normal/menu_entry.c

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 2005,2006,2007  Free Software Foundation, Inc.
   4  *
   5  *  GRUB is free software: you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation, either version 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18
  19 #include <grub/normal.h>
  20 #include <grub/term.h>
  21 #include <grub/misc.h>
  22 #include <grub/mm.h>
  23 #include <grub/loader.h>
  24 #include <grub/script.h>
  25
  26 enum update_mode
  27   {
  28     NO_LINE,
  29     SINGLE_LINE,
  30     ALL_LINES
  31   };
  32
  33 struct line
  34 {
  35   /* The line buffer.  */
  36   char *buf;
  37   /* The length of the line.  */
  38   int len;
  39   /* The maximum length of the line.  */
  40   int max_len;
  41 };
  42
  43 struct screen
  44 {
  45   /* The array of lines.  */
  46   struct line *lines;
  47   /* The number of lines.  */
  48   int num_lines;
  49   /* The current column.  */
  50   int column;
  51   /* The real column.  */
  52   int real_column;
  53   /* The current line.  */
  54   int line;
  55   /* The X coordinate.  */
  56   int x;
  57   /* The Y coordinate.  */
  58   int y;
  59   /* The kill buffer.  */
  60   char *killed_text;
  61   /* The flag of a completion window.  */
  62   int completion_shown;
  63 };
  64
  65 /* Used for storing completion items temporarily.  */
  66 static struct line completion_buffer;
  67
  68 /* Initialize a line.  */
  69 static int
  70 init_line (struct line *linep)
  71 {
  72   linep->len = 0;
  73   linep->max_len = 80; /* XXX */
  74   linep->buf = grub_malloc (linep->max_len);
  75   if (! linep->buf)
  76     return 0;
  77
  78   return 1;
  79 }
  80
  81 /* Allocate extra space if necessary.  */
  82 static int
  83 ensure_space (struct line *linep, int extra)
  84 {
  85   if (linep->max_len < linep->len + extra)
  86     {
  87       linep->max_len = linep->len + extra + 80; /* XXX */
  88       linep->buf = grub_realloc (linep->buf, linep->max_len + 1);
  89       if (! linep->buf)
  90         return 0;
  91     }
  92
  93   return 1;
  94 }
  95
  96 /* Return the number of lines occupied by this line on the screen.  */
  97 static int
  98 get_logical_num_lines (struct line *linep)
  99 {
 100   return (linep->len / GRUB_TERM_ENTRY_WIDTH) + 1;
 101 }
 102
 103 /* Print a line.  */
 104 static void
 105 print_line (struct line *linep, int offset, int start, int y)
 106 {
 107   int i;
 108   char *p;
 109
 110   grub_gotoxy (GRUB_TERM_LEFT_BORDER_X + GRUB_TERM_MARGIN + start + 1,
 111                y + GRUB_TERM_FIRST_ENTRY_Y);
 112
 113   for (p = linep->buf + offset + start, i = start;
 114        i < GRUB_TERM_ENTRY_WIDTH && offset + i < linep->len;
 115        p++, i++)
 116     grub_putchar (*p);
 117
 118   for (; i < GRUB_TERM_ENTRY_WIDTH; i++)
 119     grub_putchar (' ');
 120
 121   if (linep->len >= offset + GRUB_TERM_ENTRY_WIDTH)
 122     grub_putchar ('\\');
 123   else
 124     grub_putchar (' ');
 125 }
 126
 127 /* Print an empty line.  */
 128 static void
 129 print_empty_line (int y)
 130 {
 131   int i;
 132
 133   grub_gotoxy (GRUB_TERM_LEFT_BORDER_X + GRUB_TERM_MARGIN + 1,
 134                y + GRUB_TERM_FIRST_ENTRY_Y);
 135
 136   for (i = 0; i < GRUB_TERM_ENTRY_WIDTH + 1; i++)
 137     grub_putchar (' ');
 138 }
 139
 140 /* Print an up arrow.  */
 141 static void
 142 print_up (int flag)
 143 {
 144   grub_gotoxy (GRUB_TERM_LEFT_BORDER_X + GRUB_TERM_BORDER_WIDTH,
 145                GRUB_TERM_FIRST_ENTRY_Y);
 146
 147   if (flag)
 148     grub_putcode (GRUB_TERM_DISP_UP);
 149   else
 150     grub_putchar (' ');
 151 }
 152
 153 /* Print a down arrow.  */
 154 static void
 155 print_down (int flag)
 156 {
 157   grub_gotoxy (GRUB_TERM_LEFT_BORDER_X + GRUB_TERM_BORDER_WIDTH,
 158                GRUB_TERM_TOP_BORDER_Y + GRUB_TERM_NUM_ENTRIES);
 159
 160   if (flag)
 161     grub_putcode (GRUB_TERM_DISP_DOWN);
 162   else
 163     grub_putchar (' ');
 164 }
 165
 166 /* Draw the lines of the screen SCREEN.  */
 167 static void
 168 update_screen (struct screen *screen, int region_start, int region_column,
