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 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  34
  35 static int signal_pipe;
  36
  37 static struct win_data {
  38         WINDOW *win;
  39         size_t begx;
  40         size_t begy;
  41         size_t cols;
  42         size_t lines;
  43 } top, bot, sb, in, sep;
  44
  45 #define RINGBUFFER_SIZE 512
  46 struct rb_entry {
  47         char *msg;
  48         size_t len;
  49         int color;
  50 };
  51 static struct ringbuffer *bot_win_rb;
  52 #define NUM_LINES(len) (1 + (len) / bot.cols)
  53
  54 static unsigned scroll_position;
  55
  56 static int curses_active;
  57 static pid_t cmd_pid;
  58
  59 static int command_fds[2] = {-1, -1};
  60 static int stat_pipe = -1;
  61 static struct gui_args_info conf;
  62
  63 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  64
  65
  66 #define COLOR_STATUSBAR 52
  67 #define COLOR_COMMAND 53
  68 #define COLOR_OUTPUT 54
  69 #define COLOR_MSG 55
  70 #define COLOR_ERRMSG 56
  71 #define COLOR_WELCOME 57
  72 #define COLOR_SEPARATOR 58
  73 #define COLOR_TOP 59
  74 #define COLOR_BOT 60
  75
  76 struct gui_command {
  77         const char *key;
  78         const char *name;
  79         const char *description;
  80         void (*handler)(void);
  81 };
  82
  83 static struct gui_theme theme;
  84
  85 static int _argc;
  86 static char **_argv;
  87
  88 static void com_help(void);
  89 static void com_reread_conf(void);
  90 static void com_enlarge_top_win(void);
  91 static void com_shrink_top_win(void);
  92 static void com_version(void);
  93 __noreturn static void com_quit(void);
  94 static void com_refresh(void);
  95 static void com_ll_incr(void);
  96 static void com_ll_decr(void);
  97 static void com_prev_theme(void);
  98 static void com_next_theme(void);
  99 static void com_scroll_up(void);
 100 static void com_scroll_down(void);
 101 static void com_page_up(void);
 102 static void com_page_down(void);
 103 static void com_cancel_scrolling(void);
 104 static void com_scroll_top(void);
 105
 106 static struct gui_command command_list[] = {
 107         {
 108                 .key = "?",
 109                 .name = "help",
 110                 .description = "print help",
 111                 .handler = com_help
 112         }, {
 113                 .key = "+",
 114                 .name = "enlarge_win",
 115                 .description = "enlarge the top window",
 116                 .handler = com_enlarge_top_win
 117         }, {
 118                 .key = "-",
 119                 .name = "shrink_win",
 120                 .description = "shrink the top window",
 121                 .handler = com_shrink_top_win
 122         }, {
 123                 .key = "r",
 124                 .name = "reread_conf",
 125                 .description = "reread configuration file",
 126                 .handler = com_reread_conf
 127         }, {
 128                 .key = "q",
 129                 .name = "quit",
 130                 .description = "exit para_gui",
 131                 .handler = com_quit
 132         }, {
 133                 .key = "^L",
 134                 .name = "refresh",
 135                 .description = "redraw the screen",
 136                 .handler = com_refresh
 137         }, {
 138                 .key = ".",
 139                 .name = "next_theme",
 140                 .description = "switch to next theme",
 141                 .handler = com_next_theme
 142         }, {
 143                 .key = ",",
 144                 .name = "prev_theme",
 145                 .description = "switch to previous stream",
 146                 .handler = com_prev_theme
 147         }, {
 148                 .key = ">",
 149                 .name = "ll_incr",
 150                 .description = "increase loglevel (decreases verbosity)",
 151                 .handler = com_ll_incr
 152         }, {
 153                 .key = "<",
 154                 .name = "ll_decr",
 155                 .description = "decrease loglevel (increases verbosity)",
 156                 .handler = com_ll_decr
 157         }, {
 158                 .key = "V",
 159                 .name = "version",
 160                 .description = "show the para_gui version",
 161                 .handler = com_version
 162         }, {
 163                 .key = "<up>",
 164                 .name = "scroll_up",
 165                 .description = "scroll up one line",
 166                 .handler = com_scroll_up
 167         }, {
 168                 .key = "<down>",
 169                 .name = "scroll_down",
 170                 .description = "scroll down one line",
 171                 .handler = com_scroll_down
 172         }, {
 173                 .key = "<ppage>",
 174                 .name = "page_up",
 175                 .description = "scroll up one page",
 176                 .handler = com_page_up
 177         }, {
 178                 .key = "<npage>",
 179                 .name = "page_down",
 180                 .description = "scroll down one page",
 181                 .handler = com_page_down
 182         }, {
 183                 .key = "<home>",
 184                 .name = "scroll_top",
 185                 .description = "scroll to top of buffer",
 186                 .handler = com_scroll_top
 187         }, {
 188                 .key = "<end>",
 189                 .name = "cancel_scroll",
 190                 .description = "deactivate scroll mode",
 191                 .handler = com_cancel_scrolling
 192         }, {
 193                 .handler = NULL
 194         }
 195 };
 196
 197 static int find_cmd_byname(char *name)
 198 {
 199         int i;
 200
 201         for (i = 0; command_list[i].handler; i++)
 202                 if (!strcmp(command_list[i].name, name))
 203                         return i;
 204         return -1;
 205 }
 206
 207 /* taken from mutt */
 208 static char *km_keyname(int c)
 209 {
 210         static char buf[10];
 211
 212         if (c == KEY_UP) {
 213                 sprintf(buf, "<up>");
 214                 return buf;
 215         }
 216         if (c == KEY_DOWN) {
 217                 sprintf(buf, "<down>");
