gui.c

   1 /*
   2  * Copyright (C) 1998-2007 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file gui.c ncurses-based interface for paraslash */
   8
   9 #include "gui.cmdline.h"
  10 #include "para.h"
  11 #include "gui.h"
  12 #include <curses.h>
  13 #include "ringbuffer.h"
  14 #include "gui_common.h"
  15 #include "fd.h"
  16 #include "error.h"
  17 #include "list.h"
  18 #include "sched.h"
  19 #include "signal.h"
  20
  21 /** define the array of error lists needed by para_gui */
  22 INIT_GUI_ERRLISTS;
  23 extern const char *status_item_list[NUM_STAT_ITEMS];
  24 static char *stat_content[NUM_STAT_ITEMS];
  25
  26 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  27
  28 static int signal_pipe;
  29
  30 static void finish(int sig);
  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 void *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 32
  62 #define COLOR_COMMAND 33
  63 #define COLOR_OUTPUT 34
  64 #define COLOR_MSG 35
  65 #define COLOR_ERRMSG 36
  66 #define COLOR_WELCOME 37
  67 #define COLOR_SEPARATOR 38
  68 #define COLOR_TOP 39
  69 #define COLOR_BOT 40
  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 find_cmd_byname(char *name)
 193 {
 194         int i;
 195
 196         for (i = 0; command_list[i].handler; i++)
 197                 if (!strcmp(command_list[i].name, name))
 198                         return i;
 199         return -1;
 200 }
 201
 202 /* taken from mutt */
 203 static char *km_keyname(int c)
 204 {
 205         static char buf[10];
 206
 207         if (c == KEY_UP) {
 208                 sprintf(buf, "<up>");
 209                 return buf;
 210         }
 211         if (c == KEY_DOWN) {
 212                 sprintf(buf, "<down>");
 213                 return buf;
 214         }
 215         if (c == KEY_LEFT) {
 216                 sprintf(buf, "<left>");
 217                 return buf;
 218         }
 219         if (c == KEY_RIGHT) {
 220                 sprintf(buf, "<right>");
 221                 return buf;
 222         }
 223         if (c == KEY_NPAGE) {
 224                 sprintf(buf, "<npage>");
 225                 return buf;
 226         }
 227         if (c == KEY_PPAGE) {
 228                 sprintf(buf, "<ppage>");
 229                 return buf;
 230         }
 231         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 232                 if (c < 0)
 233                         c += 256;
 234                 if (c < 128) {
 235                         buf[0] = '^';
 236                         buf[1] = (c + '@') & 0x7f;
 237                         buf[2] = 0;
 238                 } else
 239                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 240                                 (c >> 3) & 7, c & 7);
 241         } else if (c >= KEY_F0 && c < KEY_F(256))
 242                 sprintf(buf, "<F%d>", c - KEY_F0);
 243         else if (isprint(c))
 244                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 245         else
 246                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 247         return buf;
 248 }
 249
 250 static char *configfile_exists(void)
 251 {
 252         static char *config_file;
 253         char *tmp;
 254
 255         if (!conf.config_file_given) {
 256                 if (!config_file) {
 257                         char *home = para_homedir();
 258                         config_file = make_message("%s/.paraslash/gui.conf",
 259                                 home);
 260                         free(home);
 261                 }
 262                 tmp = config_file;
 263         } else
 264                 tmp = conf.config_file_arg;
 265         return file_exists(tmp)? tmp: NULL;
 266 }
 267
 268 /*
 269  * print num spaces to curses window
 270  */
 271 static void add_spaces(WINDOW* win, unsigned int num)
 272 {
 273         while (num > 0) {
 274                 num--;
 275                 waddstr(win, " ");
 276         }
 277 }
 278
 279 /*
 280  * print aligned string to curses window. This function always prints
 281  * exactly len chars.
