gui.c

   1 /*
   2  * Copyright (C) 1998-2009 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c Curses-based interface for paraslash. */
   8
   9 #include <signal.h>
  10 #include <sys/types.h>
  11 #include <dirent.h>
  12 #include "gui.cmdline.h"
  13 #include "para.h"
  14 #include "gui.h"
  15 #include "string.h"
  16 #include <curses.h>
  17 #include "ringbuffer.h"
  18 #include "fd.h"
  19 #include "error.h"
  20 #include "list.h"
  21 #include "sched.h"
  22 #include "signal.h"
  23
  24 /** define the array of error lists needed by para_gui */
  25 INIT_GUI_ERRLISTS;
  26 static char *stat_content[NUM_STAT_ITEMS];
  27
  28 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  29
  30 static int signal_pipe;
  31
  32 static struct win_data {
  33         WINDOW *win;
  34         NCURSES_SIZE_T begx;
  35         NCURSES_SIZE_T begy;
  36         NCURSES_SIZE_T cols;
  37         NCURSES_SIZE_T lines;
  38 } top, bot, sb, in, sep;
  39
  40 #define RINGBUFFER_SIZE 512
  41 struct rb_entry {
  42         char *msg;
  43         size_t len;
  44         int color;
  45 };
  46 struct ringbuffer *bot_win_rb;
  47 #define NUM_LINES(len) (1 + (len) / bot.cols)
  48
  49 static unsigned scroll_position;
  50
  51 static int cmd_died, curses_active;
  52 static pid_t cmd_pid;
  53
  54 static int command_pipe = -1;
  55 static int audiod_pipe = -1;
  56 static struct gui_args_info conf;
  57
  58 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  59
  60
  61 #define COLOR_STATUSBAR 52
  62 #define COLOR_COMMAND 53
  63 #define COLOR_OUTPUT 54
  64 #define COLOR_MSG 55
  65 #define COLOR_ERRMSG 56
  66 #define COLOR_WELCOME 57
  67 #define COLOR_SEPARATOR 58
  68 #define COLOR_TOP 59
  69 #define COLOR_BOT 60
  70
  71 struct gui_command {
  72         const char *key;
  73         const char *name;
  74         const char *description;
  75         void (*handler)(void);
  76 };
  77
  78 struct stat_item {
  79         char name[MAXLINE];
  80         char prefix[MAXLINE];
  81         char postfix[MAXLINE];
  82         unsigned y;
  83         unsigned x;
  84         unsigned len;
  85         int fg, bg;
  86         int align;
  87         char content[MAXLINE];
  88 };
  89
  90 static struct gui_theme theme;
  91
  92 int _argc;
  93 char **_argv;
  94
  95 static void com_help(void);
  96 static void com_reread_conf(void);
  97 static void com_enlarge_top_win(void);
  98 static void com_shrink_top_win(void);
  99 static void com_version(void);
 100 static void com_quit(void);
 101 static void com_refresh(void);
 102 static void com_ll_incr(void);
 103 static void com_ll_decr(void);
 104 static void com_prev_theme(void);
 105 static void com_next_theme(void);
 106 static void com_scroll_up(void);
 107 static void com_scroll_down(void);
 108 static void com_page_up(void);
 109 static void com_page_down(void);
 110
 111 struct gui_command command_list[] = {
 112         {
 113                 .key = "?",
 114                 .name = "help",
 115                 .description = "print help",
 116                 .handler = com_help
 117         }, {
 118                 .key = "+",
 119                 .name = "enlarge_win",
 120                 .description = "enlarge the top window",
 121                 .handler = com_enlarge_top_win
 122         }, {
 123                 .key = "-",
 124                 .name = "shrink_win",
 125                 .description = "shrink the top window",
 126                 .handler = com_shrink_top_win
 127         }, {
 128                 .key = "r",
 129                 .name = "reread_conf",
 130                 .description = "reread configuration file",
 131                 .handler = com_reread_conf
 132         }, {
 133                 .key = "q",
 134                 .name = "quit",
 135                 .description = "exit para_gui",
 136                 .handler = com_quit
 137         }, {
 138                 .key = "^L",
 139                 .name = "refresh",
 140                 .description = "redraw the screen",
 141                 .handler = com_refresh
 142         }, {
 143                 .key = ".",
 144                 .name = "next_theme",
 145                 .description = "switch to next theme",
 146                 .handler = com_next_theme
 147         }, {
 148                 .key = ",",
 149                 .name = "prev_theme",
 150                 .description = "switch to previous stream",
 151                 .handler = com_prev_theme
 152         }, {
 153                 .key = ">",
 154                 .name = "ll_incr",
 155                 .description = "increase loglevel (decreases verbosity)",
 156                 .handler = com_ll_incr
 157         }, {
 158                 .key = "<",
 159                 .name = "ll_decr",
 160                 .description = "decrease loglevel (increases verbosity)",
 161                 .handler = com_ll_decr
 162         }, {
 163                 .key = "V",
 164                 .name = "version",
 165                 .description = "show the para_gui version",
 166                 .handler = com_version
 167         }, {
 168                 .key = "<up>",
 169                 .name = "scroll_up",
 170                 .description = "scroll up one line",
 171                 .handler = com_scroll_up
 172         }, {
 173                 .key = "<down>",
 174                 .name = "scroll_down",
 175                 .description = "scroll down one line",
 176                 .handler = com_scroll_down
 177         }, {
 178                 .key = "<ppage>",
 179                 .name = "page_up",
 180                 .description = "scroll up one page",
 181                 .handler = com_page_up
 182         }, {
 183                 .key = "<npage>",
 184                 .name = "page_down",
 185                 .description = "scroll down one page",
 186                 .handler = com_page_down
