gui.c

   1 /*
   2  * Copyright (C) 1998-2006 Andre Noll <maan@systemlinux.org>
   3  *
   4  *     This program is free software; you can redistribute it and/or modify
   5  *     it under the terms of the GNU General Public License as published by
   6  *     the Free Software Foundation; either version 2 of the License, or
   7  *     (at your option) any later version.
   8  *
   9  *     This program is distributed in the hope that it will be useful,
  10  *     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  *     GNU General Public License for more details.
  13  *
  14  *     You should have received a copy of the GNU General Public License
  15  *     along with this program; if not, write to the Free Software
  16  *     Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  17  */
  18
  19 /** \file gui.c ncurses-based interface for paraslash */
  20
  21 #include "gui.cmdline.h"
  22 #include "para.h"
  23 #include "gcc-compat.h"
  24 #include <curses.h>
  25 #include "ringbuffer.h"
  26 #include "string.h"
  27
  28 extern const char *status_item_list[NUM_STAT_ITEMS];
  29 static char *stat_content[NUM_STAT_ITEMS];
  30
  31 #define STANDARD_STATUS_BAR "para_gui " VERSION " (hit ? for help)"
  32
  33 static int signal_pipe;
  34
  35 static void finish(int sig);
  36
  37 static struct win_data {
  38         WINDOW *win;
  39         NCURSES_SIZE_T begx;
  40         NCURSES_SIZE_T begy;
  41         NCURSES_SIZE_T cols;
  42         NCURSES_SIZE_T lines;
  43 } top, bot, sb, in, sep;
  44
  45 #define RINGBUFFER_SIZE 512
  46 struct rb_entry {
  47         char *msg;
  48         size_t len;
  49         int color;
  50 };
  51 void *bot_win_rb;
  52 #define NUM_LINES(len) (1 + (len) / bot.cols)
  53
  54 static unsigned scroll_position;
  55
  56 static int external_cmd_died, curses_active;
  57 static pid_t external_cmd_pid;
  58
  59 static int command_pipe = -1;
  60 static int audiod_pipe = -1;
  61 static struct gengetopt_args_info conf;
  62
  63 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  64
  65
  66 #define COLOR_STATUSBAR 32
  67 #define COLOR_COMMAND 33
  68 #define COLOR_OUTPUT 34
  69 #define COLOR_MSG 35
  70 #define COLOR_ERRMSG 36
  71 #define COLOR_WELCOME 37
  72 #define COLOR_SEPARATOR 38
  73 #define COLOR_TOP 39
  74 #define COLOR_BOT 40
  75
  76 struct gui_command {
  77         char *key;
  78         char *name;
  79         char *description;
  80         void (*handler)(void);
  81 };
  82
  83 struct stat_item {
  84         char name[MAXLINE];
  85         char prefix[MAXLINE];
  86         char postfix[MAXLINE];
  87         unsigned y;
  88         unsigned x;
  89         unsigned len;
  90         int fg, bg;
  91         int align;
  92         char content[MAXLINE];
  93 };
  94
  95 static struct gui_theme theme;
  96
  97 int _argc;
  98 char **_argv;
  99
 100 static void com_help(void);
 101 static void com_reread_conf(void);
 102 static void com_enlarge_top_win(void);
 103 static void com_shrink_top_win(void);
 104 static void com_version(void);
 105 static void com_quit(void);
 106 static void com_refresh(void);
 107 static void com_ll_incr(void);
 108 static void com_ll_decr(void);
 109 static void com_prev_theme(void);
 110 static void com_next_theme(void);
 111 static void com_scroll_up(void);
 112 static void com_scroll_down(void);
 113 static void com_page_up(void);
 114 static void com_page_down(void);
 115
 116 struct gui_command command_list[] = {
 117         {
 118                 .key = "?",
 119                 .name = "help",
 120                 .description = "print help",
 121                 .handler = com_help
 122         }, {
 123                 .key = "+",
 124                 .name = "enlarge_win",
 125                 .description = "enlarge the top window",
 126                 .handler = com_enlarge_top_win
 127         }, {
 128                 .key = "-",
 129                 .name = "shrink_win",
 130                 .description = "shrink the top window",
 131                 .handler = com_shrink_top_win
 132         }, {
 133                 .key = "r",
 134                 .name = "reread_conf",
 135                 .description = "reread configuration file",
 136                 .handler = com_reread_conf
 137         }, {
 138                 .key = "q",
 139                 .name = "quit",
 140                 .description = "exit para_gui",
 141                 .handler = com_quit
 142         }, {
 143                 .key = "^L",
 144                 .name = "refresh",
 145                 .description = "redraw the screen",
 146                 .handler = com_refresh
 147         }, {
 148                 .key = ".",
 149                 .name = "next_theme",
 150                 .description = "switch to next theme",
 151                 .handler = com_next_theme
 152         }, {
 153                 .key = ",",
 154                 .name = "prev_theme",
 155                 .description = "switch to previous stream",
 156                 .handler = com_prev_theme
 157         }, {
 158                 .key = ">",
 159                 .name = "ll_incr",
 160                 .description = "increase loglevel (decreases verbosity)",
 161                 .handler = com_ll_incr
 162         }, {
 163                 .key = "<",
 164                 .name = "ll_decr",
 165                 .description = "decrease loglevel (increases verbosity)",
 166                 .handler = com_ll_decr
 167         }, {
 168                 .key = "V",
 169                 .name = "version",
 170                 .description = "show the para_gui version",
 171                 .handler = com_version
 172         }, {