 282  */
 283 static int align_str(WINDOW* win, const char *string, unsigned int len,
 284                 unsigned int align)
 285 {
 286         int num; /* of spaces */
 287         char *str;
 288
 289         if (!win || !string)
 290                 return -1;
 291         num = len - strlen(string);
 292         str = para_strdup(string);
 293         if (num < 0) {
 294                 str[len] = '\0';
 295                 num = 0;
 296         }
 297         if (align == LEFT) {
 298                 waddstr(win, str);
 299                 add_spaces(win, num);
 300         } else if (align == RIGHT) {
 301                 add_spaces(win, num);
 302                 waddstr(win, str);
 303         } else {
 304                 add_spaces(win, num / 2);
 305                 waddstr(win, str[0]? str: "");
 306                 add_spaces(win, num - num / 2);
 307         }
 308         free(str);
 309         return 1;
 310 }
 311
 312 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 313 {
 314         char *msg;
 315
 316         if (!curses_active)
 317                 return;
 318         wattron(in.win, COLOR_PAIR(color));
 319         PARA_VSPRINTF(fmt, msg);
 320         wmove(in.win, 0, 0);
 321         align_str(in.win, msg, sb.cols, LEFT);
 322         free(msg);
 323         wrefresh(in.win);
 324 }
 325
 326 /*
 327  * update the status bar
 328  */
 329 static void print_status_bar(void)
 330 {
 331         if (!curses_active)
 332                 return;
 333         wmove(sb.win, 0, 0);
 334         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 335         wrefresh(sb.win);
 336 }
 337
 338 /*
 339  * get the number of the oldest rbe that is (partially) visible. On return,
 340  * lines contains the sum of the number of lines of all visable entries. If the
 341  * first one is only partially visible, lines is greater than bot.lines.
 342  */
 343 static int first_visible_rbe(unsigned *lines)
 344 {
 345         int i;
 346         *lines = 0;
 347         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 348                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 349                 int rbe_lines;
 350                 if (!rbe)
 351                         return i - 1;
 352 //              fprintf(stderr, "found: %s\n", rbe->msg);
 353                 rbe_lines = NUM_LINES(rbe->len);
 354                 if (rbe_lines > bot.lines)
 355                         return -1;
 356                 *lines += rbe_lines;
 357                 if (*lines >= bot.lines)
 358                         return i;
 359         }
 360         return RINGBUFFER_SIZE - 1;
 361 }
 362
 363 static int draw_top_rbe(unsigned *lines)
 364 {
 365         unsigned len;
 366         int offset, fvr = first_visible_rbe(lines);
 367         struct rb_entry *rbe;
 368
 369         if (fvr < 0)
 370                 return -1;
 371         wmove(bot.win, 0, 0);
 372         rbe = ringbuffer_get(bot_win_rb, fvr);
 373         if (!rbe)
 374                 return -1;
 375         /* first rbe might be only partially visible */
 376         offset = (*lines - bot.lines) * bot.cols;
 377         len = strlen(rbe->msg);
 378         if (offset < 0 || len < offset)
 379                 return -1;
 380         wattron(bot.win, COLOR_PAIR(rbe->color));
 381         waddstr(bot.win, rbe->msg + offset);
 382         *lines = NUM_LINES(len - offset);
 383         return fvr;
 384 }
 385
 386 static void redraw_bot_win(void)
 387 {
 388         unsigned lines;
 389         int i;
 390
 391         wmove(bot.win, 0, 0);
 392         wclear(bot.win);
 393         i = draw_top_rbe(&lines);
 394         if (i <= 0)
 395                 goto out;
 396         while (i > 0 && lines < bot.lines) {
 397                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 398                 if (!rbe) {
 399                         lines++;
 400                         waddstr(bot.win, "\n");
 401                         continue;
 402                 }
 403                 lines += NUM_LINES(rbe->len);
 404                 wattron(bot.win, COLOR_PAIR(rbe->color));
 405                 waddstr(bot.win, "\n");
 406                 waddstr(bot.win, rbe->msg);
 407         }
 408 out:
 409         wrefresh(bot.win);
 410 }
 411
 412 static void rb_add_entry(int color, char *msg)
 413 {
 414         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 415         int x, y;
 416         new->color = color;
 417         new->len = strlen(msg);
 418         new->msg = msg;
 419         old = ringbuffer_add(bot_win_rb, new);
 420 //      fprintf(stderr, "added: %s\n", new->msg);
 421         if (old) {
 422                 free(old->msg);
 423                 free(old);
 424         }
 425         if (scroll_position) {
 426                 /* discard current scrolling, like xterm does */
 427                 scroll_position = 0;
 428                 redraw_bot_win();
 429                 return;
 430         }
 431         wattron(bot.win, COLOR_PAIR(color));
 432         getyx(bot.win, y, x);
 433         if (y || x)
 434                 waddstr(bot.win, "\n");
 435         waddstr(bot.win, msg);
 436 }
 437
 438 /*
 439  * print formated output to bot win and refresh
 440  */
 441 __printf_2_3 static void outputf(int color, const char* fmt,...)
 442 {
 443         char *msg;
 444
 445         if (!curses_active)
 446                 return;
 447         PARA_VSPRINTF(fmt, msg);
 448         rb_add_entry(color, msg);
 449         wrefresh(bot.win);
 450 }
 451
 452 static int add_output_line(char *line, __a_unused void *data)
 453 {
 454         if (!curses_active)
 455                 return 1;
 456         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 457         return 1;
 458 }
 459
 460 void para_log(int ll, const char *fmt,...)
