gui.c

   1 /*
   2  * Copyright (C) 1998-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c ncurses-based interface for paraslash */
   8
   9 #include <signal.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include "gui.cmdline.h"
  13 #include "para.h"
  14 #include "gui.h"
  15 #include <curses.h>
  16 #include "ringbuffer.h"
  17 #include "gui_common.h"
  18 #include "fd.h"
  19 #include "error.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "signal.h"
  23
  24 /** define the array of error lists needed by para_gui */
  25 INIT_GUI_ERRLISTS;
  26 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 void finish(int sig);
  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 void *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 audiod_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 int _argc;
  95 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 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, const char *string, unsigned int len,
 286                 unsigned int align)
 287 {
 288         int num; /* of spaces */
 289         char *str;
 290
 291         if (!win || !string)
 292                 return -1;
 293         num = len - strlen(string);
 294         str = para_strdup(string);
 295         if (num < 0) {
 296                 str[len] = '\0';
 297                 num = 0;
 298         }
 299         if (align == LEFT) {
 300                 waddstr(win, str);
 301                 add_spaces(win, num);
 302         } else if (align == RIGHT) {
 303                 add_spaces(win, num);
 304                 waddstr(win, str);
 305         } else {
 306                 add_spaces(win, num / 2);
 307                 waddstr(win, str[0]? str: "");
 308                 add_spaces(win, num - num / 2);
 309         }
 310         free(str);
 311         return 1;
 312 }
 313
 314 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 315 {
 316         char *msg;
 317
 318         if (!curses_active)
 319                 return;
 320         wattron(in.win, COLOR_PAIR(color));
 321         PARA_VSPRINTF(fmt, msg);
 322         wmove(in.win, 0, 0);
 323         align_str(in.win, msg, sb.cols, LEFT);
 324         free(msg);
 325         wrefresh(in.win);
 326 }
 327
 328 /*
 329  * update the status bar
 330  */
 331 static void print_status_bar(void)
 332 {
 333         if (!curses_active)
 334                 return;
 335         wmove(sb.win, 0, 0);
 336         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 337         wrefresh(sb.win);
 338 }
 339
 340 /*
 341  * get the number of the oldest rbe that is (partially) visible. On return,
 342  * lines contains the sum of the number of lines of all visable entries. If the
 343  * first one is only partially visible, lines is greater than bot.lines.
 344  */
 345 static int first_visible_rbe(unsigned *lines)
 346 {
 347         int i;
 348         *lines = 0;
 349         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 350                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 351                 int rbe_lines;
 352                 if (!rbe)
 353                         return i - 1;
 354 //              fprintf(stderr, "found: %s\n", rbe->msg);
 355                 rbe_lines = NUM_LINES(rbe->len);
 356                 if (rbe_lines > bot.lines)
 357                         return -1;
 358                 *lines += rbe_lines;
 359                 if (*lines >= bot.lines)
 360                         return i;
 361         }
 362         return RINGBUFFER_SIZE - 1;
 363 }
 364
 365 static int draw_top_rbe(unsigned *lines)
 366 {
 367         unsigned len;
 368         int offset, fvr = first_visible_rbe(lines);
 369         struct rb_entry *rbe;
 370
 371         if (fvr < 0)
 372                 return -1;
 373         wmove(bot.win, 0, 0);
 374         rbe = ringbuffer_get(bot_win_rb, fvr);
 375         if (!rbe)
 376                 return -1;
 377         /* first rbe might be only partially visible */
 378         offset = (*lines - bot.lines) * bot.cols;
 379         len = strlen(rbe->msg);
 380         if (offset < 0 || len < offset)
 381                 return -1;
 382         wattron(bot.win, COLOR_PAIR(rbe->color));
 383         waddstr(bot.win, rbe->msg + offset);
 384         *lines = NUM_LINES(len - offset);
 385         return fvr;
 386 }
 387
 388 static void redraw_bot_win(void)
 389 {
 390         unsigned lines;
 391         int i;
 392
 393         wmove(bot.win, 0, 0);
 394         wclear(bot.win);
 395         i = draw_top_rbe(&lines);
 396         if (i <= 0)
 397                 goto out;
 398         while (i > 0 && lines < bot.lines) {
 399                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 400                 if (!rbe) {
