gui.c

   1 /*
   2  * Copyright (C) 1998-2013 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 curses_active;
  54 static pid_t cmd_pid;
  55
  56 static int command_fds[2];
  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 /* Print given number of spaces to curses window. */
 291 static void add_spaces(WINDOW* win, unsigned int num)
 292 {
 293         char space[] = "                                ";
 294         unsigned sz = sizeof(space);
 295
 296         while (num >= sz)  {
 297                 waddstr(win, space);
 298                 num -= sz;
 299         }
 300         if (num > 0) {
 301                 assert(num < sz);
 302                 space[num] = '\0';
 303                 waddstr(win, space);
 304         }
 305 }
 306
 307 /*
 308  * print aligned string to curses window. This function always prints
 309  * exactly len chars.
 310  */
 311 static int align_str(WINDOW* win, char *str, unsigned int len,
 312                 unsigned int align)
 313 {
 314         int i, num; /* of spaces */
 315
 316         if (!win || !str)
 317                 return -1;
 318         num = len - strlen(str);
 319         if (num < 0) {
 320                 str[len] = '\0';
 321                 num = 0;
 322         }
 323         /* replace control characters by spaces */
 324         for (i = 0; i < len && str[i]; i++) {
 325                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 326                         str[i] = ' ';
 327         }
 328         if (align == LEFT) {
 329                 waddstr(win, str);
 330                 add_spaces(win, num);
 331         } else if (align == RIGHT) {
 332                 add_spaces(win, num);
 333                 waddstr(win, str);
 334         } else {
 335                 add_spaces(win, num / 2);
 336                 waddstr(win, str[0]? str: "");
 337                 add_spaces(win, num - num / 2);
 338         }
 339         return 1;
 340 }
 341
 342 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 343 {
 344         char *msg;
 345         va_list ap;
 346
 347         if (!curses_active)
 348                 return;
 349         wattron(in.win, COLOR_PAIR(color));
 350         va_start(ap, fmt);
 351         xvasprintf(&msg, fmt, ap);
 352         va_end(ap);
 353         wmove(in.win, 0, 0);
 354         align_str(in.win, msg, sb.cols, LEFT);
 355         free(msg);
 356         wrefresh(in.win);
 357 }
 358
 359 /*
 360  * update the status bar
 361  */
 362 static void print_status_bar(void)
 363 {
 364         char *tmp;
 365
 366         if (!curses_active)
 367                 return;
 368         tmp = para_strdup(STANDARD_STATUS_BAR);
 369         wmove(sb.win, 0, 0);
 370         align_str(sb.win, tmp, sb.cols, CENTER);
 371         free(tmp);
 372         wrefresh(sb.win);
 373 }
 374
 375 /*
 376  * get the number of the oldest rbe that is (partially) visible. On return,
 377  * lines contains the sum of the number of lines of all visable entries. If the
 378  * first one is only partially visible, lines is greater than bot.lines.
 379  */
 380 static int first_visible_rbe(unsigned *lines)
 381 {
 382         int i;
 383         *lines = 0;
 384         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 385                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 386                 int rbe_lines;
 387                 if (!rbe)
 388                         return i - 1;
 389 //              fprintf(stderr, "found: %s\n", rbe->msg);
 390                 rbe_lines = NUM_LINES(rbe->len);
 391                 if (rbe_lines > bot.lines)
 392                         return -1;
 393                 *lines += rbe_lines;
 394                 if (*lines >= bot.lines)
 395                         return i;
 396         }
 397         return RINGBUFFER_SIZE - 1;
 398 }
 399
 400 static int draw_top_rbe(unsigned *lines)
 401 {
 402         unsigned len;
 403         int offset, fvr = first_visible_rbe(lines);
 404         struct rb_entry *rbe;
 405
 406         if (fvr < 0)
 407                 return -1;
 408         wmove(bot.win, 0, 0);
 409         rbe = ringbuffer_get(bot_win_rb, fvr);
 410         if (!rbe)
 411                 return -1;
 412         len = strlen(rbe->msg);
 413         if (*lines > bot.lines) {
 414                 /* first rbe is only partially visible */
 415                 offset = (*lines - bot.lines) * bot.cols;
 416                 assert(offset <= len);
 417         } else
 418                 offset = 0;
 419         wattron(bot.win, COLOR_PAIR(rbe->color));
 420         waddstr(bot.win, rbe->msg + offset);
 421         *lines = NUM_LINES(len - offset);
 422         return fvr;
 423 }
 424
 425 static void redraw_bot_win(void)
 426 {
 427         unsigned lines;
 428         int i;
 429
 430         wmove(bot.win, 0, 0);
 431         wclear(bot.win);
 432         i = draw_top_rbe(&lines);
 433         if (i <= 0)
 434                 goto out;
 435         while (i > 0 && lines < bot.lines) {
 436                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 437                 if (!rbe) {
 438                         lines++;
 439                         waddstr(bot.win, "\n");
 440                         continue;
 441                 }
 442                 lines += NUM_LINES(rbe->len);
 443                 wattron(bot.win, COLOR_PAIR(rbe->color));