 461 {
 462         int color;
 463         char *msg;
 464
 465         if (ll < conf.loglevel_arg || !curses_active)
 466                 return;
 467         switch (ll) {
 468                 case DEBUG:
 469                 case INFO:
 470                 case NOTICE:
 471                         color = COLOR_MSG;
 472                         break;
 473                 default:
 474                         color = COLOR_ERRMSG;
 475         }
 476         PARA_VSPRINTF(fmt, msg);
 477         chop(msg);
 478         rb_add_entry(color, msg);
 479         wrefresh(bot.win);
 480 }
 481
 482 static void setup_signal_handling(void)
 483 {
 484         signal_pipe = para_signal_init();
 485         para_install_sighandler(SIGINT);
 486         para_install_sighandler(SIGTERM);
 487         para_install_sighandler(SIGCHLD);
 488         para_install_sighandler(SIGWINCH);
 489         para_install_sighandler(SIGUSR1);
 490         signal(SIGPIPE, SIG_IGN);
 491         signal(SIGHUP, SIG_IGN);
 492 }
 493
 494 static void do_exit(int ret)
 495 {
 496         signal(SIGTERM, SIG_IGN);
 497         kill(0, SIGTERM);
 498         exit(ret);
 499 }
 500
 501 static void shutdown_curses(void)
 502 {
 503         if (!curses_active)
 504                 return;
 505         def_prog_mode();
 506         curses_active = 0;
 507         endwin();
 508 }
 509
 510 static void finish(int ret)
 511 {
 512         shutdown_curses();
 513         do_exit(ret);
 514 }
 515
 516 /*
 517  * exit curses and print given message to stdout/stderr
 518  */
 519 __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 520 {
 521         va_list argp;
 522         FILE *outfd = ret? stderr: stdout;
 523
 524         shutdown_curses();
 525         va_start(argp, fmt);
 526         vfprintf(outfd, fmt, argp);
 527         va_end(argp);
 528         do_exit(ret);
 529 }
 530
 531 static void print_welcome(void)
 532 {
 533         int ll = conf.loglevel_arg;
 534         if (ll > NOTICE)
 535                 return;
 536         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 537                 " \"" CODENAME "\". Theme: %s", theme.name);
 538         wclrtoeol(bot.win);
 539 }
 540
 541 /*
 542  * init all windows
 543  */
 544 static void init_wins(int top_lines)
 545 {
 546         int i;
 547
 548         top.lines = top_lines;
 549         top.cols = COLS;
 550         top.begy = 0;
 551         top.begx = 0;
 552
 553         bot.lines = LINES - top.lines - 3;
 554         bot.cols = COLS;
 555         bot.begy = top.lines + 1;
 556         bot.begx = 0;
 557
 558         sb.lines = 1;
 559         sb.cols = COLS;
 560         sb.begy = LINES - 2;
 561         sb.begx = 0;
 562
 563         in.lines = 1;
 564         in.cols = COLS;
 565         in.begy = LINES - 1;
 566         in.begx = 0;
 567
 568         sep.lines = 1;
 569         sep.cols = COLS;
 570         sep.begy = top.lines;
 571         sep.begx = 0;
 572
 573         assume_default_colors(theme.default_fg, theme.default_bg);
 574         if (top.win) {
 575                 mvwin(top.win, top.begy, top.begx);
 576                 wresize(top.win, top.lines, top.cols);
 577
 578                 mvwin(sb.win, sb.begy, sb.begx);
 579                 wresize(sb.win, sb.lines, sb.cols);
 580
 581                 mvwin(sep.win, sep.begy, sep.begx);
 582                 wresize(sep.win, sep.lines, sep.cols);
 583
 584                 mvwin(bot.win, bot.begy, bot.begx);
 585                 wresize(bot.win, bot.lines, bot.cols);
 586
 587                 mvwin(in.win, in.begy, in.begx);
 588                 wresize(in.win, in.lines, in.cols);
 589         } else {
 590                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 591                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 592                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 593                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 594                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 595                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 596                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 597                 wclear(bot.win);
 598                 wclear(sb.win);
 599                 wclear(in.win);
 600                 scrollok(bot.win, 1);
 601                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 602                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 603                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 604                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 605                 nodelay(top.win, 1);
 606                 nodelay(bot.win, 1);
 607                 nodelay(sb.win, 1);
 608                 nodelay(in.win, 0);
 609
 610                 keypad(top.win, 1);
 611                 keypad(bot.win, 1);
 612                 keypad(sb.win, 1);
 613                 keypad(in.win, 1);
 614                 print_status_bar();