 187         }, {
 188                 .handler = NULL
 189         }
 190 };
 191
 192 static int para_open_audiod_pipe(char *cmd)
 193 {
 194         int fds[3] = {0, 1, 0};
 195         pid_t pid;
 196         int ret = para_exec_cmdline_pid(&pid, cmd, fds);
 197         if (ret < 0)
 198                 return ret;
 199         ret = mark_fd_nonblocking(fds[1]);
 200         if (ret > 0)
 201                 return fds[1];
 202         close(fds[1]);
 203         return ret;
 204 }
 205
 206 static int read_audiod_pipe(int fd, line_handler_t *line_handler)
 207 {
 208         static char buf[4096];
 209         const ssize_t bufsize = sizeof(buf) - 1;
 210         static ssize_t loaded;
 211         ssize_t ret;
 212
 213         if (loaded >= bufsize)
 214                 loaded = 0;
 215         ret = read(fd, buf + loaded, bufsize - loaded);
 216         if (ret > 0) {
 217                 loaded += ret;
 218                 buf[loaded] = '\0';
 219                 loaded = for_each_line(buf, loaded, line_handler, NULL);
 220         }
 221         return ret;
 222 }
 223
 224 static int find_cmd_byname(char *name)
 225 {
 226         int i;
 227
 228         for (i = 0; command_list[i].handler; i++)
 229                 if (!strcmp(command_list[i].name, name))
 230                         return i;
 231         return -1;
 232 }
 233
 234 /* taken from mutt */
 235 static char *km_keyname(int c)
 236 {
 237         static char buf[10];
 238
 239         if (c == KEY_UP) {
 240                 sprintf(buf, "<up>");
 241                 return buf;
 242         }
 243         if (c == KEY_DOWN) {
 244                 sprintf(buf, "<down>");
 245                 return buf;
 246         }
 247         if (c == KEY_LEFT) {
 248                 sprintf(buf, "<left>");
 249                 return buf;
 250         }
 251         if (c == KEY_RIGHT) {
 252                 sprintf(buf, "<right>");
 253                 return buf;
 254         }
 255         if (c == KEY_NPAGE) {
 256                 sprintf(buf, "<npage>");
 257                 return buf;
 258         }
 259         if (c == KEY_PPAGE) {
 260                 sprintf(buf, "<ppage>");
 261                 return buf;
 262         }
 263         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 264                 if (c < 0)
 265                         c += 256;
 266                 if (c < 128) {
 267                         buf[0] = '^';
 268                         buf[1] = (c + '@') & 0x7f;
 269                         buf[2] = 0;
 270                 } else
 271                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 272                                 (c >> 3) & 7, c & 7);
 273         } else if (c >= KEY_F0 && c < KEY_F(256))
 274                 sprintf(buf, "<F%d>", c - KEY_F0);
 275         else if (isprint(c))
 276                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 277         else
 278                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 279         return buf;
 280 }
 281
 282 static char *configfile_exists(void)
 283 {
 284         static char *config_file;
 285         char *tmp;
 286
 287         if (!conf.config_file_given) {
 288                 if (!config_file) {
 289                         char *home = para_homedir();
 290                         config_file = make_message("%s/.paraslash/gui.conf",
 291                                 home);
 292                         free(home);
 293                 }
 294                 tmp = config_file;
 295         } else
 296                 tmp = conf.config_file_arg;
 297         return file_exists(tmp)? tmp: NULL;
 298 }
 299
 300 /*
 301  * print num spaces to curses window
 302  */
 303 static void add_spaces(WINDOW* win, unsigned int num)
 304 {
 305         while (num > 0) {
 306                 num--;
 307                 waddstr(win, " ");
 308         }
 309 }
 310
 311 /*
 312  * print aligned string to curses window. This function always prints
 313  * exactly len chars.
 314  */
 315 static int align_str(WINDOW* win, const char *string, unsigned int len,
 316                 unsigned int align)
 317 {
 318         int num; /* of spaces */
 319         char *str;
 320
 321         if (!win || !string)
 322                 return -1;
 323         num = len - strlen(string);
 324         str = para_strdup(string);
 325         if (num < 0) {
 326                 str[len] = '\0';
 327                 num = 0;
 328         }
 329         if (align == LEFT) {
 330                 waddstr(win, str);
 331                 add_spaces(win, num);
 332         } else if (align == RIGHT) {
 333                 add_spaces(win, num);
 334                 waddstr(win, str);
 335         } else {
 336                 add_spaces(win, num / 2);
 337                 waddstr(win, str[0]? str: "");
 338                 add_spaces(win, num - num / 2);
 339         }
 340         free(str);
 341         return 1;
 342 }
 343
 344 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 345 {
 346         char *msg;
 347
 348         if (!curses_active)
 349                 return;
 350         wattron(in.win, COLOR_PAIR(color));
 351         PARA_VSPRINTF(fmt, msg);
 352         wmove(in.win, 0, 0);
 353         align_str(in.win, msg, sb.cols, LEFT);
 354         free(msg);
 355         wrefresh(in.win);
 356 }
 357
 358 /*
 359  * update the status bar
 360  */
 361 static void print_status_bar(void)
 362 {
 363         if (!curses_active)
 364                 return;
 365         wmove(sb.win, 0, 0);
 366         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 367         wrefresh(sb.win);
 368 }
 369
 370 /*
 371  * get the number of the oldest rbe that is (partially) visible. On return,
 372  * lines contains the sum of the number of lines of all visable entries. If the
 373  * first one is only partially visible, lines is greater than bot.lines.
