src/editor/edit.c

   1 /*
   2    Editor low level data handling and cursor fundamentals.
   3
   4    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   5    2007, 2008, 2009, 2010, 2011
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Paul Sheer 1996, 1997
  10    Ilia Maslakov <il.smind@gmail.com> 2009, 2010, 2011
  11
  12    This file is part of the Midnight Commander.
  13
  14    The Midnight Commander is free software: you can redistribute it
  15    and/or modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation, either version 3 of the License,
  17    or (at your option) any later version.
  18
  19    The Midnight Commander is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 /** \file
  29  *  \brief Source: editor low level data handling and cursor fundamentals
  30  *  \author Paul Sheer
  31  *  \date 1996, 1997
  32  */
  33
  34 #include <config.h>
  35 #include <stdio.h>
  36 #include <stdarg.h>
  37 #include <sys/types.h>
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <ctype.h>
  41 #include <errno.h>
  42 #include <sys/stat.h>
  43 #include <stdlib.h>
  44 #include <fcntl.h>
  45
  46 #include "lib/global.h"
  47
  48 #include "lib/tty/color.h"
  49 #include "lib/tty/tty.h"        /* attrset() */
  50 #include "lib/tty/key.h"        /* is_idle() */
  51 #include "lib/skin.h"           /* EDITOR_NORMAL_COLOR */
  52 #include "lib/vfs/vfs.h"
  53 #include "lib/strutil.h"        /* utf string functions */
  54 #include "lib/util.h"           /* load_file_position(), save_file_position() */
  55 #include "lib/timefmt.h"        /* time formatting */
  56 #include "lib/lock.h"
  57 #include "lib/widget.h"
  58
  59 #ifdef HAVE_CHARSET
  60 #include "lib/charsets.h"       /* get_codepage_id */
  61 #endif
  62
  63 #include "src/filemanager/cmd.h"        /* view_other_cmd() */
  64 #include "src/filemanager/usermenu.h"   /* user_menu_cmd() */
  65
  66 #include "src/setup.h"          /* option_tab_spacing */
  67 #include "src/main.h"           /* macro_index */
  68 #include "src/learn.h"          /* learn_keys */
  69 #include "src/keybind-defaults.h"
  70
  71 #include "edit-impl.h"
  72 #include "edit-widget.h"
  73
  74 /*** global variables ****************************************************************************/
  75
  76 int option_word_wrap_line_length = DEFAULT_WRAP_LINE_LENGTH;
  77 int option_typewriter_wrap = 0;
  78 int option_auto_para_formatting = 0;
  79 int option_fill_tabs_with_spaces = 0;
  80 int option_return_does_auto_indent = 1;
  81 int option_backspace_through_tabs = 0;
  82 int option_fake_half_tabs = 1;
  83 int option_save_mode = EDIT_QUICK_SAVE;
  84 int option_save_position = 1;
  85 int option_max_undo = 32768;
  86 int option_persistent_selections = 1;
  87 int option_cursor_beyond_eol = 0;
  88 int option_line_state = 0;
  89 int option_line_state_width = 0;
  90
  91 int option_edit_right_extreme = 0;
  92 int option_edit_left_extreme = 0;
  93 int option_edit_top_extreme = 0;
  94 int option_edit_bottom_extreme = 0;
  95 int enable_show_tabs_tws = 1;
  96 int option_check_nl_at_eof = 0;
  97 int option_group_undo = 0;
  98 int show_right_margin = 0;
  99
 100 const char *option_whole_chars_search = "0123456789abcdefghijklmnopqrstuvwxyz_";
 101 char *option_backup_ext = NULL;
 102
 103 int edit_stack_iterator = 0;
 104 edit_stack_type edit_history_moveto[MAX_HISTORY_MOVETO];
 105 /* magic sequense for say than block is vertical */
 106 const char VERTICAL_MAGIC[] = { '\1', '\1', '\1', '\1', '\n' };
 107
 108 /*** file scope macro definitions ****************************************************************/
 109
 110 #define TEMP_BUF_LEN 1024
 111
 112 #define space_width 1
 113
 114 /*** file scope type declarations ****************************************************************/
 115
 116 /*** file scope variables ************************************************************************/
 117
 118 /* detecting an error on save is easy: just check if every byte has been written. */
 119 /* detecting an error on read, is not so easy 'cos there is not way to tell
 120    whether you read everything or not. */
 121 /* FIXME: add proper `triple_pipe_open' to read, write and check errors. */
 122 static const struct edit_filters
 123 {
 124     const char *read, *write, *extension;
 125 } all_filters[] =
 126 {
 127     /* *INDENT-OFF* */
 128     { "xz -cd %s 2>&1", "xz > %s", ".xz"},
 129     { "lzma -cd %s 2>&1", "lzma > %s", ".lzma" },
 130     { "bzip2 -cd %s 2>&1", "bzip2 > %s", ".bz2" },
 131     { "gzip -cd %s 2>&1", "gzip > %s", ".gz" },
 132     { "gzip -cd %s 2>&1", "gzip > %s", ".Z" }
 133     /* *INDENT-ON* */
 134 };
 135
 136 static long last_bracket = -1;
 137
 138 /*** file scope functions ************************************************************************/
 139 /* --------------------------------------------------------------------------------------------- */
 140
 141 /*-
 142  *
 143  * here's a quick sketch of the layout: (don't run this through indent.)
 144  *
 145  * (b1 is buffers1 and b2 is buffers2)
 146  *
 147  *                                       |
 148  * \0\0\0\0\0m e _ f i l e . \nf i n . \n|T h i s _ i s _ s o\0\0\0\0\0\0\0\0\0
 149  * ______________________________________|______________________________________
 150  *                                       |
 151  * ...  |  b2[2]   |  b2[1]   |  b2[0]   |  b1[0]   |  b1[1]   |  b1[2]   | ...
 152  *      |->        |->        |->        |->        |->        |->        |
 153  *                                       |
 154  *           _<------------------------->|<----------------->_
 155  *                   WEdit->curs2        |   WEdit->curs1
 156  *           ^                           |                   ^
 157  *           |                          ^|^                  |
 158  *         cursor                       |||                cursor
 159  *                                      |||
 160  *                              file end|||file beginning
 161  *                                       |
 162  *                                       |
 163  *
 164  *           _
 165  * This_is_some_file
 166  * fin.
 167  */
 168
 169 /* --------------------------------------------------------------------------------------------- */
 170
 171 static int left_of_four_spaces (WEdit * edit);
 172
 173 /* --------------------------------------------------------------------------------------------- */
 174
 175 static void
 176 edit_about (void)
 177 {
 178     const char *header = N_("About");
 179     const char *button_name = N_("&OK");
 180     const char *const version = "MCEdit " VERSION;
 181     char text[BUF_LARGE];
 182
 183     int win_len, version_len, button_len;
 184     int cols, lines;
 185
 186     Dlg_head *about_dlg;
 187
 188 #ifdef ENABLE_NLS
 189     header = _(header);
 190     button_name = _(button_name);
 191 #endif
 192
 193     button_len = str_term_width1 (button_name) + 5;
 194     version_len = str_term_width1 (version);
 195
 196     g_snprintf (text, sizeof (text),
 197                 _("Copyright (C) 1996-2010 the Free Software Foundation\n\n"
 198                   "            A user friendly text editor\n"
 199                   "         written for the Midnight Commander"));
 200
 201     win_len = str_term_width1 (header);
 202     win_len = max (win_len, version_len);
 203     win_len = max (win_len, button_len);
 204
 205     /* count width and height of text */
 206     str_msg_term_size (text, &lines, &cols);
 207     lines += 9;
 208     cols = max (win_len, cols) + 6;
 209
 210     /* dialog */
 211     about_dlg = create_dlg (TRUE, 0, 0, lines, cols, dialog_colors, NULL,
 212                             "[Internal File Editor]", header, DLG_CENTER | DLG_TRYUP);
 213
 214     add_widget (about_dlg, label_new (3, (cols - version_len) / 2, version));
 215     add_widget (about_dlg, label_new (5, 3, text));
 216     add_widget (about_dlg, button_new (lines - 3, (cols - button_len) / 2,
 217                                        B_ENTER, NORMAL_BUTTON, button_name, NULL));
 218
 219     run_dlg (about_dlg);
 220     destroy_dlg (about_dlg);
 221 }
 222
 223 /* --------------------------------------------------------------------------------------------- */
 224 /**
 225  * Initialize the buffers for an empty files.
 226  */
 227
 228 static void
 229 edit_init_buffers (WEdit * edit)
 230 {
 231     int j;
 232
 233     for (j = 0; j <= MAXBUFF; j++)
 234     {
 235         edit->buffers1[j] = NULL;
 236         edit->buffers2[j] = NULL;
 237     }
 238
 239     edit->curs1 = 0;
 240     edit->curs2 = 0;
 241     edit->buffers2[0] = g_malloc0 (EDIT_BUF_SIZE);
 242 }
 243
 244 /* --------------------------------------------------------------------------------------------- */
 245 /**
 246  * Load file OR text into buffers.  Set cursor to the beginning of file.
 247  * @returns 1 on error.
 248  */
 249
 250 static int
 251 edit_load_file_fast (WEdit * edit, const char *filename)
 252 {
 253     long buf, buf2;
 254     int file = -1;
 255     int ret = 1;
 256     vfs_path_t *vpath;
 257
 258     edit->curs2 = edit->last_byte;
 259     buf2 = edit->curs2 >> S_EDIT_BUF_SIZE;
 260
 261     vpath = vfs_path_from_str (filename);
 262     file = mc_open (vpath, O_RDONLY | O_BINARY);
 263     vfs_path_free (vpath);
 264     if (file == -1)
 265     {
 266         gchar *errmsg;
 267
 268         errmsg = g_strdup_printf (_("Cannot open %s for reading"), filename);
 269         edit_error_dialog (_("Error"), errmsg);
 270         g_free (errmsg);
 271         return 1;
 272     }
 273
 274     if (!edit->buffers2[buf2])
 275         edit->buffers2[buf2] = g_malloc0 (EDIT_BUF_SIZE);
 276
 277     do
 278     {
 279         if (mc_read (file,
 280                      (char *) edit->buffers2[buf2] + EDIT_BUF_SIZE -
 281                      (edit->curs2 & M_EDIT_BUF_SIZE), edit->curs2 & M_EDIT_BUF_SIZE) < 0)
 282             break;
 283
 284         for (buf = buf2 - 1; buf >= 0; buf--)
 285         {
 286             /* edit->buffers2[0] is already allocated */
 287             if (!edit->buffers2[buf])
 288                 edit->buffers2[buf] = g_malloc0 (EDIT_BUF_SIZE);
 289             if (mc_read (file, (char *) edit->buffers2[buf], EDIT_BUF_SIZE) < 0)
 290                 break;
 291         }
 292         ret = 0;
 293     }
 294     while (0);
 295     if (ret)
 296     {
 297         char *err_str = g_strdup_printf (_("Error reading %s"), filename);
 298         edit_error_dialog (_("Error"), err_str);
 299         g_free (err_str);
 300     }
 301     mc_close (file);
 302     return ret;
 303 }
 304
 305 /* --------------------------------------------------------------------------------------------- */
 306 /** Return index of the filter or -1 is there is no appropriate filter */
 307
 308 static int
 309 edit_find_filter (const char *filename)
 310 {
 311     size_t i, l, e;
 312
 313     if (filename == NULL)
 314         return -1;
 315
 316     l = strlen (filename);
 317     for (i = 0; i < sizeof (all_filters) / sizeof (all_filters[0]); i++)
 318     {
 319         e = strlen (all_filters[i].extension);
 320         if (l > e)
 321             if (!strcmp (all_filters[i].extension, filename + l - e))
 322                 return i;
 323     }
 324     return -1;
 325 }
 326
 327 /* --------------------------------------------------------------------------------------------- */
 328
 329 static char *
 330 edit_get_filter (const char *filename)
 331 {
 332     int i;
 333     char *p, *quoted_name;
 334
 335     i = edit_find_filter (filename);
 336     if (i < 0)
 337         return NULL;
 338
 339     quoted_name = name_quote (filename, 0);
 340     p = g_strdup_printf (all_filters[i].read, quoted_name);
 341     g_free (quoted_name);
 342     return p;
 343 }
 344
 345 /* --------------------------------------------------------------------------------------------- */
 346
 347 static long
 348 edit_insert_stream (WEdit * edit, FILE * f)
 349 {
 350     int c;
 351     long i = 0;
 352     while ((c = fgetc (f)) >= 0)
 353     {
 354         edit_insert (edit, c);
 355         i++;
 356     }
 357     return i;
 358 }
 359
 360 /* --------------------------------------------------------------------------------------------- */
 361 /** Open file and create it if necessary.  Return 0 for success, 1 for error.  */
 362
 363 static int
 364 check_file_access (WEdit * edit, const char *filename, struct stat *st)
 365 {
 366     int file;
 367     gchar *errmsg = NULL;
 368     vfs_path_t *vpath;
 369
 370     /* Try opening an existing file */
 371     vpath = vfs_path_from_str (filename);
 372     file = mc_open (vpath, O_NONBLOCK | O_RDONLY | O_BINARY, 0666);
 373
 374     if (file < 0)
 375     {
 376         /*
 377          * Try creating the file. O_EXCL prevents following broken links
 378          * and opening existing files.
 379          */
 380         file = mc_open (vpath, O_NONBLOCK | O_RDONLY | O_BINARY | O_CREAT | O_EXCL, 0666);
 381         if (file < 0)
 382         {
 383             errmsg = g_strdup_printf (_("Cannot open %s for reading"), filename);
 384             goto cleanup;
 385         }
 386         else
 387         {
 388             /* New file, delete it if it's not modified or saved */
 389             edit->delete_file = 1;
 390         }
 391     }
 392
 393     /* Check what we have opened */
 394     if (mc_fstat (file, st) < 0)
 395     {
 396         errmsg = g_strdup_printf (_("Cannot get size/permissions for %s"), filename);
 397         goto cleanup;
 398     }
 399
 400     /* We want to open regular files only */
 401     if (!S_ISREG (st->st_mode))
 402     {
 403         errmsg = g_strdup_printf (_("\"%s\" is not a regular file"), filename);
 404         goto cleanup;
 405     }
 406
 407     /*
 408      * Don't delete non-empty files.
 409      * O_EXCL should prevent it, but let's be on the safe side.
 410      */
 411     if (st->st_size > 0)
 412         edit->delete_file = 0;
 413
 414     if (st->st_size >= SIZE_LIMIT)
 415         errmsg = g_strdup_printf (_("File \"%s\" is too large"), filename);
 416
 417   cleanup:
 418     (void) mc_close (file);
 419     vfs_path_free (vpath);
 420
 421     if (errmsg != NULL)
 422     {
 423         edit_error_dialog (_("Error"), errmsg);
 424         g_free (errmsg);
 425         return 1;
 426     }
 427     return 0;
 428 }
 429
 430 /* --------------------------------------------------------------------------------------------- */
 431 /**
 432  * Open the file and load it into the buffers, either directly or using
 433  * a filter.  Return 0 on success, 1 on error.
 434  *
 435  * Fast loading (edit_load_file_fast) is used when the file size is
 436  * known.  In this case the data is read into the buffers by blocks.
 437  * If the file size is not known, the data is loaded byte by byte in
 438  * edit_insert_file.
 439  */
 440
 441 static int
 442 edit_load_file (WEdit * edit)
 443 {
 444     int fast_load = 1;
 445     vfs_path_t *vpath = vfs_path_from_str (edit->filename);
 446
 447     /* Cannot do fast load if a filter is used */
 448     if (edit_find_filter (edit->filename) >= 0)
 449         fast_load = 0;
 450
 451     /*
 452      * VFS may report file size incorrectly, and slow load is not a big
 453      * deal considering overhead in VFS.
