gui.c

   1 /*
   2  * Copyright (C) 1998-2013 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c Curses-based interface for paraslash. */
   8
   9 #include <regex.h>
  10 #include <signal.h>
  11 #include <sys/types.h>
  12 #include <curses.h>
  13 #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         para_sigaction(SIGHUP, SIG_IGN);
 564 }
 565
 566 /* kill every process in the process group and exit */
 567 __noreturn static void kill_pg_and_die(int ret)
 568 {
 569         para_sigaction(SIGTERM, SIG_IGN);
 570         kill(0, SIGTERM);
 571         exit(ret);
 572 }
 573
 574 static void shutdown_curses(void)
 575 {
 576         if (!curses_active)
 577                 return;
 578         def_prog_mode();
 579         curses_active = 0;
 580         endwin();
 581 }
 582
 583 __noreturn static void finish(int ret)
 584 {
 585         shutdown_curses();
 586         kill_pg_and_die(ret);
 587 }
 588
 589 /*
 590  * exit curses and print given message to stdout/stderr
 591  */
 592 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 593 {
 594         va_list argp;
 595         FILE *outfd = ret? stderr: stdout;
 596
 597         shutdown_curses();
 598         va_start(argp, fmt);
 599         vfprintf(outfd, fmt, argp);
 600         va_end(argp);
 601         kill_pg_and_die(ret);
 602 }
 603
 604 static void print_welcome(void)
 605 {
 606         if (loglevel > LL_NOTICE)
 607                 return;
 608         outputf(COLOR_WELCOME, "Welcome to %s. Theme: %s",
 609                 version_single_line("gui"), theme.name);
 610         wclrtoeol(bot.win);
 611 }
 612
 613 /*
 614  * init all windows
 615  */
 616 static void init_wins(int top_lines)
 617 {
 618         int i;
 619
 620         top.lines = top_lines;
 621         top.cols = COLS;
 622         top.begy = 0;
 623         top.begx = 0;
 624
 625         bot.lines = LINES - top.lines - 3;
 626         bot.cols = COLS;
 627         bot.begy = top.lines + 1;
 628         bot.begx = 0;
 629
 630         sb.lines = 1;
 631         sb.cols = COLS;
 632         sb.begy = LINES - 2;
 633         sb.begx = 0;
 634
 635         in.lines = 1;
 636         in.cols = COLS;
 637         in.begy = LINES - 1;
 638         in.begx = 0;
 639
 640         sep.lines = 1;
 641         sep.cols = COLS;
 642         sep.begy = top.lines;
 643         sep.begx = 0;
 644
 645         assume_default_colors(theme.default_fg, theme.default_bg);
 646         if (top.win) {
 647                 mvwin(top.win, top.begy, top.begx);
 648                 wresize(top.win, top.lines, top.cols);
 649
 650                 mvwin(sb.win, sb.begy, sb.begx);
 651                 wresize(sb.win, sb.lines, sb.cols);
 652
 653                 mvwin(sep.win, sep.begy, sep.begx);
 654                 wresize(sep.win, sep.lines, sep.cols);
 655
 656                 mvwin(bot.win, bot.begy, bot.begx);
 657                 wresize(bot.win, bot.lines, bot.cols);
 658
 659                 mvwin(in.win, in.begy, in.begx);
 660                 wresize(in.win, in.lines, in.cols);
 661         } else {
 662                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 663                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 664                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 665                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 666                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 667                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 668                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 669                 wclear(bot.win);
 670                 wclear(sb.win);
 671                 wclear(in.win);
 672                 scrollok(bot.win, 1);
 673                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 674                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 675                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 676                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 677                 nodelay(top.win, 1);
 678                 nodelay(bot.win, 1);
 679                 nodelay(sb.win, 1);
 680                 nodelay(in.win, 0);
 681
 682                 keypad(top.win, 1);
 683                 keypad(bot.win, 1);
 684                 keypad(sb.win, 1);
 685                 keypad(in.win, 1);
 686                 print_status_bar();
 687         }
 688         wmove(sep.win, 0, 0);
 689         for (i = 1; i <= COLS; i++)
 690                 waddstr(sep.win, theme.sep_str);