 374  */
 375 static int first_visible_rbe(unsigned *lines)
 376 {
 377         int i;
 378         *lines = 0;
 379         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 380                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 381                 int rbe_lines;
 382                 if (!rbe)
 383                         return i - 1;
 384 //              fprintf(stderr, "found: %s\n", rbe->msg);
 385                 rbe_lines = NUM_LINES(rbe->len);
 386                 if (rbe_lines > bot.lines)
 387                         return -1;
 388                 *lines += rbe_lines;
 389                 if (*lines >= bot.lines)
 390                         return i;
 391         }
 392         return RINGBUFFER_SIZE - 1;
 393 }
 394
 395 static int draw_top_rbe(unsigned *lines)
 396 {
 397         unsigned len;
 398         int offset, fvr = first_visible_rbe(lines);
 399         struct rb_entry *rbe;
 400
 401         if (fvr < 0)
 402                 return -1;
 403         wmove(bot.win, 0, 0);
 404         rbe = ringbuffer_get(bot_win_rb, fvr);
 405         if (!rbe)
 406                 return -1;
 407         /* first rbe might be only partially visible */
 408         offset = (*lines - bot.lines) * bot.cols;
 409         len = strlen(rbe->msg);
 410         if (offset < 0 || len < offset)
 411                 return -1;
 412         wattron(bot.win, COLOR_PAIR(rbe->color));
 413         waddstr(bot.win, rbe->msg + offset);
 414         *lines = NUM_LINES(len - offset);
 415         return fvr;
 416 }
 417
 418 static void redraw_bot_win(void)
 419 {
 420         unsigned lines;
 421         int i;
 422
 423         wmove(bot.win, 0, 0);
 424         wclear(bot.win);
 425         i = draw_top_rbe(&lines);
 426         if (i <= 0)
 427                 goto out;
 428         while (i > 0 && lines < bot.lines) {
 429                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 430                 if (!rbe) {
 431                         lines++;
 432                         waddstr(bot.win, "\n");
 433                         continue;
 434                 }
 435                 lines += NUM_LINES(rbe->len);
 436                 wattron(bot.win, COLOR_PAIR(rbe->color));
 437                 waddstr(bot.win, "\n");
 438                 waddstr(bot.win, rbe->msg);
 439         }
 440 out:
 441         wrefresh(bot.win);
 442 }
 443
 444 static void rb_add_entry(int color, char *msg)
 445 {
 446         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 447         int x, y;
 448         new->color = color;
 449         new->len = strlen(msg);
 450         new->msg = msg;
 451         old = ringbuffer_add(bot_win_rb, new);
 452 //      fprintf(stderr, "added: %s\n", new->msg);
 453         if (old) {
 454                 free(old->msg);
 455                 free(old);
 456         }
 457         if (scroll_position) {
 458                 /* discard current scrolling, like xterm does */
 459                 scroll_position = 0;
 460                 redraw_bot_win();
 461                 return;
 462         }
 463         wattron(bot.win, COLOR_PAIR(color));
 464         getyx(bot.win, y, x);
 465         if (y || x)
 466                 waddstr(bot.win, "\n");
 467         waddstr(bot.win, msg);
 468 }
 469
 470 /*
 471  * print formated output to bot win and refresh
 472  */
 473 __printf_2_3 static void outputf(int color, const char* fmt,...)
 474 {
 475         char *msg;
 476
 477         if (!curses_active)
 478                 return;
 479         PARA_VSPRINTF(fmt, msg);
 480         rb_add_entry(color, msg);
 481         wrefresh(bot.win);
 482 }
 483
 484 static int add_output_line(char *line, __a_unused void *data)
 485 {
 486         if (!curses_active)
 487                 return 1;
 488         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 489         return 1;
 490 }
 491
 492 static int loglevel;
 493
 494 __printf_2_3 void para_log(int ll, const char *fmt,...)