 173                 .key = "<up>",
 174                 .name = "scroll_up",
 175                 .description = "scroll up one line",
 176                 .handler = com_scroll_up
 177         }, {
 178                 .key = "<down>",
 179                 .name = "scroll_down",
 180                 .description = "scroll down one line",
 181                 .handler = com_scroll_down
 182         }, {
 183                 .key = "<ppage>",
 184                 .name = "page_up",
 185                 .description = "scroll up one page",
 186                 .handler = com_page_up
 187         }, {
 188                 .key = "<npage>",
 189                 .name = "page_down",
 190                 .description = "scroll down one page",
 191                 .handler = com_page_down
 192         }, {
 193                 .handler = NULL
 194         }
 195 };
 196
 197 static int find_cmd_byname(char *name)
 198 {
 199         int i;
 200
 201         for (i = 0; command_list[i].handler; i++)
 202                 if (!strcmp(command_list[i].name, name))
 203                         return i;
 204         return -1;
 205 }
 206
 207 /* taken from mutt */
 208 static char *km_keyname(int c)
 209 {
 210         static char buf[10];
 211
 212         if (c == KEY_UP) {
 213                 sprintf(buf, "<up>");
 214                 return buf;
 215         }
 216         if (c == KEY_DOWN) {
 217                 sprintf(buf, "<down>");
 218                 return buf;
 219         }
 220         if (c == KEY_LEFT) {
 221                 sprintf(buf, "<left>");
 222                 return buf;
 223         }
 224         if (c == KEY_RIGHT) {
 225                 sprintf(buf, "<right>");
 226                 return buf;
 227         }
 228         if (c == KEY_NPAGE) {
 229                 sprintf(buf, "<npage>");
 230                 return buf;
 231         }
 232         if (c == KEY_PPAGE) {
 233                 sprintf(buf, "<ppage>");
 234                 return buf;
 235         }
 236         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 237                 if (c < 0)
 238                         c += 256;
 239                 if (c < 128) {
 240                         buf[0] = '^';
 241                         buf[1] = (c + '@') & 0x7f;
 242                         buf[2] = 0;
 243                 } else
 244                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 245                                 (c >> 3) & 7, c & 7);
 246         } else if (c >= KEY_F0 && c < KEY_F(256))
 247                 sprintf(buf, "<F%d>", c - KEY_F0);
 248         else if (isprint(c))
 249                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 250         else
 251                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 252         return buf;
 253 }
 254
 255 static char *configfile_exists(void)
 256 {
 257         static char *config_file;
 258         char *tmp;
 259
 260         if (!conf.config_file_given) {
 261                 if (!config_file) {
 262                         char *home = para_homedir();
 263                         config_file = make_message("%s/.paraslash/gui.conf",
 264                                 home);
 265                         free(home);
 266                 }
 267                 tmp = config_file;
 268         } else
 269                 tmp = conf.config_file_arg;
 270         return file_exists(tmp)? tmp: NULL;
 271 }
 272
 273 /*
 274  * print num spaces to curses window
 275  */
 276 static void add_spaces(WINDOW* win, unsigned int num)
 277 {
 278         while (num > 0) {
 279                 num--;
 280                 waddstr(win, " ");
 281         }
 282 }
 283
 284 /*
 285  * print aligned string to curses window. This function always prints
 286  * exactly len chars.
 287  */
 288 static int align_str(WINDOW* win, char *string, unsigned int len,
 289                 unsigned int align)
 290 {
 291         int num; /* of spaces */
 292         char *str;
 293
 294         if (!win || !string)
 295                 return -1;
 296         num = len - strlen(string);
 297         str = para_strdup(string);
 298         if (num < 0) {
 299                 str[len] = '\0';
 300                 num = 0;
 301         }
 302         if (align == LEFT) {
 303                 waddstr(win, str);
 304                 add_spaces(win, num);
 305         } else if (align == RIGHT) {
 306                 add_spaces(win, num);
 307                 waddstr(win, str);
 308         } else {
 309                 add_spaces(win, num / 2);
 310                 waddstr(win, str[0]? str: "");
 311                 add_spaces(win, num - num / 2);
 312         }
 313         free(str);
 314         return 1;
 315 }
 316
 317 __printf_2_3 static void print_in_bar(int color, char *fmt,...)
 318 {
 319         char *msg;
 320
 321         if (!curses_active)
 322                 return;
 323         wattron(in.win, COLOR_PAIR(color));
 324         PARA_VSPRINTF(fmt, msg);
 325         wmove(in.win, 0, 0);
 326         align_str(in.win, msg, sb.cols, LEFT);
 327         free(msg);
 328         wrefresh(in.win);
 329 }
 330
 331 /*
 332  * update the status bar
 333  */
 334 static void print_status_bar(void)
 335 {
 336         if (!curses_active)
 337                 return;
 338         wmove(sb.win, 0, 0);
 339         align_str(sb.win,STANDARD_STATUS_BAR, sb.cols, CENTER);
 340         wrefresh(sb.win);
 341 }
 342
 343 /*
 344  * get the number of the oldest rbe that is (partially) visible. On return,
 345  * lines contains the sum of the number of lines of all visable entries. If the
 346  * first one is only partially visible, lines is greater than bot.lines.
