gui.c

   1 /*
   2  * Copyright (C) 1998-2009 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         loaded = ret;
 734         return 1;
 735 }
 736
 737 static void print_all_items(void)
 738 {
 739         int i;
 740
 741         if (!curses_active)
 742                 return;
 743         FOR_EACH_STATUS_ITEM(i)
 744                 print_stat_item(i);
 745 }
 746
 747 static void clear_all_items(void)
 748 {
 749         int i;
 750
 751         FOR_EACH_STATUS_ITEM(i) {
 752                 free(stat_content[i]);
 753                 stat_content[i] = para_strdup("");
 754         }
 755 }
 756
 757 static void init_colors(void)
 758 {
 759         int i;
 760
 761         if (!has_colors())
 762                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 763         start_color();
 764         FOR_EACH_STATUS_ITEM(i)
 765                 if (theme.data[i].len)
 766                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 767         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 768         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 769         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 770         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 771         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 772         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 773         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 774         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 775         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 776 }
 777
 778 /*
 779  * (re-)initialize the curses library  FIXME: Error checking
 780  */
 781 static void init_curses(void)
 782 {
 783         curses_active = 1;
 784         if (top.win && refresh() == ERR) { /* refesh is really needed */
 785                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 786         }
 787         check_geometry();
 788         curs_set(0); /* make cursor invisible, ignore errors */
 789 //      if (noraw() == ERR);
 790 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 791 //                      "raw mode\n");
 792         nonl(); /* tell curses not to do NL->CR/NL on output */
 793         noecho(); /* don't echo input */
 794         cbreak(); /* take input chars one at a time, no wait for \n */
 795         //reset_prog_mode();
 796         init_colors();
 797         clear();
 798         init_wins(theme.top_lines_default);
 799         print_all_items();
 800         noecho(); /* don't echo input */
 801 }
 802
 803
 804 static void check_sigchld(void)
 805 {
 806         int ret;
 807         pid_t pid;
 808 reap_next_child:
 809         ret = para_reap_child(&pid);
 810         if (ret <= 0)
 811                 return;
 812         if (pid == cmd_pid) {
 813                 cmd_pid = 0;
 814                 cmd_died = 1;
 815         }
 816         goto reap_next_child;
 817 }
 818
 819 /*
 820  * This sucker modifies its first argument. *handler and *arg are
 821  * pointers to 0-terminated strings (inside line). Crap.
 822  */
 823 static int split_key_map(char *line, char **handler, char **arg)
 824 {
 825         if (!(*handler = strchr(line + 1, ':')))
 826                 goto err_out;
 827         **handler = '\0';
 828         (*handler)++;
 829         if (!(*arg = strchr(*handler, ':')))
 830                 goto err_out;
 831         **arg = '\0';
 832         (*arg)++;
 833         return 1;
 834 err_out:
 835         return 0;
 836 }
 837
 838 static int check_key_map_args(void)
 839 {
 840         char *s;
 841         int i, ret = -1;
 842         char *tmp = NULL, *handler, *arg;
 843
 844         for (i = 0; i < conf.key_map_given; ++i) {
 845                 s = conf.key_map_arg[i];
 846                 if (!(*s))
 847                         goto err_out;
 848                 free(tmp);
 849                 tmp = para_strdup(s);
 850                 if (!split_key_map(tmp, &handler, &arg))
 851                         goto err_out;
 852                 if (strlen(handler) != 1)
 853                         goto err_out;
 854                 if (*handler != 'x'
 855                         && *handler != 'd'
 856                         && *handler != 'i'
 857                         && *handler != 'p')
 858                         goto err_out;
 859                 if (*handler != 'i')
 860                         continue;
 861                 if (find_cmd_byname(arg) < 0)
 862                         goto err_out;
 863         }
 864         ret = 0;
 865 err_out:
 866         free(tmp);
 867         return ret;
 868 }
 869
 870 /*
 871  * React to various signal-related events
 872  */
 873 static void handle_signal(int sig)
 874 {
 875         switch (sig) {
 876         case SIGTERM:
 877                 msg_n_exit(EXIT_FAILURE,
 878                         "only the good die young (caught SIGTERM))\n");
 879                 return;
 880         case SIGWINCH:
 881                 if (curses_active) {
 882                         shutdown_curses();
 883                         init_curses();
 884                         redraw_bot_win();
 885                 }
 886                 return;
 887         case SIGINT:
 888                 PARA_WARNING_LOG("caught SIGINT, reset");
 889                 /* Nothing to do. SIGINT killed our child which gets noticed
 890                  * by do_select and resets everything.