 495 {
 496         int color;
 497         char *msg;
 498
 499         if (ll < loglevel || !curses_active)
 500                 return;
 501         switch (ll) {
 502                 case LL_DEBUG:
 503                 case LL_INFO:
 504                 case LL_NOTICE:
 505                         color = COLOR_MSG;
 506                         break;
 507                 default:
 508                         color = COLOR_ERRMSG;
 509         }
 510         PARA_VSPRINTF(fmt, msg);
 511         chop(msg);
 512         rb_add_entry(color, msg);
 513         wrefresh(bot.win);
 514 }
 515
 516 static void setup_signal_handling(void)
 517 {
 518         signal_pipe = para_signal_init();
 519         para_install_sighandler(SIGINT);
 520         para_install_sighandler(SIGTERM);
 521         para_install_sighandler(SIGCHLD);
 522         para_install_sighandler(SIGWINCH);
 523         para_install_sighandler(SIGUSR1);
 524         para_sigaction(SIGHUP, SIG_IGN);
 525 }
 526
 527 __noreturn static void do_exit(int ret)
 528 {
 529         para_sigaction(SIGTERM, SIG_IGN);
 530         kill(0, SIGTERM);
 531         exit(ret);
 532 }
 533
 534 static void shutdown_curses(void)
 535 {
 536         if (!curses_active)
 537                 return;
 538         def_prog_mode();
 539         curses_active = 0;
 540         endwin();
 541 }
 542
 543 __noreturn static void finish(int ret)
 544 {
 545         shutdown_curses();
 546         do_exit(ret);
 547 }
 548
 549 /*
 550  * exit curses and print given message to stdout/stderr
 551  */
 552 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 553 {
 554         va_list argp;
 555         FILE *outfd = ret? stderr: stdout;
 556
 557         shutdown_curses();
 558         va_start(argp, fmt);
 559         vfprintf(outfd, fmt, argp);
 560         va_end(argp);
 561         do_exit(ret);
 562 }
 563
 564 static void print_welcome(void)
 565 {
 566         if (loglevel > LL_NOTICE)
 567                 return;
 568         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 569                 " \"" CODENAME "\". Theme: %s", theme.name);
 570         wclrtoeol(bot.win);
 571 }
 572
 573 /*
 574  * init all windows
 575  */
 576 static void init_wins(int top_lines)
 577 {
 578         int i;
 579
 580         top.lines = top_lines;
 581         top.cols = COLS;
 582         top.begy = 0;
 583         top.begx = 0;
 584
 585         bot.lines = LINES - top.lines - 3;
 586         bot.cols = COLS;
 587         bot.begy = top.lines + 1;
 588         bot.begx = 0;
 589
 590         sb.lines = 1;
 591         sb.cols = COLS;
 592         sb.begy = LINES - 2;
 593         sb.begx = 0;
 594
 595         in.lines = 1;
 596         in.cols = COLS;
 597         in.begy = LINES - 1;
 598         in.begx = 0;
 599
 600         sep.lines = 1;
 601         sep.cols = COLS;
 602         sep.begy = top.lines;
 603         sep.begx = 0;
 604
 605         assume_default_colors(theme.default_fg, theme.default_bg);
 606         if (top.win) {
 607                 mvwin(top.win, top.begy, top.begx);
 608                 wresize(top.win, top.lines, top.cols);
 609
 610                 mvwin(sb.win, sb.begy, sb.begx);
 611                 wresize(sb.win, sb.lines, sb.cols);
 612
 613                 mvwin(sep.win, sep.begy, sep.begx);
 614                 wresize(sep.win, sep.lines, sep.cols);
 615
 616                 mvwin(bot.win, bot.begy, bot.begx);
 617                 wresize(bot.win, bot.lines, bot.cols);
 618
 619                 mvwin(in.win, in.begy, in.begx);
 620                 wresize(in.win, in.lines, in.cols);
 621         } else {
 622                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 623                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 624                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 625                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 626                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 627                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 628                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 629                 wclear(bot.win);
 630                 wclear(sb.win);
 631                 wclear(in.win);
 632                 scrollok(bot.win, 1);
 633                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 634                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 635                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 636                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 637                 nodelay(top.win, 1);
 638                 nodelay(bot.win, 1);
 639                 nodelay(sb.win, 1);
 640                 nodelay(in.win, 0);
 641
 642                 keypad(top.win, 1);
 643                 keypad(bot.win, 1);
 644                 keypad(sb.win, 1);
 645                 keypad(in.win, 1);
 646                 print_status_bar();
 647         }
 648         wmove(sep.win, 0, 0);
 649         for (i = 1; i <= COLS; i++)
 650                 waddstr(sep.win, theme.sep_str);
 651         wclear(top.win);
 652         //wclear(bot.win);
 653         wnoutrefresh(top.win);
 654         wnoutrefresh(bot.win);
 655         //wnoutrefresh(sb.win);
 656         print_status_bar();
 657         wnoutrefresh(in.win);
 658         wnoutrefresh(sep.win);
 659         doupdate();
 660 }
 661
 662 static void check_geometry(void)
 663 {
 664         if (LINES < theme.lines_min || COLS < theme.cols_min)
 665                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 666                         " (need at least %dx%d)\n", COLS, LINES,
 667                         theme.cols_min, theme.lines_min);
 668 }
 669
 670 /*
 671  * Print stat item #i to curses window
 672  */
 673 static void print_stat_item(int i)
 674 {
 675         char *tmp;
 676         struct stat_item_data d = theme.data[i];
 677         char *c = stat_content[i];
 678
 679         if (!curses_active || !d.len || !c)
 680                 return;
 681         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 682         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 683         wrefresh(top.win);
 684         wattron(top.win, COLOR_PAIR(i + 1));
 685         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 686         free(tmp);
 687         wrefresh(top.win);
 688 }
 689
 690 static void print_all_items(void)
 691 {
 692         int i;
 693
 694         if (!curses_active)
 695                 return;
 696         FOR_EACH_STATUS_ITEM(i)
 697                 print_stat_item(i);
 698 }
 699
 700 static void clear_all_items(void)