 401                         lines++;
 402                         waddstr(bot.win, "\n");
 403                         continue;
 404                 }
 405                 lines += NUM_LINES(rbe->len);
 406                 wattron(bot.win, COLOR_PAIR(rbe->color));
 407                 waddstr(bot.win, "\n");
 408                 waddstr(bot.win, rbe->msg);
 409         }
 410 out:
 411         wrefresh(bot.win);
 412 }
 413
 414 static void rb_add_entry(int color, char *msg)
 415 {
 416         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 417         int x, y;
 418         new->color = color;
 419         new->len = strlen(msg);
 420         new->msg = msg;
 421         old = ringbuffer_add(bot_win_rb, new);
 422 //      fprintf(stderr, "added: %s\n", new->msg);
 423         if (old) {
 424                 free(old->msg);
 425                 free(old);
 426         }
 427         if (scroll_position) {
 428                 /* discard current scrolling, like xterm does */
 429                 scroll_position = 0;
 430                 redraw_bot_win();
 431                 return;
 432         }
 433         wattron(bot.win, COLOR_PAIR(color));
 434         getyx(bot.win, y, x);
 435         if (y || x)
 436                 waddstr(bot.win, "\n");
 437         waddstr(bot.win, msg);
 438 }
 439
 440 /*
 441  * print formated output to bot win and refresh
 442  */
 443 __printf_2_3 static void outputf(int color, const char* fmt,...)
 444 {
 445         char *msg;
 446
 447         if (!curses_active)
 448                 return;
 449         PARA_VSPRINTF(fmt, msg);
 450         rb_add_entry(color, msg);
 451         wrefresh(bot.win);
 452 }
 453
 454 static int add_output_line(char *line, __a_unused void *data)
 455 {
 456         if (!curses_active)
 457                 return 1;
 458         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 459         return 1;
 460 }
 461
 462 void para_log(int ll, const char *fmt,...)
 463 {
 464         int color;
 465         char *msg;
 466
 467         if (ll < conf.loglevel_arg || !curses_active)
 468                 return;
 469         switch (ll) {
 470                 case DEBUG:
 471                 case INFO:
 472                 case NOTICE:
 473                         color = COLOR_MSG;
 474                         break;
 475                 default:
 476                         color = COLOR_ERRMSG;
 477         }
 478         PARA_VSPRINTF(fmt, msg);
 479         chop(msg);
 480         rb_add_entry(color, msg);
 481         wrefresh(bot.win);
 482 }
 483
 484 static void setup_signal_handling(void)
 485 {
 486         signal_pipe = para_signal_init();
 487         para_install_sighandler(SIGINT);
 488         para_install_sighandler(SIGTERM);
 489         para_install_sighandler(SIGCHLD);
 490         para_install_sighandler(SIGWINCH);
 491         para_install_sighandler(SIGUSR1);
 492 //      signal(SIGPIPE, SIG_IGN);
 493         signal(SIGHUP, SIG_IGN);
 494 }
 495
 496 static void do_exit(int ret)
 497 {
 498         signal(SIGTERM, SIG_IGN);
 499         kill(0, SIGTERM);
 500         exit(ret);
 501 }
 502
 503 static void shutdown_curses(void)
 504 {
 505         if (!curses_active)
 506                 return;
 507         def_prog_mode();
 508         curses_active = 0;
 509         endwin();
 510 }
 511
 512 static void finish(int ret)
 513 {
 514         shutdown_curses();
 515         do_exit(ret);
 516 }
 517
 518 /*
 519  * exit curses and print given message to stdout/stderr
 520  */
 521 __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 522 {
 523         va_list argp;
 524         FILE *outfd = ret? stderr: stdout;
 525
 526         shutdown_curses();
 527         va_start(argp, fmt);
 528         vfprintf(outfd, fmt, argp);
 529         va_end(argp);
 530         do_exit(ret);
 531 }
 532
 533 static void print_welcome(void)
 534 {
 535         int ll = conf.loglevel_arg;
 536         if (ll > NOTICE)
 537                 return;
 538         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 539                 " \"" CODENAME "\". Theme: %s", theme.name);
 540         wclrtoeol(bot.win);
 541 }
 542
 543 /*
 544  * init all windows
 545  */
 546 static void init_wins(int top_lines)
 547 {
 548         int i;
 549
 550         top.lines = top_lines;
 551         top.cols = COLS;
 552         top.begy = 0;
 553         top.begx = 0;
 554
 555         bot.lines = LINES - top.lines - 3;
 556         bot.cols = COLS;
 557         bot.begy = top.lines + 1;
 558         bot.begx = 0;
 559
 560         sb.lines = 1;
 561         sb.cols = COLS;
 562         sb.begy = LINES - 2;
 563         sb.begx = 0;
 564
 565         in.lines = 1;
 566         in.cols = COLS;
