gui.c

   1 /*
   2  * Copyright (C) 1998-2010 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c Curses-based interface for paraslash. */
   8
   9 #include <regex.h>
  10 #include <signal.h>
  11 #include <sys/types.h>
  12 #include <dirent.h>
  13 #include <curses.h>
  14
  15 #include "gui.cmdline.h"
  16 #include "para.h"
  17 #include "gui.h"
  18 #include "string.h"
  19 #include "ringbuffer.h"
  20 #include "fd.h"
  21 #include "error.h"
  22 #include "list.h"
  23 #include "sched.h"
  24 #include "signal.h"
  25
  26 /** define the array of error lists needed by para_gui */
  27 INIT_GUI_ERRLISTS;
  28 static char *stat_content[NUM_STAT_ITEMS];
  29
  30 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  31
  32 static int signal_pipe;
  33
  34 static struct win_data {
  35         WINDOW *win;
  36         NCURSES_SIZE_T begx;
  37         NCURSES_SIZE_T begy;
  38         NCURSES_SIZE_T cols;
  39         NCURSES_SIZE_T lines;
  40 } top, bot, sb, in, sep;
  41
  42 #define RINGBUFFER_SIZE 512
  43 struct rb_entry {
  44         char *msg;
  45         size_t len;
  46         int color;
  47 };
  48 static struct ringbuffer *bot_win_rb;
  49 #define NUM_LINES(len) (1 + (len) / bot.cols)
  50
  51 static unsigned scroll_position;
  52
  53 static int cmd_died, curses_active;
  54 static pid_t cmd_pid;
  55
  56 static int command_pipe = -1;
  57 static int stat_pipe = -1;
  58 static struct gui_args_info conf;
  59
  60 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  61
  62
  63 #define COLOR_STATUSBAR 52
  64 #define COLOR_COMMAND 53
  65 #define COLOR_OUTPUT 54
  66 #define COLOR_MSG 55
  67 #define COLOR_ERRMSG 56
  68 #define COLOR_WELCOME 57
  69 #define COLOR_SEPARATOR 58
  70 #define COLOR_TOP 59
  71 #define COLOR_BOT 60
  72
  73 struct gui_command {
  74         const char *key;
  75         const char *name;
  76         const char *description;
  77         void (*handler)(void);
  78 };
  79
  80 struct stat_item {
  81         char name[MAXLINE];
  82         char prefix[MAXLINE];
  83         char postfix[MAXLINE];
  84         unsigned y;
  85         unsigned x;
  86         unsigned len;
  87         int fg, bg;
  88         int align;
  89         char content[MAXLINE];
  90 };
  91
  92 static struct gui_theme theme;
  93
  94 static int _argc;
  95 static char **_argv;
  96
  97 static void com_help(void);
  98 static void com_reread_conf(void);
  99 static void com_enlarge_top_win(void);
 100 static void com_shrink_top_win(void);
 101 static void com_version(void);
 102 static void com_quit(void);
 103 static void com_refresh(void);
 104 static void com_ll_incr(void);
 105 static void com_ll_decr(void);
 106 static void com_prev_theme(void);
 107 static void com_next_theme(void);
 108 static void com_scroll_up(void);
 109 static void com_scroll_down(void);
 110 static void com_page_up(void);
 111 static void com_page_down(void);
 112
 113 static struct gui_command command_list[] = {
 114         {
 115                 .key = "?",
 116                 .name = "help",
 117                 .description = "print help",
 118                 .handler = com_help
 119         }, {
 120                 .key = "+",
 121                 .name = "enlarge_win",
 122                 .description = "enlarge the top window",
 123                 .handler = com_enlarge_top_win
 124         }, {
 125                 .key = "-",
 126                 .name = "shrink_win",
 127                 .description = "shrink the top window",
 128                 .handler = com_shrink_top_win
 129         }, {
 130                 .key = "r",
 131                 .name = "reread_conf",
 132                 .description = "reread configuration file",
 133                 .handler = com_reread_conf
 134         }, {
 135                 .key = "q",
 136                 .name = "quit",
 137                 .description = "exit para_gui",
 138                 .handler = com_quit
 139         }, {
 140                 .key = "^L",
 141                 .name = "refresh",
 142                 .description = "redraw the screen",
 143                 .handler = com_refresh
 144         }, {
 145                 .key = ".",
 146                 .name = "next_theme",
 147                 .description = "switch to next theme",
 148                 .handler = com_next_theme
 149         }, {
 150                 .key = ",",
 151                 .name = "prev_theme",
 152                 .description = "switch to previous stream",
 153                 .handler = com_prev_theme
 154         }, {
 155                 .key = ">",
 156                 .name = "ll_incr",
 157                 .description = "increase loglevel (decreases verbosity)",
 158                 .handler = com_ll_incr
 159         }, {
 160                 .key = "<",
 161                 .name = "ll_decr",
 162                 .description = "decrease loglevel (increases verbosity)",
 163                 .handler = com_ll_decr
 164         }, {
 165                 .key = "V",
 166                 .name = "version",
 167                 .description = "show the para_gui version",
 168                 .handler = com_version
 169         }, {
 170                 .key = "<up>",
 171                 .name = "scroll_up",
 172                 .description = "scroll up one line",
 173                 .handler = com_scroll_up
 174         }, {
 175                 .key = "<down>",
 176                 .name = "scroll_down",
 177                 .description = "scroll down one line",
 178                 .handler = com_scroll_down