 891                  */
 892                 return;
 893         case SIGUSR1:
 894                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 895                 com_reread_conf();
 896                 return;
 897         case SIGCHLD:
 898                 check_sigchld();
 899                 return;
 900         }
 901 }
 902
 903 static int open_audiod_pipe(void)
 904 {
 905         static int init = 1;
 906
 907         if (init)
 908                 init = 0;
 909         else
 910                 sleep(1);
 911         return para_open_audiod_pipe(conf.stat_cmd_arg);
 912 }
 913
 914 /*
 915  * This is the core select loop. Besides the (internal) signal
 916  * pipe, the following other fds are checked according to the mode:
 917  *
 918  * GETCH_MODE: check stdin, return when key is pressed
 919  *
 920  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 921  * of output has been read or when other end has closed command pipe or
 922  * when any key is pressed.
 923  *
 924  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 925  * is running. During that time curses is disabled.  Returns when
 926  * cmd_pid == 0.
 927  */
 928 static int do_select(int mode)
 929 {
 930         fd_set rfds;
 931         int ret;
 932         int max_fileno, cp_numread = 1;
 933         char command_buf[4096] = "";
 934         int cbo = 0; /* command buf offset */
 935         struct timeval tv;
 936 repeat:
 937         tv.tv_sec = conf.timeout_arg  / 1000;
 938         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 939 //      ret = refresh_status();
 940         FD_ZERO(&rfds);
 941         max_fileno = 0;
 942         /* audiod pipe */
 943         if (audiod_pipe < 0)
 944                 audiod_pipe = open_audiod_pipe();
 945         if (audiod_pipe >= 0)
 946                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 947         /* signal pipe */
 948         para_fd_set(signal_pipe, &rfds, &max_fileno);
 949         /* command pipe only for COMMAND_MODE */
 950         if (command_pipe >= 0 && mode == COMMAND_MODE)
 951                 para_fd_set(command_pipe, &rfds, &max_fileno);
 952         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 953         if (ret <= 0)
 954                 goto check_return; /* skip fd checks */
 955         /* signals */
 956         if (FD_ISSET(signal_pipe, &rfds)) {
 957                 int sig_nr = para_next_signal();
 958                 if (sig_nr > 0)
 959                         handle_signal(sig_nr);
 960         }
 961         /* read command pipe if ready */
 962         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 963                         FD_ISSET(command_pipe, &rfds)) {
 964                 cp_numread = read(command_pipe, command_buf + cbo,
 965                         sizeof(command_buf) - 1 - cbo);
 966                 if (cp_numread >= 0)
 967                         cbo += cp_numread;
 968                 else {
 969                         if (cp_numread < 0)
 970                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 971                         close(command_pipe);
 972                         command_pipe = -1;
 973                 }
 974         }
 975         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 976                 if (read_audiod_pipe(audiod_pipe) <= 0) {
 977                         close(audiod_pipe);
 978                         audiod_pipe = -1;
 979                         clear_all_items();
 980                         free(stat_content[SI_BASENAME]);
 981                         stat_content[SI_BASENAME] =
 982                                 para_strdup("audiod not running!?");
 983                         print_all_items();
 984                 }
 985 check_return:
 986         switch (mode) {
 987         case COMMAND_MODE:
 988                 if (cp_numread <= 0 && !cbo) /* command complete */
 989                         return 0;
 990                 if (cbo)
 991                         cbo = for_each_line(command_buf, cbo,
 992                                 &add_output_line, NULL);
 993                 if (cp_numread <= 0)
 994                         cbo = 0;
 995                 wrefresh(bot.win);
 996                 ret = wgetch(top.win);
 997                 if (ret != ERR && ret != KEY_RESIZE) {
 998                         if (command_pipe) {
 999                                 close(command_pipe);
1000                                 command_pipe = -1;
1001                         }
1002                         if (cmd_pid)
1003                                 kill(cmd_pid, SIGTERM);
1004                         return -1;
1005                 }
1006                 break;
1007         case GETCH_MODE:
1008                 ret = wgetch(top.win);
1009                 if (ret != ERR && ret != KEY_RESIZE)
1010                         return ret;
1011                 break;