 444                 waddstr(bot.win, "\n");
 445                 waddstr(bot.win, rbe->msg);
 446         }
 447 out:
 448         wrefresh(bot.win);
 449 }
 450
 451 static void rb_add_entry(int color, char *msg)
 452 {
 453         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 454         int x, y;
 455         new->color = color;
 456         new->len = strlen(msg);
 457         new->msg = msg;
 458         old = ringbuffer_add(bot_win_rb, new);
 459 //      fprintf(stderr, "added: %s\n", new->msg);
 460         if (old) {
 461                 free(old->msg);
 462                 free(old);
 463         }
 464         if (scroll_position) {
 465                 /* discard current scrolling, like xterm does */
 466                 scroll_position = 0;
 467                 redraw_bot_win();
 468                 return;
 469         }
 470         wattron(bot.win, COLOR_PAIR(color));
 471         getyx(bot.win, y, x);
 472         if (y || x)
 473                 waddstr(bot.win, "\n");
 474         waddstr(bot.win, msg);
 475 }
 476
 477 /*
 478  * print formated output to bot win and refresh
 479  */
 480 __printf_2_3 static void outputf(int color, const char* fmt,...)
 481 {
 482         char *msg;
 483         va_list ap;
 484
 485         if (!curses_active)
 486                 return;
 487         va_start(ap, fmt);
 488         xvasprintf(&msg, fmt, ap);
 489         va_end(ap);
 490         rb_add_entry(color, msg);
 491         wrefresh(bot.win);
 492 }
 493
 494 static int add_output_line(char *line, void *data)
 495 {
 496         int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 497         if (!curses_active)
 498                 return 1;
 499         rb_add_entry(color, para_strdup(line));
 500         return 1;
 501 }
 502
 503 static int loglevel;
 504
 505 __printf_2_3 void curses_log(int ll, const char *fmt,...)
 506 {
 507         int color;
 508         char *msg;
 509         va_list ap;
 510
 511         if (ll < loglevel || !curses_active)
 512                 return;
 513         switch (ll) {
 514                 case LL_DEBUG:
 515                 case LL_INFO:
 516                 case LL_NOTICE:
 517                         color = COLOR_MSG;
 518                         break;
 519                 default:
 520                         color = COLOR_ERRMSG;
 521         }
 522         va_start(ap, fmt);
 523         xvasprintf(&msg, fmt, ap);
 524         va_end(ap);
 525         chop(msg);
 526         rb_add_entry(color, msg);
 527         wrefresh(bot.win);
 528 }
 529 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 530
 531 static void setup_signal_handling(void)
 532 {
 533         signal_pipe = para_signal_init();
 534         para_install_sighandler(SIGINT);
 535         para_install_sighandler(SIGTERM);
 536         para_install_sighandler(SIGCHLD);
 537         para_install_sighandler(SIGWINCH);
 538         para_install_sighandler(SIGUSR1);
 539         para_sigaction(SIGHUP, SIG_IGN);
 540 }
 541
 542 /* kill every process in the process group and exit */
 543 __noreturn static void kill_pg_and_die(int ret)
 544 {
 545         para_sigaction(SIGTERM, SIG_IGN);
 546         kill(0, SIGTERM);
 547         exit(ret);
 548 }
 549
 550 static void shutdown_curses(void)
 551 {
 552         if (!curses_active)
 553                 return;
 554         def_prog_mode();
 555         curses_active = 0;
 556         endwin();
 557 }
 558
 559 __noreturn static void finish(int ret)
 560 {
 561         shutdown_curses();
 562         kill_pg_and_die(ret);
 563 }
 564
 565 /*
 566  * exit curses and print given message to stdout/stderr
 567  */
 568 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 569 {
 570         va_list argp;
 571         FILE *outfd = ret? stderr: stdout;
 572
 573         shutdown_curses();
 574         va_start(argp, fmt);
 575         vfprintf(outfd, fmt, argp);
 576         va_end(argp);
 577         kill_pg_and_die(ret);
 578 }
 579
 580 static void print_welcome(void)
 581 {
 582         if (loglevel > LL_NOTICE)
 583                 return;
 584         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 585                 " \"" CODENAME "\". Theme: %s", theme.name);
 586         wclrtoeol(bot.win);
 587 }
 588
 589 /*
 590  * init all windows
 591  */
 592 static void init_wins(int top_lines)
 593 {
 594         int i;
 595
 596         top.lines = top_lines;
 597         top.cols = COLS;
 598         top.begy = 0;
 599         top.begx = 0;
 600
 601         bot.lines = LINES - top.lines - 3;
 602         bot.cols = COLS;
 603         bot.begy = top.lines + 1;
 604         bot.begx = 0;
 605
 606         sb.lines = 1;
 607         sb.cols = COLS;
 608         sb.begy = LINES - 2;
 609         sb.begx = 0;
 610
 611         in.lines = 1;
 612         in.cols = COLS;
 613         in.begy = LINES - 1;
 614         in.begx = 0;
 615
 616         sep.lines = 1;
 617         sep.cols = COLS;
 618         sep.begy = top.lines;
 619         sep.begx = 0;
 620
 621         assume_default_colors(theme.default_fg, theme.default_bg);
 622         if (top.win) {
 623                 mvwin(top.win, top.begy, top.begx);
 624                 wresize(top.win, top.lines, top.cols);
 625
 626                 mvwin(sb.win, sb.begy, sb.begx);
 627                 wresize(sb.win, sb.lines, sb.cols);
 628