 691         wclear(top.win);
 692         //wclear(bot.win);
 693         wnoutrefresh(top.win);
 694         wnoutrefresh(bot.win);
 695         //wnoutrefresh(sb.win);
 696         print_status_bar();
 697         wnoutrefresh(in.win);
 698         wnoutrefresh(sep.win);
 699         doupdate();
 700 }
 701
 702 /*
 703  * Print stat item #i to curses window
 704  */
 705 static void print_stat_item(int i)
 706 {
 707         char *tmp;
 708         struct stat_item_data d = theme.data[i];
 709         char *c = stat_content[i];
 710
 711         if (!curses_active || !d.len || !c)
 712                 return;
 713         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 714         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 715         wrefresh(top.win);
 716         wattron(top.win, COLOR_PAIR(i + 1));
 717         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 718         free(tmp);
 719         wrefresh(top.win);
 720 }
 721
 722 static int update_item(int item_num, char *buf)
 723 {
 724         char **c = stat_content + item_num;
 725
 726         free(*c);
 727         if (buf && buf[0])
 728                 goto dup;
 729         switch (item_num) {
 730         case SI_ARTIST:
 731                 *c = para_strdup("(artist tag not set)");
 732                 goto print;
 733         case SI_TITLE:
 734                 *c = para_strdup("(title tag not set)");
 735                 goto print;
 736         case SI_YEAR:
 737                 *c = para_strdup("????");
 738                 goto print;
 739         case SI_ALBUM:
 740                 *c = para_strdup("(album tag not set)");
 741                 goto print;
 742         case SI_COMMENT:
 743                 *c = para_strdup("(comment tag not set)");
 744                 goto print;
 745         }
 746 dup:
 747         *c = para_strdup(buf);
 748 print:
 749         print_stat_item(item_num);
 750         return 1;
 751 }
 752
 753 static int read_stat_pipe(fd_set *rfds)
 754 {
 755         static char *buf;
 756         static int bufsize, loaded;
 757         int ret, ret2;
 758         size_t sz;
 759
 760         if (stat_pipe < 0)
 761                 return 0;
 762         if (loaded >= bufsize) {
 763                 if (bufsize > 1000 * 1000) {
 764                         loaded = 0;
 765                         return 0;
 766                 }
 767                 bufsize += bufsize + 1000;
 768                 buf = para_realloc(buf, bufsize);
 769         }
 770         assert(loaded < bufsize);
 771         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 772                 rfds, &sz);
 773         loaded += sz;
 774         ret2 = for_each_stat_item(buf, loaded, update_item);
 775         if (ret < 0 || ret2 < 0) {
 776                 loaded = 0;
 777                 return ret2 < 0? ret2 : ret;
 778         }
 779         sz = ret2; /* what is left */
 780         if (sz > 0 && sz < loaded)
 781                 memmove(buf, buf + loaded - sz, sz);
 782         loaded = sz;
 783         return 1;
 784 }
 785
 786 static void print_all_items(void)
 787 {
 788         int i;
 789
 790         if (!curses_active)
 791                 return;
 792         FOR_EACH_STATUS_ITEM(i)
 793                 print_stat_item(i);
 794 }
 795
 796 static void clear_all_items(void)
 797 {
 798         int i;
 799
 800         FOR_EACH_STATUS_ITEM(i) {
 801                 free(stat_content[i]);
 802                 stat_content[i] = para_strdup("");
 803         }
 804 }
 805
 806 static void init_pair_or_die(short pair, short f, short b)
 807 {
 808         if (init_pair(pair, f, b) == ERR)
 809                 msg_n_exit(EXIT_FAILURE, "fatal: init_pair() failed\n");
 810 }
 811
 812 static void init_colors_or_die(void)
 813 {
 814         int i;
 815
 816         if (!has_colors())
 817                 msg_n_exit(EXIT_FAILURE, "fatal: No color term\n");
 818         if (start_color() == ERR)
 819                 msg_n_exit(EXIT_FAILURE, "fatal: failed to start colors\n");
 820         FOR_EACH_STATUS_ITEM(i)
 821                 if (theme.data[i].len)
 822                         init_pair_or_die(i + 1, theme.data[i].fg,
 823                                 theme.data[i].bg);
