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