 218                 return buf;
 219         }
 220         if (c == KEY_LEFT) {
 221                 sprintf(buf, "<left>");
 222                 return buf;
 223         }
 224         if (c == KEY_RIGHT) {
 225                 sprintf(buf, "<right>");
 226                 return buf;
 227         }
 228         if (c == KEY_NPAGE) {
 229                 sprintf(buf, "<npage>");
 230                 return buf;
 231         }
 232         if (c == KEY_PPAGE) {
 233                 sprintf(buf, "<ppage>");
 234                 return buf;
 235         }
 236         if (c == KEY_HOME) {
 237                 sprintf(buf, "<home>");
 238                 return buf;
 239         }
 240         if (c == KEY_END) {
 241                 sprintf(buf, "<end>");
 242                 return buf;
 243         }
 244         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 245                 if (c < 0)
 246                         c += 256;
 247                 if (c < 128) {
 248                         buf[0] = '^';
 249                         buf[1] = (c + '@') & 0x7f;
 250                         buf[2] = 0;
 251                 } else
 252                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 253                                 (c >> 3) & 7, c & 7);
 254         } else if (c >= KEY_F0 && c < KEY_F(256))
 255                 sprintf(buf, "<F%d>", c - KEY_F0);
 256         else if (isprint(c))
 257                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 258         else
 259                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 260         return buf;
 261 }
 262
 263 static char *configfile_exists(void)
 264 {
 265         static char *config_file;
 266         char *tmp;
 267
 268         if (!conf.config_file_given) {
 269                 if (!config_file) {
 270                         char *home = para_homedir();
 271                         config_file = make_message("%s/.paraslash/gui.conf",
 272                                 home);
 273                         free(home);
 274                 }
 275                 tmp = config_file;
 276         } else
 277                 tmp = conf.config_file_arg;
 278         return file_exists(tmp)? tmp: NULL;
 279 }
 280
 281 /* Print given number of spaces to curses window. */
 282 static void add_spaces(WINDOW* win, unsigned int num)
 283 {
 284         char space[] = "                                ";
 285         unsigned sz = sizeof(space) - 1; /* number of spaces */
 286
 287         while (num >= sz)  {
 288                 waddstr(win, space);
 289                 num -= sz;
 290         }
 291         if (num > 0) {
 292                 assert(num < sz);
 293                 space[num] = '\0';
 294                 waddstr(win, space);
 295         }
 296 }
 297
 298 /*
 299  * print aligned string to curses window. This function always prints
 300  * exactly len chars.
 301  */
 302 static int align_str(WINDOW* win, char *str, unsigned int len,
 303                 unsigned int align)
 304 {
 305         int ret, i, num; /* of spaces */
 306         size_t width;
 307
 308         if (!win || !str)
 309                 return 0;
 310         ret = strwidth(str, &width);
 311         if (ret < 0) {
 312                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 313                 width = 0;
 314                 str[0] = '\0';
 315         }
 316         num = len - width;
 317         if (num < 0) {
 318                 str[len] = '\0';
 319                 num = 0;
 320         }
 321         /* replace control characters by spaces */
 322         for (i = 0; i < len && str[i]; i++) {
 323                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 324                         str[i] = ' ';
 325         }
 326         if (align == LEFT) {
 327                 waddstr(win, str);
 328                 add_spaces(win, num);
 329         } else if (align == RIGHT) {
 330                 add_spaces(win, num);
 331                 waddstr(win, str);
 332         } else {
 333                 add_spaces(win, num / 2);
 334                 waddstr(win, str[0]? str: "");
 335                 add_spaces(win, num - num / 2);
 336         }
 337         return 1;
 338 }
 339
 340 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 341 {
 342         char *msg;
 343         va_list ap;
 344
 345         if (!curses_active)
 346                 return;
 347         wattron(in.win, COLOR_PAIR(color));
 348         va_start(ap, fmt);
 349         xvasprintf(&msg, fmt, ap);
 350         va_end(ap);
 351         wmove(in.win, 0, 0);
 352         align_str(in.win, msg, in.cols, LEFT);
 353         free(msg);
 354         wrefresh(in.win);
 355 }
 356
 357 /*
 358  * update the status bar
 359  */
 360 static void print_status_bar(void)
 361 {
 362         char *tmp;
 363
 364         if (!curses_active)
 365                 return;
 366         tmp = para_strdup(STANDARD_STATUS_BAR);
 367         wmove(sb.win, 0, 0);
 368         align_str(sb.win, tmp, sb.cols, CENTER);
 369         free(tmp);
 370         wrefresh(sb.win);
 371 }
 372
 373 /*
 374  * get the number of the oldest rbe that is (partially) visible. On return,
 375  * lines contains the sum of the number of lines of all visible entries. If the
 376  * first one is only partially visible, lines is greater than bot.lines.
 377  */
 378 static int first_visible_rbe(unsigned *lines)
 379 {
 380         int i;
 381         *lines = 0;
 382         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 383                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 384                 int rbe_lines;
 385                 if (!rbe)
 386                         return i - 1;
 387 //              fprintf(stderr, "found: %s\n", rbe->msg);
 388                 rbe_lines = NUM_LINES(rbe->len);
 389                 if (rbe_lines > bot.lines)
 390                         return -1;
 391                 *lines += rbe_lines;
 392                 if (*lines >= bot.lines)
 393                         return i;
 394         }
 395         return RINGBUFFER_SIZE - 1;
 396 }
 397
 398 /*
 399 returns number of first visible rbe, *lines is the number of lines drawn.