 824         init_pair_or_die(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 825         init_pair_or_die(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 826         init_pair_or_die(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 827         init_pair_or_die(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 828         init_pair_or_die(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 829         init_pair_or_die(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 830         init_pair_or_die(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 831         init_pair_or_die(COLOR_TOP, theme.default_fg, theme.default_bg);
 832         init_pair_or_die(COLOR_BOT, theme.default_fg, theme.default_bg);
 833 }
 834
 835 /* (Re-)initialize the curses library. */
 836 static void init_curses(void)
 837 {
 838         curses_active = 1;
 839         if (top.win && refresh() == ERR) /* refesh is really needed */
 840                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 841         if (LINES < theme.lines_min || COLS < theme.cols_min)
 842                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 843                         " (need at least %dx%d)\n", COLS, LINES,
 844                         theme.cols_min, theme.lines_min);
 845         curs_set(0); /* make cursor invisible, ignore errors */
 846         nonl(); /* do not NL->CR/NL on output, always returns OK */
 847         /* don't echo input */
 848         if (noecho() == ERR)
 849                 msg_n_exit(EXIT_FAILURE, "fatal: noecho() failed\n");
 850         /* take input chars one at a time, no wait for \n */
 851         if (cbreak() == ERR)
 852                 msg_n_exit(EXIT_FAILURE, "fatal: cbreak() failed\n");
 853         init_colors_or_die();
 854         clear(); /* ignore non-fatal errors */
 855         init_wins(theme.top_lines_default);
 856         print_all_items();
 857         // noecho(); /* don't echo input */
 858 }
 859
 860 static void check_sigchld(void)
 861 {
 862         int ret;
 863         pid_t pid;
 864 reap_next_child:
 865         ret = para_reap_child(&pid);
 866         if (ret <= 0)
 867                 return;
 868         if (pid == cmd_pid)
 869                 cmd_pid = 0;
 870         goto reap_next_child;
 871 }
 872
 873 /*
 874  * This sucker modifies its first argument. *handler and *arg are
 875  * pointers to 0-terminated strings (inside line). Crap.
 876  */
 877 static int split_key_map(char *line, char **handler, char **arg)
 878 {
 879         if (!(*handler = strchr(line + 1, ':')))
 880                 goto err_out;
 881         **handler = '\0';
 882         (*handler)++;
 883         if (!(*arg = strchr(*handler, ':')))
 884                 goto err_out;
 885         **arg = '\0';
 886         (*arg)++;
 887         return 1;
 888 err_out:
 889         return 0;
 890 }
 891
 892 static int check_key_map_args(void)
 893 {
 894         char *s;
 895         int i, ret = -1;
 896         char *tmp = NULL, *handler, *arg;
 897
 898         for (i = 0; i < conf.key_map_given; ++i) {
 899                 s = conf.key_map_arg[i];
 900                 if (!(*s))
 901                         goto err_out;
 902                 free(tmp);
 903                 tmp = para_strdup(s);
 904                 if (!split_key_map(tmp, &handler, &arg))
 905                         goto err_out;
 906                 if (strlen(handler) != 1)
 907                         goto err_out;
 908                 if (*handler != 'x'
 909                         && *handler != 'd'
 910                         && *handler != 'i'
 911                         && *handler != 'p')
 912                         goto err_out;
 913                 if (*handler != 'i')
 914                         continue;
 915                 if (find_cmd_byname(arg) < 0)
 916                         goto err_out;
 917         }
 918         ret = 0;
 919 err_out:
 920         free(tmp);
 921         return ret;
 922 }
 923
 924 /*
 925  * React to various signal-related events
 926  */
 927 static void handle_signal(int sig)
 928 {
 929         switch (sig) {
 930         case SIGTERM:
 931                 msg_n_exit(EXIT_FAILURE,
 932                         "only the good die young (caught SIGTERM))\n");
 933                 return;
 934         case SIGWINCH:
 935                 if (curses_active) {
 936                         shutdown_curses();
 937                         init_curses();
 938                         redraw_bot_win();
 939                 }
 940                 return;
 941         case SIGINT:
 942                 PARA_WARNING_LOG("caught SIGINT, reset");
 943                 /* Nothing to do. SIGINT killed our child which gets noticed
 944                  * by do_select and resets everything.