 454      */
 455     if (!vfs_file_is_local (vpath))
 456         fast_load = 0;
 457     vfs_path_free (vpath);
 458
 459     /*
 460      * FIXME: line end translation should disable fast loading as well
 461      * Consider doing fseek() to the end and ftell() for the real size.
 462      */
 463
 464     if (*edit->filename)
 465     {
 466         /* If we are dealing with a real file, check that it exists */
 467         if (check_file_access (edit, edit->filename, &edit->stat1))
 468             return 1;
 469     }
 470     else
 471     {
 472         /* nothing to load */
 473         fast_load = 0;
 474     }
 475
 476     edit_init_buffers (edit);
 477
 478     if (fast_load)
 479     {
 480         edit->last_byte = edit->stat1.st_size;
 481         edit_load_file_fast (edit, edit->filename);
 482         /* If fast load was used, the number of lines wasn't calculated */
 483         edit->total_lines = edit_count_lines (edit, 0, edit->last_byte);
 484     }
 485     else
 486     {
 487         edit->last_byte = 0;
 488         if (*edit->filename)
 489         {
 490             edit->undo_stack_disable = 1;
 491             if (edit_insert_file (edit, edit->filename) < 0)
 492             {
 493                 edit_clean (edit);
 494                 return 1;
 495             }
 496             edit->undo_stack_disable = 0;
 497         }
 498     }
 499     edit->lb = LB_ASIS;
 500     return 0;
 501 }
 502
 503 /* --------------------------------------------------------------------------------------------- */
 504 /** Restore saved cursor position in the file */
 505
 506 static void
 507 edit_load_position (WEdit * edit)
 508 {
 509     char *filename;
 510     long line, column;
 511     off_t offset;
 512     vfs_path_t *vpath;
 513
 514     if (!edit->filename || !*edit->filename)
 515         return;
 516
 517     vpath = vfs_path_from_str (edit->filename);
 518     filename = vfs_path_to_str (vpath);
 519     load_file_position (filename, &line, &column, &offset, &edit->serialized_bookmarks);
 520     vfs_path_free (vpath);
 521     g_free (filename);
 522
 523     if (line > 0)
 524     {
 525         edit_move_to_line (edit, line - 1);
 526         edit->prev_col = column;
 527     }
 528     else if (offset > 0)
 529     {
 530         edit_cursor_move (edit, offset);
 531         line = edit->curs_line;
 532         edit->search_start = edit->curs1;
 533     }
 534
 535     book_mark_restore (edit, BOOK_MARK_COLOR);
 536
 537     edit_move_to_prev_col (edit, edit_bol (edit, edit->curs1));
 538     edit_move_display (edit, line - (edit->widget.lines / 2));
 539 }
 540
 541 /* --------------------------------------------------------------------------------------------- */
 542 /** Save cursor position in the file */
 543
 544 static void
 545 edit_save_position (WEdit * edit)
 546 {
 547     char *filename;
 548     vfs_path_t *vpath;
 549
 550     if (edit->filename == NULL || *edit->filename == '\0')
 551         return;
 552
 553     vpath = vfs_path_from_str (edit->filename);
 554     filename = vfs_path_to_str (vpath);
 555
 556     book_mark_serialize (edit, BOOK_MARK_COLOR);
 557     save_file_position (filename, edit->curs_line + 1, edit->curs_col, edit->curs1,
 558                         edit->serialized_bookmarks);
 559     edit->serialized_bookmarks = NULL;
 560
 561     g_free (filename);
 562     vfs_path_free (vpath);
 563 }
 564
 565 /* --------------------------------------------------------------------------------------------- */
 566 /** Clean the WEdit stricture except the widget part */
 567
 568 static void
 569 edit_purge_widget (WEdit * edit)
 570 {
 571     size_t len = sizeof (WEdit) - sizeof (Widget);
 572     char *start = (char *) edit + sizeof (Widget);
 573     memset (start, 0, len);
 574 }
 575
 576 /* --------------------------------------------------------------------------------------------- */
 577
 578 /*
 579    TODO: if the user undos until the stack bottom, and the stack has not wrapped,
 580    then the file should be as it was when he loaded up. Then set edit->modified to 0.
 581  */
 582
 583 static long
 584 edit_pop_undo_action (WEdit * edit)
 585 {
 586     long c;
 587     unsigned long sp = edit->undo_stack_pointer;
 588
 589     if (sp == edit->undo_stack_bottom)
 590         return STACK_BOTTOM;
 591
 592     sp = (sp - 1) & edit->undo_stack_size_mask;
 593     c = edit->undo_stack[sp];
 594     if (c >= 0)
 595     {
 596         /*      edit->undo_stack[sp] = '@'; */
 597         edit->undo_stack_pointer = (edit->undo_stack_pointer - 1) & edit->undo_stack_size_mask;
 598         return c;
 599     }
 600
 601     if (sp == edit->undo_stack_bottom)
 602         return STACK_BOTTOM;
 603
 604     c = edit->undo_stack[(sp - 1) & edit->undo_stack_size_mask];
 605     if (edit->undo_stack[sp] == -2)
 606     {
 607         /*      edit->undo_stack[sp] = '@'; */
 608         edit->undo_stack_pointer = sp;
 609     }
 610     else
 611         edit->undo_stack[sp]++;
 612
 613     return c;
 614 }
 615
 616 static long
 617 edit_pop_redo_action (WEdit * edit)
 618 {
 619     long c;
 620     unsigned long sp = edit->redo_stack_pointer;
 621
 622     if (sp == edit->redo_stack_bottom)
 623         return STACK_BOTTOM;
 624
 625     sp = (sp - 1) & edit->redo_stack_size_mask;
 626     c = edit->redo_stack[sp];
 627     if (c >= 0)
 628     {
 629         edit->redo_stack_pointer = (edit->redo_stack_pointer - 1) & edit->redo_stack_size_mask;
 630         return c;
 631     }
 632
 633     if (sp == edit->redo_stack_bottom)
 634         return STACK_BOTTOM;
 635
 636     c = edit->redo_stack[(sp - 1) & edit->redo_stack_size_mask];
 637     if (edit->redo_stack[sp] == -2)
 638         edit->redo_stack_pointer = sp;
 639     else
 640         edit->redo_stack[sp]++;
 641
 642     return c;
 643 }
 644
 645 static long
 646 get_prev_undo_action (WEdit * edit)
 647 {
 648     long c;
 649     unsigned long sp = edit->undo_stack_pointer;
 650
 651     if (sp == edit->undo_stack_bottom)
 652         return STACK_BOTTOM;
 653
 654     sp = (sp - 1) & edit->undo_stack_size_mask;
 655     c = edit->undo_stack[sp];
 656     if (c >= 0)
 657         return c;
 658
 659     if (sp == edit->undo_stack_bottom)
 660         return STACK_BOTTOM;
 661
 662     c = edit->undo_stack[(sp - 1) & edit->undo_stack_size_mask];
 663     return c;
 664 }
 665
 666 /* --------------------------------------------------------------------------------------------- */
 667 /** is called whenever a modification is made by one of the four routines below */
 668
 669 static void
 670 edit_modification (WEdit * edit)
 671 {
 672     edit->caches_valid = 0;
 673
 674     /* raise lock when file modified */
 675     if (!edit->modified && !edit->delete_file)
 676         edit->locked = edit_lock_file (edit);
 677     edit->modified = 1;
 678 }
 679
 680 /* --------------------------------------------------------------------------------------------- */
 681
 682 static char *
 683 edit_get_byte_ptr (WEdit * edit, long byte_index)
 684 {
 685     if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
 686         return NULL;
 687
 688     if (byte_index >= edit->curs1)
 689     {
 690         unsigned long p;
 691
 692         p = edit->curs1 + edit->curs2 - byte_index - 1;
 693         return (char *) (edit->buffers2[p >> S_EDIT_BUF_SIZE] +
 694                          (EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1));
 695     }
 696
 697     return (char *) (edit->buffers1[byte_index >> S_EDIT_BUF_SIZE] +
 698                      (byte_index & M_EDIT_BUF_SIZE));
 699 }
 700
 701 /* --------------------------------------------------------------------------------------------- */
 702
 703 static int
 704 edit_get_prev_utf (WEdit * edit, long byte_index, int *char_width)
 705 {
 706     int i, res;
 707     gchar utf8_buf[3 * UTF8_CHAR_LEN + 1];
 708     gchar *str;
 709     gchar *cursor_buf_ptr;
 710
 711     if (byte_index > (edit->curs1 + edit->curs2) || byte_index <= 0)
 712     {
 713         *char_width = 0;
 714         return 0;
 715     }
 716
 717     for (i = 0; i < (3 * UTF8_CHAR_LEN); i++)
 718         utf8_buf[i] = edit_get_byte (edit, byte_index + i - (2 * UTF8_CHAR_LEN));
 719     utf8_buf[3 * UTF8_CHAR_LEN] = '\0';
 720
 721     cursor_buf_ptr = utf8_buf + (2 * UTF8_CHAR_LEN);
 722     str = g_utf8_find_prev_char (utf8_buf, cursor_buf_ptr);
 723
 724     if (str == NULL || g_utf8_next_char (str) != cursor_buf_ptr)
 725     {
 726         *char_width = 1;
 727         return *(cursor_buf_ptr - 1);
 728     }
 729     else
 730     {
 731         res = g_utf8_get_char_validated (str, -1);
 732
 733         if (res < 0)
 734         {
 735             *char_width = 1;
 736             return *(cursor_buf_ptr - 1);
 737         }
 738         else
 739         {
 740             *char_width = cursor_buf_ptr - str;
 741             return res;
 742         }
 743     }
 744 }
 745
 746 /* --------------------------------------------------------------------------------------------- */
 747
 748 static int
 749 edit_backspace (WEdit * edit, const int byte_delete)
 750 {
 751     int p = 0;
 752     int cw = 1;
 753     int i;
 754
 755     if (!edit->curs1)
 756         return 0;
 757
 758     cw = 1;
 759
 760     if (edit->mark2 != edit->mark1)
 761         edit_push_markers (edit);
 762
 763     if (edit->utf8 && byte_delete == 0)
 764     {
 765         edit_get_prev_utf (edit, edit->curs1, &cw);
 766         if (cw < 1)
 767             cw = 1;
 768     }
 769     for (i = 1; i <= cw; i++)
 770     {
 771         if (edit->mark1 >= edit->curs1)
 772         {
 773             edit->mark1--;
 774             edit->end_mark_curs--;
 775         }
 776         if (edit->mark2 >= edit->curs1)
 777             edit->mark2--;
 778         if (edit->last_get_rule >= edit->curs1)
 779             edit->last_get_rule--;
 780
 781         p = *(edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE] +
 782               ((edit->curs1 - 1) & M_EDIT_BUF_SIZE));
 783         if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE))
 784         {
 785             g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
 786             edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
 787         }
 788         edit->last_byte--;
 789         edit->curs1--;
 790         edit_push_undo_action (edit, p);
 791     }
 792     edit_modification (edit);
 793     if (p == '\n')
 794     {
 795         if (edit->book_mark)
 796             book_mark_dec (edit, edit->curs_line);
 797         edit->curs_line--;
 798         edit->total_lines--;
 799         edit->force |= REDRAW_AFTER_CURSOR;
 800     }
 801
 802     if (edit->curs1 < edit->start_display)
 803     {
 804         edit->start_display--;
 805         if (p == '\n')
 806             edit->start_line--;
 807     }
 808
 809     return p;
 810 }
 811
 812 /* --------------------------------------------------------------------------------------------- */
 813 /* high level cursor movement commands */
 814 /* --------------------------------------------------------------------------------------------- */
 815
 816 static int
 817 is_in_indent (WEdit * edit)
 818 {
 819     long p = edit_bol (edit, edit->curs1);
 820     while (p < edit->curs1)
 821         if (!strchr (" \t", edit_get_byte (edit, p++)))
 822             return 0;
 823     return 1;
 824 }
 825
 826 /* --------------------------------------------------------------------------------------------- */
 827
 828 static int
 829 is_blank (WEdit * edit, long offset)
 830 {
 831     long s, f;
 832     int c;
 833     s = edit_bol (edit, offset);
 834     f = edit_eol (edit, offset) - 1;
 835     while (s <= f)
 836     {
 837         c = edit_get_byte (edit, s++);
 838         if (!isspace (c))
 839             return 0;
 840     }
 841     return 1;
 842 }
 843
 844
 845 /* --------------------------------------------------------------------------------------------- */
 846 /** returns the offset of line i */
 847
 848 static long
 849 edit_find_line (WEdit * edit, int line)
 850 {
 851     int i, j = 0;
 852     int m = 2000000000;
 853     if (!edit->caches_valid)
 854     {
 855         for (i = 0; i < N_LINE_CACHES; i++)
 856             edit->line_numbers[i] = edit->line_offsets[i] = 0;
 857         /* three offsets that we *know* are line 0 at 0 and these two: */
 858         edit->line_numbers[1] = edit->curs_line;
 859         edit->line_offsets[1] = edit_bol (edit, edit->curs1);
 860         edit->line_numbers[2] = edit->total_lines;
 861         edit->line_offsets[2] = edit_bol (edit, edit->last_byte);
 862         edit->caches_valid = 1;
 863     }
 864     if (line >= edit->total_lines)
 865         return edit->line_offsets[2];
 866     if (line <= 0)
 867         return 0;
 868     /* find the closest known point */
 869     for (i = 0; i < N_LINE_CACHES; i++)
 870     {
 871         int n;
 872         n = abs (edit->line_numbers[i] - line);
 873         if (n < m)
 874         {
 875             m = n;
 876             j = i;
 877         }
 878     }
 879     if (m == 0)
 880         return edit->line_offsets[j];   /* know the offset exactly */
 881     if (m == 1 && j >= 3)
 882         i = j;                  /* one line different - caller might be looping, so stay in this cache */
 883     else
 884         i = 3 + (rand () % (N_LINE_CACHES - 3));
 885     if (line > edit->line_numbers[j])
 886         edit->line_offsets[i] =
 887             edit_move_forward (edit, edit->line_offsets[j], line - edit->line_numbers[j], 0);
 888     else
 889         edit->line_offsets[i] =
 890             edit_move_backward (edit, edit->line_offsets[j], edit->line_numbers[j] - line);
 891     edit->line_numbers[i] = line;
 892     return edit->line_offsets[i];
 893 }
 894
 895 /* --------------------------------------------------------------------------------------------- */
 896 /** moves up until a blank line is reached, or until just
 897    before a non-blank line is reached */
 898
 899 static void
 900 edit_move_up_paragraph (WEdit * edit, int do_scroll)
 901 {
 902     int i = 0;
 903     if (edit->curs_line > 1)
 904     {
 905         if (line_is_blank (edit, edit->curs_line))
 906         {
 907             if (line_is_blank (edit, edit->curs_line - 1))
 908             {
 909                 for (i = edit->curs_line - 1; i; i--)
 910                     if (!line_is_blank (edit, i))
 911                     {
 912                         i++;
 913                         break;
 914                     }
 915             }
 916             else
 917             {
 918                 for (i = edit->curs_line - 1; i; i--)
 919                     if (line_is_blank (edit, i))
 920                         break;
 921             }
 922         }
 923         else
 924         {
 925             for (i = edit->curs_line - 1; i; i--)
 926                 if (line_is_blank (edit, i))
 927                     break;
 928         }
 929     }
 930     edit_move_up (edit, edit->curs_line - i, do_scroll);
 931 }
 932
 933 /* --------------------------------------------------------------------------------------------- */
 934 /** moves down until a blank line is reached, or until just
 935    before a non-blank line is reached */
 936
 937 static void
 938 edit_move_down_paragraph (WEdit * edit, int do_scroll)
 939 {
 940     int i;
 941     if (edit->curs_line >= edit->total_lines - 1)
 942     {
 943         i = edit->total_lines;
 944     }
 945     else
 946     {
 947         if (line_is_blank (edit, edit->curs_line))
 948         {
 949             if (line_is_blank (edit, edit->curs_line + 1))
 950             {
 951                 for (i = edit->curs_line + 1; i; i++)
 952                     if (!line_is_blank (edit, i) || i > edit->total_lines)
 953                     {
 954                         i--;
 955                         break;
 956                     }
 957             }
 958             else
 959             {
 960                 for (i = edit->curs_line + 1; i; i++)
 961                     if (line_is_blank (edit, i) || i >= edit->total_lines)
 962                         break;
 963             }
 964         }
 965         else
 966         {
 967             for (i = edit->curs_line + 1; i; i++)
 968                 if (line_is_blank (edit, i) || i >= edit->total_lines)
 969                     break;
 970         }
 971     }
 972     edit_move_down (edit, i - edit->curs_line, do_scroll);
 973 }
 974
 975 /* --------------------------------------------------------------------------------------------- */
 976
 977 static void
 978 edit_begin_page (WEdit * edit)
 979 {
 980     edit_update_curs_row (edit);
 981     edit_move_up (edit, edit->curs_row, 0);
 982 }
 983
 984 /* --------------------------------------------------------------------------------------------- */
 985
 986 static void
 987 edit_end_page (WEdit * edit)
 988 {
 989     edit_update_curs_row (edit);
 990     edit_move_down (edit, edit->widget.lines - edit->curs_row - 1, 0);
 991 }
 992
 993
 994 /* --------------------------------------------------------------------------------------------- */
 995 /** goto beginning of text */
 996
 997 static void
 998 edit_move_to_top (WEdit * edit)
 999 {
1000     if (edit->curs_line)
1001     {
1002         edit_cursor_move (edit, -edit->curs1);
1003         edit_move_to_prev_col (edit, 0);
1004         edit->force |= REDRAW_PAGE;
1005         edit->search_start = 0;
1006         edit_update_curs_row (edit);
1007     }
1008 }
1009
1010
1011 /* --------------------------------------------------------------------------------------------- */
1012 /** goto end of text */
1013
1014 static void
1015 edit_move_to_bottom (WEdit * edit)
1016 {
1017     if (edit->curs_line < edit->total_lines)
1018     {
1019         edit_move_down (edit, edit->total_lines - edit->curs_row, 0);
1020         edit->start_display = edit->last_byte;
1021         edit->start_line = edit->total_lines;
1022         edit_scroll_upward (edit, edit->widget.lines - 1);
1023         edit->force |= REDRAW_PAGE;
1024     }
1025 }
1026
1027 /* --------------------------------------------------------------------------------------------- */
1028 /** goto beginning of line */
1029
1030 static void
1031 edit_cursor_to_bol (WEdit * edit)
1032 {
1033     edit_cursor_move (edit, edit_bol (edit, edit->curs1) - edit->curs1);
1034     edit->search_start = edit->curs1;
1035     edit->prev_col = edit_get_col (edit);
1036     edit->over_col = 0;
1037 }
1038
1039 /* --------------------------------------------------------------------------------------------- */
1040 /** goto end of line */
1041
1042 static void
1043 edit_cursor_to_eol (WEdit * edit)
1044 {
1045     edit_cursor_move (edit, edit_eol (edit, edit->curs1) - edit->curs1);
1046     edit->search_start = edit->curs1;
1047     edit->prev_col = edit_get_col (edit);
1048     edit->over_col = 0;
1049 }
1050
1051 /* --------------------------------------------------------------------------------------------- */
1052
1053 static unsigned long
1054 my_type_of (int c)
1055 {
1056     int x, r = 0;
1057     const char *p, *q;
1058     const char option_chars_move_whole_word[] =
1059         "!=&|<>^~ !:;, !'!`!.?!\"!( !) !{ !} !Aa0 !+-*/= |<> ![ !] !\\#! ";
1060
1061     if (!c)
1062         return 0;
1063     if (c == '!')