 615         }
 616         wmove(sep.win, 0, 0);
 617         for (i = 1; i <= COLS; i++)
 618                 waddstr(sep.win, theme.sep_str);
 619         wclear(top.win);
 620         //wclear(bot.win);
 621         wnoutrefresh(top.win);
 622         wnoutrefresh(bot.win);
 623         //wnoutrefresh(sb.win);
 624         print_status_bar();
 625         wnoutrefresh(in.win);
 626         wnoutrefresh(sep.win);
 627         doupdate();
 628 }
 629
 630 static void check_geometry(void)
 631 {
 632         if (LINES < theme.lines_min || COLS < theme.cols_min)
 633                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 634                         " (need at least %dx%d)\n", COLS, LINES,
 635                         theme.cols_min, theme.lines_min);
 636 }
 637
 638 /*
 639  * Print stat item #i to curses window
 640  */
 641 static void print_stat_item(int i)
 642 {
 643         char *tmp;
 644         struct stat_item_data d = theme.data[i];
 645         char *c = stat_content[i];
 646
 647         if (!curses_active || !d.len || !c)
 648                 return;
 649         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 650 //      PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
 651         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 652         wrefresh(top.win);
 653         wattron(top.win, COLOR_PAIR(i + 1));
 654         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 655         free(tmp);
 656         wrefresh(top.win);
 657 }
 658
 659 static void print_all_items(void)
 660 {
 661         int i;
 662
 663         if (!curses_active)
 664                 return;
 665         for (i = 0; i < NUM_STAT_ITEMS; i++)
 666                 print_stat_item(i);
 667 }
 668 static void clear_all_items(void)
 669 {
 670         int i;
 671
 672         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 673                 free(stat_content[i]);
 674                 stat_content[i] = para_strdup("");
 675         }
 676 }
 677
 678 static void init_colors(void)
 679 {
 680         int i;
 681         if (!has_colors())
 682                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 683         start_color();
 684         for (i = 0; i < NUM_STAT_ITEMS; i++)
 685                 if (theme.data[i].len)
 686                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 687         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 688         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 689         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 690         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 691         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 692         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 693         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 694         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 695         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 696 }
 697
 698 /*
 699  * (re-)initialize the curses library  FIXME: Error checking
 700  */
 701 static void init_curses(void)
 702 {
 703         curses_active = 1;
 704         if (top.win && refresh() == ERR) { /* refesh is really needed */
 705                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 706         }
 707         check_geometry();
 708         curs_set(0); /* make cursor invisible, ignore errors */
 709 //      if (noraw() == ERR);
 710 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 711 //                      "raw mode\n");
 712         nonl(); /* tell curses not to do NL->CR/NL on output */
 713         noecho(); /* don't echo input */
 714         cbreak(); /* take input chars one at a time, no wait for \n */
 715         //reset_prog_mode();
 716         init_colors();
 717         clear();
 718         init_wins(theme.top_lines_default);
 719         print_all_items();
 720         noecho(); /* don't echo input */
 721 }
 722
 723
 724 static void check_sigchld(void)
 725 {
 726         pid_t pid;
 727 reap_next_child:
 728         pid = para_reap_child();
 729         if (pid <= 0)
 730                 return;
 731         if (pid == cmd_pid) {
 732                 cmd_pid = 0;
 733                 cmd_died = 1;
 734         }
 735         goto reap_next_child;
 736 }
 737
 738 /*
 739  * print status line if line starts with known command.
 740  */
 741 static int check_stat_line(char *line, __a_unused void *data)
 742 {
 743         int i;
 744
 745 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 746         i = stat_line_valid(line);
 747         if (i >= 0) {
 748                 line += strlen(status_item_list[i]) + 1;
 749                 free(stat_content[i]);
 750                 stat_content[i] = para_strdup(line);
 751                 print_stat_item(i);
 752         }
 753         return 1;
 754 }
 755
 756 /*
 757  * This sucker modifies its first argument. *handler and *arg are
 758  * pointers to 0-terminated strings (inside line). Crap.