 945                  */
 946                 return;
 947         case SIGUSR1:
 948                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 949                 com_reread_conf();
 950                 return;
 951         case SIGCHLD:
 952                 check_sigchld();
 953                 return;
 954         }
 955 }
 956
 957 static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
 958 {
 959         static struct timeval next_exec, atm, diff;
 960         int ret, fds[3] = {0, 1, 0};
 961         pid_t pid;
 962
 963         if (stat_pipe >= 0)
 964                 goto success;
 965         /* Avoid busy loop */
 966         gettimeofday(&atm, NULL);
 967         if (tv_diff(&next_exec, &atm, &diff) > 0) {
 968                 if (tv_diff(&diff, tv, NULL) < 0)
 969                         *tv = diff;
 970                 return;
 971         }
 972         next_exec.tv_sec = atm.tv_sec + 2;
 973         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 974         if (ret < 0)
 975                 return;
 976         ret = mark_fd_nonblocking(fds[1]);
 977         if (ret < 0) {
 978                 close(fds[1]);
 979                 return;
 980         }
 981         stat_pipe = fds[1];
 982 success:
 983         para_fd_set(stat_pipe, rfds, max_fileno);
 984 }
 985
 986 #define COMMAND_BUF_SIZE 32768
 987
 988 /*
 989  * This is the core select loop. Besides the (internal) signal
 990  * pipe, the following other fds are checked according to the mode:
 991  *
 992  * GETCH_MODE: check stdin, return when key is pressed
 993  *
 994  * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
 995  * stdout and stderr or when any key is pressed.
 996  *
 997  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 998  * is running. During that time curses is disabled.  Returns when
 999  * cmd_pid == 0.
1000  */
1001 static int do_select(int mode)
1002 {
1003         fd_set rfds;
1004         int ret, i, max_fileno;
1005         char command_buf[2][COMMAND_BUF_SIZE] = {"", ""};
1006         int cbo[2] = {0, 0}; /* command buf offsets */
1007         struct timeval tv;
1008         unsigned flags[2] = {0, 0}; /* for for_each_line() */
1009
1010 repeat:
1011         tv.tv_sec = conf.timeout_arg  / 1000;
1012         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
1013 //      ret = refresh_status();
1014         FD_ZERO(&rfds);
1015         max_fileno = 0;
1016         status_pre_select(&rfds, &max_fileno, &tv);
1017         /* signal pipe */
1018         para_fd_set(signal_pipe, &rfds, &max_fileno);
1019         /* command pipe only for COMMAND_MODE */
1020         if (mode == COMMAND_MODE) {
1021                 if (command_fds[0] >= 0)
1022                         para_fd_set(command_fds[0], &rfds, &max_fileno);
1023                 if (command_fds[1] >= 0)
1024                         para_fd_set(command_fds[1], &rfds, &max_fileno);
1025         }
1026         if (mode == GETCH_MODE || mode == COMMAND_MODE)
1027                 para_fd_set(STDIN_FILENO, &rfds, &max_fileno);
1028         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
1029         if (ret <= 0)
1030                 goto check_return; /* skip fd checks */
1031         /* signals */
1032         ret = para_next_signal(&rfds);
1033         if (ret > 0)
1034                 handle_signal(ret);
1035         /* read command pipe if ready */
1036         if (mode == COMMAND_MODE) {
1037                 for (i = 0; i < 2; i++) {
1038                         size_t sz;
1039                         if (command_fds[i] < 0)
1040                                 continue;
1041                         ret = read_nonblock(command_fds[i],
1042                                 command_buf[i] + cbo[i],
1043                                 COMMAND_BUF_SIZE - 1 - cbo[i], &rfds, &sz);
1044                         cbo[i] += sz;
1045                         sz = cbo[i];
1046                         cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
1047                                 add_output_line, &i);
1048                         if (sz != cbo[i]) { /* at least one line found */
1049                                 wrefresh(bot.win);
1050                                 flags[i] = 0;
1051                         }
1052                         if (ret < 0) {
1053                                 PARA_NOTICE_LOG("closing command fd %d: %s",
1054                                         i, para_strerror(-ret));
1055                                 close(command_fds[i]);
