gui.c

   1 /*
   2  * Copyright (C) 1998-2010 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 <dirent.h>
  13 #include <curses.h>
  14
  15 #include "gui.cmdline.h"
  16 #include "para.h"
  17 #include "gui.h"
  18 #include "string.h"
  19 #include "ringbuffer.h"
  20 #include "fd.h"
  21 #include "error.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "signal.h"
  25
  26 /** define the array of error lists needed by para_gui */
  27 INIT_GUI_ERRLISTS;
  28 static char *stat_content[NUM_STAT_ITEMS];
  29
  30 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  31
  32 static int signal_pipe;
  33
  34 static struct win_data {
  35         WINDOW *win;
  36         NCURSES_SIZE_T begx;
  37         NCURSES_SIZE_T begy;
  38         NCURSES_SIZE_T cols;
  39         NCURSES_SIZE_T lines;
  40 } top, bot, sb, in, sep;
  41
  42 #define RINGBUFFER_SIZE 512
  43 struct rb_entry {
  44         char *msg;
  45         size_t len;
  46         int color;
  47 };
  48 static struct ringbuffer *bot_win_rb;
  49 #define NUM_LINES(len) (1 + (len) / bot.cols)
  50
  51 static unsigned scroll_position;
  52
  53 static int cmd_died, curses_active;
  54 static pid_t cmd_pid;
  55
  56 static int command_pipe = -1;
  57 static int audiod_pipe = -1;
  58 static struct gui_args_info conf;
  59
  60 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  61
  62
  63 #define COLOR_STATUSBAR 52
  64 #define COLOR_COMMAND 53
  65 #define COLOR_OUTPUT 54
  66 #define COLOR_MSG 55
  67 #define COLOR_ERRMSG 56
  68 #define COLOR_WELCOME 57
  69 #define COLOR_SEPARATOR 58
  70 #define COLOR_TOP 59
  71 #define COLOR_BOT 60
  72
  73 struct gui_command {
  74         const char *key;
  75         const char *name;
  76         const char *description;
  77         void (*handler)(void);
  78 };
  79
  80 struct stat_item {
  81         char name[MAXLINE];
  82         char prefix[MAXLINE];
  83         char postfix[MAXLINE];
  84         unsigned y;
  85         unsigned x;
  86         unsigned len;
  87         int fg, bg;
  88         int align;
  89         char content[MAXLINE];
  90 };
  91
  92 static struct gui_theme theme;
  93
  94 static int _argc;
  95 static char **_argv;
  96
  97 static void com_help(void);
  98 static void com_reread_conf(void);
  99 static void com_enlarge_top_win(void);
 100 static void com_shrink_top_win(void);
 101 static void com_version(void);
 102 static void com_quit(void);
 103 static void com_refresh(void);
 104 static void com_ll_incr(void);
 105 static void com_ll_decr(void);
 106 static void com_prev_theme(void);
 107 static void com_next_theme(void);
 108 static void com_scroll_up(void);
 109 static void com_scroll_down(void);
 110 static void com_page_up(void);
 111 static void com_page_down(void);
 112
 113 static struct gui_command command_list[] = {
 114         {
 115                 .key = "?",
 116                 .name = "help",
 117                 .description = "print help",
 118                 .handler = com_help
 119         }, {
 120                 .key = "+",
 121                 .name = "enlarge_win",
 122                 .description = "enlarge the top window",
 123                 .handler = com_enlarge_top_win
 124         }, {
 125                 .key = "-",
 126                 .name = "shrink_win",
 127                 .description = "shrink the top window",
 128                 .handler = com_shrink_top_win
 129         }, {
 130                 .key = "r",
 131                 .name = "reread_conf",
 132                 .description = "reread configuration file",
 133                 .handler = com_reread_conf
 134         }, {
 135                 .key = "q",
 136                 .name = "quit",
 137                 .description = "exit para_gui",
 138                 .handler = com_quit
 139         }, {
 140                 .key = "^L",
 141                 .name = "refresh",
 142                 .description = "redraw the screen",
 143                 .handler = com_refresh
 144         }, {
 145                 .key = ".",
 146                 .name = "next_theme",
 147                 .description = "switch to next theme",
 148                 .handler = com_next_theme
 149         }, {
 150                 .key = ",",
 151                 .name = "prev_theme",
 152                 .description = "switch to previous stream",
 153                 .handler = com_prev_theme
 154         }, {
 155                 .key = ">",
 156                 .name = "ll_incr",
 157                 .description = "increase loglevel (decreases verbosity)",
 158                 .handler = com_ll_incr
 159         }, {
 160                 .key = "<",
 161                 .name = "ll_decr",
 162                 .description = "decrease loglevel (increases verbosity)",
 163                 .handler = com_ll_decr
 164         }, {
 165                 .key = "V",
 166                 .name = "version",
 167                 .description = "show the para_gui version",
 168                 .handler = com_version
 169         }, {
 170                 .key = "<up>",
 171                 .name = "scroll_up",
 172                 .description = "scroll up one line",
 173                 .handler = com_scroll_up
 174         }, {
 175                 .key = "<down>",
 176                 .name = "scroll_down",
 177                 .description = "scroll down one line",
 178                 .handler = com_scroll_down
 179         }, {
 180                 .key = "<ppage>",
 181                 .name = "page_up",
 182                 .description = "scroll up one page",
 183                 .handler = com_page_up
 184         }, {
