gui.c

   1 /*
   2  * Copyright (C) 1998-2007 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 "gui.h"
  24 #include <curses.h>
  25 #include "ringbuffer.h"
  26 #include "string.h"
  27 #include "fd.h"
  28 #include "error.h"
  29 #include "signal.h"
  30
  31 /** define the array of error lists needed by para_gui */
  32 INIT_GUI_ERRLISTS;
  33 extern const char *status_item_list[NUM_STAT_ITEMS];
  34 static char *stat_content[NUM_STAT_ITEMS];
  35
  36 #define STANDARD_STATUS_BAR "para_gui " PACKAGE_VERSION " (hit ? for help)"
  37
  38 static int signal_pipe;
  39
  40 static void finish(int sig);
  41
  42 static struct win_data {
  43         WINDOW *win;
  44         NCURSES_SIZE_T begx;
  45         NCURSES_SIZE_T begy;
  46         NCURSES_SIZE_T cols;
  47         NCURSES_SIZE_T lines;
  48 } top, bot, sb, in, sep;
  49
  50 #define RINGBUFFER_SIZE 512
  51 struct rb_entry {
  52         char *msg;
  53         size_t len;
  54         int color;
  55 };
  56 void *bot_win_rb;
  57 #define NUM_LINES(len) (1 + (len) / bot.cols)
  58
  59 static unsigned scroll_position;
  60
  61 static int cmd_died, curses_active;
  62 static pid_t cmd_pid;
  63
  64 static int command_pipe = -1;
  65 static int audiod_pipe = -1;
  66 static struct gui_args_info conf;
  67
  68 enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
  69
  70
  71 #define COLOR_STATUSBAR 32
  72 #define COLOR_COMMAND 33
  73 #define COLOR_OUTPUT 34
  74 #define COLOR_MSG 35
  75 #define COLOR_ERRMSG 36
  76 #define COLOR_WELCOME 37
  77 #define COLOR_SEPARATOR 38
  78 #define COLOR_TOP 39
  79 #define COLOR_BOT 40
  80
  81 struct gui_command {
  82         const char *key;
  83         const char *name;
  84         const char *description;
  85         void (*handler)(void);
  86 };
  87
  88 struct stat_item {
  89         char name[MAXLINE];
  90         char prefix[MAXLINE];
  91         char postfix[MAXLINE];
  92         unsigned y;
  93         unsigned x;
  94         unsigned len;
  95         int fg, bg;
  96         int align;
  97         char content[MAXLINE];
  98 };
  99
 100 static struct gui_theme theme;
 101
 102 int _argc;
 103 char **_argv;
 104
 105 static void com_help(void);
 106 static void com_reread_conf(void);
 107 static void com_enlarge_top_win(void);
 108 static void com_shrink_top_win(void);
 109 static void com_version(void);
 110 static void com_quit(void);
 111 static void com_refresh(void);
 112 static void com_ll_incr(void);
 113 static void com_ll_decr(void);
 114 static void com_prev_theme(void);
 115 static void com_next_theme(void);
 116 static void com_scroll_up(void);
 117 static void com_scroll_down(void);
 118 static void com_page_up(void);
 119 static void com_page_down(void);
 120
 121 struct gui_command command_list[] = {
 122         {
 123                 .key = "?",
 124                 .name = "help",
 125                 .description = "print help",
 126                 .handler = com_help
 127         }, {
 128                 .key = "+",
 129                 .name = "enlarge_win",
 130                 .description = "enlarge the top window",
 131                 .handler = com_enlarge_top_win
 132         }, {
 133                 .key = "-",
 134                 .name = "shrink_win",
 135                 .description = "shrink the top window",
 136                 .handler = com_shrink_top_win
 137         }, {
 138                 .key = "r",
 139                 .name = "reread_conf",
 140                 .description = "reread configuration file",
 141                 .handler = com_reread_conf
 142         }, {
 143                 .key = "q",
 144                 .name = "quit",
 145                 .description = "exit para_gui",
 146                 .handler = com_quit
 147         }, {
 148                 .key = "^L",
 149                 .name = "refresh",
 150                 .description = "redraw the screen",
 151                 .handler = com_refresh
 152         }, {
 153                 .key = ".",
 154                 .name = "next_theme",
 155                 .description = "switch to next theme",
 156                 .handler = com_next_theme
 157         }, {
 158                 .key = ",",
 159                 .name = "prev_theme",
 160                 .description = "switch to previous stream",
 161                 .handler = com_prev_theme
 162         }, {
 163                 .key = ">",
 164                 .name = "ll_incr",
 165                 .description = "increase loglevel (decreases verbosity)",
 166                 .handler = com_ll_incr
 167         }, {
 168                 .key = "<",
 169                 .name = "ll_decr",
 170                 .description = "decrease loglevel (increases verbosity)",
 171                 .handler = com_ll_decr
 172         }, {
 173                 .key = "V",
 174                 .name = "version",
 175                 .description = "show the para_gui version",
 176                 .handler = com_version
 177         }, {
 178                 .key = "<up>",
 179                 .name = "scroll_up",
 180                 .description = "scroll up one line",
 181                 .handler = com_scroll_up
 182         }, {
 183                 .key = "<down>",
 184                 .name = "scroll_down",
 185                 .description = "scroll down one line",
