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];
  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 struct stat_item {
  84         char name[MAXLINE];
  85         char prefix[MAXLINE];
  86         char postfix[MAXLINE];
  87         unsigned y;
  88         unsigned x;
  89         unsigned len;
  90         int fg, bg;
  91         int align;
  92         char content[MAXLINE];
  93 };
  94
  95 static struct gui_theme theme;
  96
  97 static int _argc;
  98 static char **_argv;
  99
 100 static void com_help(void);
 101 static void com_reread_conf(void);
 102 static void com_enlarge_top_win(void);
 103 static void com_shrink_top_win(void);
 104 static void com_version(void);
 105 __noreturn static void com_quit(void);
 106 static void com_refresh(void);
 107 static void com_ll_incr(void);
 108 static void com_ll_decr(void);
 109 static void com_prev_theme(void);
 110 static void com_next_theme(void);
 111 static void com_scroll_up(void);
 112 static void com_scroll_down(void);
 113 static void com_page_up(void);
 114 static void com_page_down(void);
 115 static void com_cancel_scrolling(void);
 116 static void com_scroll_top(void);
 117
 118 static struct gui_command command_list[] = {
 119         {
 120                 .key = "?",
 121                 .name = "help",
 122                 .description = "print help",
 123                 .handler = com_help
 124         }, {
 125                 .key = "+",
 126                 .name = "enlarge_win",
 127                 .description = "enlarge the top window",
 128                 .handler = com_enlarge_top_win
 129         }, {
 130                 .key = "-",
 131                 .name = "shrink_win",
 132                 .description = "shrink the top window",
 133                 .handler = com_shrink_top_win
 134         }, {
 135                 .key = "r",
 136                 .name = "reread_conf",
 137                 .description = "reread configuration file",
 138                 .handler = com_reread_conf
 139         }, {
 140                 .key = "q",
 141                 .name = "quit",
 142                 .description = "exit para_gui",
 143                 .handler = com_quit
 144         }, {
 145                 .key = "^L",
 146                 .name = "refresh",
 147                 .description = "redraw the screen",
 148                 .handler = com_refresh
 149         }, {
 150                 .key = ".",
 151                 .name = "next_theme",
 152                 .description = "switch to next theme",
 153                 .handler = com_next_theme
 154         }, {
 155                 .key = ",",
 156                 .name = "prev_theme",
 157                 .description = "switch to previous stream",
 158                 .handler = com_prev_theme
 159         }, {
 160                 .key = ">",
 161                 .name = "ll_incr",
 162                 .description = "increase loglevel (decreases verbosity)",
 163                 .handler = com_ll_incr
 164         }, {
 165                 .key = "<",
 166                 .name = "ll_decr",
 167                 .description = "decrease loglevel (increases verbosity)",
 168                 .handler = com_ll_decr
 169         }, {
 170                 .key = "V",
 171                 .name = "version",
 172                 .description = "show the para_gui version",
 173                 .handler = com_version
 174         }, {
 175                 .key = "<up>",
 176                 .name = "scroll_up",
 177                 .description = "scroll up one line",
 178                 .handler = com_scroll_up
 179         }, {
 180                 .key = "<down>",
 181                 .name = "scroll_down",
 182                 .description = "scroll down one line",
 183                 .handler = com_scroll_down
 184         }, {
 185                 .key = "<ppage>",
 186                 .name = "page_up",
 187                 .description = "scroll up one page",
 188                 .handler = com_page_up
 189         }, {
 190                 .key = "<npage>",
 191                 .name = "page_down",
 192                 .description = "scroll down one page",
 193                 .handler = com_page_down
 194         }, {
 195                 .key = "<home>",
 196                 .name = "scroll_top",
 197                 .description = "scroll to top of buffer",
 198                 .handler = com_scroll_top
 199         }, {
 200                 .key = "<end>",
 201                 .name = "cancel_scroll",
 202                 .description = "deactivate scroll mode",
 203                 .handler = com_cancel_scrolling
 204         }, {
 205                 .handler = NULL
 206         }
 207 };
 208
 209 static int find_cmd_byname(char *name)
 210 {
 211         int i;
 212
 213         for (i = 0; command_list[i].handler; i++)
 214                 if (!strcmp(command_list[i].name, name))
 215                         return i;
 216         return -1;
 217 }
 218
 219 /* taken from mutt */
 220 static char *km_keyname(int c)
 221 {
 222         static char buf[10];
 223
 224         if (c == KEY_UP) {
 225                 sprintf(buf, "<up>");
 226                 return buf;
 227         }
 228         if (c == KEY_DOWN) {
 229                 sprintf(buf, "<down>");
 230                 return buf;
 231         }
 232         if (c == KEY_LEFT) {
 233                 sprintf(buf, "<left>");
 234                 return buf;
 235         }
 236         if (c == KEY_RIGHT) {
 237                 sprintf(buf, "<right>");
 238                 return buf;
 239         }
 240         if (c == KEY_NPAGE) {
 241                 sprintf(buf, "<npage>");
 242                 return buf;
 243         }
 244         if (c == KEY_PPAGE) {
 245                 sprintf(buf, "<ppage>");
 246                 return buf;
 247         }
 248         if (c == KEY_HOME) {
 249                 sprintf(buf, "<home>");
 250                 return buf;
 251         }
 252         if (c == KEY_END) {
 253                 sprintf(buf, "<end>");
 254                 return buf;
 255         }
 256         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 257                 if (c < 0)
 258                         c += 256;
 259                 if (c < 128) {
 260                         buf[0] = '^';
 261                         buf[1] = (c + '@') & 0x7f;
 262                         buf[2] = 0;
 263                 } else
 264                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 265                                 (c >> 3) & 7, c & 7);
 266         } else if (c >= KEY_F0 && c < KEY_F(256))
 267                 sprintf(buf, "<F%d>", c - KEY_F0);
 268         else if (isprint(c))
 269                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 270         else
 271                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 272         return buf;
 273 }
 274
 275 static char *configfile_exists(void)
 276 {
 277         static char *config_file;
 278         char *tmp;
 279
 280         if (!conf.config_file_given) {
 281                 if (!config_file) {
 282                         char *home = para_homedir();
 283                         config_file = make_message("%s/.paraslash/gui.conf",
 284                                 home);
 285                         free(home);
 286                 }
 287                 tmp = config_file;
 288         } else
 289                 tmp = conf.config_file_arg;
 290         return file_exists(tmp)? tmp: NULL;
 291 }
 292
 293 /* Print given number of spaces to curses window. */
 294 static void add_spaces(WINDOW* win, unsigned int num)
 295 {
 296         char space[] = "                                ";
 297         unsigned sz = sizeof(space) - 1; /* number of spaces */
 298
 299         while (num >= sz)  {
 300                 waddstr(win, space);
 301                 num -= sz;
 302         }
 303         if (num > 0) {
 304                 assert(num < sz);
 305                 space[num] = '\0';
 306                 waddstr(win, space);
 307         }
 308 }
 309
 310 /*
 311  * print aligned string to curses window. This function always prints
 312  * exactly len chars.