1056                                 command_fds[i] = -1;
1057                                 flags[i] = 0;
1058                                 if (command_fds[!i] < 0) /* both fds closed */
1059                                         return 0;
1060                         }
1061                         if (cbo[i] == COMMAND_BUF_SIZE - 1) {
1062                                 PARA_NOTICE_LOG("discarding overlong line");
1063                                 cbo[i] = 0;
1064                                 flags[i] = FELF_DISCARD_FIRST;
1065                         }
1066                 }
1067         }
1068         ret = read_stat_pipe(&rfds);
1069         if (ret < 0) {
1070                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
1071                 close(stat_pipe);
1072                 stat_pipe = -1;
1073                 clear_all_items();
1074                 free(stat_content[SI_BASENAME]);
1075                 stat_content[SI_BASENAME] =
1076                         para_strdup("stat command terminated!?");
1077                 print_all_items();
1078         }
1079 check_return:
1080         switch (mode) {
1081         case COMMAND_MODE:
1082                 ret = wgetch(top.win);
1083                 if (ret != ERR && ret != KEY_RESIZE) {
1084                         if (command_fds[0] >= 0) {
1085                                 close(command_fds[0]);
1086                                 command_fds[0] = -1;
1087                         }
1088                         if (command_fds[1] >= 0) {
1089                                 close(command_fds[1]);
1090                                 command_fds[1] = -1;
1091                         }
1092                         if (cmd_pid)
1093                                 kill(cmd_pid, SIGTERM);
1094                         return -1;
1095                 }
1096                 break;
1097         case GETCH_MODE:
1098                 ret = wgetch(top.win);
1099                 if (ret != ERR && ret != KEY_RESIZE)
1100                         return ret;
1101                 break;
1102         case EXTERNAL_MODE:
1103                 if (cmd_pid == 0)
1104                         return 0;
1105         }
1106         goto repeat;
1107 }
1108
1109 /*
1110  * read from command pipe and print data to bot window
1111  */
1112 static void send_output(void)
1113 {
1114         int ret;
1115
1116         ret = mark_fd_nonblocking(command_fds[0]);
1117         if (ret < 0)
1118                 goto fail;
1119         ret = mark_fd_nonblocking(command_fds[1]);
1120         if (ret < 0)
1121                 goto fail;
1122         if (do_select(COMMAND_MODE) >= 0)
1123                 PARA_INFO_LOG("command complete");
1124         else
1125                 PARA_NOTICE_LOG("command aborted");
1126         print_in_bar(COLOR_MSG, " ");
1127         return;
1128 fail:
1129         PARA_ERROR_LOG("%s\n", para_strerror(-ret));
1130         close(command_fds[0]);
1131         close(command_fds[1]);
1132 }
1133
1134 static void para_cmd(char *cmd)
1135 {
1136         int ret, fds[3] = {0, 1, 1};
1137         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1138
1139         outputf(COLOR_COMMAND, "%s", c);
1140         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1141         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1142         free(c);
1143         if (ret < 0)
1144                 return;
1145         command_fds[0] = fds[1];
1146         command_fds[1] = fds[2];
1147         send_output();
1148 }
1149
1150 /*
1151  * exec command and print output to bot win
1152  */
1153 static void display_cmd(char *cmd)
1154 {
1155         int fds[3] = {0, 1, 1};
1156
1157         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1158         outputf(COLOR_COMMAND, "%s", cmd);
1159         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1160                 return;
1161         command_fds[0] = fds[1];
1162         command_fds[1] = fds[2];
1163         send_output();
1164 }
1165
1166 /*
1167  * shutdown curses and stat pipe before executing external commands
1168  */
1169 static void external_cmd(char *cmd)
1170 {
1171         int fds[3] = {-1, -1, -1};
1172
1173         if (cmd_pid)
1174                 return;
1175         shutdown_curses();
1176         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1177                 return;
1178         do_select(EXTERNAL_MODE);
1179         init_curses();
1180 }
1181
1182 static void print_scroll_msg(void)
1183 {