 169                int up, int down, enum update_mode mode)
 170 {
 171   int up_flag = 0;
 172   int down_flag = 0;
 173   int y;
 174   int i;
 175   struct line *linep;
 176
 177   /* Check if scrolling is necessary.  */
 178   if (screen->y < 0 || screen->y >= GRUB_TERM_NUM_ENTRIES)
 179     {
 180       if (screen->y < 0)
 181         screen->y = 0;
 182       else
 183         screen->y = GRUB_TERM_NUM_ENTRIES - 1;
 184
 185       region_start = 0;
 186       region_column = 0;
 187       up = 1;
 188       down = 1;
 189       mode = ALL_LINES;
 190     }
 191
 192   if (mode != NO_LINE)
 193     {
 194       /* Draw lines. This code is tricky, because this must calculate logical
 195          positions.  */
 196       y = screen->y - screen->column / GRUB_TERM_ENTRY_WIDTH;
 197       i = screen->line;
 198       linep = screen->lines + i;
 199       while (y > 0)
 200         {
 201            i--;
 202            linep--;
 203            y -= get_logical_num_lines (linep);
 204         }
 205
 206       if (y < 0 || i > 0)
 207         up_flag = 1;
 208
 209       do
 210         {
 211           int column;
 212
 213           for (column = 0;
 214                column <= linep->len && y < GRUB_TERM_NUM_ENTRIES;
 215                column += GRUB_TERM_ENTRY_WIDTH, y++)
 216             {
 217               if (y < 0)
 218                 continue;
 219
 220               if (i == region_start)
 221                 {
 222                   if (region_column >= column
 223                       && region_column < column + GRUB_TERM_ENTRY_WIDTH)
 224                     print_line (linep, column, region_column - column, y);
 225                   else if (region_column < column)
 226                     print_line (linep, column, 0, y);
 227                 }
 228               else if (i > region_start && mode == ALL_LINES)
 229                 print_line (linep, column, 0, y);
 230             }
 231
 232           if (y == GRUB_TERM_NUM_ENTRIES)
 233             {
 234               if (column <= linep->len || i + 1 < screen->num_lines)
 235                 down_flag = 1;
 236             }
 237
 238           linep++;
 239           i++;
 240
 241           if (mode == ALL_LINES && i == screen->num_lines)
 242             for (; y < GRUB_TERM_NUM_ENTRIES; y++)
 243               print_empty_line (y);
 244
 245         }
 246       while (y < GRUB_TERM_NUM_ENTRIES);
 247
 248       /* Draw up and down arrows.  */
 249       if (up)
 250         print_up (up_flag);
 251       if (down)
 252         print_down (down_flag);
 253     }
 254
 255   /* Place the cursor.  */
 256   grub_gotoxy (GRUB_TERM_LEFT_BORDER_X + GRUB_TERM_MARGIN + 1 + screen->x,
 257                GRUB_TERM_FIRST_ENTRY_Y + screen->y);
 258
 259   grub_refresh ();
 260 }
 261
 262 /* Insert the string S into the screen SCREEN. This updates the cursor
 263    position and redraw the screen. Return zero if fails.  */
 264 static int
 265 insert_string (struct screen *screen, char *s, int update)
 266 {
 267   int region_start = screen->num_lines;
 268   int region_column = 0;
 269   int down = 0;
 270   enum update_mode mode = NO_LINE;
 271
 272   while (*s)
 273     {
 274       if (*s == '\n')
 275         {
 276           /* LF is special because it creates a new line.  */
 277           struct line *current_linep;
 278           struct line *next_linep;
 279           int size;
 280
 281           /* Make a new line.  */
 282           screen->num_lines++;
 283           screen->lines = grub_realloc (screen->lines,
 284                                         screen->num_lines
 285                                         * sizeof (struct line));
 286           if (! screen->lines)
 287             return 0;
 288
 289           /* Scroll down. */
 290           grub_memmove (screen->lines + screen->line + 2,
 291                         screen->lines + screen->line + 1,
 292                         ((screen->num_lines - screen->line - 2)
 293                          * sizeof (struct line)));
 294