 185                 .key = "<npage>",
 186                 .name = "page_down",
 187                 .description = "scroll down one page",
 188                 .handler = com_page_down
 189         }, {
 190                 .handler = NULL
 191         }
 192 };
 193
 194 static int para_open_audiod_pipe(char *cmd)
 195 {
 196         int fds[3] = {0, 1, 0};
 197         pid_t pid;
 198         int ret = para_exec_cmdline_pid(&pid, cmd, fds);
 199         if (ret < 0)
 200                 return ret;
 201         ret = mark_fd_nonblocking(fds[1]);
 202         if (ret > 0)
 203                 return fds[1];
 204         close(fds[1]);
 205         return ret;
 206 }
 207
 208 static int find_cmd_byname(char *name)
 209 {
 210         int i;
 211
 212         for (i = 0; command_list[i].handler; i++)
 213                 if (!strcmp(command_list[i].name, name))
 214                         return i;
 215         return -1;
 216 }
 217
 218 /* taken from mutt */
 219 static char *km_keyname(int c)
 220 {
 221         static char buf[10];
 222
 223         if (c == KEY_UP) {
 224                 sprintf(buf, "<up>");
 225                 return buf;
 226         }
 227         if (c == KEY_DOWN) {
 228                 sprintf(buf, "<down>");
 229                 return buf;
 230         }
 231         if (c == KEY_LEFT) {
 232                 sprintf(buf, "<left>");
 233                 return buf;
 234         }
 235         if (c == KEY_RIGHT) {
 236                 sprintf(buf, "<right>");
 237                 return buf;
 238         }
 239         if (c == KEY_NPAGE) {
 240                 sprintf(buf, "<npage>");
 241                 return buf;
 242         }
 243         if (c == KEY_PPAGE) {
 244                 sprintf(buf, "<ppage>");
 245                 return buf;
 246         }
 247         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 248                 if (c < 0)
 249                         c += 256;
 250                 if (c < 128) {
 251                         buf[0] = '^';
 252                         buf[1] = (c + '@') & 0x7f;
 253                         buf[2] = 0;
 254                 } else
 255                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 256                                 (c >> 3) & 7, c & 7);
 257         } else if (c >= KEY_F0 && c < KEY_F(256))
 258                 sprintf(buf, "<F%d>", c - KEY_F0);
 259         else if (isprint(c))
 260                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 261         else
 262                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 263         return buf;
 264 }
 265
 266 static char *configfile_exists(void)
 267 {
 268         static char *config_file;
 269         char *tmp;
 270
 271         if (!conf.config_file_given) {
 272                 if (!config_file) {
 273                         char *home = para_homedir();
 274                         config_file = make_message("%s/.paraslash/gui.conf",
 275                                 home);
 276                         free(home);
 277                 }
 278                 tmp = config_file;
 279         } else
 280                 tmp = conf.config_file_arg;
 281         return file_exists(tmp)? tmp: NULL;
 282 }
 283
 284 /*
 285  * print num spaces to curses window
 286  */
 287 static void add_spaces(WINDOW* win, unsigned int num)
 288 {
 289         while (num > 0) {
 290                 num--;
 291                 waddstr(win, " ");
 292         }
 293 }
 294
 295 /*
 296  * print aligned string to curses window. This function always prints
 297  * exactly len chars.
 298  */
 299 static int align_str(WINDOW* win, char *str, unsigned int len,
 300                 unsigned int align)
 301 {
 302         int i, num; /* of spaces */
 303
 304         if (!win || !str)
 305                 return -1;
 306         num = len - strlen(str);
 307         if (num < 0) {
 308                 str[len] = '\0';
 309                 num = 0;
 310         }
 311         /* replace newlines by spaces */
 312         for (i = 0; i < len && str[i]; i++) {
 313                 if (str[i] == '\n')
 314                         str[i] = ' ';
 315         }
 316         if (align == LEFT) {
 317                 waddstr(win, str);
 318                 add_spaces(win, num);
 319         } else if (align == RIGHT) {
 320                 add_spaces(win, num);
 321                 waddstr(win, str);
 322         } else {
 323                 add_spaces(win, num / 2);
 324                 waddstr(win, str[0]? str: "");
 325                 add_spaces(win, num - num / 2);
 326         }
 327         return 1;
 328 }
 329
 330 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 331 {
 332         char *msg;
 333
 334         if (!curses_active)
 335                 return;
 336         wattron(in.win, COLOR_PAIR(color));
 337         PARA_VSPRINTF(fmt, msg);
 338         wmove(in.win, 0, 0);
 339         align_str(in.win, msg, sb.cols, LEFT);
 340         free(msg);
 341         wrefresh(in.win);
 342 }
 343
 344 /*
 345  * update the status bar
 346  */
 347 static void print_status_bar(void)
 348 {
 349         char *tmp;
 350
 351         if (!curses_active)
 352                 return;
 353         tmp = para_strdup(STANDARD_STATUS_BAR);
 354         wmove(sb.win, 0, 0);
 355         align_str(sb.win, tmp, sb.cols, CENTER);
 356         free(tmp);
 357         wrefresh(sb.win);
 358 }
 359
 360 /*
 361  * get the number of the oldest rbe that is (partially) visible. On return,
 362  * lines contains the sum of the number of lines of all visable entries. If the
 363  * first one is only partially visible, lines is greater than bot.lines.
