gui.c

   1 /*
   2  * Copyright (C) 1998-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file gui.c ncurses-based interface for paraslash */
  20
  21 #include "gui.cmdline.h"
  22 #include "para.h"
  23 #include <curses.h>
  24 #include "ringbuffer.h"
  25 #include "string.h"
  26
  27 extern const char *status_item_list[NUM_STAT_ITEMS];
  28 static char *stat_content[NUM_STAT_ITEMS];
  29
  30 #define STANDARD_STATUS_BAR "para_gui " VERSION " (hit ? for help)"
  31
  32 static int signal_pipe;
  33
  34 static void finish(int sig);
  35
  36 static struct win_data {
  37         WINDOW *win;
  38         NCURSES_SIZE_T begx;
  39         NCURSES_SIZE_T begy;
  40         NCURSES_SIZE_T cols;
  41         NCURSES_SIZE_T lines;
  42 } top, bot, sb, in, sep;
  43
  44 #define RINGBUFFER_SIZE 512
  45 struct rb_entry {
  46         char *msg;
  47         size_t len;
  48         int color;
  49 };
  50 void *bot_win_rb;
  51 #define NUM_LINES(len) (1 + (len) / bot.cols)
  52
  53 static unsigned scroll_position;
  54
  55 static int external_cmd_died, curses_active;
  56 static pid_t external_cmd_pid;
  57
  58 static int command_pipe = -1;
  59 static int audiod_pipe = -1;
  60 static struct gengetopt_args_info conf;
  61
  62 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  63
  64
  65 #define COLOR_STATUSBAR 32
  66 #define COLOR_COMMAND 33
  67 #define COLOR_OUTPUT 34
  68 #define COLOR_MSG 35
  69 #define COLOR_ERRMSG 36
  70 #define COLOR_WELCOME 37
  71 #define COLOR_SEPARATOR 38
  72 #define COLOR_TOP 39
  73 #define COLOR_BOT 40
  74
  75 struct gui_command {
  76         const char *key;
  77         const char *name;
  78         const char *description;
  79         void (*handler)(void);
  80 };
  81
  82 struct stat_item {
  83         char name[MAXLINE];
  84         char prefix[MAXLINE];
  85         char postfix[MAXLINE];
  86         unsigned y;
  87         unsigned x;
  88         unsigned len;
  89         int fg, bg;
  90         int align;
  91         char content[MAXLINE];
  92 };
  93
  94 static struct gui_theme theme;
  95
  96 int _argc;
  97 char **_argv;
  98
  99 static void com_help(void);
 100 static void com_reread_conf(void);
 101 static void com_enlarge_top_win(void);
 102 static void com_shrink_top_win(void);
 103 static void com_version(void);
 104 static void com_quit(void);
 105 static void com_refresh(void);
 106 static void com_ll_incr(void);
 107 static void com_ll_decr(void);
 108 static void com_prev_theme(void);
 109 static void com_next_theme(void);
 110 static void com_scroll_up(void);
 111 static void com_scroll_down(void);
 112 static void com_page_up(void);
 113 static void com_page_down(void);
 114
 115 struct gui_command command_list[] = {
 116         {
 117                 .key = "?",
 118                 .name = "help",
 119                 .description = "print help",
 120                 .handler = com_help
 121         }, {
 122                 .key = "+",
 123                 .name = "enlarge_win",
 124                 .description = "enlarge the top window",
 125                 .handler = com_enlarge_top_win
 126         }, {
 127                 .key = "-",
 128                 .name = "shrink_win",
 129                 .description = "shrink the top window",
 130                 .handler = com_shrink_top_win
 131         }, {
 132                 .key = "r",
 133                 .name = "reread_conf",
 134                 .description = "reread configuration file",
 135                 .handler = com_reread_conf
 136         }, {
 137                 .key = "q",
 138                 .name = "quit",
 139                 .description = "exit para_gui",
 140                 .handler = com_quit
 141         }, {
 142                 .key = "^L",
 143                 .name = "refresh",
 144                 .description = "redraw the screen",
 145                 .handler = com_refresh
 146         }, {
 147                 .key = ".",
 148                 .name = "next_theme",
 149                 .description = "switch to next theme",
 150                 .handler = com_next_theme
 151         }, {
 152                 .key = ",",
 153                 .name = "prev_theme",
 154                 .description = "switch to previous stream",
 155                 .handler = com_prev_theme
 156         }, {
 157                 .key = ">",
 158                 .name = "ll_incr",
 159                 .description = "increase loglevel (decreases verbosity)",
 160                 .handler = com_ll_incr
 161         }, {
 162                 .key = "<",
 163                 .name = "ll_decr",
 164                 .description = "decrease loglevel (increases verbosity)",
 165                 .handler = com_ll_decr
 166         }, {
 167                 .key = "V",
 168                 .name = "version",
 169                 .description = "show the para_gui version",
 170                 .handler = com_version
 171         }, {
 172                 .key = "<up>",
 173                 .name = "scroll_up",
 174                 .description = "scroll up one line",
 175                 .handler = com_scroll_up
 176         }, {
 177                 .key = "<down>",
 178                 .name = "scroll_down",
 179                 .description = "scroll down one line",
 180                 .handler = com_scroll_down