 759  */
 760 static int split_key_map(char *line, char **handler, char **arg)
 761 {
 762         if (!(*handler = strchr(line + 1, ':')))
 763                 goto err_out;
 764         **handler = '\0';
 765         (*handler)++;
 766         if (!(*arg = strchr(*handler, ':')))
 767                 goto err_out;
 768         **arg = '\0';
 769         (*arg)++;
 770         return 1;
 771 err_out:
 772         return 0;
 773 }
 774
 775 static int check_key_map_args(void)
 776 {
 777         char *s;
 778         int i, ret = -1;
 779         char *tmp = NULL, *handler, *arg;
 780
 781         for (i = 0; i < conf.key_map_given; ++i) {
 782                 s = conf.key_map_arg[i];
 783                 if (!(*s))
 784                         goto err_out;
 785                 free(tmp);
 786                 tmp = para_strdup(s);
 787                 if (!split_key_map(tmp, &handler, &arg))
 788                         goto err_out;
 789                 if (strlen(handler) != 1)
 790                         goto err_out;
 791                 if (*handler != 'x'
 792                         && *handler != 'd'
 793                         && *handler != 'i'
 794                         && *handler != 'p')
 795                         goto err_out;
 796                 if (*handler != 'i')
 797                         continue;
 798                 if (find_cmd_byname(arg) < 0)
 799                         goto err_out;
 800         }
 801         ret = 0;
 802 err_out:
 803         free(tmp);
 804         return ret;
 805 }
 806
 807 /*
 808  * React to various signal-related events
 809  */
 810 static void handle_signal(int sig)
 811 {
 812         switch (sig) {
 813         case SIGTERM:
 814                 msg_n_exit(EXIT_FAILURE,
 815                         "only the good die young (caught SIGTERM))\n");
 816                 return;
 817         case SIGWINCH:
 818                 if (curses_active) {
 819                         shutdown_curses();
 820                         init_curses();
 821                         redraw_bot_win();
 822                 }
 823                 return;
 824         case SIGINT:
 825                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 826                 /* Nothing to do. SIGINT killed our child, para_client stat.
 827                  * This get noticed by do_select which resets everything
 828                  */
 829                 return;
 830         case SIGUSR1:
 831                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 832                 com_reread_conf();
 833                 return;
 834         case SIGCHLD:
 835                 check_sigchld();
 836                 return;
 837         }
 838 }
 839
 840 static int open_audiod_pipe(void)
 841 {
 842         static int init = 1;
 843
 844         if (init)
 845                 init = 0;
 846         else
 847                 sleep(1);
 848         return para_open_audiod_pipe(conf.stat_cmd_arg);
 849 }
 850
 851 /*
 852  * This is the core select loop. Besides the (internal) signal
 853  * pipe, the following other fds are checked according to the mode:
 854  *
 855  * GETCH_MODE: check stdin, return when key is pressed
 856  *
 857  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 858  * of output has been read or when other end has closed command pipe or
 859  * when any key is pressed.
 860  *
 861  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 862  * is running. During that thime curses is disabled.  Returns when
 863  * cmd_pid == 0.
 864  */
 865 static int do_select(int mode)
 866 {
 867         fd_set rfds;
 868         int ret;
 869         int max_fileno, cp_numread = 1;
 870         char command_buf[4096] = "";
 871         int cbo = 0; /* command buf offset */
 872         struct timeval tv;
 873 repeat:
 874         tv.tv_sec = conf.timeout_arg  / 1000;
 875         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 876 //      ret = refresh_status();
 877         FD_ZERO(&rfds);
 878         max_fileno = 0;
 879         /* audiod pipe */
 880         if (audiod_pipe < 0)
 881                 audiod_pipe = open_audiod_pipe();
 882         if (audiod_pipe >= 0)
 883                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 884         /* signal pipe */
 885         para_fd_set(signal_pipe, &rfds, &max_fileno);
 886         /* command pipe only for COMMAND_MODE */
 887         if (command_pipe >= 0 && mode == COMMAND_MODE)
 888                 para_fd_set(command_pipe, &rfds, &max_fileno);
 889         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 890         if (ret <= 0)
 891                 goto check_return; /* skip fd checks */
 892         /* signals */
 893         if (FD_ISSET(signal_pipe, &rfds)) {
 894                 int sig_nr = para_next_signal();
 895                 if (sig_nr > 0)
 896                         handle_signal(sig_nr);
 897         }
 898         /* read command pipe if ready */
 899         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 900                         FD_ISSET(command_pipe, &rfds)) {
 901                 cp_numread = read(command_pipe, command_buf + cbo,
 902                         sizeof(command_buf) - 1 - cbo);
 903                 if (cp_numread >= 0)
 904                         cbo += cp_numread;
 905                 else {
 906                         if (cp_numread < 0)
 907                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 908                         close(command_pipe);
