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