gui.c

   1 /*
   2  * Copyright (C) 1998-2014 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c Curses-based interface for paraslash. */
   8
   9 #include <regex.h>
  10 #include <signal.h>
  11 #include <sys/types.h>
  12 #include <curses.h>
  13 #include <locale.h>
  14 #include <sys/time.h>
  15
  16 #include "gui.cmdline.h"
  17 #include "para.h"
  18 #include "gui.h"
  19 #include "string.h"
  20 #include "ringbuffer.h"
  21 #include "fd.h"
  22 #include "error.h"
  23 #include "list.h"
  24 #include "sched.h"
  25 #include "signal.h"
  26 #include "ggo.h"
  27 #include "version.h"
  28
  29 /** define the array of error lists needed by para_gui */
  30 INIT_GUI_ERRLISTS;
  31 static char *stat_content[NUM_STAT_ITEMS];
  32
  33 static int signal_pipe;
  34
  35 static struct gui_window {
  36         WINDOW *win;
  37         size_t begx;
  38         size_t begy;
  39         size_t cols;
  40         size_t lines;
  41 } top, bot, sb, in, sep;
  42
  43 #define RINGBUFFER_SIZE 512
  44 struct rb_entry {
  45         char *msg;
  46         size_t len;
  47         int color;
  48 };
  49 static struct ringbuffer *bot_win_rb;
  50 #define NUM_LINES(len) (1 + (len) / bot.cols)
  51
  52 static unsigned scroll_position;
  53
  54 static bool curses_active;
  55 static pid_t cmd_pid;
  56
  57 static int command_fds[2] = {-1, -1};
  58 static int stat_pipe = -1;
  59 static struct gui_args_info conf;
  60
  61 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  62
  63
  64 /**
  65  * Codes for various colors.
  66  *
  67  * Each status item has its own color pair. The ones defined here start at a
  68  * higher number so that they do not overlap with these.
  69  */
  70 enum gui_color_pair {
  71         COLOR_STATUSBAR = NUM_STAT_ITEMS + 1,
  72         COLOR_COMMAND,
  73         COLOR_OUTPUT,
  74         COLOR_MSG,
  75         COLOR_ERRMSG,
  76         COLOR_WELCOME,
  77         COLOR_SEPARATOR,
  78         COLOR_TOP,
  79         COLOR_BOT,
  80 };
  81
  82 struct gui_command {
  83         const char *key;
  84         const char *name;
  85         const char *description;
  86         void (*handler)(void);
  87 };
  88
  89 static struct gui_theme theme;
  90
  91 static int _argc;
  92 static char **_argv;
  93
  94 static void com_help(void);
  95 static void com_reread_conf(void);
  96 static void com_enlarge_top_win(void);
  97 static void com_shrink_top_win(void);
  98 static void com_version(void);
  99 __noreturn static void com_quit(void);
 100 static void com_refresh(void);
 101 static void com_ll_incr(void);
 102 static void com_ll_decr(void);
 103 static void com_prev_theme(void);
 104 static void com_next_theme(void);
 105 static void com_scroll_up(void);
 106 static void com_scroll_down(void);
 107 static void com_page_up(void);
 108 static void com_page_down(void);
 109 static void com_cancel_scrolling(void);
 110 static void com_scroll_top(void);
 111
 112 static struct gui_command command_list[] = {
 113         {
 114                 .key = "?",
 115                 .name = "help",
 116                 .description = "print help",
 117                 .handler = com_help
 118         }, {
 119                 .key = "+",
 120                 .name = "enlarge_win",
 121                 .description = "enlarge the top window",
 122                 .handler = com_enlarge_top_win
 123         }, {
 124                 .key = "-",
 125                 .name = "shrink_win",
 126                 .description = "shrink the top window",
 127                 .handler = com_shrink_top_win
 128         }, {
 129                 .key = "r",
 130                 .name = "reread_conf",
 131                 .description = "reread configuration file",
 132                 .handler = com_reread_conf
 133         }, {
 134                 .key = "q",
 135                 .name = "quit",
 136                 .description = "exit para_gui",
 137                 .handler = com_quit
 138         }, {
 139                 .key = "^L",
 140                 .name = "refresh",
 141                 .description = "redraw the screen",
 142                 .handler = com_refresh
 143         }, {
 144                 .key = ".",
 145                 .name = "next_theme",
 146                 .description = "switch to next theme",
 147                 .handler = com_next_theme
 148         }, {
 149                 .key = ",",
 150                 .name = "prev_theme",
 151                 .description = "switch to previous stream",
 152                 .handler = com_prev_theme
 153         }, {
 154                 .key = ">",
 155                 .name = "ll_incr",
 156                 .description = "increase loglevel (decreases verbosity)",
 157                 .handler = com_ll_incr
 158         }, {
 159                 .key = "<",
 160                 .name = "ll_decr",
 161                 .description = "decrease loglevel (increases verbosity)",
 162                 .handler = com_ll_decr
 163         }, {
 164                 .key = "V",
 165                 .name = "version",
 166                 .description = "show the para_gui version",
 167                 .handler = com_version
 168         }, {
 169                 .key = "<up>",
 170                 .name = "scroll_up",
 171                 .description = "scroll up one line",
 172                 .handler = com_scroll_up
 173         }, {
 174                 .key = "<down>",
 175                 .name = "scroll_down",
 176                 .description = "scroll down one line",
 177                 .handler = com_scroll_down
 178         }, {
 179                 .key = "<ppage>",
 180                 .name = "page_up",
 181                 .description = "scroll up one page",
 182                 .handler = com_page_up
 183         }, {
 184                 .key = "<npage>",
 185                 .name = "page_down",
 186                 .description = "scroll down one page",
 187                 .handler = com_page_down
 188         }, {
 189                 .key = "<home>",
 190                 .name = "scroll_top",
 191                 .description = "scroll to top of buffer",
 192                 .handler = com_scroll_top
 193         }, {