 186                 .handler = com_scroll_down
 187         }, {
 188                 .key = "<ppage>",
 189                 .name = "page_up",
 190                 .description = "scroll up one page",
 191                 .handler = com_page_up
 192         }, {
 193                 .key = "<npage>",
 194                 .name = "page_down",
 195                 .description = "scroll down one page",
 196                 .handler = com_page_down
 197         }, {
 198                 .handler = NULL
 199         }
 200 };
 201
 202 static int find_cmd_byname(char *name)
 203 {
 204         int i;
 205
 206         for (i = 0; command_list[i].handler; i++)
 207                 if (!strcmp(command_list[i].name, name))
 208                         return i;
 209         return -1;
 210 }
 211
 212 /* taken from mutt */
 213 static char *km_keyname(int c)
 214 {
 215         static char buf[10];
 216
 217         if (c == KEY_UP) {
 218                 sprintf(buf, "<up>");
 219                 return buf;
 220         }
 221         if (c == KEY_DOWN) {
 222                 sprintf(buf, "<down>");
 223                 return buf;
 224         }
 225         if (c == KEY_LEFT) {
 226                 sprintf(buf, "<left>");
 227                 return buf;
 228         }
 229         if (c == KEY_RIGHT) {
 230                 sprintf(buf, "<right>");
 231                 return buf;
 232         }
 233         if (c == KEY_NPAGE) {
 234                 sprintf(buf, "<npage>");
 235                 return buf;
 236         }
 237         if (c == KEY_PPAGE) {
 238                 sprintf(buf, "<ppage>");
 239                 return buf;
 240         }
 241         if (c < 256 && c > -128 && iscntrl((unsigned char) c)) {
 242                 if (c < 0)
 243                         c += 256;
 244                 if (c < 128) {
 245                         buf[0] = '^';
 246                         buf[1] = (c + '@') & 0x7f;
 247                         buf[2] = 0;
 248                 } else
 249                         snprintf(buf, sizeof(buf), "\\%d%d%d", c >> 6,
 250                                 (c >> 3) & 7, c & 7);
 251         } else if (c >= KEY_F0 && c < KEY_F(256))
 252                 sprintf(buf, "<F%d>", c - KEY_F0);
 253         else if (isprint(c))
 254                 snprintf(buf, sizeof(buf), "%c", (unsigned char) c);
 255         else
 256                 snprintf(buf, sizeof(buf), "\\x%hx", (unsigned short) c);
 257         return buf;
 258 }
 259
 260 static char *configfile_exists(void)
 261 {
 262         static char *config_file;
 263         char *tmp;
 264
 265         if (!conf.config_file_given) {
 266                 if (!config_file) {
 267                         char *home = para_homedir();
 268                         config_file = make_message("%s/.paraslash/gui.conf",
 269                                 home);
 270                         free(home);
 271                 }
 272                 tmp = config_file;
 273         } else
 274                 tmp = conf.config_file_arg;
 275         return file_exists(tmp)? tmp: NULL;
 276 }
 277
 278 /*
 279  * print num spaces to curses window
 280  */
 281 static void add_spaces(WINDOW* win, unsigned int num)
 282 {
 283         while (num > 0) {
 284                 num--;
 285                 waddstr(win, " ");
 286         }
 287 }
 288
 289 /*
 290  * print aligned string to curses window. This function always prints
 291  * exactly len chars.
 292  */
 293 static int align_str(WINDOW* win, const char *string, unsigned int len,
 294                 unsigned int align)
 295 {
 296         int num; /* of spaces */
 297         char *str;
 298
 299         if (!win || !string)
 300                 return -1;
 301         num = len - strlen(string);
 302         str = para_strdup(string);
 303         if (num < 0) {
 304                 str[len] = '\0';
 305                 num = 0;
 306         }
 307         if (align == LEFT) {
 308                 waddstr(win, str);
 309                 add_spaces(win, num);
 310         } else if (align == RIGHT) {
 311                 add_spaces(win, num);
 312                 waddstr(win, str);
 313         } else {
 314                 add_spaces(win, num / 2);
 315                 waddstr(win, str[0]? str: "");
 316                 add_spaces(win, num - num / 2);
 317         }
 318         free(str);
 319         return 1;
 320 }
 321
 322 __printf_2_3 static void print_in_bar(int color, const char *fmt,...)
 323 {
 324         char *msg;
 325
 326         if (!curses_active)
 327                 return;
 328         wattron(in.win, COLOR_PAIR(color));
 329         PARA_VSPRINTF(fmt, msg);
 330         wmove(in.win, 0, 0);
 331         align_str(in.win, msg, sb.cols, LEFT);
 332         free(msg);
 333         wrefresh(in.win);
 334 }
 335
 336 /*
 337  * update the status bar
 338  */
 339 static void print_status_bar(void)
 340 {
 341         if (!curses_active)
 342                 return;
 343         wmove(sb.win, 0, 0);
 344         align_str(sb.win, STANDARD_STATUS_BAR, sb.cols, CENTER);
 345         wrefresh(sb.win);
 346 }
 347
 348 /*
 349  * get the number of the oldest rbe that is (partially) visible. On return,
 350  * lines contains the sum of the number of lines of all visable entries. If the
 351  * first one is only partially visible, lines is greater than bot.lines.