 179         }, {
 180                 .key = "<ppage>",
 181                 .name = "page_up",
 182                 .description = "scroll up one page",
 183                 .handler = com_page_up
 184         }, {
 185                 .key = "<npage>",
 186                 .name = "page_down",
 187                 .description = "scroll down one page",
 188                 .handler = com_page_down
 189         }, {
 190                 .handler = NULL
 191         }
 192 };
 193
 194 static int find_cmd_byname(char *name)
 195 {
 196         int i;
 197
 198         for (i = 0; command_list[i].handler; i++)
 199                 if (!strcmp(command_list[i].name, name))
 200                         return i;
 201         return -1;
 202 }
 203
 204 /* taken from mutt */
 205 static char *km_keyname(int c)
 206 {
 207         static char buf[10];
 208
 209         if (c == KEY_UP) {
 210                 sprintf(buf, "<up>");
 211                 return buf;
 212         }
 213         if (c == KEY_DOWN) {
 214                 sprintf(buf, "<down>");
 215                 return buf;
 216         }
 217         if (c == KEY_LEFT) {
 218                 sprintf(buf, "<left>");
 219                 return buf;
 220         }
 221         if (c == KEY_RIGHT) {
 222                 sprintf(buf, "<right>");
 223                 return buf;
 224         }
 225         if (c == KEY_NPAGE) {
 226                 sprintf(buf, "<npage>");
 227                 return buf;
 228         }
 229         if (c == KEY_PPAGE) {
 230                 sprintf(buf, "<ppage>");
 231                 return buf;
 232         }
 233         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 234                 if (c < 0)
 235                         c += 256;
 236                 if (c < 128) {
 237                         buf[0] = '^';
 238                         buf[1] = (c + '@') & 0x7f;
 239                         buf[2] = 0;
 240                 } else
 241                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 242                                 (c >> 3) & 7, c & 7);
 243         } else if (c >= KEY_F0 && c < KEY_F(256))
 244                 sprintf(buf, "<F%d>", c - KEY_F0);
 245         else if (isprint(c))
 246                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 247         else
 248                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 249         return buf;
 250 }
 251
 252 static char *configfile_exists(void)
 253 {
 254         static char *config_file;
 255         char *tmp;
 256
 257         if (!conf.config_file_given) {
 258                 if (!config_file) {
 259                         char *home = para_homedir();
 260                         config_file = make_message("%s/.paraslash/gui.conf",
 261                                 home);
 262                         free(home);
 263                 }
 264                 tmp = config_file;
 265         } else
 266                 tmp = conf.config_file_arg;
 267         return file_exists(tmp)? tmp: NULL;
 268 }
 269
 270 /*
 271  * print num spaces to curses window
 272  */
 273 static void add_spaces(WINDOW* win, unsigned int num)
 274 {
 275         while (num > 0) {
 276                 num--;
 277                 waddstr(win, " ");
 278         }
 279 }
 280
 281 /*
 282  * print aligned string to curses window. This function always prints
 283  * exactly len chars.
 284  */
 285 static int align_str(WINDOW* win, char *str, unsigned int len,
 286                 unsigned int align)
 287 {
 288         int i, num; /* of spaces */
 289
 290         if (!win || !str)
 291                 return -1;
 292         num = len - strlen(str);
 293         if (num < 0) {
 294                 str[len] = '\0';
 295                 num = 0;
 296         }
 297         /* replace control characters by spaces */
 298         for (i = 0; i < len && str[i]; i++) {
 299                 if (str[i] == '\n' || str[i] == '\r' || str[i] == '\f')
 300                         str[i] = ' ';
 301         }
 302         if (align == LEFT) {
 303                 waddstr(win, str);
 304                 add_spaces(win, num);
 305         } else if (align == RIGHT) {
 306                 add_spaces(win, num);
 307                 waddstr(win, str);
 308         } else {
 309                 add_spaces(win, num / 2);
 310                 waddstr(win, str[0]? str: "");
 311                 add_spaces(win, num - num / 2);
 312         }
 313         return 1;
 314 }
 315
 316 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 317 {
 318         char *msg;
 319
 320         if (!curses_active)
 321                 return;
 322         wattron(in.win, COLOR_PAIR(color));
 323         PARA_VSPRINTF(fmt, msg);
 324         wmove(in.win, 0, 0);
 325         align_str(in.win, msg, sb.cols, LEFT);
 326         free(msg);
 327         wrefresh(in.win);
 328 }
 329
 330 /*
 331  * update the status bar
 332  */
 333 static void print_status_bar(void)
 334 {
 335         char *tmp;
 336
 337         if (!curses_active)
 338                 return;
 339         tmp = para_strdup(STANDARD_STATUS_BAR);
 340         wmove(sb.win, 0, 0);
 341         align_str(sb.win, tmp, sb.cols, CENTER);
 342         free(tmp);
 343         wrefresh(sb.win);
 344 }
 345
 346 /*
 347  * get the number of the oldest rbe that is (partially) visible. On return,
 348  * lines contains the sum of the number of lines of all visable entries. If the
 349  * first one is only partially visible, lines is greater than bot.lines.
