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 find_cmd_byname(char *name)
 207 {
 208         int i;
 209
 210         for (i = 0; command_list[i].handler; i++)
 211                 if (!strcmp(command_list[i].name, name))
 212                         return i;
 213         return -1;
 214 }
 215
 216 /* taken from mutt */
 217 static char *km_keyname(int c)
 218 {
 219         static char buf[10];
 220
 221         if (c == KEY_UP) {
 222                 sprintf(buf, "<up>");
 223                 return buf;
 224         }
 225         if (c == KEY_DOWN) {
 226                 sprintf(buf, "<down>");
 227                 return buf;
 228         }
 229         if (c == KEY_LEFT) {
 230                 sprintf(buf, "<left>");
 231                 return buf;
 232         }
 233         if (c == KEY_RIGHT) {
 234                 sprintf(buf, "<right>");
 235                 return buf;
 236         }
 237         if (c == KEY_NPAGE) {
 238                 sprintf(buf, "<npage>");
 239                 return buf;
 240         }
 241         if (c == KEY_PPAGE) {
 242                 sprintf(buf, "<ppage>");
 243                 return buf;
 244         }
 245         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 246                 if (c < 0)
 247                         c += 256;
 248                 if (c < 128) {
 249                         buf[0] = '^';
 250                         buf[1] = (c + '@') & 0x7f;
 251                         buf[2] = 0;
 252                 } else
 253                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 254                                 (c >> 3) & 7, c & 7);
 255         } else if (c >= KEY_F0 && c < KEY_F(256))
 256                 sprintf(buf, "<F%d>", c - KEY_F0);
 257         else if (isprint(c))
 258                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 259         else
 260                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 261         return buf;
 262 }
 263
 264 static char *configfile_exists(void)
 265 {
 266         static char *config_file;
 267         char *tmp;
 268
 269         if (!conf.config_file_given) {
 270                 if (!config_file) {
 271                         char *home = para_homedir();
 272                         config_file = make_message("%s/.paraslash/gui.conf",
 273                                 home);
 274                         free(home);
 275                 }
 276                 tmp = config_file;
 277         } else
 278                 tmp = conf.config_file_arg;
 279         return file_exists(tmp)? tmp: NULL;
 280 }
 281
 282 /*
 283  * print num spaces to curses window
 284  */
 285 static void add_spaces(WINDOW* win, unsigned int num)
 286 {
 287         while (num > 0) {
 288                 num--;
 289                 waddstr(win, " ");
 290         }
 291 }
 292
 293 /*
 294  * print aligned string to curses window. This function always prints
 295  * exactly len chars.
 296  */
 297 static int align_str(WINDOW* win, const char *string, unsigned int len,
 298                 unsigned int align)
 299 {
 300         int num; /* of spaces */
 301         char *str;
 302
 303         if (!win || !string)
 304                 return -1;
 305         num = len - strlen(string);
 306         str = para_strdup(string);
 307         if (num < 0) {
 308                 str[len] = '\0';
 309                 num = 0;
 310         }
 311         if (align == LEFT) {
 312                 waddstr(win, str);
 313                 add_spaces(win, num);
 314         } else if (align == RIGHT) {
 315                 add_spaces(win, num);
 316                 waddstr(win, str);
 317         } else {
 318                 add_spaces(win, num / 2);
 319                 waddstr(win, str[0]? str: "");
 320                 add_spaces(win, num - num / 2);
 321         }
 322         free(str);
 323         return 1;
 324 }
 325
 326 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 327 {
 328         char *msg;
 329
 330         if (!curses_active)
 331                 return;
 332         wattron(in.win, COLOR_PAIR(color));
 333         PARA_VSPRINTF(fmt, msg);
 334         wmove(in.win, 0, 0);
 335         align_str(in.win, msg, sb.cols, LEFT);
 336         free(msg);
 337         wrefresh(in.win);
 338 }
 339
 340 /*
 341  * update the status bar
 342  */
 343 static void print_status_bar(void)
 344 {
 345         if (!curses_active)
 346                 return;
 347         wmove(sb.win, 0, 0);
 348         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 349         wrefresh(sb.win);
 350 }
 351
 352 /*
 353  * get the number of the oldest rbe that is (partially) visible. On return,
 354  * lines contains the sum of the number of lines of all visable entries. If the
 355  * first one is only partially visible, lines is greater than bot.lines.