 352  */
 353 static int first_visible_rbe(unsigned *lines)
 354 {
 355         int i;
 356         *lines = 0;
 357         for (i = scroll_position; i < RINGBUFFER_SIZE; i++) {
 358                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
 359                 int rbe_lines;
 360                 if (!rbe)
 361                         return i - 1;
 362 //              fprintf(stderr, "found: %s\n", rbe->msg);
 363                 rbe_lines = NUM_LINES(rbe->len);
 364                 if (rbe_lines > bot.lines)
 365                         return -1;
 366                 *lines += rbe_lines;
 367                 if (*lines >= bot.lines)
 368                         return i;
 369         }
 370         return RINGBUFFER_SIZE - 1;
 371 }
 372
 373 static int draw_top_rbe(unsigned *lines)
 374 {
 375         unsigned len;
 376         int offset, fvr = first_visible_rbe(lines);
 377         struct rb_entry *rbe;
 378
 379         if (fvr < 0)
 380                 return -1;
 381         wmove(bot.win, 0, 0);
 382         rbe = ringbuffer_get(bot_win_rb, fvr);
 383         if (!rbe)
 384                 return -1;
 385         /* first rbe might be only partially visible */
 386         offset = (*lines - bot.lines) * bot.cols;
 387         len = strlen(rbe->msg);
 388         if (offset < 0 || len < offset)
 389                 return -1;
 390         wattron(bot.win, COLOR_PAIR(rbe->color));
 391         waddstr(bot.win, rbe->msg + offset);
 392         *lines = NUM_LINES(len - offset);
 393         return fvr;
 394 }
 395
 396 static void redraw_bot_win(void)
 397 {
 398         unsigned lines;
 399         int i;
 400
 401         wmove(bot.win, 0, 0);
 402         wclear(bot.win);
 403         i = draw_top_rbe(&lines);
 404         if (i <= 0)
 405                 goto out;
 406         while (i > 0 && lines < bot.lines) {
 407                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, --i);
 408                 if (!rbe) {
 409                         lines++;
 410                         waddstr(bot.win, "\n");
 411                         continue;
 412                 }
 413                 lines += NUM_LINES(rbe->len);
 414                 wattron(bot.win, COLOR_PAIR(rbe->color));
 415                 waddstr(bot.win, "\n");
 416                 waddstr(bot.win, rbe->msg);
 417         }
 418 out:
 419         wrefresh(bot.win);
 420 }
 421
 422 static void rb_add_entry(int color, char *msg)
 423 {
 424         struct rb_entry *old, *new = para_malloc(sizeof(struct rb_entry));
 425         int x, y;
 426         new->color = color;
 427         new->len = strlen(msg);
 428         new->msg = msg;
 429         old = ringbuffer_add(bot_win_rb, new);
 430 //      fprintf(stderr, "added: %s\n", new->msg);
 431         if (old) {
 432                 free(old->msg);
 433                 free(old);
 434         }
 435         if (scroll_position) {
 436                 /* discard current scrolling, like xterm does */
 437                 scroll_position = 0;
 438                 redraw_bot_win();
 439                 return;
 440         }
 441         wattron(bot.win, COLOR_PAIR(color));
 442         getyx(bot.win, y, x);
 443         if (y || x)
 444                 waddstr(bot.win, "\n");
 445         waddstr(bot.win, msg);
 446 }
 447
 448 /*
 449  * print formated output to bot win and refresh
 450  */
 451 __printf_2_3 static void outputf(int color, const char* fmt,...)
 452 {
 453         char *msg;
 454
 455         if (!curses_active)
 456                 return;
 457         PARA_VSPRINTF(fmt, msg);
 458         rb_add_entry(color, msg);
 459         wrefresh(bot.win);
 460 }
 461
 462 static void add_output_line(char *line)
 463 {
 464         if (!curses_active)
 465                 return;
 466         rb_add_entry(COLOR_OUTPUT, para_strdup(line));
 467 }
 468
 469 void para_log(int ll, const char *fmt,...)
 470 {
 471         int color;
 472         char *msg;
 473
 474         if (ll < conf.loglevel_arg || !curses_active)
 475                 return;
 476         switch (ll) {
 477                 case DEBUG:
 478                 case INFO:
 479                 case NOTICE:
 480                         color = COLOR_MSG;
 481                         break;
 482                 default:
 483                         color = COLOR_ERRMSG;
 484         }
 485         PARA_VSPRINTF(fmt, msg);
 486         chop(msg);
 487         rb_add_entry(color, msg);
 488         wrefresh(bot.win);
 489 }
 490
 491 static void setup_signal_handling(void)
 492 {
 493         signal_pipe = para_signal_init();
 494         para_install_sighandler(SIGINT);
 495         para_install_sighandler(SIGTERM);
 496         para_install_sighandler(SIGCHLD);
 497         para_install_sighandler(SIGWINCH);
 498         para_install_sighandler(SIGUSR1);
 499         signal(SIGPIPE, SIG_IGN);
 500         signal(SIGHUP, SIG_IGN);
 501 }
 502
 503 static void do_exit(int ret)
 504 {
 505         signal(SIGTERM, SIG_IGN);
 506         kill(0, SIGTERM);
 507         exit(ret);
 508 }
 509
 510 static void shutdown_curses(void)
 511 {
 512         if (!curses_active)
 513                 return;
 514         def_prog_mode();
 515         curses_active = 0;
 516         endwin();
 517 }
 518
 519 static void finish(int ret)
 520 {
 521         shutdown_curses();
 522         do_exit(ret);
 523 }
 524
 525 /*
 526  * exit curses and print given message to stdout/stderr
 527  */
 528 __printf_2_3 static void msg_n_exit(int ret, const char* fmt, ...)