 350  */
 351 static int first_visible_rbe(unsigned *lines)
 352 {
 353         int i;
 354         *lines = 0;
 355         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 356                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 357                 int rbe_lines;
 358                 if (!rbe)
 359                         return i - 1;
 360 //              fprintf(stderr, "found: %s\n", rbe->msg);
 361                 rbe_lines = NUM_LINES(rbe->len);
 362                 if (rbe_lines > bot.lines)
 363                         return -1;
 364                 *lines += rbe_lines;
 365                 if (*lines >= bot.lines)
 366                         return i;
 367         }
 368         return RINGBUFFER_SIZE - 1;
 369 }
 370
 371 static int draw_top_rbe(unsigned *lines)
 372 {
 373         unsigned len;
 374         int offset, fvr = first_visible_rbe(lines);
 375         struct rb_entry *rbe;
 376
 377         if (fvr < 0)
 378                 return -1;
 379         wmove(bot.win, 0, 0);
 380         rbe = ringbuffer_get(bot_win_rb, fvr);
 381         if (!rbe)
 382                 return -1;
 383         /* first rbe might be only partially visible */
 384         offset = (*lines - bot.lines) * bot.cols;
 385         len = strlen(rbe->msg);
 386         if (offset < 0 || len < offset)
 387                 return -1;
 388         wattron(bot.win, COLOR_PAIR(rbe->color));
 389         waddstr(bot.win, rbe->msg + offset);
 390         *lines = NUM_LINES(len - offset);
 391         return fvr;
 392 }
 393
 394 static void redraw_bot_win(void)
 395 {
 396         unsigned lines;
 397         int i;
 398
 399         wmove(bot.win, 0, 0);
 400         wclear(bot.win);
 401         i = draw_top_rbe(&lines);
 402         if (i <= 0)
 403                 goto out;
 404         while (i > 0 && lines < bot.lines) {
 405                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 406                 if (!rbe) {
 407                         lines++;
 408                         waddstr(bot.win, "\n");
 409                         continue;
 410                 }
 411                 lines += NUM_LINES(rbe->len);
 412                 wattron(bot.win, COLOR_PAIR(rbe->color));
 413                 waddstr(bot.win, "\n");
 414                 waddstr(bot.win, rbe->msg);
 415         }
 416 out:
 417         wrefresh(bot.win);
 418 }
 419
 420 static void rb_add_entry(int color, char *msg)
 421 {
 422         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 423         int x, y;
 424         new->color = color;
 425         new->len = strlen(msg);
 426         new->msg = msg;
 427         old = ringbuffer_add(bot_win_rb, new);
 428 //      fprintf(stderr, "added: %s\n", new->msg);
 429         if (old) {
 430                 free(old->msg);
 431                 free(old);
 432         }
 433         if (scroll_position) {
 434                 /* discard current scrolling, like xterm does */
 435                 scroll_position = 0;
 436                 redraw_bot_win();
 437                 return;
 438         }
 439         wattron(bot.win, COLOR_PAIR(color));
 440         getyx(bot.win, y, x);
 441         if (y || x)
 442                 waddstr(bot.win, "\n");
 443         waddstr(bot.win, msg);
 444 }
 445
 446 /*
 447  * print formated output to bot win and refresh
 448  */
 449 __printf_2_3 static void outputf(int color, const char* fmt,...)
 450 {
 451         char *msg;
 452
 453         if (!curses_active)
 454                 return;
 455         PARA_VSPRINTF(fmt, msg);
 456         rb_add_entry(color, msg);
 457         wrefresh(bot.win);
 458 }
 459
 460 static int add_output_line(char *line, __a_unused void *data)
 461 {
 462         if (!curses_active)
 463                 return 1;
 464         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 465         return 1;
 466 }
 467
 468 static int loglevel;
 469
 470 __printf_2_3 void para_log(int ll, const char *fmt,...)
 471 {
 472         int color;
 473         char *msg;
 474
 475         if (ll < loglevel || !curses_active)
 476                 return;
 477         switch (ll) {
 478                 case LL_DEBUG:
 479                 case LL_INFO:
 480                 case LL_NOTICE:
 481                         color = COLOR_MSG;
 482                         break;
 483                 default:
 484                         color = COLOR_ERRMSG;
 485         }
 486         PARA_VSPRINTF(fmt, msg);
 487         chop(msg);
 488         rb_add_entry(color, msg);
 489         wrefresh(bot.win);
 490 }
 491
 492 static void setup_signal_handling(void)
 493 {
 494         signal_pipe = para_signal_init();
 495         para_install_sighandler(SIGINT);
 496         para_install_sighandler(SIGTERM);
 497         para_install_sighandler(SIGCHLD);
 498         para_install_sighandler(SIGWINCH);
 499         para_install_sighandler(SIGUSR1);
 500         para_sigaction(SIGHUP, SIG_IGN);
 501 }
 502
 503 __noreturn static void do_exit(int ret)
 504 {
 505         para_sigaction(SIGTERM, SIG_IGN);
 506         kill(0, SIGTERM);
 507         exit(ret);
 508 }
 509
 510 static void shutdown_curses(void)
 511 {
 512         if (!curses_active)
 513                 return;
 514         def_prog_mode();
 515         curses_active = 0;
 516         endwin();
 517 }
 518
 519 __noreturn static void finish(int ret)
 520 {
 521         shutdown_curses();
 522         do_exit(ret);
 523 }
 524
 525 /*
 526  * exit curses and print given message to stdout/stderr
 527  */
 528 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 529 {
 530         va_list argp;
 531         FILE *outfd = ret? stderr: stdout;
 532
 533         shutdown_curses();
 534         va_start(argp, fmt);
 535         vfprintf(outfd, fmt, argp);
 536         va_end(argp);
 537         do_exit(ret);
 538 }
 539
 540 static void print_welcome(void)
 541 {
 542         if (loglevel > LL_NOTICE)
 543                 return;
 544         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 545                 " \"" CODENAME "\". Theme: %s", theme.name);
 546         wclrtoeol(bot.win);
 547 }
 548
 549 /*
 550  * init all windows
 551  */