1064     {
1065         if (*option_chars_move_whole_word == '!')
1066             return 2;
1067         return 0x80000000UL;
1068     }
1069     if (g_ascii_isupper ((gchar) c))
1070         c = 'A';
1071     else if (g_ascii_islower ((gchar) c))
1072         c = 'a';
1073     else if (g_ascii_isalpha (c))
1074         c = 'a';
1075     else if (isdigit (c))
1076         c = '0';
1077     else if (isspace (c))
1078         c = ' ';
1079     q = strchr (option_chars_move_whole_word, c);
1080     if (!q)
1081         return 0xFFFFFFFFUL;
1082     do
1083     {
1084         for (x = 1, p = option_chars_move_whole_word; p < q; p++)
1085             if (*p == '!')
1086                 x <<= 1;
1087         r |= x;
1088     }
1089     while ((q = strchr (q + 1, c)));
1090     return r;
1091 }
1092
1093 /* --------------------------------------------------------------------------------------------- */
1094
1095 static void
1096 edit_left_word_move (WEdit * edit, int s)
1097 {
1098     for (;;)
1099     {
1100         int c1, c2;
1101         if (edit->column_highlight
1102             && edit->mark1 != edit->mark2
1103             && edit->over_col == 0 && edit->curs1 == edit_bol (edit, edit->curs1))
1104             break;
1105         edit_cursor_move (edit, -1);
1106         if (!edit->curs1)
1107             break;
1108         c1 = edit_get_byte (edit, edit->curs1 - 1);
1109         c2 = edit_get_byte (edit, edit->curs1);
1110         if (c1 == '\n' || c2 == '\n')
1111             break;
1112         if (!(my_type_of (c1) & my_type_of (c2)))
1113             break;
1114         if (isspace (c1) && !isspace (c2))
1115             break;
1116         if (s)
1117             if (!isspace (c1) && isspace (c2))
1118                 break;
1119     }
1120 }
1121
1122 /* --------------------------------------------------------------------------------------------- */
1123
1124 static void
1125 edit_left_word_move_cmd (WEdit * edit)
1126 {
1127     edit_left_word_move (edit, 0);
1128     edit->force |= REDRAW_PAGE;
1129 }
1130
1131 /* --------------------------------------------------------------------------------------------- */
1132
1133 static void
1134 edit_right_word_move (WEdit * edit, int s)
1135 {
1136     for (;;)
1137     {
1138         int c1, c2;
1139         if (edit->column_highlight
1140             && edit->mark1 != edit->mark2
1141             && edit->over_col == 0 && edit->curs1 == edit_eol (edit, edit->curs1))
1142             break;
1143         edit_cursor_move (edit, 1);
1144         if (edit->curs1 >= edit->last_byte)
1145             break;
1146         c1 = edit_get_byte (edit, edit->curs1 - 1);
1147         c2 = edit_get_byte (edit, edit->curs1);
1148         if (c1 == '\n' || c2 == '\n')
1149             break;
1150         if (!(my_type_of (c1) & my_type_of (c2)))
1151             break;
1152         if (isspace (c1) && !isspace (c2))
1153             break;
1154         if (s)
1155             if (!isspace (c1) && isspace (c2))
1156                 break;
1157     }
1158 }
1159
1160 /* --------------------------------------------------------------------------------------------- */
1161
1162 static void
1163 edit_right_word_move_cmd (WEdit * edit)
1164 {
1165     edit_right_word_move (edit, 0);
1166     edit->force |= REDRAW_PAGE;
1167 }
1168
1169 /* --------------------------------------------------------------------------------------------- */
1170
1171 static void
1172 edit_right_char_move_cmd (WEdit * edit)
1173 {
1174     int cw = 1;
1175     int c = 0;
1176     if (edit->utf8)
1177     {
1178         c = edit_get_utf (edit, edit->curs1, &cw);
1179         if (cw < 1)
1180             cw = 1;
1181     }
1182     else
1183     {
1184         c = edit_get_byte (edit, edit->curs1);
1185     }
1186     if (option_cursor_beyond_eol && c == '\n')
1187     {
1188         edit->over_col++;
1189     }
1190     else
1191     {
1192         edit_cursor_move (edit, cw);
1193     }
1194 }
1195
1196 /* --------------------------------------------------------------------------------------------- */
1197
1198 static void
1199 edit_left_char_move_cmd (WEdit * edit)
1200 {
1201     int cw = 1;
1202     if (edit->column_highlight
1203         && option_cursor_beyond_eol
1204         && edit->mark1 != edit->mark2
1205         && edit->over_col == 0 && edit->curs1 == edit_bol (edit, edit->curs1))
1206         return;
1207     if (edit->utf8)
1208     {
1209         edit_get_prev_utf (edit, edit->curs1, &cw);
1210         if (cw < 1)
1211             cw = 1;
1212     }
1213     if (option_cursor_beyond_eol && edit->over_col > 0)
1214     {
1215         edit->over_col--;
1216     }
1217     else
1218     {
1219         edit_cursor_move (edit, -cw);
1220     }
1221 }
1222
1223 /* --------------------------------------------------------------------------------------------- */
1224 /** Up or down cursor moving.
1225  direction = TRUE - move up
1226            = FALSE - move down
1227 */
1228
1229 static void
1230 edit_move_updown (WEdit * edit, unsigned long i, int do_scroll, gboolean direction)
1231 {
1232     unsigned long p;
1233     unsigned long l = (direction) ? edit->curs_line : edit->total_lines - edit->curs_line;
1234
1235     if (i > l)
1236         i = l;
1237
1238     if (i == 0)
1239         return;
1240
1241     if (i > 1)
1242         edit->force |= REDRAW_PAGE;
1243     if (do_scroll)
1244     {
1245         if (direction)
1246             edit_scroll_upward (edit, i);
1247         else
1248             edit_scroll_downward (edit, i);
1249     }
1250     p = edit_bol (edit, edit->curs1);
1251
1252     p = (direction) ? edit_move_backward (edit, p, i) : edit_move_forward (edit, p, i, 0);
1253
1254     edit_cursor_move (edit, p - edit->curs1);
1255
1256     edit_move_to_prev_col (edit, p);
1257
1258     /* search start of current multibyte char (like CJK) */
1259     if (edit->curs1 + 1 < edit->last_byte)
1260     {
1261         edit_right_char_move_cmd (edit);
1262         edit_left_char_move_cmd (edit);
1263     }
1264
1265     edit->search_start = edit->curs1;
1266     edit->found_len = 0;
1267 }
1268
1269 /* --------------------------------------------------------------------------------------------- */
1270
1271 static void
1272 edit_right_delete_word (WEdit * edit)
1273 {
1274     int c1, c2;
1275     for (;;)
1276     {
1277         if (edit->curs1 >= edit->last_byte)
1278             break;
1279         c1 = edit_delete (edit, 1);
1280         c2 = edit_get_byte (edit, edit->curs1);
1281         if (c1 == '\n' || c2 == '\n')
1282             break;
1283         if ((isspace (c1) == 0) != (isspace (c2) == 0))
1284             break;
1285         if (!(my_type_of (c1) & my_type_of (c2)))
1286             break;
1287     }
1288 }
1289
1290 /* --------------------------------------------------------------------------------------------- */
1291
1292 static void
1293 edit_left_delete_word (WEdit * edit)
1294 {
1295     int c1, c2;
1296     for (;;)
1297     {
1298         if (edit->curs1 <= 0)
1299             break;
1300         c1 = edit_backspace (edit, 1);
1301         c2 = edit_get_byte (edit, edit->curs1 - 1);
1302         if (c1 == '\n' || c2 == '\n')
1303             break;
1304         if ((isspace (c1) == 0) != (isspace (c2) == 0))
1305             break;
1306         if (!(my_type_of (c1) & my_type_of (c2)))
1307             break;
1308     }
1309 }
1310
1311 /* --------------------------------------------------------------------------------------------- */
1312 /**
1313    the start column position is not recorded, and hence does not
1314    undo as it happed. But who would notice.