 529 {
 530         va_list argp;
 531         FILE *outfd = ret? stderr: stdout;
 532
 533         shutdown_curses();
 534         va_start(argp, fmt);
 535         vfprintf(outfd, fmt, argp);
 536         va_end(argp);
 537         do_exit(ret);
 538 }
 539
 540 static void print_welcome(void)
 541 {
 542         int ll = conf.loglevel_arg;
 543         if (ll > NOTICE)
 544                 return;
 545         outputf(COLOR_WELCOME, "Welcome to para_gui " PACKAGE_VERSION
 546                 " \"" CODENAME "\". Theme: %s", theme.name);
 547         wclrtoeol(bot.win);
 548 }
 549
 550 /*
 551  * init all windows
 552  */
 553 static void init_wins(int top_lines)
 554 {
 555         int i;
 556
 557         top.lines = top_lines;
 558         top.cols = COLS;
 559         top.begy = 0;
 560         top.begx = 0;
 561
 562         bot.lines = LINES - top.lines - 3;
 563         bot.cols = COLS;
 564         bot.begy = top.lines + 1;
 565         bot.begx = 0;
 566
 567         sb.lines = 1;
 568         sb.cols = COLS;
 569         sb.begy = LINES - 2;
 570         sb.begx = 0;
 571
 572         in.lines = 1;
 573         in.cols = COLS;
 574         in.begy = LINES - 1;
 575         in.begx = 0;
 576
 577         sep.lines = 1;
 578         sep.cols = COLS;
 579         sep.begy = top.lines;
 580         sep.begx = 0;
 581
 582         assume_default_colors(theme.default_fg, theme.default_bg);
 583         if (top.win) {
 584                 mvwin(top.win, top.begy, top.begx);
 585                 wresize(top.win, top.lines, top.cols);
 586
 587                 mvwin(sb.win, sb.begy, sb.begx);
 588                 wresize(sb.win, sb.lines, sb.cols);
 589
 590                 mvwin(sep.win, sep.begy, sep.begx);
 591                 wresize(sep.win, sep.lines, sep.cols);
 592
 593                 mvwin(bot.win, bot.begy, bot.begx);
 594                 wresize(bot.win, bot.lines, bot.cols);
 595
 596                 mvwin(in.win, in.begy, in.begx);
 597                 wresize(in.win, in.lines, in.cols);
 598         } else {
 599                 sep.win = newwin(sep.lines, sep.cols, sep.begy, sep.begx);
 600                 top.win = newwin(top.lines, top.cols, top.begy, top.begx);
 601                 bot.win = newwin(bot.lines, bot.cols, bot.begy, bot.begx);
 602                 sb.win = newwin(sb.lines, sb.cols, sb.begy, sb.begx);
 603                 in.win = newwin(in.lines, in.cols, in.begy, in.begx);
 604                 if (!top.win || !bot.win || !sb.win || !in.win || !sep.win)
 605                         msg_n_exit(1, "Error: Cannot create curses windows\n");
 606                 wclear(bot.win);
 607                 wclear(sb.win);
 608                 wclear(in.win);
 609                 scrollok(bot.win, 1);
 610                 wattron(sb.win, COLOR_PAIR(COLOR_STATUSBAR));
 611                 wattron(sep.win, COLOR_PAIR(COLOR_SEPARATOR));
 612                 wattron(bot.win, COLOR_PAIR(COLOR_BOT));
 613                 wattron(top.win, COLOR_PAIR(COLOR_TOP));
 614                 nodelay(top.win, 1);
 615                 nodelay(bot.win, 1);
 616                 nodelay(sb.win, 1);
 617                 nodelay(in.win, 0);
 618
 619                 keypad(top.win, 1);
 620                 keypad(bot.win, 1);
 621                 keypad(sb.win, 1);
 622                 keypad(in.win, 1);
 623                 print_status_bar();
 624         }
 625         wmove(sep.win, 0, 0);
 626         for (i = 1; i <= COLS; i++)
 627                 waddstr(sep.win, theme.sep_str);
 628         wclear(top.win);
 629         //wclear(bot.win);
 630         wnoutrefresh(top.win);
 631         wnoutrefresh(bot.win);
 632         //wnoutrefresh(sb.win);
 633         print_status_bar();
 634         wnoutrefresh(in.win);
 635         wnoutrefresh(sep.win);
 636         doupdate();
 637 }
 638
 639 static void check_geometry(void)
 640 {
 641         if (LINES < theme.lines_min || COLS < theme.cols_min)
 642                 msg_n_exit(EXIT_FAILURE, "Error: Terminal (%dx%d) too small"
 643                         " (need at least %dx%d)\n", COLS, LINES,
 644                         theme.cols_min, theme.lines_min);
 645 }
 646
 647 /*
 648  * Print stat item #i to curses window
 649  */
 650 static void print_stat_item(int i)
 651 {
 652         char *tmp;
 653         struct stat_item_data d = theme.data[i];
 654         char *c = stat_content[i];
 655
 656         if (!curses_active || !d.len || !c)
 657                 return;
 658         tmp = make_message("%s%s%s", d.prefix, c, d.postfix);
 659 //      PARA_DEBUG_LOG("%s: read: %s\n", __func__, tmp);
 660         wmove(top.win, d.y * top.lines / 100, d.x * COLS / 100);
 661         wrefresh(top.win);
 662         wattron(top.win, COLOR_PAIR(i + 1));
 663         align_str(top.win, tmp, d.len * COLS / 100, d.align);
 664         free(tmp);
 665         wrefresh(top.win);
 666 }
 667
 668 static void print_all_items(void)
 669 {
 670         int i;
 671
 672         if (!curses_active)
 673                 return;
 674         for (i = 0; i < NUM_STAT_ITEMS; i++)
 675                 print_stat_item(i);
 676 }
 677 static void clear_all_items(void)
 678 {
 679         int i;
 680
 681         for (i = 0; i < NUM_STAT_ITEMS; i++) {
 682                 free(stat_content[i]);
 683                 stat_content[i] = para_strdup("");
 684         }
 685 }
 686
 687 static void init_colors(void)
 688 {
 689         int i;
 690         if (!has_colors())
 691                 msg_n_exit(EXIT_FAILURE, "Error: No color term\n");
 692         start_color();
 693         for (i = 0; i < NUM_STAT_ITEMS; i++)
 694                 if (theme.data[i].len)
 695                         init_pair(i + 1, theme.data[i].fg, theme.data[i].bg);
 696         init_pair(COLOR_STATUSBAR, theme.sb_fg, theme.sb_bg);
 697         init_pair(COLOR_COMMAND, theme.cmd_fg, theme.cmd_bg);
 698         init_pair(COLOR_OUTPUT, theme.output_fg, theme.output_bg);
 699         init_pair(COLOR_MSG, theme.msg_fg, theme.msg_bg);