 629                 mvwin(sep.win, sep.begy, sep.begx);
 630                 wresize(sep.win, sep.lines, sep.cols);
 631
 632                 mvwin(bot.win, bot.begy, bot.begx);
 633                 wresize(bot.win, bot.lines, bot.cols);
 634
 635                 mvwin(in.win, in.begy, in.begx);
 636                 wresize(in.win, in.lines, in.cols);
 637         } else {
 638                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 639                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 640                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 641                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 642                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 643                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 644                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 645                 wclear(bot.win);
 646                 wclear(sb.win);
 647                 wclear(in.win);
 648                 scrollok(bot.win, 1);
 649                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 650                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 651                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 652                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 653                 nodelay(top.win, 1);
 654                 nodelay(bot.win, 1);
 655                 nodelay(sb.win, 1);
 656                 nodelay(in.win, 0);
 657
 658                 keypad(top.win, 1);
 659                 keypad(bot.win, 1);
 660                 keypad(sb.win, 1);
 661                 keypad(in.win, 1);
 662                 print_status_bar();
 663         }
 664         wmove(sep.win, 0, 0);
 665         for (i = 1; i <= COLS; i++)
 666                 waddstr(sep.win, theme.sep_str);
 667         wclear(top.win);
 668         //wclear(bot.win);
 669         wnoutrefresh(top.win);
 670         wnoutrefresh(bot.win);
 671         //wnoutrefresh(sb.win);
 672         print_status_bar();
 673         wnoutrefresh(in.win);
 674         wnoutrefresh(sep.win);
 675         doupdate();
 676 }
 677
 678 /*
 679  * Print stat item #i to curses window
 680  */
 681 static void print_stat_item(int i)
 682 {
 683         char *tmp;
 684         struct stat_item_data d = theme.data[i];
 685         char *c = stat_content[i];
 686
 687         if (!curses_active || !d.len || !c)
 688                 return;
 689         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 690         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 691         wrefresh(top.win);
 692         wattron(top.win, COLOR_PAIR(i + 1));
 693         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 694         free(tmp);
 695         wrefresh(top.win);
 696 }
 697
 698 static int update_item(int item_num, char *buf)
 699 {
 700         char **c = stat_content + item_num;
 701
 702         free(*c);
 703         if (buf && buf[0])
 704                 goto dup;
 705         switch (item_num) {
 706         case SI_ARTIST:
 707                 *c = para_strdup("(artist tag not set)");
 708                 goto print;
 709         case SI_TITLE:
 710                 *c = para_strdup("(title tag not set)");
 711                 goto print;
 712         case SI_YEAR:
 713                 *c = para_strdup("????");
 714                 goto print;
 715         case SI_ALBUM:
 716                 *c = para_strdup("(album tag not set)");
 717                 goto print;
 718         case SI_COMMENT:
 719                 *c = para_strdup("(comment tag not set)");
 720                 goto print;
 721         }
 722 dup:
 723         *c = para_strdup(buf);
 724 print:
 725         print_stat_item(item_num);
 726         return 1;
 727 }
 728
 729 static int read_stat_pipe(fd_set *rfds)
 730 {
 731         static char *buf;
 732         static int bufsize, loaded;
 733         int ret, ret2;
 734         size_t sz;
 735
 736         if (stat_pipe < 0)
 737                 return 0;
 738         if (loaded >= bufsize) {
 739                 if (bufsize > 1000 * 1000) {
 740                         loaded = 0;
 741                         return 0;
 742                 }
 743                 bufsize += bufsize + 1000;
 744                 buf = para_realloc(buf, bufsize);
 745         }
 746         assert(loaded < bufsize);
 747         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 748                 rfds, &sz);
 749         loaded += sz;
 750         ret2 = for_each_stat_item(buf, loaded, update_item);
 751         if (ret < 0 || ret2 < 0) {
 752                 loaded = 0;
 753                 return ret2 < 0? ret2 : ret;
 754         }
 755         sz = ret2; /* what is left */
 756         if (sz > 0 && sz < loaded)
 757                 memmove(buf, buf + loaded - sz, sz);
 758         loaded = sz;
 759         return 1;
 760 }
 761
 762 static void print_all_items(void)
 763 {
 764         int i;
 765
 766         if (!curses_active)
 767                 return;
 768         FOR_EACH_STATUS_ITEM(i)
 769                 print_stat_item(i);
 770 }
 771
 772 static void clear_all_items(void)
 773 {
 774         int i;
 775
 776         FOR_EACH_STATUS_ITEM(i) {
 777                 free(stat_content[i]);
 778                 stat_content[i] = para_strdup("");
 779         }