 701 {
 702         int i;
 703
 704         FOR_EACH_STATUS_ITEM(i) {
 705                 free(stat_content[i]);
 706                 stat_content[i] = para_strdup("");
 707         }
 708 }
 709
 710 static void init_colors(void)
 711 {
 712         int i;
 713
 714         if (!has_colors())
 715                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 716         start_color();
 717         FOR_EACH_STATUS_ITEM(i)
 718                 if (theme.data[i].len)
 719                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 720         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 721         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 722         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 723         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 724         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 725         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 726         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 727         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 728         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 729 }
 730
 731 /*
 732  * (re-)initialize the curses library  FIXME: Error checking
 733  */
 734 static void init_curses(void)
 735 {
 736         curses_active = 1;
 737         if (top.win && refresh() == ERR) { /* refesh is really needed */
 738                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 739         }
 740         check_geometry();
 741         curs_set(0); /* make cursor invisible, ignore errors */
 742 //      if (noraw() == ERR);
 743 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 744 //                      "raw mode\n");
 745         nonl(); /* tell curses not to do NL->CR/NL on output */
 746         noecho(); /* don't echo input */
 747         cbreak(); /* take input chars one at a time, no wait for \n */
 748         //reset_prog_mode();
 749         init_colors();
 750         clear();
 751         init_wins(theme.top_lines_default);
 752         print_all_items();
 753         noecho(); /* don't echo input */
 754 }
 755
 756
 757 static void check_sigchld(void)
 758 {
 759         int ret;
 760         pid_t pid;
 761 reap_next_child:
 762         ret = para_reap_child(&pid);
 763         if (ret <= 0)
 764                 return;
 765         if (pid == cmd_pid) {
 766                 cmd_pid = 0;
 767                 cmd_died = 1;
 768         }
 769         goto reap_next_child;
 770 }
 771
 772 /*
 773  * print status line if line starts with known command.
 774  */
 775 static int check_stat_line(char *line, __a_unused void *data)
 776 {
 777         int i;
 778
 779 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 780         i = stat_line_valid(line);
 781         if (i >= 0) {
 782                 line += strlen(status_item_list[i]) + 1;
 783                 if (*line == ' ')
 784                         line++;
 785                 free(stat_content[i]);
 786                 stat_content[i] = para_strdup(line);
 787                 print_stat_item(i);
 788         }
 789         return 1;
 790 }
 791
 792 /*
 793  * This sucker modifies its first argument. *handler and *arg are
 794  * pointers to 0-terminated strings (inside line). Crap.
 795  */
 796 static int split_key_map(char *line, char **handler, char **arg)
 797 {
 798         if (!(*handler = strchr(line + 1, ':')))
 799                 goto err_out;
 800         **handler = '\0';
 801         (*handler)++;
 802         if (!(*arg = strchr(*handler, ':')))
 803                 goto err_out;
 804         **arg = '\0';
 805         (*arg)++;
 806         return 1;
 807 err_out:
 808         return 0;
 809 }
 810
 811 static int check_key_map_args(void)
 812 {
 813         char *s;
 814         int i, ret = -1;
 815         char *tmp = NULL, *handler, *arg;
 816
 817         for (i = 0; i < conf.key_map_given; ++i) {
 818                 s = conf.key_map_arg[i];
 819                 if (!(*s))
 820                         goto err_out;
 821                 free(tmp);
 822                 tmp = para_strdup(s);
 823                 if (!split_key_map(tmp, &handler, &arg))
 824                         goto err_out;
 825                 if (strlen(handler) != 1)
 826                         goto err_out;
 827                 if (*handler != 'x'
 828                         && *handler != 'd'
 829                         && *handler != 'i'
 830                         && *handler != 'p')
 831                         goto err_out;
 832                 if (*handler != 'i')
 833                         continue;
 834                 if (find_cmd_byname(arg) < 0)
 835                         goto err_out;
 836         }
 837         ret = 0;
 838 err_out:
 839         free(tmp);
 840         return ret;
 841 }
 842
 843 /*
 844  * React to various signal-related events
 845  */
 846 static void handle_signal(int sig)
 847 {
 848         switch (sig) {
 849         case SIGTERM:
 850                 msg_n_exit(EXIT_FAILURE,
 851                         "only the good die young (caught SIGTERM))\n");
 852                 return;
 853         case SIGWINCH:
 854                 if (curses_active) {
 855                         shutdown_curses();
 856                         init_curses();
 857                         redraw_bot_win();
 858                 }
 859                 return;
 860         case SIGINT:
 861                 PARA_WARNING_LOG("caught SIGINT, reset");
 862                 /* Nothing to do. SIGINT killed our child, para_client stat.
 863                  * This get noticed by do_select which resets everything
 864                  */
 865                 return;
 866         case SIGUSR1:
 867                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 868                 com_reread_conf();
 869                 return;
 870         case SIGCHLD:
 871                 check_sigchld();
 872                 return;
 873         }
 874 }
 875
 876 static int open_audiod_pipe(void)
 877 {
 878         static int init = 1;
 879
 880         if (init)
 881                 init = 0;
 882         else
 883                 sleep(1);
 884         return para_open_audiod_pipe(conf.stat_cmd_arg);
 885 }
 886
 887 /*
 888  * This is the core select loop. Besides the (internal) signal
 889  * pipe, the following other fds are checked according to the mode:
 890  *
 891  * GETCH_MODE: check stdin, return when key is pressed
 892  *
 893  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 894  * of output has been read or when other end has closed command pipe or
 895  * when any key is pressed.