 194                 .key = "<end>",
 195                 .name = "cancel_scroll",
 196                 .description = "deactivate scroll mode",
 197                 .handler = com_cancel_scrolling
 198         }, {
 199                 .handler = NULL
 200         }
 201 };
 202
 203 static int find_cmd_byname(char *name)
 204 {
 205         int i;
 206
 207         for (i = 0; command_list[i].handler; i++)
 208                 if (!strcmp(command_list[i].name, name))
 209                         return i;
 210         return -1;
 211 }
 212
 213 /* taken from mutt */
 214 static char *km_keyname(int c)
 215 {
 216         static char buf[10];
 217
 218         if (c == KEY_UP) {
 219                 sprintf(buf, "<up>");
 220                 return buf;
 221         }
 222         if (c == KEY_DOWN) {
 223                 sprintf(buf, "<down>");
 224                 return buf;
 225         }
 226         if (c == KEY_LEFT) {
 227                 sprintf(buf, "<left>");
 228                 return buf;
 229         }
 230         if (c == KEY_RIGHT) {
 231                 sprintf(buf, "<right>");
 232                 return buf;
 233         }
 234         if (c == KEY_NPAGE) {
 235                 sprintf(buf, "<npage>");
 236                 return buf;
 237         }
 238         if (c == KEY_PPAGE) {
 239                 sprintf(buf, "<ppage>");
 240                 return buf;
 241         }
 242         if (c == KEY_HOME) {
 243                 sprintf(buf, "<home>");
 244                 return buf;
 245         }
 246         if (c == KEY_END) {
 247                 sprintf(buf, "<end>");
 248                 return buf;
 249         }
 250         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 251                 if (c < 0)
 252                         c += 256;
 253                 if (c < 128) {
 254                         buf[0] = '^';
 255                         buf[1] = (c + '@') & 0x7f;
 256                         buf[2] = 0;
 257                 } else
 258                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 259                                 (c >> 3) & 7, c & 7);
 260         } else if (c >= KEY_F0 && c < KEY_F(256))
 261                 sprintf(buf, "<F%d>", c - KEY_F0);
 262         else if (isprint(c))
 263                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 264         else
 265                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 266         return buf;
 267 }
 268
 269 static char *configfile_exists(void)
 270 {
 271         static char *config_file;
 272         char *tmp;
 273
 274         if (!conf.config_file_given) {
 275                 if (!config_file) {
 276                         char *home = para_homedir();
 277                         config_file = make_message("%s/.paraslash/gui.conf",
 278                                 home);
 279                         free(home);
 280                 }
 281                 tmp = config_file;
 282         } else
 283                 tmp = conf.config_file_arg;
 284         return file_exists(tmp)? tmp: NULL;
 285 }
 286
 287 /* Print given number of spaces to curses window. */
 288 static void add_spaces(WINDOW* win, unsigned int num)
 289 {
 290         char space[] = "                                ";
 291         unsigned sz = sizeof(space) - 1; /* number of spaces */
 292
 293         while (num >= sz)  {
 294                 waddstr(win, space);
 295                 num -= sz;
 296         }
 297         if (num > 0) {
 298                 assert(num < sz);
 299                 space[num] = '\0';
 300                 waddstr(win, space);
 301         }
 302 }
 303
 304 /*
 305  * print aligned string to curses window. This function always prints
 306  * exactly len chars.
 307  */
 308 static int align_str(WINDOW* win, char *str, unsigned int len,
 309                 unsigned int align)
 310 {
 311         int ret, i, num; /* of spaces */
 312         size_t width;
 313
 314         if (!win || !str)
 315                 return 0;
 316         ret = strwidth(str, &width);
 317         if (ret < 0) {
 318                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 319                 width = 0;
 320                 str[0] = '\0';
 321         }
 322         num = len - width;
 323         if (num < 0) {
 324                 str[len] = '\0';
 325                 num = 0;
 326         }
 327         /* replace control characters by spaces */
 328         for (i = 0; i < len && str[i]; i++) {
 329                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 330                         str[i] = ' ';
 331         }
 332         if (align == LEFT) {
 333                 waddstr(win, str);
 334                 add_spaces(win, num);
 335         } else if (align == RIGHT) {
 336                 add_spaces(win, num);
 337                 waddstr(win, str);
 338         } else {
 339                 add_spaces(win, num / 2);
 340                 waddstr(win, str[0]? str: "");
 341                 add_spaces(win, num - num / 2);
 342         }
 343         return 1;
 344 }
 345
 346 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 347 {
 348         char *msg;
 349         va_list ap;
 350
 351         if (!curses_active)
 352                 return;
 353         wattron(in.win, COLOR_PAIR(color));
 354         va_start(ap, fmt);
 355         xvasprintf(&msg, fmt, ap);
 356         va_end(ap);
 357         wmove(in.win, 0, 0);
 358         align_str(in.win, msg, in.cols, LEFT);
 359         free(msg);
 360         wrefresh(in.win);
 361 }
 362
 363 /*
 364  * update the status bar
 365  */
 366 static void print_status_bar(void)
 367 {
 368         char *tmp;
 369
 370         if (!curses_active)
 371                 return;
 372         tmp = para_strdup("para_gui " PACKAGE_VERSION " (hit ? for help)");
 373         wmove(sb.win, 0, 0);
 374         align_str(sb.win, tmp, sb.cols, CENTER);
 375         free(tmp);
 376         wrefresh(sb.win);
 377 }
 378
 379 /*
 380  * get the number of the oldest rbe that is (partially) visible. On return,
 381  * lines contains the sum of the number of lines of all visible entries. If the
 382  * first one is only partially visible, lines is greater than bot.lines.
