gui.c

   1 /*
   2  * Copyright (C) 1998-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c ncurses-based interface for paraslash */
   8
   9 #include <signal.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include "gui.cmdline.h"
  13 #include "para.h"
  14 #include "gui.h"
  15 #include <curses.h>
  16 #include "ringbuffer.h"
  17 #include "gui_common.h"
  18 #include "fd.h"
  19 #include "error.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "signal.h"
  23
  24 /** define the array of error lists needed by para_gui */
  25 INIT_GUI_ERRLISTS;
  26 extern const char *status_item_list[NUM_STAT_ITEMS];
  27 static char *stat_content[NUM_STAT_ITEMS];
  28
  29 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  30
  31 static int signal_pipe;
  32
  33 static void finish(int sig);
  34
  35 static struct win_data {
  36         WINDOW *win;
  37         NCURSES_SIZE_T begx;
  38         NCURSES_SIZE_T begy;
  39         NCURSES_SIZE_T cols;
  40         NCURSES_SIZE_T lines;
  41 } top, bot, sb, in, sep;
  42
  43 #define RINGBUFFER_SIZE 512
  44 struct rb_entry {
  45         char *msg;
  46         size_t len;
  47         int color;
  48 };
  49 void *bot_win_rb;
  50 #define NUM_LINES(len) (1 + (len) / bot.cols)
  51
  52 static unsigned scroll_position;
  53
  54 static int cmd_died, curses_active;
  55 static pid_t cmd_pid;
  56
  57 static int command_pipe = -1;
  58 static int audiod_pipe = -1;
  59 static struct gui_args_info conf;
  60
  61 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  62
  63
  64 #define COLOR_STATUSBAR 32
  65 #define COLOR_COMMAND 33
  66 #define COLOR_OUTPUT 34
  67 #define COLOR_MSG 35
  68 #define COLOR_ERRMSG 36
  69 #define COLOR_WELCOME 37
  70 #define COLOR_SEPARATOR 38
  71 #define COLOR_TOP 39
  72 #define COLOR_BOT 40
  73
  74 struct gui_command {
  75         const char *key;
  76         const char *name;
  77         const char *description;
  78         void (*handler)(void);
  79 };
  80
  81 struct stat_item {
  82         char name[MAXLINE];
  83         char prefix[MAXLINE];
  84         char postfix[MAXLINE];
  85         unsigned y;
  86         unsigned x;
  87         unsigned len;
  88         int fg, bg;
  89         int align;
  90         char content[MAXLINE];
  91 };
  92
  93 static struct gui_theme theme;
  94
  95 int _argc;
  96 char **_argv;
  97
  98 static void com_help(void);
  99 static void com_reread_conf(void);
 100 static void com_enlarge_top_win(void);
 101 static void com_shrink_top_win(void);
 102 static void com_version(void);
 103 static void com_quit(void);
 104 static void com_refresh(void);
 105 static void com_ll_incr(void);
 106 static void com_ll_decr(void);
 107 static void com_prev_theme(void);
 108 static void com_next_theme(void);
 109 static void com_scroll_up(void);
 110 static void com_scroll_down(void);
 111 static void com_page_up(void);
 112 static void com_page_down(void);
 113
 114 struct gui_command command_list[] = {
 115         {
 116                 .key = "?",
 117                 .name = "help",
 118                 .description = "print help",
 119                 .handler = com_help
 120         }, {
 121                 .key = "+",
 122                 .name = "enlarge_win",
 123                 .description = "enlarge the top window",
 124                 .handler = com_enlarge_top_win
 125         }, {
 126                 .key = "-",
 127                 .name = "shrink_win",
 128                 .description = "shrink the top window",
 129                 .handler = com_shrink_top_win
 130         }, {
 131                 .key = "r",
 132                 .name = "reread_conf",
 133                 .description = "reread configuration file",
 134                 .handler = com_reread_conf
 135         }, {
 136                 .key = "q",
 137                 .name = "quit",
 138                 .description = "exit para_gui",
 139                 .handler = com_quit
 140         }, {
 141                 .key = "^L",
 142                 .name = "refresh",
 143                 .description = "redraw the screen",
 144                 .handler = com_refresh
 145         }, {
 146                 .key = ".",
 147                 .name = "next_theme",
 148                 .description = "switch to next theme",
 149                 .handler = com_next_theme
 150         }, {
 151                 .key = ",",
 152                 .name = "prev_theme",
 153                 .description = "switch to previous stream",
 154                 .handler = com_prev_theme
 155         }, {
 156                 .key = ">",
 157                 .name = "ll_incr",
 158                 .description = "increase loglevel (decreases verbosity)",
 159                 .handler = com_ll_incr
 160         }, {
 161                 .key = "<",
 162                 .name = "ll_decr",
 163                 .description = "decrease loglevel (increases verbosity)",
 164                 .handler = com_ll_decr
 165         }, {
 166                 .key = "V",
 167                 .name = "version",
 168                 .description = "show the para_gui version",
 169                 .handler = com_version
 170         }, {
 171                 .key = "<up>",
 172                 .name = "scroll_up",
 173                 .description = "scroll up one line",
 174                 .handler = com_scroll_up
 175         }, {
 176                 .key = "<down>",