 700         init_pair(COLOR_ERRMSG, theme.err_msg_fg, theme.err_msg_bg);
 701         init_pair(COLOR_WELCOME, theme.welcome_fg, theme.welcome_bg);
 702         init_pair(COLOR_SEPARATOR, theme.sep_fg, theme.sep_bg);
 703         init_pair(COLOR_TOP, theme.default_fg, theme.default_bg);
 704         init_pair(COLOR_BOT, theme.default_fg, theme.default_bg);
 705 }
 706
 707 /*
 708  * (re-)initialize the curses library  FIXME: Error checking
 709  */
 710 static void init_curses(void)
 711 {
 712         curses_active = 1;
 713         if (top.win && refresh() == ERR) { /* refesh is really needed */
 714                 msg_n_exit(EXIT_FAILURE, "refresh() failed\n");
 715         }
 716         check_geometry();
 717         curs_set(0); /* make cursor invisible, ignore errors */
 718 //      if (noraw() == ERR);
 719 //              msg_n_exit(EXIT_FAILURE, "can not place terminal out of "
 720 //                      "raw mode\n");
 721         nonl(); /* tell curses not to do NL->CR/NL on output */
 722         noecho(); /* don't echo input */
 723         cbreak(); /* take input chars one at a time, no wait for \n */
 724         //reset_prog_mode();
 725         init_colors();
 726         clear();
 727         init_wins(theme.top_lines_default);
 728         print_all_items();
 729         noecho(); /* don't echo input */
 730 }
 731
 732
 733 static void check_sigchld(void)
 734 {
 735         pid_t pid;
 736 reap_next_child:
 737         pid = para_reap_child();
 738         if (pid <= 0)
 739                 return;
 740         if (pid == cmd_pid) {
 741                 cmd_pid = 0;
 742                 cmd_died = 1;
 743         }
 744         goto reap_next_child;
 745 }
 746
 747 /*
 748  * print status line if line starts with known command.
 749  */
 750 static void check_stat_line(char *line)
 751 {
 752         int i;
 753
 754 //      PARA_INFO_LOG("%s: checking: %s\n", __func__, line);
 755         i = stat_line_valid(line);
 756         if (i >= 0) {
 757                 line += strlen(status_item_list[i]) + 1;
 758                 free(stat_content[i]);
 759                 stat_content[i] = para_strdup(line);
 760                 print_stat_item(i);
 761         }
 762         return;
 763 }
 764
 765 /*
 766  * This sucker modifies its first argument. *handler and *arg are
 767  * pointers to 0-terminated strings (inside line). Crap.
 768  */
 769 static int split_key_map(char *line, char **handler, char **arg)
 770 {
 771         if (!(*handler = strchr(line + 1, ':')))
 772                 goto err_out;
 773         **handler = '\0';
 774         (*handler)++;
 775         if (!(*arg = strchr(*handler, ':')))
 776                 goto err_out;
 777         **arg = '\0';
 778         (*arg)++;
 779         return 1;
 780 err_out:
 781         return 0;
 782 }
 783
 784 static int check_key_map_args(void)
 785 {
 786         char *s;
 787         int i, ret = -1;
 788         char *tmp = NULL, *handler, *arg;
 789
 790         for (i = 0; i < conf.key_map_given; ++i) {
 791                 s = conf.key_map_arg[i];
 792                 if (!(*s))
 793                         goto err_out;
 794                 free(tmp);
 795                 tmp = para_strdup(s);
 796                 if (!split_key_map(tmp, &handler, &arg))
 797                         goto err_out;
 798                 if (strlen(handler) != 1)
 799                         goto err_out;
 800                 if (*handler != 'x'
 801                         && *handler != 'd'
 802                         && *handler != 'i'
 803                         && *handler != 'p')
 804                         goto err_out;
 805                 if (*handler != 'i')
 806                         continue;
 807                 if (find_cmd_byname(arg) < 0)
 808                         goto err_out;
 809         }
 810         ret = 0;
 811 err_out:
 812         free(tmp);
 813         return ret;
 814 }
 815
 816 /*
 817  * React to various signal-related events
 818  */
 819 static void handle_signal(int sig)
 820 {
 821         switch (sig) {
 822         case SIGTERM:
 823                 msg_n_exit(EXIT_FAILURE,
 824                         "only the good die young (caught SIGTERM))\n");
 825                 return;
 826         case SIGWINCH:
 827                 if (curses_active) {
 828                         shutdown_curses();
 829                         init_curses();
 830                         redraw_bot_win();
 831                 }
 832                 return;
 833         case SIGINT:
 834                 PARA_WARNING_LOG("%s", "caught SIGINT, reset");
 835                 /* Nothing to do. SIGINT killed our child, para_client stat.
 836                  * This get noticed by do_select which resets everything
 837                  */
 838                 return;
 839         case SIGUSR1:
 840                 PARA_NOTICE_LOG("%s", "got SIGUSR1, rereading configuration");
 841                 com_reread_conf();
 842                 return;
 843         case SIGCHLD:
 844                 check_sigchld();
 845                 return;
 846         }
 847 }
 848
 849 static int open_audiod_pipe(void)
 850 {
 851         static int init = 1;
 852
 853         if (init)
 854                 init = 0;
 855         else
 856                 sleep(1);
 857         return para_open_audiod_pipe(conf.stat_cmd_arg);
 858 }
 859
 860 /*
 861  * This is the core select loop. Besides the (internal) signal
 862  * pipe, the following other fds are checked according to the mode:
 863  *
 864  * GETCH_MODE: check stdin, return when key is pressed
 865  *
 866  * COMMAND_MODE: check command_pipe and stdin. Return when a screen full
 867  * of output has been read or when other end has closed command pipe or
 868  * when any key is pressed.
 869  *
 870  * EXTERNAL_MODE: Check only signal pipe. Used when an external command
 871  * is running. During that thime curses is disabled.  Returns when
 872  * cmd_pid == 0.