 295           if (! init_line (screen->lines + screen->line + 1))
 296             return 0;
 297
 298           /* Fold the line.  */
 299           current_linep = screen->lines + screen->line;
 300           next_linep = current_linep + 1;
 301           size = current_linep->len - screen->column;
 302
 303           if (! ensure_space (next_linep, size))
 304             return 0;
 305
 306           grub_memmove (next_linep->buf,
 307                         current_linep->buf + screen->column,
 308                         size);
 309           current_linep->len = screen->column;
 310           next_linep->len = size;
 311
 312           /* Update a dirty region.  */
 313           if (region_start > screen->line)
 314             {
 315               region_start = screen->line;
 316               region_column = screen->column;
 317             }
 318
 319           mode = ALL_LINES;
 320           down = 1; /* XXX not optimal.  */
 321
 322           /* Move the cursor.  */
 323           screen->column = screen->real_column = 0;
 324           screen->line++;
 325           screen->x = 0;
 326           screen->y++;
 327
 328           s++;
 329         }
 330       else
 331         {
 332           /* All but LF.  */
 333           char *p;
 334           struct line *current_linep;
 335           int size;
 336           int orig_num, new_num;
 337
 338           /* Find a string delimitted by LF.  */
 339           p = grub_strchr (s, '\n');
 340           if (! p)
 341             p = s + grub_strlen (s);
 342
 343           /* Insert the string.  */
 344           current_linep = screen->lines + screen->line;
 345           size = p - s;
 346           if (! ensure_space (current_linep, size))
 347             return 0;
 348
 349           grub_memmove (current_linep->buf + screen->column + size,
 350                         current_linep->buf + screen->column,
 351                         current_linep->len - screen->column);
 352           grub_memmove (current_linep->buf + screen->column,
 353                         s,
 354                         size);
 355           orig_num = get_logical_num_lines (current_linep);
 356           current_linep->len += size;
 357           new_num = get_logical_num_lines (current_linep);
 358
 359           /* Update the dirty region.  */
 360           if (region_start > screen->line)
 361             {
 362               region_start = screen->line;
 363               region_column = screen->column;
 364             }
 365
 366           if (orig_num != new_num)
 367             {
 368               mode = ALL_LINES;
 369               down = 1; /* XXX not optimal.  */
 370             }
 371           else if (mode != ALL_LINES)
 372             mode = SINGLE_LINE;
 373
 374           /* Move the cursor.  */
 375           screen->column += size;
 376           screen->real_column = screen->column;
 377           screen->x += size;
 378           screen->y += screen->x / GRUB_TERM_ENTRY_WIDTH;
 379           screen->x %= GRUB_TERM_ENTRY_WIDTH;
 380
 381           s = p;
 382         }
 383     }
 384
 385   if (update)
 386     update_screen (screen, region_start, region_column, 0, down, mode);
 387
 388   return 1;
 389 }
 390
 391 /* Release the resource allocated for SCREEN.  */
 392 static void
 393 destroy_screen (struct screen *screen)
 394 {
 395   int i;
 396
 397   if (screen->lines)
 398     for (i = 0; i < screen->num_lines; i++)
 399       {
 400         struct line *linep = screen->lines + i;
 401
 402         if (linep)
 403           grub_free (linep->buf);
 404       }
 405
 406   grub_free (screen->killed_text);
 407   grub_free (screen->lines);
 408   grub_free (screen);
 409 }
 410
 411 /* Make a new screen.  */
 412 static struct screen *
 413 make_screen (grub_menu_entry_t entry)
 414 {
 415   struct screen *screen;
 416
 417   /* Initialize the screen.  */
 418   screen = grub_malloc (sizeof (*screen));
 419   if (! screen)
 420     return 0;
 421
 422   screen->num_lines = 1;
 423   screen->column = 0;
 424   screen->real_column = 0;
 425   screen->line = 0;
 426   screen->x = 0;