 177                 .name = "scroll_down",
 178                 .description = "scroll down one line",
 179                 .handler = com_scroll_down
 180         }, {
 181                 .key = "<ppage>",
 182                 .name = "page_up",
 183                 .description = "scroll up one page",
 184                 .handler = com_page_up
 185         }, {
 186                 .key = "<npage>",
 187                 .name = "page_down",
 188                 .description = "scroll down one page",
 189                 .handler = com_page_down
 190         }, {
 191                 .handler = NULL
 192         }
 193 };
 194
 195 static int find_cmd_byname(char *name)
 196 {
 197         int i;
 198
 199         for (i = 0; command_list[i].handler; i++)
 200                 if (!strcmp(command_list[i].name, name))
 201                         return i;
 202         return -1;
 203 }
 204
 205 /* taken from mutt */
 206 static char *km_keyname(int c)
 207 {
 208         static char buf[10];
 209
 210         if (c == KEY_UP) {
 211                 sprintf(buf, "<up>");
 212                 return buf;
 213         }
 214         if (c == KEY_DOWN) {
 215                 sprintf(buf, "<down>");
 216                 return buf;
 217         }
 218         if (c == KEY_LEFT) {
 219                 sprintf(buf, "<left>");
 220                 return buf;
 221         }
 222         if (c == KEY_RIGHT) {
 223                 sprintf(buf, "<right>");
 224                 return buf;
 225         }
 226         if (c == KEY_NPAGE) {
 227                 sprintf(buf, "<npage>");
 228                 return buf;
 229         }
 230         if (c == KEY_PPAGE) {
 231                 sprintf(buf, "<ppage>");
 232                 return buf;
 233         }
 234         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 235                 if (c < 0)
 236                         c += 256;
 237                 if (c < 128) {
 238                         buf[0] = '^';
 239                         buf[1] = (c + '@') & 0x7f;
 240                         buf[2] = 0;
 241                 } else
 242                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 243                                 (c >> 3) & 7, c & 7);
 244         } else if (c >= KEY_F0 && c < KEY_F(256))
 245                 sprintf(buf, "<F%d>", c - KEY_F0);
 246         else if (isprint(c))
 247                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 248         else
 249                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 250         return buf;
 251 }
 252
 253 static char *configfile_exists(void)
 254 {
 255         static char *config_file;
 256         char *tmp;
 257
 258         if (!conf.config_file_given) {
 259                 if (!config_file) {
 260                         char *home = para_homedir();
 261                         config_file = make_message("%s/.paraslash/gui.conf",
 262                                 home);
 263                         free(home);
 264                 }
 265                 tmp = config_file;
 266         } else
 267                 tmp = conf.config_file_arg;
 268         return file_exists(tmp)? tmp: NULL;
 269 }
 270
 271 /*
 272  * print num spaces to curses window
 273  */
 274 static void add_spaces(WINDOW* win, unsigned int num)
 275 {
 276         while (num > 0) {
 277                 num--;
 278                 waddstr(win, " ");
 279         }
 280 }
 281
 282 /*
 283  * print aligned string to curses window. This function always prints
 284  * exactly len chars.
 285  */
 286 static int align_str(WINDOW* win, const char *string, unsigned int len,
 287                 unsigned int align)
 288 {
 289         int num; /* of spaces */
 290         char *str;
 291
 292         if (!win || !string)
 293                 return -1;
 294         num = len - strlen(string);
 295         str = para_strdup(string);
 296         if (num < 0) {
 297                 str[len] = '\0';
 298                 num = 0;
 299         }
 300         if (align == LEFT) {
 301                 waddstr(win, str);
 302                 add_spaces(win, num);
 303         } else if (align == RIGHT) {
 304                 add_spaces(win, num);
 305                 waddstr(win, str);
 306         } else {
 307                 add_spaces(win, num / 2);
 308                 waddstr(win, str[0]? str: "");
 309                 add_spaces(win, num - num / 2);
 310         }
 311         free(str);
 312         return 1;
 313 }
 314
 315 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 316 {
 317         char *msg;
 318
 319         if (!curses_active)
 320                 return;
 321         wattron(in.win, COLOR_PAIR(color));
 322         PARA_VSPRINTF(fmt, msg);
 323         wmove(in.win, 0, 0);
 324         align_str(in.win, msg, sb.cols, LEFT);
 325         free(msg);
 326         wrefresh(in.win);
 327 }
 328
 329 /*
 330  * update the status bar
 331  */
 332 static void print_status_bar(void)
 333 {
 334         if (!curses_active)
 335                 return;
 336         wmove(sb.win, 0, 0);
 337         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 338         wrefresh(sb.win);
 339 }
 340
 341 /*
 342  * get the number of the oldest rbe that is (partially) visible. On return,
 343  * lines contains the sum of the number of lines of all visable entries. If the
 344  * first one is only partially visible, lines is greater than bot.lines.