 567         in.begy = LINES - 1;
 568         in.begx = 0;
 569
 570         sep.lines = 1;
 571         sep.cols = COLS;
 572         sep.begy = top.lines;
 573         sep.begx = 0;
 574
 575         assume_default_colors(theme.default_fg, theme.default_bg);
 576         if (top.win) {
 577                 mvwin(top.win, top.begy, top.begx);
 578                 wresize(top.win, top.lines, top.cols);
 579
 580                 mvwin(sb.win, sb.begy, sb.begx);
 581                 wresize(sb.win, sb.lines, sb.cols);
 582
 583                 mvwin(sep.win, sep.begy, sep.begx);
 584                 wresize(sep.win, sep.lines, sep.cols);
 585
 586                 mvwin(bot.win, bot.begy, bot.begx);
 587                 wresize(bot.win, bot.lines, bot.cols);
 588
 589                 mvwin(in.win, in.begy, in.begx);
 590                 wresize(in.win, in.lines, in.cols);
 591         } else {
 592                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 593                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 594                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 595                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 596                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 597                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 598                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 599                 wclear(bot.win);
 600                 wclear(sb.win);
 601                 wclear(in.win);
 602                 scrollok(bot.win, 1);
 603                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 604                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 605                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 606                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 607                 nodelay(top.win, 1);
 608                 nodelay(bot.win, 1);
 609                 nodelay(sb.win, 1);
 610                 nodelay(in.win, 0);
 611
 612                 keypad(top.win, 1);
 613                 keypad(bot.win, 1);
 614                 keypad(sb.win, 1);
 615                 keypad(in.win, 1);
 616                 print_status_bar();
 617         }
 618         wmove(sep.win, 0, 0);
 619         for (i = 1; i <= COLS; i++)
 620                 waddstr(sep.win, theme.sep_str);
 621         wclear(top.win);
 622         //wclear(bot.win);
 623         wnoutrefresh(top.win);
 624         wnoutrefresh(bot.win);
 625         //wnoutrefresh(sb.win);
 626         print_status_bar();
 627         wnoutrefresh(in.win);
 628         wnoutrefresh(sep.win);
 629         doupdate();
 630 }
 631
 632 static void check_geometry(void)
 633 {
 634         if (LINES < theme.lines_min || COLS < theme.cols_min)
 635                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 636                         " (need at least %dx%d)\n", COLS, LINES,
 637                         theme.cols_min, theme.lines_min);
 638 }
 639
 640 /*
 641  * Print stat item #i to curses window
 642  */
 643 static void print_stat_item(int i)
 644 {
 645         char *tmp;
 646         struct stat_item_data d = theme.data[i];
 647         char *c = stat_content[i];
 648
 649         if (!curses_active || !d.len || !c)
 650                 return;
 651         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 652         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 653         wrefresh(top.win);
 654         wattron(top.win, COLOR_PAIR(i + 1));
 655         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 656         free(tmp);
 657         wrefresh(top.win);
 658 }
 659
 660 static void print_all_items(void)
 661 {
 662         int i;
 663
 664         if (!curses_active)
 665                 return;
 666         FOR_EACH_STATUS_ITEM(i)
 667                 print_stat_item(i);
 668 }
 669
 670 static void clear_all_items(void)
 671 {
 672         int i;
 673
 674         FOR_EACH_STATUS_ITEM(i) {
 675                 free(stat_content[i]);
 676                 stat_content[i] = para_strdup("");
 677         }
 678 }
 679
 680 static void init_colors(void)
 681 {
 682         int i;
 683
 684         if (!has_colors())
 685                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 686         start_color();
 687         FOR_EACH_STATUS_ITEM(i)
 688                 if (theme.data[i].len)
 689                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 690         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 691         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 692         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 693         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 694         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 695         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 696         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 697         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 698         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 699 }