 347  */
 348 static int first_visible_rbe(unsigned *lines)
 349 {
 350         int i;
 351         *lines = 0;
 352         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 353                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 354                 int rbe_lines;
 355                 if (!rbe)
 356                         return i - 1;
 357 //              fprintf(stderr, "found: %s\n", rbe->msg);
 358                 rbe_lines = NUM_LINES(rbe->len);
 359                 if (rbe_lines > bot.lines)
 360                         return -1;
 361                 *lines += rbe_lines;
 362                 if (*lines >= bot.lines)
 363                         return i;
 364         }
 365         return RINGBUFFER_SIZE - 1;
 366 }
 367
 368 static int draw_top_rbe(unsigned *lines)
 369 {
 370         unsigned len;
 371         int offset, fvr = first_visible_rbe(lines);
 372         struct rb_entry *rbe;
 373
 374         if (fvr < 0)
 375                 return -1;
 376         wmove(bot.win, 0, 0);
 377         rbe = ringbuffer_get(bot_win_rb, fvr);
 378         if (!rbe)
 379                 return -1;
 380         /* first rbe might be only partially visible */
 381         offset = (*lines - bot.lines) * bot.cols;
 382         len = strlen(rbe->msg);
 383         if (offset < 0 || len < offset)
 384                 return -1;
 385         wattron(bot.win, COLOR_PAIR(rbe->color));
 386         waddstr(bot.win, rbe->msg + offset);
 387         *lines = NUM_LINES(len - offset);
 388         return fvr;
 389 }
 390
 391 static void redraw_bot_win(void)
 392 {
 393         unsigned lines;
 394         int i;
 395
 396         wmove(bot.win, 0, 0);
 397         wclear(bot.win);
 398         i = draw_top_rbe(&lines);
 399         if (i <= 0)
 400                 goto out;
 401         while (i > 0 && lines < bot.lines) {
 402                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 403                 if (!rbe) {
 404                         lines++;
 405                         waddstr(bot.win, "\n");
 406                         continue;
 407                 }
 408                 lines += NUM_LINES(rbe->len);
 409                 wattron(bot.win, COLOR_PAIR(rbe->color));
 410                 waddstr(bot.win, "\n");
 411                 waddstr(bot.win, rbe->msg);
 412         }
 413 out:
 414         wrefresh(bot.win);
 415 }
 416
 417 static void rb_add_entry(int color, char *msg)
 418 {
 419         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 420         int x, y;
 421         new->color = color;
 422         new->len = strlen(msg);
 423         new->msg = msg;
 424         old = ringbuffer_add(bot_win_rb, new);
 425 //      fprintf(stderr, "added: %s\n", new->msg);
 426         if (old) {
 427                 free(old->msg);
 428                 free(old);
 429         }
 430         if (scroll_position) {
 431                 /* discard current scrolling, like xterm does */
 432                 scroll_position = 0;
 433                 redraw_bot_win();
 434                 return;
 435         }
 436         wattron(bot.win, COLOR_PAIR(color));
 437         getyx(bot.win, y, x);
 438         if (y || x)
 439                 waddstr(bot.win, "\n");
 440         waddstr(bot.win, msg);
 441 }
 442
 443 /*
 444  * print formated output to bot win and refresh
 445  */
 446 __printf_2_3 static void outputf(int color, char* fmt,...)
 447 {
 448         char *msg;
 449
 450         if (!curses_active)
 451                 return;
 452         PARA_VSPRINTF(fmt, msg);
 453         rb_add_entry(color, msg);
 454         wrefresh(bot.win);
 455 }
 456
 457 static void add_output_line(char *line)
 458 {
 459         if (!curses_active)
 460                 return;
 461         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 462 }
 463
 464 void para_log(int ll, char *fmt,...)
 465 {
 466         int color;
 467         char *msg;
 468
 469         if (ll < conf.loglevel_arg || !curses_active)
 470                 return;
 471         switch (ll) {
 472                 case DEBUG:
 473                 case INFO:
 474                 case NOTICE:
 475                         color = COLOR_MSG;
 476                         break;
 477                 default:
 478                         color = COLOR_ERRMSG;
 479         }
 480         PARA_VSPRINTF(fmt, msg);
 481         chop(msg);
 482         rb_add_entry(color, msg);
 483         wrefresh(bot.win);
 484 }
 485
 486 static void setup_signal_handling(void)
 487 {
 488         signal_pipe = para_signal_init();
 489         para_install_sighandler(SIGINT);
 490         para_install_sighandler(SIGTERM);
 491         para_install_sighandler(SIGCHLD);
 492         para_install_sighandler(SIGWINCH);
 493         para_install_sighandler(SIGUSR1);
 494         signal(SIGPIPE, SIG_IGN);
 495         signal(SIGHUP, SIG_IGN);
 496 }
 497
 498 static void do_exit(int ret)
 499 {
 500         signal(SIGTERM, SIG_IGN);
 501         kill(0, SIGTERM);
 502         exit(ret);
 503 }
 504
 505 static void shutdown_curses(void)
 506 {
 507         if (!curses_active)
 508                 return;
 509         def_prog_mode();
 510         curses_active = 0;
 511         endwin();
 512 }
 513
 514 static void finish(int ret)
 515 {
 516         shutdown_curses();
 517         do_exit(ret);
 518 }
 519
 520 /*
 521  * exit curses and print given message to stdout/stderr
 522  */
 523 __printf_2_3 static void msg_n_exit(int ret, char* fmt, ...)
