gui.c

   1 /*
   2  * Copyright (C) 1998-2012 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
  14 #include "gui.cmdline.h"
  15 #include "para.h"
  16 #include "gui.h"
  17 #include "string.h"
  18 #include "ringbuffer.h"
  19 #include "fd.h"
  20 #include "error.h"
  21 #include "list.h"
  22 #include "sched.h"
  23 #include "signal.h"
  24 #include "version.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         size_t begx;
  37         size_t begy;
  38         size_t cols;
  39         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 __noreturn 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         va_list ap;
 340
 341         if (!curses_active)
 342                 return;
 343         wattron(in.win, COLOR_PAIR(color));
 344         va_start(ap, fmt);
 345         xvasprintf(&msg, fmt, ap);
 346         va_end(ap);
 347         wmove(in.win, 0, 0);
 348         align_str(in.win, msg, sb.cols, LEFT);
 349         free(msg);
 350         wrefresh(in.win);
 351 }
 352
 353 /*
 354  * update the status bar
 355  */
 356 static void print_status_bar(void)
 357 {
 358         char *tmp;
 359
 360         if (!curses_active)
 361                 return;
 362         tmp = para_strdup(STANDARD_STATUS_BAR);
 363         wmove(sb.win, 0, 0);
 364         align_str(sb.win, tmp, sb.cols, CENTER);
 365         free(tmp);
 366         wrefresh(sb.win);
 367 }
 368
 369 /*
 370  * get the number of the oldest rbe that is (partially) visible. On return,
 371  * lines contains the sum of the number of lines of all visable entries. If the
 372  * first one is only partially visible, lines is greater than bot.lines.
 373  */
 374 static int first_visible_rbe(unsigned *lines)
 375 {
 376         int i;
 377         *lines = 0;
 378         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 379                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 380                 int rbe_lines;
 381                 if (!rbe)
 382                         return i - 1;
 383 //              fprintf(stderr, "found: %s\n", rbe->msg);
 384                 rbe_lines = NUM_LINES(rbe->len);
 385                 if (rbe_lines > bot.lines)
 386                         return -1;
 387                 *lines += rbe_lines;
 388                 if (*lines >= bot.lines)
 389                         return i;
 390         }
 391         return RINGBUFFER_SIZE - 1;
 392 }
 393
 394 static int draw_top_rbe(unsigned *lines)
 395 {
 396         unsigned len;
 397         int offset, fvr = first_visible_rbe(lines);
 398         struct rb_entry *rbe;
 399
 400         if (fvr < 0)
 401                 return -1;
 402         wmove(bot.win, 0, 0);
 403         rbe = ringbuffer_get(bot_win_rb, fvr);
 404         if (!rbe)
 405                 return -1;
 406         len = strlen(rbe->msg);
 407         if (*lines > bot.lines) {
 408                 /* first rbe is only partially visible */
 409                 offset = (*lines - bot.lines) * bot.cols;
 410                 assert(offset <= len);
 411         } else
 412                 offset = 0;
 413         wattron(bot.win, COLOR_PAIR(rbe->color));
 414         waddstr(bot.win, rbe->msg + offset);
 415         *lines = NUM_LINES(len - offset);
 416         return fvr;
 417 }
 418
 419 static void redraw_bot_win(void)
 420 {
 421         unsigned lines;
 422         int i;
 423
 424         wmove(bot.win, 0, 0);
 425         wclear(bot.win);
 426         i = draw_top_rbe(&lines);
 427         if (i <= 0)
 428                 goto out;
 429         while (i > 0 && lines < bot.lines) {
 430                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 431                 if (!rbe) {
 432                         lines++;
 433                         waddstr(bot.win, "\n");
 434                         continue;
 435                 }
 436                 lines += NUM_LINES(rbe->len);
 437                 wattron(bot.win, COLOR_PAIR(rbe->color));
 438                 waddstr(bot.win, "\n");
 439                 waddstr(bot.win, rbe->msg);
 440         }
 441 out:
 442         wrefresh(bot.win);
 443 }
 444
 445 static void rb_add_entry(int color, char *msg)
 446 {
 447         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 448         int x, y;
 449         new->color = color;
 450         new->len = strlen(msg);
 451         new->msg = msg;
 452         old = ringbuffer_add(bot_win_rb, new);
 453 //      fprintf(stderr, "added: %s\n", new->msg);
 454         if (old) {
 455                 free(old->msg);
 456                 free(old);
 457         }
 458         if (scroll_position) {
 459                 /* discard current scrolling, like xterm does */
 460                 scroll_position = 0;
 461                 redraw_bot_win();
 462                 return;
 463         }
 464         wattron(bot.win, COLOR_PAIR(color));
 465         getyx(bot.win, y, x);
 466         if (y || x)
 467                 waddstr(bot.win, "\n");
 468         waddstr(bot.win, msg);
 469 }
 470
 471 /*
 472  * print formated output to bot win and refresh
 473  */
 474 __printf_2_3 static void outputf(int color, const char* fmt,...)