 356  */
 357 static int first_visible_rbe(unsigned *lines)
 358 {
 359         int i;
 360         *lines = 0;
 361         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 362                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 363                 int rbe_lines;
 364                 if (!rbe)
 365                         return i - 1;
 366 //              fprintf(stderr, "found: %s\n", rbe->msg);
 367                 rbe_lines = NUM_LINES(rbe->len);
 368                 if (rbe_lines > bot.lines)
 369                         return -1;
 370                 *lines += rbe_lines;
 371                 if (*lines >= bot.lines)
 372                         return i;
 373         }
 374         return RINGBUFFER_SIZE - 1;
 375 }
 376
 377 static int draw_top_rbe(unsigned *lines)
 378 {
 379         unsigned len;
 380         int offset, fvr = first_visible_rbe(lines);
 381         struct rb_entry *rbe;
 382
 383         if (fvr < 0)
 384                 return -1;
 385         wmove(bot.win, 0, 0);
 386         rbe = ringbuffer_get(bot_win_rb, fvr);
 387         if (!rbe)
 388                 return -1;
 389         /* first rbe might be only partially visible */
 390         offset = (*lines - bot.lines) * bot.cols;
 391         len = strlen(rbe->msg);
 392         if (offset < 0 || len < offset)
 393                 return -1;
 394         wattron(bot.win, COLOR_PAIR(rbe->color));
 395         waddstr(bot.win, rbe->msg + offset);
 396         *lines = NUM_LINES(len - offset);
 397         return fvr;
 398 }
 399
 400 static void redraw_bot_win(void)
 401 {
 402         unsigned lines;
 403         int i;
 404
 405         wmove(bot.win, 0, 0);
 406         wclear(bot.win);
 407         i = draw_top_rbe(&lines);
 408         if (i <= 0)
 409                 goto out;
 410         while (i > 0 && lines < bot.lines) {
 411                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 412                 if (!rbe) {
 413                         lines++;
 414                         waddstr(bot.win, "\n");
 415                         continue;
 416                 }
 417                 lines += NUM_LINES(rbe->len);
 418                 wattron(bot.win, COLOR_PAIR(rbe->color));
 419                 waddstr(bot.win, "\n");
 420                 waddstr(bot.win, rbe->msg);
 421         }
 422 out:
 423         wrefresh(bot.win);
 424 }
 425
 426 static void rb_add_entry(int color, char *msg)
 427 {
 428         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 429         int x, y;
 430         new->color = color;
 431         new->len = strlen(msg);
 432         new->msg = msg;
 433         old = ringbuffer_add(bot_win_rb, new);
 434 //      fprintf(stderr, "added: %s\n", new->msg);
 435         if (old) {
 436                 free(old->msg);
 437                 free(old);
 438         }
 439         if (scroll_position) {
 440                 /* discard current scrolling, like xterm does */
 441                 scroll_position = 0;
 442                 redraw_bot_win();
 443                 return;
 444         }
 445         wattron(bot.win, COLOR_PAIR(color));
 446         getyx(bot.win, y, x);
 447         if (y || x)
 448                 waddstr(bot.win, "\n");
 449         waddstr(bot.win, msg);
 450 }
 451
 452 /*
 453  * print formated output to bot win and refresh
 454  */
 455 __printf_2_3 static void outputf(int color, const char* fmt,...)
 456 {
 457         char *msg;
 458
 459         if (!curses_active)
 460                 return;
 461         PARA_VSPRINTF(fmt, msg);
 462         rb_add_entry(color, msg);
 463         wrefresh(bot.win);
 464 }
 465
 466 static int add_output_line(char *line, __a_unused void *data)
 467 {
 468         if (!curses_active)
 469                 return 1;
 470         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 471         return 1;
 472 }
 473
 474 static int loglevel;
 475
 476 __printf_2_3 void para_log(int ll, const char *fmt,...)