 700
 701 /*
 702  * (re-)initialize the curses library  FIXME: Error checking
 703  */
 704 static void init_curses(void)
 705 {
 706         curses_active = 1;
 707         if (top.win && refresh() == ERR) { /* refesh is really needed */
 708                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 709         }
 710         check_geometry();
 711         curs_set(0); /* make cursor invisible, ignore errors */
 712 //      if (noraw() == ERR);
 713 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 714 //                      "raw mode\n");
 715         nonl(); /* tell curses not to do NL->CR/NL on output */
 716         noecho(); /* don't echo input */
 717         cbreak(); /* take input chars one at a time, no wait for \n */
 718         //reset_prog_mode();
 719         init_colors();
 720         clear();
 721         init_wins(theme.top_lines_default);
 722         print_all_items();
 723         noecho(); /* don't echo input */
 724 }
 725
 726
 727 static void check_sigchld(void)
 728 {
 729         int ret;
 730         pid_t pid;
 731 reap_next_child:
 732         ret = para_reap_child(&pid);
 733         if (ret <= 0)
 734                 return;
 735         if (pid == cmd_pid) {
 736                 cmd_pid = 0;
 737                 cmd_died = 1;
 738         }
 739         goto reap_next_child;
 740 }
 741
 742 /*
 743  * print status line if line starts with known command.
 744  */
 745 static int check_stat_line(char *line, __a_unused void *data)
 746 {
 747         int i;
 748
 749 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 750         i = stat_line_valid(line);
 751         if (i >= 0) {
 752                 line += strlen(status_item_list[i]) + 1;
 753                 if (*line == ' ')
 754                         line++;
 755                 free(stat_content[i]);
 756                 stat_content[i] = para_strdup(line);
 757                 print_stat_item(i);
 758         }
 759         return 1;
 760 }
 761
 762 /*
 763  * This sucker modifies its first argument. *handler and *arg are
 764  * pointers to 0-terminated strings (inside line). Crap.
 765  */
 766 static int split_key_map(char *line, char **handler, char **arg)
 767 {
 768         if (!(*handler = strchr(line + 1, ':')))
 769                 goto err_out;
 770         **handler = '\0';
 771         (*handler)++;
 772         if (!(*arg = strchr(*handler, ':')))
 773                 goto err_out;
 774         **arg = '\0';
 775         (*arg)++;
 776         return 1;
 777 err_out:
 778         return 0;
 779 }
 780
 781 static int check_key_map_args(void)
 782 {
 783         char *s;
 784         int i, ret = -1;
 785         char *tmp = NULL, *handler, *arg;
 786
 787         for (i = 0; i < conf.key_map_given; ++i) {
 788                 s = conf.key_map_arg[i];
 789                 if (!(*s))
 790                         goto err_out;
 791                 free(tmp);
 792                 tmp = para_strdup(s);
 793                 if (!split_key_map(tmp, &handler, &arg))
 794                         goto err_out;
 795                 if (strlen(handler) != 1)
 796                         goto err_out;
 797                 if (*handler != 'x'
 798                         && *handler != 'd'
 799                         && *handler != 'i'
 800                         && *handler != 'p')
 801                         goto err_out;
 802                 if (*handler != 'i')
 803                         continue;
 804                 if (find_cmd_byname(arg) < 0)
 805                         goto err_out;
 806         }
 807         ret = 0;
 808 err_out:
 809         free(tmp);
 810         return ret;
 811 }
 812
 813 /*
 814  * React to various signal-related events
 815  */
 816 static void handle_signal(int sig)
 817 {
 818         switch (sig) {
 819         case SIGTERM:
 820                 msg_n_exit(EXIT_FAILURE,
 821                         "only the good die young (caught SIGTERM))\n");
 822                 return;
 823         case SIGWINCH:
 824                 if (curses_active) {
 825                         shutdown_curses();
 826                         init_curses();
 827                         redraw_bot_win();
 828                 }
 829                 return;
 830         case SIGINT:
 831                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 832                 /* Nothing to do. SIGINT killed our child, para_client stat.
