COLOR_ERRMSG;
 505         }
 506         PARA_VSPRINTF(fmt, msg);
 507         chop(msg);
 508         rb_add_entry(color, msg);
 509         wrefresh(bot.win);
 510 }
 511
 512 static void setup_signal_handling(void)
 513 {
 514         signal_pipe = para_signal_init();
 515         para_install_sighandler(SIGINT);
 516         para_install_sighandler(SIGTERM);
 517         para_install_sighandler(SIGCHLD);
 518         para_install_sighandler(SIGWINCH);
 519         para_install_sighandler(SIGUSR1);
 520         para_sigaction(SIGHUP, SIG_IGN);
 521 }
 522
 523 __noreturn static void do_exit(int ret)
 524 {
 525         para_sigaction(SIGTERM, SIG_IGN);
 526         kill(0, SIGTERM);
 527         exit(ret);
 528 }
 529
 530 static void shutdown_curses(void)
 531 {
 532         if (!curses_active)
 533                 return;
 534         def_prog_mode();
 535         curses_active = 0;
 536         endwin();
 537 }
 538
 539 __noreturn static void finish(int ret)
 540 {
 541         shutdown_curses();
 542         do_exit(ret);
 543 }
 544
 545 /*
 546  * exit curses and print given message to stdout/stderr
 547  */
 548 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 549 {
 550         va_list argp;
 551         FILE *outfd = ret? stderr: stdout;
 552
 553         shutdown_curses();
 554         va_start(argp, fmt);
 555         vfprintf(outfd, fmt, argp);
 556         va_end(argp);
 557         do_exit(ret);
 558 }
 559
 560 static void print_welcome(void)
 561 {
 562         if (loglevel > LL_NOTICE)
 563                 return;
 564         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 565                 " \"" CODENAME "\". Theme: %s", theme.name);
 566         wclrtoeol(bot.win);
 567 }
 568
 569 /*
 570  * init all windows
 571  */
 572 static void init_wins(int top_lines)
 573 {
 574         int i;
 575
 576         top.lines = top_lines;
 577         top.cols = COLS;
 578         top.begy = 0;
 579         top.begx = 0;
 580
 581         bot.lines = LINES - top.lines - 3;
 582         bot.cols = COLS;
 583         bot.begy = top.lines + 1;
 584         bot.begx = 0;
 585
 586         sb.lines = 1;
 587         sb.cols = COLS;
 588         sb.begy = LINES - 2;
 589         sb.begx = 0;
 590
 591         in.lines = 1;
 592         in.cols = COLS;
 593         in.begy = LINES - 1;
 594         in.begx = 0;
 595
 596         sep.lines = 1;
 597         sep.cols = COLS;
 598         sep.begy = top.lines;
 599         sep.begx = 0;
 600
 601         assume_default_colors(theme.default_fg, theme.default_bg);
 602         if (top.win) {
 603                 mvwin(top.win, top.begy, top.begx);
 604                 wresize(top.win, top.lines, top.cols);
 605
 606                 mvwin(sb.win, sb.begy, sb.begx);
 607                 wresize(sb.win, sb.lines, sb.cols);
 608
 609                 mvwin(sep.win, sep.begy, sep.begx);
 610                 wresize(sep.win, sep.lines, sep.cols);
 611
 612                 mvwin(bot.win, bot.begy, bot.begx);
 613                 wresize(bot.win, bot.lines, bot.cols);
 614
 615                 mvwin(in.win, in.begy, in.begx);
 616                 wresize(in.win, in.lines, in.cols);
 617         } else {
 618                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 619                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 620                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 621                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 622                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 623                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 624                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 625                 wclear(bot.win);
 626                 wclear(sb.win);
 627                 wclear(in.win);
 628                 scrollok(bot.win, 1);
 629                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 630                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 631                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 632                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 633                 nodelay(top.win, 1);
 634                 nodelay(bot.win, 1);
 635                 nodelay(sb.win, 1);
 636                 nodelay(in.win, 0);
 637
 638                 keypad(top.win, 1);
 639                 keypad(bot.win, 1);
 640                 keypad(sb.win, 1);
 641                 keypad(in.win, 1);
 642                 print_status_bar();
 643         }
 644         wmove(sep.win, 0, 0);
 645         for (i = 1; i <= COLS; i++)
 646                 waddstr(sep.win, theme.sep_str);
 647         wclear(top.win);
 648         //wclear(bot.win);
 649         wnoutrefresh(top.win);
 650         wnoutrefresh(bot.win);
