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