 833                  * This get noticed by do_select which resets everything
 834                  */
 835                 return;
 836         case SIGUSR1:
 837                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 838                 com_reread_conf();
 839                 return;
 840         case SIGCHLD:
 841                 check_sigchld();
 842                 return;
 843         }
 844 }
 845
 846 static int open_audiod_pipe(void)
 847 {
 848         static int init = 1;
 849
 850         if (init)
 851                 init = 0;
 852         else
 853                 sleep(1);
 854         return para_open_audiod_pipe(conf.stat_cmd_arg);
 855 }
 856
 857 /*
 858  * This is the core select loop. Besides the (internal) signal
 859  * pipe, the following other fds are checked according to the mode:
 860  *
 861  * GETCH_MODE: check stdin, return when key is pressed
 862  *
 863  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 864  * of output has been read or when other end has closed command pipe or
 865  * when any key is pressed.
 866  *
 867  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 868  * is running. During that thime curses is disabled.  Returns when
 869  * cmd_pid == 0.
 870  */
 871 static int do_select(int mode)
 872 {
 873         fd_set rfds;
 874         int ret;
 875         int max_fileno, cp_numread = 1;
 876         char command_buf[4096] = "";
 877         int cbo = 0; /* command buf offset */
 878         struct timeval tv;
 879 repeat:
 880         tv.tv_sec = conf.timeout_arg  / 1000;
 881         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 882 //      ret = refresh_status();
 883         FD_ZERO(&rfds);
 884         max_fileno = 0;
 885         /* audiod pipe */
 886         if (audiod_pipe < 0)
 887                 audiod_pipe = open_audiod_pipe();
 888         if (audiod_pipe >= 0)
 889                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 890         /* signal pipe */
 891         para_fd_set(signal_pipe, &rfds, &max_fileno);
 892         /* command pipe only for COMMAND_MODE */
 893         if (command_pipe >= 0 && mode == COMMAND_MODE)
 894                 para_fd_set(command_pipe, &rfds, &max_fileno);
 895         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 896         if (ret <= 0)
 897                 goto check_return; /* skip fd checks */
 898         /* signals */
 899         if (FD_ISSET(signal_pipe, &rfds)) {
 900                 int sig_nr = para_next_signal();
 901                 if (sig_nr > 0)
 902                         handle_signal(sig_nr);
 903         }
 904         /* read command pipe if ready */
 905         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 906                         FD_ISSET(command_pipe, &rfds)) {
 907                 cp_numread = read(command_pipe, command_buf + cbo,
 908                         sizeof(command_buf) - 1 - cbo);
 909                 if (cp_numread >= 0)
 910                         cbo += cp_numread;
 911                 else {
 912                         if (cp_numread < 0)
 913                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 914                         close(command_pipe);
 915                         command_pipe = -1;
 916                 }
 917         }
 918         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 919                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 920                         close(audiod_pipe);
 921                         audiod_pipe = -1;
 922                         clear_all_items();
 923                         free(stat_content[SI_BASENAME]);
 924                         stat_content[SI_BASENAME] =
 925                                 para_strdup("audiod not running!?");
 926                         print_all_items();
 927                 }
 928 check_return:
 929         switch (mode) {
 930         case COMMAND_MODE:
 931                 if (cp_numread <= 0 && !cbo) /* command complete */
 932                         return 0;
 933                 if (cbo)
 934                         cbo = for_each_line(command_buf, cbo,
 935                                 &add_output_line, NULL);
 936                 if (cp_numread <= 0)
 937                         cbo = 0;
 938                 wrefresh(bot.win);
 939                 ret = wgetch(top.win);
 940                 if (ret != ERR && ret != KEY_RESIZE) {
 941                         if (command_pipe) {
 942                                 close(command_pipe);
 943                                 command_pipe = -1;
 944                         }
 945                         if (cmd_pid)
 946                                 kill(cmd_pid, SIGTERM);
 947                         return -1;
 948                 }
 949                 break;
 950         case GETCH_MODE:
 951                 ret = wgetch(top.win);
 952                 if (ret != ERR && ret != KEY_RESIZE)