 477 {
 478         int color;
 479         char *msg;
 480
 481         if (ll < loglevel || !curses_active)
 482                 return;
 483         switch (ll) {
 484                 case LL_DEBUG:
 485                 case LL_INFO:
 486                 case LL_NOTICE:
 487                         color = COLOR_MSG;
 488                         break;
 489                 default:
 490                         color = COLOR_ERRMSG;
 491         }
 492         PARA_VSPRINTF(fmt, msg);
 493         chop(msg);
 494         rb_add_entry(color, msg);
 495         wrefresh(bot.win);
 496 }
 497
 498 static void setup_signal_handling(void)
 499 {
 500         signal_pipe = para_signal_init();
 501         para_install_sighandler(SIGINT);
 502         para_install_sighandler(SIGTERM);
 503         para_install_sighandler(SIGCHLD);
 504         para_install_sighandler(SIGWINCH);
 505         para_install_sighandler(SIGUSR1);
 506         para_sigaction(SIGHUP, SIG_IGN);
 507 }
 508
 509 __noreturn static void do_exit(int ret)
 510 {
 511         para_sigaction(SIGTERM, SIG_IGN);
 512         kill(0, SIGTERM);
 513         exit(ret);
 514 }
 515
 516 static void shutdown_curses(void)
 517 {
 518         if (!curses_active)
 519                 return;
 520         def_prog_mode();
 521         curses_active = 0;
 522         endwin();
 523 }
 524
 525 __noreturn static void finish(int ret)
 526 {
 527         shutdown_curses();
 528         do_exit(ret);
 529 }
 530
 531 /*
 532  * exit curses and print given message to stdout/stderr
 533  */
 534 __noreturn __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 535 {
 536         va_list argp;
 537         FILE *outfd = ret? stderr: stdout;
 538
 539         shutdown_curses();
 540         va_start(argp, fmt);
 541         vfprintf(outfd, fmt, argp);
 542         va_end(argp);
 543         do_exit(ret);
 544 }
 545
 546 static void print_welcome(void)
 547 {
 548         if (loglevel > LL_NOTICE)
 549                 return;
 550         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 551                 " \"" CODENAME "\". Theme: %s", theme.name);
 552         wclrtoeol(bot.win);
 553 }
 554
 555 /*
 556  * init all windows
 557  */
 558 static void init_wins(int top_lines)
 559 {
 560         int i;
 561
 562         top.lines = top_lines;
 563         top.cols = COLS;
 564         top.begy = 0;
 565         top.begx = 0;
 566
 567         bot.lines = LINES - top.lines - 3;
 568         bot.cols = COLS;
 569         bot.begy = top.lines + 1;
 570         bot.begx = 0;
 571
 572         sb.lines = 1;
 573         sb.cols = COLS;
 574         sb.begy = LINES - 2;
 575         sb.begx = 0;
 576
 577         in.lines = 1;
 578         in.cols = COLS;
 579         in.begy = LINES - 1;
 580         in.begx = 0;
 581
 582         sep.lines = 1;
 583         sep.cols = COLS;
 584         sep.begy = top.lines;
 585         sep.begx = 0;
 586
 587         assume_default_colors(theme.default_fg, theme.default_bg);
 588         if (top.win) {
 589                 mvwin(top.win, top.begy, top.begx);
 590                 wresize(top.win, top.lines, top.cols);
 591
 592                 mvwin(sb.win, sb.begy, sb.begx);
 593                 wresize(sb.win, sb.lines, sb.cols);
 594
 595                 mvwin(sep.win, sep.begy, sep.begx);
 596                 wresize(sep.win, sep.lines, sep.cols);
 597
 598                 mvwin(bot.win, bot.begy, bot.begx);
 599                 wresize(bot.win, bot.lines, bot.cols);
 600
 601                 mvwin(in.win, in.begy, in.begx);
 602                 wresize(in.win, in.lines, in.cols);
 603         } else {
 604                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 605                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 606                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 607                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 608                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 609                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 610                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 611                 wclear(bot.win);
 612                 wclear(sb.win);
 613                 wclear(in.win);
 614                 scrollok(bot.win, 1);
 615                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 616                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 617                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 618                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 619                 nodelay(top.win, 1);
 620                 nodelay(bot.win, 1);
 621                 nodelay(sb.win, 1);
 622                 nodelay(in.win, 0);
 623
 624                 keypad(top.win, 1);
 625                 keypad(bot.win, 1);
 626                 keypad(sb.win, 1);
 627                 keypad(in.win, 1);
 628                 print_status_bar();
 629         }
 630         wmove(sep.win, 0, 0);
 631         for (i = 1; i <= COLS; i++)
 632                 waddstr(sep.win, theme.sep_str);
 633         wclear(top.win);
 634         //wclear(bot.win);
 635         wnoutrefresh(top.win);
 636         wnoutrefresh(bot.win);
 637         //wnoutrefresh(sb.win);
 638         print_status_bar();
 639         wnoutrefresh(in.win);
 640         wnoutrefresh(sep.win);
 641         doupdate();
 642 }
 643
 644 static void check_geometry(void)
 645 {
 646         if (LINES < theme.lines_min || COLS < theme.cols_min)
 647                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 648                         " (need at least %dx%d)\n", COLS, LINES,
 649                         theme.cols_min, theme.lines_min);
 650 }
 651
 652 /*
 653  * Print stat item #i to curses window
 654  */
 655 static void print_stat_item(int i)
 656 {
 657         char *tmp;
 658         struct stat_item_data d = theme.data[i];
 659         char *c = stat_content[i];
 660
 661         if (!curses_active || !d.len || !c)
 662                 return;
 663         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 664         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 665         wrefresh(top.win);
 666         wattron(top.win, COLOR_PAIR(i + 1));
 667         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 668         free(tmp);
 669         wrefresh(top.win);
 670 }
 671
 672 /*
 673  * print status line if line starts with known command.