 651         //wnoutrefresh(sb.win);
 652         print_status_bar();
 653         wnoutrefresh(in.win);
 654         wnoutrefresh(sep.win);
 655         doupdate();
 656 }
 657
 658 /*
 659  * Print stat item #i to curses window
 660  */
 661 static void print_stat_item(int i)
 662 {
 663         char *tmp;
 664         struct stat_item_data d = theme.data[i];
 665         char *c = stat_content[i];
 666
 667         if (!curses_active || !d.len || !c)
 668                 return;
 669         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 670         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 671         wrefresh(top.win);
 672         wattron(top.win, COLOR_PAIR(i + 1));
 673         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 674         free(tmp);
 675         wrefresh(top.win);
 676 }
 677
 678 static int update_item(int item_num, char *buf)
 679 {
 680         char **c = stat_content + item_num;
 681
 682         free(*c);
 683         if (buf && buf[0])
 684                 goto dup;
 685         switch (item_num) {
 686         case SI_ARTIST:
 687                 *c = para_strdup("(artist tag not set)");
 688                 goto print;
 689         case SI_TITLE:
 690                 *c = para_strdup("(title tag not set)");
 691                 goto print;
 692         case SI_YEAR:
 693                 *c = para_strdup("????");
 694                 goto print;
 695         case SI_ALBUM:
 696                 *c = para_strdup("(album tag not set)");
 697                 goto print;
 698         case SI_COMMENT:
 699                 *c = para_strdup("(comment tag not set)");
 700                 goto print;
 701         }
 702 dup:
 703         *c = para_strdup(buf);
 704 print:
 705         print_stat_item(item_num);
 706         return 1;
 707 }
 708
 709 static int read_stat_pipe(fd_set *rfds)
 710 {
 711         static char *buf;
 712         static int bufsize, loaded;
 713         int ret, ret2;
 714         size_t sz;
 715
 716         if (stat_pipe < 0)
 717                 return 0;
 718         if (loaded >= bufsize) {
 719                 if (bufsize > 1000 * 1000) {
 720                         loaded = 0;
 721                         return 0;
 722                 }
 723                 bufsize += bufsize + 1000;
 724                 buf = para_realloc(buf, bufsize);
 725         }
 726         assert(loaded < bufsize);
 727         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 728                 rfds, &sz);
 729         loaded += sz;
 730         ret2 = for_each_stat_item(buf, loaded, update_item);
 731         if (ret < 0 || ret2 < 0) {
 732                 loaded = 0;
 733                 return ret2 < 0? ret2 : ret;
 734         }
 735         sz = ret2; /* what is left */
 736         if (sz > 0 && sz < loaded)
 737                 memmove(buf, buf + loaded - sz, sz);
 738         loaded = sz;
 739         return 1;
 740 }
 741
 742 static void print_all_items(void)
 743 {
 744         int i;
 745
 746         if (!curses_active)
 747                 return;
 748         FOR_EACH_STATUS_ITEM(i)
 749                 print_stat_item(i);
 750 }
 751
 752 static void clear_all_items(void)
 753 {
 754         int i;
 755
 756         FOR_EACH_STATUS_ITEM(i) {
 757                 free(stat_content[i]);
 758                 stat_content[i] = para_strdup("");
 759         }
 760 }
 761
 762 static void init_pair_or_die(short pair, short f, short b)
 763 {
 764         if (init_pair(pair, f, b) == ERR)
 765                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 766 }
 767
 768 static void init_colors_or_die(void)
 769 {
 770         int i;
 771
 772         if (!has_colors())
 773                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 774         if (start_color() == ERR)
 775                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 776         FOR_EACH_STATUS_ITEM(i)
 777                 if (theme.data[i].len)
 778                         init_pair_or_die(i + 1, theme.data[i].fg,
 779                                 theme.data[i].bg);
 780         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 781         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 782         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 783         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 784         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 785         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 786         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 787         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 788         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 789 }
 790
 791 /* (Re-)initialize the curses library. */
 792 static void init_curses(void)
 793 {