 181         }, {
 182                 .key = "<ppage>",
 183                 .name = "page_up",
 184                 .description = "scroll up one page",
 185                 .handler = com_page_up
 186         }, {
 187                 .key = "<npage>",
 188                 .name = "page_down",
 189                 .description = "scroll down one page",
 190                 .handler = com_page_down
 191         }, {
 192                 .handler = NULL
 193         }
 194 };
 195
 196 static int find_cmd_byname(char *name)
 197 {
 198         int i;
 199
 200         for (i = 0; command_list[i].handler; i++)
 201                 if (!strcmp(command_list[i].name, name))
 202                         return i;
 203         return -1;
 204 }
 205
 206 /* taken from mutt */
 207 static char *km_keyname(int c)
 208 {
 209         static char buf[10];
 210
 211         if (c == KEY_UP) {
 212                 sprintf(buf, "<up>");
 213                 return buf;
 214         }
 215         if (c == KEY_DOWN) {
 216                 sprintf(buf, "<down>");
 217                 return buf;
 218         }
 219         if (c == KEY_LEFT) {
 220                 sprintf(buf, "<left>");
 221                 return buf;
 222         }
 223         if (c == KEY_RIGHT) {
 224                 sprintf(buf, "<right>");
 225                 return buf;
 226         }
 227         if (c == KEY_NPAGE) {
 228                 sprintf(buf, "<npage>");
 229                 return buf;
 230         }
 231         if (c == KEY_PPAGE) {
 232                 sprintf(buf, "<ppage>");
 233                 return buf;
 234         }
 235         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 236                 if (c < 0)
 237                         c += 256;
 238                 if (c < 128) {
 239                         buf[0] = '^';
 240                         buf[1] = (c + '@') & 0x7f;
 241                         buf[2] = 0;
 242                 } else
 243                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 244                                 (c >> 3) & 7, c & 7);
 245         } else if (c >= KEY_F0 && c < KEY_F(256))
 246                 sprintf(buf, "<F%d>", c - KEY_F0);
 247         else if (isprint(c))
 248                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 249         else
 250                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 251         return buf;
 252 }
 253
 254 static char *configfile_exists(void)
 255 {
 256         static char *config_file;
 257         char *tmp;
 258
 259         if (!conf.config_file_given) {
 260                 if (!config_file) {
 261                         char *home = para_homedir();
 262                         config_file = make_message("%s/.paraslash/gui.conf",
 263                                 home);
 264                         free(home);
 265                 }
 266                 tmp = config_file;
 267         } else
 268                 tmp = conf.config_file_arg;
 269         return file_exists(tmp)? tmp: NULL;
 270 }
 271
 272 /*
 273  * print num spaces to curses window
 274  */
 275 static void add_spaces(WINDOW* win, unsigned int num)
 276 {
 277         while (num > 0) {
 278                 num--;
 279                 waddstr(win, " ");
 280         }
 281 }
 282
 283 /*
 284  * print aligned string to curses window. This function always prints
 285  * exactly len chars.
 286  */
 287 static int align_str(WINDOW* win, const char *string, unsigned int len,
 288                 unsigned int align)
 289 {
 290         int num; /* of spaces */
 291         char *str;
 292
 293         if (!win || !string)
 294                 return -1;
 295         num = len - strlen(string);
 296         str = para_strdup(string);
 297         if (num < 0) {
 298                 str[len] = '\0';
 299                 num = 0;
 300         }
 301         if (align == LEFT) {
 302                 waddstr(win, str);
 303                 add_spaces(win, num);
 304         } else if (align == RIGHT) {
 305                 add_spaces(win, num);
 306                 waddstr(win, str);
 307         } else {
 308                 add_spaces(win, num / 2);
 309                 waddstr(win, str[0]? str: "");
 310                 add_spaces(win, num - num / 2);
 311         }
 312         free(str);
 313         return 1;
 314 }
 315
 316 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 317 {
 318         char *msg;
 319
 320         if (!curses_active)
 321                 return;
 322         wattron(in.win, COLOR_PAIR(color));
 323         PARA_VSPRINTF(fmt, msg);
 324         wmove(in.win, 0, 0);
 325         align_str(in.win, msg, sb.cols, LEFT);
 326         free(msg);
 327         wrefresh(in.win);
 328 }
 329
 330 /*
 331  * update the status bar
 332  */
 333 static void print_status_bar(void)
 334 {
 335         if (!curses_active)
 336                 return;
 337         wmove(sb.win, 0, 0);
 338         align_str(sb.win,STANDARD_STATUS_BAR, sb.cols, CENTER);
 339         wrefresh(sb.win);
 340 }
 341
 342 /*
 343  * get the number of the oldest rbe that is (partially) visible. On return,
 344  * lines contains the sum of the number of lines of all visable entries. If the
 345  * first one is only partially visible, lines is greater than bot.lines.