 475 {
 476         char *msg;
 477         va_list ap;
 478
 479         if (!curses_active)
 480                 return;
 481         va_start(ap, fmt);
 482         xvasprintf(&msg, fmt, ap);
 483         va_end(ap);
 484         rb_add_entry(color, msg);
 485         wrefresh(bot.win);
 486 }
 487
 488 static int add_output_line(char *line, __a_unused void *data)
 489 {
 490         if (!curses_active)
 491                 return 1;
 492         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 493         return 1;
 494 }
 495
 496 static int loglevel;
 497
 498 __printf_2_3 void curses_log(int ll, const char *fmt,...)
 499 {
 500         int color;
 501         char *msg;
 502         va_list ap;
 503
 504         if (ll < loglevel || !curses_active)
 505                 return;
 506         switch (ll) {
 507                 case LL_DEBUG:
 508                 case LL_INFO:
 509                 case LL_NOTICE:
 510                         color = COLOR_MSG;
 511                         break;
 512                 default:
 513                         color = COLOR_ERRMSG;
 514         }
 515         va_start(ap, fmt);
 516         xvasprintf(&msg, fmt, ap);
 517         va_end(ap);
 518         chop(msg);
 519         rb_add_entry(color, msg);
 520         wrefresh(bot.win);
 521 }
 522 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 523
 524 static void setup_signal_handling(void)
 525 {
 526         signal_pipe = para_signal_init();
 527         para_install_sighandler(SIGINT);
 528         para_install_sighandler(SIGTERM);
 529         para_install_sighandler(SIGCHLD);
 530         para_install_sighandler(SIGWINCH);
 531         para_install_sighandler(SIGUSR1);
 532         para_sigaction(SIGHUP, SIG_IGN);
 533 }
 534
 535 __noreturn static void do_exit(int ret)
 536 {
 537         para_sigaction(SIGTERM, SIG_IGN);
 538         kill(0, SIGTERM);
 539         exit(ret);
 540 }
 541
 542 static void shutdown_curses(void)
 543 {
 544         if (!curses_active)
 545                 return;
 546         def_prog_mode();
 547         curses_active = 0;
 548         endwin();
 549 }
 550
 551 __noreturn static void finish(int ret)
 552 {
 553         shutdown_curses();
 554         do_exit(ret);
 555 }
 556
 557 /*
 558  * exit curses and print given message to stdout/stderr
 559  */
 560 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 561 {
 562         va_list argp;
 563         FILE *outfd = ret? stderr: stdout;
 564
 565         shutdown_curses();
 566         va_start(argp, fmt);
 567         vfprintf(outfd, fmt, argp);
 568         va_end(argp);
 569         do_exit(ret);
 570 }
 571
 572 static void print_welcome(void)
 573 {
 574         if (loglevel > LL_NOTICE)
 575                 return;
 576         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 577                 " \"" CODENAME "\". Theme: %s", theme.name);
 578         wclrtoeol(bot.win);
 579 }
 580
 581 /*
 582  * init all windows
 583  */
 584 static void init_wins(int top_lines)
 585 {
 586         int i;
 587
 588         top.lines = top_lines;
 589         top.cols = COLS;
 590         top.begy = 0;
 591         top.begx = 0;
 592
 593         bot.lines = LINES - top.lines - 3;
 594         bot.cols = COLS;
 595         bot.begy = top.lines + 1;
 596         bot.begx = 0;
 597
 598         sb.lines = 1;
 599         sb.cols = COLS;
 600         sb.begy = LINES - 2;
 601         sb.begx = 0;
 602
 603         in.lines = 1;
 604         in.cols = COLS;
 605         in.begy = LINES - 1;
 606         in.begx = 0;
 607
 608         sep.lines = 1;
 609         sep.cols = COLS;
 610         sep.begy = top.lines;
 611         sep.begx = 0;
 612
 613         assume_default_colors(theme.default_fg, theme.default_bg);
 614         if (top.win) {
 615                 mvwin(top.win, top.begy, top.begx);
 616                 wresize(top.win, top.lines, top.cols);
 617
 618                 mvwin(sb.win, sb.begy, sb.begx);
 619                 wresize(sb.win, sb.lines, sb.cols);
 620
 621                 mvwin(sep.win, sep.begy, sep.begx);
 622                 wresize(sep.win, sep.lines, sep.cols);
 623
 624                 mvwin(bot.win, bot.begy, bot.begx);
 625                 wresize(bot.win, bot.lines, bot.cols);
 626
 627                 mvwin(in.win, in.begy, in.begx);
 628                 wresize(in.win, in.lines, in.cols);
 629         } else {
 630                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 631                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 632                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 633                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 634                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 635                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 636                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 637                 wclear(bot.win);
