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