 896  *
 897  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 898  * is running. During that time curses is disabled.  Returns when
 899  * cmd_pid == 0.
 900  */
 901 static int do_select(int mode)
 902 {
 903         fd_set rfds;
 904         int ret;
 905         int max_fileno, cp_numread = 1;
 906         char command_buf[4096] = "";
 907         int cbo = 0; /* command buf offset */
 908         struct timeval tv;
 909 repeat:
 910         tv.tv_sec = conf.timeout_arg  / 1000;
 911         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 912 //      ret = refresh_status();
 913         FD_ZERO(&rfds);
 914         max_fileno = 0;
 915         /* audiod pipe */
 916         if (audiod_pipe < 0)
 917                 audiod_pipe = open_audiod_pipe();
 918         if (audiod_pipe >= 0)
 919                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 920         /* signal pipe */
 921         para_fd_set(signal_pipe, &rfds, &max_fileno);
 922         /* command pipe only for COMMAND_MODE */
 923         if (command_pipe >= 0 && mode == COMMAND_MODE)
 924                 para_fd_set(command_pipe, &rfds, &max_fileno);
 925         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 926         if (ret <= 0)
 927                 goto check_return; /* skip fd checks */
 928         /* signals */
 929         if (FD_ISSET(signal_pipe, &rfds)) {
 930                 int sig_nr = para_next_signal();
 931                 if (sig_nr > 0)
 932                         handle_signal(sig_nr);
 933         }
 934         /* read command pipe if ready */
 935         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 936                         FD_ISSET(command_pipe, &rfds)) {
 937                 cp_numread = read(command_pipe, command_buf + cbo,
 938                         sizeof(command_buf) - 1 - cbo);
 939                 if (cp_numread >= 0)
 940                         cbo += cp_numread;
 941                 else {
 942                         if (cp_numread < 0)
 943                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 944                         close(command_pipe);
 945                         command_pipe = -1;
 946                 }
 947         }
 948         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 949                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 950                         close(audiod_pipe);
 951                         audiod_pipe = -1;
 952                         clear_all_items();
 953                         free(stat_content[SI_BASENAME]);
 954                         stat_content[SI_BASENAME] =
 955                                 para_strdup("audiod not running!?");
 956                         print_all_items();
 957                 }
 958 check_return:
 959         switch (mode) {
 960         case COMMAND_MODE:
 961                 if (cp_numread <= 0 && !cbo) /* command complete */
 962                         return 0;
 963                 if (cbo)
 964                         cbo = for_each_line(command_buf, cbo,
 965                                 &add_output_line, NULL);
 966                 if (cp_numread <= 0)
 967                         cbo = 0;
 968                 wrefresh(bot.win);
 969                 ret = wgetch(top.win);
 970                 if (ret != ERR && ret != KEY_RESIZE) {
 971                         if (command_pipe) {
 972                                 close(command_pipe);
 973                                 command_pipe = -1;
 974                         }
 975                         if (cmd_pid)
 976                                 kill(cmd_pid, SIGTERM);
 977                         return -1;
 978                 }
 979                 break;
 980         case GETCH_MODE:
 981                 ret = wgetch(top.win);
 982                 if (ret != ERR && ret != KEY_RESIZE)
 983                         return ret;
 984                 break;
 985         case EXTERNAL_MODE:
 986                 if (cmd_died) {
 987                         cmd_died = 0;
 988                         return 0;
 989                 }
 990         }
 991         goto repeat;
 992 }
 993
 994 /*
 995  * read from command pipe and print data to bot window
 996  */
 997 static int send_output(void)
 998 {
 999         int ret;
1000
1001         if (command_pipe < 0)
1002                 return 0;
1003         ret = mark_fd_nonblocking(command_pipe);
1004         if (ret < 0) {
1005                 close(command_pipe);
1006                 return ret;
1007         }
1008         if (do_select(COMMAND_MODE) >= 0)
1009                 PARA_INFO_LOG("command complete");
1010         else
1011                 PARA_NOTICE_LOG("command aborted");
1012         print_in_bar(COLOR_MSG, " ");
1013         return 1;
1014 }
1015
1016 static int client_cmd_cmdline(char *cmd)
1017 {
1018         int ret, fds[3] = {0, 1, 0};
1019         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1020
1021         outputf(COLOR_COMMAND, "%s", c);
1022         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1023         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1024         free(c);
1025         if (ret < 0)
1026                 return -1;
1027         command_pipe = fds[1];
1028         return send_output();
1029 }
1030
1031 /*
1032  * exec command and print output to bot win
1033  */
1034 static int display_cmd(char *cmd)
1035 {
1036         int fds[3] = {0, 1, 0};
1037
1038         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1039         outputf(COLOR_COMMAND, "%s", cmd);
1040         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1041                 return -1;
1042         command_pipe = fds[1];
1043         return send_output();
1044 }
1045
1046 /*
1047  * shutdown curses and stat pipe before executing external commands
1048  */
1049 static int external_cmd(char *cmd)
1050 {
1051         int fds[3] = {-1, -1, -1};
1052
1053         if (cmd_pid)
1054                 return -1;
1055         shutdown_curses();
1056         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1057         cmd_died = 0;
1058         do_select(EXTERNAL_MODE);
1059         init_curses();
1060         return 0;
1061 }
1062
1063 static void print_scroll_msg(void)