 427   screen->y = 0;
 428   screen->killed_text = 0;
 429   screen->completion_shown = 0;
 430   screen->lines = grub_malloc (sizeof (struct line));
 431   if (! screen->lines)
 432     goto fail;
 433
 434   /* Initialize the first line which must be always present.  */
 435   if (! init_line (screen->lines))
 436     goto fail;
 437
 438   insert_string (screen, (char *) entry->sourcecode, 0);
 439
 440   /* Reset the cursor position.  */
 441   screen->column = 0;
 442   screen->real_column = 0;
 443   screen->line = 0;
 444   screen->x = 0;
 445   screen->y = 0;
 446
 447   return screen;
 448
 449  fail:
 450   destroy_screen (screen);
 451   return 0;
 452 }
 453
 454 static int
 455 forward_char (struct screen *screen, int update)
 456 {
 457   struct line *linep;
 458
 459   linep = screen->lines + screen->line;
 460   if (screen->column < linep->len)
 461     {
 462       screen->column++;
 463       screen->x++;
 464       if (screen->x == GRUB_TERM_ENTRY_WIDTH)
 465         {
 466           screen->x = 0;
 467           screen->y++;
 468         }
 469     }
 470   else if (screen->num_lines > screen->line + 1)
 471     {
 472       screen->column = 0;
 473       screen->line++;
 474       screen->x = 0;
 475       screen->y++;
 476     }
 477
 478   screen->real_column = screen->column;
 479
 480   if (update)
 481     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 482   return 1;
 483 }
 484
 485 static int
 486 backward_char (struct screen *screen, int update)
 487 {
 488   if (screen->column > 0)
 489     {
 490       screen->column--;
 491       screen->x--;
 492       if (screen->x == -1)
 493         {
 494           screen->x = GRUB_TERM_ENTRY_WIDTH - 1;
 495           screen->y--;
 496         }
 497     }
 498   else if (screen->line > 0)
 499     {
 500       struct line *linep;
 501
 502       screen->line--;
 503       linep = screen->lines + screen->line;
 504       screen->column = linep->len;
 505       screen->x = screen->column % GRUB_TERM_ENTRY_WIDTH;
 506       screen->y--;
 507     }
 508
 509   screen->real_column = screen->column;
 510
 511   if (update)
 512     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 513
 514   return 1;
 515 }
 516
 517 static int
 518 previous_line (struct screen *screen, int update)
 519 {
 520   if (screen->line > 0)
 521     {
 522       struct line *linep;
 523       int dy;
 524
 525       /* How many physical lines from the current position
 526          to the first physical line?  */
 527       dy = screen->column / GRUB_TERM_ENTRY_WIDTH;
 528
 529       screen->line--;
 530
 531       linep = screen->lines + screen->line;
 532       if (linep->len < screen->real_column)
 533         screen->column = linep->len;
 534       else
 535         screen->column = screen->real_column;
 536
 537       /* How many physical lines from the current position
 538          to the last physical line?  */
 539       dy += (linep->len / GRUB_TERM_ENTRY_WIDTH
 540              - screen->column / GRUB_TERM_ENTRY_WIDTH);
 541
 542       screen->y -= dy + 1;
 543       screen->x = screen->column % GRUB_TERM_ENTRY_WIDTH;
 544     }
 545   else
 546     {
 547       screen->y -= screen->column / GRUB_TERM_ENTRY_WIDTH;
 548       screen->column = 0;
 549       screen->x = 0;
 550     }
 551
 552   if (update)
 553     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 554
 555   return 1;
 556 }
 557
 558 static int
 559 next_line (struct screen *screen, int update)
 560 {
 561   if (screen->line < screen->num_lines - 1)
 562     {
 563       struct line *linep;
 564       int dy;
 565
 566       /* How many physical lines from the current position
 567          to the last physical line?  */
 568       linep = screen->lines + screen->line;
 569       dy = (linep->len / GRUB_TERM_ENTRY_WIDTH
 570             - screen->column / GRUB_TERM_ENTRY_WIDTH);
 571
 572       screen->line++;
 573
 574       linep++;
 575       if (linep->len < screen->real_column)
 576         screen->column = linep->len;
 577       else
 578         screen->column = screen->real_column;
 579