 364  */
 365 static int first_visible_rbe(unsigned *lines)
 366 {
 367         int i;
 368         *lines = 0;
 369         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 370                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 371                 int rbe_lines;
 372                 if (!rbe)
 373                         return i - 1;
 374 //              fprintf(stderr, "found: %s\n", rbe->msg);
 375                 rbe_lines = NUM_LINES(rbe->len);
 376                 if (rbe_lines > bot.lines)
 377                         return -1;
 378                 *lines += rbe_lines;
 379                 if (*lines >= bot.lines)
 380                         return i;
 381         }
 382         return RINGBUFFER_SIZE - 1;
 383 }
 384
 385 static int draw_top_rbe(unsigned *lines)
 386 {
 387         unsigned len;
 388         int offset, fvr = first_visible_rbe(lines);
 389         struct rb_entry *rbe;
 390
 391         if (fvr < 0)
 392                 return -1;
 393         wmove(bot.win, 0, 0);
 394         rbe = ringbuffer_get(bot_win_rb, fvr);
 395         if (!rbe)
 396                 return -1;
 397         /* first rbe might be only partially visible */
 398         offset = (*lines - bot.lines) * bot.cols;
 399         len = strlen(rbe->msg);
 400         if (offset < 0 || len < offset)
 401                 return -1;
 402         wattron(bot.win, COLOR_PAIR(rbe->color));
 403         waddstr(bot.win, rbe->msg + offset);
 404         *lines = NUM_LINES(len - offset);
 405         return fvr;
 406 }
 407
 408 static void redraw_bot_win(void)
 409 {
 410         unsigned lines;
 411         int i;
 412
 413         wmove(bot.win, 0, 0);
 414         wclear(bot.win);
 415         i = draw_top_rbe(&lines);
 416         if (i <= 0)
 417                 goto out;
 418         while (i > 0 && lines < bot.lines) {
 419                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 420                 if (!rbe) {
 421                         lines++;
 422                         waddstr(bot.win, "\n");
 423                         continue;
 424                 }
 425                 lines += NUM_LINES(rbe->len);
 426                 wattron(bot.win, COLOR_PAIR(rbe->color));
 427                 waddstr(bot.win, "\n");
 428                 waddstr(bot.win, rbe->msg);
 429         }
 430 out:
 431         wrefresh(bot.win);
 432 }
 433
 434 static void rb_add_entry(int color, char *msg)
 435 {
 436         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 437         int x, y;
 438         new->color = color;
 439         new->len = strlen(msg);
 440         new->msg = msg;
 441         old = ringbuffer_add(bot_win_rb, new);
 442 //      fprintf(stderr, "added: %s\n", new->msg);
 443         if (old) {
 444                 free(old->msg);
 445                 free(old);
 446         }
 447         if (scroll_position) {
 448                 /* discard current scrolling, like xterm does */
 449                 scroll_position = 0;
 450                 redraw_bot_win();
 451                 return;
 452         }
 453         wattron(bot.win, COLOR_PAIR(color));
 454         getyx(bot.win, y, x);
 455         if (y || x)
 456                 waddstr(bot.win, "\n");
 457         waddstr(bot.win, msg);
 458 }
 459
 460 /*
 461  * print formated output to bot win and refresh
 462  */
 463 __printf_2_3 static void outputf(int color, const char* fmt,...)
 464 {
 465         char *msg;
 466
 467         if (!curses_active)
 468                 return;
 469         PARA_VSPRINTF(fmt, msg);
 470         rb_add_entry(color, msg);
 471         wrefresh(bot.win);
 472 }
 473
 474 static int add_output_line(char *line, __a_unused void *data)
 475 {
 476         if (!curses_active)
 477                 return 1;
 478         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 479         return 1;
 480 }
 481
 482 static int loglevel;
 483
 484 __printf_2_3 void para_log(int ll, const char *fmt,...)
 485 {
 486         int color;
 487         char *msg;
 488
 489         if (ll < loglevel || !curses_active)
 490                 return;
 491         switch (ll) {
 492                 case LL_DEBUG:
 493                 case LL_INFO:
 494                 case LL_NOTICE:
 495                         color = COLOR_MSG;
 496                         break;
 497                 default:
 498                         color = COLOR_ERRMSG;
 499         }
 500         PARA_VSPRINTF(fmt, msg);
 501         chop(msg);
 502         rb_add_entry(color, msg);
 503         wrefresh(bot.win);
 504 }
 505
 506 static void setup_signal_handling(void)
 507 {
 508         signal_pipe = para_signal_init();
 509         para_install_sighandler(SIGINT);
 510         para_install_sighandler(SIGTERM);
 511         para_install_sighandler(SIGCHLD);
 512         para_install_sighandler(SIGWINCH);
 513         para_install_sighandler(SIGUSR1);
 514         para_sigaction(SIGHUP, SIG_IGN);
 515 }
 516
 517 __noreturn static void do_exit(int ret)
 518 {
 519         para_sigaction(SIGTERM, SIG_IGN);
 520         kill(0, SIGTERM);
 521         exit(ret);
 522 }
 523
 524 static void shutdown_curses(void)
 525 {
 526         if (!curses_active)
 527                 return;
 528         def_prog_mode();
 529         curses_active = 0;
 530         endwin();
 531 }
 532
 533 __noreturn static void finish(int ret)
 534 {
 535         shutdown_curses();
 536         do_exit(ret);
 537 }
 538
 539 /*
 540  * exit curses and print given message to stdout/stderr
 541  */
 542 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 543 {
 544         va_list argp;
 545         FILE *outfd = ret? stderr: stdout;
 546
 547         shutdown_curses();
 548         va_start(argp, fmt);
 549         vfprintf(outfd, fmt, argp);
 550         va_end(argp);
 551         do_exit(ret);
 552 }
 553