 345  */
 346 static int first_visible_rbe(unsigned *lines)
 347 {
 348         int i;
 349         *lines = 0;
 350         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 351                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 352                 int rbe_lines;
 353                 if (!rbe)
 354                         return i - 1;
 355 //              fprintf(stderr, "found: %s\n", rbe->msg);
 356                 rbe_lines = NUM_LINES(rbe->len);
 357                 if (rbe_lines > bot.lines)
 358                         return -1;
 359                 *lines += rbe_lines;
 360                 if (*lines >= bot.lines)
 361                         return i;
 362         }
 363         return RINGBUFFER_SIZE - 1;
 364 }
 365
 366 static int draw_top_rbe(unsigned *lines)
 367 {
 368         unsigned len;
 369         int offset, fvr = first_visible_rbe(lines);
 370         struct rb_entry *rbe;
 371
 372         if (fvr < 0)
 373                 return -1;
 374         wmove(bot.win, 0, 0);
 375         rbe = ringbuffer_get(bot_win_rb, fvr);
 376         if (!rbe)
 377                 return -1;
 378         /* first rbe might be only partially visible */
 379         offset = (*lines - bot.lines) * bot.cols;
 380         len = strlen(rbe->msg);
 381         if (offset < 0 || len < offset)
 382                 return -1;
 383         wattron(bot.win, COLOR_PAIR(rbe->color));
 384         waddstr(bot.win, rbe->msg + offset);
 385         *lines = NUM_LINES(len - offset);
 386         return fvr;
 387 }
 388
 389 static void redraw_bot_win(void)
 390 {
 391         unsigned lines;
 392         int i;
 393
 394         wmove(bot.win, 0, 0);
 395         wclear(bot.win);
 396         i = draw_top_rbe(&lines);
 397         if (i <= 0)
 398                 goto out;
 399         while (i > 0 && lines < bot.lines) {
 400                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 401                 if (!rbe) {
 402                         lines++;
 403                         waddstr(bot.win, "\n");
 404                         continue;
 405                 }
 406                 lines += NUM_LINES(rbe->len);
 407                 wattron(bot.win, COLOR_PAIR(rbe->color));
 408                 waddstr(bot.win, "\n");
 409                 waddstr(bot.win, rbe->msg);
 410         }
 411 out:
 412         wrefresh(bot.win);
 413 }
 414
 415 static void rb_add_entry(int color, char *msg)
 416 {
 417         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 418         int x, y;
 419         new->color = color;
 420         new->len = strlen(msg);
 421         new->msg = msg;
 422         old = ringbuffer_add(bot_win_rb, new);
 423 //      fprintf(stderr, "added: %s\n", new->msg);
 424         if (old) {
 425                 free(old->msg);
 426                 free(old);
 427         }
 428         if (scroll_position) {
 429                 /* discard current scrolling, like xterm does */
 430                 scroll_position = 0;
 431                 redraw_bot_win();
 432                 return;
 433         }
 434         wattron(bot.win, COLOR_PAIR(color));
 435         getyx(bot.win, y, x);
 436         if (y || x)
 437                 waddstr(bot.win, "\n");
 438         waddstr(bot.win, msg);
 439 }
 440
 441 /*
 442  * print formated output to bot win and refresh
 443  */
 444 __printf_2_3 static void outputf(int color, const char* fmt,...)
 445 {
 446         char *msg;
 447
 448         if (!curses_active)
 449                 return;
 450         PARA_VSPRINTF(fmt, msg);
 451         rb_add_entry(color, msg);
 452         wrefresh(bot.win);
 453 }
 454
 455 static int add_output_line(char *line, __a_unused void *data)
 456 {
 457         if (!curses_active)
 458                 return 1;
 459         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 460         return 1;
 461 }
 462
 463 void para_log(int ll, const char *fmt,...)
 464 {
 465         int color;
 466         char *msg;
 467
 468         if (ll < conf.loglevel_arg || !curses_active)
 469                 return;
 470         switch (ll) {
 471                 case DEBUG:
 472                 case INFO:
 473                 case NOTICE:
 474                         color = COLOR_MSG;
 475                         break;
 476                 default:
 477                         color = COLOR_ERRMSG;
 478         }
 479         PARA_VSPRINTF(fmt, msg);
 480         chop(msg);
 481         rb_add_entry(color, msg);
 482         wrefresh(bot.win);
 483 }
 484
 485 static void setup_signal_handling(void)
 486 {
 487         signal_pipe = para_signal_init();
 488         para_install_sighandler(SIGINT);
 489         para_install_sighandler(SIGTERM);
 490         para_install_sighandler(SIGCHLD);
 491         para_install_sighandler(SIGWINCH);
 492         para_install_sighandler(SIGUSR1);
 493         signal(SIGPIPE, SIG_IGN);
 494         signal(SIGHUP, SIG_IGN);
 495 }
 496
 497 static void do_exit(int ret)
 498 {
 499         signal(SIGTERM, SIG_IGN);
 500         kill(0, SIGTERM);
 501         exit(ret);
 502 }
 503
 504 static void shutdown_curses(void)
 505 {
 506         if (!curses_active)
 507                 return;
 508         def_prog_mode();
 509         curses_active = 0;
 510         endwin();
 511 }
 512
 513 static void finish(int ret)
 514 {
 515         shutdown_curses();
 516         do_exit(ret);
 517 }
 518
 519 /*
 520  * exit curses and print given message to stdout/stderr
 521  */
 522 __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 523 {
 524         va_list argp;
 525         FILE *outfd = ret? stderr: stdout;
 526
 527         shutdown_curses();
 528         va_start(argp, fmt);
 529         vfprintf(outfd, fmt, argp);
 530         va_end(argp);
 531         do_exit(ret);
 532 }
 533
 534 static void print_welcome(void)
 535 {
 536         int ll = conf.loglevel_arg;
 537         if (ll > NOTICE)
 538                 return;
 539         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 540                 " \"" CODENAME "\". Theme: %s", theme.name);
 541         wclrtoeol(bot.win);
 542 }
 543
 544 /*
 545  * init all windows
 546  */
 547 static void init_wins(int top_lines)
 548 {
 549         int i;
 550
 551         top.lines = top_lines;
 552         top.cols = COLS;
 553         top.begy = 0;
 554         top.begx = 0;
 555
 556         bot.lines = LINES - top.lines - 3;
 557         bot.cols = COLS;
 558         bot.begy = top.lines + 1;
 559         bot.begx = 0;
 560
 561         sb.lines = 1;
 562         sb.cols = COLS;
 563         sb.begy = LINES - 2;
 564         sb.begx = 0;
 565