 313  */
 314 static int align_str(WINDOW* win, char *str, unsigned int len,
 315                 unsigned int align)
 316 {
 317         int ret, i, num; /* of spaces */
 318         size_t width;
 319
 320         if (!win || !str)
 321                 return 0;
 322         ret = strwidth(str, &width);
 323         if (ret < 0) {
 324                 PARA_ERROR_LOG("%s\n", para_strerror(-ret));
 325                 width = 0;
 326                 str[0] = '\0';
 327         }
 328         num = len - width;
 329         if (num < 0) {
 330                 str[len] = '\0';
 331                 num = 0;
 332         }
 333         /* replace control characters by spaces */
 334         for (i = 0; i < len && str[i]; i++) {
 335                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 336                         str[i] = ' ';
 337         }
 338         if (align == LEFT) {
 339                 waddstr(win, str);
 340                 add_spaces(win, num);
 341         } else if (align == RIGHT) {
 342                 add_spaces(win, num);
 343                 waddstr(win, str);
 344         } else {
 345                 add_spaces(win, num / 2);
 346                 waddstr(win, str[0]? str: "");
 347                 add_spaces(win, num - num / 2);
 348         }
 349         return 1;
 350 }
 351
 352 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 353 {
 354         char *msg;
 355         va_list ap;
 356
 357         if (!curses_active)
 358                 return;
 359         wattron(in.win, COLOR_PAIR(color));
 360         va_start(ap, fmt);
 361         xvasprintf(&msg, fmt, ap);
 362         va_end(ap);
 363         wmove(in.win, 0, 0);
 364         align_str(in.win, msg, sb.cols, LEFT);
 365         free(msg);
 366         wrefresh(in.win);
 367 }
 368
 369 /*
 370  * update the status bar
 371  */
 372 static void print_status_bar(void)
 373 {
 374         char *tmp;
 375
 376         if (!curses_active)
 377                 return;
 378         tmp = para_strdup(STANDARD_STATUS_BAR);
 379         wmove(sb.win, 0, 0);
 380         align_str(sb.win, tmp, sb.cols, CENTER);
 381         free(tmp);
 382         wrefresh(sb.win);
 383 }
 384
 385 /*
 386  * get the number of the oldest rbe that is (partially) visible. On return,
 387  * lines contains the sum of the number of lines of all visable entries. If the
 388  * first one is only partially visible, lines is greater than bot.lines.
 389  */
 390 static int first_visible_rbe(unsigned *lines)
 391 {
 392         int i;
 393         *lines = 0;
 394         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 395                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 396                 int rbe_lines;
 397                 if (!rbe)
 398                         return i - 1;
 399 //              fprintf(stderr, "found: %s\n", rbe->msg);
 400                 rbe_lines = NUM_LINES(rbe->len);
 401                 if (rbe_lines > bot.lines)
 402                         return -1;
 403                 *lines += rbe_lines;
 404                 if (*lines >= bot.lines)
 405                         return i;
 406         }
 407         return RINGBUFFER_SIZE - 1;
 408 }
 409
 410 /*
 411 returns number of first visible rbe, *lines is the number of lines drawn.