 552 static void init_wins(int top_lines)
 553 {
 554         int i;
 555
 556         top.lines = top_lines;
 557         top.cols = COLS;
 558         top.begy = 0;
 559         top.begx = 0;
 560
 561         bot.lines = LINES - top.lines - 3;
 562         bot.cols = COLS;
 563         bot.begy = top.lines + 1;
 564         bot.begx = 0;
 565
 566         sb.lines = 1;
 567         sb.cols = COLS;
 568         sb.begy = LINES - 2;
 569         sb.begx = 0;
 570
 571         in.lines = 1;
 572         in.cols = COLS;
 573         in.begy = LINES - 1;
 574         in.begx = 0;
 575
 576         sep.lines = 1;
 577         sep.cols = COLS;
 578         sep.begy = top.lines;
 579         sep.begx = 0;
 580
 581         assume_default_colors(theme.default_fg, theme.default_bg);
 582         if (top.win) {
 583                 mvwin(top.win, top.begy, top.begx);
 584                 wresize(top.win, top.lines, top.cols);
 585
 586                 mvwin(sb.win, sb.begy, sb.begx);
 587                 wresize(sb.win, sb.lines, sb.cols);
 588
 589                 mvwin(sep.win, sep.begy, sep.begx);
 590                 wresize(sep.win, sep.lines, sep.cols);
 591
 592                 mvwin(bot.win, bot.begy, bot.begx);
 593                 wresize(bot.win, bot.lines, bot.cols);
 594
 595                 mvwin(in.win, in.begy, in.begx);
 596                 wresize(in.win, in.lines, in.cols);
 597         } else {
 598                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 599                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 600                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 601                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 602                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 603                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 604                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 605                 wclear(bot.win);
 606                 wclear(sb.win);
 607                 wclear(in.win);
 608                 scrollok(bot.win, 1);
 609                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 610                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 611                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 612                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 613                 nodelay(top.win, 1);
 614                 nodelay(bot.win, 1);
 615                 nodelay(sb.win, 1);
 616                 nodelay(in.win, 0);
 617
 618                 keypad(top.win, 1);
 619                 keypad(bot.win, 1);
 620                 keypad(sb.win, 1);
 621                 keypad(in.win, 1);
 622                 print_status_bar();
 623         }
 624         wmove(sep.win, 0, 0);
 625         for (i = 1; i <= COLS; i++)
 626                 waddstr(sep.win, theme.sep_str);
 627         wclear(top.win);
 628         //wclear(bot.win);
 629         wnoutrefresh(top.win);
 630         wnoutrefresh(bot.win);
 631         //wnoutrefresh(sb.win);
 632         print_status_bar();
 633         wnoutrefresh(in.win);
 634         wnoutrefresh(sep.win);
 635         doupdate();
 636 }
 637
 638 static void check_geometry(void)
 639 {
 640         if (LINES < theme.lines_min || COLS < theme.cols_min)
 641                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 642                         " (need at least %dx%d)\n", COLS, LINES,
 643                         theme.cols_min, theme.lines_min);
 644 }
 645
 646 /*
 647  * Print stat item #i to curses window
 648  */
 649 static void print_stat_item(int i)
 650 {
 651         char *tmp;
 652         struct stat_item_data d = theme.data[i];
 653         char *c = stat_content[i];
 654
 655         if (!curses_active || !d.len || !c)
 656                 return;
 657         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 658         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 659         wrefresh(top.win);
 660         wattron(top.win, COLOR_PAIR(i + 1));
 661         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 662         free(tmp);
 663         wrefresh(top.win);
 664 }
 665
 666 static int update_item(int item_num, char *buf)
 667 {
 668         char **c = stat_content + item_num;
 669
 670         free(*c);
 671         if (buf && buf[0])
 672                 goto dup;
 673         switch (item_num) {
 674         case SI_ARTIST:
 675                 *c = para_strdup("(artist tag not set)");
 676                 goto print;
 677         case SI_TITLE:
 678                 *c = para_strdup("(title tag not set)");
 679                 goto print;
 680         case SI_YEAR:
 681                 *c = para_strdup("????");
 682                 goto print;
 683         case SI_ALBUM:
 684                 *c = para_strdup("(album tag not set)");
 685                 goto print;
 686         case SI_COMMENT:
 687                 *c = para_strdup("(comment tag not set)");
 688                 goto print;
 689         }
 690 dup:
 691         *c = para_strdup(buf);
 692 print:
 693         print_stat_item(item_num);
 694         return 1;
 695 }
 696
 697 static int read_stat_pipe(fd_set *rfds)
 698 {
 699         static char *buf;
 700         static int bufsize, loaded;
 701         int ret, ret2;
 702         size_t sz;
 703
 704         if (stat_pipe < 0)
 705                 return 0;
 706         if (loaded >= bufsize) {
 707                 if (bufsize > 1000 * 1000) {
 708                         loaded = 0;
 709                         return 0;
 710                 }
 711                 bufsize += bufsize + 1000;
 712                 buf = para_realloc(buf, bufsize);
 713         }
 714         assert(loaded < bufsize);
 715         ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
 716                 rfds, &sz);
 717         loaded += sz;
 718         ret2 = for_each_stat_item(buf, loaded, update_item);
 719         if (ret < 0 || ret2 < 0) {
 720                 loaded = 0;
 721                 return ret2 < 0? ret2 : ret;
 722         }
 723         sz = ret2; /* what is left */
 724         if (sz > 0 && sz < loaded)