 566         in.lines = 1;
 567         in.cols = COLS;
 568         in.begy = LINES - 1;
 569         in.begx = 0;
 570
 571         sep.lines = 1;
 572         sep.cols = COLS;
 573         sep.begy = top.lines;
 574         sep.begx = 0;
 575
 576         assume_default_colors(theme.default_fg, theme.default_bg);
 577         if (top.win) {
 578                 mvwin(top.win, top.begy, top.begx);
 579                 wresize(top.win, top.lines, top.cols);
 580
 581                 mvwin(sb.win, sb.begy, sb.begx);
 582                 wresize(sb.win, sb.lines, sb.cols);
 583
 584                 mvwin(sep.win, sep.begy, sep.begx);
 585                 wresize(sep.win, sep.lines, sep.cols);
 586
 587                 mvwin(bot.win, bot.begy, bot.begx);
 588                 wresize(bot.win, bot.lines, bot.cols);
 589
 590                 mvwin(in.win, in.begy, in.begx);
 591                 wresize(in.win, in.lines, in.cols);
 592         } else {
 593                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 594                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 595                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 596                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 597                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 598                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 599                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 600                 wclear(bot.win);
 601                 wclear(sb.win);
 602                 wclear(in.win);
 603                 scrollok(bot.win, 1);
 604                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 605                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 606                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 607                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 608                 nodelay(top.win, 1);
 609                 nodelay(bot.win, 1);
 610                 nodelay(sb.win, 1);
 611                 nodelay(in.win, 0);
 612
 613                 keypad(top.win, 1);
 614                 keypad(bot.win, 1);
 615                 keypad(sb.win, 1);
 616                 keypad(in.win, 1);
 617                 print_status_bar();
 618         }
 619         wmove(sep.win, 0, 0);
 620         for (i = 1; i <= COLS; i++)
 621                 waddstr(sep.win, theme.sep_str);
 622         wclear(top.win);
 623         //wclear(bot.win);
 624         wnoutrefresh(top.win);
 625         wnoutrefresh(bot.win);
 626         //wnoutrefresh(sb.win);
 627         print_status_bar();
 628         wnoutrefresh(in.win);
 629         wnoutrefresh(sep.win);
 630         doupdate();
 631 }
 632
 633 static void check_geometry(void)
 634 {
 635         if (LINES < theme.lines_min || COLS < theme.cols_min)
 636                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 637                         " (need at least %dx%d)\n", COLS, LINES,
 638                         theme.cols_min, theme.lines_min);
 639 }
 640
 641 /*
 642  * Print stat item #i to curses window
 643  */
 644 static void print_stat_item(int i)
 645 {
 646         char *tmp;
 647         struct stat_item_data d = theme.data[i];
 648         char *c = stat_content[i];
 649
 650         if (!curses_active || !d.len || !c)
 651                 return;
 652         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 653 //      PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
 654         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 655         wrefresh(top.win);
 656         wattron(top.win, COLOR_PAIR(i + 1));
 657         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 658         free(tmp);
 659         wrefresh(top.win);
 660 }
 661
 662 static void print_all_items(void)
 663 {
 664         int i;
 665
 666         if (!curses_active)
 667                 return;
 668         for (i = 0; i < NUM_STAT_ITEMS; i++)
 669                 print_stat_item(i);
 670 }
 671 static void clear_all_items(void)
 672 {
 673         int i;
 674
 675         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 676                 free(stat_content[i]);
 677                 stat_content[i] = para_strdup("");
 678         }
 679 }
 680
 681 static void init_colors(void)
 682 {
 683         int i;
 684         if (!has_colors())
 685                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 686         start_color();
 687         for (i = 0; i < NUM_STAT_ITEMS; i++)
 688                 if (theme.data[i].len)
 689                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 690         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 691         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 692         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 693         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 694         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 695         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 696         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 697         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 698         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 699 }
 700
 701 /*
 702  * (re-)initialize the curses library  FIXME: Error checking
 703  */
 704 static void init_curses(void)
 705 {
 706         curses_active = 1;
 707         if (top.win && refresh() == ERR) { /* refesh is really needed */
 708                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 709         }
 710         check_geometry();
 711         curs_set(0); /* make cursor invisible, ignore errors */
 712 //      if (noraw() == ERR);
 713 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 714 //                      "raw mode\n");
 715         nonl(); /* tell curses not to do NL->CR/NL on output */
 716         noecho(); /* don't echo input */
 717         cbreak(); /* take input chars one at a time, no wait for \n */
 718         //reset_prog_mode();
 719         init_colors();
 720         clear();
 721         init_wins(theme.top_lines_default);
 722         print_all_items();
 723         noecho(); /* don't echo input */
 724 }
 725
 726
 727 static void check_sigchld(void)
 728 {
 729         pid_t pid;
 730 reap_next_child:
 731         pid = para_reap_child();
 732         if (pid <= 0)
 733                 return;
 734         if (pid == cmd_pid) {
 735                 cmd_pid = 0;
 736                 cmd_died = 1;
 737         }
 738         goto reap_next_child;
 739 }
 740
 741 /*
 742  * print status line if line starts with known command.