 674  */
 675 static int update_item(int item_num, char *buf)
 676 {
 677         free(stat_content[item_num]);
 678         stat_content[item_num] = para_strdup(buf);
 679         print_stat_item(item_num);
 680         return 1;
 681 }
 682
 683 static int read_audiod_pipe(int fd)
 684 {
 685         static char buf[8192];
 686         static int loaded;
 687         int ret;
 688
 689         if (loaded >= sizeof(buf)) /* overflow */
 690                 return 0;
 691         ret = read(fd, buf + loaded, sizeof(buf) - loaded);
 692         if (ret <= 0)
 693                 return ret;
 694         loaded += ret;
 695         ret = for_each_stat_item(buf, loaded, update_item);
 696         if (ret < 0)
 697                 return ret;
 698         loaded = ret;
 699         return 1;
 700 }
 701
 702 static void print_all_items(void)
 703 {
 704         int i;
 705
 706         if (!curses_active)
 707                 return;
 708         FOR_EACH_STATUS_ITEM(i)
 709                 print_stat_item(i);
 710 }
 711
 712 static void clear_all_items(void)
 713 {
 714         int i;
 715
 716         FOR_EACH_STATUS_ITEM(i) {
 717                 free(stat_content[i]);
 718                 stat_content[i] = para_strdup("");
 719         }
 720 }
 721
 722 static void init_colors(void)
 723 {
 724         int i;
 725
 726         if (!has_colors())
 727                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 728         start_color();
 729         FOR_EACH_STATUS_ITEM(i)
 730                 if (theme.data[i].len)
 731                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 732         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 733         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 734         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 735         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 736         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 737         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 738         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 739         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 740         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 741 }
 742
 743 /*
 744  * (re-)initialize the curses library  FIXME: Error checking
 745  */
 746 static void init_curses(void)
 747 {
 748         curses_active = 1;
 749         if (top.win && refresh() == ERR) { /* refesh is really needed */
 750                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 751         }
 752         check_geometry();
 753         curs_set(0); /* make cursor invisible, ignore errors */
 754 //      if (noraw() == ERR);
 755 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 756 //                      "raw mode\n");
 757         nonl(); /* tell curses not to do NL->CR/NL on output */
 758         noecho(); /* don't echo input */
 759         cbreak(); /* take input chars one at a time, no wait for \n */
 760         //reset_prog_mode();
 761         init_colors();
 762         clear();
 763         init_wins(theme.top_lines_default);
 764         print_all_items();
 765         noecho(); /* don't echo input */
 766 }
 767
 768
 769 static void check_sigchld(void)
 770 {
 771         int ret;
 772         pid_t pid;
 773 reap_next_child:
 774         ret = para_reap_child(&pid);
 775         if (ret <= 0)
 776                 return;
 777         if (pid == cmd_pid) {
 778                 cmd_pid = 0;
 779                 cmd_died = 1;
 780         }
 781         goto reap_next_child;
 782 }
 783
 784 /*
 785  * This sucker modifies its first argument. *handler and *arg are
 786  * pointers to 0-terminated strings (inside line). Crap.