 400  */
 401 static int draw_top_rbe(unsigned *lines)
 402 {
 403         int ret, fvr = first_visible_rbe(lines);
 404         struct rb_entry *rbe;
 405         size_t bytes_to_skip, cells_to_skip, width;
 406
 407         if (fvr < 0)
 408                 return -1;
 409         wmove(bot.win, 0, 0);
 410         rbe = ringbuffer_get(bot_win_rb, fvr);
 411         if (!rbe)
 412                 return -1;
 413         if (*lines > bot.lines) {
 414                 /* rbe is partially visible multi-line */
 415                 cells_to_skip = (*lines - bot.lines) * bot.cols;
 416                 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
 417                 if (ret < 0)
 418                         return ret;
 419                 ret = strwidth(rbe->msg + bytes_to_skip, &width);
 420                 if (ret < 0)
 421                         return ret;
 422         } else {
 423                 bytes_to_skip = 0;
 424                 width = rbe->len;
 425         }
 426         wattron(bot.win, COLOR_PAIR(rbe->color));
 427         waddstr(bot.win, rbe->msg + bytes_to_skip);
 428         *lines = NUM_LINES(width);
 429         return fvr;
 430 }
 431
 432 static void redraw_bot_win(void)
 433 {
 434         unsigned lines;
 435         int i;
 436
 437         wmove(bot.win, 0, 0);
 438         wclear(bot.win);
 439         i = draw_top_rbe(&lines);
 440         if (i <= 0)
 441                 goto out;
 442         while (i > 0 && lines < bot.lines) {
 443                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 444                 if (!rbe) {
 445                         lines++;
 446                         waddstr(bot.win, "\n");
 447                         continue;
 448                 }
 449                 lines += NUM_LINES(rbe->len);
 450                 wattron(bot.win, COLOR_PAIR(rbe->color));
 451                 waddstr(bot.win, "\n");
 452                 waddstr(bot.win, rbe->msg);
 453         }
 454 out:
 455         wrefresh(bot.win);
 456 }
 457
 458 static void rb_add_entry(int color, char *msg)
 459 {
 460         struct rb_entry *old, *new;
 461         int x, y;
 462         size_t len;
 463
 464         if (strwidth(msg, &len) < 0)
 465                 return;
 466         new = para_malloc(sizeof(struct rb_entry));
 467         new->color = color;
 468         new->len = len;
 469         new->msg = msg;
 470         old = ringbuffer_add(bot_win_rb, new);
 471 //      fprintf(stderr, "added: %s\n", new->msg);
 472         if (old) {
 473                 free(old->msg);
 474                 free(old);
 475         }
 476         if (scroll_position) {
 477                 /* discard current scrolling, like xterm does */
 478                 scroll_position = 0;
 479                 redraw_bot_win();
 480                 return;
 481         }
 482         wattron(bot.win, COLOR_PAIR(color));
 483         getyx(bot.win, y, x);
 484         if (y || x)
 485                 waddstr(bot.win, "\n");
 486         waddstr(bot.win, msg);
 487 }
 488
 489 /*
 490  * print formated output to bot win and refresh
 491  */
 492 __printf_2_3 static void outputf(int color, const char* fmt,...)
 493 {
 494         char *msg;
 495         va_list ap;
 496
 497         if (!curses_active)
 498                 return;
 499         va_start(ap, fmt);
 500         xvasprintf(&msg, fmt, ap);
 501         va_end(ap);
 502         rb_add_entry(color, msg);
 503         wrefresh(bot.win);
 504 }
 505
 506 static int add_output_line(char *line, void *data)
 507 {
 508         int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 509
 510         if (!curses_active)
 511                 return 1;
 512         rb_add_entry(color, para_strdup(line));
 513         return 1;
 514 }
 515
 516 static int loglevel;
 517
 518 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 519 {
 520         int color;
 521         char *msg;
 522         va_list ap;
 523
 524         if (ll < loglevel || !curses_active)
 525                 return;
 526         switch (ll) {
 527                 case LL_DEBUG:
 528                 case LL_INFO:
 529                 case LL_NOTICE:
 530                         color = COLOR_MSG;
 531                         break;
 532                 default:
 533                         color = COLOR_ERRMSG;
 534         }
 535         va_start(ap, fmt);
 536         xvasprintf(&msg, fmt, ap);
 537         va_end(ap);
 538         chop(msg);
 539         rb_add_entry(color, msg);
 540         wrefresh(bot.win);
 541 }
 542 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 543
 544 static void setup_signal_handling(void)
 545 {
 546         signal_pipe = para_signal_init();
 547         para_install_sighandler(SIGINT);
 548         para_install_sighandler(SIGTERM);
 549         para_install_sighandler(SIGCHLD);
 550         para_install_sighandler(SIGWINCH);
 551         para_install_sighandler(SIGUSR1);
 552 }
 553
 554 /* kill every process in the process group and exit */
 555 __noreturn static void kill_pg_and_die(int ret)
 556 {
 557         para_sigaction(SIGTERM, SIG_IGN);
 558         kill(0, SIGTERM);
 559         exit(ret);
 560 }
 561
 562 static void shutdown_curses(void)
 563 {
 564         if (!curses_active)
 565                 return;
 566         def_prog_mode();
 567         curses_active = 0;
 568         endwin();
 569 }
 570
 571 __noreturn static void finish(int ret)
 572 {
 573         shutdown_curses();
 574         kill_pg_and_die(ret);
 575 }
 576
 577 /*
 578  * exit curses and print given message to stdout/stderr
 579  */
 580 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 581 {
 582         va_list argp;
 583         FILE *outfd = ret? stderr: stdout;
 584
 585         shutdown_curses();
 586         va_start(argp, fmt);
 587         vfprintf(outfd, fmt, argp);
 588         va_end(argp);
 589         kill_pg_and_die(ret);
 590 }
 591
 592 static void print_welcome(void)
 593 {
 594         if (loglevel > LL_NOTICE)
 595                 return;
 596         outputf(COLOR_WELCOME, "Welcome to %s. Theme: %s",
 597                 version_single_line("gui"), theme.name);
 598         wclrtoeol(bot.win);
 599 }
 600
 601 /*
 602  * init all windows
 603  */
 604 static void init_wins(int top_lines)
 605 {
 606         int i;
 607
 608         top.lines = top_lines;
 609         top.cols = COLS;
 610         top.begy = 0;
 611         top.begx = 0;
 612
 613         bot.lines = LINES - top.lines - 3;
 614         bot.cols = COLS;
 615         bot.begy = top.lines + 1;
 616         bot.begx = 0;
 617
 618         sb.lines = 1;