 780 }
 781
 782 static void init_pair_or_die(short pair, short f, short b)
 783 {
 784         if (init_pair(pair, f, b) == ERR)
 785                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 786 }
 787
 788 static void init_colors_or_die(void)
 789 {
 790         int i;
 791
 792         if (!has_colors())
 793                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 794         if (start_color() == ERR)
 795                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 796         FOR_EACH_STATUS_ITEM(i)
 797                 if (theme.data[i].len)
 798                         init_pair_or_die(i + 1, theme.data[i].fg,
 799                                 theme.data[i].bg);
 800         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 801         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 802         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 803         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 804         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 805         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 806         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 807         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 808         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 809 }
 810
 811 /* (Re-)initialize the curses library. */
 812 static void init_curses(void)
 813 {
 814         curses_active = 1;
 815         if (top.win && refresh() == ERR) /* refesh is really needed */
 816                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 817         if (LINES < theme.lines_min || COLS < theme.cols_min)
 818                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 819                         " (need at least %dx%d)\n", COLS, LINES,
 820                         theme.cols_min, theme.lines_min);
 821         curs_set(0); /* make cursor invisible, ignore errors */
 822         nonl(); /* do not NL->CR/NL on output, always returns OK */
 823         /* don't echo input */
 824         if (noecho() == ERR)
 825                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 826         /* take input chars one at a time, no wait for \n */
 827         if (cbreak() == ERR)
 828                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 829         init_colors_or_die();
 830         clear(); /* ignore non-fatal errors */
 831         init_wins(theme.top_lines_default);
 832         print_all_items();
 833         // noecho(); /* don't echo input */
 834 }
 835
 836 static void check_sigchld(void)
 837 {
 838         int ret;
 839         pid_t pid;
 840 reap_next_child:
 841         ret = para_reap_child(&pid);
 842         if (ret <= 0)
 843                 return;
 844         if (pid == cmd_pid)
 845                 cmd_pid = 0;
 846         goto reap_next_child;
 847 }
 848
 849 /*
 850  * This sucker modifies its first argument. *handler and *arg are
 851  * pointers to 0-terminated strings (inside line). Crap.
 852  */
 853 static int split_key_map(char *line, char **handler, char **arg)
 854 {
 855         if (!(*handler = strchr(line + 1, ':')))
 856                 goto err_out;
 857         **handler = '\0';
 858         (*handler)++;
 859         if (!(*arg = strchr(*handler, ':')))
 860                 goto err_out;
 861         **arg = '\0';
 862         (*arg)++;
 863         return 1;
 864 err_out:
 865         return 0;
 866 }
 867
 868 static int check_key_map_args(void)
 869 {
 870         char *s;
 871         int i, ret = -1;
 872         char *tmp = NULL, *handler, *arg;
 873
 874         for (i = 0; i < conf.key_map_given; ++i) {
 875                 s = conf.key_map_arg[i];
 876                 if (!(*s))
 877                         goto err_out;
 878                 free(tmp);
 879                 tmp = para_strdup(s);
 880                 if (!split_key_map(tmp, &handler, &arg))
 881                         goto err_out;
 882                 if (strlen(handler) != 1)
 883                         goto err_out;
 884                 if (*handler != 'x'
 885                         && *handler != 'd'
 886                         && *handler != 'i'
 887                         && *handler != 'p')
 888                         goto err_out;
 889                 if (*handler != 'i')
 890                         continue;
 891                 if (find_cmd_byname(arg) < 0)
 892                         goto err_out;
 893         }
 894         ret = 0;
 895 err_out:
 896         free(tmp);
 897         return ret;
 898 }
 899
 900 /*
 901  * React to various signal-related events
 902  */
 903 static void handle_signal(int sig)
 904 {
 905         switch (sig) {
 906         case SIGTERM:
 907                 msg_n_exit(EXIT_FAILURE,
 908                         "only the good die young (caught SIGTERM))\n");
 909                 return;
 910         case SIGWINCH:
 911                 if (curses_active) {
 912                         shutdown_curses();
 913                         init_curses();
 914                         redraw_bot_win();
 915                 }
 916                 return;
 917         case SIGINT:
 918                 PARA_WARNING_LOG("caught SIGINT, reset");
 919                 /* Nothing to do. SIGINT killed our child which gets noticed
 920                  * by do_select and resets everything.