 787  */
 788 static int split_key_map(char *line, char **handler, char **arg)
 789 {
 790         if (!(*handler = strchr(line + 1, ':')))
 791                 goto err_out;
 792         **handler = '\0';
 793         (*handler)++;
 794         if (!(*arg = strchr(*handler, ':')))
 795                 goto err_out;
 796         **arg = '\0';
 797         (*arg)++;
 798         return 1;
 799 err_out:
 800         return 0;
 801 }
 802
 803 static int check_key_map_args(void)
 804 {
 805         char *s;
 806         int i, ret = -1;
 807         char *tmp = NULL, *handler, *arg;
 808
 809         for (i = 0; i < conf.key_map_given; ++i) {
 810                 s = conf.key_map_arg[i];
 811                 if (!(*s))
 812                         goto err_out;
 813                 free(tmp);
 814                 tmp = para_strdup(s);
 815                 if (!split_key_map(tmp, &handler, &arg))
 816                         goto err_out;
 817                 if (strlen(handler) != 1)
 818                         goto err_out;
 819                 if (*handler != 'x'
 820                         && *handler != 'd'
 821                         && *handler != 'i'
 822                         && *handler != 'p')
 823                         goto err_out;
 824                 if (*handler != 'i')
 825                         continue;
 826                 if (find_cmd_byname(arg) < 0)
 827                         goto err_out;
 828         }
 829         ret = 0;
 830 err_out:
 831         free(tmp);
 832         return ret;
 833 }
 834
 835 /*
 836  * React to various signal-related events
 837  */
 838 static void handle_signal(int sig)
 839 {
 840         switch (sig) {
 841         case SIGTERM:
 842                 msg_n_exit(EXIT_FAILURE,
 843                         "only the good die young (caught SIGTERM))\n");
 844                 return;
 845         case SIGWINCH:
 846                 if (curses_active) {
 847                         shutdown_curses();
 848                         init_curses();
 849                         redraw_bot_win();
 850                 }
 851                 return;
 852         case SIGINT:
 853                 PARA_WARNING_LOG("caught SIGINT, reset");
 854                 /* Nothing to do. SIGINT killed our child which gets noticed
 855                  * by do_select and resets everything.
 856                  */
 857                 return;
 858         case SIGUSR1:
 859                 PARA_NOTICE_LOG("got SIGUSR1, rereading configuration");
 860                 com_reread_conf();
 861                 return;
 862         case SIGCHLD:
 863                 check_sigchld();
 864                 return;
 865         }
 866 }
 867
 868 static int open_audiod_pipe(void)
 869 {
 870         static int init = 1;
 871
 872         if (init)
 873                 init = 0;
 874         else
 875                 sleep(1);
 876         return para_open_audiod_pipe(conf.stat_cmd_arg);
 877 }
 878
 879 /*
 880  * This is the core select loop. Besides the (internal) signal
 881  * pipe, the following other fds are checked according to the mode:
 882  *
 883  * GETCH_MODE: check stdin, return when key is pressed
 884  *
 885  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 886  * of output has been read or when other end has closed command pipe or
 887  * when any key is pressed.
 888  *
 889  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 890  * is running. During that time curses is disabled.  Returns when
 891  * cmd_pid == 0.
 892  */
 893 static int do_select(int mode)
 894 {
 895         fd_set rfds;
 896         int ret;
 897         int max_fileno, cp_numread = 1;
 898         char command_buf[4096] = "";
 899         int cbo = 0; /* command buf offset */
 900         struct timeval tv;
 901 repeat:
 902         tv.tv_sec = conf.timeout_arg  / 1000;
 903         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 904 //      ret = refresh_status();
 905         FD_ZERO(&rfds);
 906         max_fileno = 0;
 907         /* audiod pipe */
 908         if (audiod_pipe < 0)
 909                 audiod_pipe = open_audiod_pipe();
 910         if (audiod_pipe >= 0)
 911                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 912         /* signal pipe */
 913         para_fd_set(signal_pipe, &rfds, &max_fileno);
 914         /* command pipe only for COMMAND_MODE */
 915         if (command_pipe >= 0 && mode == COMMAND_MODE)
 916                 para_fd_set(command_pipe, &rfds, &max_fileno);
 917         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 918         if (ret <= 0)
 919                 goto check_return; /* skip fd checks */
 920         /* signals */
 921         if (FD_ISSET(signal_pipe, &rfds)) {
 922                 int sig_nr = para_next_signal();
 923                 if (sig_nr > 0)
 924                         handle_signal(sig_nr);
 925         }
 926         /* read command pipe if ready */
 927         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 928                         FD_ISSET(command_pipe, &rfds)) {
 929                 cp_numread = read(command_pipe, command_buf + cbo,
 930                         sizeof(command_buf) - 1 - cbo);
 931                 if (cp_numread >= 0)
 932                         cbo += cp_numread;
 933                 else {
 934                         if (cp_numread < 0)
 935                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 936                         close(command_pipe);