 412  */
 413 static int draw_top_rbe(unsigned *lines)
 414 {
 415         int ret, fvr = first_visible_rbe(lines);
 416         struct rb_entry *rbe;
 417         size_t bytes_to_skip, cells_to_skip, width;
 418
 419         if (fvr < 0)
 420                 return -1;
 421         wmove(bot.win, 0, 0);
 422         rbe = ringbuffer_get(bot_win_rb, fvr);
 423         if (!rbe)
 424                 return -1;
 425         if (*lines > bot.lines) {
 426                 /* rbe is partially visible multi-line */
 427                 cells_to_skip = (*lines - bot.lines) * bot.cols;
 428                 ret = skip_cells(rbe->msg, cells_to_skip, &bytes_to_skip);
 429                 if (ret < 0)
 430                         return ret;
 431                 ret = strwidth(rbe->msg + bytes_to_skip, &width);
 432                 if (ret < 0)
 433                         return ret;
 434         } else {
 435                 bytes_to_skip = 0;
 436                 width = rbe->len;
 437         }
 438         wattron(bot.win, COLOR_PAIR(rbe->color));
 439         waddstr(bot.win, rbe->msg + bytes_to_skip);
 440         *lines = NUM_LINES(width);
 441         return fvr;
 442 }
 443
 444 static void redraw_bot_win(void)
 445 {
 446         unsigned lines;
 447         int i;
 448
 449         wmove(bot.win, 0, 0);
 450         wclear(bot.win);
 451         i = draw_top_rbe(&lines);
 452         if (i <= 0)
 453                 goto out;
 454         while (i > 0 && lines < bot.lines) {
 455                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 456                 if (!rbe) {
 457                         lines++;
 458                         waddstr(bot.win, "\n");
 459                         continue;
 460                 }
 461                 lines += NUM_LINES(rbe->len);
 462                 wattron(bot.win, COLOR_PAIR(rbe->color));
 463                 waddstr(bot.win, "\n");
 464                 waddstr(bot.win, rbe->msg);
 465         }
 466 out:
 467         wrefresh(bot.win);
 468 }
 469
 470 static void rb_add_entry(int color, char *msg)
 471 {
 472         struct rb_entry *old, *new;
 473         int x, y;
 474         size_t len;
 475
 476         if (strwidth(msg, &len) < 0)
 477                 return;
 478         new = para_malloc(sizeof(struct rb_entry));
 479         new->color = color;
 480         new->len = len;
 481         new->msg = msg;
 482         old = ringbuffer_add(bot_win_rb, new);
 483 //      fprintf(stderr, "added: %s\n", new->msg);
 484         if (old) {
 485                 free(old->msg);
 486                 free(old);
 487         }
 488         if (scroll_position) {
 489                 /* discard current scrolling, like xterm does */
 490                 scroll_position = 0;
 491                 redraw_bot_win();
 492                 return;
 493         }
 494         wattron(bot.win, COLOR_PAIR(color));
 495         getyx(bot.win, y, x);
 496         if (y || x)
 497                 waddstr(bot.win, "\n");
 498         waddstr(bot.win, msg);
 499 }
 500
 501 /*
 502  * print formated output to bot win and refresh
 503  */
 504 __printf_2_3 static void outputf(int color, const char* fmt,...)
 505 {
 506         char *msg;
 507         va_list ap;
 508
 509         if (!curses_active)
 510                 return;
 511         va_start(ap, fmt);
 512         xvasprintf(&msg, fmt, ap);
 513         va_end(ap);
 514         rb_add_entry(color, msg);
 515         wrefresh(bot.win);
 516 }
 517
 518 static int add_output_line(char *line, void *data)
 519 {
 520         int color = *(int *)data? COLOR_ERRMSG : COLOR_OUTPUT;
 521         if (!curses_active)
 522                 return 1;
 523         rb_add_entry(color, para_strdup(line));
 524         return 1;
 525 }
 526
 527 static int loglevel;
 528
 529 static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 530 {
 531         int color;
 532         char *msg;
 533         va_list ap;
 534
 535         if (ll < loglevel || !curses_active)
 536                 return;
 537         switch (ll) {
 538                 case LL_DEBUG:
 539                 case LL_INFO:
 540                 case LL_NOTICE:
 541                         color = COLOR_MSG;
 542                         break;
 543                 default:
 544                         color = COLOR_ERRMSG;
 545         }
 546         va_start(ap, fmt);
 547         xvasprintf(&msg, fmt, ap);
 548         va_end(ap);
 549         chop(msg);
 550         rb_add_entry(color, msg);
 551         wrefresh(bot.win);
 552 }
 553 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 554
 555 static void setup_signal_handling(void)
 556 {
 557         signal_pipe = para_signal_init();
 558         para_install_sighandler(SIGINT);
 559         para_install_sighandler(SIGTERM);
 560         para_install_sighandler(SIGCHLD);
 561         para_install_sighandler(SIGWINCH);
 562         para_install_sighandler(SIGUSR1);
 563 }
 564
 565 /* kill every process in the process group and exit */
 566 __noreturn static void kill_pg_and_die(int ret)
 567 {
 568         para_sigaction(SIGTERM, SIG_IGN);
 569         kill(0, SIGTERM);
 570         exit(ret);
 571 }
 572
 573 static void shutdown_curses(void)
 574 {
 575         if (!curses_active)
 576                 return;
 577         def_prog_mode();
 578         curses_active = 0;
 579         endwin();
 580 }
 581
 582 __noreturn static void finish(int ret)
 583 {
 584         shutdown_curses();
 585         kill_pg_and_die(ret);
 586 }
 587
 588 /*
 589  * exit curses and print given message to stdout/stderr
 590  */
 591 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 592 {
 593         va_list argp;
 594         FILE *outfd = ret? stderr: stdout;
 595
 596         shutdown_curses();
 597         va_start(argp, fmt);
 598         vfprintf(outfd, fmt, argp);
 599         va_end(argp);
 600         kill_pg_and_die(ret);
 601 }
 602
 603 static void print_welcome(void)
 604 {
 605         if (loglevel > LL_NOTICE)
 606                 return;
 607         outputf(COLOR_WELCOME, "Welcome to %s. Theme: %s",
 608                 version_single_line("gui"), theme.name);
 609         wclrtoeol(bot.win);
 610 }
 611
 612 /*
 613  * init all windows
 614  */
 615 static void init_wins(int top_lines)
 616 {
 617         int i;
 618
 619         top.lines = top_lines;
 620         top.cols = COLS;
 621         top.begy = 0;
 622         top.begx = 0;
 623
 624         bot.lines = LINES - top.lines - 3;
 625         bot.cols = COLS;
 626         bot.begy = top.lines + 1;
 627         bot.begx = 0;
 628
 629         sb.lines = 1;
 630         sb.cols = COLS;
 631         sb.begy = LINES - 2;
 632         sb.begx = 0;
 633
 634         in.lines = 1;
 635         in.cols = COLS;
 636         in.begy = LINES - 1;
 637         in.begx = 0;
 638
 639         sep.lines = 1;
 640         sep.cols = COLS;
 641         sep.begy = top.lines;
 642         sep.begx = 0;
 643
 644         assume_default_colors(theme.default_fg, theme.default_bg);
 645         if (top.win) {
 646                 mvwin(top.win, top.begy, top.begx);
 647                 wresize(top.win, top.lines, top.cols);
 648
 649                 mvwin(sb.win, sb.begy, sb.begx);
 650                 wresize(sb.win, sb.lines, sb.cols);
 651
 652                 mvwin(sep.win, sep.begy, sep.begx);
 653                 wresize(sep.win, sep.lines, sep.cols);
 654
 655                 mvwin(bot.win, bot.begy, bot.begx);
 656                 wresize(bot.win, bot.lines, bot.cols);
 657
 658                 mvwin(in.win, in.begy, in.begx);
 659                 wresize(in.win, in.lines, in.cols);
 660         } else {