 921                  */
 922                 return;
 923         case SIGUSR1:
 924                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 925                 com_reread_conf();
 926                 return;
 927         case SIGCHLD:
 928                 check_sigchld();
 929                 return;
 930         }
 931 }
 932
 933 static int open_stat_pipe(void)
 934 {
 935         static int init = 1;
 936         int ret, fds[3] = {0, 1, 0};
 937         pid_t pid;
 938
 939         if (init)
 940                 init = 0;
 941         else
 942                 /*
 943                  * Sleep a bit to avoid a busy loop. As the call to sleep() may
 944                  * be interrupted by SIGCHLD, we simply wait until the call
 945                  * succeeds.
 946                  */
 947                 while (sleep(2))
 948                         ; /* nothing */
 949         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 950         if (ret < 0)
 951                 return ret;
 952         ret = mark_fd_nonblocking(fds[1]);
 953         if (ret >= 0)
 954                 return fds[1];
 955         close(fds[1]);
 956         return ret;
 957 }
 958
 959 #define COMMAND_BUF_SIZE 32768
 960
 961 /*
 962  * This is the core select loop. Besides the (internal) signal
 963  * pipe, the following other fds are checked according to the mode:
 964  *
 965  * GETCH_MODE: check stdin, return when key is pressed
 966  *
 967  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 968  * stdout and stderr or when any key is pressed.
 969  *
 970  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 971  * is running. During that time curses is disabled.  Returns when
 972  * cmd_pid == 0.
 973  */
 974 static int do_select(int mode)
 975 {
 976         fd_set rfds;
 977         int ret, i, max_fileno;
 978         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
 979         int cbo[2] = {0, 0}; /* command buf offsets */
 980         struct timeval tv;
 981
 982 repeat:
 983         tv.tv_sec = conf.timeout_arg  / 1000;
 984         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 985 //      ret = refresh_status();
 986         FD_ZERO(&rfds);
 987         max_fileno = 0;
 988         if (stat_pipe < 0)
 989                 stat_pipe = open_stat_pipe();
 990         if (stat_pipe >= 0)
 991                 para_fd_set(stat_pipe, &rfds, &max_fileno);
 992         /* signal pipe */
 993         para_fd_set(signal_pipe, &rfds, &max_fileno);
 994         /* command pipe only for COMMAND_MODE */
 995         if (mode == COMMAND_MODE) {
 996                 if (command_fds[0] >= 0)
 997                         para_fd_set(command_fds[0], &rfds, &max_fileno);
 998                 if (command_fds[1] >= 0)
 999                         para_fd_set(command_fds[1], &rfds, &max_fileno);
1000         }
1001         if (mode == GETCH_MODE || mode == COMMAND_MODE)
1002                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1003         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1004         if (ret <= 0)
1005                 goto check_return; /* skip fd checks */
1006         /* signals */
1007         ret = para_next_signal(&rfds);
1008         if (ret > 0)
1009                 handle_signal(ret);
1010         /* read command pipe if ready */
1011         if (mode == COMMAND_MODE) {
1012                 for (i = 0; i < 2; i++) {
1013                         size_t sz;
1014                         if (command_fds[i] < 0)
1015                                 continue;
1016                         ret = read_nonblock(command_fds[i],
1017                                 command_buf[i] + cbo[i],
1018                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1019                         cbo[i] += sz;
1020                         sz = cbo[i];
1021                         cbo[i] = for_each_line(command_buf[i], cbo[i],
1022                                 add_output_line, &i);
1023                         if (sz != cbo[i])
1024                                 wrefresh(bot.win);
1025                         if (ret < 0) {
1026                                 PARA_NOTICE_LOG("closing command fd %d: %s",
1027                                         i, para_strerror(-ret));
1028                                 close(command_fds[i]);
1029                                 command_fds[i] = -1;
1030                                 if (command_fds[!i] < 0) /* both fds closed */
1031                                         return 0;
1032                         }
1033                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1034                                 PARA_NOTICE_LOG("discarding overlong line");
1035                                 cbo[i] = 0;
1036                         }
1037                 }
1038         }
1039         ret = read_stat_pipe(&rfds);
1040         if (ret < 0) {
1041                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1042                 close(stat_pipe);
1043                 stat_pipe = -1;
1044                 clear_all_items();
1045                 free(stat_content[SI_BASENAME]);
1046                 stat_content[SI_BASENAME] =
1047                         para_strdup("stat command terminated!?");
1048                 print_all_items();
1049         }
1050 check_return:
1051         switch (mode) {
1052         case COMMAND_MODE:
1053                 ret = wgetch(top.win);
1054                 if (ret != ERR && ret != KEY_RESIZE) {
1055                         if (command_fds[0] >= 0) {