 953                         return ret;
 954                 break;
 955         case EXTERNAL_MODE:
 956                 if (cmd_died) {
 957                         cmd_died = 0;
 958                         return 0;
 959                 }
 960         }
 961         goto repeat;
 962 }
 963
 964 /*
 965  * read from command pipe and print data to bot window
 966  */
 967 static int send_output(void)
 968 {
 969         if (command_pipe < 0)
 970                 return 0;
 971         if (do_select(COMMAND_MODE) >= 0)
 972                 PARA_INFO_LOG("%s", "command complete");
 973         else
 974                 PARA_NOTICE_LOG("%s", "command aborted");
 975         print_in_bar(COLOR_MSG, " ");
 976         return 1;
 977 }
 978
 979 static int client_cmd_cmdline(char *cmd)
 980 {
 981         int ret, fds[3] = {0, 1, 0};
 982         char *c = make_message(BINDIR "/para_client %s", cmd);
 983
 984         outputf(COLOR_COMMAND, "%s", c);
 985         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
 986         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
 987         free(c);
 988         if (ret < 0)
 989                 return -1;
 990         command_pipe = fds[1];
 991         mark_fd_nonblocking(command_pipe);
 992         return send_output();
 993 }
 994
 995 /*
 996  * exec command and print output to bot win
 997  */
 998 static int display_cmd(char *cmd)
 999 {
1000         int fds[3] = {0, 1, 0};
1001
1002         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1003         outputf(COLOR_COMMAND, "%s", cmd);
1004         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1005                 return -1;
1006         command_pipe = fds[1];
1007         mark_fd_nonblocking(command_pipe);
1008         return send_output();
1009 }
1010
1011 /*
1012  * shutdown curses and stat pipe before executing external commands
1013  */
1014 static int external_cmd(char *cmd)
1015 {
1016         int fds[3] = {-1, -1, -1};
1017
1018         if (cmd_pid)
1019                 return -1;
1020         shutdown_curses();
1021         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1022         cmd_died = 0;
1023         do_select(EXTERNAL_MODE);
1024         init_curses();
1025         return 0;
1026 }
1027
1028 static void print_scroll_msg(void)
1029 {
1030         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1031         int first_rbe = first_visible_rbe(&lines_total);
1032         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1033                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1034 }
1035
1036 static void com_page_down(void)
1037 {
1038         unsigned lines = 0;
1039         int i = scroll_position;
1040         while (lines < bot.lines && --i > 0) {
1041                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1042                 if (!rbe)
1043                         break;
1044                 lines += NUM_LINES(strlen(rbe->msg));
1045         }
1046         if (lines) {
1047                 scroll_position = i;
1048                 redraw_bot_win();
1049                 print_scroll_msg();
1050                 return;
1051         }
1052         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1053 }
1054
1055 static void com_page_up(void)
1056 {
1057         unsigned lines;
1058         int fvr = first_visible_rbe(&lines);
1059         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1060                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1061                 return;
1062         }
1063         scroll_position = fvr + 1;
1064         for (; scroll_position > 0; scroll_position--) {
1065                 fvr = first_visible_rbe(&lines);
1066                 if (lines == bot.lines)
1067                         break;
1068         }
1069         redraw_bot_win();
1070         print_scroll_msg();
1071 }
1072
1073 static void com_scroll_down(void)
1074 {
1075         struct rb_entry *rbe;
1076         int rbe_lines;
1077
1078         if (!scroll_position) {
1079                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1080                 return;
1081         }
1082         scroll_position--;
1083         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1084         rbe_lines = NUM_LINES(rbe->len);
1085         wscrl(bot.win, rbe_lines);
1086         wmove(bot.win, bot.lines - rbe_lines, 0);
1087         wattron(bot.win, COLOR_PAIR(rbe->color));
1088         waddstr(bot.win, rbe->msg);
1089         wrefresh(bot.win);
1090         print_scroll_msg();
1091 }
1092
1093 static void com_scroll_up(void)
1094 {
1095         struct rb_entry *rbe = NULL;
1096         unsigned lines;
1097         int i, first_rbe, num_scroll;
1098
1099         /* the entry that is going to vanish */
1100         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1101         if (!rbe)
1102                 goto err_out;