1184         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1185         int first_rbe = first_visible_rbe(&lines_total);
1186         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1187                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1188 }
1189
1190 static void com_scroll_top(void)
1191 {
1192         int i = RINGBUFFER_SIZE - 1;
1193         unsigned lines = 0;
1194
1195         while (i > 0 && !ringbuffer_get(bot_win_rb, i))
1196                 i--;
1197         /* i is oldest entry */
1198         for (; lines < bot.lines && i >= 0; i--) {
1199                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1200                 if (!rbe)
1201                         break;
1202                 lines += NUM_LINES(rbe->len);
1203         }
1204         i++;
1205         if (lines > 0 && scroll_position != i) {
1206                 scroll_position = i;
1207                 redraw_bot_win();
1208                 print_scroll_msg();
1209                 return;
1210         }
1211         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1212 }
1213
1214 static void com_cancel_scrolling(void)
1215 {
1216
1217         if (scroll_position == 0) {
1218                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1219                 return;
1220         }
1221         scroll_position = 0;
1222         redraw_bot_win();
1223 }
1224
1225 static void com_page_down(void)
1226 {
1227         unsigned lines = 0;
1228         int i = scroll_position;
1229         while (lines < bot.lines && --i > 0) {
1230                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1231                 if (!rbe)
1232                         break;
1233                 lines += NUM_LINES(rbe->len);
1234         }
1235         if (lines) {
1236                 scroll_position = i;
1237                 redraw_bot_win();
1238                 print_scroll_msg();
1239                 return;
1240         }
1241         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1242 }
1243
1244 static void com_page_up(void)
1245 {
1246         unsigned lines;
1247         int fvr = first_visible_rbe(&lines);
1248
1249         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1250                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1251                 return;
1252         }
1253         scroll_position = fvr + 1;
1254         for (; scroll_position > 0; scroll_position--) {
1255                 first_visible_rbe(&lines);
1256                 if (lines == bot.lines)
1257                         break;
1258         }
1259         redraw_bot_win();
1260         print_scroll_msg();
1261 }
1262
1263 static void com_scroll_down(void)
1264 {
1265         struct rb_entry *rbe;
1266         int rbe_lines;
1267
1268         if (!scroll_position) {
1269                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1270                 return;
1271         }
1272         scroll_position--;
1273         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1274         rbe_lines = NUM_LINES(rbe->len);
1275         wscrl(bot.win, rbe_lines);
1276         wmove(bot.win, bot.lines - rbe_lines, 0);
1277         wattron(bot.win, COLOR_PAIR(rbe->color));
1278         waddstr(bot.win, rbe->msg);
1279         wrefresh(bot.win);
1280         print_scroll_msg();
1281 }
1282
1283 static void com_scroll_up(void)
1284 {
1285         struct rb_entry *rbe = NULL;
1286         unsigned lines;
1287         int i, first_rbe, num_scroll;
1288
1289         /* the entry that is going to vanish */
1290         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1291         if (!rbe)
1292                 goto err_out;
1293         num_scroll = NUM_LINES(rbe->len);
1294         first_rbe = first_visible_rbe(&lines);
1295         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1296                 goto err_out;
1297         scroll_position++;
1298         wscrl(bot.win, -num_scroll);
1299         i = draw_top_rbe(&lines);
1300         if (i < 0)
1301                 goto err_out;
1302         while (i > 0 && lines < num_scroll) {
1303                 int rbe_lines;
1304                 rbe = ringbuffer_get(bot_win_rb, --i);
1305                 if (!rbe)
1306                         break;
1307                 rbe_lines = NUM_LINES(rbe->len);
1308                 lines += rbe_lines;
1309 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1310                 wattron(bot.win, COLOR_PAIR(rbe->color));
1311                 waddstr(bot.win, "\n");
1312                 waddstr(bot.win, rbe->msg);
1313                 if (!i)