1056                                 close(command_fds[0]);
1057                                 command_fds[0] = -1;
1058                         }
1059                         if (command_fds[1] >= 0) {
1060                                 close(command_fds[1]);
1061                                 command_fds[1] = -1;
1062                         }
1063                         if (cmd_pid)
1064                                 kill(cmd_pid, SIGTERM);
1065                         return -1;
1066                 }
1067                 break;
1068         case GETCH_MODE:
1069                 ret = wgetch(top.win);
1070                 if (ret != ERR && ret != KEY_RESIZE)
1071                         return ret;
1072                 break;
1073         case EXTERNAL_MODE:
1074                 if (cmd_pid == 0)
1075                         return 0;
1076         }
1077         goto repeat;
1078 }
1079
1080 /*
1081  * read from command pipe and print data to bot window
1082  */
1083 static void send_output(void)
1084 {
1085         int ret;
1086
1087         ret = mark_fd_nonblocking(command_fds[0]);
1088         if (ret < 0)
1089                 goto fail;
1090         ret = mark_fd_nonblocking(command_fds[1]);
1091         if (ret < 0)
1092                 goto fail;
1093         if (do_select(COMMAND_MODE) >= 0)
1094                 PARA_INFO_LOG("command complete");
1095         else
1096                 PARA_NOTICE_LOG("command aborted");
1097         print_in_bar(COLOR_MSG, " ");
1098         return;
1099 fail:
1100         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1101         close(command_fds[0]);
1102         close(command_fds[1]);
1103 }
1104
1105 static void para_cmd(char *cmd)
1106 {
1107         int ret, fds[3] = {0, 1, 1};
1108         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1109
1110         outputf(COLOR_COMMAND, "%s", c);
1111         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1112         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1113         free(c);
1114         if (ret < 0)
1115                 return;
1116         command_fds[0] = fds[1];
1117         command_fds[1] = fds[2];
1118         send_output();
1119 }
1120
1121 /*
1122  * exec command and print output to bot win
1123  */
1124 static void display_cmd(char *cmd)
1125 {
1126         int fds[3] = {0, 1, 1};
1127
1128         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1129         outputf(COLOR_COMMAND, "%s", cmd);
1130         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1131                 return;
1132         command_fds[0] = fds[1];
1133         command_fds[1] = fds[2];
1134         send_output();
1135 }
1136
1137 /*
1138  * shutdown curses and stat pipe before executing external commands
1139  */
1140 static void external_cmd(char *cmd)
1141 {
1142         int fds[3] = {-1, -1, -1};
1143
1144         if (cmd_pid)
1145                 return;
1146         shutdown_curses();
1147         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1148                 return;
1149         do_select(EXTERNAL_MODE);
1150         init_curses();
1151 }
1152
1153 static void print_scroll_msg(void)
1154 {
1155         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1156         int first_rbe = first_visible_rbe(&lines_total);
1157         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1158                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1159 }
1160
1161 static void com_scroll_top(void)
1162 {
1163         int i = RINGBUFFER_SIZE - 1;
1164         unsigned lines = 0;
1165
1166         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1167                 i--;
1168         /* i is oldest entry */
1169         for (; lines < bot.lines && i >= 0; i--) {
1170                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1171                 if (!rbe)
1172                         break;
1173                 lines += NUM_LINES(strlen(rbe->msg));
1174         }
1175         i++;
1176         if (lines > 0 && scroll_position != i) {
1177                 scroll_position = i;
1178                 redraw_bot_win();
1179                 print_scroll_msg();
1180                 return;
1181         }
1182         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1183 }
1184
1185 static void com_cancel_scrolling(void)
1186 {
1187
1188         if (scroll_position == 0) {
1189                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1190                 return;
1191         }
1192         scroll_position = 0;
1193         redraw_bot_win();
1194 }
1195
1196 static void com_page_down(void)
1197 {
1198         unsigned lines = 0;
1199         int i = scroll_position;
1200         while (lines < bot.lines && --i > 0) {
1201                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1202                 if (!rbe)
1203                         break;
1204                 lines += NUM_LINES(strlen(rbe->msg));
1205         }
1206         if (lines) {
1207                 scroll_position = i;
1208                 redraw_bot_win();
1209                 print_scroll_msg();
1210                 return;
1211         }
1212         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1213 }
1214
1215 static void com_page_up(void)
1216 {
1217         unsigned lines;
1218         int fvr = first_visible_rbe(&lines);
1219
1220         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1221                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1222                 return;