 661                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 662                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 663                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 664                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 665                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 666                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 667                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 668                 wclear(bot.win);
 669                 wclear(sb.win);
 670                 wclear(in.win);
 671                 scrollok(bot.win, 1);
 672                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 673                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 674                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 675                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 676                 nodelay(top.win, 1);
 677                 nodelay(bot.win, 1);
 678                 nodelay(sb.win, 1);
 679                 nodelay(in.win, 0);
 680
 681                 keypad(top.win, 1);
 682                 keypad(bot.win, 1);
 683                 keypad(sb.win, 1);
 684                 keypad(in.win, 1);
 685                 print_status_bar();
 686         }
 687         wmove(sep.win, 0, 0);
 688         for (i = 1; i <= COLS; i++)
 689                 waddstr(sep.win, theme.sep_str);
 690         wclear(top.win);
 691         //wclear(bot.win);
 692         wnoutrefresh(top.win);
 693         wnoutrefresh(bot.win);
 694         //wnoutrefresh(sb.win);
 695         print_status_bar();
 696         wnoutrefresh(in.win);
 697         wnoutrefresh(sep.win);
 698         doupdate();
 699 }
 700
 701 /*
 702  * Print stat item #i to curses window
 703  */
 704 static void print_stat_item(int i)
 705 {
 706         char *tmp;
 707         struct stat_item_data d = theme.data[i];
 708         char *c = stat_content[i];
 709
 710         if (!curses_active || !d.len || !c)
 711                 return;
 712         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 713         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 714         wrefresh(top.win);
 715         wattron(top.win, COLOR_PAIR(i + 1));
 716         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 717         free(tmp);
 718         wrefresh(top.win);
 719 }
 720
 721 static int update_item(int item_num, char *buf)
 722 {
 723         char **c = stat_content + item_num;
 724
 725         free(*c);
 726         if (buf && buf[0])
 727                 goto dup;
 728         switch (item_num) {
 729         case SI_ARTIST:
 730                 *c = para_strdup("(artist tag not set)");
 731                 goto print;
 732         case SI_TITLE:
 733                 *c = para_strdup("(title tag not set)");
 734                 goto print;
 735         case SI_YEAR:
 736                 *c = para_strdup("????");
 737                 goto print;
 738         case SI_ALBUM:
 739                 *c = para_strdup("(album tag not set)");
 740                 goto print;
 741         case SI_COMMENT:
 742                 *c = para_strdup("(comment tag not set)");
 743                 goto print;
 744         }
 745 dup:
 746         *c = para_strdup(buf);
 747 print:
 748         print_stat_item(item_num);
 749         return 1;
 750 }
 751
 752 static int read_stat_pipe(fd_set *rfds)
 753 {
 754         static char *buf;
 755         static int bufsize, loaded;
 756         int ret, ret2;
 757         size_t sz;
 758
 759         if (stat_pipe < 0)
 760                 return 0;
 761         if (loaded >= bufsize) {
 762                 if (bufsize > 1000 * 1000) {
 763                         loaded = 0;
 764                         return 0;
 765                 }
 766                 bufsize += bufsize + 1000;
 767                 buf = para_realloc(buf, bufsize);
 768         }
 769         assert(loaded < bufsize);
 770         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 771                 rfds, &sz);
 772         loaded += sz;
 773         ret2 = for_each_stat_item(buf, loaded, update_item);
 774         if (ret < 0 || ret2 < 0) {
 775                 loaded = 0;
 776                 return ret2 < 0? ret2 : ret;
 777         }
 778         sz = ret2; /* what is left */
 779         if (sz > 0 && sz < loaded)
 780                 memmove(buf, buf + loaded - sz, sz);
 781         loaded = sz;
 782         return 1;
 783 }
 784
 785 static void print_all_items(void)
 786 {
 787         int i;
 788
 789         if (!curses_active)
 790                 return;
 791         FOR_EACH_STATUS_ITEM(i)
 792                 print_stat_item(i);
 793 }
 794
 795 static void clear_all_items(void)
 796 {
 797         int i;
 798
 799         FOR_EACH_STATUS_ITEM(i) {
 800                 free(stat_content[i]);
 801                 stat_content[i] = para_strdup("");
 802         }
 803 }
 804
 805 static void init_pair_or_die(short pair, short f, short b)
 806 {
 807         if (init_pair(pair, f, b) == ERR)
 808                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 809 }
 810
 811 static void init_colors_or_die(void)
 812 {
 813         int i;
 814
 815         if (!has_colors())
 816                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 817         if (start_color() == ERR)
 818                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 819         FOR_EACH_STATUS_ITEM(i)
 820                 if (theme.data[i].len)
 821                         init_pair_or_die(i + 1, theme.data[i].fg,
 822                                 theme.data[i].bg);
 823         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 824         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 825         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 826         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 827         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 828         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 829         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 830         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 831         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 832 }
 833
 834 /* (Re-)initialize the curses library. */
 835 static void init_curses(void)
 836 {
 837         curses_active = 1;
 838         if (top.win && refresh() == ERR) /* refesh is really needed */
 839                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 840         if (LINES < theme.lines_min || COLS < theme.cols_min)
 841                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 842                         " (need at least %dx%d)\n", COLS, LINES,
 843                         theme.cols_min, theme.lines_min);
 844         curs_set(0); /* make cursor invisible, ignore errors */
 845         nonl(); /* do not NL->CR/NL on output, always returns OK */
 846         /* don't echo input */
 847         if (noecho() == ERR)
 848                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 849         /* take input chars one at a time, no wait for \n */
 850         if (cbreak() == ERR)
 851                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 852         init_colors_or_die();
 853         clear(); /* ignore non-fatal errors */
 854         init_wins(theme.top_lines_default);
 855         print_all_items();
 856         // noecho(); /* don't echo input */
 857 }
 858
 859 static void check_sigchld(void)
 860 {
 861         int ret;
 862         pid_t pid;
 863 reap_next_child:
 864         ret = para_reap_child(&pid);
 865         if (ret <= 0)
 866                 return;
 867         if (pid == cmd_pid)
 868                 cmd_pid = 0;
 869         goto reap_next_child;
 870 }
 871
 872 /*
 873  * This sucker modifies its first argument. *handler and *arg are
 874  * pointers to 0-terminated strings (inside line). Crap.