 638                 wclear(sb.win);
 639                 wclear(in.win);
 640                 scrollok(bot.win, 1);
 641                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 642                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 643                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 644                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 645                 nodelay(top.win, 1);
 646                 nodelay(bot.win, 1);
 647                 nodelay(sb.win, 1);
 648                 nodelay(in.win, 0);
 649
 650                 keypad(top.win, 1);
 651                 keypad(bot.win, 1);
 652                 keypad(sb.win, 1);
 653                 keypad(in.win, 1);
 654                 print_status_bar();
 655         }
 656         wmove(sep.win, 0, 0);
 657         for (i = 1; i <= COLS; i++)
 658                 waddstr(sep.win, theme.sep_str);
 659         wclear(top.win);
 660         //wclear(bot.win);
 661         wnoutrefresh(top.win);
 662         wnoutrefresh(bot.win);
 663         //wnoutrefresh(sb.win);
 664         print_status_bar();
 665         wnoutrefresh(in.win);
 666         wnoutrefresh(sep.win);
 667         doupdate();
 668 }
 669
 670 /*
 671  * Print stat item #i to curses window
 672  */
 673 static void print_stat_item(int i)
 674 {
 675         char *tmp;
 676         struct stat_item_data d = theme.data[i];
 677         char *c = stat_content[i];
 678
 679         if (!curses_active || !d.len || !c)
 680                 return;
 681         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 682         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 683         wrefresh(top.win);
 684         wattron(top.win, COLOR_PAIR(i + 1));
 685         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 686         free(tmp);
 687         wrefresh(top.win);
 688 }
 689
 690 static int update_item(int item_num, char *buf)
 691 {
 692         char **c = stat_content + item_num;
 693
 694         free(*c);
 695         if (buf && buf[0])
 696                 goto dup;
 697         switch (item_num) {
 698         case SI_ARTIST:
 699                 *c = para_strdup("(artist tag not set)");
 700                 goto print;
 701         case SI_TITLE:
 702                 *c = para_strdup("(title tag not set)");
 703                 goto print;
 704         case SI_YEAR:
 705                 *c = para_strdup("????");
 706                 goto print;
 707         case SI_ALBUM:
 708                 *c = para_strdup("(album tag not set)");
 709                 goto print;
 710         case SI_COMMENT:
 711                 *c = para_strdup("(comment tag not set)");
 712                 goto print;
 713         }
 714 dup:
 715         *c = para_strdup(buf);
 716 print:
 717         print_stat_item(item_num);
 718         return 1;
 719 }
 720
 721 static int read_stat_pipe(fd_set *rfds)
 722 {
 723         static char *buf;
 724         static int bufsize, loaded;
 725         int ret, ret2;
 726         size_t sz;
 727
 728         if (stat_pipe < 0)
 729                 return 0;
 730         if (loaded >= bufsize) {
 731                 if (bufsize > 1000 * 1000) {
 732                         loaded = 0;
 733                         return 0;
 734                 }
 735                 bufsize += bufsize + 1000;
 736                 buf = para_realloc(buf, bufsize);
 737         }
 738         assert(loaded < bufsize);
 739         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 740                 rfds, &sz);
 741         loaded += sz;
 742         ret2 = for_each_stat_item(buf, loaded, update_item);
 743         if (ret < 0 || ret2 < 0) {
 744                 loaded = 0;
 745                 return ret2 < 0? ret2 : ret;
 746         }
 747         sz = ret2; /* what is left */
 748         if (sz > 0 && sz < loaded)
 749                 memmove(buf, buf + loaded - sz, sz);
 750         loaded = sz;
 751         return 1;
 752 }
 753
 754 static void print_all_items(void)
 755 {
 756         int i;
 757
 758         if (!curses_active)
 759                 return;
 760         FOR_EACH_STATUS_ITEM(i)
 761                 print_stat_item(i);
 762 }
 763
 764 static void clear_all_items(void)
 765 {
 766         int i;
 767
 768         FOR_EACH_STATUS_ITEM(i) {
 769                 free(stat_content[i]);
 770                 stat_content[i] = para_strdup("");
 771         }
 772 }
 773
 774 static void init_pair_or_die(short pair, short f, short b)
 775 {
 776         if (init_pair(pair, f, b) == ERR)
 777                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 778 }
 779
 780 static void init_colors_or_die(void)
 781 {
 782         int i;
 783
 784         if (!has_colors())
 785                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 786         if (start_color() == ERR)