 554 static void print_welcome(void)
 555 {
 556         if (loglevel > LL_NOTICE)
 557                 return;
 558         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 559                 " \"" CODENAME "\". Theme: %s", theme.name);
 560         wclrtoeol(bot.win);
 561 }
 562
 563 /*
 564  * init all windows
 565  */
 566 static void init_wins(int top_lines)
 567 {
 568         int i;
 569
 570         top.lines = top_lines;
 571         top.cols = COLS;
 572         top.begy = 0;
 573         top.begx = 0;
 574
 575         bot.lines = LINES - top.lines - 3;
 576         bot.cols = COLS;
 577         bot.begy = top.lines + 1;
 578         bot.begx = 0;
 579
 580         sb.lines = 1;
 581         sb.cols = COLS;
 582         sb.begy = LINES - 2;
 583         sb.begx = 0;
 584
 585         in.lines = 1;
 586         in.cols = COLS;
 587         in.begy = LINES - 1;
 588         in.begx = 0;
 589
 590         sep.lines = 1;
 591         sep.cols = COLS;
 592         sep.begy = top.lines;
 593         sep.begx = 0;
 594
 595         assume_default_colors(theme.default_fg, theme.default_bg);
 596         if (top.win) {
 597                 mvwin(top.win, top.begy, top.begx);
 598                 wresize(top.win, top.lines, top.cols);
 599
 600                 mvwin(sb.win, sb.begy, sb.begx);
 601                 wresize(sb.win, sb.lines, sb.cols);
 602
 603                 mvwin(sep.win, sep.begy, sep.begx);
 604                 wresize(sep.win, sep.lines, sep.cols);
 605
 606                 mvwin(bot.win, bot.begy, bot.begx);
 607                 wresize(bot.win, bot.lines, bot.cols);
 608
 609                 mvwin(in.win, in.begy, in.begx);
 610                 wresize(in.win, in.lines, in.cols);
 611         } else {
 612                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 613                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 614                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 615                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 616                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 617                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 618                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 619                 wclear(bot.win);
 620                 wclear(sb.win);
 621                 wclear(in.win);
 622                 scrollok(bot.win, 1);
 623                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 624                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 625                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 626                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 627                 nodelay(top.win, 1);
 628                 nodelay(bot.win, 1);
 629                 nodelay(sb.win, 1);
 630                 nodelay(in.win, 0);
 631
 632                 keypad(top.win, 1);
 633                 keypad(bot.win, 1);
 634                 keypad(sb.win, 1);
 635                 keypad(in.win, 1);
 636                 print_status_bar();
 637         }
 638         wmove(sep.win, 0, 0);
 639         for (i = 1; i <= COLS; i++)
 640                 waddstr(sep.win, theme.sep_str);
 641         wclear(top.win);
 642         //wclear(bot.win);
 643         wnoutrefresh(top.win);
 644         wnoutrefresh(bot.win);
 645         //wnoutrefresh(sb.win);
 646         print_status_bar();
 647         wnoutrefresh(in.win);
 648         wnoutrefresh(sep.win);
 649         doupdate();
 650 }
 651
 652 static void check_geometry(void)
 653 {
 654         if (LINES < theme.lines_min || COLS < theme.cols_min)
 655                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 656                         " (need at least %dx%d)\n", COLS, LINES,
 657                         theme.cols_min, theme.lines_min);
 658 }
 659
 660 /*
 661  * Print stat item #i to curses window
 662  */
 663 static void print_stat_item(int i)
 664 {
 665         char *tmp;
 666         struct stat_item_data d = theme.data[i];
 667         char *c = stat_content[i];
 668
 669         if (!curses_active || !d.len || !c)
 670                 return;
 671         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 672         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 673         wrefresh(top.win);
 674         wattron(top.win, COLOR_PAIR(i + 1));
 675         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 676         free(tmp);
 677         wrefresh(top.win);
 678 }
 679
 680 static int update_item(int item_num, char *buf)
 681 {
 682         char **c = stat_content + item_num;
 683
 684         free(*c);
 685         if (buf && buf[0])
 686                 goto dup;
 687         switch (item_num) {
 688         case SI_ARTIST:
 689                 *c = para_strdup("(artist tag not set)");
 690                 goto print;
 691         case SI_TITLE:
 692                 *c = para_strdup("(title tag not set)");
 693                 goto print;
 694         case SI_YEAR:
 695                 *c = para_strdup("????");
 696                 goto print;
 697         case SI_ALBUM:
 698                 *c = para_strdup("(album tag not set)");
 699                 goto print;
 700         case SI_COMMENT:
 701                 *c = para_strdup("(comment tag not set)");
 702                 goto print;
 703         }
 704 dup:
 705         *c = para_strdup(buf);
 706 print:
 707         print_stat_item(item_num);
 708         return 1;
 709 }
 710
 711 static int read_audiod_pipe(int fd)
 712 {
 713         static char *buf;
 714         static int bufsize, loaded;
 715         int ret;
 716
 717         if (loaded >= bufsize) {
 718                 if (bufsize > 1000 * 1000) {
 719                         loaded = 0;
 720                         return 0;
 721                 }