1012         case EXTERNAL_MODE:
1013                 if (cmd_died) {
1014                         cmd_died = 0;
1015                         return 0;
1016                 }
1017         }
1018         goto repeat;
1019 }
1020
1021 /*
1022  * read from command pipe and print data to bot window
1023  */
1024 static int send_output(void)
1025 {
1026         int ret;
1027
1028         if (command_pipe < 0)
1029                 return 0;
1030         ret = mark_fd_nonblocking(command_pipe);
1031         if (ret < 0) {
1032                 close(command_pipe);
1033                 return ret;
1034         }
1035         if (do_select(COMMAND_MODE) >= 0)
1036                 PARA_INFO_LOG("command complete");
1037         else
1038                 PARA_NOTICE_LOG("command aborted");
1039         print_in_bar(COLOR_MSG, " ");
1040         return 1;
1041 }
1042
1043 static int client_cmd_cmdline(char *cmd)
1044 {
1045         int ret, fds[3] = {0, 1, 0};
1046         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1047
1048         outputf(COLOR_COMMAND, "%s", c);
1049         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1050         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1051         free(c);
1052         if (ret < 0)
1053                 return -1;
1054         command_pipe = fds[1];
1055         return send_output();
1056 }
1057
1058 /*
1059  * exec command and print output to bot win
1060  */
1061 static int display_cmd(char *cmd)
1062 {
1063         int fds[3] = {0, 1, 0};
1064
1065         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1066         outputf(COLOR_COMMAND, "%s", cmd);
1067         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1068                 return -1;
1069         command_pipe = fds[1];
1070         return send_output();
1071 }
1072
1073 /*
1074  * shutdown curses and stat pipe before executing external commands
1075  */
1076 static int external_cmd(char *cmd)
1077 {
1078         int fds[3] = {-1, -1, -1};
1079
1080         if (cmd_pid)
1081                 return -1;
1082         shutdown_curses();
1083         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1084         cmd_died = 0;
1085         do_select(EXTERNAL_MODE);
1086         init_curses();
1087         return 0;
1088 }
1089
1090 static void print_scroll_msg(void)
1091 {
1092         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1093         int first_rbe = first_visible_rbe(&lines_total);
1094         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1095                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1096 }
1097
1098 static void com_page_down(void)
1099 {
1100         unsigned lines = 0;
1101         int i = scroll_position;
1102         while (lines < bot.lines && --i > 0) {
1103                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1104                 if (!rbe)
1105                         break;
1106                 lines += NUM_LINES(strlen(rbe->msg));
1107         }
1108         if (lines) {
1109                 scroll_position = i;
1110                 redraw_bot_win();
1111                 print_scroll_msg();
1112                 return;
1113         }
1114         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1115 }
1116
1117 static void com_page_up(void)
1118 {
1119         unsigned lines;
1120         int fvr = first_visible_rbe(&lines);
1121
1122         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1123                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1124                 return;
1125         }
1126         scroll_position = fvr + 1;
1127         for (; scroll_position > 0; scroll_position--) {
1128                 first_visible_rbe(&lines);
1129                 if (lines == bot.lines)
1130                         break;
1131         }
1132         redraw_bot_win();
1133         print_scroll_msg();
1134 }
1135
1136 static void com_scroll_down(void)
1137 {
1138         struct rb_entry *rbe;
1139         int rbe_lines;
1140
1141         if (!scroll_position) {
1142                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1143                 return;
1144         }
1145         scroll_position--;
1146         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1147         rbe_lines = NUM_LINES(rbe->len);
1148         wscrl(bot.win, rbe_lines);
1149         wmove(bot.win, bot.lines - rbe_lines, 0);
1150         wattron(bot.win, COLOR_PAIR(rbe->color));
1151         waddstr(bot.win, rbe->msg);
1152         wrefresh(bot.win);
1153         print_scroll_msg();
1154 }
1155
1156 static void com_scroll_up(void)
1157 {
1158         struct rb_entry *rbe = NULL;
1159         unsigned lines;
1160         int i, first_rbe, num_scroll;
1161
1162         /* the entry that is going to vanish */
1163         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1164         if (!rbe)
1165                 goto err_out;
1166         num_scroll = NUM_LINES(rbe->len);