 383  */
 384 static int first_visible_rbe(unsigned *lines)
 385 {
 386         int i;
 387         *lines = 0;
 388         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 389                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 390                 int rbe_lines;
 391                 if (!rbe)
 392                         return i - 1;
 393 //              fprintf(stderr, "found: %s\n", rbe->msg);
 394                 rbe_lines = NUM_LINES(rbe->len);
 395                 if (rbe_lines > bot.lines)
 396                         return -1;
 397                 *lines += rbe_lines;
 398                 if (*lines >= bot.lines)
 399                         return i;
 400         }
 401         return RINGBUFFER_SIZE - 1;
 402 }
 403
 404 /*
 405 returns number of first visible rbe, *lines is the number of lines drawn.
 406  */
 407 static int draw_top_rbe(unsigned *lines)
 408 {
 409         int ret, fvr = first_visible_rbe(lines);
 410         struct rb_entry *rbe;
 411         size_t bytes_to_skip, cells_to_skip, width;
 412
 413         if (fvr < 0)
 414                 return -1;
 415         wmove(bot.win, 0, 0);
 416         rbe = ringbuffer_get(bot_win_rb, fvr);
 417         if (!rbe)
 418                 return -1;
 419         if (*lines > bot.lines) {
 420                 /* rbe is partially visible multi-line */
 421                 cells_to_skip = (*lines - bot.lines) * bot.cols;
 422                 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
 423                 if (ret < 0)
 424                         return ret;
 425                 ret = strwidth(rbe->msg + bytes_to_skip, &width);
 426                 if (ret < 0)
 427                         return ret;
 428         } else {
 429                 bytes_to_skip = 0;
 430                 width = rbe->len;
 431         }
 432         wattron(bot.win, COLOR_PAIR(rbe->color));
 433         waddstr(bot.win, rbe->msg + bytes_to_skip);
 434         *lines = NUM_LINES(width);
 435         return fvr;
 436 }
 437
 438 static void redraw_bot_win(void)
 439 {
 440         unsigned lines;
 441         int i;
 442
 443         wmove(bot.win, 0, 0);
 444         wclear(bot.win);
 445         i = draw_top_rbe(&lines);
 446         if (i <= 0)
 447                 goto out;
 448         while (i > 0 && lines < bot.lines) {
 449                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 450                 if (!rbe) {
 451                         lines++;
 452                         waddstr(bot.win, "\n");
 453                         continue;
 454                 }
 455                 lines += NUM_LINES(rbe->len);
 456                 wattron(bot.win, COLOR_PAIR(rbe->color));
 457                 waddstr(bot.win, "\n");
 458                 waddstr(bot.win, rbe->msg);
 459         }
 460 out:
 461         wrefresh(bot.win);
 462 }
 463
 464 static void rb_add_entry(int color, char *msg)
 465 {
 466         struct rb_entry *old, *new;
 467         int x, y;
 468         size_t len;
 469
 470         if (strwidth(msg, &len) < 0)
 471                 return;
 472         new = para_malloc(sizeof(struct rb_entry));
 473         new->color = color;
 474         new->len = len;
 475         new->msg = msg;
 476         old = ringbuffer_add(bot_win_rb, new);
 477 //      fprintf(stderr, "added: %s\n", new->msg);
 478         if (old) {
 479                 free(old->msg);
 480                 free(old);
 481         }
 482         if (scroll_position) {
 483                 /* discard current scrolling, like xterm does */
 484                 scroll_position = 0;
 485                 redraw_bot_win();
 486                 return;
 487         }
 488         wattron(bot.win, COLOR_PAIR(color));
 489         getyx(bot.win, y, x);
 490         if (y || x)
 491                 waddstr(bot.win, "\n");
 492         waddstr(bot.win, msg);
 493 }
 494
 495 /*
 496  * print formated output to bot win and refresh
 497  */
 498 __printf_2_3 static void outputf(int color, const char* fmt,...)
 499 {
 500         char *msg;
 501         va_list ap;
 502
 503         if (!curses_active)
 504                 return;
 505         va_start(ap, fmt);
 506         xvasprintf(&msg, fmt, ap);
 507         va_end(ap);
 508         rb_add_entry(color, msg);
 509         wrefresh(bot.win);
 510 }
 511
 512 static int add_output_line(char *line, void *data)
 513 {
 514         int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 515
 516         if (!curses_active)
 517                 return 1;
 518         rb_add_entry(color, para_strdup(line));
 519         return 1;
 520 }
 521
 522 static int loglevel;
 523
 524 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 525 {
 526         int color;
 527         char *msg;
 528         va_list ap;
 529
 530         if (ll < loglevel || !curses_active)
 531                 return;
 532         switch (ll) {
 533                 case LL_DEBUG:
 534                 case LL_INFO:
 535                 case LL_NOTICE:
 536                         color = COLOR_MSG;
 537                         break;
 538                 default:
 539                         color = COLOR_ERRMSG;
 540         }
 541         va_start(ap, fmt);
 542         xvasprintf(&msg, fmt, ap);
 543         va_end(ap);
 544         chop(msg);
 545         rb_add_entry(color, msg);
 546         wrefresh(bot.win);
 547 }
 548 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 549
 550 static void setup_signal_handling(void)
 551 {
 552         signal_pipe = para_signal_init();
 553         para_install_sighandler(SIGINT);
 554         para_install_sighandler(SIGTERM);
 555         para_install_sighandler(SIGCHLD);
 556         para_install_sighandler(SIGWINCH);
 557         para_install_sighandler(SIGUSR1);
 558 }
 559
 560 /* kill every process in the process group and exit */
 561 __noreturn static void kill_pg_and_die(int ret)
 562 {
 563         para_sigaction(SIGTERM, SIG_IGN);
 564         kill(0, SIGTERM);
 565         exit(ret);
 566 }
 567
 568 static void shutdown_curses(void)
 569 {
 570         if (!curses_active)
 571                 return;
 572         def_prog_mode();
 573         curses_active = false;
 574         endwin();
 575 }
 576
 577 __noreturn static void finish(int ret)
 578 {
 579         shutdown_curses();
 580         kill_pg_and_die(ret);
 581 }
 582
 583 /*
 584  * exit curses and print given message to stdout/stderr
 585  */
 586 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 587 {
 588         va_list argp;
 589         FILE *outfd = ret? stderr: stdout;
 590
 591         shutdown_curses();
 592         va_start(argp, fmt);
 593         vfprintf(outfd, fmt, argp);
 594         va_end(argp);
 595         kill_pg_and_die(ret);
 596 }
 597
 598 static void print_welcome(void)
 599 {
 600         if (loglevel > LL_NOTICE)