 875  */
 876 static int split_key_map(char *line, char **handler, char **arg)
 877 {
 878         if (!(*handler = strchr(line + 1, ':')))
 879                 goto err_out;
 880         **handler = '\0';
 881         (*handler)++;
 882         if (!(*arg = strchr(*handler, ':')))
 883                 goto err_out;
 884         **arg = '\0';
 885         (*arg)++;
 886         return 1;
 887 err_out:
 888         return 0;
 889 }
 890
 891 static int check_key_map_args(void)
 892 {
 893         char *s;
 894         int i, ret = -1;
 895         char *tmp = NULL, *handler, *arg;
 896
 897         for (i = 0; i < conf.key_map_given; ++i) {
 898                 s = conf.key_map_arg[i];
 899                 if (!(*s))
 900                         goto err_out;
 901                 free(tmp);
 902                 tmp = para_strdup(s);
 903                 if (!split_key_map(tmp, &handler, &arg))
 904                         goto err_out;
 905                 if (strlen(handler) != 1)
 906                         goto err_out;
 907                 if (*handler != 'x'
 908                         && *handler != 'd'
 909                         && *handler != 'i'
 910                         && *handler != 'p')
 911                         goto err_out;
 912                 if (*handler != 'i')
 913                         continue;
 914                 if (find_cmd_byname(arg) < 0)
 915                         goto err_out;
 916         }
 917         ret = 0;
 918 err_out:
 919         free(tmp);
 920         return ret;
 921 }
 922
 923 /*
 924  * React to various signal-related events
 925  */
 926 static void handle_signal(int sig)
 927 {
 928         switch (sig) {
 929         case SIGTERM:
 930                 msg_n_exit(EXIT_FAILURE,
 931                         "only the good die young (caught SIGTERM))\n");
 932                 return;
 933         case SIGWINCH:
 934                 if (curses_active) {
 935                         shutdown_curses();
 936                         init_curses();
 937                         redraw_bot_win();
 938                 }
 939                 return;
 940         case SIGINT:
 941                 PARA_WARNING_LOG("caught SIGINT, reset");
 942                 /* Nothing to do. SIGINT killed our child which gets noticed
 943                  * by do_select and resets everything.
 944                  */
 945                 return;
 946         case SIGUSR1:
 947                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 948                 com_reread_conf();
 949                 return;
 950         case SIGCHLD:
 951                 check_sigchld();
 952                 return;
 953         }
 954 }
 955
 956 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 957 {
 958         static struct timeval next_exec, atm, diff;
 959         int ret, fds[3] = {0, 1, 0};
 960         pid_t pid;
 961
 962         if (stat_pipe >= 0)
 963                 goto success;
 964         /* Avoid busy loop */
 965         gettimeofday(&atm, NULL);
 966         if (tv_diff(&next_exec, &atm, &diff) > 0) {
 967                 if (tv_diff(&diff, tv, NULL) < 0)
 968                         *tv = diff;
 969                 return;
 970         }
 971         next_exec.tv_sec = atm.tv_sec + 2;
 972         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 973         if (ret < 0)
 974                 return;
 975         ret = mark_fd_nonblocking(fds[1]);
 976         if (ret < 0) {
 977                 close(fds[1]);
 978                 return;
 979         }
 980         stat_pipe = fds[1];
 981 success:
 982         para_fd_set(stat_pipe, rfds, max_fileno);
 983 }
 984
 985 #define COMMAND_BUF_SIZE 32768
 986
 987 /*
 988  * This is the core select loop. Besides the (internal) signal
 989  * pipe, the following other fds are checked according to the mode:
 990  *
 991  * GETCH_MODE: check stdin, return when key is pressed
 992  *
 993  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 994  * stdout and stderr or when any key is pressed.
 995  *
 996  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 997  * is running. During that time curses is disabled.  Returns when
 998  * cmd_pid == 0.