 524 {
 525         va_list argp;
 526         FILE *outfd = ret? stderr: stdout;
 527
 528         shutdown_curses();
 529         va_start(argp, fmt);
 530         vfprintf(outfd, fmt, argp);
 531         va_end(argp);
 532         do_exit(ret);
 533 }
 534
 535 static void print_welcome(void)
 536 {
 537         int ll = conf.loglevel_arg;
 538         if (ll > NOTICE)
 539                 return;
 540         outputf(COLOR_WELCOME, "Welcome to para_gui " VERSION
 541                 " \"" CODENAME "\". Theme: %s", theme.name);
 542         wclrtoeol(bot.win);
 543 }
 544
 545 /*
 546  * init all windows
 547  */
 548 static void init_wins(int top_lines)
 549 {
 550         int i;
 551
 552         top.lines = top_lines;
 553         top.cols = COLS;
 554         top.begy = 0;
 555         top.begx = 0;
 556
 557         bot.lines = LINES - top.lines - 3;
 558         bot.cols = COLS;
 559         bot.begy = top.lines + 1;
 560         bot.begx = 0;
 561
 562         sb.lines = 1;
 563         sb.cols = COLS;
 564         sb.begy = LINES - 2;
 565         sb.begx = 0;
 566
 567         in.lines = 1;
 568         in.cols = COLS;
 569         in.begy = LINES - 1;
 570         in.begx = 0;
 571
 572         sep.lines = 1;
 573         sep.cols = COLS;
 574         sep.begy = top.lines;
 575         sep.begx = 0;
 576
 577         assume_default_colors(theme.default_fg, theme.default_bg);
 578         if (top.win) {
 579                 mvwin(top.win, top.begy, top.begx);
 580                 wresize(top.win, top.lines, top.cols);
 581
 582                 mvwin(sb.win, sb.begy, sb.begx);
 583                 wresize(sb.win, sb.lines, sb.cols);
 584
 585                 mvwin(sep.win, sep.begy, sep.begx);
 586                 wresize(sep.win, sep.lines, sep.cols);
 587
 588                 mvwin(bot.win, bot.begy, bot.begx);
 589                 wresize(bot.win, bot.lines, bot.cols);
 590
 591                 mvwin(in.win, in.begy, in.begx);
 592                 wresize(in.win, in.lines, in.cols);
 593         } else {
 594                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 595                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 596                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 597                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 598                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 599                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 600                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 601                 wclear(bot.win);
 602                 wclear(sb.win);
 603                 wclear(in.win);
 604                 scrollok(bot.win, 1);
 605                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 606                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 607                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 608                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 609                 nodelay(top.win, 1);
 610                 nodelay(bot.win, 1);
 611                 nodelay(sb.win, 1);
 612                 nodelay(in.win, 0);
 613
 614                 keypad(top.win, 1);
 615                 keypad(bot.win, 1);
 616                 keypad(sb.win, 1);
 617                 keypad(in.win, 1);
 618                 print_status_bar();
 619         }
 620         wmove(sep.win, 0, 0);
 621         for (i = 1; i <= COLS; i++)
 622                 waddstr(sep.win, theme.sep_str);
 623         wclear(top.win);
 624         //wclear(bot.win);
 625         wnoutrefresh(top.win);
 626         wnoutrefresh(bot.win);
 627         //wnoutrefresh(sb.win);
 628         print_status_bar();
 629         wnoutrefresh(in.win);
 630         wnoutrefresh(sep.win);
 631         doupdate();
 632 }
 633
 634 static void check_geometry(void)
 635 {
 636         if (LINES < theme.lines_min || COLS < theme.cols_min)
 637                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 638                         " (need at least %dx%d)\n", COLS, LINES,
 639                         theme.cols_min, theme.lines_min);
 640 }
 641
 642 /*
 643  * Print stat item #i to curses window
 644  */
 645 static void print_stat_item(int i)
 646 {
 647         char *tmp;
 648         struct stat_item_data d = theme.data[i];
 649         char *c = stat_content[i];
 650
 651         if (!curses_active || !d.len || !c)
 652                 return;
 653         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 654 //      PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
 655         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 656         wrefresh(top.win);
 657         wattron(top.win, COLOR_PAIR(i + 1));
 658         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 659         free(tmp);
 660         wrefresh(top.win);
 661 }
 662
 663 static void print_all_items(void)
 664 {
 665         int i;
 666
 667         if (!curses_active)
 668                 return;
 669         for (i = 0; i < NUM_STAT_ITEMS; i++)
 670                 print_stat_item(i);
 671 }
 672 static void clear_all_items(void)
 673 {
 674         int i;
 675
 676         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 677                 free(stat_content[i]);
 678                 stat_content[i] = para_strdup("");
 679         }
 680 }
 681
 682 static void init_colors(void)
 683 {
 684         int i;
 685         if (!has_colors())
 686                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 687         start_color();
 688         for (i = 0; i < NUM_STAT_ITEMS; i++)
 689                 if (theme.data[i].len)