1103         num_scroll = NUM_LINES(rbe->len);
1104         first_rbe = first_visible_rbe(&lines);
1105         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1106                 goto err_out;
1107         scroll_position++;
1108         wscrl(bot.win, -num_scroll);
1109         i = draw_top_rbe(&lines);
1110         if (i < 0)
1111                 goto err_out;
1112         while (i > 0 && lines < num_scroll) {
1113                 int rbe_lines;
1114                 rbe = ringbuffer_get(bot_win_rb, --i);
1115                 if (!rbe)
1116                         break;
1117                 rbe_lines = NUM_LINES(rbe->len);
1118                 lines += rbe_lines;
1119 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1120                 wattron(bot.win, COLOR_PAIR(rbe->color));
1121                 waddstr(bot.win, "\n");
1122                 waddstr(bot.win, rbe->msg);
1123                 if (!i)
1124                         break;
1125                 i--;
1126         }
1127         wrefresh(bot.win);
1128         print_scroll_msg();
1129         return;
1130 err_out:
1131         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1132 }
1133
1134 static void com_ll_decr(void)
1135 {
1136         if (conf.loglevel_arg <= DEBUG) {
1137                 print_in_bar(COLOR_ERRMSG,
1138                         "loglevel already at maximal verbosity\n");
1139                 return;
1140         }
1141         conf.loglevel_arg--;
1142         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1143 }
1144
1145 static void com_ll_incr(void)
1146 {
1147         if (conf.loglevel_arg >= EMERG) {
1148                 print_in_bar(COLOR_ERRMSG,
1149                         "loglevel already at miminal verbosity\n");
1150                 return;
1151         }
1152         conf.loglevel_arg++;
1153         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1154 }
1155
1156 /*
1157  * reread configuration, terminate on errors
1158  */
1159 static void com_reread_conf(void)
1160 {
1161         char *cf =configfile_exists();
1162         struct gui_cmdline_parser_params params = {
1163                 .override = 1,
1164                 .initialize = 1,
1165                 .check_required = 0,
1166                 .check_ambiguity = 0
1167         };
1168
1169         if (!cf) {
1170                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1171                 return;
1172         }
1173         PARA_INFO_LOG("%s", "rereading command line options and config file");
1174         gui_cmdline_parser(_argc, _argv, &conf);
1175         gui_cmdline_parser_config_file(cf, &conf, &params);
1176         PARA_NOTICE_LOG("%s", "config file reloaded");
1177         if (check_key_map_args() < 0)
1178                 finish(EXIT_FAILURE);
1179 }
1180
1181 static void com_help(void)
1182 {
1183         int i;
1184
1185         for (i = 0; i < conf.key_map_given; ++i) {
1186                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1187                 const char *handler_text = "???", *desc = NULL;
1188
1189                 if (!split_key_map(tmp, &handler, &arg)) {
1190                         free(tmp);
1191                         return;
1192                 }
1193                 switch (*handler) {
1194                         case 'i':
1195                                 handler_text = "internal";
1196                                 desc = command_list[find_cmd_byname(arg)].description;
1197                                 break;
1198                         case 'x': handler_text = "external"; break;
1199                         case 'd': handler_text = "display "; break;
1200                         case 'p': handler_text = "para    "; break;
1201                 }
1202                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1203                         strlen(arg) < 8? "\t" : "",
1204                         desc? desc : "");
1205                 free(tmp);
1206         }
1207         for (i = 0; command_list[i].handler; i++) {
1208                 struct gui_command gc = command_list[i];
1209
1210                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1211                         strlen(gc.name) < 8? "\t" : "",
1212                         gc.description);
1213         }
1214         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1215                 "for more info");
1216 }
1217
1218 static void com_shrink_top_win(void)
1219 {
1220         if (top.lines <= theme.top_lines_min) {
1221                 PARA_WARNING_LOG("%s", "can not decrease top window");
1222                 return;
1223         }
1224         init_wins(top.lines - 1);
1225         wclear(top.win);
1226         print_all_items();
1227         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1228 }
1229
1230 static void com_enlarge_top_win(void)
1231 {
1232         if (bot.lines < 3) {
1233                 PARA_WARNING_LOG("%s", "can not increase top window");