 909                         command_pipe = -1;
 910                 }
 911         }
 912         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 913                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 914                         close(audiod_pipe);
 915                         audiod_pipe = -1;
 916                         clear_all_items();
 917                         free(stat_content[SI_STATUS_BAR]);
 918                         stat_content[SI_STATUS_BAR] =
 919                                 para_strdup("audiod not running!?");
 920                         print_all_items();
 921                 }
 922 check_return:
 923         switch (mode) {
 924         case COMMAND_MODE:
 925                 if (cp_numread <= 0 && !cbo) /* command complete */
 926                         return 0;
 927                 if (cbo)
 928                         cbo = for_each_line(command_buf, cbo,
 929                                 &add_output_line, NULL);
 930                 if (cp_numread <= 0)
 931                         cbo = 0;
 932                 wrefresh(bot.win);
 933                 ret = wgetch(top.win);
 934                 if (ret != ERR && ret != KEY_RESIZE) {
 935                         if (command_pipe) {
 936                                 close(command_pipe);
 937                                 command_pipe = -1;
 938                         }
 939                         if (cmd_pid)
 940                                 kill(cmd_pid, SIGTERM);
 941                         return -1;
 942                 }
 943                 break;
 944         case GETCH_MODE:
 945                 ret = wgetch(top.win);
 946                 if (ret != ERR && ret != KEY_RESIZE)
 947                         return ret;
 948                 break;
 949         case EXTERNAL_MODE:
 950                 if (cmd_died) {
 951                         cmd_died = 0;
 952                         return 0;
 953                 }
 954         }
 955         goto repeat;
 956 }
 957
 958 /*
 959  * read from command pipe and print data to bot window
 960  */
 961 static int send_output(void)
 962 {
 963         if (command_pipe < 0)
 964                 return 0;
 965         if (do_select(COMMAND_MODE) >= 0)
 966                 PARA_INFO_LOG("%s", "command complete");
 967         else
 968                 PARA_NOTICE_LOG("%s", "command aborted");
 969         print_in_bar(COLOR_MSG, " ");
 970         return 1;
 971 }
 972
 973 static int client_cmd_cmdline(char *cmd)
 974 {
 975         int ret, fds[3] = {0, 1, 0};
 976         char *c = make_message(BINDIR "/para_client %s", cmd);
 977
 978         outputf(COLOR_COMMAND, "%s", c);
 979         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
 980         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
 981         free(c);
 982         if (ret < 0)
 983                 return -1;
 984         command_pipe = fds[1];
 985         mark_fd_nonblock(command_pipe);
 986         return send_output();
 987 }
 988
 989 /*
 990  * exec command and print output to bot win
 991  */
 992 static int display_cmd(char *cmd)
 993 {
 994         int fds[3] = {0, 1, 0};
 995
 996         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
 997         outputf(COLOR_COMMAND, "%s", cmd);
 998         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
 999                 return -1;
1000         command_pipe = fds[1];
1001         mark_fd_nonblock(command_pipe);
1002         return send_output();
1003 }
1004
1005 /*
1006  * shutdown curses and stat pipe before executing external commands
1007  */
1008 static int external_cmd(char *cmd)
1009 {
1010         int fds[3] = {-1, -1, -1};
1011
1012         if (cmd_pid)
1013                 return -1;
1014         shutdown_curses();
1015         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1016         cmd_died = 0;
1017         do_select(EXTERNAL_MODE);
1018         init_curses();
1019         return 0;
1020 }
1021
1022 static void print_scroll_msg(void)
1023 {
1024         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1025         int first_rbe = first_visible_rbe(&lines_total);
1026         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1027                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1028 }
1029
1030 static void com_page_down(void)
1031 {
1032         unsigned lines = 0;
1033         int i = scroll_position;
1034         while (lines < bot.lines && --i > 0) {
1035                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1036                 if (!rbe)
1037                         break;
1038                 lines += NUM_LINES(strlen(rbe->msg));
1039         }
1040         if (lines) {
1041                 scroll_position = i;
1042                 redraw_bot_win();
1043                 print_scroll_msg();
1044                 return;
1045         }
1046         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1047 }
1048
1049 static void com_page_up(void)
1050 {
1051         unsigned lines;
1052         int fvr = first_visible_rbe(&lines);
1053         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1054                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1055                 return;
1056         }
1057         scroll_position = fvr + 1;
1058         for (; scroll_position > 0; scroll_position--) {
1059                 fvr = first_visible_rbe(&lines);
1060                 if (lines == bot.lines)