 937                         command_pipe = -1;
 938                 }
 939         }
 940         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 941                 if (read_audiod_pipe(audiod_pipe) <= 0) {
 942                         close(audiod_pipe);
 943                         audiod_pipe = -1;
 944                         clear_all_items();
 945                         free(stat_content[SI_BASENAME]);
 946                         stat_content[SI_BASENAME] =
 947                                 para_strdup("audiod not running!?");
 948                         print_all_items();
 949                 }
 950 check_return:
 951         switch (mode) {
 952         case COMMAND_MODE:
 953                 if (cp_numread <= 0 && !cbo) /* command complete */
 954                         return 0;
 955                 if (cbo)
 956                         cbo = for_each_line(command_buf, cbo,
 957                                 &add_output_line, NULL);
 958                 if (cp_numread <= 0)
 959                         cbo = 0;
 960                 wrefresh(bot.win);
 961                 ret = wgetch(top.win);
 962                 if (ret != ERR && ret != KEY_RESIZE) {
 963                         if (command_pipe) {
 964                                 close(command_pipe);
 965                                 command_pipe = -1;
 966                         }
 967                         if (cmd_pid)
 968                                 kill(cmd_pid, SIGTERM);
 969                         return -1;
 970                 }
 971                 break;
 972         case GETCH_MODE:
 973                 ret = wgetch(top.win);
 974                 if (ret != ERR && ret != KEY_RESIZE)
 975                         return ret;
 976                 break;
 977         case EXTERNAL_MODE:
 978                 if (cmd_died) {
 979                         cmd_died = 0;
 980                         return 0;
 981                 }
 982         }
 983         goto repeat;
 984 }
 985
 986 /*
 987  * read from command pipe and print data to bot window
 988  */
 989 static int send_output(void)
 990 {
 991         int ret;
 992
 993         if (command_pipe < 0)
 994                 return 0;
 995         ret = mark_fd_nonblocking(command_pipe);
 996         if (ret < 0) {
 997                 close(command_pipe);
 998                 return ret;
 999         }
1000         if (do_select(COMMAND_MODE) >= 0)
1001                 PARA_INFO_LOG("command complete");
1002         else
1003                 PARA_NOTICE_LOG("command aborted");
1004         print_in_bar(COLOR_MSG, " ");
1005         return 1;
1006 }
1007
1008 static int client_cmd_cmdline(char *cmd)
1009 {
1010         int ret, fds[3] = {0, 1, 0};
1011         char *c = make_message(BINDIR "/para_client -- %s", cmd);
1012
1013         outputf(COLOR_COMMAND, "%s", c);
1014         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
1015         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
1016         free(c);
1017         if (ret < 0)
1018                 return -1;
1019         command_pipe = fds[1];
1020         return send_output();
1021 }
1022
1023 /*
1024  * exec command and print output to bot win
1025  */
1026 static int display_cmd(char *cmd)
1027 {
1028         int fds[3] = {0, 1, 0};
1029
1030         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1031         outputf(COLOR_COMMAND, "%s", cmd);
1032         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1033                 return -1;
1034         command_pipe = fds[1];
1035         return send_output();
1036 }
1037
1038 /*
1039  * shutdown curses and stat pipe before executing external commands
1040  */
1041 static int external_cmd(char *cmd)
1042 {
1043         int fds[3] = {-1, -1, -1};
1044
1045         if (cmd_pid)
1046                 return -1;
1047         shutdown_curses();
1048         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1049         cmd_died = 0;
1050         do_select(EXTERNAL_MODE);
1051         init_curses();
1052         return 0;
1053 }
1054
1055 static void print_scroll_msg(void)
1056 {
1057         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1058         int first_rbe = first_visible_rbe(&lines_total);
1059         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1060                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1061 }
1062
1063 static void com_page_down(void)
1064 {
1065         unsigned lines = 0;
1066         int i = scroll_position;
1067         while (lines < bot.lines && --i > 0) {
1068                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1069                 if (!rbe)
1070                         break;
1071                 lines += NUM_LINES(strlen(rbe->msg));
1072         }
1073         if (lines) {
1074                 scroll_position = i;
1075                 redraw_bot_win();
1076                 print_scroll_msg();
1077                 return;
1078         }
1079         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1080 }
1081
1082 static void com_page_up(void)
1083 {
1084         unsigned lines;
1085         int fvr = first_visible_rbe(&lines);
1086
1087         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1088                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1089                 return;
1090         }
1091         scroll_position = fvr + 1;
1092         for (; scroll_position > 0; scroll_position--) {
1093                 first_visible_rbe(&lines);
1094                 if (lines == bot.lines)