1314                         break;
1315                 i--;
1316         }
1317         wrefresh(bot.win);
1318         print_scroll_msg();
1319         return;
1320 err_out:
1321         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1322 }
1323
1324 static void com_ll_decr(void)
1325 {
1326         if (loglevel <= LL_DEBUG) {
1327                 print_in_bar(COLOR_ERRMSG,
1328                         "loglevel already at maximal verbosity\n");
1329                 return;
1330         }
1331         loglevel--;
1332         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1333 }
1334
1335 static void com_ll_incr(void)
1336 {
1337         if (loglevel >= LL_EMERG) {
1338                 print_in_bar(COLOR_ERRMSG,
1339                         "loglevel already at minimal verbosity\n");
1340                 return;
1341         }
1342         loglevel++;
1343         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1344 }
1345
1346 /*
1347  * reread configuration, terminate on errors
1348  */
1349 static void com_reread_conf(void)
1350 {
1351         char *cf =configfile_exists();
1352         struct gui_cmdline_parser_params params = {
1353                 .override = 1,
1354                 .initialize = 1,
1355                 .check_required = 0,
1356                 .check_ambiguity = 0,
1357                 .print_errors = 0,
1358         };
1359
1360         if (!cf) {
1361                 PARA_WARNING_LOG("there is no configuration to read");
1362                 return;
1363         }
1364         PARA_INFO_LOG("rereading command line options and config file");
1365         gui_cmdline_parser_ext(_argc, _argv, &conf, &params);
1366         gui_cmdline_parser_config_file(cf, &conf, &params);
1367         PARA_NOTICE_LOG("config file reloaded");
1368         if (check_key_map_args() < 0)
1369                 finish(EXIT_FAILURE);
1370 }
1371
1372 static void com_help(void)
1373 {
1374         int i;
1375
1376         for (i = 0; i < conf.key_map_given; ++i) {
1377                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1378                 const char *handler_text = "???", *desc = NULL;
1379
1380                 if (!split_key_map(tmp, &handler, &arg)) {
1381                         free(tmp);
1382                         return;
1383                 }
1384                 switch (*handler) {
1385                         case 'i':
1386                                 handler_text = "internal";
1387                                 desc = command_list[find_cmd_byname(arg)].description;
1388                                 break;
1389                         case 'x': handler_text = "external"; break;
1390                         case 'd': handler_text = "display "; break;
1391                         case 'p': handler_text = "para    "; break;
1392                 }
1393                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1394                         strlen(arg) < 8? "\t" : "",
1395                         desc? desc : "");
1396                 free(tmp);
1397         }
1398         for (i = 0; command_list[i].handler; i++) {
1399                 struct gui_command gc = command_list[i];
1400
1401                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1402                         strlen(gc.name) < 8? "\t" : "",
1403                         gc.description);
1404         }
1405         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1406                 "for more info");
1407 }
1408
1409 static void com_shrink_top_win(void)
1410 {
1411         if (top.lines <= theme.top_lines_min) {
1412                 PARA_WARNING_LOG("can not decrease top window");
1413                 return;
1414         }
1415         init_wins(top.lines - 1);
1416         wclear(top.win);
1417         print_all_items();
1418         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1419 }
1420
1421 static void com_enlarge_top_win(void)
1422 {
1423         if (bot.lines < 3) {
1424                 PARA_WARNING_LOG("can not increase top window");
1425                 return;
1426         }
1427         init_wins(top.lines + 1);
1428         wclear(top.win);
1429         print_all_items();
1430         print_in_bar(COLOR_MSG, "increased top window");
1431 }
1432
1433 static void com_version(void)
1434 {
1435         print_in_bar(COLOR_MSG, "%s", version_single_line("gui"));
1436 }
1437
1438 __noreturn static void com_quit(void)
1439 {
1440         finish(0);
1441 }
1442
1443 static void com_refresh(void)
1444 {
1445         shutdown_curses();