 743  */
 744 static int check_stat_line(char *line, __a_unused void *data)
 745 {
 746         int i;
 747
 748 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 749         i = stat_line_valid(line);
 750         if (i >= 0) {
 751                 line += strlen(status_item_list[i]) + 1;
 752                 free(stat_content[i]);
 753                 stat_content[i] = para_strdup(line);
 754                 print_stat_item(i);
 755         }
 756         return 1;
 757 }
 758
 759 /*
 760  * This sucker modifies its first argument. *handler and *arg are
 761  * pointers to 0-terminated strings (inside line). Crap.
 762  */
 763 static int split_key_map(char *line, char **handler, char **arg)
 764 {
 765         if (!(*handler = strchr(line + 1, ':')))
 766                 goto err_out;
 767         **handler = '\0';
 768         (*handler)++;
 769         if (!(*arg = strchr(*handler, ':')))
 770                 goto err_out;
 771         **arg = '\0';
 772         (*arg)++;
 773         return 1;
 774 err_out:
 775         return 0;
 776 }
 777
 778 static int check_key_map_args(void)
 779 {
 780         char *s;
 781         int i, ret = -1;
 782         char *tmp = NULL, *handler, *arg;
 783
 784         for (i = 0; i < conf.key_map_given; ++i) {
 785                 s = conf.key_map_arg[i];
 786                 if (!(*s))
 787                         goto err_out;
 788                 free(tmp);
 789                 tmp = para_strdup(s);
 790                 if (!split_key_map(tmp, &handler, &arg))
 791                         goto err_out;
 792                 if (strlen(handler) != 1)
 793                         goto err_out;
 794                 if (*handler != 'x'
 795                         && *handler != 'd'
 796                         && *handler != 'i'
 797                         && *handler != 'p')
 798                         goto err_out;
 799                 if (*handler != 'i')
 800                         continue;
 801                 if (find_cmd_byname(arg) < 0)
 802                         goto err_out;
 803         }
 804         ret = 0;
 805 err_out:
 806         free(tmp);
 807         return ret;
 808 }
 809
 810 /*
 811  * React to various signal-related events
 812  */
 813 static void handle_signal(int sig)
 814 {
 815         switch (sig) {
 816         case SIGTERM:
 817                 msg_n_exit(EXIT_FAILURE,
 818                         "only the good die young (caught SIGTERM))\n");
 819                 return;
 820         case SIGWINCH:
 821                 if (curses_active) {
 822                         shutdown_curses();
 823                         init_curses();
 824                         redraw_bot_win();
 825                 }
 826                 return;
 827         case SIGINT:
 828                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 829                 /* Nothing to do. SIGINT killed our child, para_client stat.
 830                  * This get noticed by do_select which resets everything
 831                  */
 832                 return;
 833         case SIGUSR1:
 834                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 835                 com_reread_conf();
 836                 return;
 837         case SIGCHLD:
 838                 check_sigchld();
 839                 return;
 840         }
 841 }
 842
 843 static int open_audiod_pipe(void)
 844 {
 845         static int init = 1;
 846
 847         if (init)
 848                 init = 0;
 849         else
 850                 sleep(1);
 851         return para_open_audiod_pipe(conf.stat_cmd_arg);
 852 }
 853
 854 /*
 855  * This is the core select loop. Besides the (internal) signal
 856  * pipe, the following other fds are checked according to the mode:
 857  *
 858  * GETCH_MODE: check stdin, return when key is pressed
 859  *
 860  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 861  * of output has been read or when other end has closed command pipe or
 862  * when any key is pressed.
 863  *
 864  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 865  * is running. During that thime curses is disabled.  Returns when
 866  * cmd_pid == 0.