 619         sb.cols = COLS;
 620         sb.begy = LINES - 2;
 621         sb.begx = 0;
 622
 623         in.lines = 1;
 624         in.cols = COLS;
 625         in.begy = LINES - 1;
 626         in.begx = 0;
 627
 628         sep.lines = 1;
 629         sep.cols = COLS;
 630         sep.begy = top.lines;
 631         sep.begx = 0;
 632
 633         assume_default_colors(theme.default_fg, theme.default_bg);
 634         if (top.win) {
 635                 mvwin(top.win, top.begy, top.begx);
 636                 wresize(top.win, top.lines, top.cols);
 637
 638                 mvwin(sb.win, sb.begy, sb.begx);
 639                 wresize(sb.win, sb.lines, sb.cols);
 640
 641                 mvwin(sep.win, sep.begy, sep.begx);
 642                 wresize(sep.win, sep.lines, sep.cols);
 643
 644                 mvwin(bot.win, bot.begy, bot.begx);
 645                 wresize(bot.win, bot.lines, bot.cols);
 646
 647                 mvwin(in.win, in.begy, in.begx);
 648                 wresize(in.win, in.lines, in.cols);
 649         } else {
 650                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 651                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 652                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 653                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 654                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 655                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 656                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 657                 wclear(bot.win);
 658                 wclear(sb.win);
 659                 wclear(in.win);
 660                 scrollok(bot.win, 1);
 661                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 662                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 663                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 664                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 665                 nodelay(top.win, 1);
 666                 nodelay(bot.win, 1);
 667                 nodelay(sb.win, 1);
 668                 nodelay(in.win, 0);
 669
 670                 keypad(top.win, 1);
 671                 keypad(bot.win, 1);
 672                 keypad(sb.win, 1);
 673                 keypad(in.win, 1);
 674                 print_status_bar();
 675         }
 676         wmove(sep.win, 0, 0);
 677         for (i = 1; i <= COLS; i++)
 678                 waddstr(sep.win, theme.sep_str);
 679         wclear(top.win);
 680         //wclear(bot.win);
 681         wnoutrefresh(top.win);
 682         wnoutrefresh(bot.win);
 683         //wnoutrefresh(sb.win);
 684         print_status_bar();
 685         wnoutrefresh(in.win);
 686         wnoutrefresh(sep.win);
 687         doupdate();
 688 }
 689
 690 /*
 691  * Print stat item #i to curses window
 692  */
 693 static void print_stat_item(int i)
 694 {
 695         char *tmp;
 696         struct stat_item_data d = theme.data[i];
 697         char *c = stat_content[i];
 698
 699         if (!curses_active || !d.len || !c)
 700                 return;
 701         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 702         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 703         wrefresh(top.win);
 704         wattron(top.win, COLOR_PAIR(i + 1));
 705         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 706         free(tmp);
 707         wrefresh(top.win);
 708 }
 709
 710 static int update_item(int item_num, char *buf)
 711 {
 712         char **c = stat_content + item_num;
 713
 714         free(*c);
 715         if (buf && buf[0])
 716                 goto dup;
 717         switch (item_num) {
 718         case SI_ARTIST:
 719                 *c = para_strdup("(artist tag not set)");
 720                 goto print;
 721         case SI_TITLE:
 722                 *c = para_strdup("(title tag not set)");
 723                 goto print;
 724         case SI_YEAR:
 725                 *c = para_strdup("????");
 726                 goto print;
 727         case SI_ALBUM:
 728                 *c = para_strdup("(album tag not set)");
 729                 goto print;
 730         case SI_COMMENT:
 731                 *c = para_strdup("(comment tag not set)");
 732                 goto print;
 733         }
 734 dup:
 735         *c = para_strdup(buf);
 736 print:
 737         print_stat_item(item_num);
 738         return 1;
 739 }
 740
 741 static int read_stat_pipe(fd_set *rfds)
 742 {
 743         static char *buf;
 744         static int bufsize, loaded;
 745         int ret, ret2;
 746         size_t sz;
 747
 748         if (stat_pipe < 0)
 749                 return 0;
 750         if (loaded >= bufsize) {
 751                 if (bufsize > 1000 * 1000) {
 752                         loaded = 0;
 753                         return 0;
 754                 }
 755                 bufsize += bufsize + 1000;
 756                 buf = para_realloc(buf, bufsize);
 757         }
 758         assert(loaded < bufsize);
 759         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 760                 rfds, &sz);
 761         loaded += sz;
 762         ret2 = for_each_stat_item(buf, loaded, update_item);
 763         if (ret < 0 || ret2 < 0) {
 764                 loaded = 0;
 765                 return ret2 < 0? ret2 : ret;
 766         }
 767         sz = ret2; /* what is left */
 768         if (sz > 0 && sz < loaded)
 769                 memmove(buf, buf + loaded - sz, sz);
 770         loaded = sz;
 771         return 1;
 772 }
 773
 774 static void print_all_items(void)
 775 {
 776         int i;
 777
 778         if (!curses_active)
 779                 return;
 780         FOR_EACH_STATUS_ITEM(i)
 781                 print_stat_item(i);
 782 }
 783
 784 static void clear_all_items(void)
 785 {
 786         int i;
 787
 788         FOR_EACH_STATUS_ITEM(i) {
 789                 free(stat_content[i]);
 790                 stat_content[i] = para_strdup("");
 791         }
 792 }
 793
 794 static void init_pair_or_die(short pair, short f, short b)
 795 {
 796         if (init_pair(pair, f, b) == ERR)
 797                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 798 }
 799
 800 static void init_colors_or_die(void)
 801 {
 802         int i;
 803
 804         if (!has_colors())
 805                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 806         if (start_color() == ERR)
 807                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 808         FOR_EACH_STATUS_ITEM(i)
 809                 if (theme.data[i].len)