 787                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 788         FOR_EACH_STATUS_ITEM(i)
 789                 if (theme.data[i].len)
 790                         init_pair_or_die(i + 1, theme.data[i].fg,
 791                                 theme.data[i].bg);
 792         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 793         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 794         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 795         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 796         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 797         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 798         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 799         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 800         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 801 }
 802
 803 /* (Re-)initialize the curses library. */
 804 static void init_curses(void)
 805 {
 806         curses_active = 1;
 807         if (top.win && refresh() == ERR) /* refesh is really needed */
 808                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 809         if (LINES < theme.lines_min || COLS < theme.cols_min)
 810                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 811                         " (need at least %dx%d)\n", COLS, LINES,
 812                         theme.cols_min, theme.lines_min);
 813         curs_set(0); /* make cursor invisible, ignore errors */
 814         nonl(); /* do not NL->CR/NL on output, always returns OK */
 815         /* don't echo input */
 816         if (noecho() == ERR)
 817                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 818         /* take input chars one at a time, no wait for \n */
 819         if (cbreak() == ERR)
 820                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 821         init_colors_or_die();
 822         clear(); /* ignore non-fatal errors */
 823         init_wins(theme.top_lines_default);
 824         print_all_items();
 825         // noecho(); /* don't echo input */
 826 }
 827
 828 static void check_sigchld(void)
 829 {
 830         int ret;
 831         pid_t pid;
 832 reap_next_child:
 833         ret = para_reap_child(&pid);
 834         if (ret <= 0)
 835                 return;
 836         if (pid == cmd_pid) {
 837                 cmd_pid = 0;
 838                 cmd_died = 1;
 839         }
 840         goto reap_next_child;
 841 }
 842
 843 /*
 844  * This sucker modifies its first argument. *handler and *arg are
 845  * pointers to 0-terminated strings (inside line). Crap.
 846  */
 847 static int split_key_map(char *line, char **handler, char **arg)
 848 {
 849         if (!(*handler = strchr(line + 1, ':')))
 850                 goto err_out;
 851         **handler = '\0';
 852         (*handler)++;
 853         if (!(*arg = strchr(*handler, ':')))
 854                 goto err_out;
 855         **arg = '\0';
 856         (*arg)++;
 857         return 1;
 858 err_out:
 859         return 0;
 860 }
 861
 862 static int check_key_map_args(void)
 863 {
 864         char *s;
 865         int i, ret = -1;
 866         char *tmp = NULL, *handler, *arg;
 867
 868         for (i = 0; i < conf.key_map_given; ++i) {
 869                 s = conf.key_map_arg[i];
 870                 if (!(*s))
 871                         goto err_out;
 872                 free(tmp);
 873                 tmp = para_strdup(s);
 874                 if (!split_key_map(tmp, &handler, &arg))
 875                         goto err_out;
 876                 if (strlen(handler) != 1)
 877                         goto err_out;
 878                 if (*handler != 'x'
 879                         && *handler != 'd'
 880                         && *handler != 'i'
 881                         && *handler != 'p')
 882                         goto err_out;
 883                 if (*handler != 'i')
 884                         continue;
 885                 if (find_cmd_byname(arg) < 0)
 886                         goto err_out;
 887         }
 888         ret = 0;
 889 err_out:
 890         free(tmp);
 891         return ret;
 892 }
 893
 894 /*
 895  * React to various signal-related events
 896  */
 897 static void handle_signal(int sig)
 898 {
 899         switch (sig) {
 900         case SIGTERM:
 901                 msg_n_exit(EXIT_FAILURE,
 902                         "only the good die young (caught SIGTERM))\n");
 903                 return;
 904         case SIGWINCH:
 905                 if (curses_active) {
 906                         shutdown_curses();
 907                         init_curses();
 908                         redraw_bot_win();
 909                 }
 910                 return;
 911         case SIGINT:
 912                 PARA_WARNING_LOG("caught SIGINT, reset");
 913                 /* Nothing to do. SIGINT killed our child which gets noticed
 914                  * by do_select and resets everything.