 867  */
 868 static int do_select(int mode)
 869 {
 870         fd_set rfds;
 871         int ret;
 872         int max_fileno, cp_numread = 1;
 873         char command_buf[4096] = "";
 874         int cbo = 0; /* command buf offset */
 875         struct timeval tv;
 876 repeat:
 877         tv.tv_sec = conf.timeout_arg  / 1000;
 878         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 879 //      ret = refresh_status();
 880         FD_ZERO(&rfds);
 881         max_fileno = 0;
 882         /* audiod pipe */
 883         if (audiod_pipe < 0)
 884                 audiod_pipe = open_audiod_pipe();
 885         if (audiod_pipe >= 0)
 886                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 887         /* signal pipe */
 888         para_fd_set(signal_pipe, &rfds, &max_fileno);
 889         /* command pipe only for COMMAND_MODE */
 890         if (command_pipe >= 0 && mode == COMMAND_MODE)
 891                 para_fd_set(command_pipe, &rfds, &max_fileno);
 892         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 893         if (ret <= 0)
 894                 goto check_return; /* skip fd checks */
 895         /* signals */
 896         if (FD_ISSET(signal_pipe, &rfds)) {
 897                 int sig_nr = para_next_signal();
 898                 if (sig_nr > 0)
 899                         handle_signal(sig_nr);
 900         }
 901         /* read command pipe if ready */
 902         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 903                         FD_ISSET(command_pipe, &rfds)) {
 904                 cp_numread = read(command_pipe, command_buf + cbo,
 905                         sizeof(command_buf) - 1 - cbo);
 906                 if (cp_numread >= 0)
 907                         cbo += cp_numread;
 908                 else {
 909                         if (cp_numread < 0)
 910                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 911                         close(command_pipe);
 912                         command_pipe = -1;
 913                 }
 914         }
 915         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 916                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 917                         close(audiod_pipe);
 918                         audiod_pipe = -1;
 919                         clear_all_items();
 920                         free(stat_content[SI_STATUS_BAR]);
 921                         stat_content[SI_STATUS_BAR] =
 922                                 para_strdup("audiod not running!?");
 923                         print_all_items();
 924                 }
 925 check_return:
 926         switch (mode) {
 927         case COMMAND_MODE:
 928                 if (cp_numread <= 0 && !cbo) /* command complete */
 929                         return 0;
 930                 if (cbo)
 931                         cbo = for_each_line(command_buf, cbo,
 932                                 &add_output_line, NULL);
 933                 if (cp_numread <= 0)
 934                         cbo = 0;
 935                 wrefresh(bot.win);
 936                 ret = wgetch(top.win);
 937                 if (ret != ERR && ret != KEY_RESIZE) {
 938                         if (command_pipe) {
 939                                 close(command_pipe);
 940                                 command_pipe = -1;
 941                         }
 942                         if (cmd_pid)
 943                                 kill(cmd_pid, SIGTERM);
 944                         return -1;
 945                 }
 946                 break;
 947         case GETCH_MODE:
 948                 ret = wgetch(top.win);
 949                 if (ret != ERR && ret != KEY_RESIZE)
 950                         return ret;
 951                 break;
 952         case EXTERNAL_MODE:
 953                 if (cmd_died) {
 954                         cmd_died = 0;
 955                         return 0;
 956                 }
 957         }
 958         goto repeat;
 959 }
 960
 961 /*
 962  * read from command pipe and print data to bot window
 963  */
 964 static int send_output(void)
 965 {
 966         if (command_pipe < 0)
 967                 return 0;
 968         if (do_select(COMMAND_MODE) >= 0)
 969                 PARA_INFO_LOG("%s", "command complete");
 970         else
 971                 PARA_NOTICE_LOG("%s", "command aborted");
 972         print_in_bar(COLOR_MSG, " ");
 973         return 1;
 974 }
 975
 976 static int client_cmd_cmdline(char *cmd)
 977 {
 978         int ret, fds[3] = {0, 1, 0};
 979         char *c = make_message(BINDIR "/para_client %s", cmd);
 980
 981         outputf(COLOR_COMMAND, "%s", c);
 982         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
 983         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
 984         free(c);
 985         if (ret < 0)
 986                 return -1;
 987         command_pipe = fds[1];
 988         mark_fd_nonblock(command_pipe);
 989         return send_output();
 990 }
 991
 992 /*
 993  * exec command and print output to bot win
 994  */
 995 static int display_cmd(char *cmd)
 996 {
 997         int fds[3] = {0, 1, 0};
 998
 999         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1000         outputf(COLOR_COMMAND, "%s", cmd);
1001         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1002                 return -1;
1003         command_pipe = fds[1];
1004         mark_fd_nonblock(command_pipe);
1005         return send_output();
1006 }
1007
1008 /*
1009  * shutdown curses and stat pipe before executing external commands
1010  */
1011 static int external_cmd(char *cmd)
1012 {
1013         int fds[3] = {-1, -1, -1};
1014
1015         if (cmd_pid)
1016                 return -1;
1017         shutdown_curses();
1018         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1019         cmd_died = 0;
1020         do_select(EXTERNAL_MODE);
1021         init_curses();
1022         return 0;
1023 }
1024
1025 static void print_scroll_msg(void)
1026 {
1027         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1028         int first_rbe = first_visible_rbe(&lines_total);