 810                         init_pair_or_die(i + 1, theme.data[i].fg,
 811                                 theme.data[i].bg);
 812         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 813         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 814         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 815         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 816         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 817         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 818         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 819         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 820         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 821 }
 822
 823 /* (Re-)initialize the curses library. */
 824 static void init_curses(void)
 825 {
 826         curses_active = 1;
 827         if (top.win && refresh() == ERR) /* refresh is really needed */
 828                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 829         if (LINES < theme.lines_min || COLS < theme.cols_min)
 830                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 831                         " (need at least %dx%d)\n", COLS, LINES,
 832                         theme.cols_min, theme.lines_min);
 833         curs_set(0); /* make cursor invisible, ignore errors */
 834         nonl(); /* do not NL->CR/NL on output, always returns OK */
 835         /* don't echo input */
 836         if (noecho() == ERR)
 837                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 838         /* take input chars one at a time, no wait for \n */
 839         if (cbreak() == ERR)
 840                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 841         init_colors_or_die();
 842         clear(); /* ignore non-fatal errors */
 843         init_wins(theme.top_lines_default);
 844         print_all_items();
 845         // noecho(); /* don't echo input */
 846 }
 847
 848 static void check_sigchld(void)
 849 {
 850         int ret;
 851         pid_t pid;
 852
 853 reap_next_child:
 854         ret = para_reap_child(&pid);
 855         if (ret <= 0)
 856                 return;
 857         if (pid == cmd_pid)
 858                 cmd_pid = 0;
 859         goto reap_next_child;
 860 }
 861
 862 /*
 863  * This sucker modifies its first argument. *handler and *arg are
 864  * pointers to 0-terminated strings (inside line). Crap.
 865  */
 866 static int split_key_map(char *line, char **handler, char **arg)
 867 {
 868         if (!(*handler = strchr(line + 1, ':')))
 869                 goto err_out;
 870         **handler = '\0';
 871         (*handler)++;
 872         if (!(*arg = strchr(*handler, ':')))
 873                 goto err_out;
 874         **arg = '\0';
 875         (*arg)++;
 876         return 1;
 877 err_out:
 878         return 0;
 879 }
 880
 881 static int check_key_map_args(void)
 882 {
 883         char *s;
 884         int i, ret = -1;
 885         char *tmp = NULL, *handler, *arg;
 886
 887         for (i = 0; i < conf.key_map_given; ++i) {
 888                 s = conf.key_map_arg[i];
 889                 if (!(*s))
 890                         goto err_out;
 891                 free(tmp);
 892                 tmp = para_strdup(s);
 893                 if (!split_key_map(tmp, &handler, &arg))
 894                         goto err_out;
 895                 if (strlen(handler) != 1)
 896                         goto err_out;
 897                 if (*handler != 'x'
 898                         && *handler != 'd'
 899                         && *handler != 'i'
 900                         && *handler != 'p')
 901                         goto err_out;
 902                 if (*handler != 'i')
 903                         continue;
 904                 if (find_cmd_byname(arg) < 0)
 905                         goto err_out;
 906         }
 907         ret = 0;
 908 err_out:
 909         free(tmp);
 910         return ret;
 911 }
 912
 913 /*
 914  * React to various signal-related events
 915  */
 916 static void handle_signal(int sig)
 917 {
 918         switch (sig) {
 919         case SIGTERM:
 920                 msg_n_exit(EXIT_FAILURE,
 921                         "only the good die young (caught SIGTERM))\n");
 922                 return;
 923         case SIGWINCH:
 924                 if (curses_active) {
 925                         shutdown_curses();
 926                         init_curses();
 927                         redraw_bot_win();
 928                 }
 929                 return;
 930         case SIGINT:
 931                 PARA_WARNING_LOG("caught SIGINT, reset\n");
 932                 /* Nothing to do. SIGINT killed our child which gets noticed
 933                  * by do_select and resets everything.
 934                  */
 935                 return;
 936         case SIGUSR1:
 937                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
 938                 com_reread_conf();
 939                 return;
 940         case SIGCHLD:
 941                 check_sigchld();
 942                 return;
 943         }
 944 }
 945
 946 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 947 {
 948         static struct timeval next_exec, atm, diff;
 949         int ret, fds[3] = {0, 1, 0};
 950         pid_t pid;
 951
 952         if (stat_pipe >= 0)
 953                 goto success;
 954         /* Avoid busy loop */
 955         gettimeofday(&atm, NULL);
 956         if (tv_diff(&next_exec, &atm, &diff) > 0) {
 957                 if (tv_diff(&diff, tv, NULL) < 0)
 958                         *tv = diff;
 959                 return;
 960         }
 961         next_exec.tv_sec = atm.tv_sec + 2;
 962         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 963         if (ret < 0)
 964                 return;
 965         ret = mark_fd_nonblocking(fds[1]);
 966         if (ret < 0) {
 967                 close(fds[1]);
 968                 return;
 969         }
 970         stat_pipe = fds[1];
 971 success:
 972         para_fd_set(stat_pipe, rfds, max_fileno);
 973 }
 974
 975 #define COMMAND_BUF_SIZE 32768
 976
 977 /*
 978  * This is the core select loop. Besides the (internal) signal
 979  * pipe, the following other fds are checked according to the mode:
 980  *
 981  * GETCH_MODE: check stdin, return when key is pressed
 982  *
 983  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 984  * stdout and stderr or when any key is pressed.
 985  *
 986  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 987  * is running. During that time curses is disabled.  Returns when
 988  * cmd_pid == 0.