 915                  */
 916                 return;
 917         case SIGUSR1:
 918                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 919                 com_reread_conf();
 920                 return;
 921         case SIGCHLD:
 922                 check_sigchld();
 923                 return;
 924         }
 925 }
 926
 927 static int open_stat_pipe(void)
 928 {
 929         static int init = 1;
 930         int ret, fds[3] = {0, 1, 0};
 931         pid_t pid;
 932
 933         if (init)
 934                 init = 0;
 935         else
 936                 /*
 937                  * Sleep a bit to avoid a busy loop. As the call to sleep() may
 938                  * be interrupted by SIGCHLD, we simply wait until the call
 939                  * succeeds.
 940                  */
 941                 while (sleep(2))
 942                         ; /* nothing */
 943         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 944         if (ret < 0)
 945                 return ret;
 946         ret = mark_fd_nonblocking(fds[1]);
 947         if (ret >= 0)
 948                 return fds[1];
 949         close(fds[1]);
 950         return ret;
 951 }
 952
 953 /*
 954  * This is the core select loop. Besides the (internal) signal
 955  * pipe, the following other fds are checked according to the mode:
 956  *
 957  * GETCH_MODE: check stdin, return when key is pressed
 958  *
 959  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 960  * of output has been read or when other end has closed command pipe or
 961  * when any key is pressed.
 962  *
 963  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 964  * is running. During that time curses is disabled.  Returns when
 965  * cmd_pid == 0.
 966  */
 967 static int do_select(int mode)
 968 {
 969         fd_set rfds;
 970         int ret;
 971         int max_fileno;
 972         char command_buf[4096] = "";
 973         int cbo = 0; /* command buf offset */
 974         struct timeval tv;
 975 repeat:
 976         tv.tv_sec = conf.timeout_arg  / 1000;
 977         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 978 //      ret = refresh_status();
 979         FD_ZERO(&rfds);
 980         max_fileno = 0;
 981         if (stat_pipe < 0)
 982                 stat_pipe = open_stat_pipe();
 983         if (stat_pipe >= 0)
 984                 para_fd_set(stat_pipe, &rfds, &max_fileno);
 985         /* signal pipe */
 986         para_fd_set(signal_pipe, &rfds, &max_fileno);
 987         /* command pipe only for COMMAND_MODE */
 988         if (command_pipe >= 0 && mode == COMMAND_MODE)
 989                 para_fd_set(command_pipe, &rfds, &max_fileno);
 990         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 991         if (ret <= 0)
 992                 goto check_return; /* skip fd checks */
 993         /* signals */
 994         ret = para_next_signal(&rfds);
 995         if (ret > 0)
 996                 handle_signal(ret);
 997         /* read command pipe if ready */
 998         if (command_pipe >= 0 && mode == COMMAND_MODE) {
 999                 size_t sz;
1000                 ret = read_nonblock(command_pipe, command_buf + cbo,
1001                         sizeof(command_buf) - 1 - cbo, &rfds, &sz);
1002                 cbo += sz;
1003                 sz = cbo;
1004                 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
1005                 if (sz != cbo)
1006                         wrefresh(bot.win);
1007                 if (ret < 0) {
1008                         PARA_NOTICE_LOG("closing command pipe: %s",
1009                                 para_strerror(-ret));
1010                         close(command_pipe);
1011                         command_pipe = -1;
1012                         return 0;
1013                 }
1014         }
1015         ret = read_stat_pipe(&rfds);
1016         if (ret < 0) {
1017                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1018                 close(stat_pipe);
1019                 stat_pipe = -1;
1020                 clear_all_items();
1021                 free(stat_content[SI_BASENAME]);
1022                 stat_content[SI_BASENAME] =
1023                         para_strdup("stat command terminated!?");
1024                 print_all_items();
1025         }
1026 check_return:
1027         switch (mode) {
1028         case COMMAND_MODE:
1029                 ret = wgetch(top.win);
1030                 if (ret != ERR && ret != KEY_RESIZE) {
1031                         if (command_pipe) {
1032                                 close(command_pipe);
1033                                 command_pipe = -1;
1034                         }
1035                         if (cmd_pid)
1036                                 kill(cmd_pid, SIGTERM);
1037                         return -1;
1038                 }
1039                 break;
1040         case GETCH_MODE:
1041                 ret = wgetch(top.win);
1042                 if (ret != ERR && ret != KEY_RESIZE)
1043                         return ret;
1044                 break;
1045         case EXTERNAL_MODE:
1046                 if (cmd_died) {
1047                         cmd_died = 0;