 794         curses_active = 1;
 795         if (top.win && refresh() == ERR) /* refesh is really needed */
 796                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 797         if (LINES < theme.lines_min || COLS < theme.cols_min)
 798                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 799                         " (need at least %dx%d)\n", COLS, LINES,
 800                         theme.cols_min, theme.lines_min);
 801         curs_set(0); /* make cursor invisible, ignore errors */
 802         nonl(); /* do not NL->CR/NL on output, always returns OK */
 803         /* don't echo input */
 804         if (noecho() == ERR)
 805                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 806         /* take input chars one at a time, no wait for \n */
 807         if (cbreak() == ERR)
 808                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 809         init_colors_or_die();
 810         clear(); /* ignore non-fatal errors */
 811         init_wins(theme.top_lines_default);
 812         print_all_items();
 813         // noecho(); /* don't echo input */
 814 }
 815
 816 static void check_sigchld(void)
 817 {
 818         int ret;
 819         pid_t pid;
 820 reap_next_child:
 821         ret = para_reap_child(&pid);
 822         if (ret <= 0)
 823                 return;
 824         if (pid == cmd_pid) {
 825                 cmd_pid = 0;
 826                 cmd_died = 1;
 827         }
 828         goto reap_next_child;
 829 }
 830
 831 /*
 832  * This sucker modifies its first argument. *handler and *arg are
 833  * pointers to 0-terminated strings (inside line). Crap.
 834  */
 835 static int split_key_map(char *line, char **handler, char **arg)
 836 {
 837         if (!(*handler = strchr(line + 1, ':')))
 838                 goto err_out;
 839         **handler = '\0';
 840         (*handler)++;
 841         if (!(*arg = strchr(*handler, ':')))
 842                 goto err_out;
 843         **arg = '\0';
 844         (*arg)++;
 845         return 1;
 846 err_out:
 847         return 0;
 848 }
 849
 850 static int check_key_map_args(void)
 851 {
 852         char *s;
 853         int i, ret = -1;
 854         char *tmp = NULL, *handler, *arg;
 855
 856         for (i = 0; i < conf.key_map_given; ++i) {
 857                 s = conf.key_map_arg[i];
 858                 if (!(*s))
 859                         goto err_out;
 860                 free(tmp);
 861                 tmp = para_strdup(s);
 862                 if (!split_key_map(tmp, &handler, &arg))
 863                         goto err_out;
 864                 if (strlen(handler) != 1)
 865                         goto err_out;
 866                 if (*handler != 'x'
 867                         && *handler != 'd'
 868                         && *handler != 'i'
 869                         && *handler != 'p')
 870                         goto err_out;
 871                 if (*handler != 'i')
 872                         continue;
 873                 if (find_cmd_byname(arg) < 0)
 874                         goto err_out;
 875         }
 876         ret = 0;
 877 err_out:
 878         free(tmp);
 879         return ret;
 880 }
 881
 882 /*
 883  * React to various signal-related events
 884  */
 885 static void handle_signal(int sig)
 886 {
 887         switch (sig) {
 888         case SIGTERM:
 889                 msg_n_exit(EXIT_FAILURE,
 890                         "only the good die young (caught SIGTERM))\n");
 891                 return;
 892         case SIGWINCH:
 893                 if (curses_active) {
 894                         shutdown_curses();
 895                         init_curses();
 896                         redraw_bot_win();
 897                 }
 898                 return;
 899         case SIGINT:
 900                 PARA_WARNING_LOG("caught SIGINT, reset");
 901                 /* Nothing to do. SIGINT killed our child which gets noticed
 902                  * by do_select and resets everything.
 903                  */
 904                 return;
 905         case SIGUSR1:
 906                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 907                 com_reread_conf();
 908                 return;
 909         case SIGCHLD:
 910                 check_sigchld();
 911                 return;
 912         }
 913 }
 914
 915 static int open_stat_pipe(void)
 916 {
 917         static int init = 1;
 918         int ret, fds[3] = {0, 1, 0};
 919         pid_t pid;
 920
 921         if (init)
 922                 init = 0;
 923         else
 924                 /*
 925                  * Sleep a bit to avoid a busy loop. As the call to sleep() may
 926                  * be interrupted by SIGCHLD, we simply wait until the call
 927                  * succeeds.