 873  */
 874 static int do_select(int mode)
 875 {
 876         fd_set rfds;
 877         int ret;
 878         int max_fileno, cp_numread = 1;
 879         char command_buf[4096] = "";
 880         int cbo = 0; /* command buf offset */
 881         struct timeval tv;
 882 repeat:
 883         tv.tv_sec = conf.timeout_arg  / 1000;
 884         tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
 885 //      ret = refresh_status();
 886         FD_ZERO(&rfds);
 887         max_fileno = 0;
 888         /* audiod pipe */
 889         if (audiod_pipe < 0)
 890                 audiod_pipe = open_audiod_pipe();
 891         if (audiod_pipe >= 0)
 892                 para_fd_set(audiod_pipe, &rfds, &max_fileno);
 893         /* signal pipe */
 894         para_fd_set(signal_pipe, &rfds, &max_fileno);
 895         /* command pipe only for COMMAND_MODE */
 896         if (command_pipe >= 0 && mode == COMMAND_MODE)
 897                 para_fd_set(command_pipe, &rfds, &max_fileno);
 898         ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
 899         if (ret <= 0)
 900                 goto check_return; /* skip fd checks */
 901         /* signals */
 902         if (FD_ISSET(signal_pipe, &rfds)) {
 903                 int sig_nr = para_next_signal();
 904                 if (sig_nr > 0)
 905                         handle_signal(sig_nr);
 906         }
 907         /* read command pipe if ready */
 908         if (command_pipe >= 0 && mode == COMMAND_MODE &&
 909                         FD_ISSET(command_pipe, &rfds)) {
 910                 cp_numread = read(command_pipe, command_buf + cbo,
 911                         sizeof(command_buf) - 1 - cbo);
 912                 if (cp_numread >= 0)
 913                         cbo += cp_numread;
 914                 else {
 915                         if (cp_numread < 0)
 916                                 PARA_ERROR_LOG("read error (%d)", cp_numread);
 917                         close(command_pipe);
 918                         command_pipe = -1;
 919                 }
 920         }
 921         if (audiod_pipe >= 0 && FD_ISSET(audiod_pipe, &rfds))
 922                 if (read_audiod_pipe(audiod_pipe, check_stat_line) <= 0) {
 923                         close(audiod_pipe);
 924                         audiod_pipe = -1;
 925                         clear_all_items();
 926                         free(stat_content[SI_STATUS_BAR]);
 927                         stat_content[SI_STATUS_BAR] =
 928                                 para_strdup("audiod not running!?");
 929                         print_all_items();
 930                 }
 931 check_return:
 932         switch (mode) {
 933         case COMMAND_MODE:
 934                 if (cp_numread <= 0 && !cbo) /* command complete */
 935                         return 0;
 936                 if (cbo)
 937                         cbo = for_each_line(command_buf, cbo, &add_output_line);
 938                 if (cp_numread <= 0)
 939                         cbo = 0;
 940                 wrefresh(bot.win);
 941                 ret = wgetch(top.win);
 942                 if (ret != ERR && ret != KEY_RESIZE) {
 943                         if (command_pipe) {
 944                                 close(command_pipe);
 945                                 command_pipe = -1;
 946                         }
 947                         if (cmd_pid)
 948                                 kill(cmd_pid, SIGTERM);
 949                         return -1;
 950                 }
 951                 break;
 952         case GETCH_MODE:
 953                 ret = wgetch(top.win);
 954                 if (ret != ERR && ret != KEY_RESIZE)
 955                         return ret;
 956                 break;
 957         case EXTERNAL_MODE:
 958                 if (cmd_died) {
 959                         cmd_died = 0;
 960                         return 0;
 961                 }
 962         }
 963         goto repeat;
 964 }
 965
 966 /*
 967  * read from command pipe and print data to bot window
 968  */
 969 static int send_output(void)
 970 {
 971         if (command_pipe < 0)
 972                 return 0;
 973         if (do_select(COMMAND_MODE) >= 0)
 974                 PARA_INFO_LOG("%s", "command complete");
 975         else
 976                 PARA_NOTICE_LOG("%s", "command aborted");
 977         print_in_bar(COLOR_MSG, " ");
 978         return 1;
 979 }
 980
 981 static int client_cmd_cmdline(char *cmd)
 982 {
 983         int ret, fds[3] = {0, 1, 0};
 984         char *c = make_message(BINDIR "/para_client %s", cmd);
 985
 986         outputf(COLOR_COMMAND, "%s", c);
 987         print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
 988         ret = para_exec_cmdline_pid(&cmd_pid, c, fds);
 989         free(c);
 990         if (ret < 0)
 991                 return -1;
 992         command_pipe = fds[1];
 993         mark_fd_nonblock(command_pipe);
 994         return send_output();
 995 }
 996
 997 /*
 998  * exec command and print output to bot win
 999  */
1000 static int display_cmd(char *cmd)
1001 {
1002         int fds[3] = {0, 1, 0};
1003
1004         print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
1005         outputf(COLOR_COMMAND, "%s", cmd);
1006         if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
1007                 return -1;
1008         command_pipe = fds[1];
1009         mark_fd_nonblock(command_pipe);
1010         return send_output();
1011 }
1012
1013 /*
1014  * shutdown curses and stat pipe before executing external commands
1015  */
1016 static int external_cmd(char *cmd)
1017 {
1018         int fds[3] = {-1, -1, -1};
1019
1020         if (cmd_pid)
1021                 return -1;
1022         shutdown_curses();
1023         para_exec_cmdline_pid(&cmd_pid, cmd, fds);
1024         cmd_died = 0;
1025         do_select(EXTERNAL_MODE);
1026         init_curses();
1027         return 0;
1028 }
1029
1030 static void print_scroll_msg(void)
1031 {
1032         unsigned lines_total, filled = ringbuffer_filled(bot_win_rb);