1048                         return 0;
1049                 }
1050         }
1051         goto repeat;
1052 }
1053
1054 /*
1055  * read from command pipe and print data to bot window
1056  */
1057 static void send_output(void)
1058 {
1059         int ret;
1060
1061         if (command_pipe < 0)
1062                 return;
1063         ret = mark_fd_nonblocking(command_pipe);
1064         if (ret < 0) {
1065                 close(command_pipe);
1066                 return;
1067         }
1068         if (do_select(COMMAND_MODE) >= 0)
1069                 PARA_INFO_LOG("command complete");
1070         else
1071                 PARA_NOTICE_LOG("command aborted");
1072         print_in_bar(COLOR_MSG, " ");
1073 }
1074
1075 static void client_cmd_cmdline(char *cmd)
1076 {
1077         int ret, fds[3] = {0, 1, 0};
1078         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1079
1080         outputf(COLOR_COMMAND, "%s", c);
1081         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1082         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1083         free(c);
1084         if (ret < 0)
1085                 return;
1086         command_pipe = fds[1];
1087         send_output();
1088 }
1089
1090 /*
1091  * exec command and print output to bot win
1092  */
1093 static void display_cmd(char *cmd)
1094 {
1095         int fds[3] = {0, 1, 0};
1096
1097         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1098         outputf(COLOR_COMMAND, "%s", cmd);
1099         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1100                 return;
1101         command_pipe = fds[1];
1102         send_output();
1103 }
1104
1105 /*
1106  * shutdown curses and stat pipe before executing external commands
1107  */
1108 static void external_cmd(char *cmd)
1109 {
1110         int fds[3] = {-1, -1, -1};
1111
1112         if (cmd_pid)
1113                 return;
1114         shutdown_curses();
1115         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1116         cmd_died = 0;
1117         do_select(EXTERNAL_MODE);
1118         init_curses();
1119 }
1120
1121 static void print_scroll_msg(void)
1122 {
1123         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1124         int first_rbe = first_visible_rbe(&lines_total);
1125         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1126                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1127 }
1128
1129 static void com_scroll_top(void)
1130 {
1131         int i = RINGBUFFER_SIZE - 1;
1132         unsigned lines = 0;
1133
1134         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1135                 i--;
1136         /* i is oldest entry */
1137         for (; lines < bot.lines && i >= 0; i--) {
1138                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1139                 if (!rbe)
1140                         break;
1141                 lines += NUM_LINES(strlen(rbe->msg));
1142         }
1143         i++;
1144         if (lines > 0 && scroll_position != i) {
1145                 scroll_position = i;
1146                 redraw_bot_win();
1147                 print_scroll_msg();
1148                 return;
1149         }
1150         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1151 }
1152
1153 static void com_cancel_scrolling(void)
1154 {
1155
1156         if (scroll_position == 0) {
1157                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1158                 return;
1159         }
1160         scroll_position = 0;
1161         redraw_bot_win();
1162 }
1163
1164 static void com_page_down(void)
1165 {
1166         unsigned lines = 0;
1167         int i = scroll_position;
1168         while (lines < bot.lines && --i > 0) {
1169                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1170                 if (!rbe)
1171                         break;
1172                 lines += NUM_LINES(strlen(rbe->msg));
1173         }
1174         if (lines) {
1175                 scroll_position = i;
1176                 redraw_bot_win();
1177                 print_scroll_msg();
1178                 return;
1179         }
1180         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1181 }
1182
1183 static void com_page_up(void)
1184 {
1185         unsigned lines;
1186         int fvr = first_visible_rbe(&lines);
1187
1188         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1189                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1190                 return;
1191         }
1192         scroll_position = fvr + 1;
1193         for (; scroll_position > 0; scroll_position--) {
1194                 first_visible_rbe(&lines);
1195                 if (lines == bot.lines)
1196                         break;
1197         }
1198         redraw_bot_win();
1199         print_scroll_msg();
1200 }
1201
1202 static void com_scroll_down(void)
1203 {
1204         struct rb_entry *rbe;
1205         int rbe_lines;
1206
1207         if (!scroll_position) {
1208                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1209                 return;
1210         }
1211         scroll_position--;
1212         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1213         rbe_lines = NUM_LINES(rbe->len);