 928                  */
 929                 while (sleep(2))
 930                         ; /* nothing */
 931         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 932         if (ret < 0)
 933                 return ret;
 934         ret = mark_fd_nonblocking(fds[1]);
 935         if (ret >= 0)
 936                 return fds[1];
 937         close(fds[1]);
 938         return ret;
 939 }
 940
 941 /*
 942  * This is the core select loop. Besides the (internal) signal
 943  * pipe, the following other fds are checked according to the mode:
 944  *
 945  * GETCH_MODE: check stdin, return when key is pressed
 946  *
 947  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 948  * of output has been read or when other end has closed command pipe or
 949  * when any key is pressed.
 950  *
 951  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 952  * is running. During that time curses is disabled.  Returns when
 953  * cmd_pid == 0.
 954  */
 955 static int do_select(int mode)
 956 {
 957         fd_set rfds;
 958         int ret;
 959         int max_fileno;
 960         char command_buf[4096] = "";
 961         int cbo = 0; /* command buf offset */
 962         struct timeval tv;
 963 repeat:
 964         tv.tv_sec = conf.timeout_arg  / 1000;
 965         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 966 //      ret = refresh_status();
 967         FD_ZERO(&rfds);
 968         max_fileno = 0;
 969         if (stat_pipe < 0)
 970                 stat_pipe = open_stat_pipe();
 971         if (stat_pipe >= 0)
 972                 para_fd_set(stat_pipe, &rfds, &max_fileno);
 973         /* signal pipe */
 974         para_fd_set(signal_pipe, &rfds, &max_fileno);
 975         /* command pipe only for COMMAND_MODE */
 976         if (command_pipe >= 0 && mode == COMMAND_MODE)
 977                 para_fd_set(command_pipe, &rfds, &max_fileno);
 978         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 979         if (ret <= 0)
 980                 goto check_return; /* skip fd checks */
 981         /* signals */
 982         ret = para_next_signal(&rfds);
 983         if (ret > 0)
 984                 handle_signal(ret);
 985         /* read command pipe if ready */
 986         if (command_pipe >= 0 && mode == COMMAND_MODE) {
 987                 size_t sz;
 988                 ret = read_nonblock(command_pipe, command_buf + cbo,
 989                         sizeof(command_buf) - 1 - cbo, &rfds, &sz);
 990                 cbo += sz;
 991                 sz = cbo;
 992                 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
 993                 if (sz != cbo)
 994                         wrefresh(bot.win);
 995                 if (ret < 0) {
 996                         PARA_NOTICE_LOG("closing command pipe: %s",
 997                                 para_strerror(-ret));
 998                         close(command_pipe);
 999                         command_pipe = -1;
1000                         return 0;
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 (command_pipe) {
1020                                 close(command_pipe);
1021                                 command_pipe = -1;
1022                         }
1023                         if (cmd_pid)
1024                                 kill(cmd_pid, SIGTERM);
1025                         return -1;
1026                 }
1027                 break;
1028         case GETCH_MODE:
1029                 ret = wgetch(top.win);
1030                 if (ret != ERR && ret != KEY_RESIZE)
1031                         return ret;
1032                 break;
1033         case EXTERNAL_MODE:
1034                 if (cmd_died) {
1035                         cmd_died = 0;
1036                         return 0;
1037                 }
1038         }
1039         goto repeat;
1040 }
1041
1042 /*
1043  * read from command pipe and print data to bot window
1044  */
1045 static int send_output(void)
1046 {
1047         int ret;
1048
1049         if (command_pipe < 0)
1050                 return 0;
1051         ret = mark_fd_nonblocking(command_pipe);
1052         if (ret < 0) {
1053                 close(command_pipe);
1054                 return ret;
1055         }
1056         if (do_select(COMMAND_MODE) >= 0)
1057                 PARA_INFO_LOG("command complete");
1058         else
1059                 PARA_NOTICE_LOG("command aborted");
1060         print_in_bar(COLOR_MSG, " ");
1061         return 1;
1062 }
1063
1064 static int client_cmd_cmdline(char *cmd)
1065 {
1066         int ret, fds[3] = {0, 1, 0};
1067         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1068
1069         outputf(COLOR_COMMAND, "%s", c);
1070         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1071         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1072         free(c);
1073         if (ret < 0)