 725                 memmove(buf, buf + loaded - sz, sz);
 726         loaded = sz;
 727         return 1;
 728 }
 729
 730 static void print_all_items(void)
 731 {
 732         int i;
 733
 734         if (!curses_active)
 735                 return;
 736         FOR_EACH_STATUS_ITEM(i)
 737                 print_stat_item(i);
 738 }
 739
 740 static void clear_all_items(void)
 741 {
 742         int i;
 743
 744         FOR_EACH_STATUS_ITEM(i) {
 745                 free(stat_content[i]);
 746                 stat_content[i] = para_strdup("");
 747         }
 748 }
 749
 750 static void init_colors(void)
 751 {
 752         int i;
 753
 754         if (!has_colors())
 755                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 756         start_color();
 757         FOR_EACH_STATUS_ITEM(i)
 758                 if (theme.data[i].len)
 759                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 760         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 761         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 762         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 763         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 764         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 765         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 766         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 767         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 768         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 769 }
 770
 771 /*
 772  * (re-)initialize the curses library  FIXME: Error checking
 773  */
 774 static void init_curses(void)
 775 {
 776         curses_active = 1;
 777         if (top.win && refresh() == ERR) { /* refesh is really needed */
 778                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 779         }
 780         check_geometry();
 781         curs_set(0); /* make cursor invisible, ignore errors */
 782 //      if (noraw() == ERR);
 783 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 784 //                      "raw mode\n");
 785         nonl(); /* tell curses not to do NL->CR/NL on output */
 786         noecho(); /* don't echo input */
 787         cbreak(); /* take input chars one at a time, no wait for \n */
 788         //reset_prog_mode();
 789         init_colors();
 790         clear();
 791         init_wins(theme.top_lines_default);
 792         print_all_items();
 793         noecho(); /* don't echo input */
 794 }
 795
 796
 797 static void check_sigchld(void)
 798 {
 799         int ret;
 800         pid_t pid;
 801 reap_next_child:
 802         ret = para_reap_child(&pid);
 803         if (ret <= 0)
 804                 return;
 805         if (pid == cmd_pid) {
 806                 cmd_pid = 0;
 807                 cmd_died = 1;
 808         }
 809         goto reap_next_child;
 810 }
 811
 812 /*
 813  * This sucker modifies its first argument. *handler and *arg are
 814  * pointers to 0-terminated strings (inside line). Crap.
 815  */
 816 static int split_key_map(char *line, char **handler, char **arg)
 817 {
 818         if (!(*handler = strchr(line + 1, ':')))
 819                 goto err_out;
 820         **handler = '\0';
 821         (*handler)++;
 822         if (!(*arg = strchr(*handler, ':')))
 823                 goto err_out;
 824         **arg = '\0';
 825         (*arg)++;
 826         return 1;
 827 err_out:
 828         return 0;
 829 }
 830
 831 static int check_key_map_args(void)
 832 {
 833         char *s;
 834         int i, ret = -1;
 835         char *tmp = NULL, *handler, *arg;
 836
 837         for (i = 0; i < conf.key_map_given; ++i) {
 838                 s = conf.key_map_arg[i];
 839                 if (!(*s))
 840                         goto err_out;
 841                 free(tmp);
 842                 tmp = para_strdup(s);
 843                 if (!split_key_map(tmp, &handler, &arg))
 844                         goto err_out;
 845                 if (strlen(handler) != 1)
 846                         goto err_out;
 847                 if (*handler != 'x'
 848                         && *handler != 'd'
 849                         && *handler != 'i'
 850                         && *handler != 'p')
 851                         goto err_out;
 852                 if (*handler != 'i')
 853                         continue;
 854                 if (find_cmd_byname(arg) < 0)
 855                         goto err_out;
 856         }
 857         ret = 0;
 858 err_out:
 859         free(tmp);
 860         return ret;
 861 }
 862
 863 /*
 864  * React to various signal-related events
 865  */
 866 static void handle_signal(int sig)
 867 {
 868         switch (sig) {
 869         case SIGTERM:
 870                 msg_n_exit(EXIT_FAILURE,
 871                         "only the good die young (caught SIGTERM))\n");
 872                 return;
 873         case SIGWINCH:
 874                 if (curses_active) {
 875                         shutdown_curses();
 876                         init_curses();
 877                         redraw_bot_win();
 878                 }
 879                 return;
 880         case SIGINT:
 881                 PARA_WARNING_LOG("caught SIGINT, reset");
 882                 /* Nothing to do. SIGINT killed our child which gets noticed
 883                  * by do_select and resets everything.
 884                  */
 885                 return;
 886         case SIGUSR1:
 887                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 888                 com_reread_conf();
 889                 return;
 890         case SIGCHLD:
 891                 check_sigchld();
 892                 return;
 893         }
 894 }
 895
 896 static int open_stat_pipe(void)
 897 {
 898         static int init = 1;
 899         int ret, fds[3] = {0, 1, 0};
 900         pid_t pid;
 901
 902         if (init)
 903                 init = 0;
 904         else
 905                 /*
 906                  * Sleep a bit to avoid a busy loop. As the call to sleep() may
 907                  * be interrupted by SIGCHLD, we simply wait until the call
 908                  * succeeds.