 580       /* How many physical lines from the current position
 581          to the first physical line?  */
 582       dy += screen->column / GRUB_TERM_ENTRY_WIDTH;
 583
 584       screen->y += dy + 1;
 585       screen->x = screen->column % GRUB_TERM_ENTRY_WIDTH;
 586     }
 587   else
 588     {
 589       struct line *linep;
 590
 591       linep = screen->lines + screen->line;
 592       screen->y += (linep->len / GRUB_TERM_ENTRY_WIDTH
 593                     - screen->column / GRUB_TERM_ENTRY_WIDTH);
 594       screen->column = linep->len;
 595       screen->x = screen->column % GRUB_TERM_ENTRY_WIDTH;
 596     }
 597
 598   if (update)
 599     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 600
 601   return 1;
 602 }
 603
 604 static int
 605 beginning_of_line (struct screen *screen, int update)
 606 {
 607   screen->y -= screen->column / GRUB_TERM_ENTRY_WIDTH;
 608   screen->column = screen->real_column = 0;
 609   screen->x = 0;
 610
 611   if (update)
 612     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 613
 614   return 1;
 615 }
 616
 617 static int
 618 end_of_line (struct screen *screen, int update)
 619 {
 620   struct line *linep;
 621
 622   linep = screen->lines + screen->line;
 623   screen->y += (linep->len / GRUB_TERM_ENTRY_WIDTH
 624                 - screen->column / GRUB_TERM_ENTRY_WIDTH);
 625   screen->column = screen->real_column = linep->len;
 626   screen->x = screen->column % GRUB_TERM_ENTRY_WIDTH;
 627
 628   if (update)
 629     update_screen (screen, screen->num_lines, 0, 0, 0, NO_LINE);
 630
 631   return 1;
 632 }
 633
 634 static int
 635 delete_char (struct screen *screen, int update)
 636 {
 637   struct line *linep;
 638   enum update_mode mode = NO_LINE;
 639   int start = screen->num_lines;
 640   int column = 0;
 641   int down = 0;
 642
 643   linep = screen->lines + screen->line;
 644   if (linep->len > screen->column)
 645     {
 646       int orig_num, new_num;
 647
 648       orig_num = get_logical_num_lines (linep);
 649
 650       grub_memmove (linep->buf + screen->column,
 651                     linep->buf + screen->column + 1,
 652                     linep->len - screen->column - 1);
 653       linep->len--;
 654
 655       new_num = get_logical_num_lines (linep);
 656
 657       if (orig_num != new_num)
 658         mode = ALL_LINES;
 659       else
 660         mode = SINGLE_LINE;
 661
 662       start = screen->line;
 663       column = screen->column;
 664     }
 665   else if (screen->num_lines > screen->line + 1)
 666     {
 667       struct line *next_linep;
 668
 669       next_linep = linep + 1;
 670       if (! ensure_space (linep, next_linep->len))
 671         return 0;
 672
 673       grub_memmove (linep->buf + linep->len, next_linep->buf, next_linep->len);
 674       linep->len += next_linep->len;
 675
 676       grub_free (next_linep->buf);
 677       grub_memmove (next_linep,
 678                     next_linep + 1,
 679                     (screen->num_lines - screen->line - 2)
 680                     * sizeof (struct line));
 681       screen->num_lines--;
 682
 683       mode = ALL_LINES;
 684       start = screen->line;
 685       column = screen->column;
 686       down = 1;
 687     }
 688
 689   screen->real_column = screen->column;
 690
 691   if (update)
 692     update_screen (screen, start, column, 0, down, mode);
 693
 694   return 1;
 695 }
 696
 697 static int
 698 backward_delete_char (struct screen *screen, int update)
 699 {
 700   int saved_column;
 701   int saved_line;
 702
 703   saved_column = screen->column;
 704   saved_line = screen->line;
 705
 706   if (! backward_char (screen, 0))
 707     return 0;
 708
 709   if (saved_column != screen->column || saved_line != screen->line)
 710     if (! delete_char (screen, update))
 711       return 0;
 712
 713   return 1;
 714 }
 715
 716 static int
 717 kill_line (struct screen *screen, int continuous, int update)
 718 {
 719   struct line *linep;
 720   char *p;
 721   int size;
 722   int offset;
 723
 724   p = screen->killed_text;
 725   if (! continuous && p)
 726     p[0] = '\0';
 727