 601                 return;
 602         outputf(COLOR_WELCOME, "Welcome to %s. Theme: %s",
 603                 version_single_line("gui"), theme.name);
 604         wclrtoeol(bot.win);
 605 }
 606
 607 /*
 608  * init all windows
 609  */
 610 static void init_wins(int top_lines)
 611 {
 612         int i;
 613
 614         top.lines = top_lines;
 615         top.cols = COLS;
 616         top.begy = 0;
 617         top.begx = 0;
 618
 619         bot.lines = LINES - top.lines - 3;
 620         bot.cols = COLS;
 621         bot.begy = top.lines + 1;
 622         bot.begx = 0;
 623
 624         sb.lines = 1;
 625         sb.cols = COLS;
 626         sb.begy = LINES - 2;
 627         sb.begx = 0;
 628
 629         in.lines = 1;
 630         in.cols = COLS;
 631         in.begy = LINES - 1;
 632         in.begx = 0;
 633
 634         sep.lines = 1;
 635         sep.cols = COLS;
 636         sep.begy = top.lines;
 637         sep.begx = 0;
 638
 639         assume_default_colors(theme.default_fg, theme.default_bg);
 640         if (top.win) {
 641                 mvwin(top.win, top.begy, top.begx);
 642                 wresize(top.win, top.lines, top.cols);
 643
 644                 mvwin(sb.win, sb.begy, sb.begx);
 645                 wresize(sb.win, sb.lines, sb.cols);
 646
 647                 mvwin(sep.win, sep.begy, sep.begx);
 648                 wresize(sep.win, sep.lines, sep.cols);
 649
 650                 mvwin(bot.win, bot.begy, bot.begx);
 651                 wresize(bot.win, bot.lines, bot.cols);
 652
 653                 mvwin(in.win, in.begy, in.begx);
 654                 wresize(in.win, in.lines, in.cols);
 655         } else {
 656                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 657                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 658                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 659                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 660                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 661                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 662                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 663                 wclear(bot.win);
 664                 wclear(sb.win);
 665                 wclear(in.win);
 666                 scrollok(bot.win, 1);
 667                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 668                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 669                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 670                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 671                 nodelay(top.win, 1);
 672                 nodelay(bot.win, 1);
 673                 nodelay(sb.win, 1);
 674                 nodelay(in.win, 0);
 675
 676                 keypad(top.win, 1);
 677                 keypad(bot.win, 1);
 678                 keypad(sb.win, 1);
 679                 keypad(in.win, 1);
 680         }
 681         wmove(sep.win, 0, 0);
 682         for (i = 1; i <= COLS; i++)
 683                 waddstr(sep.win, theme.sep_str);
 684         wclear(top.win);
 685         //wclear(bot.win);
 686         wnoutrefresh(top.win);
 687         wnoutrefresh(bot.win);
 688         //wnoutrefresh(sb.win);
 689         print_status_bar();
 690         wnoutrefresh(in.win);
 691         wnoutrefresh(sep.win);
 692         doupdate();
 693 }
 694
 695 /*
 696  * Print stat item #i to curses window
 697  */
 698 static void print_stat_item(int i)
 699 {
 700         char *tmp;
 701         struct stat_item_data d = theme.data[i];
 702         char *c = stat_content[i];
 703
 704         if (!curses_active || !d.len || !c)
 705                 return;
 706         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 707         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 708         wrefresh(top.win);
 709         wattron(top.win, COLOR_PAIR(i + 1));
 710         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 711         free(tmp);
 712         wrefresh(top.win);
 713 }
 714
 715 static int update_item(int item_num, char *buf)
 716 {
 717         char **c = stat_content + item_num;
 718
 719         free(*c);
 720         if (buf && buf[0])
 721                 goto dup;
 722         switch (item_num) {
 723         case SI_ARTIST:
 724                 *c = para_strdup("(artist tag not set)");
 725                 goto print;
 726         case SI_TITLE:
 727                 *c = para_strdup("(title tag not set)");
 728                 goto print;
 729         case SI_YEAR:
 730                 *c = para_strdup("????");
 731                 goto print;
 732         case SI_ALBUM:
 733                 *c = para_strdup("(album tag not set)");
 734                 goto print;
 735         case SI_COMMENT:
 736                 *c = para_strdup("(comment tag not set)");
 737                 goto print;
 738         }
 739 dup:
 740         *c = para_strdup(buf);
 741 print:
 742         print_stat_item(item_num);
 743         return 1;
 744 }
 745
 746 static int read_stat_pipe(fd_set *rfds)
 747 {
 748         static char *buf;
 749         static int bufsize, loaded;
 750         int ret, ret2;
 751         size_t sz;
 752
 753         if (stat_pipe < 0)
 754                 return 0;
 755         if (loaded >= bufsize) {
 756                 if (bufsize > 1000 * 1000) {
 757                         loaded = 0;
 758                         return 0;
 759                 }
 760                 bufsize += bufsize + 1000;
 761                 buf = para_realloc(buf, bufsize);
 762         }
 763         assert(loaded < bufsize);
 764         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 765                 rfds, &sz);
 766         loaded += sz;
 767         ret2 = for_each_stat_item(buf, loaded, update_item);
 768         if (ret < 0 || ret2 < 0) {
 769                 loaded = 0;
 770                 return ret2 < 0? ret2 : ret;
 771         }
 772         sz = ret2; /* what is left */
 773         if (sz > 0 && sz < loaded)
 774                 memmove(buf, buf + loaded - sz, sz);
 775         loaded = sz;
 776         return 1;
 777 }
 778
 779 static void print_all_items(void)
 780 {
 781         int i;
 782
 783         if (!curses_active)
 784                 return;
 785         FOR_EACH_STATUS_ITEM(i)
 786                 print_stat_item(i);
 787 }
 788
 789 static void clear_all_items(void)
 790 {
 791         int i;
 792
 793         FOR_EACH_STATUS_ITEM(i) {
 794                 free(stat_content[i]);
 795                 stat_content[i] = para_strdup("");
 796         }
 797 }
 798
 799 static void init_pair_or_die(short pair, short f, short b)
 800 {
 801         if (init_pair(pair, f, b) == ERR)
 802                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 803 }