1315  */
1316
1317 static void
1318 edit_do_undo (WEdit * edit)
1319 {
1320     long ac;
1321     long count = 0;
1322
1323     edit->undo_stack_disable = 1;       /* don't record undo's onto undo stack! */
1324     edit->over_col = 0;
1325     while ((ac = edit_pop_undo_action (edit)) < KEY_PRESS)
1326     {
1327         switch ((int) ac)
1328         {
1329         case STACK_BOTTOM:
1330             goto done_undo;
1331         case CURS_RIGHT:
1332             edit_cursor_move (edit, 1);
1333             break;
1334         case CURS_LEFT:
1335             edit_cursor_move (edit, -1);
1336             break;
1337         case BACKSPACE:
1338         case BACKSPACE_BR:
1339             edit_backspace (edit, 1);
1340             break;
1341         case DELCHAR:
1342         case DELCHAR_BR:
1343             edit_delete (edit, 1);
1344             break;
1345         case COLUMN_ON:
1346             edit->column_highlight = 1;
1347             break;
1348         case COLUMN_OFF:
1349             edit->column_highlight = 0;
1350             break;
1351         }
1352         if (ac >= 256 && ac < 512)
1353             edit_insert_ahead (edit, ac - 256);
1354         if (ac >= 0 && ac < 256)
1355             edit_insert (edit, ac);
1356
1357         if (ac >= MARK_1 - 2 && ac < MARK_2 - 2)
1358         {
1359             edit->mark1 = ac - MARK_1;
1360             edit->column1 = edit_move_forward3 (edit, edit_bol (edit, edit->mark1), 0, edit->mark1);
1361         }
1362         if (ac >= MARK_2 - 2 && ac < MARK_CURS - 2)
1363         {
1364             edit->mark2 = ac - MARK_2;
1365             edit->column2 = edit_move_forward3 (edit, edit_bol (edit, edit->mark2), 0, edit->mark2);
1366         }
1367         else if (ac >= MARK_CURS - 2 && ac < KEY_PRESS)
1368         {
1369             edit->end_mark_curs = ac - MARK_CURS;
1370         }
1371         if (count++)
1372             edit->force |= REDRAW_PAGE; /* more than one pop usually means something big */
1373     }
1374
1375     if (edit->start_display > ac - KEY_PRESS)
1376     {
1377         edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
1378         edit->force |= REDRAW_PAGE;
1379     }
1380     else if (edit->start_display < ac - KEY_PRESS)
1381     {
1382         edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
1383         edit->force |= REDRAW_PAGE;
1384     }
1385     edit->start_display = ac - KEY_PRESS;       /* see push and pop above */
1386     edit_update_curs_row (edit);
1387
1388   done_undo:;
1389     edit->undo_stack_disable = 0;
1390 }
1391
1392 static void
1393 edit_do_redo (WEdit * edit)
1394 {
1395     long ac;
1396     long count = 0;
1397
1398     if (edit->redo_stack_reset)
1399         return;
1400
1401     edit->over_col = 0;
1402     while ((ac = edit_pop_redo_action (edit)) < KEY_PRESS)
1403     {
1404         switch ((int) ac)
1405         {
1406         case STACK_BOTTOM:
1407             goto done_redo;
1408         case CURS_RIGHT:
1409             edit_cursor_move (edit, 1);
1410             break;
1411         case CURS_LEFT:
1412             edit_cursor_move (edit, -1);
1413             break;
1414         case BACKSPACE:
1415             edit_backspace (edit, 1);
1416             break;
1417         case DELCHAR:
1418             edit_delete (edit, 1);
1419             break;
1420         case COLUMN_ON:
1421             edit->column_highlight = 1;
1422             break;
1423         case COLUMN_OFF:
1424             edit->column_highlight = 0;
1425             break;
1426         }
1427         if (ac >= 256 && ac < 512)
1428             edit_insert_ahead (edit, ac - 256);
1429         if (ac >= 0 && ac < 256)
1430             edit_insert (edit, ac);
1431
1432         if (ac >= MARK_1 - 2 && ac < MARK_2 - 2)
1433         {
1434             edit->mark1 = ac - MARK_1;
1435             edit->column1 = edit_move_forward3 (edit, edit_bol (edit, edit->mark1), 0, edit->mark1);
1436         }
1437         else if (ac >= MARK_2 - 2 && ac < KEY_PRESS)
1438         {
1439             edit->mark2 = ac - MARK_2;
1440             edit->column2 = edit_move_forward3 (edit, edit_bol (edit, edit->mark2), 0, edit->mark2);
1441         }
1442         /* more than one pop usually means something big */
1443         if (count++)
1444             edit->force |= REDRAW_PAGE;
1445     }
1446
1447     if (edit->start_display > ac - KEY_PRESS)
1448     {
1449         edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
1450         edit->force |= REDRAW_PAGE;
1451     }
1452     else if (edit->start_display < ac - KEY_PRESS)
1453     {
1454         edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
1455         edit->force |= REDRAW_PAGE;
1456     }
1457     edit->start_display = ac - KEY_PRESS;       /* see push and pop above */
1458     edit_update_curs_row (edit);
1459
1460   done_redo:;
1461 }
1462
1463 static void
1464 edit_group_undo (WEdit * edit)
1465 {
1466     long ac = KEY_PRESS;
1467     long cur_ac = KEY_PRESS;
1468     while (ac != STACK_BOTTOM && ac == cur_ac)
1469     {
1470         cur_ac = get_prev_undo_action (edit);
1471         edit_do_undo (edit);
1472         ac = get_prev_undo_action (edit);
1473         /* exit from cycle if option_group_undo is not set,
1474          * and make single UNDO operation
1475          */
1476         if (!option_group_undo)
1477             ac = STACK_BOTTOM;
1478     }
1479 }
1480
1481 /* --------------------------------------------------------------------------------------------- */
1482
1483 static void
1484 edit_delete_to_line_end (WEdit * edit)
1485 {
1486     while (edit_get_byte (edit, edit->curs1) != '\n')
1487     {
1488         if (!edit->curs2)
1489             break;
1490         edit_delete (edit, 1);
1491     }
1492 }
1493
1494 /* --------------------------------------------------------------------------------------------- */
1495
1496 static void
1497 edit_delete_to_line_begin (WEdit * edit)
1498 {
1499     while (edit_get_byte (edit, edit->curs1 - 1) != '\n')
1500     {
1501         if (!edit->curs1)
1502             break;
1503         edit_backspace (edit, 1);
1504     }
1505 }
1506
1507 /* --------------------------------------------------------------------------------------------- */
1508
1509 static int
1510 is_aligned_on_a_tab (WEdit * edit)
1511 {
1512     edit_update_curs_col (edit);
1513     return !((edit->curs_col % (TAB_SIZE * space_width))
1514              && edit->curs_col % (TAB_SIZE * space_width) != (HALF_TAB_SIZE * space_width));
1515 }
1516
1517 /* --------------------------------------------------------------------------------------------- */
1518
1519 static int
1520 right_of_four_spaces (WEdit * edit)
1521 {
1522     int i, ch = 0;
1523     for (i = 1; i <= HALF_TAB_SIZE; i++)
1524         ch |= edit_get_byte (edit, edit->curs1 - i);
1525     if (ch == ' ')
1526         return is_aligned_on_a_tab (edit);
1527     return 0;
1528 }
1529
1530 /* --------------------------------------------------------------------------------------------- */
1531
1532 static int
1533 left_of_four_spaces (WEdit * edit)
1534 {
1535     int i, ch = 0;
1536     for (i = 0; i < HALF_TAB_SIZE; i++)
1537         ch |= edit_get_byte (edit, edit->curs1 + i);
1538     if (ch == ' ')
1539         return is_aligned_on_a_tab (edit);
1540     return 0;
1541 }
1542
1543 /* --------------------------------------------------------------------------------------------- */
1544
1545 static void
1546 edit_auto_indent (WEdit * edit)
1547 {
1548     long p;
1549     char c;
1550     p = edit->curs1;
1551     /* use the previous line as a template */
1552     p = edit_move_backward (edit, p, 1);
1553     /* copy the leading whitespace of the line */
1554     for (;;)
1555     {                           /* no range check - the line _is_ \n-terminated */
1556         c = edit_get_byte (edit, p++);
1557         if (c != ' ' && c != '\t')
1558             break;
1559         edit_insert (edit, c);
1560     }
1561 }
1562
1563 /* --------------------------------------------------------------------------------------------- */
1564
1565 static inline void
1566 edit_double_newline (WEdit * edit)
1567 {
1568     edit_insert (edit, '\n');
1569     if (edit_get_byte (edit, edit->curs1) == '\n')
1570         return;
1571     if (edit_get_byte (edit, edit->curs1 - 2) == '\n')
1572         return;
1573     edit->force |= REDRAW_PAGE;
1574     edit_insert (edit, '\n');
1575 }
1576
1577
1578 /* --------------------------------------------------------------------------------------------- */
1579
1580 static void
1581 insert_spaces_tab (WEdit * edit, gboolean half)
1582 {
1583     int i;
1584
1585     edit_update_curs_col (edit);
1586     i = option_tab_spacing * space_width;
1587     if (half)
1588         i /= 2;
1589     i = ((edit->curs_col / i) + 1) * i - edit->curs_col;
1590     while (i > 0)
1591     {
1592         edit_insert (edit, ' ');
1593         i -= space_width;
1594     }
1595 }
1596
1597 /* --------------------------------------------------------------------------------------------- */
1598
1599 static inline void
1600 edit_tab_cmd (WEdit * edit)
1601 {
1602     int i;
1603
1604     if (option_fake_half_tabs)
1605     {
1606         if (is_in_indent (edit))
1607         {
1608             /*insert a half tab (usually four spaces) unless there is a
1609                half tab already behind, then delete it and insert a
1610                full tab. */
1611             if (option_fill_tabs_with_spaces || !right_of_four_spaces (edit))
1612                 insert_spaces_tab (edit, TRUE);
1613             else
1614             {
1615                 for (i = 1; i <= HALF_TAB_SIZE; i++)
1616                     edit_backspace (edit, 1);
1617                 edit_insert (edit, '\t');
1618             }
1619             return;
1620         }
1621     }
1622     if (option_fill_tabs_with_spaces)
1623         insert_spaces_tab (edit, FALSE);
1624     else
1625         edit_insert (edit, '\t');
1626 }
1627
1628 /* --------------------------------------------------------------------------------------------- */
1629
1630 static void
1631 check_and_wrap_line (WEdit * edit)
1632 {
1633     int curs, c;
1634     if (!option_typewriter_wrap)
1635         return;
1636     edit_update_curs_col (edit);
1637     if (edit->curs_col < option_word_wrap_line_length)
1638         return;
1639     curs = edit->curs1;
1640     for (;;)
1641     {
1642         curs--;
1643         c = edit_get_byte (edit, curs);
1644         if (c == '\n' || curs <= 0)
1645         {
1646             edit_insert (edit, '\n');
1647             return;
1648         }
1649         if (c == ' ' || c == '\t')
1650         {
1651             int current = edit->curs1;
1652             edit_cursor_move (edit, curs - edit->curs1 + 1);
1653             edit_insert (edit, '\n');
1654             edit_cursor_move (edit, current - edit->curs1 + 1);
1655             return;
1656         }
1657     }
1658 }
1659
1660 /* --------------------------------------------------------------------------------------------- */
1661 /** this find the matching bracket in either direction, and sets edit->bracket */
1662
1663 static long
1664 edit_get_bracket (WEdit * edit, int in_screen, unsigned long furthest_bracket_search)
1665 {
1666     const char *const b = "{}{[][()(", *p;
1667     int i = 1, a, inc = -1, c, d, n = 0;
1668     unsigned long j = 0;
1669     long q;
1670     edit_update_curs_row (edit);
1671     c = edit_get_byte (edit, edit->curs1);
1672     p = strchr (b, c);
1673     /* no limit */
1674     if (!furthest_bracket_search)
1675         furthest_bracket_search--;
1676     /* not on a bracket at all */
1677     if (!p)
1678         return -1;
1679     /* the matching bracket */
1680     d = p[1];
1681     /* going left or right? */
1682     if (strchr ("{[(", c))
1683         inc = 1;
1684     for (q = edit->curs1 + inc;; q += inc)
1685     {
1686         /* out of buffer? */
1687         if (q >= edit->last_byte || q < 0)
1688             break;
1689         a = edit_get_byte (edit, q);
1690         /* don't want to eat CPU */
1691         if (j++ > furthest_bracket_search)
1692             break;
1693         /* out of screen? */
1694         if (in_screen)
1695         {
1696             if (q < edit->start_display)
1697                 break;
1698             /* count lines if searching downward */
1699             if (inc > 0 && a == '\n')
1700                 if (n++ >= edit->widget.lines - edit->curs_row) /* out of screen */
1701                     break;
1702         }
1703         /* count bracket depth */
1704         i += (a == c) - (a == d);
1705         /* return if bracket depth is zero */
1706         if (!i)
1707             return q;
1708     }
1709     /* no match */
1710     return -1;
1711 }
1712
1713 /* --------------------------------------------------------------------------------------------- */
1714
1715 static inline void
1716 edit_goto_matching_bracket (WEdit * edit)
1717 {
1718     long q;
1719
1720     q = edit_get_bracket (edit, 0, 0);
1721     if (q >= 0)
1722     {
1723         edit->bracket = edit->curs1;
1724         edit->force |= REDRAW_PAGE;
1725         edit_cursor_move (edit, q - edit->curs1);
1726     }
1727 }
1728
1729 /* --------------------------------------------------------------------------------------------- */
1730
1731 static void
1732 edit_move_block_to_right (WEdit * edit)
1733 {
1734     long start_mark, end_mark;
1735     long cur_bol, start_bol;
1736
1737     if (eval_marks (edit, &start_mark, &end_mark))
1738         return;
1739
1740     start_bol = edit_bol (edit, start_mark);
1741     cur_bol = edit_bol (edit, end_mark - 1);
1742
1743     do
1744     {
1745         edit_cursor_move (edit, cur_bol - edit->curs1);
1746         if (option_fill_tabs_with_spaces)
1747             insert_spaces_tab (edit, option_fake_half_tabs);
1748         else
1749             edit_insert (edit, '\t');
1750         edit_cursor_move (edit, edit_bol (edit, cur_bol) - edit->curs1);
1751
1752         if (cur_bol == 0)
1753             break;
1754
1755         cur_bol = edit_bol (edit, cur_bol - 1);
1756     }
1757     while (cur_bol >= start_bol);
1758
1759     edit->force |= REDRAW_PAGE;
1760 }
1761
1762 /* --------------------------------------------------------------------------------------------- */
1763
1764 static void
1765 edit_move_block_to_left (WEdit * edit)
1766 {
1767     long start_mark, end_mark;
1768     long cur_bol, start_bol;
1769     int i;
1770
1771     if (eval_marks (edit, &start_mark, &end_mark))
1772         return;
1773
1774     start_bol = edit_bol (edit, start_mark);
1775     cur_bol = edit_bol (edit, end_mark - 1);
1776
1777     do
1778     {
1779         int del_tab_width;
1780         int next_char;
1781
1782         edit_cursor_move (edit, cur_bol - edit->curs1);
1783
1784         if (option_fake_half_tabs)
1785             del_tab_width = HALF_TAB_SIZE;
1786         else
1787             del_tab_width = option_tab_spacing;
1788
1789         next_char = edit_get_byte (edit, edit->curs1);
1790         if (next_char == '\t')
1791             edit_delete (edit, 1);
1792         else if (next_char == ' ')
1793             for (i = 1; i <= del_tab_width; i++)
1794             {
1795                 if (next_char == ' ')
1796                     edit_delete (edit, 1);
1797                 next_char = edit_get_byte (edit, edit->curs1);
1798             }
1799
1800         if (cur_bol == 0)
1801             break;
1802
1803         cur_bol = edit_bol (edit, cur_bol - 1);
1804     }
1805     while (cur_bol >= start_bol);
1806
1807     edit->force |= REDRAW_PAGE;
1808 }
1809
1810 /* --------------------------------------------------------------------------------------------- */
1811 /**
1812  * prints at the cursor
1813  * @returns the number of chars printed
1814  */
1815
1816 static size_t
1817 edit_print_string (WEdit * e, const char *s)
1818 {
1819     size_t i = 0;
1820
1821     while (s[i] != '\0')
1822         edit_execute_cmd (e, CK_InsertChar, (unsigned char) s[i++]);
1823     e->force |= REDRAW_COMPLETELY;
1824     edit_update_screen (e);
1825     return i;
1826 }
1827
1828 /* --------------------------------------------------------------------------------------------- */
1829 /*** public functions ****************************************************************************/
1830 /* --------------------------------------------------------------------------------------------- */
1831
1832 /** User edit menu, like user menu (F2) but only in editor. */
1833
1834 void
1835 user_menu (WEdit * edit, const char *menu_file, int selected_entry)
1836 {
1837     char *block_file;
1838     int nomark;
1839     long curs;
1840     long start_mark, end_mark;
1841     struct stat status;
1842     vfs_path_t *block_file_vpath;
1843
1844     block_file = mc_config_get_full_path (EDIT_BLOCK_FILE);
1845     block_file_vpath = vfs_path_from_str (block_file);
1846     curs = edit->curs1;
1847     nomark = eval_marks (edit, &start_mark, &end_mark);
1848     if (nomark == 0)
1849         edit_save_block (edit, block_file, start_mark, end_mark);
1850
1851     /* run shell scripts from menu */
1852     if (user_menu_cmd (edit, menu_file, selected_entry)
1853         && (mc_stat (block_file_vpath, &status) == 0) && (status.st_size != 0))
1854     {
1855         int rc = 0;
1856         FILE *fd;
1857
1858         /* i.e. we have marked block */
1859         if (nomark == 0)
1860             rc = edit_block_delete_cmd (edit);
1861
1862         if (rc == 0)
1863         {
1864             long ins_len;
1865