 728   linep = screen->lines + screen->line;
 729   size = linep->len - screen->column;
 730
 731   if (p)
 732     offset = grub_strlen (p);
 733   else
 734     offset = 0;
 735
 736   if (size > 0)
 737     {
 738       enum update_mode mode = SINGLE_LINE;
 739       int down = 0;
 740       int orig_num, new_num;
 741
 742       p = grub_realloc (p, offset + size + 1);
 743       if (! p)
 744         return 0;
 745
 746       grub_memmove (p + offset, linep->buf + screen->column, size);
 747       p[offset + size - 1] = '\0';
 748
 749       screen->killed_text = p;
 750
 751       orig_num = get_logical_num_lines (linep);
 752       linep->len = screen->column;
 753       new_num = get_logical_num_lines (linep);
 754
 755       if (orig_num != new_num)
 756         {
 757           mode = ALL_LINES;
 758           down = 1;
 759         }
 760
 761       if (update)
 762         update_screen (screen, screen->line, screen->column, 0, down, mode);
 763     }
 764   else if (screen->line + 1 < screen->num_lines)
 765     {
 766       p = grub_realloc (p, offset + 1 + 1);
 767       if (! p)
 768         return 0;
 769
 770       p[offset] = '\n';
 771       p[offset + 1] = '\0';
 772
 773       screen->killed_text = p;
 774
 775       return delete_char (screen, update);
 776     }
 777
 778   return 1;
 779 }
 780
 781 static int
 782 yank (struct screen *screen, int update)
 783 {
 784   if (screen->killed_text)
 785     return insert_string (screen, screen->killed_text, update);
 786
 787   return 1;
 788 }
 789
 790 static int
 791 open_line (struct screen *screen, int update)
 792 {
 793   int saved_y = screen->y;
 794
 795   if (! insert_string (screen, "\n", 0))
 796     return 0;
 797
 798   if (! backward_char (screen, 0))
 799     return 0;
 800
 801   screen->y = saved_y;
 802
 803   if (update)
 804     update_screen (screen, screen->line, screen->column, 0, 1, ALL_LINES);
 805
 806   return 1;
 807 }
 808
 809 /* A completion hook to print items.  */
 810 static void
 811 store_completion (const char *item, grub_completion_type_t type, int count)
 812 {
 813   char *p;
 814
 815   if (count == 0)
 816     {
 817       /* If this is the first time, print a label.  */
 818       const char *what;
 819
 820       switch (type)
 821         {
 822         case GRUB_COMPLETION_TYPE_COMMAND:
 823           what = "commands";
 824           break;
 825         case GRUB_COMPLETION_TYPE_DEVICE:
 826           what = "devices";
 827           break;
 828         case GRUB_COMPLETION_TYPE_FILE:
 829           what = "files";
 830           break;
 831         case GRUB_COMPLETION_TYPE_PARTITION:
 832           what = "partitions";
 833           break;
 834         case GRUB_COMPLETION_TYPE_ARGUMENT:
 835           what = "arguments";
 836           break;
 837         default:
 838           what = "things";
 839           break;
 840         }
 841
 842       grub_gotoxy (0, GRUB_TERM_HEIGHT - 3);
 843       grub_printf ("   Possible %s are:\n    ", what);
 844     }
 845
 846   /* Make sure that the completion buffer has enough room.  */
 847   if (completion_buffer.max_len < (completion_buffer.len
 848                                    + (int) grub_strlen (item) + 1 + 1))
 849     {
 850       grub_size_t new_len;
 851
 852       new_len = completion_buffer.len + grub_strlen (item) + 80;
 853       p = grub_realloc (completion_buffer.buf, new_len);
 854       if (! p)
 855         {
 856           /* Possibly not fatal.  */
 857           grub_errno = GRUB_ERR_NONE;
 858           return;
 859         }
 860       p[completion_buffer.len] = 0;
 861       completion_buffer.buf = p;
 862       completion_buffer.max_len = new_len;
 863     }
 864
 865   p = completion_buffer.buf + completion_buffer.len;
 866   if (completion_buffer.len != 0)
 867     {
 868       *p++ = ' ';
 869       completion_buffer.len++;
 870     }
 871   grub_strcpy (p, item);
 872   completion_buffer.len += grub_strlen (item);
 873 }
 874
 875 static int
 876 complete (struct screen *screen, int continuous, int update)
 877 {
 878   grub_uint16_t pos;