 804
 805 static void init_colors_or_die(void)
 806 {
 807         int i;
 808
 809         if (!has_colors())
 810                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 811         if (start_color() == ERR)
 812                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 813         FOR_EACH_STATUS_ITEM(i)
 814                 if (theme.data[i].len)
 815                         init_pair_or_die(i + 1, theme.data[i].fg,
 816                                 theme.data[i].bg);
 817         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 818         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 819         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 820         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 821         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 822         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 823         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 824         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 825         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 826 }
 827
 828 /* (Re-)initialize the curses library. */
 829 static void init_curses(void)
 830 {
 831         curses_active = true;
 832         if (top.win && refresh() == ERR) /* refresh is really needed */
 833                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 834         if (LINES < theme.lines_min || COLS < theme.cols_min)
 835                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 836                         " (need at least %dx%d)\n", COLS, LINES,
 837                         theme.cols_min, theme.lines_min);
 838         curs_set(0); /* make cursor invisible, ignore errors */
 839         nonl(); /* do not NL->CR/NL on output, always returns OK */
 840         /* don't echo input */
 841         if (noecho() == ERR)
 842                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 843         /* take input chars one at a time, no wait for \n */
 844         if (cbreak() == ERR)
 845                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 846         init_colors_or_die();
 847         clear(); /* ignore non-fatal errors */
 848         init_wins(theme.top_lines_default);
 849         print_all_items();
 850         // noecho(); /* don't echo input */
 851 }
 852
 853 static void check_sigchld(void)
 854 {
 855         int ret;
 856         pid_t pid;
 857
 858 reap_next_child:
 859         ret = para_reap_child(&pid);
 860         if (ret <= 0)
 861                 return;
 862         if (pid == cmd_pid)
 863                 cmd_pid = 0;
 864         goto reap_next_child;
 865 }
 866
 867 /*
 868  * This sucker modifies its first argument. *handler and *arg are
 869  * pointers to 0-terminated strings (inside line). Crap.
 870  */
 871 static int split_key_map(char *line, char **handler, char **arg)
 872 {
 873         if (!(*handler = strchr(line + 1, ':')))
 874                 goto err_out;
 875         **handler = '\0';
 876         (*handler)++;
 877         if (!(*arg = strchr(*handler, ':')))
 878                 goto err_out;
 879         **arg = '\0';
 880         (*arg)++;
 881         return 1;
 882 err_out:
 883         return 0;
 884 }
 885
 886 static int check_key_map_args(void)
 887 {
 888         char *s;
 889         int i, ret = -1;
 890         char *tmp = NULL, *handler, *arg;
 891
 892         for (i = 0; i < conf.key_map_given; ++i) {
 893                 s = conf.key_map_arg[i];
 894                 if (!(*s))
 895                         goto out;
 896                 free(tmp);
 897                 tmp = para_strdup(s);
 898                 if (!split_key_map(tmp, &handler, &arg))
 899                         goto out;
 900                 if (strlen(handler) != 1)
 901                         goto out;
 902                 if (*handler != 'x'
 903                         && *handler != 'd'
 904                         && *handler != 'i'
 905                         && *handler != 'p')
 906                         goto out;
 907                 if (*handler != 'i')
 908                         continue;
 909                 if (find_cmd_byname(arg) < 0)
 910                         goto out;
 911         }
 912         ret = 0;
 913 out:
 914         free(tmp);
 915         return ret;
 916 }
 917
 918 /*
 919  * React to various signal-related events
 920  */
 921 static void handle_signal(int sig)
 922 {
 923         switch (sig) {
 924         case SIGTERM:
 925                 msg_n_exit(EXIT_FAILURE,
 926                         "only the good die young (caught SIGTERM))\n");
 927                 return;
 928         case SIGWINCH:
 929                 if (curses_active) {
 930                         shutdown_curses();
 931                         init_curses();
 932                         redraw_bot_win();
 933                 }
 934                 return;
 935         case SIGINT:
 936                 PARA_WARNING_LOG("caught SIGINT, reset\n");
 937                 /* Nothing to do. SIGINT killed our child which gets noticed
 938                  * by do_select and resets everything.
 939                  */
 940                 return;
 941         case SIGUSR1:
 942                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
 943                 com_reread_conf();
 944                 return;
 945         case SIGCHLD:
 946                 check_sigchld();
 947                 return;
 948         }
 949 }
 950
 951 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 952 {
 953         static struct timeval next_exec, atm, diff;
 954         int ret, fds[3] = {0, 1, 0};
 955         pid_t pid;
 956
 957         if (stat_pipe >= 0)
 958                 goto success;
 959         /* Avoid busy loop */
 960         gettimeofday(&atm, NULL);
 961         if (tv_diff(&next_exec, &atm, &diff) > 0) {
 962                 if (tv_diff(&diff, tv, NULL) < 0)
 963                         *tv = diff;
 964                 return;
 965         }
 966         next_exec.tv_sec = atm.tv_sec + 2;
 967         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 968         if (ret < 0)
 969                 return;
 970         ret = mark_fd_nonblocking(fds[1]);
 971         if (ret < 0) {
 972                 close(fds[1]);
 973                 return;
 974         }
 975         stat_pipe = fds[1];
 976 success:
 977         para_fd_set(stat_pipe, rfds, max_fileno);
 978 }
 979
 980 #define COMMAND_BUF_SIZE 32768
 981
 982 /*
 983  * This is the core select loop. Besides the (internal) signal
 984  * pipe, the following other fds are checked according to the mode:
 985  *
 986  * GETCH_MODE: check stdin, return when key is pressed
 987  *
 988  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 989  * stdout and stderr or when any key is pressed.