 909                  */
 910                 while (sleep(2))
 911                         ; /* nothing */
 912         ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
 913         if (ret < 0)
 914                 return ret;
 915         ret = mark_fd_nonblocking(fds[1]);
 916         if (ret >= 0)
 917                 return fds[1];
 918         close(fds[1]);
 919         return ret;
 920 }
 921
 922 /*
 923  * This is the core select loop. Besides the (internal) signal
 924  * pipe, the following other fds are checked according to the mode:
 925  *
 926  * GETCH_MODE: check stdin, return when key is pressed
 927  *
 928  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 929  * of output has been read or when other end has closed command pipe or
 930  * when any key is pressed.
 931  *
 932  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 933  * is running. During that time curses is disabled.  Returns when
 934  * cmd_pid == 0.
 935  */
 936 static int do_select(int mode)
 937 {
 938         fd_set rfds;
 939         int ret;
 940         int max_fileno;
 941         char command_buf[4096] = "";
 942         int cbo = 0; /* command buf offset */
 943         struct timeval tv;
 944 repeat:
 945         tv.tv_sec = conf.timeout_arg  / 1000;
 946         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 947 //      ret = refresh_status();
 948         FD_ZERO(&rfds);
 949         max_fileno = 0;
 950         if (stat_pipe < 0)
 951                 stat_pipe = open_stat_pipe();
 952         if (stat_pipe >= 0)
 953                 para_fd_set(stat_pipe, &rfds, &max_fileno);
 954         /* signal pipe */
 955         para_fd_set(signal_pipe, &rfds, &max_fileno);
 956         /* command pipe only for COMMAND_MODE */
 957         if (command_pipe >= 0 && mode == COMMAND_MODE)
 958                 para_fd_set(command_pipe, &rfds, &max_fileno);
 959         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 960         if (ret <= 0)
 961                 goto check_return; /* skip fd checks */
 962         /* signals */
 963         ret = para_next_signal(&rfds);
 964         if (ret > 0)
 965                 handle_signal(ret);
 966         /* read command pipe if ready */
 967         if (command_pipe >= 0 && mode == COMMAND_MODE) {
 968                 size_t sz;
 969                 ret = read_nonblock(command_pipe, command_buf + cbo,
 970                         sizeof(command_buf) - 1 - cbo, &rfds, &sz);
 971                 cbo += sz;
 972                 sz = cbo;
 973                 cbo = for_each_line(command_buf, cbo, &add_output_line, NULL);
 974                 if (sz != cbo)
 975                         wrefresh(bot.win);
 976                 if (ret < 0) {
 977                         PARA_NOTICE_LOG("closing command pipe: %s",
 978                                 para_strerror(-ret));
 979                         close(command_pipe);
 980                         command_pipe = -1;
 981                         return 0;
 982                 }
 983         }
 984         ret = read_stat_pipe(&rfds);
 985         if (ret < 0) {
 986                 PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
 987                 close(stat_pipe);
 988                 stat_pipe = -1;
 989                 clear_all_items();
 990                 free(stat_content[SI_BASENAME]);
 991                 stat_content[SI_BASENAME] =
 992                         para_strdup("stat command terminated!?");
 993                 print_all_items();
 994         }
 995 check_return:
 996         switch (mode) {
 997         case COMMAND_MODE:
 998                 ret = wgetch(top.win);
 999                 if (ret != ERR && ret != KEY_RESIZE) {
1000                         if (command_pipe) {
1001                                 close(command_pipe);
1002                                 command_pipe = -1;
1003                         }
1004                         if (cmd_pid)
1005                                 kill(cmd_pid, SIGTERM);
1006                         return -1;
1007                 }
1008                 break;
1009         case GETCH_MODE:
1010                 ret = wgetch(top.win);
1011                 if (ret != ERR && ret != KEY_RESIZE)
1012                         return ret;
1013                 break;
1014         case EXTERNAL_MODE:
1015                 if (cmd_died) {
1016                         cmd_died = 0;
1017                         return 0;
1018                 }
1019         }
1020         goto repeat;
1021 }
1022
1023 /*
1024  * read from command pipe and print data to bot window
1025  */
1026 static int send_output(void)
1027 {
1028         int ret;
1029
1030         if (command_pipe < 0)
1031                 return 0;
1032         ret = mark_fd_nonblocking(command_pipe);
1033         if (ret < 0) {
1034                 close(command_pipe);
1035                 return ret;
1036         }
1037         if (do_select(COMMAND_MODE) >= 0)
1038                 PARA_INFO_LOG("command complete");
1039         else
1040                 PARA_NOTICE_LOG("command aborted");
1041         print_in_bar(COLOR_MSG, " ");
1042         return 1;
1043 }
1044
1045 static int client_cmd_cmdline(char *cmd)
1046 {
1047         int ret, fds[3] = {0, 1, 0};
1048         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1049
1050         outputf(COLOR_COMMAND, "%s", c);
1051         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1052         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1053         free(c);
1054         if (ret < 0)
1055                 return -1;
1056         command_pipe = fds[1];
1057         return send_output();
1058 }
1059
1060 /*
1061  * exec command and print output to bot win
1062  */
1063 static int display_cmd(char *cmd)
1064 {
1065         int fds[3] = {0, 1, 0};
1066
1067         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1068         outputf(COLOR_COMMAND, "%s", cmd);
1069         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1070                 return -1;
1071         command_pipe = fds[1];
1072         return send_output();
1073 }
1074
1075 /*
1076  * shutdown curses and stat pipe before executing external commands
1077  */
1078 static int external_cmd(char *cmd)
1079 {
1080         int fds[3] = {-1, -1, -1};
1081