1074                 return -1;
1075         command_pipe = fds[1];
1076         return send_output();
1077 }
1078
1079 /*
1080  * exec command and print output to bot win
1081  */
1082 static int display_cmd(char *cmd)
1083 {
1084         int fds[3] = {0, 1, 0};
1085
1086         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1087         outputf(COLOR_COMMAND, "%s", cmd);
1088         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1089                 return -1;
1090         command_pipe = fds[1];
1091         return send_output();
1092 }
1093
1094 /*
1095  * shutdown curses and stat pipe before executing external commands
1096  */
1097 static int external_cmd(char *cmd)
1098 {
1099         int fds[3] = {-1, -1, -1};
1100
1101         if (cmd_pid)
1102                 return -1;
1103         shutdown_curses();
1104         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1105         cmd_died = 0;
1106         do_select(EXTERNAL_MODE);
1107         init_curses();
1108         return 0;
1109 }
1110
1111 static void print_scroll_msg(void)
1112 {
1113         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1114         int first_rbe = first_visible_rbe(&lines_total);
1115         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1116                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1117 }
1118
1119 static void com_scroll_top(void)
1120 {
1121         int i = RINGBUFFER_SIZE - 1;
1122         unsigned lines = 0;
1123
1124         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1125                 i--;
1126         /* i is oldest entry */
1127         for (; lines < bot.lines && i >= 0; i--) {
1128                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1129                 if (!rbe)
1130                         break;
1131                 lines += NUM_LINES(strlen(rbe->msg));
1132         }
1133         i++;
1134         if (lines > 0 && scroll_position != i) {
1135                 scroll_position = i;
1136                 redraw_bot_win();
1137                 print_scroll_msg();
1138                 return;
1139         }
1140         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1141 }
1142
1143 static void com_cancel_scrolling(void)
1144 {
1145
1146         if (scroll_position == 0) {
1147                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1148                 return;
1149         }
1150         scroll_position = 0;
1151         redraw_bot_win();
1152 }
1153
1154 static void com_page_down(void)
1155 {
1156         unsigned lines = 0;
1157         int i = scroll_position;
1158         while (lines < bot.lines && --i > 0) {
1159                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1160                 if (!rbe)
1161                         break;
1162                 lines += NUM_LINES(strlen(rbe->msg));
1163         }
1164         if (lines) {
1165                 scroll_position = i;
1166                 redraw_bot_win();
1167                 print_scroll_msg();
1168                 return;
1169         }
1170         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1171 }
1172
1173 static void com_page_up(void)
1174 {
1175         unsigned lines;
1176         int fvr = first_visible_rbe(&lines);
1177
1178         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1179                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1180                 return;
1181         }
1182         scroll_position = fvr + 1;
1183         for (; scroll_position > 0; scroll_position--) {
1184                 first_visible_rbe(&lines);
1185                 if (lines == bot.lines)
1186                         break;
1187         }
1188         redraw_bot_win();
1189         print_scroll_msg();
1190 }
1191
1192 static void com_scroll_down(void)
1193 {
1194         struct rb_entry *rbe;
1195         int rbe_lines;
1196
1197         if (!scroll_position) {
1198                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1199                 return;
1200         }
1201         scroll_position--;
1202         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1203         rbe_lines = NUM_LINES(rbe->len);
1204         wscrl(bot.win, rbe_lines);
1205         wmove(bot.win, bot.lines - rbe_lines, 0);
1206         wattron(bot.win, COLOR_PAIR(rbe->color));
1207         waddstr(bot.win, rbe->msg);
1208         wrefresh(bot.win);
1209         print_scroll_msg();
1210 }
1211
1212 static void com_scroll_up(void)
1213 {
1214         struct rb_entry *rbe = NULL;
1215         unsigned lines;
1216         int i, first_rbe, num_scroll;
1217
1218         /* the entry that is going to vanish */
1219         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1220         if (!rbe)
1221                 goto err_out;
1222         num_scroll = NUM_LINES(rbe->len);