 722                 bufsize += bufsize + 1000;
 723                 buf = para_realloc(buf, bufsize);
 724         }
 725         assert(loaded < bufsize);
 726         ret = read(fd, buf + loaded, bufsize - loaded);
 727         if (ret <= 0)
 728                 return ret;
 729         loaded += ret;
 730         ret = for_each_stat_item(buf, loaded, update_item);
 731         if (ret < 0)
 732                 return ret;
 733         if (ret > 0 && ret < loaded)
 734                 memmove(buf, buf + loaded - ret, ret);
 735         loaded = ret;
 736         return 1;
 737 }
 738
 739 static void print_all_items(void)
 740 {
 741         int i;
 742
 743         if (!curses_active)
 744                 return;
 745         FOR_EACH_STATUS_ITEM(i)
 746                 print_stat_item(i);
 747 }
 748
 749 static void clear_all_items(void)
 750 {
 751         int i;
 752
 753         FOR_EACH_STATUS_ITEM(i) {
 754                 free(stat_content[i]);
 755                 stat_content[i] = para_strdup("");
 756         }
 757 }
 758
 759 static void init_colors(void)
 760 {
 761         int i;
 762
 763         if (!has_colors())
 764                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 765         start_color();
 766         FOR_EACH_STATUS_ITEM(i)
 767                 if (theme.data[i].len)
 768                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 769         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 770         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 771         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 772         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 773         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 774         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 775         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 776         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 777         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 778 }
 779
 780 /*
 781  * (re-)initialize the curses library  FIXME: Error checking
 782  */
 783 static void init_curses(void)
 784 {
 785         curses_active = 1;
 786         if (top.win && refresh() == ERR) { /* refesh is really needed */
 787                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 788         }
 789         check_geometry();
 790         curs_set(0); /* make cursor invisible, ignore errors */
 791 //      if (noraw() == ERR);
 792 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 793 //                      "raw mode\n");
 794         nonl(); /* tell curses not to do NL->CR/NL on output */
 795         noecho(); /* don't echo input */
 796         cbreak(); /* take input chars one at a time, no wait for \n */
 797         //reset_prog_mode();
 798         init_colors();
 799         clear();
 800         init_wins(theme.top_lines_default);
 801         print_all_items();
 802         noecho(); /* don't echo input */
 803 }
 804
 805
 806 static void check_sigchld(void)
 807 {
 808         int ret;
 809         pid_t pid;
 810 reap_next_child:
 811         ret = para_reap_child(&pid);
 812         if (ret <= 0)
 813                 return;
 814         if (pid == cmd_pid) {
 815                 cmd_pid = 0;
 816                 cmd_died = 1;
 817         }
 818         goto reap_next_child;
 819 }
 820
 821 /*
 822  * This sucker modifies its first argument. *handler and *arg are
 823  * pointers to 0-terminated strings (inside line). Crap.
 824  */
 825 static int split_key_map(char *line, char **handler, char **arg)
 826 {
 827         if (!(*handler = strchr(line + 1, ':')))
 828                 goto err_out;
 829         **handler = '\0';
 830         (*handler)++;
 831         if (!(*arg = strchr(*handler, ':')))
 832                 goto err_out;
 833         **arg = '\0';
 834         (*arg)++;
 835         return 1;
 836 err_out:
 837         return 0;
 838 }
 839
 840 static int check_key_map_args(void)
 841 {
 842         char *s;
 843         int i, ret = -1;
 844         char *tmp = NULL, *handler, *arg;
 845
 846         for (i = 0; i < conf.key_map_given; ++i) {
 847                 s = conf.key_map_arg[i];
 848                 if (!(*s))
 849                         goto err_out;
 850                 free(tmp);
 851                 tmp = para_strdup(s);
 852                 if (!split_key_map(tmp, &handler, &arg))
 853                         goto err_out;
 854                 if (strlen(handler) != 1)
 855                         goto err_out;
 856                 if (*handler != 'x'
 857                         && *handler != 'd'
 858                         && *handler != 'i'
 859                         && *handler != 'p')
 860                         goto err_out;
 861                 if (*handler != 'i')
 862                         continue;
 863                 if (find_cmd_byname(arg) < 0)
 864                         goto err_out;
 865         }
 866         ret = 0;
 867 err_out:
 868         free(tmp);
 869         return ret;
 870 }
 871
 872 /*
 873  * React to various signal-related events
 874  */
 875 static void handle_signal(int sig)
 876 {
 877         switch (sig) {
 878         case SIGTERM:
 879                 msg_n_exit(EXIT_FAILURE,
 880                         "only the good die young (caught SIGTERM))\n");
 881                 return;
 882         case SIGWINCH:
 883                 if (curses_active) {
 884                         shutdown_curses();
 885                         init_curses();
 886                         redraw_bot_win();
 887                 }
 888                 return;
 889         case SIGINT:
 890                 PARA_WARNING_LOG("caught SIGINT, reset");
 891                 /* Nothing to do. SIGINT killed our child which gets noticed
 892                  * by do_select and resets everything.