 999  */
1000 static int do_select(int mode)
1001 {
1002         fd_set rfds;
1003         int ret, i, max_fileno;
1004         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
1005         int cbo[2] = {0, 0}; /* command buf offsets */
1006         struct timeval tv;
1007         unsigned flags[2] = {0, 0}; /* for for_each_line() */
1008
1009 repeat:
1010         tv.tv_sec = conf.timeout_arg  / 1000;
1011         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
1012 //      ret = refresh_status();
1013         FD_ZERO(&rfds);
1014         max_fileno = 0;
1015         status_pre_select(&rfds, &max_fileno, &tv);
1016         /* signal pipe */
1017         para_fd_set(signal_pipe, &rfds, &max_fileno);
1018         /* command pipe only for COMMAND_MODE */
1019         if (mode == COMMAND_MODE) {
1020                 if (command_fds[0] >= 0)
1021                         para_fd_set(command_fds[0], &rfds, &max_fileno);
1022                 if (command_fds[1] >= 0)
1023                         para_fd_set(command_fds[1], &rfds, &max_fileno);
1024         }
1025         if (mode == GETCH_MODE || mode == COMMAND_MODE)
1026                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1027         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1028         if (ret <= 0)
1029                 goto check_return; /* skip fd checks */
1030         /* signals */
1031         ret = para_next_signal(&rfds);
1032         if (ret > 0)
1033                 handle_signal(ret);
1034         /* read command pipe if ready */
1035         if (mode == COMMAND_MODE) {
1036                 for (i = 0; i < 2; i++) {
1037                         size_t sz;
1038                         if (command_fds[i] < 0)
1039                                 continue;
1040                         ret = read_nonblock(command_fds[i],
1041                                 command_buf[i] + cbo[i],
1042                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1043                         cbo[i] += sz;
1044                         sz = cbo[i];
1045                         cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1046                                 add_output_line, &i);
1047                         if (sz != cbo[i]) { /* at least one line found */
1048                                 wrefresh(bot.win);
1049                                 flags[i] = 0;
1050                         }
1051                         if (ret < 0) {
1052                                 PARA_NOTICE_LOG("closing command fd %d: %s",
1053                                         i, para_strerror(-ret));
1054                                 close(command_fds[i]);
1055                                 command_fds[i] = -1;
1056                                 flags[i] = 0;
1057                                 if (command_fds[!i] < 0) /* both fds closed */
1058                                         return 0;
1059                         }
1060                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1061                                 PARA_NOTICE_LOG("discarding overlong line");
1062                                 cbo[i] = 0;
1063                                 flags[i] = FELF_DISCARD_FIRST;
1064                         }
1065                 }
1066         }
1067         ret = read_stat_pipe(&rfds);
1068         if (ret < 0) {
1069                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1070                 close(stat_pipe);
1071                 stat_pipe = -1;
1072                 clear_all_items();
1073                 free(stat_content[SI_BASENAME]);
1074                 stat_content[SI_BASENAME] =
1075                         para_strdup("stat command terminated!?");
1076                 print_all_items();
1077         }
1078 check_return:
1079         switch (mode) {
1080         case COMMAND_MODE:
1081                 ret = wgetch(top.win);
1082                 if (ret != ERR && ret != KEY_RESIZE) {
1083                         if (command_fds[0] >= 0) {
1084                                 close(command_fds[0]);
1085                                 command_fds[0] = -1;
1086                         }
1087                         if (command_fds[1] >= 0) {
1088                                 close(command_fds[1]);
1089                                 command_fds[1] = -1;
1090                         }
1091                         if (cmd_pid)
1092                                 kill(cmd_pid, SIGTERM);
1093                         return -1;
1094                 }
1095                 break;
1096         case GETCH_MODE:
1097                 ret = wgetch(top.win);
1098                 if (ret != ERR && ret != KEY_RESIZE)
1099                         return ret;
1100                 break;
1101         case EXTERNAL_MODE:
1102                 if (cmd_pid == 0)
1103                         return 0;
1104         }
1105         goto repeat;
1106 }
1107
1108 /*
1109  * read from command pipe and print data to bot window
1110  */
1111 static void send_output(void)
1112 {
1113         int ret;
1114
1115         ret = mark_fd_nonblocking(command_fds[0]);
1116         if (ret < 0)
1117                 goto fail;
1118         ret = mark_fd_nonblocking(command_fds[1]);
1119         if (ret < 0)
1120                 goto fail;
1121         if (do_select(COMMAND_MODE) >= 0)
1122                 PARA_INFO_LOG("command complete");
1123         else
1124                 PARA_NOTICE_LOG("command aborted");
1125         print_in_bar(COLOR_MSG, " ");
1126         return;
1127 fail:
1128         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1129         close(command_fds[0]);
1130         close(command_fds[1]);
1131 }
1132
1133 static void para_cmd(char *cmd)
1134 {
1135         int ret, fds[3] = {0, 1, 1};
1136         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1137
1138         outputf(COLOR_COMMAND, "%s", c);
1139         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1140         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1141         free(c);
1142         if (ret < 0)
1143                 return;
1144         command_fds[0] = fds[1];
1145         command_fds[1] = fds[2];
1146         send_output();
1147 }
1148
1149 /*
1150  * exec command and print output to bot win
1151  */
1152 static void display_cmd(char *cmd)
1153 {
1154         int fds[3] = {0, 1, 1};
1155
1156         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1157         outputf(COLOR_COMMAND, "%s", cmd);
1158         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1159                 return;
1160         command_fds[0] = fds[1];
1161         command_fds[1] = fds[2];
1162         send_output();
1163 }
1164
1165 /*
1166  * shutdown curses and stat pipe before executing external commands
1167  */
1168 static void external_cmd(char *cmd)
1169 {
1170         int fds[3] = {-1, -1, -1};
1171
1172         if (cmd_pid)
1173                 return;
1174         shutdown_curses();