1064 {
1065         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1066         int first_rbe = first_visible_rbe(&lines_total);
1067         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1068                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1069 }
1070
1071 static void com_page_down(void)
1072 {
1073         unsigned lines = 0;
1074         int i = scroll_position;
1075         while (lines < bot.lines && --i > 0) {
1076                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1077                 if (!rbe)
1078                         break;
1079                 lines += NUM_LINES(strlen(rbe->msg));
1080         }
1081         if (lines) {
1082                 scroll_position = i;
1083                 redraw_bot_win();
1084                 print_scroll_msg();
1085                 return;
1086         }
1087         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1088 }
1089
1090 static void com_page_up(void)
1091 {
1092         unsigned lines;
1093         int fvr = first_visible_rbe(&lines);
1094
1095         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1096                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1097                 return;
1098         }
1099         scroll_position = fvr + 1;
1100         for (; scroll_position > 0; scroll_position--) {
1101                 first_visible_rbe(&lines);
1102                 if (lines == bot.lines)
1103                         break;
1104         }
1105         redraw_bot_win();
1106         print_scroll_msg();
1107 }
1108
1109 static void com_scroll_down(void)
1110 {
1111         struct rb_entry *rbe;
1112         int rbe_lines;
1113
1114         if (!scroll_position) {
1115                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1116                 return;
1117         }
1118         scroll_position--;
1119         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1120         rbe_lines = NUM_LINES(rbe->len);
1121         wscrl(bot.win, rbe_lines);
1122         wmove(bot.win, bot.lines - rbe_lines, 0);
1123         wattron(bot.win, COLOR_PAIR(rbe->color));
1124         waddstr(bot.win, rbe->msg);
1125         wrefresh(bot.win);
1126         print_scroll_msg();
1127 }
1128
1129 static void com_scroll_up(void)
1130 {
1131         struct rb_entry *rbe = NULL;
1132         unsigned lines;
1133         int i, first_rbe, num_scroll;
1134
1135         /* the entry that is going to vanish */
1136         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1137         if (!rbe)
1138                 goto err_out;
1139         num_scroll = NUM_LINES(rbe->len);
1140         first_rbe = first_visible_rbe(&lines);
1141         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1142                 goto err_out;
1143         scroll_position++;
1144         wscrl(bot.win, -num_scroll);
1145         i = draw_top_rbe(&lines);
1146         if (i < 0)
1147                 goto err_out;
1148         while (i > 0 && lines < num_scroll) {
1149                 int rbe_lines;
1150                 rbe = ringbuffer_get(bot_win_rb, --i);
1151                 if (!rbe)
1152                         break;
1153                 rbe_lines = NUM_LINES(rbe->len);
1154                 lines += rbe_lines;
1155 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1156                 wattron(bot.win, COLOR_PAIR(rbe->color));
1157                 waddstr(bot.win, "\n");
1158                 waddstr(bot.win, rbe->msg);
1159                 if (!i)
1160                         break;
1161                 i--;
1162         }
1163         wrefresh(bot.win);
1164         print_scroll_msg();
1165         return;
1166 err_out:
1167         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1168 }
1169
1170 static void com_ll_decr(void)
1171 {
1172         if (loglevel <= LL_DEBUG) {
1173                 print_in_bar(COLOR_ERRMSG,
1174                         "loglevel already at maximal verbosity\n");
1175                 return;
1176         }
1177         loglevel--;
1178         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1179 }
1180
1181 static void com_ll_incr(void)
1182 {
1183         if (loglevel >= LL_EMERG) {
1184                 print_in_bar(COLOR_ERRMSG,
1185                         "loglevel already at minimal verbosity\n");
1186                 return;
1187         }
1188         loglevel++;
1189         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1190 }
1191
1192 /*
1193  * reread configuration, terminate on errors
1194  */
1195 static void com_reread_conf(void)
1196 {
1197         char *cf =configfile_exists();
1198         struct gui_cmdline_parser_params params = {
1199                 .override = 1,
1200                 .initialize = 1,
1201                 .check_required = 0,
1202                 .check_ambiguity = 0
1203         };
1204
1205         if (!cf) {
1206                 PARA_WARNING_LOG("there is no configuration to read");
1207                 return;
1208         }
1209         PARA_INFO_LOG("rereading command line options and config file");
1210         gui_cmdline_parser(_argc, _argv, &conf);
1211         gui_cmdline_parser_config_file(cf, &conf, &params);
1212         PARA_NOTICE_LOG("config file reloaded");
1213         if (check_key_map_args() < 0)
1214                 finish(EXIT_FAILURE);
1215 }
1216
1217 static void com_help(void)
1218 {
1219         int i;
1220
1221         for (i = 0; i < conf.key_map_given; ++i) {
1222                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1223                 const char *handler_text = "???", *desc = NULL;
1224
1225                 if (!split_key_map(tmp, &handler, &arg)) {
1226                         free(tmp);
1227                         return;
1228                 }
1229                 switch (*handler) {
1230                         case 'i':
1231                                 handler_text = "internal";
1232                                 desc = command_list[find_cmd_byname(arg)].description;
1233                                 break;
1234                         case 'x': handler_text = "external"; break;
1235                         case 'd': handler_text = "display "; break;