1214         wscrl(bot.win, rbe_lines);
1215         wmove(bot.win, bot.lines - rbe_lines, 0);
1216         wattron(bot.win, COLOR_PAIR(rbe->color));
1217         waddstr(bot.win, rbe->msg);
1218         wrefresh(bot.win);
1219         print_scroll_msg();
1220 }
1221
1222 static void com_scroll_up(void)
1223 {
1224         struct rb_entry *rbe = NULL;
1225         unsigned lines;
1226         int i, first_rbe, num_scroll;
1227
1228         /* the entry that is going to vanish */
1229         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1230         if (!rbe)
1231                 goto err_out;
1232         num_scroll = NUM_LINES(rbe->len);
1233         first_rbe = first_visible_rbe(&lines);
1234         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1235                 goto err_out;
1236         scroll_position++;
1237         wscrl(bot.win, -num_scroll);
1238         i = draw_top_rbe(&lines);
1239         if (i < 0)
1240                 goto err_out;
1241         while (i > 0 && lines < num_scroll) {
1242                 int rbe_lines;
1243                 rbe = ringbuffer_get(bot_win_rb, --i);
1244                 if (!rbe)
1245                         break;
1246                 rbe_lines = NUM_LINES(rbe->len);
1247                 lines += rbe_lines;
1248 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1249                 wattron(bot.win, COLOR_PAIR(rbe->color));
1250                 waddstr(bot.win, "\n");
1251                 waddstr(bot.win, rbe->msg);
1252                 if (!i)
1253                         break;
1254                 i--;
1255         }
1256         wrefresh(bot.win);
1257         print_scroll_msg();
1258         return;
1259 err_out:
1260         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1261 }
1262
1263 static void com_ll_decr(void)
1264 {
1265         if (loglevel <= LL_DEBUG) {
1266                 print_in_bar(COLOR_ERRMSG,
1267                         "loglevel already at maximal verbosity\n");
1268                 return;
1269         }
1270         loglevel--;
1271         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1272 }
1273
1274 static void com_ll_incr(void)
1275 {
1276         if (loglevel >= LL_EMERG) {
1277                 print_in_bar(COLOR_ERRMSG,
1278                         "loglevel already at minimal verbosity\n");
1279                 return;
1280         }
1281         loglevel++;
1282         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1283 }
1284
1285 /*
1286  * reread configuration, terminate on errors
1287  */
1288 static void com_reread_conf(void)
1289 {
1290         char *cf =configfile_exists();
1291         struct gui_cmdline_parser_params params = {
1292                 .override = 1,
1293                 .initialize = 1,
1294                 .check_required = 0,
1295                 .check_ambiguity = 0,
1296                 .print_errors = 0,
1297         };
1298
1299         if (!cf) {
1300                 PARA_WARNING_LOG("there is no configuration to read");
1301                 return;
1302         }
1303         PARA_INFO_LOG("rereading command line options and config file");
1304         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1305         if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1306                 PARA_EMERG_LOG("errors in config file");
1307                 finish(EXIT_FAILURE);
1308         }
1309         PARA_NOTICE_LOG("config file reloaded");
1310         if (check_key_map_args() < 0)
1311                 finish(EXIT_FAILURE);
1312 }
1313
1314 static void com_help(void)
1315 {
1316         int i;
1317
1318         for (i = 0; i < conf.key_map_given; ++i) {
1319                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1320                 const char *handler_text = "???", *desc = NULL;
1321
1322                 if (!split_key_map(tmp, &handler, &arg)) {
1323                         free(tmp);
1324                         return;
1325                 }
1326                 switch (*handler) {
1327                         case 'i':
1328                                 handler_text = "internal";
1329                                 desc = command_list[find_cmd_byname(arg)].description;
1330                                 break;
1331                         case 'x': handler_text = "external"; break;
1332                         case 'd': handler_text = "display "; break;
1333                         case 'p': handler_text = "para    "; break;
1334                 }
1335                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1336                         strlen(arg) < 8? "\t" : "",
1337                         desc? desc : "");
1338                 free(tmp);
1339         }
1340         for (i = 0; command_list[i].handler; i++) {
1341                 struct gui_command gc = command_list[i];
1342
1343                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1344                         strlen(gc.name) < 8? "\t" : "",
1345                         gc.description);
1346         }
1347         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1348                 "for more info");
1349 }
1350