1446         init_curses();
1447 }
1448
1449 static void change_theme(int next)
1450 {
1451         if (next)
1452                 next_theme(&theme);
1453         else
1454                 prev_theme(&theme);
1455         /* This seems to be needed twice, why? */
1456         com_refresh();
1457         com_refresh();
1458         PARA_NOTICE_LOG("new theme: %s", theme.name);
1459 }
1460
1461 static void com_next_theme(void)
1462 {
1463         change_theme(1);
1464 }
1465
1466 static void com_prev_theme(void)
1467 {
1468         change_theme(0);
1469 }
1470
1471
1472 static void handle_command(int c)
1473 {
1474         int i;
1475
1476         /* first check user's key bindings */
1477         for (i = 0; i < conf.key_map_given; ++i) {
1478                 char *tmp, *handler, *arg;
1479
1480                 tmp = para_strdup(conf.key_map_arg[i]);
1481                 if (!split_key_map(tmp, &handler, &arg)) {
1482                         free(tmp);
1483                         return;
1484                 }
1485                 if (strcmp(tmp, km_keyname(c))) {
1486                         free(tmp);
1487                         continue;
1488                 }
1489                 if (*handler == 'd')
1490                         display_cmd(arg);
1491                 else if (*handler == 'x')
1492                         external_cmd(arg);
1493                 else if (*handler == 'p')
1494                         para_cmd(arg);
1495                 else if (*handler == 'i') {
1496                         int num = find_cmd_byname(arg);
1497                         if (num >= 0)
1498                                 command_list[num].handler();
1499                 }
1500                 free(tmp);
1501                 return;
1502         }
1503         /* not found, check internal key bindings */
1504         for (i = 0; command_list[i].handler; i++) {
1505                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1506                         command_list[i].handler();
1507                         return;
1508                 }
1509         }
1510         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1511                 km_keyname(c));
1512 }
1513
1514 __noreturn static void print_help_and_die(void)
1515 {
1516         struct ggo_help h = DEFINE_GGO_HELP(gui);
1517         bool d = conf.detailed_help_given;
1518
1519         ggo_print_help(&h, d? GPH_STANDARD_FLAGS_DETAILED : GPH_STANDARD_FLAGS);
1520         exit(0);
1521 }
1522
1523 int main(int argc, char *argv[])
1524 {
1525         int ret;
1526         char *cf;
1527
1528         _argc = argc;
1529         _argv = argv;
1530
1531         gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
1532         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1533         version_handle_flag("gui", conf.version_given);
1534         if (conf.help_given || conf.detailed_help_given)
1535                 print_help_and_die();
1536         cf = configfile_exists();
1537         if (!cf && conf.config_file_given) {
1538                 fprintf(stderr, "can not read config file %s\n",
1539                         conf.config_file_arg);
1540                 exit(EXIT_FAILURE);
1541         }
1542         if (cf) {
1543                 struct gui_cmdline_parser_params params = {
1544                         .override = 0,
1545                         .initialize = 0,
1546                         .check_required = 0,
1547                         .check_ambiguity = 0,
1548                         .print_errors = 1,
1549                 };
1550                 gui_cmdline_parser_config_file(cf, &conf, &params);
1551                 loglevel = get_loglevel_by_name(conf.loglevel_arg);
1552         }
1553         if (check_key_map_args() < 0) {
1554                 fprintf(stderr, "invalid key map\n");
1555                 exit(EXIT_FAILURE);
1556         }
1557         init_theme_or_die(conf.theme_arg, &theme);
1558         top.lines = theme.top_lines_default;
1559         setup_signal_handling();
1560         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1561         setlocale(LC_CTYPE, "");
1562         initscr(); /* needed only once, always successful */
1563         init_curses();
1564         print_welcome();
1565         for (;;) {
1566                 print_status_bar();
1567                 ret = do_select(GETCH_MODE);
1568                 if (!ret)
1569                         continue;
1570                 print_in_bar(COLOR_MSG, " ");
1571                 handle_command(ret);
1572         }
1573 }