1095                         break;
1096         }
1097         redraw_bot_win();
1098         print_scroll_msg();
1099 }
1100
1101 static void com_scroll_down(void)
1102 {
1103         struct rb_entry *rbe;
1104         int rbe_lines;
1105
1106         if (!scroll_position) {
1107                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1108                 return;
1109         }
1110         scroll_position--;
1111         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1112         rbe_lines = NUM_LINES(rbe->len);
1113         wscrl(bot.win, rbe_lines);
1114         wmove(bot.win, bot.lines - rbe_lines, 0);
1115         wattron(bot.win, COLOR_PAIR(rbe->color));
1116         waddstr(bot.win, rbe->msg);
1117         wrefresh(bot.win);
1118         print_scroll_msg();
1119 }
1120
1121 static void com_scroll_up(void)
1122 {
1123         struct rb_entry *rbe = NULL;
1124         unsigned lines;
1125         int i, first_rbe, num_scroll;
1126
1127         /* the entry that is going to vanish */
1128         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1129         if (!rbe)
1130                 goto err_out;
1131         num_scroll = NUM_LINES(rbe->len);
1132         first_rbe = first_visible_rbe(&lines);
1133         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1134                 goto err_out;
1135         scroll_position++;
1136         wscrl(bot.win, -num_scroll);
1137         i = draw_top_rbe(&lines);
1138         if (i < 0)
1139                 goto err_out;
1140         while (i > 0 && lines < num_scroll) {
1141                 int rbe_lines;
1142                 rbe = ringbuffer_get(bot_win_rb, --i);
1143                 if (!rbe)
1144                         break;
1145                 rbe_lines = NUM_LINES(rbe->len);
1146                 lines += rbe_lines;
1147 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1148                 wattron(bot.win, COLOR_PAIR(rbe->color));
1149                 waddstr(bot.win, "\n");
1150                 waddstr(bot.win, rbe->msg);
1151                 if (!i)
1152                         break;
1153                 i--;
1154         }
1155         wrefresh(bot.win);
1156         print_scroll_msg();
1157         return;
1158 err_out:
1159         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1160 }
1161
1162 static void com_ll_decr(void)
1163 {
1164         if (loglevel <= LL_DEBUG) {
1165                 print_in_bar(COLOR_ERRMSG,
1166                         "loglevel already at maximal verbosity\n");
1167                 return;
1168         }
1169         loglevel--;
1170         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1171 }
1172
1173 static void com_ll_incr(void)
1174 {
1175         if (loglevel >= LL_EMERG) {
1176                 print_in_bar(COLOR_ERRMSG,
1177                         "loglevel already at minimal verbosity\n");
1178                 return;
1179         }
1180         loglevel++;
1181         print_in_bar(COLOR_MSG, "loglevel set to %d\n", loglevel);
1182 }
1183
1184 /*
1185  * reread configuration, terminate on errors
1186  */
1187 static void com_reread_conf(void)
1188 {
1189         char *cf =configfile_exists();
1190         struct gui_cmdline_parser_params params = {
1191                 .override = 1,
1192                 .initialize = 1,
1193                 .check_required = 0,
1194                 .check_ambiguity = 0
1195         };
1196
1197         if (!cf) {
1198                 PARA_WARNING_LOG("there is no configuration to read");
1199                 return;
1200         }
1201         PARA_INFO_LOG("rereading command line options and config file");
1202         gui_cmdline_parser(_argc, _argv, &conf);
1203         gui_cmdline_parser_config_file(cf, &conf, &params);
1204         PARA_NOTICE_LOG("config file reloaded");
1205         if (check_key_map_args() < 0)
1206                 finish(EXIT_FAILURE);
1207 }
1208
1209 static void com_help(void)
1210 {
1211         int i;
1212
1213         for (i = 0; i < conf.key_map_given; ++i) {
1214                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1215                 const char *handler_text = "???", *desc = NULL;
1216
1217                 if (!split_key_map(tmp, &handler, &arg)) {
1218                         free(tmp);
1219                         return;
1220                 }
1221                 switch (*handler) {
1222                         case 'i':
1223                                 handler_text = "internal";
1224                                 desc = command_list[find_cmd_byname(arg)].description;
1225                                 break;
1226                         case 'x': handler_text = "external"; break;
1227                         case 'd': handler_text = "display "; break;
1228                         case 'p': handler_text = "para    "; break;
1229                 }
1230                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1231                         strlen(arg) < 8? "\t" : "",
1232                         desc? desc : "");
1233                 free(tmp);
1234         }
1235         for (i = 0; command_list[i].handler; i++) {
1236                 struct gui_command gc = command_list[i];
1237
1238                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1239                         strlen(gc.name) < 8? "\t" : "",
1240                         gc.description);
1241         }
1242         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1243                 "for more info");
