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