1351 static void com_shrink_top_win(void)
1352 {
1353         if (top.lines <= theme.top_lines_min) {
1354                 PARA_WARNING_LOG("can not decrease top window");
1355                 return;
1356         }
1357         init_wins(top.lines - 1);
1358         wclear(top.win);
1359         print_all_items();
1360         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1361 }
1362
1363 static void com_enlarge_top_win(void)
1364 {
1365         if (bot.lines < 3) {
1366                 PARA_WARNING_LOG("can not increase top window");
1367                 return;
1368         }
1369         init_wins(top.lines + 1);
1370         wclear(top.win);
1371         print_all_items();
1372         print_in_bar(COLOR_MSG, "increased top window");
1373 }
1374
1375 static void com_version(void)
1376 {
1377         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1378                 CODENAME "\"");
1379 }
1380
1381 __noreturn static void com_quit(void)
1382 {
1383         finish(0);
1384 }
1385
1386 static void com_refresh(void)
1387 {
1388         shutdown_curses();
1389         init_curses();
1390 }
1391
1392 static void change_theme(int next)
1393 {
1394         if (next)
1395                 next_theme(&theme);
1396         else
1397                 prev_theme(&theme);
1398         /* This seems to be needed twice, why? */
1399         com_refresh();
1400         com_refresh();
1401         PARA_NOTICE_LOG("new theme: %s", theme.name);
1402 }
1403
1404 static void com_next_theme(void)
1405 {
1406         change_theme(1);
1407 }
1408
1409 static void com_prev_theme(void)
1410 {
1411         change_theme(0);
1412 }
1413
1414
1415 static void handle_command(int c)
1416 {
1417         int i;
1418
1419         /* first check user's key bindings */
1420         for (i = 0; i < conf.key_map_given; ++i) {
1421                 char *tmp, *handler, *arg;
1422
1423                 tmp = para_strdup(conf.key_map_arg[i]);
1424                 if (!split_key_map(tmp, &handler, &arg)) {
1425                         free(tmp);
1426                         return;
1427                 }
1428                 if (strcmp(tmp, km_keyname(c))) {
1429                         free(tmp);
1430                         continue;
1431                 }
1432                 if (*handler == 'd')
1433                         display_cmd(arg);
1434                 else if (*handler == 'x')
1435                         external_cmd(arg);
1436                 else if (*handler == 'p')
1437                         client_cmd_cmdline(arg);
1438                 else if (*handler == 'i') {
1439                         int num = find_cmd_byname(arg);
1440                         if (num >= 0)
1441                                 command_list[num].handler();
1442                 }
1443                 free(tmp);
1444                 return;
1445         }
1446         /* not found, check internal key bindings */
1447         for (i = 0; command_list[i].handler; i++) {
1448                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1449                         command_list[i].handler();
1450                         return;
1451                 }
1452         }
1453         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1454                 km_keyname(c));
1455 }
1456
1457 int main(int argc, char *argv[])
1458 {
1459         int ret;
1460         char *cf;
1461
1462         _argc = argc;
1463         _argv = argv;
1464
1465         if (gui_cmdline_parser(argc, argv, &conf) != 0)
1466                 exit(EXIT_FAILURE);
1467         HANDLE_VERSION_FLAG("gui", conf);
1468         cf = configfile_exists();
1469         if (!cf && conf.config_file_given) {
1470                 fprintf(stderr, "can not read config file %s\n",
1471                         conf.config_file_arg);
1472                 exit(EXIT_FAILURE);
1473         }
1474         if (cf) {
1475                 struct gui_cmdline_parser_params params = {
1476                         .override = 0,
1477                         .initialize = 0,
1478                         .check_required = 0,
1479                         .check_ambiguity = 0,
1480                         .print_errors = 1,
1481                 };
1482                 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1483                         exit(EXIT_FAILURE);
1484         }
1485         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1486         if (check_key_map_args() < 0) {
1487                 fprintf(stderr, "invalid key map\n");
1488                 exit(EXIT_FAILURE);
1489         }
1490         init_theme_or_die(conf.theme_arg, &theme);
1491         top.lines = theme.top_lines_default;
1492         setup_signal_handling();
1493         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1494         initscr(); /* needed only once, always successful */
1495         init_curses();
1496         print_welcome();
1497         for (;;) {
1498                 print_status_bar();
1499                 ret = do_select(GETCH_MODE);
1500                 if (!ret)
1501                         continue;
1502                 print_in_bar(COLOR_MSG, " ");
1503                 handle_command(ret);
1504         }
1505 }