1061                         break;
1062         }
1063         redraw_bot_win();
1064         print_scroll_msg();
1065 }
1066
1067 static void com_scroll_down(void)
1068 {
1069         struct rb_entry *rbe;
1070         int rbe_lines;
1071
1072         if (!scroll_position) {
1073                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1074                 return;
1075         }
1076         scroll_position--;
1077         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1078         rbe_lines = NUM_LINES(rbe->len);
1079         wscrl(bot.win, rbe_lines);
1080         wmove(bot.win, bot.lines - rbe_lines, 0);
1081         wattron(bot.win, COLOR_PAIR(rbe->color));
1082         waddstr(bot.win, rbe->msg);
1083         wrefresh(bot.win);
1084         print_scroll_msg();
1085 }
1086
1087 static void com_scroll_up(void)
1088 {
1089         struct rb_entry *rbe = NULL;
1090         unsigned lines;
1091         int i, first_rbe, num_scroll;
1092
1093         /* the entry that is going to vanish */
1094         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1095         if (!rbe)
1096                 goto err_out;
1097         num_scroll = NUM_LINES(rbe->len);
1098         first_rbe = first_visible_rbe(&lines);
1099         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1100                 goto err_out;
1101         scroll_position++;
1102         wscrl(bot.win, -num_scroll);
1103         i = draw_top_rbe(&lines);
1104         if (i < 0)
1105                 goto err_out;
1106         while (i > 0 && lines < num_scroll) {
1107                 int rbe_lines;
1108                 rbe = ringbuffer_get(bot_win_rb, --i);
1109                 if (!rbe)
1110                         break;
1111                 rbe_lines = NUM_LINES(rbe->len);
1112                 lines += rbe_lines;
1113 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1114                 wattron(bot.win, COLOR_PAIR(rbe->color));
1115                 waddstr(bot.win, "\n");
1116                 waddstr(bot.win, rbe->msg);
1117                 if (!i)
1118                         break;
1119                 i--;
1120         }
1121         wrefresh(bot.win);
1122         print_scroll_msg();
1123         return;
1124 err_out:
1125         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1126 }
1127
1128 static void com_ll_decr(void)
1129 {
1130         if (conf.loglevel_arg <= DEBUG) {
1131                 print_in_bar(COLOR_ERRMSG,
1132                         "loglevel already at maximal verbosity\n");
1133                 return;
1134         }
1135         conf.loglevel_arg--;
1136         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1137 }
1138
1139 static void com_ll_incr(void)
1140 {
1141         if (conf.loglevel_arg >= EMERG) {
1142                 print_in_bar(COLOR_ERRMSG,
1143                         "loglevel already at miminal verbosity\n");
1144                 return;
1145         }
1146         conf.loglevel_arg++;
1147         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1148 }
1149
1150 /*
1151  * reread configuration, terminate on errors
1152  */
1153 static void com_reread_conf(void)
1154 {
1155         char *cf =configfile_exists();
1156         struct gui_cmdline_parser_params params = {
1157                 .override = 1,
1158                 .initialize = 1,
1159                 .check_required = 0,
1160                 .check_ambiguity = 0
1161         };
1162
1163         if (!cf) {
1164                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1165                 return;
1166         }
1167         PARA_INFO_LOG("%s", "rereading command line options and config file");
1168         gui_cmdline_parser(_argc, _argv, &conf);
1169         gui_cmdline_parser_config_file(cf, &conf, &params);
1170         PARA_NOTICE_LOG("%s", "config file reloaded");
1171         if (check_key_map_args() < 0)
1172                 finish(EXIT_FAILURE);
1173 }
1174
1175 static void com_help(void)
1176 {
1177         int i;
1178
1179         for (i = 0; i < conf.key_map_given; ++i) {
1180                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1181                 const char *handler_text = "???", *desc = NULL;
1182
1183                 if (!split_key_map(tmp, &handler, &arg)) {
1184                         free(tmp);
1185                         return;
1186                 }
1187                 switch (*handler) {
1188                         case 'i':
1189                                 handler_text = "internal";
1190                                 desc = command_list[find_cmd_byname(arg)].description;
1191                                 break;
1192                         case 'x': handler_text = "external"; break;
1193                         case 'd': handler_text = "display "; break;
1194                         case 'p': handler_text = "para    "; break;
1195                 }
1196                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1197                         strlen(arg) < 8? "\t" : "",
1198                         desc? desc : "");
1199                 free(tmp);
1200         }
1201         for (i = 0; command_list[i].handler; i++) {
1202                 struct gui_command gc = command_list[i];
1203
1204                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1205                         strlen(gc.name) < 8? "\t" : "",
1206                         gc.description);
1207         }
1208         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1209                 "for more info");