 879   char saved_char;
 880   struct line *linep;
 881   int restore;
 882   char *insert;
 883   static int count = -1;
 884
 885   if (continuous)
 886     count++;
 887   else
 888     count = 0;
 889
 890   pos = grub_getxy ();
 891   grub_gotoxy (0, GRUB_TERM_HEIGHT - 3);
 892
 893   completion_buffer.buf = 0;
 894   completion_buffer.len = 0;
 895   completion_buffer.max_len = 0;
 896
 897   linep = screen->lines + screen->line;
 898   saved_char = linep->buf[screen->column];
 899   linep->buf[screen->column] = '\0';
 900
 901   insert = grub_normal_do_completion (linep->buf, &restore, store_completion);
 902
 903   linep->buf[screen->column] = saved_char;
 904
 905   if (restore)
 906     {
 907       char *p = completion_buffer.buf;
 908
 909       screen->completion_shown = 1;
 910
 911       if (p)
 912         {
 913           int num_sections = ((completion_buffer.len + GRUB_TERM_WIDTH - 8 - 1)
 914                               / (GRUB_TERM_WIDTH - 8));
 915           char *endp;
 916
 917           p += (count % num_sections) * (GRUB_TERM_WIDTH - 8);
 918           endp = p + (GRUB_TERM_WIDTH - 8);
 919
 920           if (p != completion_buffer.buf)
 921             grub_putcode (GRUB_TERM_DISP_LEFT);
 922           else
 923             grub_putchar (' ');
 924
 925           while (*p && p < endp)
 926             grub_putchar (*p++);
 927
 928           if (*p)
 929             grub_putcode (GRUB_TERM_DISP_RIGHT);
 930         }
 931     }
 932
 933   grub_gotoxy (pos >> 8, pos & 0xFF);
 934
 935   if (insert)
 936     {
 937       insert_string (screen, insert, update);
 938       count = -1;
 939       grub_free (insert);
 940     }
 941   else if (update)
 942     grub_refresh ();
 943
 944   grub_free (completion_buffer.buf);
 945   return 1;
 946 }
 947
 948 /* Clear displayed completions.  */
 949 static void
 950 clear_completions (void)
 951 {
 952   grub_uint16_t pos;
 953   int i, j;
 954
 955   pos = grub_getxy ();
 956   grub_gotoxy (0, GRUB_TERM_HEIGHT - 3);
 957
 958   for (i = 0; i < 2; i++)
 959     {
 960       for (j = 0; j < GRUB_TERM_WIDTH - 1; j++)
 961         grub_putchar (' ');
 962       grub_putchar ('\n');
 963     }
 964
 965   grub_gotoxy (pos >> 8, pos & 0xFF);
 966   grub_refresh ();
 967 }
 968
 969 /* Execute the command list in the screen SCREEN.  */
 970 static int
 971 run (struct screen *screen)
 972 {
 973   struct grub_script *parsed_script = 0;
 974   int currline = 0;
 975   char *nextline;
 976
 977   auto grub_err_t editor_getline (char **line);
 978   grub_err_t editor_getline (char **line)
 979     {
 980       struct line *linep = screen->lines + currline;
 981       char *p;
 982
 983       if (currline > screen->num_lines)
 984         {
 985           *line = 0;
 986           return 0;
 987         }
 988
 989       /* Trim down space characters.  */
 990       for (p = linep->buf + linep->len - 1;
 991            p >= linep->buf && grub_isspace (*p);
 992            p--)
 993         ;
 994       *++p = '\0';
 995
 996       linep->len = p - linep->buf;
 997       for (p = linep->buf; grub_isspace (*p); p++)
 998         ;
 999       *line = p;
1000       currline++;
1001       return 0;
1002     }
1003
1004   grub_cls ();
1005   grub_printf ("  Booting a command list\n\n");
1006
1007
1008   /* Execute the script, line for line.  */
1009   while (currline < screen->num_lines)
1010     {
1011       editor_getline (&nextline);
1012       parsed_script = grub_script_parse (nextline, editor_getline);
1013       if (parsed_script)
1014         {
1015           /* Execute the command(s).  */
1016           grub_script_execute (parsed_script);
1017
1018           /* The parsed script was executed, throw it away.  */
1019           grub_script_free (parsed_script);
1020         }
1021       else
1022         break;
1023     }
1024
1025   if (grub_errno == GRUB_ERR_NONE && grub_loader_is_loaded ())
1026     /* Implicit execution of boot, only if something is loaded.  */
1027     grub_command_execute ("boot", 0);
1028
1029   if (grub_errno != GRUB_ERR_NONE)
1030     {