 346  */
 347 static int first_visible_rbe(unsigned *lines)
 348 {
 349         int i;
 350         *lines = 0;
 351         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 352                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 353                 int rbe_lines;
 354                 if (!rbe)
 355                         return i - 1;
 356 //              fprintf(stderr, "found: %s\n", rbe->msg);
 357                 rbe_lines = NUM_LINES(rbe->len);
 358                 if (rbe_lines > bot.lines)
 359                         return -1;
 360                 *lines += rbe_lines;
 361                 if (*lines >= bot.lines)
 362                         return i;
 363         }
 364         return RINGBUFFER_SIZE - 1;
 365 }
 366
 367 static int draw_top_rbe(unsigned *lines)
 368 {
 369         unsigned len;
 370         int offset, fvr = first_visible_rbe(lines);
 371         struct rb_entry *rbe;
 372
 373         if (fvr < 0)
 374                 return -1;
 375         wmove(bot.win, 0, 0);
 376         rbe = ringbuffer_get(bot_win_rb, fvr);
 377         if (!rbe)
 378                 return -1;
 379         /* first rbe might be only partially visible */
 380         offset = (*lines - bot.lines) * bot.cols;
 381         len = strlen(rbe->msg);
 382         if (offset < 0 || len < offset)
 383                 return -1;
 384         wattron(bot.win, COLOR_PAIR(rbe->color));
 385         waddstr(bot.win, rbe->msg + offset);
 386         *lines = NUM_LINES(len - offset);
 387         return fvr;
 388 }
 389
 390 static void redraw_bot_win(void)
 391 {
 392         unsigned lines;
 393         int i;
 394
 395         wmove(bot.win, 0, 0);
 396         wclear(bot.win);
 397         i = draw_top_rbe(&lines);
 398         if (i <= 0)
 399                 goto out;
 400         while (i > 0 && lines < bot.lines) {
 401                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 402                 if (!rbe) {
 403                         lines++;
 404                         waddstr(bot.win, "\n");
 405                         continue;
 406                 }
 407                 lines += NUM_LINES(rbe->len);
 408                 wattron(bot.win, COLOR_PAIR(rbe->color));
 409                 waddstr(bot.win, "\n");
 410                 waddstr(bot.win, rbe->msg);
 411         }
 412 out:
 413         wrefresh(bot.win);
 414 }
 415
 416 static void rb_add_entry(int color, char *msg)
 417 {
 418         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 419         int x, y;
 420         new->color = color;
 421         new->len = strlen(msg);
 422         new->msg = msg;
 423         old = ringbuffer_add(bot_win_rb, new);
 424 //      fprintf(stderr, "added: %s\n", new->msg);
 425         if (old) {
 426                 free(old->msg);
 427                 free(old);
 428         }
 429         if (scroll_position) {
 430                 /* discard current scrolling, like xterm does */
 431                 scroll_position = 0;
 432                 redraw_bot_win();
 433                 return;
 434         }
 435         wattron(bot.win, COLOR_PAIR(color));
 436         getyx(bot.win, y, x);
 437         if (y || x)
 438                 waddstr(bot.win, "\n");
 439         waddstr(bot.win, msg);
 440 }
 441
 442 /*
 443  * print formated output to bot win and refresh
 444  */
 445 __printf_2_3 static void outputf(int color, const char* fmt,...)
 446 {
 447         char *msg;
 448
 449         if (!curses_active)
 450                 return;
 451         PARA_VSPRINTF(fmt, msg);
 452         rb_add_entry(color, msg);
 453         wrefresh(bot.win);
 454 }
 455
 456 static void add_output_line(char *line)
 457 {
 458         if (!curses_active)
 459                 return;
 460         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 461 }
 462
 463 void para_log(int ll, const char *fmt,...)