 893                  */
 894                 return;
 895         case SIGUSR1:
 896                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 897                 com_reread_conf();
 898                 return;
 899         case SIGCHLD:
 900                 check_sigchld();
 901                 return;
 902         }
 903 }
 904
 905 static int open_audiod_pipe(void)
 906 {
 907         static int init = 1;
 908
 909         if (init)
 910                 init = 0;
 911         else
 912                 sleep(1);
 913         return para_open_audiod_pipe(conf.stat_cmd_arg);
 914 }
 915
 916 /*
 917  * This is the core select loop. Besides the (internal) signal
 918  * pipe, the following other fds are checked according to the mode:
 919  *
 920  * GETCH_MODE: check stdin, return when key is pressed
 921  *
 922  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 923  * of output has been read or when other end has closed command pipe or
 924  * when any key is pressed.
 925  *
 926  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 927  * is running. During that time curses is disabled.  Returns when
 928  * cmd_pid == 0.
 929  */
 930 static int do_select(int mode)
 931 {
 932         fd_set rfds;
 933         int ret;
 934         int max_fileno, cp_numread = 1;
 935         char command_buf[4096] = "";
 936         int cbo = 0; /* command buf offset */
 937         struct timeval tv;
 938 repeat:
 939         tv.tv_sec = conf.timeout_arg  / 1000;
 940         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 941 //      ret = refresh_status();
 942         FD_ZERO(&rfds);
 943         max_fileno = 0;
 944         /* audiod pipe */
 945         if (audiod_pipe < 0)
 946                 audiod_pipe = open_audiod_pipe();
 947         if (audiod_pipe >= 0)
 948                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 949         /* signal pipe */
 950         para_fd_set(signal_pipe, &rfds, &max_fileno);
 951         /* command pipe only for COMMAND_MODE */
 952         if (command_pipe >= 0 && mode == COMMAND_MODE)
 953                 para_fd_set(command_pipe, &rfds, &max_fileno);
 954         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 955         if (ret <= 0)
 956                 goto check_return; /* skip fd checks */
 957         /* signals */
 958         if (FD_ISSET(signal_pipe, &rfds)) {
 959                 int sig_nr = para_next_signal();
 960                 if (sig_nr > 0)
 961                         handle_signal(sig_nr);
 962         }
 963         /* read command pipe if ready */
 964         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 965                         FD_ISSET(command_pipe, &rfds)) {
 966                 cp_numread = read(command_pipe, command_buf + cbo,
 967                         sizeof(command_buf) - 1 - cbo);
 968                 if (cp_numread >= 0)
 969                         cbo += cp_numread;
 970                 else {
 971                         if (cp_numread < 0)
 972                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 973                         close(command_pipe);
 974                         command_pipe = -1;
 975                 }
 976         }
 977         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 978                 if (read_audiod_pipe(audiod_pipe) <= 0) {
 979                         close(audiod_pipe);
 980                         audiod_pipe = -1;
 981                         clear_all_items();
 982                         free(stat_content[SI_BASENAME]);
 983                         stat_content[SI_BASENAME] =
 984                                 para_strdup("audiod not running!?");
 985                         print_all_items();
 986                 }
 987 check_return:
 988         switch (mode) {
 989         case COMMAND_MODE:
 990                 if (cp_numread <= 0 && !cbo) /* command complete */
 991                         return 0;
 992                 if (cbo)
 993                         cbo = for_each_line(command_buf, cbo,
 994                                 &add_output_line, NULL);
 995                 if (cp_numread <= 0)
 996                         cbo = 0;
 997                 wrefresh(bot.win);
 998                 ret = wgetch(top.win);
 999                 if (ret != ERR && ret != KEY_RESIZE) {
1000                         if (command_pipe) {
1001                                 close(command_pipe);
1002                                 command_pipe = -1;
1003                         }
1004                         if (cmd_pid)
1005                                 kill(cmd_pid, SIGTERM);
1006                         return -1;
1007                 }
1008                 break;
1009         case GETCH_MODE:
1010                 ret = wgetch(top.win);
1011                 if (ret != ERR && ret != KEY_RESIZE)
1012                         return ret;
1013                 break;
1014         case EXTERNAL_MODE:
1015                 if (cmd_died) {
1016                         cmd_died = 0;
1017                         return 0;
1018                 }
1019         }
1020         goto repeat;
1021 }
1022
1023 /*
1024  * read from command pipe and print data to bot window
1025  */
1026 static int send_output(void)
1027 {
1028         int ret;
1029
1030         if (command_pipe < 0)
1031                 return 0;
1032         ret = mark_fd_nonblocking(command_pipe);
1033         if (ret < 0) {
1034                 close(command_pipe);
1035                 return ret;
1036         }
1037         if (do_select(COMMAND_MODE) >= 0)
1038                 PARA_INFO_LOG("command complete");
1039         else
1040                 PARA_NOTICE_LOG("command aborted");
1041         print_in_bar(COLOR_MSG, " ");
1042         return 1;
1043 }
1044
1045 static int client_cmd_cmdline(char *cmd)
1046 {
1047         int ret, fds[3] = {0, 1, 0};
1048         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1049
1050         outputf(COLOR_COMMAND, "%s", c);
1051         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1052         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1053         free(c);
1054         if (ret < 0)
1055                 return -1;
1056         command_pipe = fds[1];
1057         return send_output();
1058 }
1059
1060 /*
1061  * exec command and print output to bot win
1062  */
1063 static int display_cmd(char *cmd)
1064 {
1065         int fds[3] = {0, 1, 0};
1066
1067         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1068         outputf(COLOR_COMMAND, "%s", cmd);