1244 }
1245
1246 static void com_shrink_top_win(void)
1247 {
1248         if (top.lines <= theme.top_lines_min) {
1249                 PARA_WARNING_LOG("can not decrease top window");
1250                 return;
1251         }
1252         init_wins(top.lines - 1);
1253         wclear(top.win);
1254         print_all_items();
1255         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1256 }
1257
1258 static void com_enlarge_top_win(void)
1259 {
1260         if (bot.lines < 3) {
1261                 PARA_WARNING_LOG("can not increase top window");
1262                 return;
1263         }
1264         init_wins(top.lines + 1);
1265         wclear(top.win);
1266         print_all_items();
1267         print_in_bar(COLOR_MSG, "increased top window");
1268 }
1269
1270 static void com_version(void)
1271 {
1272         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1273                 CODENAME "\"");
1274 }
1275
1276 __noreturn static void com_quit(void)
1277 {
1278         finish(0);
1279 }
1280
1281 static void com_refresh(void)
1282 {
1283         shutdown_curses();
1284         init_curses();
1285 }
1286
1287 static void change_theme(int next)
1288 {
1289         if (next)
1290                 next_theme(&theme);
1291         else
1292                 prev_theme(&theme);
1293         /* This seems to be needed twice, why? */
1294         com_refresh();
1295         com_refresh();
1296         PARA_NOTICE_LOG("new theme: %s", theme.name);
1297 }
1298
1299 static void com_next_theme(void)
1300 {
1301         change_theme(1);
1302 }
1303
1304 static void com_prev_theme(void)
1305 {
1306         change_theme(0);
1307 }
1308
1309
1310 static void handle_command(int c)
1311 {
1312         int i;
1313
1314         /* first check user's key bindings */
1315         for (i = 0; i < conf.key_map_given; ++i) {
1316                 char tmp[MAXLINE], *handler, *arg;
1317
1318                 strcpy(tmp, conf.key_map_arg[i]);
1319                 if (!split_key_map(tmp, &handler, &arg))
1320                         return;
1321                 if (!strcmp(tmp, km_keyname(c))) {
1322                         if (*handler == 'd') {
1323                                 display_cmd(arg);
1324                                 return;
1325                         }
1326                         if (*handler == 'x') {
1327                                 external_cmd(arg);
1328                                 return;
1329                         }
1330                         if (*handler == 'p') {
1331                                 client_cmd_cmdline(arg);
1332                                 return;
1333                         }
1334                         if (*handler == 'i') {
1335                                 int num = find_cmd_byname(arg);
1336                                 if (num >= 0)
1337                                         command_list[num].handler();
1338                                 return;
1339                         }
1340                 }
1341         }
1342         /* not found, check internal key bindings */
1343         for (i = 0; command_list[i].handler; i++) {
1344                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1345                         command_list[i].handler();
1346                         return;
1347                 }
1348         }
1349         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1350                 km_keyname(c));
1351 }
1352
1353 int main(int argc, char *argv[])
1354 {
1355         int ret;
1356         char *cf;
1357
1358         _argc = argc;
1359         _argv = argv;
1360
1361         if (gui_cmdline_parser(argc, argv, &conf)) {
1362                 fprintf(stderr, "parse error while reading command line\n");
1363                 exit(EXIT_FAILURE);
1364         }
1365         HANDLE_VERSION_FLAG("gui", conf);
1366         init_theme(0, &theme);
1367         top.lines = theme.top_lines_default;
1368         if (check_key_map_args() < 0) {
1369                 fprintf(stderr, "invalid key map\n");
1370                 exit(EXIT_FAILURE);
1371         }
1372         cf = configfile_exists();
1373         if (!cf && conf.config_file_given) {
1374                 fprintf(stderr, "can not read config file %s\n",
1375                         conf.config_file_arg);
1376                 exit(EXIT_FAILURE);
1377         }
1378         if (cf) {
1379                 struct gui_cmdline_parser_params params = {
1380                         .override = 0,
1381                         .initialize = 0,
1382                         .check_required = 0,
1383                         .check_ambiguity = 0
1384                 };
1385                 gui_cmdline_parser_config_file(cf, &conf, &params);
1386         }
1387         loglevel = get_loglevel_by_name(conf.loglevel_arg);
1388         if (check_key_map_args() < 0) {
1389                 fprintf(stderr, "invalid key map in config file\n");
1390                 exit(EXIT_FAILURE);
1391         }
1392         setup_signal_handling();
1393         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1394         initscr(); /* needed only once, always successful */
1395         init_curses();
1396         print_welcome();
1397         for (;;) {
1398                 print_status_bar();
1399                 ret = do_select(GETCH_MODE);
1400                 if (!ret)
1401                         continue;
1402                 print_in_bar(COLOR_MSG, " ");
1403                 handle_command(ret);
1404         }
1405 }