1223         first_rbe = first_visible_rbe(&lines);
1224         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1225                 goto err_out;
1226         scroll_position++;
1227         wscrl(bot.win, -num_scroll);
1228         i = draw_top_rbe(&lines);
1229         if (i < 0)
1230                 goto err_out;
1231         while (i > 0 && lines < num_scroll) {
1232                 int rbe_lines;
1233                 rbe = ringbuffer_get(bot_win_rb, --i);
1234                 if (!rbe)
1235                         break;
1236                 rbe_lines = NUM_LINES(rbe->len);
1237                 lines += rbe_lines;
1238 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1239                 wattron(bot.win, COLOR_PAIR(rbe->color));
1240                 waddstr(bot.win, "\n");
1241                 waddstr(bot.win, rbe->msg);
1242                 if (!i)
1243                         break;
1244                 i--;
1245         }
1246         wrefresh(bot.win);
1247         print_scroll_msg();
1248         return;
1249 err_out:
1250         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1251 }
1252
1253 static void com_ll_decr(void)
1254 {
1255         if (loglevel <= LL_DEBUG) {
1256                 print_in_bar(COLOR_ERRMSG,
1257                         "loglevel already at maximal verbosity\n");
1258                 return;
1259         }
1260         loglevel--;
1261         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1262 }
1263
1264 static void com_ll_incr(void)
1265 {
1266         if (loglevel >= LL_EMERG) {
1267                 print_in_bar(COLOR_ERRMSG,
1268                         "loglevel already at minimal verbosity\n");
1269                 return;
1270         }
1271         loglevel++;
1272         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1273 }
1274
1275 /*
1276  * reread configuration, terminate on errors
1277  */
1278 static void com_reread_conf(void)
1279 {
1280         char *cf =configfile_exists();
1281         struct gui_cmdline_parser_params params = {
1282                 .override = 1,
1283                 .initialize = 1,
1284                 .check_required = 0,
1285                 .check_ambiguity = 0,
1286                 .print_errors = 0,
1287         };
1288
1289         if (!cf) {
1290                 PARA_WARNING_LOG("there is no configuration to read");
1291                 return;
1292         }
1293         PARA_INFO_LOG("rereading command line options and config file");
1294         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1295         if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1296                 PARA_EMERG_LOG("errors in config file");
1297                 finish(EXIT_FAILURE);
1298         }
1299         PARA_NOTICE_LOG("config file reloaded");
1300         if (check_key_map_args() < 0)
1301                 finish(EXIT_FAILURE);
1302 }
1303
1304 static void com_help(void)
1305 {
1306         int i;
1307
1308         for (i = 0; i < conf.key_map_given; ++i) {
1309                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1310                 const char *handler_text = "???", *desc = NULL;
1311
1312                 if (!split_key_map(tmp, &handler, &arg)) {
1313                         free(tmp);
1314                         return;
1315                 }
1316                 switch (*handler) {
1317                         case 'i':
1318                                 handler_text = "internal";
1319                                 desc = command_list[find_cmd_byname(arg)].description;
1320                                 break;
1321                         case 'x': handler_text = "external"; break;
1322                         case 'd': handler_text = "display "; break;
1323                         case 'p': handler_text = "para    "; break;
1324                 }
1325                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1326                         strlen(arg) < 8? "\t" : "",
1327                         desc? desc : "");
1328                 free(tmp);
1329         }
1330         for (i = 0; command_list[i].handler; i++) {
1331                 struct gui_command gc = command_list[i];
1332
1333                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1334                         strlen(gc.name) < 8? "\t" : "",
1335                         gc.description);
1336         }
1337         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1338                 "for more info");
1339 }
1340
1341 static void com_shrink_top_win(void)
1342 {
1343         if (top.lines <= theme.top_lines_min) {
1344                 PARA_WARNING_LOG("can not decrease top window");
1345                 return;
1346         }
1347         init_wins(top.lines - 1);
1348         wclear(top.win);
1349         print_all_items();
1350         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1351 }