1167         first_rbe = first_visible_rbe(&lines);
1168         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1169                 goto err_out;
1170         scroll_position++;
1171         wscrl(bot.win, -num_scroll);
1172         i = draw_top_rbe(&lines);
1173         if (i < 0)
1174                 goto err_out;
1175         while (i > 0 && lines < num_scroll) {
1176                 int rbe_lines;
1177                 rbe = ringbuffer_get(bot_win_rb, --i);
1178                 if (!rbe)
1179                         break;
1180                 rbe_lines = NUM_LINES(rbe->len);
1181                 lines += rbe_lines;
1182 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1183                 wattron(bot.win, COLOR_PAIR(rbe->color));
1184                 waddstr(bot.win, "\n");
1185                 waddstr(bot.win, rbe->msg);
1186                 if (!i)
1187                         break;
1188                 i--;
1189         }
1190         wrefresh(bot.win);
1191         print_scroll_msg();
1192         return;
1193 err_out:
1194         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1195 }
1196
1197 static void com_ll_decr(void)
1198 {
1199         if (loglevel <= LL_DEBUG) {
1200                 print_in_bar(COLOR_ERRMSG,
1201                         "loglevel already at maximal verbosity\n");
1202                 return;
1203         }
1204         loglevel--;
1205         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1206 }
1207
1208 static void com_ll_incr(void)
1209 {
1210         if (loglevel >= LL_EMERG) {
1211                 print_in_bar(COLOR_ERRMSG,
1212                         "loglevel already at minimal verbosity\n");
1213                 return;
1214         }
1215         loglevel++;
1216         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1217 }
1218
1219 /*
1220  * reread configuration, terminate on errors
1221  */
1222 static void com_reread_conf(void)
1223 {
1224         char *cf =configfile_exists();
1225         struct gui_cmdline_parser_params params = {
1226                 .override = 1,
1227                 .initialize = 1,
1228                 .check_required = 0,
1229                 .check_ambiguity = 0
1230         };
1231
1232         if (!cf) {
1233                 PARA_WARNING_LOG("there is no configuration to read");
1234                 return;
1235         }
1236         PARA_INFO_LOG("rereading command line options and config file");
1237         gui_cmdline_parser(_argc, _argv, &conf);
1238         gui_cmdline_parser_config_file(cf, &conf, &params);
1239         PARA_NOTICE_LOG("config file reloaded");
1240         if (check_key_map_args() < 0)
1241                 finish(EXIT_FAILURE);
1242 }
1243
1244 static void com_help(void)
1245 {
1246         int i;
1247
1248         for (i = 0; i < conf.key_map_given; ++i) {
1249                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1250                 const char *handler_text = "???", *desc = NULL;
1251
1252                 if (!split_key_map(tmp, &handler, &arg)) {
1253                         free(tmp);
1254                         return;
1255                 }
1256                 switch (*handler) {
1257                         case 'i':
1258                                 handler_text = "internal";
1259                                 desc = command_list[find_cmd_byname(arg)].description;
1260                                 break;
1261                         case 'x': handler_text = "external"; break;
1262                         case 'd': handler_text = "display "; break;
1263                         case 'p': handler_text = "para    "; break;
1264                 }
1265                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1266                         strlen(arg) < 8? "\t" : "",
1267                         desc? desc : "");
1268                 free(tmp);
1269         }
1270         for (i = 0; command_list[i].handler; i++) {
1271                 struct gui_command gc = command_list[i];
1272
1273                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1274                         strlen(gc.name) < 8? "\t" : "",
1275                         gc.description);
1276         }
1277         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1278                 "for more info");
1279 }
1280
1281 static void com_shrink_top_win(void)
1282 {
1283         if (top.lines <= theme.top_lines_min) {
1284                 PARA_WARNING_LOG("can not decrease top window");
1285                 return;
1286         }
1287         init_wins(top.lines - 1);
1288         wclear(top.win);
1289         print_all_items();
1290         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1291 }
1292
1293 static void com_enlarge_top_win(void)
1294 {
1295         if (bot.lines < 3) {
1296                 PARA_WARNING_LOG("can not increase top window");
1297                 return;
1298         }
