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