1866             ins_len = edit_insert_file (edit, block_file);
1867             if (nomark == 0 && ins_len > 0)
1868                 edit_set_markers (edit, start_mark, start_mark + ins_len, 0, 0);
1869         }
1870         /* truncate block file */
1871         fd = fopen (block_file, "w");
1872         if (fd != NULL)
1873             fclose (fd);
1874     }
1875     edit_cursor_move (edit, curs - edit->curs1);
1876     edit_refresh_cmd (edit);
1877     edit->force |= REDRAW_COMPLETELY;
1878
1879     g_free (block_file);
1880     vfs_path_free (block_file_vpath);
1881 }
1882
1883 /* --------------------------------------------------------------------------------------------- */
1884
1885 int
1886 edit_get_byte (WEdit * edit, long byte_index)
1887 {
1888     unsigned long p;
1889     if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
1890         return '\n';
1891
1892     if (byte_index >= edit->curs1)
1893     {
1894         p = edit->curs1 + edit->curs2 - byte_index - 1;
1895         return edit->buffers2[p >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1];
1896     }
1897     else
1898     {
1899         return edit->buffers1[byte_index >> S_EDIT_BUF_SIZE][byte_index & M_EDIT_BUF_SIZE];
1900     }
1901 }
1902
1903 /* --------------------------------------------------------------------------------------------- */
1904
1905 int
1906 edit_get_utf (WEdit * edit, long byte_index, int *char_width)
1907 {
1908     gchar *str = NULL;
1909     int res = -1;
1910     gunichar ch;
1911     gchar *next_ch = NULL;
1912     int width = 0;
1913     gchar utf8_buf[UTF8_CHAR_LEN + 1];
1914
1915     if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
1916     {
1917         *char_width = 0;
1918         return '\n';
1919     }
1920
1921     str = edit_get_byte_ptr (edit, byte_index);
1922
1923     if (str == NULL)
1924     {
1925         *char_width = 0;
1926         return 0;
1927     }
1928
1929     res = g_utf8_get_char_validated (str, -1);
1930
1931     if (res < 0)
1932     {
1933         /* Retry with explicit bytes to make sure it's not a buffer boundary */
1934         int i;
1935         for (i = 0; i < UTF8_CHAR_LEN; i++)
1936             utf8_buf[i] = edit_get_byte (edit, byte_index + i);
1937         utf8_buf[UTF8_CHAR_LEN] = '\0';
1938         str = utf8_buf;
1939         res = g_utf8_get_char_validated (str, -1);
1940     }
1941
1942     if (res < 0)
1943     {
1944         ch = *str;
1945         width = 0;
1946     }
1947     else
1948     {
1949         ch = res;
1950         /* Calculate UTF-8 char width */
1951         next_ch = g_utf8_next_char (str);
1952         if (next_ch)
1953         {
1954             width = next_ch - str;
1955         }
1956         else
1957         {
1958             ch = 0;
1959             width = 0;
1960         }
1961     }
1962     *char_width = width;
1963     return ch;
1964 }
1965
1966 /* --------------------------------------------------------------------------------------------- */
1967
1968 char *
1969 edit_get_write_filter (const char *write_name, const char *filename)
1970 {
1971     int i;
1972     char *p, *writename;
1973
1974     i = edit_find_filter (filename);
1975     if (i < 0)
1976         return NULL;
1977
1978     writename = name_quote (write_name, 0);
1979     p = g_strdup_printf (all_filters[i].write, writename);
1980     g_free (writename);
1981     return p;
1982 }
1983
1984 /* --------------------------------------------------------------------------------------------- */
1985
1986 long
1987 edit_write_stream (WEdit * edit, FILE * f)
1988 {
1989     long i;
1990
1991     if (edit->lb == LB_ASIS)
1992     {
1993         for (i = 0; i < edit->last_byte; i++)
1994             if (fputc (edit_get_byte (edit, i), f) < 0)
1995                 break;
1996         return i;
1997     }
1998
1999     /* change line breaks */
2000     for (i = 0; i < edit->last_byte; i++)
2001     {
2002         unsigned char c = edit_get_byte (edit, i);
2003
2004         if (!(c == '\n' || c == '\r'))
2005         {
2006             /* not line break */
2007             if (fputc (c, f) < 0)
2008                 return i;
2009         }
2010         else
2011         {                       /* (c == '\n' || c == '\r') */
2012             unsigned char c1 = edit_get_byte (edit, i + 1);     /* next char */
2013
2014             switch (edit->lb)
2015             {
2016             case LB_UNIX:      /* replace "\r\n" or '\r' to '\n' */
2017                 /* put one line break unconditionally */
2018                 if (fputc ('\n', f) < 0)
2019                     return i;
2020
2021                 i++;            /* 2 chars are processed */
2022
2023                 if (c == '\r' && c1 == '\n')
2024                     /* Windows line break; go to the next char */
2025                     break;
2026
2027                 if (c == '\r' && c1 == '\r')
2028                 {
2029                     /* two Macintosh line breaks; put second line break */
2030                     if (fputc ('\n', f) < 0)
2031                         return i;
2032                     break;
2033                 }
2034
2035                 if (fputc (c1, f) < 0)
2036                     return i;
2037                 break;
2038
2039             case LB_WIN:       /* replace '\n' or '\r' to "\r\n" */
2040                 /* put one line break unconditionally */
2041                 if (fputc ('\r', f) < 0 || fputc ('\n', f) < 0)
2042                     return i;
2043
2044                 if (c == '\r' && c1 == '\n')
2045                     /* Windows line break; go to the next char */
2046                     i++;
2047                 break;
2048
2049             case LB_MAC:       /* replace "\r\n" or '\n' to '\r' */
2050                 /* put one line break unconditionally */
2051                 if (fputc ('\r', f) < 0)
2052                     return i;
2053
2054                 i++;            /* 2 chars are processed */
2055
2056                 if (c == '\r' && c1 == '\n')
2057                     /* Windows line break; go to the next char */
2058                     break;
2059
2060                 if (c == '\n' && c1 == '\n')
2061                 {
2062                     /* two Windows line breaks; put second line break */
2063                     if (fputc ('\r', f) < 0)
2064                         return i;
2065                     break;
2066                 }
2067
2068                 if (fputc (c1, f) < 0)
2069                     return i;
2070                 break;
2071             case LB_ASIS:      /* default without changes */
2072                 break;
2073             }
2074         }
2075     }
2076
2077     return edit->last_byte;
2078 }
2079
2080 /* --------------------------------------------------------------------------------------------- */
2081 /** inserts a file at the cursor, returns count of inserted bytes on success */
2082 long
2083 edit_insert_file (WEdit * edit, const char *filename)
2084 {
2085     char *p = NULL;
2086     long ins_len = 0;
2087     vfs_path_t *vpath;
2088
2089     vpath = vfs_path_from_str (filename);
2090     p = edit_get_filter (filename);
2091     if (p != NULL)
2092     {
2093         FILE *f;
2094         long current = edit->curs1;
2095
2096         f = (FILE *) popen (p, "r");
2097         if (f != NULL)
2098         {
2099             edit_insert_stream (edit, f);
2100             ins_len = edit->curs1 - current;
2101             edit_cursor_move (edit, -ins_len);
2102             if (pclose (f) > 0)
2103             {
2104                 char *errmsg;
2105
2106                 errmsg = g_strdup_printf (_("Error reading from pipe: %s"), p);
2107                 edit_error_dialog (_("Error"), errmsg);
2108                 g_free (errmsg);
2109                 ins_len = -1;
2110                 goto ret;
2111             }
2112         }
2113         else
2114         {
2115             char *errmsg;
2116
2117             errmsg = g_strdup_printf (_("Cannot open pipe for reading: %s"), p);
2118             edit_error_dialog (_("Error"), errmsg);
2119             g_free (errmsg);
2120             ins_len = -1;
2121             goto ret;
2122         }
2123     }
2124     else
2125     {
2126         int i, file, blocklen;
2127         long current = edit->curs1;
2128         int vertical_insertion = 0;
2129         char *buf;
2130
2131         file = mc_open (vpath, O_RDONLY | O_BINARY);
2132         if (file == -1)
2133         {
2134             ins_len = -1;
2135             goto ret;
2136         }
2137         buf = g_malloc0 (TEMP_BUF_LEN);
2138         blocklen = mc_read (file, buf, sizeof (VERTICAL_MAGIC));
2139         if (blocklen > 0)
2140         {
2141             /* if contain signature VERTICAL_MAGIC then it vertical block */
2142             if (memcmp (buf, VERTICAL_MAGIC, sizeof (VERTICAL_MAGIC)) == 0)
2143                 vertical_insertion = 1;
2144             else
2145                 mc_lseek (file, 0, SEEK_SET);
2146         }
2147
2148         if (vertical_insertion)
2149         {
2150             long mark1, mark2;
2151             int c1, c2;
2152
2153             blocklen = edit_insert_column_of_text_from_file (edit, file, &mark1, &mark2, &c1, &c2);
2154             edit_set_markers (edit, edit->curs1, mark2, c1, c2);
2155             /* highlight inserted text then not persistent blocks */
2156             if (!option_persistent_selections)
2157             {
2158                 if (!edit->column_highlight)
2159                     edit_push_undo_action (edit, COLUMN_OFF);
2160                 edit->column_highlight = 1;
2161             }
2162         }
2163         else
2164         {
2165             while ((blocklen = mc_read (file, (char *) buf, TEMP_BUF_LEN)) > 0)
2166             {
2167                 for (i = 0; i < blocklen; i++)
2168                     edit_insert (edit, buf[i]);
2169             }
2170             /* highlight inserted text then not persistent blocks */
2171             if (!option_persistent_selections && edit->modified)
2172             {
2173                 edit_set_markers (edit, edit->curs1, current, 0, 0);
2174                 if (edit->column_highlight)
2175                     edit_push_undo_action (edit, COLUMN_ON);
2176                 edit->column_highlight = 0;
2177             }
2178         }
2179
2180         edit->force |= REDRAW_PAGE;
2181         ins_len = edit->curs1 - current;
2182         edit_cursor_move (edit, -ins_len);
2183         g_free (buf);
2184         mc_close (file);
2185         if (blocklen != 0)
2186             ins_len = 0;
2187     }
2188
2189   ret:
2190     g_free (p);
2191     vfs_path_free (vpath);
2192     return ins_len;
2193 }
2194
2195 /* --------------------------------------------------------------------------------------------- */
2196 /**
2197  * Fill in the edit structure.  Return NULL on failure.  Pass edit as
2198  * NULL to allocate a new structure.
2199  *
2200  * If line is 0, try to restore saved position.  Otherwise put the
2201  * cursor on that line and show it in the middle of the screen.
2202  */
2203
2204 WEdit *
2205 edit_init (WEdit * edit, int y, int x, int lines, int cols, const char *filename, long line)
2206 {
2207     gboolean to_free = FALSE;
2208
2209     option_auto_syntax = 1;     /* Resetting to auto on every invokation */
2210     if (option_line_state)
2211         option_line_state_width = LINE_STATE_WIDTH;
2212     else
2213         option_line_state_width = 0;
2214
2215     if (edit == NULL)
2216     {
2217 #ifdef ENABLE_NLS
2218         /*
2219          * Expand option_whole_chars_search by national letters using
2220          * current locale
2221          */
2222
2223         static char option_whole_chars_search_buf[256];
2224
2225         if (option_whole_chars_search_buf != option_whole_chars_search)
2226         {
2227             size_t i;
2228             size_t len = str_term_width1 (option_whole_chars_search);
2229
2230             strcpy (option_whole_chars_search_buf, option_whole_chars_search);
2231
2232             for (i = 1; i <= sizeof (option_whole_chars_search_buf); i++)
2233             {
2234                 if (g_ascii_islower ((gchar) i) && !strchr (option_whole_chars_search, i))
2235                 {
2236                     option_whole_chars_search_buf[len++] = i;
2237                 }
2238             }
2239
2240             option_whole_chars_search_buf[len] = 0;
2241             option_whole_chars_search = option_whole_chars_search_buf;
2242         }
2243 #endif /* ENABLE_NLS */
2244         edit = g_malloc0 (sizeof (WEdit));
2245         edit->search = NULL;
2246         to_free = TRUE;
2247     }
2248
2249     edit_purge_widget (edit);
2250     edit->widget.y = y;
2251     edit->widget.x = x;
2252     edit->widget.lines = lines;
2253     edit->widget.cols = cols;
2254
2255     edit->stat1.st_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
2256     edit->stat1.st_uid = getuid ();
2257     edit->stat1.st_gid = getgid ();
2258     edit->stat1.st_mtime = 0;
2259
2260     edit->over_col = 0;
2261     edit->bracket = -1;
2262     edit->force |= REDRAW_PAGE;
2263     edit_set_filename (edit, filename);
2264
2265     edit->undo_stack_size = START_STACK_SIZE;
2266     edit->undo_stack_size_mask = START_STACK_SIZE - 1;
2267     edit->undo_stack = g_malloc0 ((edit->undo_stack_size + 10) * sizeof (long));
2268
2269     edit->redo_stack_size = START_STACK_SIZE;
2270     edit->redo_stack_size_mask = START_STACK_SIZE - 1;
2271     edit->redo_stack = g_malloc0 ((edit->redo_stack_size + 10) * sizeof (long));
2272
2273     edit->utf8 = 0;
2274     edit->converter = str_cnv_from_term;
2275     edit_set_codeset (edit);
2276
2277     if (edit_load_file (edit))
2278     {
2279         /* edit_load_file already gives an error message */
2280         if (to_free)
2281             g_free (edit);
2282         return NULL;
2283     }
2284
2285     edit->loading_done = 1;
2286     edit->modified = 0;
2287     edit->locked = 0;
2288     edit_load_syntax (edit, NULL, NULL);
2289     {
2290         int color;
2291         edit_get_syntax_color (edit, -1, &color);
2292     }
2293
2294     /* load saved cursor position */
2295     if ((line == 0) && option_save_position)
2296         edit_load_position (edit);
2297     else
2298     {
2299         if (line <= 0)
2300             line = 1;
2301         edit_move_display (edit, line - 1);
2302         edit_move_to_line (edit, line - 1);
2303     }
2304
2305     edit_load_macro_cmd (edit);
2306     return edit;
2307 }
2308
2309 /* --------------------------------------------------------------------------------------------- */
2310 /** Clear the edit struct, freeing everything in it.  Return 1 on success */
2311
2312 int
2313 edit_clean (WEdit * edit)
2314 {
2315     int j = 0;
2316
2317     if (!edit)
2318         return 0;
2319
2320     /* a stale lock, remove it */
2321     if (edit->locked)
2322         edit->locked = edit_unlock_file (edit);
2323
2324     /* save cursor position */
2325     if (option_save_position)
2326         edit_save_position (edit);
2327     else if (edit->serialized_bookmarks != NULL)
2328         edit->serialized_bookmarks = (GArray *) g_array_free (edit->serialized_bookmarks, TRUE);
2329
2330     /* File specified on the mcedit command line and never saved */
2331     if (edit->delete_file)
2332         unlink (edit->filename);
2333
2334     edit_free_syntax_rules (edit);
2335     book_mark_flush (edit, -1);
2336     for (; j <= MAXBUFF; j++)
2337     {
2338         g_free (edit->buffers1[j]);
2339         g_free (edit->buffers2[j]);
2340     }
2341
2342     g_free (edit->undo_stack);
2343     g_free (edit->redo_stack);
2344     g_free (edit->filename);
2345     g_free (edit->dir);
2346     mc_search_free (edit->search);
2347     edit->search = NULL;
2348
2349     if (edit->converter != str_cnv_from_term)
2350         str_close_conv (edit->converter);
2351
2352     edit_purge_widget (edit);
2353
2354     return 1;
2355 }
2356
2357 /* --------------------------------------------------------------------------------------------- */
2358 /** returns 1 on success */
2359
2360 int
2361 edit_renew (WEdit * edit)
2362 {
2363     int y = edit->widget.y;
2364     int x = edit->widget.x;
2365     int lines = edit->widget.lines;
2366     int columns = edit->widget.cols;
2367
2368     edit_clean (edit);
2369     return (edit_init (edit, y, x, lines, columns, "", 0) != NULL);
2370 }
2371
2372 /* --------------------------------------------------------------------------------------------- */
2373 /**
2374  * Load a new file into the editor.  If it fails, preserve the old file.
2375  * To do it, allocate a new widget, initialize it and, if the new file
2376  * was loaded, copy the data to the old widget.
2377  * Return 1 on success, 0 on failure.
2378  */
2379
2380 int
2381 edit_reload (WEdit * edit, const char *filename)
2382 {
2383     WEdit *e;
2384     int y = edit->widget.y;
2385     int x = edit->widget.x;
2386     int lines = edit->widget.lines;
2387     int columns = edit->widget.cols;
2388
2389     e = g_malloc0 (sizeof (WEdit));
2390     e->widget = edit->widget;
2391     if (edit_init (e, y, x, lines, columns, filename, 0) == NULL)
2392     {
2393         g_free (e);
2394         return 0;
2395     }
2396     edit_clean (edit);
2397     memcpy (edit, e, sizeof (WEdit));
2398     g_free (e);
2399     return 1;
2400 }
2401
2402 /* --------------------------------------------------------------------------------------------- */
2403 /**
2404  * Load a new file into the editor and set line.  If it fails, preserve the old file.