1029         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1030                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1031 }
1032
1033 static void com_page_down(void)
1034 {
1035         unsigned lines = 0;
1036         int i = scroll_position;
1037         while (lines < bot.lines && --i > 0) {
1038                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1039                 if (!rbe)
1040                         break;
1041                 lines += NUM_LINES(strlen(rbe->msg));
1042         }
1043         if (lines) {
1044                 scroll_position = i;
1045                 redraw_bot_win();
1046                 print_scroll_msg();
1047                 return;
1048         }
1049         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1050 }
1051
1052 static void com_page_up(void)
1053 {
1054         unsigned lines;
1055         int fvr = first_visible_rbe(&lines);
1056         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1057                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1058                 return;
1059         }
1060         scroll_position = fvr + 1;
1061         for (; scroll_position > 0; scroll_position--) {
1062                 fvr = first_visible_rbe(&lines);
1063                 if (lines == bot.lines)
1064                         break;
1065         }
1066         redraw_bot_win();
1067         print_scroll_msg();
1068 }
1069
1070 static void com_scroll_down(void)
1071 {
1072         struct rb_entry *rbe;
1073         int rbe_lines;
1074
1075         if (!scroll_position) {
1076                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1077                 return;
1078         }
1079         scroll_position--;
1080         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1081         rbe_lines = NUM_LINES(rbe->len);
1082         wscrl(bot.win, rbe_lines);
1083         wmove(bot.win, bot.lines - rbe_lines, 0);
1084         wattron(bot.win, COLOR_PAIR(rbe->color));
1085         waddstr(bot.win, rbe->msg);
1086         wrefresh(bot.win);
1087         print_scroll_msg();
1088 }
1089
1090 static void com_scroll_up(void)
1091 {
1092         struct rb_entry *rbe = NULL;
1093         unsigned lines;
1094         int i, first_rbe, num_scroll;
1095
1096         /* the entry that is going to vanish */
1097         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1098         if (!rbe)
1099                 goto err_out;
1100         num_scroll = NUM_LINES(rbe->len);
1101         first_rbe = first_visible_rbe(&lines);
1102         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1103                 goto err_out;
1104         scroll_position++;
1105         wscrl(bot.win, -num_scroll);
1106         i = draw_top_rbe(&lines);
1107         if (i < 0)
1108                 goto err_out;
1109         while (i > 0 && lines < num_scroll) {
1110                 int rbe_lines;
1111                 rbe = ringbuffer_get(bot_win_rb, --i);
1112                 if (!rbe)
1113                         break;
1114                 rbe_lines = NUM_LINES(rbe->len);
1115                 lines += rbe_lines;
1116 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1117                 wattron(bot.win, COLOR_PAIR(rbe->color));
1118                 waddstr(bot.win, "\n");
1119                 waddstr(bot.win, rbe->msg);
1120                 if (!i)
1121                         break;
1122                 i--;
1123         }
1124         wrefresh(bot.win);
1125         print_scroll_msg();
1126         return;
1127 err_out:
1128         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1129 }
1130
1131 static void com_ll_decr(void)
1132 {
1133         if (conf.loglevel_arg <= DEBUG) {
1134                 print_in_bar(COLOR_ERRMSG,
1135                         "loglevel already at maximal verbosity\n");
1136                 return;
1137         }
1138         conf.loglevel_arg--;
1139         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1140 }
1141
1142 static void com_ll_incr(void)
1143 {
1144         if (conf.loglevel_arg >= EMERG) {
1145                 print_in_bar(COLOR_ERRMSG,
1146                         "loglevel already at miminal verbosity\n");
1147                 return;
1148         }
1149         conf.loglevel_arg++;
1150         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1151 }
1152
1153 /*
1154  * reread configuration, terminate on errors
1155  */
1156 static void com_reread_conf(void)
1157 {
1158         char *cf =configfile_exists();
1159         struct gui_cmdline_parser_params params = {
1160                 .override = 1,
1161                 .initialize = 1,
1162                 .check_required = 0,
1163                 .check_ambiguity = 0
1164         };
1165
1166         if (!cf) {
1167                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1168                 return;
1169         }
1170         PARA_INFO_LOG("%s", "rereading command line options and config file");
1171         gui_cmdline_parser(_argc, _argv, &conf);
1172         gui_cmdline_parser_config_file(cf, &conf, &params);
1173         PARA_NOTICE_LOG("%s", "config file reloaded");
1174         if (check_key_map_args() < 0)
1175                 finish(EXIT_FAILURE);
1176 }
1177
1178 static void com_help(void)
1179 {
1180         int i;
1181
1182         for (i = 0; i < conf.key_map_given; ++i) {
1183                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1184                 const char *handler_text = "???", *desc = NULL;
1185
1186                 if (!split_key_map(tmp, &handler, &arg)) {
1187                         free(tmp);
1188                         return;
1189                 }
1190                 switch (*handler) {
1191                         case 'i':
1192                                 handler_text = "internal";
1193                                 desc = command_list[find_cmd_byname(arg)].description;
1194                                 break;
1195                         case 'x': handler_text = "external"; break;
1196                         case 'd': handler_text = "display "; break;
1197                         case 'p': handler_text = "para    "; break;