1069         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1070                 return -1;
1071         command_pipe = fds[1];
1072         return send_output();
1073 }
1074
1075 /*
1076  * shutdown curses and stat pipe before executing external commands
1077  */
1078 static int external_cmd(char *cmd)
1079 {
1080         int fds[3] = {-1, -1, -1};
1081
1082         if (cmd_pid)
1083                 return -1;
1084         shutdown_curses();
1085         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1086         cmd_died = 0;
1087         do_select(EXTERNAL_MODE);
1088         init_curses();
1089         return 0;
1090 }
1091
1092 static void print_scroll_msg(void)
1093 {
1094         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1095         int first_rbe = first_visible_rbe(&lines_total);
1096         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1097                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1098 }
1099
1100 static void com_page_down(void)
1101 {
1102         unsigned lines = 0;
1103         int i = scroll_position;
1104         while (lines < bot.lines && --i > 0) {
1105                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1106                 if (!rbe)
1107                         break;
1108                 lines += NUM_LINES(strlen(rbe->msg));
1109         }
1110         if (lines) {
1111                 scroll_position = i;
1112                 redraw_bot_win();
1113                 print_scroll_msg();
1114                 return;
1115         }
1116         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1117 }
1118
1119 static void com_page_up(void)
1120 {
1121         unsigned lines;
1122         int fvr = first_visible_rbe(&lines);
1123
1124         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1125                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1126                 return;
1127         }
1128         scroll_position = fvr + 1;
1129         for (; scroll_position > 0; scroll_position--) {
1130                 first_visible_rbe(&lines);
1131                 if (lines == bot.lines)
1132                         break;
1133         }
1134         redraw_bot_win();
1135         print_scroll_msg();
1136 }
1137
1138 static void com_scroll_down(void)
1139 {
1140         struct rb_entry *rbe;
1141         int rbe_lines;
1142
1143         if (!scroll_position) {
1144                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1145                 return;
1146         }
1147         scroll_position--;
1148         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1149         rbe_lines = NUM_LINES(rbe->len);
1150         wscrl(bot.win, rbe_lines);
1151         wmove(bot.win, bot.lines - rbe_lines, 0);
1152         wattron(bot.win, COLOR_PAIR(rbe->color));
1153         waddstr(bot.win, rbe->msg);
1154         wrefresh(bot.win);
1155         print_scroll_msg();
1156 }
1157
1158 static void com_scroll_up(void)
1159 {
1160         struct rb_entry *rbe = NULL;
1161         unsigned lines;
1162         int i, first_rbe, num_scroll;
1163
1164         /* the entry that is going to vanish */
1165         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1166         if (!rbe)
1167                 goto err_out;
1168         num_scroll = NUM_LINES(rbe->len);
1169         first_rbe = first_visible_rbe(&lines);
1170         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1171                 goto err_out;
1172         scroll_position++;
1173         wscrl(bot.win, -num_scroll);
1174         i = draw_top_rbe(&lines);
1175         if (i < 0)
1176                 goto err_out;
1177         while (i > 0 && lines < num_scroll) {
1178                 int rbe_lines;
1179                 rbe = ringbuffer_get(bot_win_rb, --i);
1180                 if (!rbe)
1181                         break;
1182                 rbe_lines = NUM_LINES(rbe->len);
1183                 lines += rbe_lines;
1184 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1185                 wattron(bot.win, COLOR_PAIR(rbe->color));
1186                 waddstr(bot.win, "\n");
1187                 waddstr(bot.win, rbe->msg);
1188                 if (!i)
1189                         break;
1190                 i--;
1191         }
1192         wrefresh(bot.win);
1193         print_scroll_msg();
1194         return;
1195 err_out:
1196         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1197 }
1198
1199 static void com_ll_decr(void)
1200 {
1201         if (loglevel <= LL_DEBUG) {
1202                 print_in_bar(COLOR_ERRMSG,
1203                         "loglevel already at maximal verbosity\n");
1204                 return;
1205         }
1206         loglevel--;
1207         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1208 }
1209
1210 static void com_ll_incr(void)
1211 {
1212         if (loglevel >= LL_EMERG) {
1213                 print_in_bar(COLOR_ERRMSG,
1214                         "loglevel already at minimal verbosity\n");
1215                 return;
1216         }
1217         loglevel++;
1218         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1219 }
1220
1221 /*
1222  * reread configuration, terminate on errors
1223  */
1224 static void com_reread_conf(void)
1225 {
1226         char *cf =configfile_exists();
1227         struct gui_cmdline_parser_params params = {
1228                 .override = 1,
1229                 .initialize = 1,
1230                 .check_required = 0,
1231                 .check_ambiguity = 0
1232         };
1233
1234         if (!cf) {
1235                 PARA_WARNING_LOG("there is no configuration to read");
1236                 return;
1237         }
1238         PARA_INFO_LOG("rereading command line options and config file");
1239         gui_cmdline_parser(_argc, _argv, &conf);
1240         gui_cmdline_parser_config_file(cf, &conf, &params);
1241         PARA_NOTICE_LOG("config file reloaded");
1242         if (check_key_map_args() < 0)
1243                 finish(EXIT_FAILURE);
1244 }
1245
1246 static void com_help(void)
1247 {
1248         int i;
1249
1250         for (i = 0; i < conf.key_map_given; ++i) {
1251                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1252                 const char *handler_text = "???", *desc = NULL;
1253
1254                 if (!split_key_map(tmp, &handler, &arg)) {
1255                         free(tmp);
1256                         return;
1257                 }
1258                 switch (*handler) {