1352
1353 static void com_enlarge_top_win(void)
1354 {
1355         if (bot.lines < 3) {
1356                 PARA_WARNING_LOG("can not increase top window");
1357                 return;
1358         }
1359         init_wins(top.lines + 1);
1360         wclear(top.win);
1361         print_all_items();
1362         print_in_bar(COLOR_MSG, "increased top window");
1363 }
1364
1365 static void com_version(void)
1366 {
1367         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1368                 CODENAME "\"");
1369 }
1370
1371 __noreturn static void com_quit(void)
1372 {
1373         finish(0);
1374 }
1375
1376 static void com_refresh(void)
1377 {
1378         shutdown_curses();
1379         init_curses();
1380 }
1381
1382 static void change_theme(int next)
1383 {
1384         if (next)
1385                 next_theme(&theme);
1386         else
1387                 prev_theme(&theme);
1388         /* This seems to be needed twice, why? */
1389         com_refresh();
1390         com_refresh();
1391         PARA_NOTICE_LOG("new theme: %s", theme.name);
1392 }
1393
1394 static void com_next_theme(void)
1395 {
1396         change_theme(1);
1397 }
1398
1399 static void com_prev_theme(void)
1400 {
1401         change_theme(0);
1402 }
1403
1404
1405 static void handle_command(int c)
1406 {
1407         int i;
1408
1409         /* first check user's key bindings */
1410         for (i = 0; i < conf.key_map_given; ++i) {
1411                 char *tmp, *handler, *arg;
1412
1413                 tmp = para_strdup(conf.key_map_arg[i]);
1414                 if (!split_key_map(tmp, &handler, &arg)) {
1415                         free(tmp);
1416                         return;
1417                 }
1418                 if (strcmp(tmp, km_keyname(c))) {
1419                         free(tmp);
1420                         continue;
1421                 }
1422                 if (*handler == 'd')
1423                         display_cmd(arg);
1424                 else if (*handler == 'x')
1425                         external_cmd(arg);
1426                 else if (*handler == 'p')
1427                         client_cmd_cmdline(arg);
1428                 else if (*handler == 'i') {
1429                         int num = find_cmd_byname(arg);
1430                         if (num >= 0)
1431                                 command_list[num].handler();
1432                 }
1433                 free(tmp);
1434                 return;
1435         }
1436         /* not found, check internal key bindings */
1437         for (i = 0; command_list[i].handler; i++) {
1438                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1439                         command_list[i].handler();
1440                         return;
1441                 }
1442         }
1443         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1444                 km_keyname(c));
1445 }
1446
1447 int main(int argc, char *argv[])
1448 {
1449         int ret;
1450         char *cf;
1451
1452         _argc = argc;
1453         _argv = argv;
1454
1455         if (gui_cmdline_parser(argc, argv, &conf) != 0)
1456                 exit(EXIT_FAILURE);
1457         HANDLE_VERSION_FLAG("gui", conf);
1458         cf = configfile_exists();
1459         if (!cf && conf.config_file_given) {
1460                 fprintf(stderr, "can not read config file %s\n",
1461                         conf.config_file_arg);
1462                 exit(EXIT_FAILURE);
1463         }
1464         if (cf) {
1465                 struct gui_cmdline_parser_params params = {
1466                         .override = 0,
1467                         .initialize = 0,
1468                         .check_required = 0,
1469                         .check_ambiguity = 0,
1470                         .print_errors = 1,
1471                 };
1472                 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1473                         exit(EXIT_FAILURE);
1474         }
1475         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1476         if (check_key_map_args() < 0) {
1477                 fprintf(stderr, "invalid key map\n");
1478                 exit(EXIT_FAILURE);
1479         }
1480         init_theme_or_die(conf.theme_arg, &theme);
1481         top.lines = theme.top_lines_default;
1482         setup_signal_handling();
1483         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1484         initscr(); /* needed only once, always successful */
1485         init_curses();
1486         print_welcome();
1487         for (;;) {
1488                 print_status_bar();
1489                 ret = do_select(GETCH_MODE);
1490                 if (!ret)
1491                         continue;
1492                 print_in_bar(COLOR_MSG, " ");
1493                 handle_command(ret);
1494         }
1495 }