1236                         case 'p': handler_text = "para    "; break;
1237                 }
1238                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1239                         strlen(arg) < 8? "\t" : "",
1240                         desc? desc : "");
1241                 free(tmp);
1242         }
1243         for (i = 0; command_list[i].handler; i++) {
1244                 struct gui_command gc = command_list[i];
1245
1246                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1247                         strlen(gc.name) < 8? "\t" : "",
1248                         gc.description);
1249         }
1250         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1251                 "for more info");
1252 }
1253
1254 static void com_shrink_top_win(void)
1255 {
1256         if (top.lines <= theme.top_lines_min) {
1257                 PARA_WARNING_LOG("can not decrease top window");
1258                 return;
1259         }
1260         init_wins(top.lines - 1);
1261         wclear(top.win);
1262         print_all_items();
1263         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1264 }
1265
1266 static void com_enlarge_top_win(void)
1267 {
1268         if (bot.lines < 3) {
1269                 PARA_WARNING_LOG("can not increase top window");
1270                 return;
1271         }
1272         init_wins(top.lines + 1);
1273         wclear(top.win);
1274         print_all_items();
1275         print_in_bar(COLOR_MSG, "increased top window");
1276 }
1277
1278 static void com_version(void)
1279 {
1280         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1281                 CODENAME "\"");
1282 }
1283
1284 __noreturn static void com_quit(void)
1285 {
1286         finish(0);
1287 }
1288
1289 static void com_refresh(void)
1290 {
1291         shutdown_curses();
1292         init_curses();
1293 }
1294
1295 static void change_theme(int next)
1296 {
1297         if (next)
1298                 next_theme(&theme);
1299         else
1300                 prev_theme(&theme);
1301         /* This seems to be needed twice, why? */
1302         com_refresh();
1303         com_refresh();
1304         PARA_NOTICE_LOG("new theme: %s", theme.name);
1305 }
1306
1307 static void com_next_theme(void)
1308 {
1309         change_theme(1);
1310 }
1311
1312 static void com_prev_theme(void)
1313 {
1314         change_theme(0);
1315 }
1316
1317
1318 static void handle_command(int c)
1319 {
1320         int i;
1321
1322         /* first check user's key bindings */
1323         for (i = 0; i < conf.key_map_given; ++i) {
1324                 char tmp[MAXLINE], *handler, *arg;
1325
1326                 strcpy(tmp, conf.key_map_arg[i]);
1327                 if (!split_key_map(tmp, &handler, &arg))
1328                         return;
1329                 if (!strcmp(tmp, km_keyname(c))) {
1330                         if (*handler == 'd') {
1331                                 display_cmd(arg);
1332                                 return;
1333                         }
1334                         if (*handler == 'x') {
1335                                 external_cmd(arg);
1336                                 return;
1337                         }
1338                         if (*handler == 'p') {
1339                                 client_cmd_cmdline(arg);
1340                                 return;
1341                         }
1342                         if (*handler == 'i') {
1343                                 int num = find_cmd_byname(arg);
1344                                 if (num >= 0)
1345                                         command_list[num].handler();
1346                                 return;
1347                         }
1348                 }
1349         }
1350         /* not found, check internal key bindings */
1351         for (i = 0; command_list[i].handler; i++) {
1352                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1353                         command_list[i].handler();
1354                         return;
1355                 }
1356         }
1357         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1358                 km_keyname(c));
1359 }
1360
1361 int main(int argc, char *argv[])
1362 {
1363         int ret;
1364         char *cf;
1365
1366         _argc = argc;
1367         _argv = argv;
1368
1369         if (gui_cmdline_parser(argc, argv, &conf)) {
1370                 fprintf(stderr, "parse error while reading command line\n");
1371                 exit(EXIT_FAILURE);
1372         }
1373         HANDLE_VERSION_FLAG("gui", conf);
1374         init_theme(0, &theme);
1375         top.lines = theme.top_lines_default;
1376         if (check_key_map_args() < 0) {
1377                 fprintf(stderr, "invalid key map\n");
1378                 exit(EXIT_FAILURE);
1379         }
1380         cf = configfile_exists();
1381         if (!cf && conf.config_file_given) {
1382                 fprintf(stderr, "can not read config file %s\n",
1383                         conf.config_file_arg);
1384                 exit(EXIT_FAILURE);
1385         }
1386         if (cf) {
1387                 struct gui_cmdline_parser_params params = {
1388                         .override = 0,
1389                         .initialize = 0,
1390                         .check_required = 0,
1391                         .check_ambiguity = 0
1392                 };
1393                 gui_cmdline_parser_config_file(cf, &conf, &params);
1394         }
1395         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1396         if (check_key_map_args() < 0) {
1397                 fprintf(stderr, "invalid key map in config file\n");
1398                 exit(EXIT_FAILURE);
1399         }
1400         setup_signal_handling();
1401         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1402         initscr(); /* needed only once, always successful */
1403         init_curses();
1404         print_welcome();
1405         for (;;) {
1406                 print_status_bar();
1407                 ret = do_select(GETCH_MODE);
1408                 if (!ret)
1409                         continue;
1410                 print_in_bar(COLOR_MSG, " ");
1411                 handle_command(ret);
1412         }
1413 }