 990  *
 991  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 992  * is running. During that time curses is disabled.  Returns when
 993  * cmd_pid == 0.
 994  */
 995 static int do_select(int mode)
 996 {
 997         fd_set rfds;
 998         int ret, i, max_fileno;
 999         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
1000         int cbo[2] = {0, 0}; /* command buf offsets */
1001         struct timeval tv;
1002         unsigned flags[2] = {0, 0}; /* for for_each_line() */
1003
1004 repeat:
1005         tv.tv_sec = conf.timeout_arg  / 1000;
1006         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
1007 //      ret = refresh_status();
1008         FD_ZERO(&rfds);
1009         max_fileno = 0;
1010         status_pre_select(&rfds, &max_fileno, &tv);
1011         /* signal pipe */
1012         para_fd_set(signal_pipe, &rfds, &max_fileno);
1013         /* command pipe only for COMMAND_MODE */
1014         if (mode == COMMAND_MODE) {
1015                 if (command_fds[0] >= 0)
1016                         para_fd_set(command_fds[0], &rfds, &max_fileno);
1017                 if (command_fds[1] >= 0)
1018                         para_fd_set(command_fds[1], &rfds, &max_fileno);
1019         }
1020         if (mode == GETCH_MODE || mode == COMMAND_MODE)
1021                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1022         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1023         if (ret <= 0)
1024                 goto check_return; /* skip fd checks */
1025         /* signals */
1026         ret = para_next_signal(&rfds);
1027         if (ret > 0)
1028                 handle_signal(ret);
1029         /* read command pipe if ready */
1030         if (mode == COMMAND_MODE) {
1031                 for (i = 0; i < 2; i++) {
1032                         size_t sz;
1033                         if (command_fds[i] < 0)
1034                                 continue;
1035                         ret = read_nonblock(command_fds[i],
1036                                 command_buf[i] + cbo[i],
1037                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1038                         cbo[i] += sz;
1039                         sz = cbo[i];
1040                         cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1041                                 add_output_line, &i);
1042                         if (sz != cbo[i]) { /* at least one line found */
1043                                 wrefresh(bot.win);
1044                                 flags[i] = 0;
1045                         }
1046                         if (ret < 0) {
1047                                 PARA_NOTICE_LOG("closing command fd %d: %s\n",
1048                                         i, para_strerror(-ret));
1049                                 close(command_fds[i]);
1050                                 command_fds[i] = -1;
1051                                 flags[i] = 0;
1052                                 cbo[i] = 0;
1053                                 if (command_fds[!i] < 0) /* both fds closed */
1054                                         return 0;
1055                         }
1056                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1057                                 PARA_NOTICE_LOG("discarding overlong line\n");
1058                                 cbo[i] = 0;
1059                                 flags[i] = FELF_DISCARD_FIRST;
1060                         }
1061                 }
1062         }
1063         ret = read_stat_pipe(&rfds);
1064         if (ret < 0) {
1065                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1066                 close(stat_pipe);
1067                 stat_pipe = -1;
1068                 clear_all_items();
1069                 free(stat_content[SI_BASENAME]);
1070                 stat_content[SI_BASENAME] =
1071                         para_strdup("stat command terminated!?");
1072                 print_all_items();
1073         }
1074 check_return:
1075         switch (mode) {
1076         case COMMAND_MODE:
1077                 ret = wgetch(top.win);
1078                 if (ret != ERR && ret != KEY_RESIZE) {
1079                         if (cmd_pid)
1080                                 kill(cmd_pid, SIGTERM);
1081                         return -1;
1082                 }
1083                 break;
1084         case GETCH_MODE:
1085                 ret = wgetch(top.win);
1086                 if (ret != ERR && ret != KEY_RESIZE)
1087                         return ret;
1088                 break;
1089         case EXTERNAL_MODE:
1090                 if (cmd_pid == 0)
1091                         return 0;
1092         }
1093         goto repeat;
1094 }
1095
1096 /* read from command pipe and print data to bot window */
1097 static void exec_and_display_cmd(const char *cmd)
1098 {
1099         int ret, fds[3] = {0, 1, 1};
1100
1101         outputf(COLOR_COMMAND, "%s", cmd);
1102         ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1103         if (ret < 0)
1104                 return;
1105         ret = mark_fd_nonblocking(fds[1]);
1106         if (ret < 0)
1107                 goto fail;
1108         ret = mark_fd_nonblocking(fds[2]);
1109         if (ret < 0)
1110                 goto fail;
1111         command_fds[0] = fds[1];
1112         command_fds[1] = fds[2];
1113         if (do_select(COMMAND_MODE) >= 0)
1114                 PARA_INFO_LOG("command complete\n");
1115         else
1116                 PARA_NOTICE_LOG("command aborted\n");
1117         print_in_bar(COLOR_MSG, " ");
1118         return;
1119 fail:
1120         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1121         close(command_fds[0]);
1122         close(command_fds[1]);
1123 }
1124
1125 static void para_cmd(char *cmd)
1126 {
1127         char *c;
1128
1129         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1130         c = make_message(BINDIR "/para_client -- %s", cmd);
1131         exec_and_display_cmd(c);
1132         free(c);
1133 }
1134
1135 static void display_cmd(char *cmd)
1136 {
1137         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1138         exec_and_display_cmd(cmd);
1139 }
1140
1141 /*
1142  * shutdown curses and stat pipe before executing external commands
1143  */
1144 static void external_cmd(char *cmd)
1145 {
1146         int fds[3] = {-1, -1, -1};
1147
1148         if (cmd_pid)
1149                 return;
1150         shutdown_curses();
1151         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1152                 return;