1082         if (cmd_pid)
1083                 return -1;
1084         shutdown_curses();
1085         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1086         cmd_died = 0;
1087         do_select(EXTERNAL_MODE);
1088         init_curses();
1089         return 0;
1090 }
1091
1092 static void print_scroll_msg(void)
1093 {
1094         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1095         int first_rbe = first_visible_rbe(&lines_total);
1096         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1097                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1098 }
1099
1100 static void com_page_down(void)
1101 {
1102         unsigned lines = 0;
1103         int i = scroll_position;
1104         while (lines < bot.lines && --i > 0) {
1105                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1106                 if (!rbe)
1107                         break;
1108                 lines += NUM_LINES(strlen(rbe->msg));
1109         }
1110         if (lines) {
1111                 scroll_position = i;
1112                 redraw_bot_win();
1113                 print_scroll_msg();
1114                 return;
1115         }
1116         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1117 }
1118
1119 static void com_page_up(void)
1120 {
1121         unsigned lines;
1122         int fvr = first_visible_rbe(&lines);
1123
1124         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1125                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1126                 return;
1127         }
1128         scroll_position = fvr + 1;
1129         for (; scroll_position > 0; scroll_position--) {
1130                 first_visible_rbe(&lines);
1131                 if (lines == bot.lines)
1132                         break;
1133         }
1134         redraw_bot_win();
1135         print_scroll_msg();
1136 }
1137
1138 static void com_scroll_down(void)
1139 {
1140         struct rb_entry *rbe;
1141         int rbe_lines;
1142
1143         if (!scroll_position) {
1144                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1145                 return;
1146         }
1147         scroll_position--;
1148         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1149         rbe_lines = NUM_LINES(rbe->len);
1150         wscrl(bot.win, rbe_lines);
1151         wmove(bot.win, bot.lines - rbe_lines, 0);
1152         wattron(bot.win, COLOR_PAIR(rbe->color));
1153         waddstr(bot.win, rbe->msg);
1154         wrefresh(bot.win);
1155         print_scroll_msg();
1156 }
1157
1158 static void com_scroll_up(void)
1159 {
1160         struct rb_entry *rbe = NULL;
1161         unsigned lines;
1162         int i, first_rbe, num_scroll;
1163
1164         /* the entry that is going to vanish */
1165         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1166         if (!rbe)
1167                 goto err_out;
1168         num_scroll = NUM_LINES(rbe->len);
1169         first_rbe = first_visible_rbe(&lines);
1170         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1171                 goto err_out;
1172         scroll_position++;
1173         wscrl(bot.win, -num_scroll);
1174         i = draw_top_rbe(&lines);
1175         if (i < 0)
1176                 goto err_out;
1177         while (i > 0 && lines < num_scroll) {
1178                 int rbe_lines;
1179                 rbe = ringbuffer_get(bot_win_rb, --i);
1180                 if (!rbe)
1181                         break;
1182                 rbe_lines = NUM_LINES(rbe->len);
1183                 lines += rbe_lines;
1184 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1185                 wattron(bot.win, COLOR_PAIR(rbe->color));
1186                 waddstr(bot.win, "\n");
1187                 waddstr(bot.win, rbe->msg);
1188                 if (!i)
1189                         break;
1190                 i--;
1191         }
1192         wrefresh(bot.win);
1193         print_scroll_msg();
1194         return;
1195 err_out:
1196         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1197 }
1198
1199 static void com_ll_decr(void)
1200 {
1201         if (loglevel <= LL_DEBUG) {
1202                 print_in_bar(COLOR_ERRMSG,
1203                         "loglevel already at maximal verbosity\n");
1204                 return;
1205         }
1206         loglevel--;
1207         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1208 }
1209
1210 static void com_ll_incr(void)
1211 {
1212         if (loglevel >= LL_EMERG) {
1213                 print_in_bar(COLOR_ERRMSG,
1214                         "loglevel already at minimal verbosity\n");
1215                 return;
1216         }
1217         loglevel++;
1218         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1219 }
1220
1221 /*
1222  * reread configuration, terminate on errors
1223  */
1224 static void com_reread_conf(void)
1225 {
1226         char *cf =configfile_exists();
1227         struct gui_cmdline_parser_params params = {
1228                 .override = 1,
1229                 .initialize = 1,
1230                 .check_required = 0,
1231                 .check_ambiguity = 0
1232         };
1233
1234         if (!cf) {
1235                 PARA_WARNING_LOG("there is no configuration to read");
1236                 return;
1237         }
1238         PARA_INFO_LOG("rereading command line options and config file");
1239         gui_cmdline_parser(_argc, _argv, &conf);
1240         gui_cmdline_parser_config_file(cf, &conf, &params);
1241         PARA_NOTICE_LOG("config file reloaded");
1242         if (check_key_map_args() < 0)
1243                 finish(EXIT_FAILURE);
1244 }
1245
1246 static void com_help(void)
1247 {
1248         int i;
1249
1250         for (i = 0; i < conf.key_map_given; ++i) {
1251                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1252                 const char *handler_text = "???", *desc = NULL;
1253
1254                 if (!split_key_map(tmp, &handler, &arg)) {
1255                         free(tmp);
1256                         return;
1257                 }
1258                 switch (*handler) {
1259                         case 'i':
1260                                 handler_text = "internal";
1261                                 desc = command_list[find_cmd_byname(arg)].description;