 989  */
 990 static int do_select(int mode)
 991 {
 992         fd_set rfds;
 993         int ret, i, max_fileno;
 994         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
 995         int cbo[2] = {0, 0}; /* command buf offsets */
 996         struct timeval tv;
 997         unsigned flags[2] = {0, 0}; /* for for_each_line() */
 998
 999 repeat:
1000         tv.tv_sec = conf.timeout_arg  / 1000;
1001         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
1002 //      ret = refresh_status();
1003         FD_ZERO(&rfds);
1004         max_fileno = 0;
1005         status_pre_select(&rfds, &max_fileno, &tv);
1006         /* signal pipe */
1007         para_fd_set(signal_pipe, &rfds, &max_fileno);
1008         /* command pipe only for COMMAND_MODE */
1009         if (mode == COMMAND_MODE) {
1010                 if (command_fds[0] >= 0)
1011                         para_fd_set(command_fds[0], &rfds, &max_fileno);
1012                 if (command_fds[1] >= 0)
1013                         para_fd_set(command_fds[1], &rfds, &max_fileno);
1014         }
1015         if (mode == GETCH_MODE || mode == COMMAND_MODE)
1016                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1017         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1018         if (ret <= 0)
1019                 goto check_return; /* skip fd checks */
1020         /* signals */
1021         ret = para_next_signal(&rfds);
1022         if (ret > 0)
1023                 handle_signal(ret);
1024         /* read command pipe if ready */
1025         if (mode == COMMAND_MODE) {
1026                 for (i = 0; i < 2; i++) {
1027                         size_t sz;
1028                         if (command_fds[i] < 0)
1029                                 continue;
1030                         ret = read_nonblock(command_fds[i],
1031                                 command_buf[i] + cbo[i],
1032                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1033                         cbo[i] += sz;
1034                         sz = cbo[i];
1035                         cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1036                                 add_output_line, &i);
1037                         if (sz != cbo[i]) { /* at least one line found */
1038                                 wrefresh(bot.win);
1039                                 flags[i] = 0;
1040                         }
1041                         if (ret < 0) {
1042                                 PARA_NOTICE_LOG("closing command fd %d: %s\n",
1043                                         i, para_strerror(-ret));
1044                                 close(command_fds[i]);
1045                                 command_fds[i] = -1;
1046                                 flags[i] = 0;
1047                                 cbo[i] = 0;
1048                                 if (command_fds[!i] < 0) /* both fds closed */
1049                                         return 0;
1050                         }
1051                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1052                                 PARA_NOTICE_LOG("discarding overlong line\n");
1053                                 cbo[i] = 0;
1054                                 flags[i] = FELF_DISCARD_FIRST;
1055                         }
1056                 }
1057         }
1058         ret = read_stat_pipe(&rfds);
1059         if (ret < 0) {
1060                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1061                 close(stat_pipe);
1062                 stat_pipe = -1;
1063                 clear_all_items();
1064                 free(stat_content[SI_BASENAME]);
1065                 stat_content[SI_BASENAME] =
1066                         para_strdup("stat command terminated!?");
1067                 print_all_items();
1068         }
1069 check_return:
1070         switch (mode) {
1071         case COMMAND_MODE:
1072                 ret = wgetch(top.win);
1073                 if (ret != ERR && ret != KEY_RESIZE) {
1074                         if (command_fds[0] >= 0) {
1075                                 close(command_fds[0]);
1076                                 command_fds[0] = -1;
1077                         }
1078                         if (command_fds[1] >= 0) {
1079                                 close(command_fds[1]);
1080                                 command_fds[1] = -1;
1081                         }
1082                         if (cmd_pid)
1083                                 kill(cmd_pid, SIGTERM);
1084                         return -1;
1085                 }
1086                 break;
1087         case GETCH_MODE:
1088                 ret = wgetch(top.win);
1089                 if (ret != ERR && ret != KEY_RESIZE)
1090                         return ret;
1091                 break;
1092         case EXTERNAL_MODE:
1093                 if (cmd_pid == 0)
1094                         return 0;
1095         }
1096         goto repeat;
1097 }
1098
1099 /*
1100  * read from command pipe and print data to bot window
1101  */
1102 static void send_output(void)
1103 {
1104         int ret;
1105
1106         ret = mark_fd_nonblocking(command_fds[0]);
1107         if (ret < 0)
1108                 goto fail;
1109         ret = mark_fd_nonblocking(command_fds[1]);
1110         if (ret < 0)
1111                 goto fail;
1112         if (do_select(COMMAND_MODE) >= 0)
1113                 PARA_INFO_LOG("command complete\n");
1114         else
1115                 PARA_NOTICE_LOG("command aborted\n");
1116         print_in_bar(COLOR_MSG, " ");
1117         return;
1118 fail:
1119         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1120         close(command_fds[0]);
1121         close(command_fds[1]);
1122 }
1123
1124 static void para_cmd(char *cmd)
1125 {
1126         int ret, fds[3] = {0, 1, 1};
1127         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1128
1129         outputf(COLOR_COMMAND, "%s", c);
1130         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1131         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1132         free(c);
1133         if (ret < 0)
1134                 return;
1135         command_fds[0] = fds[1];
1136         command_fds[1] = fds[2];
1137         send_output();
1138 }
1139
1140 /*
1141  * exec command and print output to bot win
1142  */
1143 static void display_cmd(char *cmd)
1144 {
1145         int fds[3] = {0, 1, 1};
1146
1147         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1148         outputf(COLOR_COMMAND, "%s", cmd);
1149         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1150                 return;
1151         command_fds[0] = fds[1];
1152         command_fds[1] = fds[2];
1153         send_output();
1154 }
1155
1156 /*
1157  * shutdown curses and stat pipe before executing external commands
1158  */