 690                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 691         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 692         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 693         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 694         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 695         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 696         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 697         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 698         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 699         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 700 }
 701
 702 /*
 703  * (re-)initialize the curses library  FIXME: Error checking
 704  */
 705 static void init_curses(void)
 706 {
 707         curses_active = 1;
 708         if (top.win && refresh() == ERR) { /* refesh is really needed */
 709                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 710         }
 711         check_geometry();
 712         curs_set(0); /* make cursor invisible, ignore errors */
 713 //      if (noraw() == ERR);
 714 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 715 //                      "raw mode\n");
 716         nonl(); /* tell curses not to do NL->CR/NL on output */
 717         noecho(); /* don't echo input */
 718         cbreak(); /* take input chars one at a time, no wait for \n */
 719         //reset_prog_mode();
 720         init_colors();
 721         clear();
 722         init_wins(theme.top_lines_default);
 723         print_all_items();
 724         noecho(); /* don't echo input */
 725 }
 726
 727
 728 static void check_sigchld(void)
 729 {
 730         pid_t pid;
 731 reap_next_child:
 732         pid = para_reap_child();
 733         if (pid <= 0)
 734                 return;
 735         if (pid == external_cmd_pid) {
 736                 external_cmd_pid = 0;
 737                 external_cmd_died = 1;
 738         }
 739         goto reap_next_child;
 740 }
 741
 742 /*
 743  * print status line if line starts with known command.
 744  */
 745 static void check_stat_line(char *line)
 746 {
 747         int i;
 748
 749 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 750         i = stat_line_valid(line);
 751         if (i >= 0) {
 752                 line += strlen(status_item_list[i]) + 1;
 753                 free(stat_content[i]);
 754                 stat_content[i] = para_strdup(line);
 755                 print_stat_item(i);
 756         }
 757         return;
 758 }
 759
 760 /*
 761  * This sucker modifies its first argument. *handler and *arg are
 762  * pointers to 0-terminated strings (inside line). Crap.
 763  */
 764 static int split_key_map(char *line, char **handler, char **arg)
 765 {
 766         if (!(*handler = strchr(line + 1, ':')))
 767                 goto err_out;
 768         **handler = '\0';
 769         (*handler)++;
 770         if (!(*arg = strchr(*handler, ':')))
 771                 goto err_out;
 772         **arg = '\0';
 773         (*arg)++;
 774         return 1;
 775 err_out:
 776         return 0;
 777 }
 778
 779 static int check_key_map_args(void)
 780 {
 781         char *s;
 782         int i, ret = -1;
 783         char *tmp = NULL, *handler, *arg;
 784
 785         for (i = 0; i < conf.key_map_given; ++i) {
 786                 s = conf.key_map_arg[i];
 787                 if (!(*s))
 788                         goto err_out;
 789                 free(tmp);
 790                 tmp = para_strdup(s);
 791                 if (!split_key_map(tmp, &handler, &arg))
 792                         goto err_out;
 793                 if (strlen(handler) != 1)
 794                         goto err_out;
 795                 if (*handler != 'x'
 796                         && *handler != 'd'
 797                         && *handler != 'i'
 798                         && *handler != 'p')
 799                         goto err_out;
 800                 if (*handler != 'i')
 801                         continue;
 802                 if (find_cmd_byname(arg) < 0)
 803                         goto err_out;
 804         }
 805         ret = 0;
 806 err_out:
 807         free(tmp);
 808         return ret;
 809 }
 810
 811 /*
 812  * React to various signal-related events
 813  */
 814 static void handle_signal(int sig)
 815 {
 816         switch (sig) {
 817         case SIGTERM:
 818                 msg_n_exit(EXIT_FAILURE,
 819                         "only the good die young (caught SIGTERM))\n");
 820                 return;
 821         case SIGWINCH:
 822                 if (curses_active) {
 823                         shutdown_curses();
 824                         init_curses();
 825                         redraw_bot_win();
 826                 }
 827                 return;
 828         case SIGINT:
 829                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 830                 /* Nothing to do. SIGINT killed our child, para_client stat.
 831                  * This get noticed by do_select which resets everything
 832                  */
 833                 return;
 834         case SIGUSR1:
 835                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 836                 com_reread_conf();
 837                 return;
 838         case SIGCHLD:
 839                 check_sigchld();
 840                 return;
 841         }
 842 }
 843
 844 static int open_audiod_pipe(void)
 845 {
 846         static int init = 1;
 847
 848         if (init)
 849                 init = 0;
 850         else
 851                 sleep(1);
 852         return para_open_audiod_pipe(conf.stat_cmd_arg);
 853 }
 854
 855 /*
 856  * This is the core select loop. Besides the (internal) signal
 857  * pipe, the following other fds are checked according to the mode:
 858  *
 859  * GETCH_MODE: check stdin, return when key is pressed
 860  *
 861  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 862  * of output has been read or when other end has closed command pipe or
 863  * when any key is pressed.