 464 {
 465         int color;
 466         char *msg;
 467
 468         if (ll < conf.loglevel_arg || !curses_active)
 469                 return;
 470         switch (ll) {
 471                 case DEBUG:
 472                 case INFO:
 473                 case NOTICE:
 474                         color = COLOR_MSG;
 475                         break;
 476                 default:
 477                         color = COLOR_ERRMSG;
 478         }
 479         PARA_VSPRINTF(fmt, msg);
 480         chop(msg);
 481         rb_add_entry(color, msg);
 482         wrefresh(bot.win);
 483 }
 484
 485 static void setup_signal_handling(void)
 486 {
 487         signal_pipe = para_signal_init();
 488         para_install_sighandler(SIGINT);
 489         para_install_sighandler(SIGTERM);
 490         para_install_sighandler(SIGCHLD);
 491         para_install_sighandler(SIGWINCH);
 492         para_install_sighandler(SIGUSR1);
 493         signal(SIGPIPE, SIG_IGN);
 494         signal(SIGHUP, SIG_IGN);
 495 }
 496
 497 static void do_exit(int ret)
 498 {
 499         signal(SIGTERM, SIG_IGN);
 500         kill(0, SIGTERM);
 501         exit(ret);
 502 }
 503
 504 static void shutdown_curses(void)
 505 {
 506         if (!curses_active)
 507                 return;
 508         def_prog_mode();
 509         curses_active = 0;
 510         endwin();
 511 }
 512
 513 static void finish(int ret)
 514 {
 515         shutdown_curses();
 516         do_exit(ret);
 517 }
 518
 519 /*
 520  * exit curses and print given message to stdout/stderr
 521  */
 522 __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 523 {
 524         va_list argp;
 525         FILE *outfd = ret? stderr: stdout;
 526
 527         shutdown_curses();
 528         va_start(argp, fmt);
 529         vfprintf(outfd, fmt, argp);
 530         va_end(argp);
 531         do_exit(ret);
 532 }
 533
 534 static void print_welcome(void)
 535 {
 536         int ll = conf.loglevel_arg;
 537         if (ll > NOTICE)
 538                 return;
 539         outputf(COLOR_WELCOME, "Welcome to para_gui " VERSION
 540                 " \"" CODENAME "\". Theme: %s", theme.name);
 541         wclrtoeol(bot.win);
 542 }
 543
 544 /*
 545  * init all windows
 546  */
 547 static void init_wins(int top_lines)
 548 {
 549         int i;
 550
 551         top.lines = top_lines;
 552         top.cols = COLS;
 553         top.begy = 0;
 554         top.begx = 0;
 555
 556         bot.lines = LINES - top.lines - 3;
 557         bot.cols = COLS;
 558         bot.begy = top.lines + 1;
 559         bot.begx = 0;
 560
 561         sb.lines = 1;
 562         sb.cols = COLS;
 563         sb.begy = LINES - 2;
 564         sb.begx = 0;
 565
 566         in.lines = 1;
 567         in.cols = COLS;
 568         in.begy = LINES - 1;
 569         in.begx = 0;
 570
 571         sep.lines = 1;
 572         sep.cols = COLS;
 573         sep.begy = top.lines;
 574         sep.begx = 0;
 575
 576         assume_default_colors(theme.default_fg, theme.default_bg);
 577         if (top.win) {
 578                 mvwin(top.win, top.begy, top.begx);
 579                 wresize(top.win, top.lines, top.cols);
 580
 581                 mvwin(sb.win, sb.begy, sb.begx);
 582                 wresize(sb.win, sb.lines, sb.cols);
 583
 584                 mvwin(sep.win, sep.begy, sep.begx);
 585                 wresize(sep.win, sep.lines, sep.cols);
 586
 587                 mvwin(bot.win, bot.begy, bot.begx);
 588                 wresize(bot.win, bot.lines, bot.cols);
 589
 590                 mvwin(in.win, in.begy, in.begx);
 591                 wresize(in.win, in.lines, in.cols);
 592         } else {
 593                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 594                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 595                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 596                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 597                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 598                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 599                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 600                 wclear(bot.win);
 601                 wclear(sb.win);
 602                 wclear(in.win);
 603                 scrollok(bot.win, 1);
 604                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 605                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 606                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 607                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 608                 nodelay(top.win, 1);
 609                 nodelay(bot.win, 1);
 610                 nodelay(sb.win, 1);
 611                 nodelay(in.win, 0);
 612
 613                 keypad(top.win, 1);
 614                 keypad(bot.win, 1);
 615                 keypad(sb.win, 1);
 616                 keypad(in.win, 1);
 617                 print_status_bar();
 618         }
 619         wmove(sep.win, 0, 0);
 620         for (i = 1; i <= COLS; i++)
 621                 waddstr(sep.win, theme.sep_str);
 622         wclear(top.win);
 623         //wclear(bot.win);
 624         wnoutrefresh(top.win);
 625         wnoutrefresh(bot.win);
 626         //wnoutrefresh(sb.win);
 627         print_status_bar();
 628         wnoutrefresh(in.win);
 629         wnoutrefresh(sep.win);
 630         doupdate();
 631 }
 632
 633 static void check_geometry(void)
 634 {
 635         if (LINES < theme.lines_min || COLS < theme.cols_min)
 636                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 637                         " (need at least %dx%d)\n", COLS, LINES,
 638                         theme.cols_min, theme.lines_min);
 639 }
 640
 641 /*
 642  * Print stat item #i to curses window
 643  */
 644 static void print_stat_item(int i)
 645 {
 646         char *tmp;
 647         struct stat_item_data d = theme.data[i];
 648         char *c = stat_content[i];
 649
 650         if (!curses_active || !d.len || !c)
 651                 return;
 652         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 653 //      PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
 654         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 655         wrefresh(top.win);
 656         wattron(top.win, COLOR_PAIR(i + 1));
 657         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 658         free(tmp);
 659         wrefresh(top.win);
 660 }
 661
 662 static void print_all_items(void)
 663 {
 664         int i;
 665
 666         if (!curses_active)
 667                 return;
 668         for (i = 0; i < NUM_STAT_ITEMS; i++)
 669                 print_stat_item(i);
 670 }
 671 static void clear_all_items(void)
 672 {
 673         int i;
 674
 675         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 676                 free(stat_content[i]);
 677                 stat_content[i] = para_strdup("");
 678         }
 679 }
 680
 681 static void init_colors(void)
 682 {
 683         int i;
 684         if (!has_colors())
 685                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 686         start_color();
 687         for (i = 0; i < NUM_STAT_ITEMS; 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         pid_t pid;
 730 reap_next_child:
 731         pid = para_reap_child();
 732         if (pid <= 0)
 733                 return;
 734         if (pid == external_cmd_pid) {
 735                 external_cmd_pid = 0;
 736                 external_cmd_died = 1;
 737         }
 738         goto reap_next_child;
 739 }
 740
 741 /*
 742  * print status line if line starts with known command.