1153         do_select(EXTERNAL_MODE);
1154         init_curses();
1155 }
1156
1157 static void print_scroll_msg(void)
1158 {
1159         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1160         int first_rbe = first_visible_rbe(&lines_total);
1161
1162         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1163                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1164 }
1165
1166 static void com_scroll_top(void)
1167 {
1168         int i = RINGBUFFER_SIZE - 1;
1169         unsigned lines = 0;
1170
1171         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1172                 i--;
1173         /* i is oldest entry */
1174         for (; lines < bot.lines && i >= 0; i--) {
1175                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1176                 if (!rbe)
1177                         break;
1178                 lines += NUM_LINES(rbe->len);
1179         }
1180         i++;
1181         if (lines > 0 && scroll_position != i) {
1182                 scroll_position = i;
1183                 redraw_bot_win();
1184                 print_scroll_msg();
1185                 return;
1186         }
1187         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1188 }
1189
1190 static void com_cancel_scrolling(void)
1191 {
1192
1193         if (scroll_position == 0) {
1194                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1195                 return;
1196         }
1197         scroll_position = 0;
1198         redraw_bot_win();
1199 }
1200
1201 static void com_page_down(void)
1202 {
1203         unsigned lines = 0;
1204         int i = scroll_position;
1205
1206         while (lines < bot.lines && --i > 0) {
1207                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1208                 if (!rbe)
1209                         break;
1210                 lines += NUM_LINES(rbe->len);
1211         }
1212         if (lines) {
1213                 scroll_position = i;
1214                 redraw_bot_win();
1215                 print_scroll_msg();
1216                 return;
1217         }
1218         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1219 }
1220
1221 static void com_page_up(void)
1222 {
1223         unsigned lines;
1224         int fvr = first_visible_rbe(&lines);
1225
1226         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1227                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1228                 return;
1229         }
1230         scroll_position = fvr + 1;
1231         for (; scroll_position > 0; scroll_position--) {
1232                 first_visible_rbe(&lines);
1233                 if (lines == bot.lines)
1234                         break;
1235         }
1236         redraw_bot_win();
1237         print_scroll_msg();
1238 }
1239
1240 static void com_scroll_down(void)
1241 {
1242         struct rb_entry *rbe;
1243         int rbe_lines;
1244
1245         if (!scroll_position) {
1246                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1247                 return;
1248         }
1249         scroll_position--;
1250         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1251         rbe_lines = NUM_LINES(rbe->len);
1252         wscrl(bot.win, rbe_lines);
1253         wmove(bot.win, bot.lines - rbe_lines, 0);
1254         wattron(bot.win, COLOR_PAIR(rbe->color));
1255         waddstr(bot.win, rbe->msg);
1256         wrefresh(bot.win);
1257         print_scroll_msg();
1258 }
1259
1260 static void com_scroll_up(void)
1261 {
1262         struct rb_entry *rbe = NULL;
1263         unsigned lines;
1264         int i, first_rbe, num_scroll;
1265
1266         /* the entry that is going to vanish */
1267         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1268         if (!rbe)
1269                 goto err_out;
1270         num_scroll = NUM_LINES(rbe->len);
1271         first_rbe = first_visible_rbe(&lines);
1272         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1273                 goto err_out;
1274         scroll_position++;
1275         wscrl(bot.win, -num_scroll);
1276         i = draw_top_rbe(&lines);
1277         if (i < 0)
1278                 goto err_out;
1279         while (i > 0 && lines < num_scroll) {
1280                 int rbe_lines;
1281                 rbe = ringbuffer_get(bot_win_rb, --i);
1282                 if (!rbe)
1283                         break;
1284                 rbe_lines = NUM_LINES(rbe->len);
1285                 lines += rbe_lines;
1286 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1287                 wattron(bot.win, COLOR_PAIR(rbe->color));
1288                 waddstr(bot.win, "\n");
1289                 waddstr(bot.win, rbe->msg);
1290                 if (!i)
1291                         break;
1292                 i--;
1293         }
1294         wrefresh(bot.win);
1295         print_scroll_msg();
1296         return;
1297 err_out:
1298         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1299 }
1300
1301 static void com_ll_decr(void)
1302 {
1303         if (loglevel <= LL_DEBUG) {
1304                 print_in_bar(COLOR_ERRMSG,
1305                         "loglevel already at maximal verbosity\n");
1306                 return;
1307         }
1308         loglevel--;
1309         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1310 }
1311
1312 static void com_ll_incr(void)
1313 {
1314         if (loglevel >= LL_EMERG) {
1315                 print_in_bar(COLOR_ERRMSG,
1316                         "loglevel already at minimal verbosity\n");
1317                 return;
1318         }
1319         loglevel++;
1320         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1321 }
1322
1323 /*
1324  * reread configuration, terminate on errors
1325  */
1326 static void com_reread_conf(void)
1327 {
1328         char *cf = configfile_exists();
1329         struct gui_cmdline_parser_params params = {
1330                 .override = 1,
1331                 .initialize = 1,
1332                 .check_required = 0,
1333                 .check_ambiguity = 0,
1334                 .print_errors = 0,
1335         };
1336
1337         if (!cf) {
1338                 PARA_WARNING_LOG("there is no configuration to read\n");
1339                 return;
1340         }
1341         PARA_INFO_LOG("rereading command line options and config file\n");
1342         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1343         /*
1344          * Despite .print_errors is set to 0, gengetopt will print to stderr
1345          * anyway, and exit on errors. So we have to shutdown curses first.