2405  * To do it, allocate a new widget, initialize it and, if the new file
2406  * was loaded, copy the data to the old widget.
2407  * Return 1 on success, 0 on failure.
2408  */
2409
2410 int
2411 edit_reload_line (WEdit * edit, const char *filename, long line)
2412 {
2413     WEdit *e;
2414     int y = edit->widget.y;
2415     int x = edit->widget.x;
2416     int lines = edit->widget.lines;
2417     int columns = edit->widget.cols;
2418
2419     e = g_malloc0 (sizeof (WEdit));
2420     e->widget = edit->widget;
2421     if (edit_init (e, y, x, lines, columns, filename, line) == NULL)
2422     {
2423         g_free (e);
2424         return 0;
2425     }
2426     edit_clean (edit);
2427     memcpy (edit, e, sizeof (WEdit));
2428     g_free (e);
2429     return 1;
2430 }
2431
2432 /* --------------------------------------------------------------------------------------------- */
2433
2434 void
2435 edit_set_codeset (WEdit * edit)
2436 {
2437 #ifdef HAVE_CHARSET
2438     const char *cp_id;
2439
2440     cp_id =
2441         get_codepage_id (mc_global.source_codepage >=
2442                          0 ? mc_global.source_codepage : mc_global.display_codepage);
2443
2444     if (cp_id != NULL)
2445     {
2446         GIConv conv;
2447         conv = str_crt_conv_from (cp_id);
2448         if (conv != INVALID_CONV)
2449         {
2450             if (edit->converter != str_cnv_from_term)
2451                 str_close_conv (edit->converter);
2452             edit->converter = conv;
2453         }
2454     }
2455
2456     if (cp_id != NULL)
2457         edit->utf8 = str_isutf8 (cp_id);
2458 #else
2459     (void) edit;
2460 #endif
2461 }
2462
2463
2464 /* --------------------------------------------------------------------------------------------- */
2465 /**
2466    Recording stack for undo:
2467    The following is an implementation of a compressed stack. Identical
2468    pushes are recorded by a negative prefix indicating the number of times the
2469    same char was pushed. This saves space for repeated curs-left or curs-right
2470    delete etc.
2471
2472    eg:
2473
2474    pushed:       stored:
2475
2476    a
2477    b             a
2478    b            -3
2479    b             b
2480    c  -->       -4
2481    c             c
2482    c             d
2483    c
2484    d
2485
2486    If the stack long int is 0-255 it represents a normal insert (from a backspace),
2487    256-512 is an insert ahead (from a delete), If it is betwen 600 and 700 it is one
2488    of the cursor functions #define'd in edit-impl.h. 1000 through 700'000'000 is to
2489    set edit->mark1 position. 700'000'000 through 1400'000'000 is to set edit->mark2
2490    position.
2491
2492    The only way the cursor moves or the buffer is changed is through the routines:
2493    insert, backspace, insert_ahead, delete, and cursor_move.
2494    These record the reverse undo movements onto the stack each time they are
2495    called.
2496
2497    Each key press results in a set of actions (insert; delete ...). So each time
2498    a key is pressed the current position of start_display is pushed as
2499    KEY_PRESS + start_display. Then for undoing, we pop until we get to a number
2500    over KEY_PRESS. We then assign this number less KEY_PRESS to start_display. So undo
2501    tracks scrolling and key actions exactly. (KEY_PRESS is about (2^31) * (2/3) = 1400'000'000)
2502
2503  */
2504
2505 void
2506 edit_push_undo_action (WEdit * edit, long c, ...)
2507 {
2508     unsigned long sp = edit->undo_stack_pointer;
2509     unsigned long spm1;
2510     long *t;
2511
2512     /* first enlarge the stack if necessary */
2513     if (sp > edit->undo_stack_size - 10)
2514     {                           /* say */
2515         if (option_max_undo < 256)
2516             option_max_undo = 256;
2517         if (edit->undo_stack_size < (unsigned long) option_max_undo)
2518         {
2519             t = g_realloc (edit->undo_stack, (edit->undo_stack_size * 2 + 10) * sizeof (long));
2520             if (t)
2521             {
2522                 edit->undo_stack = t;
2523                 edit->undo_stack_size <<= 1;
2524                 edit->undo_stack_size_mask = edit->undo_stack_size - 1;
2525             }
2526         }
2527     }
2528     spm1 = (edit->undo_stack_pointer - 1) & edit->undo_stack_size_mask;
2529     if (edit->undo_stack_disable)
2530     {
2531         edit_push_redo_action (edit, KEY_PRESS);
2532         edit_push_redo_action (edit, c);
2533         return;
2534     }
2535     else if (edit->redo_stack_reset)
2536     {
2537         edit->redo_stack_bottom = edit->redo_stack_pointer = 0;
2538     }
2539
2540     if (edit->undo_stack_bottom != sp
2541         && spm1 != edit->undo_stack_bottom
2542         && ((sp - 2) & edit->undo_stack_size_mask) != edit->undo_stack_bottom)
2543     {
2544         int d;
2545         if (edit->undo_stack[spm1] < 0)
2546         {
2547             d = edit->undo_stack[(sp - 2) & edit->undo_stack_size_mask];
2548             if (d == c)
2549             {
2550                 if (edit->undo_stack[spm1] > -1000000000)
2551                 {
2552                     if (c < KEY_PRESS)  /* --> no need to push multiple do-nothings */
2553                     {
2554                         edit->undo_stack[spm1]--;
2555                     }
2556                     return;
2557                 }
2558             }
2559         }
2560         else
2561         {
2562             d = edit->undo_stack[spm1];
2563             if (d == c)
2564             {
2565                 if (c >= KEY_PRESS)
2566                     return;     /* --> no need to push multiple do-nothings */
2567                 edit->undo_stack[sp] = -2;
2568                 goto check_bottom;
2569             }
2570         }
2571     }
2572     edit->undo_stack[sp] = c;
2573
2574   check_bottom:
2575     edit->undo_stack_pointer = (edit->undo_stack_pointer + 1) & edit->undo_stack_size_mask;
2576
2577     /* if the sp wraps round and catches the undo_stack_bottom then erase
2578      * the first set of actions on the stack to make space - by moving
2579      * undo_stack_bottom forward one "key press" */
2580     c = (edit->undo_stack_pointer + 2) & edit->undo_stack_size_mask;
2581     if ((unsigned long) c == edit->undo_stack_bottom ||
2582         (((unsigned long) c + 1) & edit->undo_stack_size_mask) == edit->undo_stack_bottom)
2583         do
2584         {
2585             edit->undo_stack_bottom = (edit->undo_stack_bottom + 1) & edit->undo_stack_size_mask;
2586         }
2587         while (edit->undo_stack[edit->undo_stack_bottom] < KEY_PRESS
2588                && edit->undo_stack_bottom != edit->undo_stack_pointer);
2589
2590     /*If a single key produced enough pushes to wrap all the way round then we would notice that the [undo_stack_bottom] does not contain KEY_PRESS. The stack is then initialised: */
2591     if (edit->undo_stack_pointer != edit->undo_stack_bottom
2592         && edit->undo_stack[edit->undo_stack_bottom] < KEY_PRESS)
2593     {
2594         edit->undo_stack_bottom = edit->undo_stack_pointer = 0;
2595     }
2596 }
2597
2598 void
2599 edit_push_redo_action (WEdit * edit, long c, ...)
2600 {
2601     unsigned long sp = edit->redo_stack_pointer;
2602     unsigned long spm1;
2603     long *t;
2604     /* first enlarge the stack if necessary */
2605     if (sp > edit->redo_stack_size - 10)
2606     {                           /* say */
2607         if (option_max_undo < 256)
2608             option_max_undo = 256;
2609         if (edit->redo_stack_size < (unsigned long) option_max_undo)
2610         {
2611             t = g_realloc (edit->redo_stack, (edit->redo_stack_size * 2 + 10) * sizeof (long));
2612             if (t)
2613             {
2614                 edit->redo_stack = t;
2615                 edit->redo_stack_size <<= 1;
2616                 edit->redo_stack_size_mask = edit->redo_stack_size - 1;
2617             }
2618         }
2619     }
2620     spm1 = (edit->redo_stack_pointer - 1) & edit->redo_stack_size_mask;
2621
2622     if (edit->redo_stack_bottom != sp
2623         && spm1 != edit->redo_stack_bottom
2624         && ((sp - 2) & edit->redo_stack_size_mask) != edit->redo_stack_bottom)
2625     {
2626         int d;
2627         if (edit->redo_stack[spm1] < 0)
2628         {
2629             d = edit->redo_stack[(sp - 2) & edit->redo_stack_size_mask];
2630             if (d == c)
2631             {
2632                 if (edit->redo_stack[spm1] > -1000000000)
2633                 {
2634                     if (c < KEY_PRESS)  /* --> no need to push multiple do-nothings */
2635                         edit->redo_stack[spm1]--;
2636                     return;
2637                 }
2638             }
2639         }
2640         else
2641         {
2642             d = edit->redo_stack[spm1];
2643             if (d == c)
2644             {
2645                 if (c >= KEY_PRESS)
2646                     return;     /* --> no need to push multiple do-nothings */
2647                 edit->redo_stack[sp] = -2;
2648                 goto redo_check_bottom;
2649             }
2650         }
2651     }
2652     edit->redo_stack[sp] = c;
2653
2654   redo_check_bottom:
2655     edit->redo_stack_pointer = (edit->redo_stack_pointer + 1) & edit->redo_stack_size_mask;
2656
2657     /* if the sp wraps round and catches the redo_stack_bottom then erase
2658      * the first set of actions on the stack to make space - by moving
2659      * redo_stack_bottom forward one "key press" */
2660     c = (edit->redo_stack_pointer + 2) & edit->redo_stack_size_mask;
2661     if ((unsigned long) c == edit->redo_stack_bottom ||
2662         (((unsigned long) c + 1) & edit->redo_stack_size_mask) == edit->redo_stack_bottom)
2663         do
2664         {
2665             edit->redo_stack_bottom = (edit->redo_stack_bottom + 1) & edit->redo_stack_size_mask;
2666         }
2667         while (edit->redo_stack[edit->redo_stack_bottom] < KEY_PRESS
2668                && edit->redo_stack_bottom != edit->redo_stack_pointer);
2669
2670     /*
2671      * If a single key produced enough pushes to wrap all the way round then
2672      * we would notice that the [redo_stack_bottom] does not contain KEY_PRESS.
2673      * The stack is then initialised:
2674      */
2675
2676     if (edit->redo_stack_pointer != edit->redo_stack_bottom
2677         && edit->redo_stack[edit->redo_stack_bottom] < KEY_PRESS)
2678         edit->redo_stack_bottom = edit->redo_stack_pointer = 0;
2679
2680 }
2681
2682 /* --------------------------------------------------------------------------------------------- */