1210 }
1211
1212 static void com_shrink_top_win(void)
1213 {
1214         if (top.lines <= theme.top_lines_min) {
1215                 PARA_WARNING_LOG("%s", "can not decrease top window");
1216                 return;
1217         }
1218         init_wins(top.lines - 1);
1219         wclear(top.win);
1220         print_all_items();
1221         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1222 }
1223
1224 static void com_enlarge_top_win(void)
1225 {
1226         if (bot.lines < 3) {
1227                 PARA_WARNING_LOG("%s", "can not increase top window");
1228                 return;
1229         }
1230         init_wins(top.lines + 1);
1231         wclear(top.win);
1232         print_all_items();
1233         print_in_bar(COLOR_MSG, "increased top window");
1234 }
1235
1236 static void com_version(void)
1237 {
1238         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1239                 CODENAME "\"");
1240 }
1241
1242 static void com_quit(void)
1243 {
1244         finish(0);
1245 }
1246
1247 static void com_refresh(void)
1248 {
1249         shutdown_curses();
1250         init_curses();
1251 }
1252
1253 static void change_theme(int next)
1254 {
1255         if (next)
1256                 next_theme(&theme);
1257         else
1258                 prev_theme(&theme);
1259         /* This seems to be needed twice, why? */
1260         com_refresh();
1261         com_refresh();
1262         PARA_NOTICE_LOG("new theme: %s", theme.name);
1263 }
1264
1265 static void com_next_theme(void)
1266 {
1267         change_theme(1);
1268 }
1269
1270 static void com_prev_theme(void)
1271 {
1272         change_theme(0);
1273 }
1274
1275
1276 static void handle_command(int c)
1277 {
1278         int i;
1279
1280         /* first check user's key bindings */
1281         for (i = 0; i < conf.key_map_given; ++i) {
1282                 char tmp[MAXLINE], *handler, *arg;
1283
1284                 strcpy(tmp, conf.key_map_arg[i]);
1285                 if (!split_key_map(tmp, &handler, &arg))
1286                         return;
1287                 if (!strcmp(tmp, km_keyname(c))) {
1288                         if (*handler == 'd') {
1289                                 display_cmd(arg);
1290                                 return;
1291                         }
1292                         if (*handler == 'x') {
1293                                 external_cmd(arg);
1294                                 return;
1295                         }
1296                         if (*handler == 'p') {
1297                                 client_cmd_cmdline(arg);
1298                                 return;
1299                         }
1300                         if (*handler == 'i') {
1301                                 int num = find_cmd_byname(arg);
1302                                 if (num >= 0)
1303                                         command_list[num].handler();
1304                                 return;
1305                         }
1306                 }
1307         }
1308         /* not found, check internal key bindings */
1309         for (i = 0; command_list[i].handler; i++) {
1310                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1311                         command_list[i].handler();
1312                         return;
1313                 }
1314         }
1315         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1316                 km_keyname(c));
1317 }
1318
1319 int main(int argc, char *argv[])
1320 {
1321         int ret;
1322         char *cf;
1323
1324         _argc = argc;
1325         _argv = argv;
1326
1327         if (gui_cmdline_parser(argc, argv, &conf)) {
1328                 fprintf(stderr, "parse error while reading command line\n");
1329                 exit(EXIT_FAILURE);
1330         }
1331         HANDLE_VERSION_FLAG("gui", conf);
1332         init_theme(0, &theme);
1333         top.lines = theme.top_lines_default;
1334         if (check_key_map_args() < 0) {
1335                 fprintf(stderr, "invalid key map\n");
1336                 exit(EXIT_FAILURE);
1337         }
1338         cf = configfile_exists();
1339         if (!cf && conf.config_file_given) {
1340                 fprintf(stderr, "can not read config file %s\n",
1341                         conf.config_file_arg);
1342                 exit(EXIT_FAILURE);
1343         }
1344         if (cf) {
1345                 struct gui_cmdline_parser_params params = {
1346                         .override = 0,
1347                         .initialize = 0,
1348                         .check_required = 0,
1349                         .check_ambiguity = 0
1350                 };
1351                 gui_cmdline_parser_config_file(cf, &conf, &params);
1352         }
1353         if (check_key_map_args() < 0) {
1354                 fprintf(stderr, "invalid key map in config file\n");
1355                 exit(EXIT_FAILURE);
1356         }
1357         setup_signal_handling();
1358         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1359         initscr(); /* needed only once, always successful */
1360         init_curses();
1361         print_welcome();
1362         for (;;) {
1363                 print_status_bar();
1364                 ret = do_select(GETCH_MODE);
1365                 if (!ret)
1366                         continue;
1367                 print_in_bar(COLOR_MSG, " ");
1368                 handle_command(ret);
1369         }
1370 }