1299         init_wins(top.lines + 1);
1300         wclear(top.win);
1301         print_all_items();
1302         print_in_bar(COLOR_MSG, "increased top window");
1303 }
1304
1305 static void com_version(void)
1306 {
1307         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1308                 CODENAME "\"");
1309 }
1310
1311 __noreturn static void com_quit(void)
1312 {
1313         finish(0);
1314 }
1315
1316 static void com_refresh(void)
1317 {
1318         shutdown_curses();
1319         init_curses();
1320 }
1321
1322 static void change_theme(int next)
1323 {
1324         if (next)
1325                 next_theme(&theme);
1326         else
1327                 prev_theme(&theme);
1328         /* This seems to be needed twice, why? */
1329         com_refresh();
1330         com_refresh();
1331         PARA_NOTICE_LOG("new theme: %s", theme.name);
1332 }
1333
1334 static void com_next_theme(void)
1335 {
1336         change_theme(1);
1337 }
1338
1339 static void com_prev_theme(void)
1340 {
1341         change_theme(0);
1342 }
1343
1344
1345 static void handle_command(int c)
1346 {
1347         int i;
1348
1349         /* first check user's key bindings */
1350         for (i = 0; i < conf.key_map_given; ++i) {
1351                 char tmp[MAXLINE], *handler, *arg;
1352
1353                 strcpy(tmp, conf.key_map_arg[i]);
1354                 if (!split_key_map(tmp, &handler, &arg))
1355                         return;
1356                 if (!strcmp(tmp, km_keyname(c))) {
1357                         if (*handler == 'd') {
1358                                 display_cmd(arg);
1359                                 return;
1360                         }
1361                         if (*handler == 'x') {
1362                                 external_cmd(arg);
1363                                 return;
1364                         }
1365                         if (*handler == 'p') {
1366                                 client_cmd_cmdline(arg);
1367                                 return;
1368                         }
1369                         if (*handler == 'i') {
1370                                 int num = find_cmd_byname(arg);
1371                                 if (num >= 0)
1372                                         command_list[num].handler();
1373                                 return;
1374                         }
1375                 }
1376         }
1377         /* not found, check internal key bindings */
1378         for (i = 0; command_list[i].handler; i++) {
1379                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1380                         command_list[i].handler();
1381                         return;
1382                 }
1383         }
1384         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1385                 km_keyname(c));
1386 }
1387
1388 int main(int argc, char *argv[])
1389 {
1390         int ret;
1391         char *cf;
1392
1393         _argc = argc;
1394         _argv = argv;
1395
1396         if (gui_cmdline_parser(argc, argv, &conf)) {
1397                 fprintf(stderr, "parse error while reading command line\n");
1398                 exit(EXIT_FAILURE);
1399         }
1400         HANDLE_VERSION_FLAG("gui", conf);
1401         init_theme(0, &theme);
1402         top.lines = theme.top_lines_default;
1403         if (check_key_map_args() < 0) {
1404                 fprintf(stderr, "invalid key map\n");
1405                 exit(EXIT_FAILURE);
1406         }
1407         cf = configfile_exists();
1408         if (!cf && conf.config_file_given) {
1409                 fprintf(stderr, "can not read config file %s\n",
1410                         conf.config_file_arg);
1411                 exit(EXIT_FAILURE);
1412         }
1413         if (cf) {
1414                 struct gui_cmdline_parser_params params = {
1415                         .override = 0,
1416                         .initialize = 0,
1417                         .check_required = 0,
1418                         .check_ambiguity = 0
1419                 };
1420                 gui_cmdline_parser_config_file(cf, &conf, &params);
1421         }
1422         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1423         if (check_key_map_args() < 0) {
1424                 fprintf(stderr, "invalid key map in config file\n");
1425                 exit(EXIT_FAILURE);
1426         }
1427         setup_signal_handling();
1428         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1429         initscr(); /* needed only once, always successful */
1430         init_curses();
1431         print_welcome();
1432         for (;;) {
1433                 print_status_bar();
1434                 ret = do_select(GETCH_MODE);
1435                 if (!ret)
1436                         continue;
1437                 print_in_bar(COLOR_MSG, " ");
1438                 handle_command(ret);
1439         }
1440 }