1198                 }
1199                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1200                         strlen(arg) < 8? "\t" : "",
1201                         desc? desc : "");
1202                 free(tmp);
1203         }
1204         for (i = 0; command_list[i].handler; i++) {
1205                 struct gui_command gc = command_list[i];
1206
1207                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1208                         strlen(gc.name) < 8? "\t" : "",
1209                         gc.description);
1210         }
1211         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1212                 "for more info");
1213 }
1214
1215 static void com_shrink_top_win(void)
1216 {
1217         if (top.lines <= theme.top_lines_min) {
1218                 PARA_WARNING_LOG("%s", "can not decrease top window");
1219                 return;
1220         }
1221         init_wins(top.lines - 1);
1222         wclear(top.win);
1223         print_all_items();
1224         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1225 }
1226
1227 static void com_enlarge_top_win(void)
1228 {
1229         if (bot.lines < 3) {
1230                 PARA_WARNING_LOG("%s", "can not increase top window");
1231                 return;
1232         }
1233         init_wins(top.lines + 1);
1234         wclear(top.win);
1235         print_all_items();
1236         print_in_bar(COLOR_MSG, "increased top window");
1237 }
1238
1239 static void com_version(void)
1240 {
1241         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1242                 CODENAME "\"");
1243 }
1244
1245 static void com_quit(void)
1246 {
1247         finish(0);
1248 }
1249
1250 static void com_refresh(void)
1251 {
1252         shutdown_curses();
1253         init_curses();
1254 }
1255
1256 static void change_theme(int next)
1257 {
1258         if (next)
1259                 next_theme(&theme);
1260         else
1261                 prev_theme(&theme);
1262         /* This seems to be needed twice, why? */
1263         com_refresh();
1264         com_refresh();
1265         PARA_NOTICE_LOG("new theme: %s", theme.name);
1266 }
1267
1268 static void com_next_theme(void)
1269 {
1270         change_theme(1);
1271 }
1272
1273 static void com_prev_theme(void)
1274 {
1275         change_theme(0);
1276 }
1277
1278
1279 static void handle_command(int c)
1280 {
1281         int i;
1282
1283         /* first check user's key bindings */
1284         for (i = 0; i < conf.key_map_given; ++i) {
1285                 char tmp[MAXLINE], *handler, *arg;
1286
1287                 strcpy(tmp, conf.key_map_arg[i]);
1288                 if (!split_key_map(tmp, &handler, &arg))
1289                         return;
1290                 if (!strcmp(tmp, km_keyname(c))) {
1291                         if (*handler == 'd') {
1292                                 display_cmd(arg);
1293                                 return;
1294                         }
1295                         if (*handler == 'x') {
1296                                 external_cmd(arg);
1297                                 return;
1298                         }
1299                         if (*handler == 'p') {
1300                                 client_cmd_cmdline(arg);
1301                                 return;
1302                         }
1303                         if (*handler == 'i') {
1304                                 int num = find_cmd_byname(arg);
1305                                 if (num >= 0)
1306                                         command_list[num].handler();
1307                                 return;
1308                         }
1309                 }
1310         }
1311         /* not found, check internal key bindings */
1312         for (i = 0; command_list[i].handler; i++) {
1313                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1314                         command_list[i].handler();
1315                         return;
1316                 }
1317         }
1318         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1319                 km_keyname(c));
1320 }
1321
1322 int main(int argc, char *argv[])
1323 {
1324         int ret;
1325         char *cf;
1326
1327         _argc = argc;
1328         _argv = argv;
1329
1330         if (gui_cmdline_parser(argc, argv, &conf)) {
1331                 fprintf(stderr, "parse error while reading command line\n");
1332                 exit(EXIT_FAILURE);
1333         }
1334         HANDLE_VERSION_FLAG("gui", conf);
1335         init_theme(0, &theme);
1336         top.lines = theme.top_lines_default;
1337         if (check_key_map_args() < 0) {
1338                 fprintf(stderr, "invalid key map\n");
1339                 exit(EXIT_FAILURE);
1340         }
1341         cf = configfile_exists();
1342         if (!cf && conf.config_file_given) {
1343                 fprintf(stderr, "can not read config file %s\n",
1344                         conf.config_file_arg);
1345                 exit(EXIT_FAILURE);
1346         }
1347         if (cf) {
1348                 struct gui_cmdline_parser_params params = {
1349                         .override = 0,
1350                         .initialize = 0,
1351                         .check_required = 0,
1352                         .check_ambiguity = 0
1353                 };
1354                 gui_cmdline_parser_config_file(cf, &conf, &params);
1355         }
1356         if (check_key_map_args() < 0) {
1357                 fprintf(stderr, "invalid key map in config file\n");
1358                 exit(EXIT_FAILURE);
1359         }
1360         setup_signal_handling();
1361         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1362         initscr(); /* needed only once, always successful */
1363         init_curses();
1364         print_welcome();
1365         for (;;) {
1366                 print_status_bar();
1367                 ret = do_select(GETCH_MODE);
1368                 if (!ret)
1369                         continue;
1370                 print_in_bar(COLOR_MSG, " ");
1371                 handle_command(ret);
1372         }
1373 }