 743  */
 744 static void check_stat_line(char *line)
 745 {
 746         int i;
 747
 748 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 749         i = stat_line_valid(line);
 750         if (i >= 0) {
 751                 line += strlen(status_item_list[i]) + 1;
 752                 free(stat_content[i]);
 753                 stat_content[i] = para_strdup(line);
 754                 print_stat_item(i);
 755         }
 756         return;
 757 }
 758
 759 /*
 760  * This sucker modifies its first argument. *handler and *arg are
 761  * pointers to 0-terminated strings (inside line). Crap.
 762  */
 763 static int split_key_map(char *line, char **handler, char **arg)
 764 {
 765         if (!(*handler = strchr(line + 1, ':')))
 766                 goto err_out;
 767         **handler = '\0';
 768         (*handler)++;
 769         if (!(*arg = strchr(*handler, ':')))
 770                 goto err_out;
 771         **arg = '\0';
 772         (*arg)++;
 773         return 1;
 774 err_out:
 775         return 0;
 776 }
 777
 778 static int check_key_map_args(void)
 779 {
 780         char *s;
 781         int i, ret = -1;
 782         char *tmp = NULL, *handler, *arg;
 783
 784         for (i = 0; i < conf.key_map_given; ++i) {
 785                 s = conf.key_map_arg[i];
 786                 if (!(*s))
 787                         goto err_out;
 788                 free(tmp);
 789                 tmp = para_strdup(s);
 790                 if (!split_key_map(tmp, &handler, &arg))
 791                         goto err_out;
 792                 if (strlen(handler) != 1)
 793                         goto err_out;
 794                 if (*handler != 'x'
 795                         && *handler != 'd'
 796                         && *handler != 'i'
 797                         && *handler != 'p')
 798                         goto err_out;
 799                 if (*handler != 'i')
 800                         continue;
 801                 if (find_cmd_byname(arg) < 0)
 802                         goto err_out;
 803         }
 804         ret = 0;
 805 err_out:
 806         free(tmp);
 807         return ret;
 808 }
 809
 810 /*
 811  * React to various signal-related events
 812  */
 813 static void handle_signal(int sig)
 814 {
 815         switch (sig) {
 816         case SIGTERM:
 817                 msg_n_exit(EXIT_FAILURE,
 818                         "only the good die young (caught SIGTERM))\n");
 819                 return;
 820         case SIGWINCH:
 821                 if (curses_active) {
 822                         shutdown_curses();
 823                         init_curses();
 824                         redraw_bot_win();
 825                 }
 826                 return;
 827         case SIGINT:
 828                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 829                 /* Nothing to do. SIGINT killed our child, para_client stat.
 830                  * This get noticed by do_select which resets everything
 831                  */
 832                 return;
 833         case SIGUSR1:
 834                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 835                 com_reread_conf();
 836                 return;
 837         case SIGCHLD:
 838                 check_sigchld();
 839                 return;
 840         }
 841 }
 842
 843 static int open_audiod_pipe(void)
 844 {
 845         static int init = 1;
 846
 847         if (init)
 848                 init = 0;
 849         else
 850                 sleep(1);
 851         return para_open_audiod_pipe(conf.stat_cmd_arg);
 852 }
 853
 854 /*
 855  * This is the core select loop. Besides the (internal) signal
 856  * pipe, the following other fds are checked according to the mode:
 857  *
 858  * GETCH_MODE: check stdin, return when key is pressed
 859  *
 860  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 861  * of output has been read or when other end has closed command pipe or
 862  * when any key is pressed.
 863  *
 864  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 865  * is running. During that thime curses is disabled.  Returns when
 866  * external_cmd_pid == 0.