1033         int first_rbe = first_visible_rbe(&lines_total);
1034         print_in_bar(COLOR_MSG, "scrolled view: %d-%d/%d\n", filled - first_rbe,
1035                 filled - scroll_position, ringbuffer_filled(bot_win_rb));
1036 }
1037
1038 static void com_page_down(void)
1039 {
1040         unsigned lines = 0;
1041         int i = scroll_position;
1042         while (lines < bot.lines && --i > 0) {
1043                 struct rb_entry *rbe = ringbuffer_get(bot_win_rb, i);
1044                 if (!rbe)
1045                         break;
1046                 lines += NUM_LINES(strlen(rbe->msg));
1047         }
1048         if (lines) {
1049                 scroll_position = i;
1050                 redraw_bot_win();
1051                 print_scroll_msg();
1052                 return;
1053         }
1054         print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1055 }
1056
1057 static void com_page_up(void)
1058 {
1059         unsigned lines;
1060         int fvr = first_visible_rbe(&lines);
1061         if (fvr < 0 || fvr + 1 >= ringbuffer_filled(bot_win_rb)) {
1062                 print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1063                 return;
1064         }
1065         scroll_position = fvr + 1;
1066         for (; scroll_position > 0; scroll_position--) {
1067                 fvr = first_visible_rbe(&lines);
1068                 if (lines == bot.lines)
1069                         break;
1070         }
1071         redraw_bot_win();
1072         print_scroll_msg();
1073 }
1074
1075 static void com_scroll_down(void)
1076 {
1077         struct rb_entry *rbe;
1078         int rbe_lines;
1079
1080         if (!scroll_position) {
1081                 print_in_bar(COLOR_ERRMSG, "bottom of buffer is shown\n");
1082                 return;
1083         }
1084         scroll_position--;
1085         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1086         rbe_lines = NUM_LINES(rbe->len);
1087         wscrl(bot.win, rbe_lines);
1088         wmove(bot.win, bot.lines - rbe_lines, 0);
1089         wattron(bot.win, COLOR_PAIR(rbe->color));
1090         waddstr(bot.win, rbe->msg);
1091         wrefresh(bot.win);
1092         print_scroll_msg();
1093 }
1094
1095 static void com_scroll_up(void)
1096 {
1097         struct rb_entry *rbe = NULL;
1098         unsigned lines;
1099         int i, first_rbe, num_scroll;
1100
1101         /* the entry that is going to vanish */
1102         rbe = ringbuffer_get(bot_win_rb, scroll_position);
1103         if (!rbe)
1104                 goto err_out;
1105         num_scroll = NUM_LINES(rbe->len);
1106         first_rbe = first_visible_rbe(&lines);
1107         if (first_rbe < 0 || (first_rbe == ringbuffer_filled(bot_win_rb) - 1))
1108                 goto err_out;
1109         scroll_position++;
1110         wscrl(bot.win, -num_scroll);
1111         i = draw_top_rbe(&lines);
1112         if (i < 0)
1113                 goto err_out;
1114         while (i > 0 && lines < num_scroll) {
1115                 int rbe_lines;
1116                 rbe = ringbuffer_get(bot_win_rb, --i);
1117                 if (!rbe)
1118                         break;
1119                 rbe_lines = NUM_LINES(rbe->len);
1120                 lines += rbe_lines;
1121 //              fprintf(stderr, "msg: %s\n", rbe->msg);
1122                 wattron(bot.win, COLOR_PAIR(rbe->color));
1123                 waddstr(bot.win, "\n");
1124                 waddstr(bot.win, rbe->msg);
1125                 if (!i)
1126                         break;
1127                 i--;
1128         }
1129         wrefresh(bot.win);
1130         print_scroll_msg();
1131         return;
1132 err_out:
1133         print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
1134 }
1135
1136 static void com_ll_decr(void)
1137 {
1138         if (conf.loglevel_arg <= DEBUG) {
1139                 print_in_bar(COLOR_ERRMSG,
1140                         "loglevel already at maximal verbosity\n");
1141                 return;
1142         }
1143         conf.loglevel_arg--;
1144         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1145 }
1146
1147 static void com_ll_incr(void)
1148 {
1149         if (conf.loglevel_arg >= EMERG) {
1150                 print_in_bar(COLOR_ERRMSG,
1151                         "loglevel already at miminal verbosity\n");
1152                 return;
1153         }
1154         conf.loglevel_arg++;
1155         print_in_bar(COLOR_MSG, "loglevel set to %d\n", conf.loglevel_arg);
1156 }
1157
1158 /*
1159  * reread configuration, terminate on errors
1160  */
1161 static void com_reread_conf(void)
1162 {
1163         char *cf =configfile_exists();
1164
1165         if (!cf) {
1166                 PARA_WARNING_LOG("%s", "there is no configuration to read");
1167                 return;
1168         }
1169         PARA_INFO_LOG("%s", "rereading command line options and config file");
1170         gui_cmdline_parser(_argc, _argv, &conf);
1171         gui_cmdline_parser_configfile(cf, &conf, 1, 1, 0);
1172         PARA_NOTICE_LOG("%s", "config file reloaded");
1173         if (check_key_map_args() < 0)
1174                 finish(EXIT_FAILURE);
1175 }
1176
1177 static void com_help(void)
1178 {
1179         int i;
1180
1181         for (i = 0; i < conf.key_map_given; ++i) {
1182                 char *handler, *arg, *tmp = para_strdup(conf.key_map_arg[i]);
1183                 const char *handler_text = "???", *desc = NULL;
1184
1185                 if (!split_key_map(tmp, &handler, &arg)) {
1186                         free(tmp);
1187                         return;
1188                 }
1189                 switch (*handler) {
1190                         case 'i':
1191                                 handler_text = "internal";
1192                                 desc = command_list[find_cmd_byname(arg)].description;
1193                                 break;
1194                         case 'x': handler_text = "external"; break;
