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