 867  */
 868 static int do_select(int mode)
 869 {
 870         fd_set rfds;
 871         int ret;
 872         int max_fileno, cp_numread = 1;
 873         char command_buf[STRINGSIZE] = "";
 874         int cbo = 0; /* command buf offset */
 875         struct timeval tv;
 876 repeat:
 877         tv.tv_sec = conf.timeout_arg  / 1000;
 878         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 879 //      ret = refresh_status();
 880         FD_ZERO(&rfds);
 881         max_fileno = 0;
 882         /* audiod pipe */
 883         if (audiod_pipe < 0)
 884                 audiod_pipe = open_audiod_pipe();
 885         if (audiod_pipe >= 0) {
 886                 FD_SET(audiod_pipe, &rfds);
 887                 max_fileno = MAX(max_fileno, audiod_pipe);
 888         }
 889
 890         /* signal pipe */
 891         FD_SET(signal_pipe, &rfds);
 892         max_fileno = MAX(max_fileno, signal_pipe);
 893         /* command pipe only for COMMAND_MODE */
 894         if (command_pipe >= 0 && mode == COMMAND_MODE) {
 895                 FD_SET(command_pipe, &rfds);
 896                 max_fileno = MAX(max_fileno, command_pipe);
 897         }
 898         if (curses_active)
 899                 FD_SET(STDIN_FILENO, &rfds);
 900         ret = select(max_fileno + 1, &rfds, NULL, NULL, &tv);
 901 //      PARA_DEBUG_LOG("select returned %d\n", ret);
 902
 903         /* signals */
 904         if (FD_ISSET(signal_pipe, &rfds)) {
 905                 int sig_nr = para_next_signal();
 906                 if (sig_nr > 0)
 907                         handle_signal(sig_nr);
 908         }
 909         if (ret <= 0)
 910                 goto check_return; /* skip fd checks */
 911         /* read command pipe if ready */
 912         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 913                         FD_ISSET(command_pipe, &rfds)) {
 914                 cp_numread = read(command_pipe, command_buf + cbo,
 915                         STRINGSIZE - 1 - cbo);
 916                 if (cp_numread >= 0)
 917                         cbo += cp_numread;
 918                 else {
 919                         if (cp_numread < 0)
 920                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 921                         close(command_pipe);
 922                         command_pipe = -1;
 923                 }
 924         }
 925         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 926                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 927                         close(audiod_pipe);
 928                         audiod_pipe = -1;
 929                         clear_all_items();
 930                         free(stat_content[SI_STATUS_BAR]);
 931                         stat_content[SI_STATUS_BAR] =
 932                                 para_strdup("audiod not running!?");
 933                         print_all_items();
 934                 }
 935 check_return:
 936         switch (mode) {
 937         case COMMAND_MODE:
 938                 if (cp_numread <= 0 && !cbo) /* command complete */
 939                         return 0;
 940                 if (cbo)
 941                         cbo = for_each_line(command_buf, cbo, &add_output_line);
 942                 if (cp_numread <= 0)
 943                         cbo = 0;
 944                 wrefresh(bot.win);
 945                 break;
 946         case GETCH_MODE:
 947                 ret = wgetch(top.win);
 948                 if (ret != ERR && ret != KEY_RESIZE)
 949                         return ret;
 950                 break;
 951         case EXTERNAL_MODE:
 952                 if (external_cmd_died) {
 953                         external_cmd_died = 0;
 954                         return 0;
 955                 }
 956         }
 957         goto repeat;
 958 }
 959
 960 /*
 961  * read from command pipe and print data to bot window
 962  */
 963 static int send_output(void)
 964 {
 965         if (command_pipe < 0)
 966                 return 0;
 967         if (do_select(COMMAND_MODE) >= 0)
 968                 PARA_INFO_LOG("%s", "command complete");
 969         else
 970                 PARA_NOTICE_LOG("%s", "command aborted");
 971         print_in_bar(COLOR_MSG, " ");
 972         return 1;
 973 }
 974
 975 static int client_cmd_cmdline(char *cmd)
 976 {
 977         pid_t pid;
 978         int ret, fds[3] = {0, 1, 0};
 979         char *c = make_message(BINDIR "/para_client %s", cmd);
 980
 981         outputf(COLOR_COMMAND, "%s", c);
 982         print_in_bar(COLOR_MSG, "executing client command, hit q to abort\n");
 983         ret = para_exec_cmdline_pid(&pid, c, fds);
 984         free(c);
 985         if (ret < 0)
 986                 return -1;
 987         command_pipe = fds[1];
 988         return send_output();
 989 }
 990
 991 /*
 992  * exec command and print output to bot win
 993  */
 994 static int display_cmd(char *cmd)
 995 {
 996         pid_t pid;
 997         int fds[3] = {0, 1, 0};
 998
 999         print_in_bar(COLOR_MSG, "executing display command, hit q to abort");
1000         outputf(COLOR_COMMAND, "%s", cmd);
1001         if (para_exec_cmdline_pid(&pid, cmd, fds) < 0)
1002                 return -1;
1003         command_pipe = fds[1];
1004         return send_output();
1005 }
1006
1007 /*
1008  * shutdown curses and stat pipe before executing external commands
1009  */
1010 static int external_cmd(char *cmd)
1011 {
1012         int fds[3] = {-1, -1, -1};
1013
1014         if (external_cmd_pid)
1015                 return -1;
1016         shutdown_curses();
1017         para_exec_cmdline_pid(&external_cmd_pid, cmd, fds);
1018         do_select(EXTERNAL_MODE);
1019         init_curses();
1020         return 0;
1021 }
1022
1023 static void print_scroll_msg(void)
1024 {
1025         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1026         int first_rbe = first_visible_rbe(&lines_total);