1195                         case 'd': handler_text = "display "; break;
1196                         case 'p': handler_text = "para    "; break;
1197                 }
1198                 outputf(COLOR_MSG, "%s\t%s\t%s%s\t%s", tmp, handler_text, arg,
1199                         strlen(arg) < 8? "\t" : "",
1200                         desc? desc : "");
1201                 free(tmp);
1202         }
1203         for (i = 0; command_list[i].handler; i++) {
1204                 struct gui_command gc = command_list[i];
1205
1206                 outputf(COLOR_MSG, "%s\tinternal\t%s\t%s%s", gc.key, gc.name,
1207                         strlen(gc.name) < 8? "\t" : "",
1208                         gc.description);
1209         }
1210         print_in_bar(COLOR_MSG, "try \"para_gui -h\" or \"para_client help\" "
1211                 "for more info");
1212 }
1213
1214 static void com_shrink_top_win(void)
1215 {
1216         if (top.lines <= theme.top_lines_min) {
1217                 PARA_WARNING_LOG("%s", "can not decrease top window");
1218                 return;
1219         }
1220         init_wins(top.lines - 1);
1221         wclear(top.win);
1222         print_all_items();
1223         print_in_bar(COLOR_MSG, "%s", "decreased top window");
1224 }
1225
1226 static void com_enlarge_top_win(void)
1227 {
1228         if (bot.lines < 3) {
1229                 PARA_WARNING_LOG("%s", "can not increase top window");
1230                 return;
1231         }
1232         init_wins(top.lines + 1);
1233         wclear(top.win);
1234         print_all_items();
1235         print_in_bar(COLOR_MSG, "increased top window");
1236 }
1237
1238 static void com_version(void)
1239 {
1240         print_in_bar(COLOR_MSG, "para_gui " PACKAGE_VERSION " \""
1241                 CODENAME "\"");
1242 }
1243
1244 static void com_quit(void)
1245 {
1246         finish(0);
1247 }
1248
1249 static void com_refresh(void)
1250 {
1251         shutdown_curses();
1252         init_curses();
1253 }
1254
1255 static void change_theme(int next)
1256 {
1257         if (next)
1258                 next_theme(&theme);
1259         else
1260                 prev_theme(&theme);
1261         /* This seems to be needed twice, why? */
1262         com_refresh();
1263         com_refresh();
1264         PARA_NOTICE_LOG("new theme: %s", theme.name);
1265 }
1266
1267 static void com_next_theme(void)
1268 {
1269         change_theme(1);
1270 }
1271
1272 static void com_prev_theme(void)
1273 {
1274         change_theme(0);
1275 }
1276
1277
1278 static void handle_command(int c)
1279 {
1280         int i;
1281
1282         /* first check user's key bindings */
1283         for (i = 0; i < conf.key_map_given; ++i) {
1284                 char tmp[MAXLINE], *handler, *arg;
1285
1286                 strcpy(tmp, conf.key_map_arg[i]);
1287                 if (!split_key_map(tmp, &handler, &arg))
1288                         return;
1289                 if (!strcmp(tmp, km_keyname(c))) {
1290                         if (*handler == 'd') {
1291                                 display_cmd(arg);
1292                                 return;
1293                         }
1294                         if (*handler == 'x') {
1295                                 external_cmd(arg);
1296                                 return;
1297                         }
1298                         if (*handler == 'p') {
1299                                 client_cmd_cmdline(arg);
1300                                 return;
1301                         }
1302                         if (*handler == 'i') {
1303                                 int num = find_cmd_byname(arg);
1304                                 if (num >= 0)
1305                                         command_list[num].handler();
1306                                 return;
1307                         }
1308                 }
1309         }
1310         /* not found, check internal key bindings */
1311         for (i = 0; command_list[i].handler; i++) {
1312                 if (!strcmp(km_keyname(c), command_list[i].key)) {
1313                         command_list[i].handler();
1314                         return;
1315                 }
1316         }
1317         print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
1318                 km_keyname(c));
1319 }
1320
1321 int main(int argc, char *argv[])
1322 {
1323         int ret;
1324         char *cf;
1325
1326         _argc = argc;
1327         _argv = argv;
1328
1329         if (gui_cmdline_parser(argc, argv, &conf)) {
1330                 fprintf(stderr, "parse error while reading command line\n");
1331                 exit(EXIT_FAILURE);
1332         }
1333         HANDLE_VERSION_FLAG("gui", conf);
1334         init_theme(0, &theme);
1335         top.lines = theme.top_lines_default;
1336         if (check_key_map_args() < 0) {
1337                 fprintf(stderr, "invalid key map\n");
1338                 exit(EXIT_FAILURE);
1339         }
1340         cf = configfile_exists();
1341         if (!cf && conf.config_file_given) {
1342                 fprintf(stderr, "can not read config file %s\n",
1343                         conf.config_file_arg);
1344                 exit(EXIT_FAILURE);
1345         }
1346         if (cf)
1347                 gui_cmdline_parser_configfile(cf, &conf, 0, 0, 0);
1348         if (check_key_map_args() < 0) {
1349                 fprintf(stderr, "invalid key map in config file\n");
1350                 exit(EXIT_FAILURE);
1351         }
1352         setup_signal_handling();
1353         bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
1354         initscr(); /* needed only once, always successful */
1355         init_curses();
1356         print_welcome();
1357         for (;;) {
1358                 print_status_bar();
1359                 ret = do_select(GETCH_MODE);
1360                 if (!ret)
1361                         continue;
1362                 print_in_bar(COLOR_MSG, " ");
1363                 handle_command(ret);
1364         }
1365 }