2683 /**
2684    Basic low level single character buffer alterations and movements at the cursor.
2685    Returns char passed over, inserted or removed.
2686  */
2687
2688 void
2689 edit_insert (WEdit * edit, int c)
2690 {
2691     /* check if file has grown to large */
2692     if (edit->last_byte >= SIZE_LIMIT)
2693         return;
2694
2695     /* first we must update the position of the display window */
2696     if (edit->curs1 < edit->start_display)
2697     {
2698         edit->start_display++;
2699         if (c == '\n')
2700             edit->start_line++;
2701     }
2702
2703     /* Mark file as modified, unless the file hasn't been fully loaded */
2704     if (edit->loading_done)
2705     {
2706         edit_modification (edit);
2707     }
2708
2709     /* now we must update some info on the file and check if a redraw is required */
2710     if (c == '\n')
2711     {
2712         if (edit->book_mark)
2713             book_mark_inc (edit, edit->curs_line);
2714         edit->curs_line++;
2715         edit->total_lines++;
2716         edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
2717     }
2718
2719     /* save the reverse command onto the undo stack */
2720     /* ordinary char and not space */
2721     if (c > 32)
2722         edit_push_undo_action (edit, BACKSPACE);
2723     else
2724         edit_push_undo_action (edit, BACKSPACE_BR);
2725     /* update markers */
2726     edit->mark1 += (edit->mark1 > edit->curs1);
2727     edit->mark2 += (edit->mark2 > edit->curs1);
2728     edit->last_get_rule += (edit->last_get_rule > edit->curs1);
2729
2730     /* add a new buffer if we've reached the end of the last one */
2731     if (!(edit->curs1 & M_EDIT_BUF_SIZE))
2732         edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2733
2734     /* perform the insertion */
2735     edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE]
2736         = (unsigned char) c;
2737
2738     /* update file length */
2739     edit->last_byte++;
2740
2741     /* update cursor position */
2742     edit->curs1++;
2743 }
2744
2745 /* --------------------------------------------------------------------------------------------- */
2746 /** same as edit_insert and move left */
2747
2748 void
2749 edit_insert_ahead (WEdit * edit, int c)
2750 {
2751     if (edit->last_byte >= SIZE_LIMIT)
2752         return;
2753
2754     if (edit->curs1 < edit->start_display)
2755     {
2756         edit->start_display++;
2757         if (c == '\n')
2758             edit->start_line++;
2759     }
2760     edit_modification (edit);
2761     if (c == '\n')
2762     {
2763         if (edit->book_mark)
2764             book_mark_inc (edit, edit->curs_line);
2765         edit->total_lines++;
2766         edit->force |= REDRAW_AFTER_CURSOR;
2767     }
2768     /* ordinary char and not space */
2769     if (c > 32)
2770         edit_push_undo_action (edit, DELCHAR);
2771     else
2772         edit_push_undo_action (edit, DELCHAR_BR);
2773
2774     edit->mark1 += (edit->mark1 >= edit->curs1);
2775     edit->mark2 += (edit->mark2 >= edit->curs1);
2776     edit->last_get_rule += (edit->last_get_rule >= edit->curs1);
2777
2778     if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
2779         edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2780     edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]
2781         [EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
2782
2783     edit->last_byte++;
2784     edit->curs2++;
2785 }
2786
2787
2788 /* --------------------------------------------------------------------------------------------- */
2789
2790 int
2791 edit_delete (WEdit * edit, const int byte_delete)
2792 {
2793     int p = 0;
2794     int cw = 1;
2795     int i;
2796
2797     if (!edit->curs2)
2798         return 0;
2799
2800     cw = 1;
2801     /* if byte_delete = 1 then delete only one byte not multibyte char */
2802     if (edit->utf8 && byte_delete == 0)
2803     {
2804         edit_get_utf (edit, edit->curs1, &cw);
2805         if (cw < 1)
2806             cw = 1;
2807     }
2808
2809     if (edit->mark2 != edit->mark1)
2810         edit_push_markers (edit);
2811
2812     for (i = 1; i <= cw; i++)
2813     {
2814         if (edit->mark1 > edit->curs1)
2815         {
2816             edit->mark1--;
2817             edit->end_mark_curs--;
2818         }
2819         if (edit->mark2 > edit->curs1)
2820             edit->mark2--;
2821         if (edit->last_get_rule > edit->curs1)
2822             edit->last_get_rule--;
2823
2824         p = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2825                                                                  ((edit->curs2 -
2826                                                                    1) & M_EDIT_BUF_SIZE) - 1];
2827
2828         if (!(edit->curs2 & M_EDIT_BUF_SIZE))
2829         {
2830             g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
2831             edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = NULL;
2832         }
2833         edit->last_byte--;
2834         edit->curs2--;
2835         edit_push_undo_action (edit, p + 256);
2836     }
2837
2838     edit_modification (edit);
2839     if (p == '\n')
2840     {
2841         if (edit->book_mark)
2842             book_mark_dec (edit, edit->curs_line);
2843         edit->total_lines--;
2844         edit->force |= REDRAW_AFTER_CURSOR;
2845     }
2846     if (edit->curs1 < edit->start_display)
2847     {
2848         edit->start_display--;
2849         if (p == '\n')
2850             edit->start_line--;
2851     }
2852
2853     return p;
2854 }
2855
2856 /* --------------------------------------------------------------------------------------------- */
2857 /** moves the cursor right or left: increment positive or negative respectively */
2858
2859 void
2860 edit_cursor_move (WEdit * edit, long increment)
2861 {
2862     /* this is the same as a combination of two of the above routines, with only one push onto the undo stack */
2863     int c;
2864
2865     if (increment < 0)
2866     {
2867         for (; increment < 0; increment++)
2868         {
2869             if (!edit->curs1)
2870                 return;
2871
2872             edit_push_undo_action (edit, CURS_RIGHT);
2873
2874             c = edit_get_byte (edit, edit->curs1 - 1);
2875             if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
2876                 edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2877             edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2878                                                            (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
2879             edit->curs2++;
2880             c = edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE][(edit->curs1 -
2881                                                                       1) & M_EDIT_BUF_SIZE];
2882             if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE))
2883             {
2884                 g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
2885                 edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
2886             }
2887             edit->curs1--;
2888             if (c == '\n')
2889             {
2890                 edit->curs_line--;
2891                 edit->force |= REDRAW_LINE_BELOW;
2892             }
2893         }
2894
2895     }
2896     else if (increment > 0)
2897     {
2898         for (; increment > 0; increment--)
2899         {
2900             if (!edit->curs2)
2901                 return;
2902
2903             edit_push_undo_action (edit, CURS_LEFT);
2904
2905             c = edit_get_byte (edit, edit->curs1);
2906             if (!(edit->curs1 & M_EDIT_BUF_SIZE))
2907                 edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2908             edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE] = c;
2909             edit->curs1++;
2910             c = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2911                                                                      ((edit->curs2 -
2912                                                                        1) & M_EDIT_BUF_SIZE) - 1];
2913             if (!(edit->curs2 & M_EDIT_BUF_SIZE))
2914             {
2915                 g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
2916                 edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = 0;
2917             }
2918             edit->curs2--;
2919             if (c == '\n')
2920             {
2921                 edit->curs_line++;
2922                 edit->force |= REDRAW_LINE_ABOVE;
2923             }
2924         }
2925     }
2926 }
2927
2928 /* These functions return positions relative to lines */
2929
2930 /* --------------------------------------------------------------------------------------------- */
2931 /** returns index of last char on line + 1 */
2932
2933 long
2934 edit_eol (WEdit * edit, long current)
2935 {
2936     if (current >= edit->last_byte)
2937         return edit->last_byte;
2938
2939     for (;; current++)
2940         if (edit_get_byte (edit, current) == '\n')
2941             break;
2942     return current;
2943 }
2944
2945 /* --------------------------------------------------------------------------------------------- */
2946 /** returns index of first char on line */
2947
2948 long
2949 edit_bol (WEdit * edit, long current)
2950 {
2951     if (current <= 0)
2952         return 0;
2953
2954     for (;; current--)
2955         if (edit_get_byte (edit, current - 1) == '\n')
2956             break;
2957     return current;
2958 }
2959
2960 /* --------------------------------------------------------------------------------------------- */
2961
2962 long
2963 edit_count_lines (WEdit * edit, long current, long upto)
2964 {
2965     long lines = 0;
2966     if (upto > edit->last_byte)
2967         upto = edit->last_byte;
2968     if (current < 0)
2969         current = 0;
2970     while (current < upto)
2971         if (edit_get_byte (edit, current++) == '\n')
2972             lines++;
2973     return lines;
2974 }
2975
2976 /* --------------------------------------------------------------------------------------------- */
2977 /* If lines is zero this returns the count of lines from current to upto. */
2978 /* If upto is zero returns index of lines forward current. */
2979
2980 long
2981 edit_move_forward (WEdit * edit, long current, long lines, long upto)
2982 {
2983     if (upto)
2984     {
2985         return edit_count_lines (edit, current, upto);
2986     }
2987     else
2988     {
2989         long next;
2990         if (lines < 0)
2991             lines = 0;
2992         while (lines--)
2993         {
2994             next = edit_eol (edit, current) + 1;
2995             if (next > edit->last_byte)
2996                 break;
2997             else
2998                 current = next;
2999         }
3000         return current;
3001     }
3002 }
3003
3004 /* --------------------------------------------------------------------------------------------- */
3005 /** Returns offset of 'lines' lines up from current */
3006
3007 long
3008 edit_move_backward (WEdit * edit, long current, long lines)
3009 {
3010     if (lines < 0)
3011         lines = 0;
3012     current = edit_bol (edit, current);
3013     while ((lines--) && current != 0)
3014         current = edit_bol (edit, current - 1);
3015     return current;
3016 }
3017
3018 /* --------------------------------------------------------------------------------------------- */
3019 /* If cols is zero this returns the count of columns from current to upto. */
3020 /* If upto is zero returns index of cols across from current. */
3021
3022 long
3023 edit_move_forward3 (WEdit * edit, long current, int cols, long upto)
3024 {
3025     long p, q;
3026     int col;
3027
3028     if (upto)
3029     {
3030         q = upto;
3031         cols = -10;
3032     }
3033     else
3034         q = edit->last_byte + 2;
3035
3036     for (col = 0, p = current; p < q; p++)
3037     {
3038         int c, orig_c;
3039
3040         if (cols != -10)
3041         {
3042             if (col == cols)
3043                 return p;
3044             if (col > cols)
3045                 return p - 1;
3046         }
3047
3048         orig_c = c = edit_get_byte (edit, p);
3049
3050 #ifdef HAVE_CHARSET
3051         if (edit->utf8)
3052         {
3053             int utf_ch;
3054             int cw = 1;
3055
3056             utf_ch = edit_get_utf (edit, p, &cw);
3057             if (mc_global.utf8_display)
3058             {
3059                 if (cw > 1)
3060                     col -= cw - 1;
3061                 if (g_unichar_iswide (utf_ch))
3062                     col++;
3063             }
3064             else if (cw > 1 && g_unichar_isprint (utf_ch))
3065                 col -= cw - 1;
3066         }
3067
3068         c = convert_to_display_c (c);
3069 #endif
3070
3071         if (c == '\t')
3072             col += TAB_SIZE - col % TAB_SIZE;
3073         else if (c == '\n')
3074         {
3075             if (upto)
3076                 return col;
3077             else
3078                 return p;
3079         }
3080         else if ((c < 32 || c == 127) && (orig_c == c || (!mc_global.utf8_display && !edit->utf8)))
3081             /* '\r' is shown as ^M, so we must advance 2 characters */
3082             /* Caret notation for control characters */
3083             col += 2;
3084         else
3085             col++;
3086     }
3087     return col;
3088 }
3089
3090 /* --------------------------------------------------------------------------------------------- */
3091 /** returns the current column position of the cursor */
3092
3093 int
3094 edit_get_col (WEdit * edit)
3095 {
3096     return edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
3097 }
3098
3099 /* --------------------------------------------------------------------------------------------- */
3100 /* Scrolling functions */
3101 /* --------------------------------------------------------------------------------------------- */
3102
3103 void
3104 edit_update_curs_row (WEdit * edit)
3105 {
3106     edit->curs_row = edit->curs_line - edit->start_line;
3107 }
3108
3109 /* --------------------------------------------------------------------------------------------- */
3110
3111 void
3112 edit_update_curs_col (WEdit * edit)
3113 {
3114     edit->curs_col = edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
3115 }
3116
3117 /* --------------------------------------------------------------------------------------------- */
3118
3119 int
3120 edit_get_curs_col (const WEdit * edit)
3121 {
3122     return edit->curs_col;
3123 }
3124
3125 /* --------------------------------------------------------------------------------------------- */
3126 /** moves the display start position up by i lines */
3127
3128 void
3129 edit_scroll_upward (WEdit * edit, unsigned long i)
3130 {
3131     unsigned long lines_above = edit->start_line;
3132     if (i > lines_above)
3133         i = lines_above;
3134     if (i)
3135     {
3136         edit->start_line -= i;
3137         edit->start_display = edit_move_backward (edit, edit->start_display, i);
3138         edit->force |= REDRAW_PAGE;
3139         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3140     }
3141     edit_update_curs_row (edit);
3142 }
3143
3144
3145 /* --------------------------------------------------------------------------------------------- */
3146 /** returns 1 if could scroll, 0 otherwise */
3147
3148 void
3149 edit_scroll_downward (WEdit * edit, int i)
3150 {
3151     int lines_below;
3152     lines_below = edit->total_lines - edit->start_line - (edit->widget.lines - 1);
3153     if (lines_below > 0)
3154     {
3155         if (i > lines_below)
3156             i = lines_below;
3157         edit->start_line += i;
3158         edit->start_display = edit_move_forward (edit, edit->start_display, i, 0);
3159         edit->force |= REDRAW_PAGE;
3160         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3161     }
3162     edit_update_curs_row (edit);
3163 }
3164
3165 /* --------------------------------------------------------------------------------------------- */
3166
3167 void
3168 edit_scroll_right (WEdit * edit, int i)
3169 {
3170     edit->force |= REDRAW_PAGE;
3171     edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3172     edit->start_col -= i;
3173 }
3174
3175 /* --------------------------------------------------------------------------------------------- */
3176
3177 void
3178 edit_scroll_left (WEdit * edit, int i)
3179 {
3180     if (edit->start_col)
3181     {
3182         edit->start_col += i;
3183         if (edit->start_col > 0)
3184             edit->start_col = 0;
3185         edit->force |= REDRAW_PAGE;
3186         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3187     }
3188 }
3189
3190 /* --------------------------------------------------------------------------------------------- */
3191 /* high level cursor movement commands */
3192 /* --------------------------------------------------------------------------------------------- */
3193
3194 void
3195 edit_move_to_prev_col (WEdit * edit, long p)
3196 {
3197     int prev = edit->prev_col;
3198     int over = edit->over_col;
3199     edit_cursor_move (edit, edit_move_forward3 (edit, p, prev + edit->over_col, 0) - edit->curs1);
3200
3201     if (option_cursor_beyond_eol)
3202     {
3203         long line_len = edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0,
3204                                             edit_eol (edit, edit->curs1));
3205
3206         if (line_len < prev + edit->over_col)
3207         {
3208             edit->over_col = prev + over - line_len;
3209             edit->prev_col = line_len;
3210             edit->curs_col = line_len;
3211         }
3212         else
3213         {
3214             edit->curs_col = prev + over;
3215             edit->prev_col = edit->curs_col;
3216             edit->over_col = 0;
3217         }
3218     }
3219     else
3220     {
3221         edit->over_col = 0;
3222         if (is_in_indent (edit) && option_fake_half_tabs)
3223         {
3224             edit_update_curs_col (edit);
3225             if (space_width)
3226                 if (edit->curs_col % (HALF_TAB_SIZE * space_width))
3227                 {
3228                     int q = edit->curs_col;
3229                     edit->curs_col -= (edit->curs_col % (HALF_TAB_SIZE * space_width));
3230                     p = edit_bol (edit, edit->curs1);
3231                     edit_cursor_move (edit,
3232                                       edit_move_forward3 (edit, p, edit->curs_col,
3233                                                           0) - edit->curs1);
3234                     if (!left_of_four_spaces (edit))
3235                         edit_cursor_move (edit, edit_move_forward3 (edit, p, q, 0) - edit->curs1);
3236                 }
3237         }
3238     }
3239 }
3240
3241 /* --------------------------------------------------------------------------------------------- */
3242
3243 int
3244 line_is_blank (WEdit * edit, long line)
3245 {
3246     return is_blank (edit, edit_find_line (edit, line));
3247 }
3248
3249 /* --------------------------------------------------------------------------------------------- */
3250 /** move cursor to line 'line' */
3251
3252 void
3253 edit_move_to_line (WEdit * e, long line)
3254 {
3255     if (line < e->curs_line)
3256         edit_move_up (e, e->curs_line - line, 0);
3257     else
3258         edit_move_down (e, line - e->curs_line, 0);
3259     edit_scroll_screen_over_cursor (e);
3260 }
3261
3262 /* --------------------------------------------------------------------------------------------- */
3263 /** scroll window so that first visible line is 'line' */
3264
3265 void
3266 edit_move_display (WEdit * e, long line)
3267 {
3268     if (line < e->start_line)
3269         edit_scroll_upward (e, e->start_line - line);
3270     else
3271         edit_scroll_downward (e, line - e->start_line);
3272 }
3273
3274 /* --------------------------------------------------------------------------------------------- */
3275 /** save markers onto undo stack */
3276
3277 void
3278 edit_push_markers (WEdit * edit)
3279 {
3280     edit_push_undo_action (edit, MARK_1 + edit->mark1);
3281     edit_push_undo_action (edit, MARK_2 + edit->mark2);
3282     edit_push_undo_action (edit, MARK_CURS + edit->end_mark_curs);
3283 }
3284
3285 /* --------------------------------------------------------------------------------------------- */
3286
3287 void
3288 edit_set_markers (WEdit * edit, long m1, long m2, int c1, int c2)
3289 {
3290     edit->mark1 = m1;
3291     edit->mark2 = m2;
3292     edit->column1 = c1;
3293     edit->column2 = c2;
3294 }
3295
3296
3297 /* --------------------------------------------------------------------------------------------- */
3298 /** highlight marker toggle */
3299
3300 void
3301 edit_mark_cmd (WEdit * edit, int unmark)
3302 {
3303     edit_push_markers (edit);
3304     if (unmark)
3305     {
3306         edit_set_markers (edit, 0, 0, 0, 0);
3307         edit->force |= REDRAW_PAGE;
3308     }
3309     else
3310     {
3311         if (edit->mark2 >= 0)
3312         {
3313             edit->end_mark_curs = -1;
3314             edit_set_markers (edit, edit->curs1, -1, edit->curs_col + edit->over_col,
3315                               edit->curs_col + edit->over_col);
3316             edit->force |= REDRAW_PAGE;
3317         }
3318         else
3319         {
3320             edit->end_mark_curs = edit->curs1;
3321             edit_set_markers (edit, edit->mark1, edit->curs1, edit->column1,
3322                               edit->curs_col + edit->over_col);
3323         }
3324     }
3325 }
3326
3327 /* --------------------------------------------------------------------------------------------- */
3328 /** highlight the word under cursor */
3329
3330 void
3331 edit_mark_current_word_cmd (WEdit * edit)
3332 {
3333     long pos;
3334
3335     for (pos = edit->curs1; pos != 0; pos--)
3336     {
3337         int c1, c2;
3338
3339         c1 = edit_get_byte (edit, pos);
3340         c2 = edit_get_byte (edit, pos - 1);
3341         if (!isspace (c1) && isspace (c2))
3342             break;
3343         if ((my_type_of (c1) & my_type_of (c2)) == 0)
3344             break;
3345     }
3346     edit->mark1 = pos;
3347
3348     for (; pos < edit->last_byte; pos++)
3349     {
3350         int c1, c2;
3351
3352         c1 = edit_get_byte (edit, pos);
3353         c2 = edit_get_byte (edit, pos + 1);
3354         if (!isspace (c1) && isspace (c2))
3355             break;
3356         if ((my_type_of (c1) & my_type_of (c2)) == 0)
3357             break;
3358     }
3359     edit->mark2 = min (pos + 1, edit->last_byte);
3360
3361     edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
3362 }
3363
3364 /* --------------------------------------------------------------------------------------------- */
3365
3366 void
3367 edit_mark_current_line_cmd (WEdit * edit)
3368 {
3369     long pos = edit->curs1;
3370
3371     edit->mark1 = edit_bol (edit, pos);
3372     edit->mark2 = edit_eol (edit, pos);
3373
3374     edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
3375 }
3376
3377 /* --------------------------------------------------------------------------------------------- */
3378
3379 void
3380 edit_delete_line (WEdit * edit)
3381 {
3382     /*
3383      * Delete right part of the line.