1027         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1028                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1029 }
1030
1031 static void com_page_down(void)
1032 {
1033         unsigned lines = 0;
1034         int i = scroll_position;
1035         while (lines < bot.lines && --i > 0) {
1036                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1037                 if (!rbe)
1038                         break;
1039                 lines += NUM_LINES(strlen(rbe->msg));
1040         }
1041         if (lines) {
1042                 scroll_position = i;
1043                 redraw_bot_win();
1044                 print_scroll_msg();
1045                 return;
1046         }
1047         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1048 }
1049
1050 static void com_page_up(void)
1051 {
1052         unsigned lines;
1053         int fvr = first_visible_rbe(&lines);
1054         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1055                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1056                 return;
1057         }
1058         scroll_position = fvr + 1;
1059         for (; scroll_position > 0; scroll_position--) {
1060                 fvr = first_visible_rbe(&lines);
1061                 if (lines == bot.lines)
1062                         break;
1063         }
1064         redraw_bot_win();
1065         print_scroll_msg();
1066 }
1067
1068 static void com_scroll_down(void)
1069 {
1070         struct rb_entry *rbe;
1071         int rbe_lines;
1072
1073         if (!scroll_position) {
1074                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1075                 return;
1076         }
1077         scroll_position--;
1078         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1079         rbe_lines = NUM_LINES(rbe->len);
1080         wscrl(bot.win, rbe_lines);
1081         wmove(bot.win, bot.lines - rbe_lines, 0);
1082         wattron(bot.win, COLOR_PAIR(rbe->color));
1083         waddstr(bot.win, rbe->msg);
1084         wrefresh(bot.win);
1085         print_scroll_msg();
1086 }
1087
1088 static void com_scroll_up(void)
1089 {
1090         struct rb_entry *rbe = NULL;
1091         unsigned lines;
1092         int i, first_rbe, scroll;
1093
1094         /* the entry that is going to vanish */
1095         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1096         if (!rbe)
1097                 goto err_out;
1098         scroll = NUM_LINES(rbe->len);
1099         first_rbe = first_visible_rbe(&lines);
1100         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1101                 goto err_out;
1102         scroll_position++;
1103         wscrl(bot.win, -scroll);
1104         i = draw_top_rbe(&lines);
1105         if (i < 0)
1106                 goto err_out;
1107         while (i > 0 && lines < scroll) {
1108                 int rbe_lines;
1109                 rbe = ringbuffer_get(bot_win_rb, --i);
1110                 if (!rbe)
1111                         break;
1112                 rbe_lines = NUM_LINES(rbe->len);
1113                 lines += rbe_lines;
1114 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1115                 wattron(bot.win, COLOR_PAIR(rbe->color));
1116                 waddstr(bot.win, "\n");
1117                 waddstr(bot.win, rbe->msg);
1118                 if (!i)
1119                         break;
1120                 i--;
1121         }
1122         wrefresh(bot.win);
1123         print_scroll_msg();
1124         return;
1125 err_out:
1126         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1127 }
1128
1129 static void com_ll_decr(void)
1130 {
1131         if (conf.loglevel_arg <= DEBUG) {
1132                 print_in_bar(COLOR_ERRMSG,
1133                         "loglevel already at maximal verbosity\n");
1134                 return;
1135         }
1136         conf.loglevel_arg--;
1137         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1138 }
1139
1140 static void com_ll_incr(void)
1141 {
1142         if (conf.loglevel_arg >= EMERG) {
1143                 print_in_bar(COLOR_ERRMSG,
1144                         "loglevel already at miminal verbosity\n");
1145                 return;
1146         }
1147         conf.loglevel_arg++;
1148         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1149 }
1150
1151 /*
1152  * reread configuration, terminate on errors
1153  */
1154 static void com_reread_conf(void)
1155 {
1156         char *cf =configfile_exists();
1157
1158         if (!cf) {
1159                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1160                 return;
1161         }
1162         PARA_INFO_LOG("%s", "rereading command line options and config file");
1163         cmdline_parser(_argc, _argv, &conf);
1164         cmdline_parser_configfile(cf, &conf, 1, 1, 0);
1165         PARA_NOTICE_LOG("%s", "configuration read");
1166         if (check_key_map_args() < 0)
1167                 finish(EXIT_FAILURE);
1168 }
1169
1170 static void com_help(void)
1171 {
1172         int i;
1173
1174         for (i = 0; i < conf.key_map_given; ++i) {
1175                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1176                 const char *handler_text = "???", *desc = NULL;
1177
1178                 if (!split_key_map(tmp, &handler, &arg)) {
1179                         free(tmp);
1180                         return;
1181                 }
1182                 switch (*handler) {
1183                         case 'i':
1184                                 handler_text = "internal";
1185                                 desc = command_list[find_cmd_byname(arg)].description;
1186                                 break;
1187                         case 'x': handler_text = "external"; break;
1188                         case 'd': handler_text = "display "; break;