1159 static void external_cmd(char *cmd)
1160 {
1161         int fds[3] = {-1, -1, -1};
1162
1163         if (cmd_pid)
1164                 return;
1165         shutdown_curses();
1166         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1167                 return;
1168         do_select(EXTERNAL_MODE);
1169         init_curses();
1170 }
1171
1172 static void print_scroll_msg(void)
1173 {
1174         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1175         int first_rbe = first_visible_rbe(&lines_total);
1176
1177         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1178                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1179 }
1180
1181 static void com_scroll_top(void)
1182 {
1183         int i = RINGBUFFER_SIZE - 1;
1184         unsigned lines = 0;
1185
1186         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1187                 i--;
1188         /* i is oldest entry */
1189         for (; lines < bot.lines && i >= 0; i--) {
1190                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1191                 if (!rbe)
1192                         break;
1193                 lines += NUM_LINES(rbe->len);
1194         }
1195         i++;
1196         if (lines > 0 && scroll_position != i) {
1197                 scroll_position = i;
1198                 redraw_bot_win();
1199                 print_scroll_msg();
1200                 return;
1201         }
1202         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1203 }
1204
1205 static void com_cancel_scrolling(void)
1206 {
1207
1208         if (scroll_position == 0) {
1209                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1210                 return;
1211         }
1212         scroll_position = 0;
1213         redraw_bot_win();
1214 }
1215
1216 static void com_page_down(void)
1217 {
1218         unsigned lines = 0;
1219         int i = scroll_position;
1220
1221         while (lines < bot.lines && --i > 0) {
1222                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1223                 if (!rbe)
1224                         break;
1225                 lines += NUM_LINES(rbe->len);
1226         }
1227         if (lines) {
1228                 scroll_position = i;
1229                 redraw_bot_win();
1230                 print_scroll_msg();
1231                 return;
1232         }
1233         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1234 }
1235
1236 static void com_page_up(void)
1237 {
1238         unsigned lines;
1239         int fvr = first_visible_rbe(&lines);
1240
1241         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1242                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1243                 return;
1244         }
1245         scroll_position = fvr + 1;
1246         for (; scroll_position > 0; scroll_position--) {
1247                 first_visible_rbe(&lines);
1248                 if (lines == bot.lines)
1249                         break;
1250         }
1251         redraw_bot_win();
1252         print_scroll_msg();
1253 }
1254
1255 static void com_scroll_down(void)
1256 {
1257         struct rb_entry *rbe;
1258         int rbe_lines;
1259
1260         if (!scroll_position) {
1261                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1262                 return;
1263         }
1264         scroll_position--;
1265         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1266         rbe_lines = NUM_LINES(rbe->len);
1267         wscrl(bot.win, rbe_lines);
1268         wmove(bot.win, bot.lines - rbe_lines, 0);
1269         wattron(bot.win, COLOR_PAIR(rbe->color));
1270         waddstr(bot.win, rbe->msg);
1271         wrefresh(bot.win);
1272         print_scroll_msg();
1273 }
1274
1275 static void com_scroll_up(void)
1276 {
1277         struct rb_entry *rbe = NULL;
1278         unsigned lines;
1279         int i, first_rbe, num_scroll;
1280
1281         /* the entry that is going to vanish */
1282         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1283         if (!rbe)
1284                 goto err_out;
1285         num_scroll = NUM_LINES(rbe->len);
1286         first_rbe = first_visible_rbe(&lines);
1287         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1288                 goto err_out;
1289         scroll_position++;
1290         wscrl(bot.win, -num_scroll);
1291         i = draw_top_rbe(&lines);
1292         if (i < 0)
1293                 goto err_out;
1294         while (i > 0 && lines < num_scroll) {
1295                 int rbe_lines;
1296                 rbe = ringbuffer_get(bot_win_rb, --i);
1297                 if (!rbe)
1298                         break;
1299                 rbe_lines = NUM_LINES(rbe->len);
1300                 lines += rbe_lines;
1301 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1302                 wattron(bot.win, COLOR_PAIR(rbe->color));
1303                 waddstr(bot.win, "\n");
1304                 waddstr(bot.win, rbe->msg);
1305                 if (!i)
1306                         break;
1307                 i--;
1308         }
1309         wrefresh(bot.win);
1310         print_scroll_msg();
1311         return;
1312 err_out:
1313         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1314 }
1315
1316 static void com_ll_decr(void)
1317 {
1318         if (loglevel <= LL_DEBUG) {
1319                 print_in_bar(COLOR_ERRMSG,
1320                         "loglevel already at maximal verbosity\n");
1321                 return;
1322         }
1323         loglevel--;
1324         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1325 }
1326
1327 static void com_ll_incr(void)
1328 {
1329         if (loglevel >= LL_EMERG) {
1330                 print_in_bar(COLOR_ERRMSG,
1331                         "loglevel already at minimal verbosity\n");
1332                 return;
1333         }
1334         loglevel++;
1335         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1336 }
1337
1338 /*
1339  * reread configuration, terminate on errors
1340  */
1341 static void com_reread_conf(void)
1342 {
1343         char *cf = configfile_exists();
1344         struct gui_cmdline_parser_params params = {
1345                 .override = 1,
1346                 .initialize = 1,
1347                 .check_required = 0,
1348                 .check_ambiguity = 0,
1349                 .print_errors = 0,
1350         };
1351
1352         if (!cf) {
1353                 PARA_WARNING_LOG("there is no configuration to read\n");
1354                 return;
1355         }
1356         PARA_INFO_LOG("rereading command line options and config file\n");
1357         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1358         /*
1359          * Despite .print_errors is set to 0, gengetopt will print to stderr
1360          * anyway, and exit on errors. So we have to shutdown curses first.