1262                                 break;
1263                         case 'x': handler_text = "external"; break;
1264                         case 'd': handler_text = "display "; break;
1265                         case 'p': handler_text = "para    "; break;
1266                 }
1267                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1268                         strlen(arg) < 8? "\t" : "",
1269                         desc? desc : "");
1270                 free(tmp);
1271         }
1272         for (i = 0; command_list[i].handler; i++) {
1273                 struct gui_command gc = command_list[i];
1274
1275                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1276                         strlen(gc.name) < 8? "\t" : "",
1277                         gc.description);
1278         }
1279         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1280                 "for more info");
1281 }
1282
1283 static void com_shrink_top_win(void)
1284 {
1285         if (top.lines <= theme.top_lines_min) {
1286                 PARA_WARNING_LOG("can not decrease top window");
1287                 return;
1288         }
1289         init_wins(top.lines - 1);
1290         wclear(top.win);
1291         print_all_items();
1292         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1293 }
1294
1295 static void com_enlarge_top_win(void)
1296 {
1297         if (bot.lines < 3) {
1298                 PARA_WARNING_LOG("can not increase top window");
1299                 return;
1300         }
1301         init_wins(top.lines + 1);
1302         wclear(top.win);
1303         print_all_items();
1304         print_in_bar(COLOR_MSG, "increased top window");
1305 }
1306
1307 static void com_version(void)
1308 {
1309         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1310                 CODENAME "\"");
1311 }
1312
1313 __noreturn static void com_quit(void)
1314 {
1315         finish(0);
1316 }
1317
1318 static void com_refresh(void)
1319 {
1320         shutdown_curses();
1321         init_curses();
1322 }
1323
1324 static void change_theme(int next)
1325 {
1326         if (next)
1327                 next_theme(&theme);
1328         else
1329                 prev_theme(&theme);
1330         /* This seems to be needed twice, why? */
1331         com_refresh();
1332         com_refresh();
1333         PARA_NOTICE_LOG("new theme: %s", theme.name);
1334 }
1335
1336 static void com_next_theme(void)
1337 {
1338         change_theme(1);
1339 }
1340
1341 static void com_prev_theme(void)
1342 {
1343         change_theme(0);
1344 }
1345
1346
1347 static void handle_command(int c)
1348 {
1349         int i;
1350
1351         /* first check user's key bindings */
1352         for (i = 0; i < conf.key_map_given; ++i) {
1353                 char *tmp, *handler, *arg;
1354
1355                 tmp = para_strdup(conf.key_map_arg[i]);
1356                 if (!split_key_map(tmp, &handler, &arg)) {
1357                         free(tmp);
1358                         return;
1359                 }
1360                 if (strcmp(tmp, km_keyname(c))) {
1361                         free(tmp);
1362                         continue;
1363                 }
1364                 if (*handler == 'd')
1365                         display_cmd(arg);
1366                 else if (*handler == 'x')
1367                         external_cmd(arg);
1368                 else if (*handler == 'p')
1369                         client_cmd_cmdline(arg);
1370                 else if (*handler == 'i') {
1371                         int num = find_cmd_byname(arg);
1372                         if (num >= 0)
1373                                 command_list[num].handler();
1374                 }
1375                 free(tmp);
1376                 return;
1377         }
1378         /* not found, check internal key bindings */
1379         for (i = 0; command_list[i].handler; i++) {
1380                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1381                         command_list[i].handler();
1382                         return;
1383                 }
1384         }
1385         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1386                 km_keyname(c));
1387 }
1388
1389 int main(int argc, char *argv[])
1390 {
1391         int ret;
1392         char *cf;
1393
1394         _argc = argc;
1395         _argv = argv;
1396
1397         if (gui_cmdline_parser(argc, argv, &conf)) {
1398                 fprintf(stderr, "parse error while reading command line\n");
1399                 exit(EXIT_FAILURE);
1400         }
1401         HANDLE_VERSION_FLAG("gui", conf);
1402         init_theme(0, &theme);
1403         top.lines = theme.top_lines_default;
1404         if (check_key_map_args() < 0) {
1405                 fprintf(stderr, "invalid key map\n");
1406                 exit(EXIT_FAILURE);
1407         }
1408         cf = configfile_exists();
1409         if (!cf && conf.config_file_given) {
1410                 fprintf(stderr, "can not read config file %s\n",
1411                         conf.config_file_arg);
1412                 exit(EXIT_FAILURE);
1413         }
1414         if (cf) {
1415                 struct gui_cmdline_parser_params params = {
1416                         .override = 0,
1417                         .initialize = 0,
1418                         .check_required = 0,
1419                         .check_ambiguity = 0
1420                 };
1421                 gui_cmdline_parser_config_file(cf, &conf, &params);
1422         }
1423         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1424         if (check_key_map_args() < 0) {
1425                 fprintf(stderr, "invalid key map in config file\n");
1426                 exit(EXIT_FAILURE);
1427         }
1428         setup_signal_handling();
1429         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1430         initscr(); /* needed only once, always successful */
1431         init_curses();
1432         print_welcome();
1433         for (;;) {
1434                 print_status_bar();
1435                 ret = do_select(GETCH_MODE);
1436                 if (!ret)
1437                         continue;
1438                 print_in_bar(COLOR_MSG, " ");
1439                 handle_command(ret);
1440         }
1441 }