1234                 return;
1235         }
1236         init_wins(top.lines + 1);
1237         wclear(top.win);
1238         print_all_items();
1239         print_in_bar(COLOR_MSG, "increased top window");
1240 }
1241
1242 static void com_version(void)
1243 {
1244         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1245                 CODENAME "\"");
1246 }
1247
1248 static void com_quit(void)
1249 {
1250         finish(0);
1251 }
1252
1253 static void com_refresh(void)
1254 {
1255         shutdown_curses();
1256         init_curses();
1257 }
1258
1259 static void change_theme(int next)
1260 {
1261         if (next)
1262                 next_theme(&theme);
1263         else
1264                 prev_theme(&theme);
1265         /* This seems to be needed twice, why? */
1266         com_refresh();
1267         com_refresh();
1268         PARA_NOTICE_LOG("new theme: %s", theme.name);
1269 }
1270
1271 static void com_next_theme(void)
1272 {
1273         change_theme(1);
1274 }
1275
1276 static void com_prev_theme(void)
1277 {
1278         change_theme(0);
1279 }
1280
1281
1282 static void handle_command(int c)
1283 {
1284         int i;
1285
1286         /* first check user's key bindings */
1287         for (i = 0; i < conf.key_map_given; ++i) {
1288                 char tmp[MAXLINE], *handler, *arg;
1289
1290                 strcpy(tmp, conf.key_map_arg[i]);
1291                 if (!split_key_map(tmp, &handler, &arg))
1292                         return;
1293                 if (!strcmp(tmp, km_keyname(c))) {
1294                         if (*handler == 'd') {
1295                                 display_cmd(arg);
1296                                 return;
1297                         }
1298                         if (*handler == 'x') {
1299                                 external_cmd(arg);
1300                                 return;
1301                         }
1302                         if (*handler == 'p') {
1303                                 client_cmd_cmdline(arg);
1304                                 return;
1305                         }
1306                         if (*handler == 'i') {
1307                                 int num = find_cmd_byname(arg);
1308                                 if (num >= 0)
1309                                         command_list[num].handler();
1310                                 return;
1311                         }
1312                 }
1313         }
1314         /* not found, check internal key bindings */
1315         for (i = 0; command_list[i].handler; i++) {
1316                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1317                         command_list[i].handler();
1318                         return;
1319                 }
1320         }
1321         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1322                 km_keyname(c));
1323 }
1324
1325 int main(int argc, char *argv[])
1326 {
1327         int ret;
1328         char *cf;
1329
1330         _argc = argc;
1331         _argv = argv;
1332
1333         if (gui_cmdline_parser(argc, argv, &conf)) {
1334                 fprintf(stderr, "parse error while reading command line\n");
1335                 exit(EXIT_FAILURE);
1336         }
1337         HANDLE_VERSION_FLAG("gui", conf);
1338         init_theme(0, &theme);
1339         top.lines = theme.top_lines_default;
1340         if (check_key_map_args() < 0) {
1341                 fprintf(stderr, "invalid key map\n");
1342                 exit(EXIT_FAILURE);
1343         }
1344         cf = configfile_exists();
1345         if (!cf && conf.config_file_given) {
1346                 fprintf(stderr, "can not read config file %s\n",
1347                         conf.config_file_arg);
1348                 exit(EXIT_FAILURE);
1349         }
1350         if (cf) {
1351                 struct gui_cmdline_parser_params params = {
1352                         .override = 0,
1353                         .initialize = 0,
1354                         .check_required = 0,
1355                         .check_ambiguity = 0
1356                 };
1357                 gui_cmdline_parser_config_file(cf, &conf, &params);
1358         }
1359         if (check_key_map_args() < 0) {
1360                 fprintf(stderr, "invalid key map in config file\n");
1361                 exit(EXIT_FAILURE);
1362         }
1363         setup_signal_handling();
1364         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1365         initscr(); /* needed only once, always successful */
1366         init_curses();
1367         print_welcome();
1368         for (;;) {
1369                 print_status_bar();
1370                 ret = do_select(GETCH_MODE);
1371                 if (!ret)
1372                         continue;
1373                 print_in_bar(COLOR_MSG, " ");
1374                 handle_command(ret);
1375         }
1376 }