1346          */
1347         shutdown_curses();
1348         gui_cmdline_parser_config_file(cf, &conf, &params);
1349         init_curses();
1350         PARA_NOTICE_LOG("config file reloaded\n");
1351         if (check_key_map_args() < 0)
1352                 finish(EXIT_FAILURE);
1353 }
1354
1355 static void com_help(void)
1356 {
1357         int i;
1358
1359         for (i = 0; i < conf.key_map_given; ++i) {
1360                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1361                 const char *handler_text = "???", *desc = NULL;
1362
1363                 if (!split_key_map(tmp, &handler, &arg)) {
1364                         free(tmp);
1365                         return;
1366                 }
1367                 switch (*handler) {
1368                         case 'i':
1369                                 handler_text = "internal";
1370                                 desc = command_list[find_cmd_byname(arg)].description;
1371                                 break;
1372                         case 'x': handler_text = "external"; break;
1373                         case 'd': handler_text = "display "; break;
1374                         case 'p': handler_text = "para    "; break;
1375                 }
1376                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1377                         strlen(arg) < 8? "\t" : "",
1378                         desc? desc : "");
1379                 free(tmp);
1380         }
1381         for (i = 0; command_list[i].handler; i++) {
1382                 struct gui_command gc = command_list[i];
1383
1384                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1385                         strlen(gc.name) < 8? "\t" : "",
1386                         gc.description);
1387         }
1388         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1389                 "for more info");
1390 }
1391
1392 static void com_shrink_top_win(void)
1393 {
1394         if (top.lines <= theme.top_lines_min) {
1395                 PARA_WARNING_LOG("can not decrease top window\n");
1396                 return;
1397         }
1398         init_wins(top.lines - 1);
1399         wclear(top.win);
1400         print_all_items();
1401         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1402 }
1403
1404 static void com_enlarge_top_win(void)
1405 {
1406         if (bot.lines < 3) {
1407                 PARA_WARNING_LOG("can not increase top window\n");
1408                 return;
1409         }
1410         init_wins(top.lines + 1);
1411         wclear(top.win);
1412         print_all_items();
1413         print_in_bar(COLOR_MSG, "increased top window");
1414 }
1415
1416 static void com_version(void)
1417 {
1418         print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1419 }
1420
1421 __noreturn static void com_quit(void)
1422 {
1423         finish(0);
1424 }
1425
1426 static void com_refresh(void)
1427 {
1428         shutdown_curses();
1429         init_curses();
1430 }
1431
1432 static void change_theme(int next)
1433 {
1434         if (next)
1435                 next_theme(&theme);
1436         else
1437                 prev_theme(&theme);
1438         /* This seems to be needed twice, why? */
1439         com_refresh();
1440         com_refresh();
1441         PARA_NOTICE_LOG("new theme: %s\n", theme.name);
1442 }
1443
1444 static void com_next_theme(void)
1445 {
1446         change_theme(1);
1447 }
1448
1449 static void com_prev_theme(void)
1450 {
1451         change_theme(0);
1452 }
1453
1454
1455 static void handle_command(int c)
1456 {
1457         int i;
1458
1459         /* first check user-defined key bindings */
1460         for (i = 0; i < conf.key_map_given; ++i) {
1461                 char *tmp, *handler, *arg;
1462
1463                 tmp = para_strdup(conf.key_map_arg[i]);
1464                 if (!split_key_map(tmp, &handler, &arg)) {
1465                         free(tmp);
1466                         return;
1467                 }
1468                 if (strcmp(tmp, km_keyname(c))) {
1469                         free(tmp);
1470                         continue;
1471                 }
1472                 if (*handler == 'd')
1473                         display_cmd(arg);
1474                 else if (*handler == 'x')
1475                         external_cmd(arg);
1476                 else if (*handler == 'p')
1477                         para_cmd(arg);
1478                 else if (*handler == 'i') {
1479                         int num = find_cmd_byname(arg);
1480                         if (num >= 0)
1481                                 command_list[num].handler();
1482                 }
1483                 free(tmp);
1484                 return;
1485         }
1486         /* not found, check internal key bindings */
1487         for (i = 0; command_list[i].handler; i++) {
1488                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1489                         command_list[i].handler();
1490                         return;
1491                 }
1492         }
1493         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1494                 km_keyname(c));
1495 }
1496
1497 __noreturn static void print_help_and_die(void)
1498 {
1499         struct ggo_help h = DEFINE_GGO_HELP(gui);
1500         bool d = conf.detailed_help_given;
1501
1502         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1503         exit(0);
1504 }
1505
1506 int main(int argc, char *argv[])
1507 {
1508         int ret;
1509         char *cf;
1510
1511         _argc = argc;
1512         _argv = argv;
1513
1514         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1515         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1516         version_handle_flag("gui", conf.version_given);
1517         if (conf.help_given || conf.detailed_help_given)
1518                 print_help_and_die();
1519         cf = configfile_exists();
1520         if (!cf && conf.config_file_given) {
1521                 fprintf(stderr, "can not read config file %s\n",
1522                         conf.config_file_arg);
1523                 exit(EXIT_FAILURE);
1524         }
1525         if (cf) {
1526                 struct gui_cmdline_parser_params params = {
1527                         .override = 0,
1528                         .initialize = 0,
1529                         .check_required = 0,
1530                         .check_ambiguity = 0,
1531                         .print_errors = 1,
1532                 };
1533                 gui_cmdline_parser_config_file(cf, &conf, &params);
1534                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1535         }
1536         if (check_key_map_args() < 0) {
1537                 fprintf(stderr, "invalid key map\n");
1538                 exit(EXIT_FAILURE);
1539         }
1540         init_theme_or_die(conf.theme_arg, &theme);
1541         setup_signal_handling();
1542         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1543         setlocale(LC_CTYPE, "");
1544         initscr(); /* needed only once, always successful */
1545         init_curses();
1546         print_welcome();
1547         for (;;) {
1548                 print_status_bar();
1549                 ret = do_select(GETCH_MODE);
1550                 if (!ret)
1551                         continue;
1552                 print_in_bar(COLOR_MSG, " ");
1553                 handle_command(ret);
1554         }
1555 }