1259                         case 'i':
1260                                 handler_text = "internal";
1261                                 desc = command_list[find_cmd_byname(arg)].description;
1262                                 break;
1263                         case 'x': handler_text = "external"; break;
1264                         case 'd': handler_text = "display "; break;
1265                         case 'p': handler_text = "para    "; break;
1266                 }
1267                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1268                         strlen(arg) < 8? "\t" : "",
1269                         desc? desc : "");
1270                 free(tmp);
1271         }
1272         for (i = 0; command_list[i].handler; i++) {
1273                 struct gui_command gc = command_list[i];
1274
1275                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1276                         strlen(gc.name) < 8? "\t" : "",
1277                         gc.description);
1278         }
1279         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1280                 "for more info");
1281 }
1282
1283 static void com_shrink_top_win(void)
1284 {
1285         if (top.lines <= theme.top_lines_min) {
1286                 PARA_WARNING_LOG("can not decrease top window");
1287                 return;
1288         }
1289         init_wins(top.lines - 1);
1290         wclear(top.win);
1291         print_all_items();
1292         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1293 }
1294
1295 static void com_enlarge_top_win(void)
1296 {
1297         if (bot.lines < 3) {
1298                 PARA_WARNING_LOG("can not increase top window");
1299                 return;
1300         }
1301         init_wins(top.lines + 1);
1302         wclear(top.win);
1303         print_all_items();
1304         print_in_bar(COLOR_MSG, "increased top window");
1305 }
1306
1307 static void com_version(void)
1308 {
1309         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1310                 CODENAME "\"");
1311 }
1312
1313 __noreturn static void com_quit(void)
1314 {
1315         finish(0);
1316 }
1317
1318 static void com_refresh(void)
1319 {
1320         shutdown_curses();
1321         init_curses();
1322 }
1323
1324 static void change_theme(int next)
1325 {
1326         if (next)
1327                 next_theme(&theme);
1328         else
1329                 prev_theme(&theme);
1330         /* This seems to be needed twice, why? */
1331         com_refresh();
1332         com_refresh();
1333         PARA_NOTICE_LOG("new theme: %s", theme.name);
1334 }
1335
1336 static void com_next_theme(void)
1337 {
1338         change_theme(1);
1339 }
1340
1341 static void com_prev_theme(void)
1342 {
1343         change_theme(0);
1344 }
1345
1346
1347 static void handle_command(int c)
1348 {
1349         int i;
1350
1351         /* first check user's key bindings */
1352         for (i = 0; i < conf.key_map_given; ++i) {
1353                 char *tmp, *handler, *arg;
1354
1355                 tmp = para_strdup(conf.key_map_arg[i]);
1356                 if (!split_key_map(tmp, &handler, &arg)) {
1357                         free(tmp);
1358                         return;
1359                 }
1360                 if (strcmp(tmp, km_keyname(c))) {
1361                         free(tmp);
1362                         continue;
1363                 }
1364                 if (*handler == 'd')
1365                         display_cmd(arg);
1366                 else if (*handler == 'x')
1367                         external_cmd(arg);
1368                 else if (*handler == 'p')
1369                         client_cmd_cmdline(arg);
1370                 else if (*handler == 'i') {
1371                         int num = find_cmd_byname(arg);
1372                         if (num >= 0)
1373                                 command_list[num].handler();
1374                 }
1375                 free(tmp);
1376                 return;
1377         }
1378         /* not found, check internal key bindings */
1379         for (i = 0; command_list[i].handler; i++) {
1380                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1381                         command_list[i].handler();
1382                         return;
1383                 }
1384         }
1385         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1386                 km_keyname(c));
1387 }
1388
1389 int main(int argc, char *argv[])
1390 {
1391         int ret;
1392         char *cf;
1393
1394         _argc = argc;
1395         _argv = argv;
1396
1397         if (gui_cmdline_parser(argc, argv, &conf)) {
1398                 fprintf(stderr, "parse error while reading command line\n");
1399                 exit(EXIT_FAILURE);
1400         }
1401         HANDLE_VERSION_FLAG("gui", conf);
1402         init_theme(0, &theme);
1403         top.lines = theme.top_lines_default;
1404         if (check_key_map_args() < 0) {
1405                 fprintf(stderr, "invalid key map\n");
1406                 exit(EXIT_FAILURE);
1407         }
1408         cf = configfile_exists();
1409         if (!cf && conf.config_file_given) {
1410                 fprintf(stderr, "can not read config file %s\n",
1411                         conf.config_file_arg);
1412                 exit(EXIT_FAILURE);
1413         }
1414         if (cf) {
1415                 struct gui_cmdline_parser_params params = {
1416                         .override = 0,
1417                         .initialize = 0,
1418                         .check_required = 0,
1419                         .check_ambiguity = 0
1420                 };
1421                 gui_cmdline_parser_config_file(cf, &conf, &params);
1422         }
1423         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1424         if (check_key_map_args() < 0) {
1425                 fprintf(stderr, "invalid key map in config file\n");
1426                 exit(EXIT_FAILURE);
1427         }
1428         setup_signal_handling();
1429         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1430         initscr(); /* needed only once, always successful */
1431         init_curses();
1432         print_welcome();
1433         for (;;) {
1434                 print_status_bar();
1435                 ret = do_select(GETCH_MODE);
1436                 if (!ret)
1437                         continue;
1438                 print_in_bar(COLOR_MSG, " ");
1439                 handle_command(ret);
1440         }
1441 }