 864  *
 865  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 866  * is running. During that thime curses is disabled.  Returns when
 867  * external_cmd_pid == 0.
 868  */
 869 static int do_select(int mode)
 870 {
 871         fd_set rfds;
 872         int ret;
 873         int max_fileno, cp_numread = 1;
 874         char command_buf[STRINGSIZE] = "";
 875         int cbo = 0; /* command buf offset */
 876         struct timeval tv;
 877 repeat:
 878         tv.tv_sec = conf.timeout_arg  / 1000;
 879         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 880 //      ret = refresh_status();
 881         FD_ZERO(&rfds);
 882         max_fileno = 0;
 883         /* audiod pipe */
 884         if (audiod_pipe < 0)
 885                 audiod_pipe = open_audiod_pipe();
 886         if (audiod_pipe >= 0) {
 887                 FD_SET(audiod_pipe, &rfds);
 888                 max_fileno = MAX(max_fileno, audiod_pipe);
 889         }
 890
 891         /* signal pipe */
 892         FD_SET(signal_pipe, &rfds);
 893         max_fileno = MAX(max_fileno, signal_pipe);
 894         /* command pipe only for COMMAND_MODE */
 895         if (command_pipe >= 0 && mode == COMMAND_MODE) {
 896                 FD_SET(command_pipe, &rfds);
 897                 max_fileno = MAX(max_fileno, command_pipe);
 898         }
 899         FD_SET(STDIN_FILENO, &rfds);
 900         ret = select(max_fileno + 1, &rfds, NULL, NULL, &tv);
 901 //      PARA_DEBUG_LOG("select returned %d\n", ret);
 902
 903         /* signals */
 904         if (FD_ISSET(signal_pipe, &rfds)) {
 905                 int sig_nr = para_next_signal();
 906                 if (sig_nr > 0)
 907                         handle_signal(sig_nr);
 908         }
 909         if (ret <= 0)
 910                 goto check_return; /* skip fd checks */
 911         /* read command pipe if ready */
 912         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 913                         FD_ISSET(command_pipe, &rfds)) {
 914                 cp_numread = read(command_pipe, command_buf + cbo,
 915                         STRINGSIZE - 1 - cbo);
 916                 if (cp_numread >= 0)
 917                         cbo += cp_numread;
 918                 else {
 919                         if (cp_numread < 0)
 920                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 921                         close(command_pipe);
 922                         command_pipe = -1;
 923                 }
 924         }
 925         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 926                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 927                         close(audiod_pipe);
 928                         audiod_pipe = -1;
 929                         clear_all_items();
 930                         free(stat_content[SI_STATUS_BAR]);
 931                         stat_content[SI_STATUS_BAR] =
 932                                 para_strdup("audiod not running!?");
 933                         print_all_items();
 934                 }
 935 check_return:
 936         switch (mode) {
 937         case COMMAND_MODE:
 938                 if (cp_numread <= 0 && !cbo) /* command complete */
 939                         return 0;
 940                 if (cbo)
 941                         cbo = for_each_line(command_buf, cbo, &add_output_line, 0);
 942                 if (cp_numread <= 0)
 943                         cbo = 0;
 944                 wrefresh(bot.win);
 945                 break;
 946         case GETCH_MODE:
 947                 ret = wgetch(top.win);
 948                 if (ret != ERR && ret != KEY_RESIZE)
 949                         return ret;
 950                 break;
 951         case EXTERNAL_MODE:
 952                 if (external_cmd_died) {
 953                         external_cmd_died = 0;
 954                         return 0;
 955                 }
 956         }
 957         goto repeat;
 958 }
 959
 960 /*
 961  * read from command pipe and print data to bot window
 962  */
 963 static int send_output(void)
 964 {
 965         if (command_pipe < 0)
 966                 return 0;
 967         if (do_select(COMMAND_MODE) >= 0)
 968                 PARA_INFO_LOG("%s", "command complete");
 969         else
 970                 PARA_NOTICE_LOG("%s", "command aborted");
 971         print_in_bar(COLOR_MSG, " ");
 972         return 1;
 973 }
 974
 975 static int client_cmd_cmdline(char *cmd)
 976 {
 977         pid_t pid;
 978         int ret, fds[3] = {0, 1, 0};
 979         char *c = make_message(BINDIR "/para_client %s", cmd);
 980
 981         outputf(COLOR_COMMAND, "%s", c);
 982         print_in_bar(COLOR_MSG, "executing client command, hit q to abort\n");
 983         ret = para_exec_cmdline_pid(&pid, c, fds);
 984         free(c);
 985         if (ret < 0)
 986                 return -1;
 987         command_pipe = fds[1];
 988         return send_output();
 989 }
 990
 991 /*
 992  * exec command and print output to bot win
 993  */
 994 static int display_cmd(char *cmd)
 995 {
 996         pid_t pid;
 997         int fds[3] = {0, 1, 0};
 998
 999         print_in_bar(COLOR_MSG, "executing display command, hit q to abort");
1000         outputf(COLOR_COMMAND, "%s", cmd);
1001         if (para_exec_cmdline_pid(&pid, cmd, fds) < 0)
1002                 return -1;
1003         command_pipe = fds[1];
1004         return send_output();
1005 }
1006
1007 /*
1008  * shutdown curses and stat pipe before executing external commands
1009  */
1010 static int external_cmd(char *cmd)
1011 {
1012         int fds[3] = {-1, -1, -1};
1013
1014         if (external_cmd_pid)
1015                 return -1;
1016         shutdown_curses();
1017         para_exec_cmdline_pid(&external_cmd_pid, cmd, fds);
1018         do_select(EXTERNAL_MODE);
1019         init_curses();
1020         return 0;
1021 }
1022