1223         }
1224         scroll_position = fvr + 1;
1225         for (; scroll_position > 0; scroll_position--) {
1226                 first_visible_rbe(&lines);
1227                 if (lines == bot.lines)
1228                         break;
1229         }
1230         redraw_bot_win();
1231         print_scroll_msg();
1232 }
1233
1234 static void com_scroll_down(void)
1235 {
1236         struct rb_entry *rbe;
1237         int rbe_lines;
1238
1239         if (!scroll_position) {
1240                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1241                 return;
1242         }
1243         scroll_position--;
1244         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1245         rbe_lines = NUM_LINES(rbe->len);
1246         wscrl(bot.win, rbe_lines);
1247         wmove(bot.win, bot.lines - rbe_lines, 0);
1248         wattron(bot.win, COLOR_PAIR(rbe->color));
1249         waddstr(bot.win, rbe->msg);
1250         wrefresh(bot.win);
1251         print_scroll_msg();
1252 }
1253
1254 static void com_scroll_up(void)
1255 {
1256         struct rb_entry *rbe = NULL;
1257         unsigned lines;
1258         int i, first_rbe, num_scroll;
1259
1260         /* the entry that is going to vanish */
1261         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1262         if (!rbe)
1263                 goto err_out;
1264         num_scroll = NUM_LINES(rbe->len);
1265         first_rbe = first_visible_rbe(&lines);
1266         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1267                 goto err_out;
1268         scroll_position++;
1269         wscrl(bot.win, -num_scroll);
1270         i = draw_top_rbe(&lines);
1271         if (i < 0)
1272                 goto err_out;
1273         while (i > 0 && lines < num_scroll) {
1274                 int rbe_lines;
1275                 rbe = ringbuffer_get(bot_win_rb, --i);
1276                 if (!rbe)
1277                         break;
1278                 rbe_lines = NUM_LINES(rbe->len);
1279                 lines += rbe_lines;
1280 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1281                 wattron(bot.win, COLOR_PAIR(rbe->color));
1282                 waddstr(bot.win, "\n");
1283                 waddstr(bot.win, rbe->msg);
1284                 if (!i)
1285                         break;
1286                 i--;
1287         }
1288         wrefresh(bot.win);
1289         print_scroll_msg();
1290         return;
1291 err_out:
1292         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1293 }
1294
1295 static void com_ll_decr(void)
1296 {
1297         if (loglevel <= LL_DEBUG) {
1298                 print_in_bar(COLOR_ERRMSG,
1299                         "loglevel already at maximal verbosity\n");
1300                 return;
1301         }
1302         loglevel--;
1303         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1304 }
1305
1306 static void com_ll_incr(void)
1307 {
1308         if (loglevel >= LL_EMERG) {
1309                 print_in_bar(COLOR_ERRMSG,
1310                         "loglevel already at minimal verbosity\n");
1311                 return;
1312         }
1313         loglevel++;
1314         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1315 }
1316
1317 /*
1318  * reread configuration, terminate on errors
1319  */
1320 static void com_reread_conf(void)
1321 {
1322         char *cf =configfile_exists();
1323         struct gui_cmdline_parser_params params = {
1324                 .override = 1,
1325                 .initialize = 1,
1326                 .check_required = 0,
1327                 .check_ambiguity = 0,
1328                 .print_errors = 0,
1329         };
1330
1331         if (!cf) {
1332                 PARA_WARNING_LOG("there is no configuration to read");
1333                 return;
1334         }
1335         PARA_INFO_LOG("rereading command line options and config file");
1336         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1337         if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0) {
1338                 PARA_EMERG_LOG("errors in config file");
1339                 finish(EXIT_FAILURE);
1340         }
1341         PARA_NOTICE_LOG("config file reloaded");
1342         if (check_key_map_args() < 0)
1343                 finish(EXIT_FAILURE);
1344 }
1345
1346 static void com_help(void)
1347 {
1348         int i;
1349
1350         for (i = 0; i < conf.key_map_given; ++i) {
1351                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1352                 const char *handler_text = "???", *desc = NULL;
1353
1354                 if (!split_key_map(tmp, &handler, &arg)) {
1355                         free(tmp);
1356                         return;
1357                 }
1358                 switch (*handler) {
1359                         case 'i':
1360                                 handler_text = "internal";
1361                                 desc = command_list[find_cmd_byname(arg)].description;
1362                                 break;
1363                         case 'x': handler_text = "external"; break;
1364                         case 'd': handler_text = "display "; break;
1365                         case 'p': handler_text = "para    "; break;
1366                 }
1367                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1368                         strlen(arg) < 8? "\t" : "",
1369                         desc? desc : "");
1370                 free(tmp);
1371         }
1372         for (i = 0; command_list[i].handler; i++) {