1361          */
1362         shutdown_curses();
1363         gui_cmdline_parser_config_file(cf, &conf, &params);
1364         init_curses();
1365         PARA_NOTICE_LOG("config file reloaded\n");
1366         if (check_key_map_args() < 0)
1367                 finish(EXIT_FAILURE);
1368 }
1369
1370 static void com_help(void)
1371 {
1372         int i;
1373
1374         for (i = 0; i < conf.key_map_given; ++i) {
1375                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1376                 const char *handler_text = "???", *desc = NULL;
1377
1378                 if (!split_key_map(tmp, &handler, &arg)) {
1379                         free(tmp);
1380                         return;
1381                 }
1382                 switch (*handler) {
1383                         case 'i':
1384                                 handler_text = "internal";
1385                                 desc = command_list[find_cmd_byname(arg)].description;
1386                                 break;
1387                         case 'x': handler_text = "external"; break;
1388                         case 'd': handler_text = "display "; break;
1389                         case 'p': handler_text = "para    "; break;
1390                 }
1391                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1392                         strlen(arg) < 8? "\t" : "",
1393                         desc? desc : "");
1394                 free(tmp);
1395         }
1396         for (i = 0; command_list[i].handler; i++) {
1397                 struct gui_command gc = command_list[i];
1398
1399                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1400                         strlen(gc.name) < 8? "\t" : "",
1401                         gc.description);
1402         }
1403         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1404                 "for more info");
1405 }
1406
1407 static void com_shrink_top_win(void)
1408 {
1409         if (top.lines <= theme.top_lines_min) {
1410                 PARA_WARNING_LOG("can not decrease top window\n");
1411                 return;
1412         }
1413         init_wins(top.lines - 1);
1414         wclear(top.win);
1415         print_all_items();
1416         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1417 }
1418
1419 static void com_enlarge_top_win(void)
1420 {
1421         if (bot.lines < 3) {
1422                 PARA_WARNING_LOG("can not increase top window\n");
1423                 return;
1424         }
1425         init_wins(top.lines + 1);
1426         wclear(top.win);
1427         print_all_items();
1428         print_in_bar(COLOR_MSG, "increased top window");
1429 }
1430
1431 static void com_version(void)
1432 {
1433         print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1434 }
1435
1436 __noreturn static void com_quit(void)
1437 {
1438         finish(0);
1439 }
1440
1441 static void com_refresh(void)
1442 {
1443         shutdown_curses();
1444         init_curses();
1445 }
1446
1447 static void change_theme(int next)
1448 {
1449         if (next)
1450                 next_theme(&theme);
1451         else
1452                 prev_theme(&theme);
1453         /* This seems to be needed twice, why? */
1454         com_refresh();
1455         com_refresh();
1456         PARA_NOTICE_LOG("new theme: %s\n", theme.name);
1457 }
1458
1459 static void com_next_theme(void)
1460 {
1461         change_theme(1);
1462 }
1463
1464 static void com_prev_theme(void)
1465 {
1466         change_theme(0);
1467 }
1468
1469
1470 static void handle_command(int c)
1471 {
1472         int i;
1473
1474         /* first check user-defined key bindings */
1475         for (i = 0; i < conf.key_map_given; ++i) {
1476                 char *tmp, *handler, *arg;
1477
1478                 tmp = para_strdup(conf.key_map_arg[i]);
1479                 if (!split_key_map(tmp, &handler, &arg)) {
1480                         free(tmp);
1481                         return;
1482                 }
1483                 if (strcmp(tmp, km_keyname(c))) {
1484                         free(tmp);
1485                         continue;
1486                 }
1487                 if (*handler == 'd')
1488                         display_cmd(arg);
1489                 else if (*handler == 'x')
1490                         external_cmd(arg);
1491                 else if (*handler == 'p')
1492                         para_cmd(arg);
1493                 else if (*handler == 'i') {
1494                         int num = find_cmd_byname(arg);
1495                         if (num >= 0)
1496                                 command_list[num].handler();
1497                 }
1498                 free(tmp);
1499                 return;
1500         }
1501         /* not found, check internal key bindings */
1502         for (i = 0; command_list[i].handler; i++) {
1503                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1504                         command_list[i].handler();
1505                         return;
1506                 }
1507         }
1508         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1509                 km_keyname(c));
1510 }
1511
1512 __noreturn static void print_help_and_die(void)
1513 {
1514         struct ggo_help h = DEFINE_GGO_HELP(gui);
1515         bool d = conf.detailed_help_given;
1516
1517         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1518         exit(0);
1519 }
1520
1521 int main(int argc, char *argv[])
1522 {
1523         int ret;
1524         char *cf;
1525
1526         _argc = argc;
1527         _argv = argv;
1528
1529         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1530         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1531         version_handle_flag("gui", conf.version_given);
1532         if (conf.help_given || conf.detailed_help_given)
1533                 print_help_and_die();
1534         cf = configfile_exists();
1535         if (!cf && conf.config_file_given) {
1536                 fprintf(stderr, "can not read config file %s\n",
1537                         conf.config_file_arg);
1538                 exit(EXIT_FAILURE);
1539         }
1540         if (cf) {
1541                 struct gui_cmdline_parser_params params = {
1542                         .override = 0,
1543                         .initialize = 0,
1544                         .check_required = 0,
1545                         .check_ambiguity = 0,
1546                         .print_errors = 1,
1547                 };
1548                 gui_cmdline_parser_config_file(cf, &conf, &params);
1549                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1550         }
1551         if (check_key_map_args() < 0) {
1552                 fprintf(stderr, "invalid key map\n");
1553                 exit(EXIT_FAILURE);
1554         }
1555         init_theme_or_die(conf.theme_arg, &theme);
1556         top.lines = theme.top_lines_default;
1557         setup_signal_handling();
1558         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1559         setlocale(LC_CTYPE, "");
1560         initscr(); /* needed only once, always successful */
1561         init_curses();
1562         print_welcome();
1563         for (;;) {
1564                 print_status_bar();
1565                 ret = do_select(GETCH_MODE);
1566                 if (!ret)
1567                         continue;
1568                 print_in_bar(COLOR_MSG, " ");
1569                 handle_command(ret);
1570         }
1571 }