1023 static void print_scroll_msg(void)
1024 {
1025         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1026         int first_rbe = first_visible_rbe(&lines_total);
1027         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1028                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1029 }
1030
1031 static void com_page_down(void)
1032 {
1033         unsigned lines = 0;
1034         int i = scroll_position;
1035         while (lines < bot.lines && --i > 0) {
1036                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1037                 if (!rbe)
1038                         break;
1039                 lines += NUM_LINES(strlen(rbe->msg));
1040         }
1041         if (lines) {
1042                 scroll_position = i;
1043                 redraw_bot_win();
1044                 print_scroll_msg();
1045                 return;
1046         }
1047         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1048 }
1049
1050 static void com_page_up(void)
1051 {
1052         unsigned lines;
1053         int fvr = first_visible_rbe(&lines);
1054         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1055                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1056                 return;
1057         }
1058         scroll_position = fvr + 1;
1059         for (; scroll_position > 0; scroll_position--) {
1060                 fvr = first_visible_rbe(&lines);
1061                 if (lines == bot.lines)
1062                         break;
1063         }
1064         redraw_bot_win();
1065         print_scroll_msg();
1066 }
1067
1068 static void com_scroll_down(void)
1069 {
1070         struct rb_entry *rbe;
1071         int rbe_lines;
1072
1073         if (!scroll_position) {
1074                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1075                 return;
1076         }
1077         scroll_position--;
1078         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1079         rbe_lines = NUM_LINES(rbe->len);
1080         wscrl(bot.win, rbe_lines);
1081         wmove(bot.win, bot.lines - rbe_lines, 0);
1082         wattron(bot.win, COLOR_PAIR(rbe->color));
1083         waddstr(bot.win, rbe->msg);
1084         wrefresh(bot.win);
1085         print_scroll_msg();
1086 }
1087
1088 static void com_scroll_up(void)
1089 {
1090         struct rb_entry *rbe = NULL;
1091         unsigned lines;
1092         int i, first_rbe, scroll;
1093
1094         /* the entry that is going to vanish */
1095         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1096         if (!rbe)
1097                 goto err_out;
1098         scroll = NUM_LINES(rbe->len);
1099         first_rbe = first_visible_rbe(&lines);
1100         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1101                 goto err_out;
1102         scroll_position++;
1103         wscrl(bot.win, -scroll);
1104         i = draw_top_rbe(&lines);
1105         if (i < 0)
1106                 goto err_out;
1107         while (i > 0 && lines < scroll) {
1108                 int rbe_lines;
1109                 rbe = ringbuffer_get(bot_win_rb, --i);
1110                 if (!rbe)
1111                         break;
1112                 rbe_lines = NUM_LINES(rbe->len);
1113                 lines += rbe_lines;
1114 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1115                 wattron(bot.win, COLOR_PAIR(rbe->color));
1116                 waddstr(bot.win, "\n");
1117                 waddstr(bot.win, rbe->msg);
1118                 if (!i)
1119                         break;
1120                 i--;
1121         }
1122         wrefresh(bot.win);
1123         print_scroll_msg();
1124         return;
1125 err_out:
1126         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1127 }
1128
1129 static void com_ll_decr(void)
1130 {
1131         if (conf.loglevel_arg <= DEBUG) {
1132                 print_in_bar(COLOR_ERRMSG,
1133                         "loglevel already at maximal verbosity\n");
1134                 return;
1135         }
1136         conf.loglevel_arg--;
1137         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1138 }
1139
1140 static void com_ll_incr(void)
1141 {
1142         if (conf.loglevel_arg >= EMERG) {
1143                 print_in_bar(COLOR_ERRMSG,
1144                         "loglevel already at miminal verbosity\n");
1145                 return;
1146         }
1147         conf.loglevel_arg++;
1148         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1149 }
1150
1151 /*
1152  * reread configuration, terminate on errors
1153  */
1154 static void com_reread_conf(void)
1155 {
1156         char *cf =configfile_exists();
1157
1158         if (!cf) {
1159                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1160                 return;
1161         }
1162         PARA_INFO_LOG("%s", "rereading command line options and config file");
1163         cmdline_parser(_argc, _argv, &conf);
1164         cmdline_parser_configfile(cf, &conf, 1, 1, 0);
1165         PARA_NOTICE_LOG("%s", "configuration read");
1166         if (check_key_map_args() < 0)
1167                 finish(EXIT_FAILURE);
1168 }
1169
1170 static void com_help(void)
1171 {
1172         int i;
1173
1174         for (i = 0; i < conf.key_map_given; ++i) {
1175                 char *s = conf.key_map_arg[i], *handler, *arg,
1176                         *desc = "", tmp[MAXLINE];
1177
1178                 strcpy(tmp, s);
1179                 if (!split_key_map(tmp, &handler, &arg))
1180                         return;
1181                 switch(*handler) {
1182                         case 'i':
1183                                 handler = "internal";
1184                                 desc = command_list[find_cmd_byname(arg)].description;
1185                                 break;
1186                         case 'x': handler = "external"; break;