1373                 struct gui_command gc = command_list[i];
1374
1375                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1376                         strlen(gc.name) < 8? "\t" : "",
1377                         gc.description);
1378         }
1379         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1380                 "for more info");
1381 }
1382
1383 static void com_shrink_top_win(void)
1384 {
1385         if (top.lines <= theme.top_lines_min) {
1386                 PARA_WARNING_LOG("can not decrease top window");
1387                 return;
1388         }
1389         init_wins(top.lines - 1);
1390         wclear(top.win);
1391         print_all_items();
1392         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1393 }
1394
1395 static void com_enlarge_top_win(void)
1396 {
1397         if (bot.lines < 3) {
1398                 PARA_WARNING_LOG("can not increase top window");
1399                 return;
1400         }
1401         init_wins(top.lines + 1);
1402         wclear(top.win);
1403         print_all_items();
1404         print_in_bar(COLOR_MSG, "increased top window");
1405 }
1406
1407 static void com_version(void)
1408 {
1409         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1410                 CODENAME "\"");
1411 }
1412
1413 __noreturn static void com_quit(void)
1414 {
1415         finish(0);
1416 }
1417
1418 static void com_refresh(void)
1419 {
1420         shutdown_curses();
1421         init_curses();
1422 }
1423
1424 static void change_theme(int next)
1425 {
1426         if (next)
1427                 next_theme(&theme);
1428         else
1429                 prev_theme(&theme);
1430         /* This seems to be needed twice, why? */
1431         com_refresh();
1432         com_refresh();
1433         PARA_NOTICE_LOG("new theme: %s", theme.name);
1434 }
1435
1436 static void com_next_theme(void)
1437 {
1438         change_theme(1);
1439 }
1440
1441 static void com_prev_theme(void)
1442 {
1443         change_theme(0);
1444 }
1445
1446
1447 static void handle_command(int c)
1448 {
1449         int i;
1450
1451         /* first check user's key bindings */
1452         for (i = 0; i < conf.key_map_given; ++i) {
1453                 char *tmp, *handler, *arg;
1454
1455                 tmp = para_strdup(conf.key_map_arg[i]);
1456                 if (!split_key_map(tmp, &handler, &arg)) {
1457                         free(tmp);
1458                         return;
1459                 }
1460                 if (strcmp(tmp, km_keyname(c))) {
1461                         free(tmp);
1462                         continue;
1463                 }
1464                 if (*handler == 'd')
1465                         display_cmd(arg);
1466                 else if (*handler == 'x')
1467                         external_cmd(arg);
1468                 else if (*handler == 'p')
1469                         para_cmd(arg);
1470                 else if (*handler == 'i') {
1471                         int num = find_cmd_byname(arg);
1472                         if (num >= 0)
1473                                 command_list[num].handler();
1474                 }
1475                 free(tmp);
1476                 return;
1477         }
1478         /* not found, check internal key bindings */
1479         for (i = 0; command_list[i].handler; i++) {
1480                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1481                         command_list[i].handler();
1482                         return;
1483                 }
1484         }
1485         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1486                 km_keyname(c));
1487 }
1488
1489 int main(int argc, char *argv[])
1490 {
1491         int ret;
1492         char *cf;
1493
1494         _argc = argc;
1495         _argv = argv;
1496
1497         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1498         HANDLE_VERSION_FLAG("gui", conf);
1499         cf = configfile_exists();
1500         if (!cf && conf.config_file_given) {
1501                 fprintf(stderr, "can not read config file %s\n",
1502                         conf.config_file_arg);
1503                 exit(EXIT_FAILURE);
1504         }
1505         if (cf) {
1506                 struct gui_cmdline_parser_params params = {
1507                         .override = 0,
1508                         .initialize = 0,
1509                         .check_required = 0,
1510                         .check_ambiguity = 0,
1511                         .print_errors = 1,
1512                 };
1513                 if (gui_cmdline_parser_config_file(cf, &conf, &params) != 0)
1514                         exit(EXIT_FAILURE);
1515         }
1516         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1517         if (check_key_map_args() < 0) {
1518                 fprintf(stderr, "invalid key map\n");
1519                 exit(EXIT_FAILURE);
1520         }
1521         init_theme_or_die(conf.theme_arg, &theme);
1522         top.lines = theme.top_lines_default;
1523         setup_signal_handling();
1524         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1525         initscr(); /* needed only once, always successful */
1526         init_curses();
1527         print_welcome();
1528         for (;;) {
1529                 print_status_bar();
1530                 ret = do_select(GETCH_MODE);
1531                 if (!ret)
1532                         continue;
1533                 print_in_bar(COLOR_MSG, " ");
1534                 handle_command(ret);
1535         }
1536 }