1175         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1176                 return;
1177         do_select(EXTERNAL_MODE);
1178         init_curses();
1179 }
1180
1181 static void print_scroll_msg(void)
1182 {
1183         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1184         int first_rbe = first_visible_rbe(&lines_total);
1185         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1186                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1187 }
1188
1189 static void com_scroll_top(void)
1190 {
1191         int i = RINGBUFFER_SIZE - 1;
1192         unsigned lines = 0;
1193
1194         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1195                 i--;
1196         /* i is oldest entry */
1197         for (; lines < bot.lines && i >= 0; i--) {
1198                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1199                 if (!rbe)
1200                         break;
1201                 lines += NUM_LINES(rbe->len);
1202         }
1203         i++;
1204         if (lines > 0 && scroll_position != i) {
1205                 scroll_position = i;
1206                 redraw_bot_win();
1207                 print_scroll_msg();
1208                 return;
1209         }
1210         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1211 }
1212
1213 static void com_cancel_scrolling(void)
1214 {
1215
1216         if (scroll_position == 0) {
1217                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1218                 return;
1219         }
1220         scroll_position = 0;
1221         redraw_bot_win();
1222 }
1223
1224 static void com_page_down(void)
1225 {
1226         unsigned lines = 0;
1227         int i = scroll_position;
1228         while (lines < bot.lines && --i > 0) {
1229                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1230                 if (!rbe)
1231                         break;
1232                 lines += NUM_LINES(rbe->len);
1233         }
1234         if (lines) {
1235                 scroll_position = i;
1236                 redraw_bot_win();
1237                 print_scroll_msg();
1238                 return;
1239         }
1240         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1241 }
1242
1243 static void com_page_up(void)
1244 {
1245         unsigned lines;
1246         int fvr = first_visible_rbe(&lines);
1247
1248         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1249                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1250                 return;
1251         }
1252         scroll_position = fvr + 1;
1253         for (; scroll_position > 0; scroll_position--) {
1254                 first_visible_rbe(&lines);
1255                 if (lines == bot.lines)
1256                         break;
1257         }
1258         redraw_bot_win();
1259         print_scroll_msg();
1260 }
1261
1262 static void com_scroll_down(void)
1263 {
1264         struct rb_entry *rbe;
1265         int rbe_lines;
1266
1267         if (!scroll_position) {
1268                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1269                 return;
1270         }
1271         scroll_position--;
1272         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1273         rbe_lines = NUM_LINES(rbe->len);
1274         wscrl(bot.win, rbe_lines);
1275         wmove(bot.win, bot.lines - rbe_lines, 0);
1276         wattron(bot.win, COLOR_PAIR(rbe->color));
1277         waddstr(bot.win, rbe->msg);
1278         wrefresh(bot.win);
1279         print_scroll_msg();
1280 }
1281
1282 static void com_scroll_up(void)
1283 {
1284         struct rb_entry *rbe = NULL;
1285         unsigned lines;
1286         int i, first_rbe, num_scroll;
1287
1288         /* the entry that is going to vanish */
1289         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1290         if (!rbe)
1291                 goto err_out;
1292         num_scroll = NUM_LINES(rbe->len);
1293         first_rbe = first_visible_rbe(&lines);
1294         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1295                 goto err_out;
1296         scroll_position++;
1297         wscrl(bot.win, -num_scroll);
1298         i = draw_top_rbe(&lines);
1299         if (i < 0)
1300                 goto err_out;
1301         while (i > 0 && lines < num_scroll) {
1302                 int rbe_lines;
1303                 rbe = ringbuffer_get(bot_win_rb, --i);
1304                 if (!rbe)
1305                         break;
1306                 rbe_lines = NUM_LINES(rbe->len);
1307                 lines += rbe_lines;
1308 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1309                 wattron(bot.win, COLOR_PAIR(rbe->color));
1310                 waddstr(bot.win, "\n");
1311                 waddstr(bot.win, rbe->msg);
1312                 if (!i)
1313                         break;
1314                 i--;
1315         }
1316         wrefresh(bot.win);
1317         print_scroll_msg();
1318         return;
1319 err_out:
1320         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1321 }
1322
1323 static void com_ll_decr(void)
1324 {
1325         if (loglevel <= LL_DEBUG) {
1326                 print_in_bar(COLOR_ERRMSG,
1327                         "loglevel already at maximal verbosity\n");
1328                 return;
1329         }
1330         loglevel--;
1331         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1332 }
1333
1334 static void com_ll_incr(void)
1335 {
1336         if (loglevel >= LL_EMERG) {
1337                 print_in_bar(COLOR_ERRMSG,
1338                         "loglevel already at minimal verbosity\n");
1339                 return;
1340         }
1341         loglevel++;
1342         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1343 }
1344
1345 /*
1346  * reread configuration, terminate on errors
1347  */
1348 static void com_reread_conf(void)
1349 {
1350         char *cf =configfile_exists();
1351         struct gui_cmdline_parser_params params = {
1352                 .override = 1,
1353                 .initialize = 1,
1354                 .check_required = 0,
1355                 .check_ambiguity = 0,
1356                 .print_errors = 0,
1357         };
1358
1359         if (!cf) {
1360                 PARA_WARNING_LOG("there is no configuration to read");
1361                 return;
1362         }
1363         PARA_INFO_LOG("rereading command line options and config file");
1364         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1365         gui_cmdline_parser_config_file(cf, &conf, &params);
1366         PARA_NOTICE_LOG("config file reloaded");
1367         if (check_key_map_args() < 0)
1368                 finish(EXIT_FAILURE);
1369 }
1370
1371 static void com_help(void)
1372 {
1373         int i;
1374
1375         for (i = 0; i < conf.key_map_given; ++i) {
1376                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1377                 const char *handler_text = "???", *desc = NULL;