1187                         case 'd': handler = "display "; break;
1188                         case 'p': handler = "para    "; break;
1189                 }
1190                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler, arg,
1191                         strlen(arg) < 8? "\t" : "",
1192                         desc);
1193         }
1194         for (i = 0; command_list[i].handler; i++) {
1195                 struct gui_command gc = command_list[i];
1196
1197                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1198                         strlen(gc.name) < 8? "\t" : "",
1199                         gc.description);
1200         }
1201         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1202                 "for more info");
1203         return;
1204 }
1205
1206 static void com_shrink_top_win(void)
1207 {
1208         if (top.lines <= theme.top_lines_min) {
1209                 PARA_WARNING_LOG("%s", "can not decrease top window");
1210                 return;
1211         }
1212         init_wins(top.lines - 1);
1213         wclear(top.win);
1214         print_all_items();
1215         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1216 }
1217
1218 static void com_enlarge_top_win(void)
1219 {
1220         if (bot.lines < 3) {
1221                 PARA_WARNING_LOG("%s", "can not increase top window");
1222                 return;
1223         }
1224         init_wins(top.lines + 1);
1225         wclear(top.win);
1226         print_all_items();
1227         print_in_bar(COLOR_MSG, "increased top window");
1228 }
1229
1230 static void com_version(void)
1231 {
1232         print_in_bar(COLOR_MSG, "para_gui " VERSION " \"" CODENAME "\"");
1233 }
1234
1235 static void com_quit(void)
1236 {
1237         finish(0);
1238 }
1239
1240 static void com_refresh(void)
1241 {
1242         shutdown_curses();
1243         init_curses();
1244 }
1245
1246 static void change_theme(int next)
1247 {
1248         if (next)
1249                 next_theme(&theme);
1250         else
1251                 prev_theme(&theme);
1252         /* This seems to be needed twice, why? */
1253         com_refresh();
1254         com_refresh();
1255         PARA_NOTICE_LOG("new theme: %s", theme.name);
1256 }
1257
1258 static void com_next_theme(void)
1259 {
1260         change_theme(1);
1261 }
1262
1263 static void com_prev_theme(void)
1264 {
1265         change_theme(0);
1266 }
1267
1268
1269 static void handle_command(int c)
1270 {
1271         int i;
1272
1273         /* first check user's key bindings */
1274         for (i = 0; i < conf.key_map_given; ++i) {
1275                 char tmp[MAXLINE], *handler, *arg;
1276
1277                 strcpy(tmp, conf.key_map_arg[i]);
1278                 if (!split_key_map(tmp, &handler, &arg))
1279                         return;
1280                 if (!strcmp(tmp, km_keyname(c))) {
1281                         if (*handler == 'd') {
1282                                 display_cmd(arg);
1283                                 return;
1284                         }
1285                         if (*handler == 'x') {
1286                                 external_cmd(arg);
1287                                 return;
1288                         }
1289                         if (*handler == 'p') {
1290                                 client_cmd_cmdline(arg);
1291                                 return;
1292                         }
1293                         if (*handler == 'i') {
1294                                 int num = find_cmd_byname(arg);
1295                                 if (num >= 0)
1296                                         command_list[num].handler();
1297                                 return;
1298                         }
1299                 }
1300         }
1301         /* not found, check internal key bindings */
1302         for (i = 0; command_list[i].handler; i++) {
1303                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1304                         command_list[i].handler();
1305                         return;
1306                 }
1307         }
1308         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1309                 km_keyname(c));
1310 }
1311
1312 int main(int argc, char *argv[])
1313 {
1314         int ret;
1315         char *cf;
1316
1317         _argc = argc;
1318         _argv = argv;
1319
1320         if (cmdline_parser(argc, argv, &conf)) {
1321                 fprintf(stderr, "parse error while reading command line\n");
1322                 exit(EXIT_FAILURE);
1323         }
1324         init_theme(0, &theme);
1325         top.lines = theme.top_lines_default;
1326         if (check_key_map_args() < 0) {
1327                 fprintf(stderr, "invalid key map\n");
1328                 exit(EXIT_FAILURE);
1329         }
1330         cf = configfile_exists();
1331         if (!cf && conf.config_file_given) {
1332                 fprintf(stderr, "can not read config file %s\n",
1333                         conf.config_file_arg);
1334                 exit(EXIT_FAILURE);
1335         }
1336         if (cf)
1337                 cmdline_parser_configfile(cf, &conf, 0, 0, 0);
1338         if (check_key_map_args() < 0) {
1339                 fprintf(stderr, "invalid key map in config file\n");
1340                 exit(EXIT_FAILURE);
1341         }
1342         setup_signal_handling();
1343         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1344         initscr(); /* needed only once, always successful */
1345         init_curses();
1346         print_welcome();
1347         for (;;) {
1348                 print_status_bar();
1349                 ret = do_select(GETCH_MODE);
1350                 if (!ret)
1351                         continue;
1352                 print_in_bar(COLOR_MSG, " ");
1353                 handle_command(ret);
1354         }
1355 }