1189                         case 'p': handler_text = "para    "; break;
1190                 }
1191                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1192                         strlen(arg) < 8? "\t" : "",
1193                         desc? desc : "");
1194                 free(tmp);
1195         }
1196         for (i = 0; command_list[i].handler; i++) {
1197                 struct gui_command gc = command_list[i];
1198
1199                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1200                         strlen(gc.name) < 8? "\t" : "",
1201                         gc.description);
1202         }
1203         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1204                 "for more info");
1205 }
1206
1207 static void com_shrink_top_win(void)
1208 {
1209         if (top.lines <= theme.top_lines_min) {
1210                 PARA_WARNING_LOG("%s", "can not decrease top window");
1211                 return;
1212         }
1213         init_wins(top.lines - 1);
1214         wclear(top.win);
1215         print_all_items();
1216         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1217 }
1218
1219 static void com_enlarge_top_win(void)
1220 {
1221         if (bot.lines < 3) {
1222                 PARA_WARNING_LOG("%s", "can not increase top window");
1223                 return;
1224         }
1225         init_wins(top.lines + 1);
1226         wclear(top.win);
1227         print_all_items();
1228         print_in_bar(COLOR_MSG, "increased top window");
1229 }
1230
1231 static void com_version(void)
1232 {
1233         print_in_bar(COLOR_MSG, "para_gui " VERSION " \"" CODENAME "\"");
1234 }
1235
1236 static void com_quit(void)
1237 {
1238         finish(0);
1239 }
1240
1241 static void com_refresh(void)
1242 {
1243         shutdown_curses();
1244         init_curses();
1245 }
1246
1247 static void change_theme(int next)
1248 {
1249         if (next)
1250                 next_theme(&theme);
1251         else
1252                 prev_theme(&theme);
1253         /* This seems to be needed twice, why? */
1254         com_refresh();
1255         com_refresh();
1256         PARA_NOTICE_LOG("new theme: %s", theme.name);
1257 }
1258
1259 static void com_next_theme(void)
1260 {
1261         change_theme(1);
1262 }
1263
1264 static void com_prev_theme(void)
1265 {
1266         change_theme(0);
1267 }
1268
1269
1270 static void handle_command(int c)
1271 {
1272         int i;
1273
1274         /* first check user's key bindings */
1275         for (i = 0; i < conf.key_map_given; ++i) {
1276                 char tmp[MAXLINE], *handler, *arg;
1277
1278                 strcpy(tmp, conf.key_map_arg[i]);
1279                 if (!split_key_map(tmp, &handler, &arg))
1280                         return;
1281                 if (!strcmp(tmp, km_keyname(c))) {
1282                         if (*handler == 'd') {
1283                                 display_cmd(arg);
1284                                 return;
1285                         }
1286                         if (*handler == 'x') {
1287                                 external_cmd(arg);
1288                                 return;
1289                         }
1290                         if (*handler == 'p') {
1291                                 client_cmd_cmdline(arg);
1292                                 return;
1293                         }
1294                         if (*handler == 'i') {
1295                                 int num = find_cmd_byname(arg);
1296                                 if (num >= 0)
1297                                         command_list[num].handler();
1298                                 return;
1299                         }
1300                 }
1301         }
1302         /* not found, check internal key bindings */
1303         for (i = 0; command_list[i].handler; i++) {
1304                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1305                         command_list[i].handler();
1306                         return;
1307                 }
1308         }
1309         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1310                 km_keyname(c));
1311 }
1312
1313 int main(int argc, char *argv[])
1314 {
1315         int ret;
1316         char *cf;
1317
1318         _argc = argc;
1319         _argv = argv;
1320
1321         if (cmdline_parser(argc, argv, &conf)) {
1322                 fprintf(stderr, "parse error while reading command line\n");
1323                 exit(EXIT_FAILURE);
1324         }
1325         init_theme(0, &theme);
1326         top.lines = theme.top_lines_default;
1327         if (check_key_map_args() < 0) {
1328                 fprintf(stderr, "invalid key map\n");
1329                 exit(EXIT_FAILURE);
1330         }
1331         cf = configfile_exists();
1332         if (!cf && conf.config_file_given) {
1333                 fprintf(stderr, "can not read config file %s\n",
1334                         conf.config_file_arg);
1335                 exit(EXIT_FAILURE);
1336         }
1337         if (cf)
1338                 cmdline_parser_configfile(cf, &conf, 0, 0, 0);
1339         if (check_key_map_args() < 0) {
1340                 fprintf(stderr, "invalid key map in config file\n");
1341                 exit(EXIT_FAILURE);
1342         }
1343         setup_signal_handling();
1344         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1345         initscr(); /* needed only once, always successful */
1346         init_curses();
1347         print_welcome();
1348         for (;;) {
1349                 print_status_bar();
1350                 ret = do_select(GETCH_MODE);
1351                 if (!ret)
1352                         continue;
1353                 print_in_bar(COLOR_MSG, " ");
1354                 handle_command(ret);
1355         }
1356 }