1031       grub_print_error ();
1032       grub_errno = GRUB_ERR_NONE;
1033       /* Wait until the user pushes any key so that the user
1034          can see what happened.  */
1035       grub_printf ("\nPress any key to continue...");
1036       (void) grub_getkey ();
1037     }
1038
1039   return 1;
1040 }
1041
1042 /* Edit a menu entry with an Emacs-like interface.  */
1043 void
1044 grub_menu_entry_run (grub_menu_entry_t entry)
1045 {
1046   struct screen *screen;
1047   int prev_c;
1048
1049   screen = make_screen (entry);
1050   if (! screen)
1051     return;
1052
1053  refresh:
1054   /* Draw the screen.  */
1055   grub_menu_init_page (0, 1);
1056   update_screen (screen, 0, 0, 1, 1, ALL_LINES);
1057   grub_setcursor (1);
1058   prev_c = '\0';
1059
1060   while (1)
1061     {
1062       int c = GRUB_TERM_ASCII_CHAR (grub_getkey ());
1063
1064       if (screen->completion_shown)
1065         {
1066           clear_completions ();
1067           screen->completion_shown = 0;
1068         }
1069
1070       switch (c)
1071         {
1072         case 16: /* C-p */
1073           if (! previous_line (screen, 1))
1074             goto fail;
1075           break;
1076
1077         case 14: /* C-n */
1078           if (! next_line (screen, 1))
1079             goto fail;
1080           break;
1081
1082         case 6: /* C-f */
1083           if (! forward_char (screen, 1))
1084             goto fail;
1085           break;
1086
1087         case 2: /* C-b */
1088           if (! backward_char (screen, 1))
1089             goto fail;
1090           break;
1091
1092         case 1: /* C-a */
1093           if (! beginning_of_line (screen, 1))
1094             goto fail;
1095           break;
1096
1097         case 5: /* C-e */
1098           if (! end_of_line (screen, 1))
1099             goto fail;
1100           break;
1101
1102         case '\t': /* C-i */
1103           if (! complete (screen, prev_c == c, 1))
1104             goto fail;
1105           break;
1106
1107         case 4: /* C-d */
1108           if (! delete_char (screen, 1))
1109             goto fail;
1110           break;
1111
1112         case 8: /* C-h */
1113           if (! backward_delete_char (screen, 1))
1114             goto fail;
1115           break;
1116
1117         case 11: /* C-k */
1118           if (! kill_line (screen, prev_c == c, 1))
1119             goto fail;
1120           break;
1121
1122         case 21: /* C-u */
1123           /* FIXME: What behavior is good for this key?  */
1124           break;
1125
1126         case 25: /* C-y */
1127           if (! yank (screen, 1))
1128             goto fail;
1129           break;
1130
1131         case 12: /* C-l */
1132           /* FIXME: centering.  */
1133           goto refresh;
1134
1135         case 15: /* C-o */
1136           if (! open_line (screen, 1))
1137             goto fail;
1138           break;
1139
1140         case '\n':
1141         case '\r':
1142           if (! insert_string (screen, "\n", 1))
1143             goto fail;
1144           break;
1145
1146         case '\e':
1147           destroy_screen (screen);
1148           return;
1149
1150         case 3: /* C-c */
1151           grub_cmdline_run (1);
1152           goto refresh;
1153
1154         case 24: /* C-x */
1155           if (! run (screen))
1156             goto fail;
1157           goto refresh;
1158
1159         case 18: /* C-r */
1160         case 19: /* C-s */
1161         case 20: /* C-t */
1162           /* FIXME */
1163           break;
1164
1165         default:
1166           if (grub_isprint (c))
1167             {
1168               char buf[2];
1169
1170               buf[0] = c;
1171               buf[1] = '\0';
1172               if (! insert_string (screen, buf, 1))
1173                 goto fail;
1174             }
1175           break;
1176         }
1177
1178       prev_c = c;
1179     }
1180
1181  fail:
1182   destroy_screen (screen);
1183
1184   grub_cls ();
1185   grub_print_error ();
1186   grub_errno = GRUB_ERR_NONE;
1187   grub_printf ("\nPress any key to continue...");
1188   (void) grub_getkey ();
1189 }