1378
1379                 if (!split_key_map(tmp, &handler, &arg)) {
1380                         free(tmp);
1381                         return;
1382                 }
1383                 switch (*handler) {
1384                         case 'i':
1385                                 handler_text = "internal";
1386                                 desc = command_list[find_cmd_byname(arg)].description;
1387                                 break;
1388                         case 'x': handler_text = "external"; break;
1389                         case 'd': handler_text = "display "; break;
1390                         case 'p': handler_text = "para    "; break;
1391                 }
1392                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1393                         strlen(arg) < 8? "\t" : "",
1394                         desc? desc : "");
1395                 free(tmp);
1396         }
1397         for (i = 0; command_list[i].handler; i++) {
1398                 struct gui_command gc = command_list[i];
1399
1400                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1401                         strlen(gc.name) < 8? "\t" : "",
1402                         gc.description);
1403         }
1404         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1405                 "for more info");
1406 }
1407
1408 static void com_shrink_top_win(void)
1409 {
1410         if (top.lines <= theme.top_lines_min) {
1411                 PARA_WARNING_LOG("can not decrease top window");
1412                 return;
1413         }
1414         init_wins(top.lines - 1);
1415         wclear(top.win);
1416         print_all_items();
1417         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1418 }
1419
1420 static void com_enlarge_top_win(void)
1421 {
1422         if (bot.lines < 3) {
1423                 PARA_WARNING_LOG("can not increase top window");
1424                 return;
1425         }
1426         init_wins(top.lines + 1);
1427         wclear(top.win);
1428         print_all_items();
1429         print_in_bar(COLOR_MSG, "increased top window");
1430 }
1431
1432 static void com_version(void)
1433 {
1434         print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1435 }
1436
1437 __noreturn static void com_quit(void)
1438 {
1439         finish(0);
1440 }
1441
1442 static void com_refresh(void)
1443 {
1444         shutdown_curses();
1445         init_curses();
1446 }
1447
1448 static void change_theme(int next)
1449 {
1450         if (next)
1451                 next_theme(&theme);
1452         else
1453                 prev_theme(&theme);
1454         /* This seems to be needed twice, why? */
1455         com_refresh();
1456         com_refresh();
1457         PARA_NOTICE_LOG("new theme: %s", theme.name);
1458 }
1459
1460 static void com_next_theme(void)
1461 {
1462         change_theme(1);
1463 }
1464
1465 static void com_prev_theme(void)
1466 {
1467         change_theme(0);
1468 }
1469
1470
1471 static void handle_command(int c)
1472 {
1473         int i;
1474
1475         /* first check user's key bindings */
1476         for (i = 0; i < conf.key_map_given; ++i) {
1477                 char *tmp, *handler, *arg;
1478
1479                 tmp = para_strdup(conf.key_map_arg[i]);
1480                 if (!split_key_map(tmp, &handler, &arg)) {
1481                         free(tmp);
1482                         return;
1483                 }
1484                 if (strcmp(tmp, km_keyname(c))) {
1485                         free(tmp);
1486                         continue;
1487                 }
1488                 if (*handler == 'd')
1489                         display_cmd(arg);
1490                 else if (*handler == 'x')
1491                         external_cmd(arg);
1492                 else if (*handler == 'p')
1493                         para_cmd(arg);
1494                 else if (*handler == 'i') {
1495                         int num = find_cmd_byname(arg);
1496                         if (num >= 0)
1497                                 command_list[num].handler();
1498                 }
1499                 free(tmp);
1500                 return;
1501         }
1502         /* not found, check internal key bindings */
1503         for (i = 0; command_list[i].handler; i++) {
1504                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1505                         command_list[i].handler();
1506                         return;
1507                 }
1508         }
1509         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1510                 km_keyname(c));
1511 }
1512
1513 __noreturn static void print_help_and_die(void)
1514 {
1515         struct ggo_help h = DEFINE_GGO_HELP(gui);
1516         bool d = conf.detailed_help_given;
1517
1518         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1519         exit(0);
1520 }
1521
1522 int main(int argc, char *argv[])
1523 {
1524         int ret;
1525         char *cf;
1526
1527         _argc = argc;
1528         _argv = argv;
1529
1530         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1531         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1532         version_handle_flag("gui", conf.version_given);
1533         if (conf.help_given || conf.detailed_help_given)
1534                 print_help_and_die();
1535         cf = configfile_exists();
1536         if (!cf && conf.config_file_given) {
1537                 fprintf(stderr, "can not read config file %s\n",
1538                         conf.config_file_arg);
1539                 exit(EXIT_FAILURE);
1540         }
1541         if (cf) {
1542                 struct gui_cmdline_parser_params params = {
1543                         .override = 0,
1544                         .initialize = 0,
1545                         .check_required = 0,
1546                         .check_ambiguity = 0,
1547                         .print_errors = 1,
1548                 };
1549                 gui_cmdline_parser_config_file(cf, &conf, &params);
1550                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1551         }
1552         if (check_key_map_args() < 0) {
1553                 fprintf(stderr, "invalid key map\n");
1554                 exit(EXIT_FAILURE);
1555         }
1556         init_theme_or_die(conf.theme_arg, &theme);
1557         top.lines = theme.top_lines_default;
1558         setup_signal_handling();
1559         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1560         setlocale(LC_CTYPE, "");
1561         initscr(); /* needed only once, always successful */
1562         init_curses();
1563         print_welcome();
1564         for (;;) {
1565                 print_status_bar();
1566                 ret = do_select(GETCH_MODE);
1567                 if (!ret)
1568                         continue;
1569                 print_in_bar(COLOR_MSG, " ");
1570                 handle_command(ret);
1571         }
1572 }