3384      * Note that edit_get_byte() returns '\n' when byte position is
3385      *   beyond EOF.
3386      */
3387     while (edit_get_byte (edit, edit->curs1) != '\n')
3388     {
3389         (void) edit_delete (edit, 1);
3390     }
3391
3392     /*
3393      * Delete '\n' char.
3394      * Note that edit_delete() will not corrupt anything if called while
3395      *   cursor position is EOF.
3396      */
3397     (void) edit_delete (edit, 1);
3398
3399     /*
3400      * Delete left part of the line.
3401      * Note, that edit_get_byte() returns '\n' when byte position is < 0.
3402      */
3403     while (edit_get_byte (edit, edit->curs1 - 1) != '\n')
3404     {
3405         (void) edit_backspace (edit, 1);
3406     }
3407 }
3408
3409 /* --------------------------------------------------------------------------------------------- */
3410
3411 int
3412 edit_indent_width (WEdit * edit, long p)
3413 {
3414     long q = p;
3415     while (strchr ("\t ", edit_get_byte (edit, q)) && q < edit->last_byte - 1)  /* move to the end of the leading whitespace of the line */
3416         q++;
3417     return edit_move_forward3 (edit, p, 0, q);  /* count the number of columns of indentation */
3418 }
3419
3420 /* --------------------------------------------------------------------------------------------- */
3421
3422 void
3423 edit_insert_indent (WEdit * edit, int indent)
3424 {
3425     if (!option_fill_tabs_with_spaces)
3426     {
3427         while (indent >= TAB_SIZE)
3428         {
3429             edit_insert (edit, '\t');
3430             indent -= TAB_SIZE;
3431         }
3432     }
3433     while (indent-- > 0)
3434         edit_insert (edit, ' ');
3435 }
3436
3437 /* --------------------------------------------------------------------------------------------- */
3438
3439 void
3440 edit_push_key_press (WEdit * edit)
3441 {
3442     edit_push_undo_action (edit, KEY_PRESS + edit->start_display);
3443     if (edit->mark2 == -1)
3444     {
3445         edit_push_undo_action (edit, MARK_1 + edit->mark1);
3446         edit_push_undo_action (edit, MARK_CURS + edit->end_mark_curs);
3447     }
3448 }
3449
3450 /* --------------------------------------------------------------------------------------------- */
3451
3452 void
3453 edit_find_bracket (WEdit * edit)
3454 {
3455     edit->bracket = edit_get_bracket (edit, 1, 10000);
3456     if (last_bracket != edit->bracket)
3457         edit->force |= REDRAW_PAGE;
3458     last_bracket = edit->bracket;
3459 }
3460
3461 /* --------------------------------------------------------------------------------------------- */
3462 /**
3463  * This executes a command as though the user initiated it through a key
3464  * press.  Callback with WIDGET_KEY as a message calls this after
3465  * translating the key press.  This function can be used to pass any
3466  * command to the editor.  Note that the screen wouldn't update
3467  * automatically.  Either of command or char_for_insertion must be
3468  * passed as -1.  Commands are executed, and char_for_insertion is
3469  * inserted at the cursor.
3470  */
3471
3472 void
3473 edit_execute_key_command (WEdit * edit, unsigned long command, int char_for_insertion)
3474 {
3475     if (command == CK_MacroStartRecord || command == CK_RepeatStartRecord
3476         || (macro_index < 0
3477             && (command == CK_MacroStartStopRecord || command == CK_RepeatStartStopRecord)))
3478     {
3479         macro_index = 0;
3480         edit->force |= REDRAW_CHAR_ONLY | REDRAW_LINE;
3481         return;
3482     }
3483     if (macro_index != -1)
3484     {
3485         edit->force |= REDRAW_COMPLETELY;
3486         if (command == CK_MacroStopRecord || command == CK_MacroStartStopRecord)
3487         {
3488             edit_store_macro_cmd (edit);
3489             macro_index = -1;
3490             return;
3491         }
3492         else if (command == CK_RepeatStopRecord || command == CK_RepeatStartStopRecord)
3493         {
3494             edit_repeat_macro_cmd (edit);
3495             macro_index = -1;
3496             return;
3497         }
3498     }
3499
3500     if (macro_index >= 0 && macro_index < MAX_MACRO_LENGTH - 1)
3501     {
3502         record_macro_buf[macro_index].action = command;
3503         record_macro_buf[macro_index++].ch = char_for_insertion;
3504     }
3505     /* record the beginning of a set of editing actions initiated by a key press */
3506     if (command != CK_Undo && command != CK_ExtendedKeyMap)
3507         edit_push_key_press (edit);
3508
3509     edit_execute_cmd (edit, command, char_for_insertion);
3510     if (edit->column_highlight)
3511         edit->force |= REDRAW_PAGE;
3512 }
3513
3514 /* --------------------------------------------------------------------------------------------- */
3515 /**
3516    This executes a command at a lower level than macro recording.
3517    It also does not push a key_press onto the undo stack. This means
3518    that if it is called many times, a single undo command will undo
3519    all of them. It also does not check for the Undo command.
3520  */
3521 void
3522 edit_execute_cmd (WEdit * edit, unsigned long command, int char_for_insertion)
3523 {
3524     edit->force |= REDRAW_LINE;
3525
3526     /* The next key press will unhighlight the found string, so update
3527      * the whole page */
3528     if (edit->found_len || edit->column_highlight)
3529         edit->force |= REDRAW_PAGE;
3530
3531     switch (command)
3532     {
3533         /* a mark command with shift-arrow */
3534     case CK_MarkLeft:
3535     case CK_MarkRight:
3536     case CK_MarkToWordBegin:
3537     case CK_MarkToWordEnd:
3538     case CK_MarkToHome:
3539     case CK_MarkToEnd:
3540     case CK_MarkUp:
3541     case CK_MarkDown:
3542     case CK_MarkPageUp:
3543     case CK_MarkPageDown:
3544     case CK_MarkToFileBegin:
3545     case CK_MarkToFileEnd:
3546     case CK_MarkToPageBegin:
3547     case CK_MarkToPageEnd:
3548     case CK_MarkScrollUp:
3549     case CK_MarkScrollDown:
3550     case CK_MarkParagraphUp:
3551     case CK_MarkParagraphDown:
3552         /* a mark command with alt-arrow */
3553     case CK_MarkColumnPageUp:
3554     case CK_MarkColumnPageDown:
3555     case CK_MarkColumnLeft:
3556     case CK_MarkColumnRight:
3557     case CK_MarkColumnUp:
3558     case CK_MarkColumnDown:
3559     case CK_MarkColumnScrollUp:
3560     case CK_MarkColumnScrollDown:
3561     case CK_MarkColumnParagraphUp:
3562     case CK_MarkColumnParagraphDown:
3563         edit->column_highlight = 0;
3564         if (edit->highlight == 0 || (edit->mark2 != -1 && edit->mark1 != edit->mark2))
3565         {
3566             edit_mark_cmd (edit, 1);    /* clear */
3567             edit_mark_cmd (edit, 0);    /* marking on */
3568         }
3569         edit->highlight = 1;
3570         break;
3571
3572         /* any other command */
3573     default:
3574         if (edit->highlight)
3575             edit_mark_cmd (edit, 0);    /* clear */
3576         edit->highlight = 0;
3577     }
3578
3579     /* first check for undo */
3580     if (command == CK_Undo)
3581     {
3582         edit->redo_stack_reset = 0;
3583         edit_group_undo (edit);
3584         edit->found_len = 0;
3585         edit->prev_col = edit_get_col (edit);
3586         edit->search_start = edit->curs1;
3587         return;
3588     }
3589     /*  check for redo */
3590     if (command == CK_Redo)
3591     {
3592         edit->redo_stack_reset = 0;
3593         edit_do_redo (edit);
3594         edit->found_len = 0;
3595         edit->prev_col = edit_get_col (edit);
3596         edit->search_start = edit->curs1;
3597         return;
3598     }
3599
3600     edit->redo_stack_reset = 1;
3601
3602     /* An ordinary key press */
3603     if (char_for_insertion >= 0)
3604     {
3605         /* if non persistent selection and text selected */
3606         if (!option_persistent_selections)
3607         {
3608             if (edit->mark1 != edit->mark2)
3609                 edit_block_delete_cmd (edit);
3610         }
3611         if (edit->overwrite)
3612         {
3613             /* remove char only one time, after input first byte, multibyte chars */
3614             if ((!mc_global.utf8_display || edit->charpoint == 0)
3615                 && edit_get_byte (edit, edit->curs1) != '\n')
3616                 edit_delete (edit, 0);
3617         }
3618         if (option_cursor_beyond_eol && edit->over_col > 0)
3619             edit_insert_over (edit);
3620 #ifdef HAVE_CHARSET
3621         if (char_for_insertion > 255 && !mc_global.utf8_display)
3622         {
3623             unsigned char str[6 + 1];
3624             size_t i = 0;
3625             int res;
3626
3627             res = g_unichar_to_utf8 (char_for_insertion, (char *) str);
3628             if (res == 0)
3629             {
3630                 str[0] = '.';
3631                 str[1] = '\0';
3632             }
3633             else
3634             {
3635                 str[res] = '\0';
3636             }
3637             while (str[i] != 0 && i <= 6)
3638             {
3639                 char_for_insertion = str[i];
3640                 edit_insert (edit, char_for_insertion);
3641                 i++;
3642             }
3643         }
3644         else
3645 #endif
3646             edit_insert (edit, char_for_insertion);
3647
3648         if (option_auto_para_formatting)
3649         {
3650             format_paragraph (edit, 0);
3651             edit->force |= REDRAW_PAGE;
3652         }
3653         else
3654             check_and_wrap_line (edit);
3655         edit->found_len = 0;
3656         edit->prev_col = edit_get_col (edit);
3657         edit->search_start = edit->curs1;
3658         edit_find_bracket (edit);
3659         return;
3660     }
3661
3662     switch (command)
3663     {
3664     case CK_TopOnScreen:
3665     case CK_BottomOnScreen:
3666     case CK_Top:
3667     case CK_Bottom:
3668     case CK_PageUp:
3669     case CK_PageDown:
3670     case CK_Home:
3671     case CK_End:
3672     case CK_Up:
3673     case CK_Down:
3674     case CK_Left:
3675     case CK_Right:
3676     case CK_WordLeft:
3677     case CK_WordRight:
3678         if (edit->mark2 >= 0)
3679         {
3680             if (!option_persistent_selections)
3681             {
3682                 if (edit->column_highlight)
3683                     edit_push_undo_action (edit, COLUMN_ON);
3684                 edit->column_highlight = 0;
3685                 edit_mark_cmd (edit, 1);
3686             }
3687         }
3688     }
3689
3690     switch (command)
3691     {
3692     case CK_TopOnScreen:
3693     case CK_BottomOnScreen:
3694     case CK_MarkToPageBegin:
3695     case CK_MarkToPageEnd:
3696     case CK_Up:
3697     case CK_Down:
3698     case CK_WordLeft:
3699     case CK_WordRight:
3700     case CK_MarkToWordBegin:
3701     case CK_MarkToWordEnd:
3702     case CK_MarkUp:
3703     case CK_MarkDown:
3704     case CK_MarkColumnUp:
3705     case CK_MarkColumnDown:
3706         if (edit->mark2 == -1)
3707             break;              /*marking is following the cursor: may need to highlight a whole line */
3708     case CK_Left:
3709     case CK_Right:
3710     case CK_MarkLeft:
3711     case CK_MarkRight:
3712         edit->force |= REDRAW_CHAR_ONLY;
3713     }
3714
3715     /* basic cursor key commands */
3716     switch (command)
3717     {
3718     case CK_BackSpace:
3719         /* if non persistent selection and text selected */
3720         if (!option_persistent_selections)
3721         {
3722             if (edit->mark1 != edit->mark2)
3723             {
3724                 edit_block_delete_cmd (edit);
3725                 break;
3726             }
3727         }
3728         if (option_cursor_beyond_eol && edit->over_col > 0)
3729         {
3730             edit->over_col--;
3731             break;
3732         }
3733         if (option_backspace_through_tabs && is_in_indent (edit))
3734         {
3735             while (edit_get_byte (edit, edit->curs1 - 1) != '\n' && edit->curs1 > 0)
3736                 edit_backspace (edit, 1);
3737             break;
3738         }
3739         else
3740         {
3741             if (option_fake_half_tabs)
3742             {
3743                 int i;
3744                 if (is_in_indent (edit) && right_of_four_spaces (edit))
3745                 {
3746                     for (i = 0; i < HALF_TAB_SIZE; i++)
3747                         edit_backspace (edit, 1);
3748                     break;
3749                 }
3750             }
3751         }
3752         edit_backspace (edit, 0);
3753         break;
3754     case CK_Delete:
3755         /* if non persistent selection and text selected */
3756         if (!option_persistent_selections)
3757         {
3758             if (edit->mark1 != edit->mark2)
3759             {
3760                 edit_block_delete_cmd (edit);
3761                 break;
3762             }
3763         }
3764
3765         if (option_cursor_beyond_eol && edit->over_col > 0)
3766             edit_insert_over (edit);
3767
3768         if (option_fake_half_tabs)
3769         {
3770             int i;
3771             if (is_in_indent (edit) && left_of_four_spaces (edit))
3772             {
3773                 for (i = 1; i <= HALF_TAB_SIZE; i++)
3774                     edit_delete (edit, 1);
3775                 break;
3776             }
3777         }
3778         edit_delete (edit, 0);
3779         break;
3780     case CK_DeleteToWordBegin:
3781         edit->over_col = 0;
3782         edit_left_delete_word (edit);
3783         break;
3784     case CK_DeleteToWordEnd:
3785         if (option_cursor_beyond_eol && edit->over_col > 0)
3786             edit_insert_over (edit);
3787
3788         edit_right_delete_word (edit);
3789         break;
3790     case CK_DeleteLine:
3791         edit_delete_line (edit);
3792         break;
3793     case CK_DeleteToHome:
3794         edit_delete_to_line_begin (edit);
3795         break;
3796     case CK_DeleteToEnd:
3797         edit_delete_to_line_end (edit);
3798         break;
3799     case CK_Enter:
3800         edit->over_col = 0;
3801         if (option_auto_para_formatting)
3802         {
3803             edit_double_newline (edit);
3804             if (option_return_does_auto_indent)
3805                 edit_auto_indent (edit);
3806             format_paragraph (edit, 0);
3807         }
3808         else
3809         {
3810             edit_insert (edit, '\n');
3811             if (option_return_does_auto_indent)
3812             {
3813                 edit_auto_indent (edit);
3814             }
3815         }
3816         break;
3817     case CK_Return:
3818         edit_insert (edit, '\n');
3819         break;
3820
3821     case CK_MarkColumnPageUp:
3822         edit->column_highlight = 1;
3823     case CK_PageUp:
3824     case CK_MarkPageUp:
3825         edit_move_up (edit, edit->widget.lines - 1, 1);
3826         break;
3827     case CK_MarkColumnPageDown:
3828         edit->column_highlight = 1;
3829     case CK_PageDown:
3830     case CK_MarkPageDown:
3831         edit_move_down (edit, edit->widget.lines - 1, 1);
3832         break;
3833     case CK_MarkColumnLeft:
3834         edit->column_highlight = 1;
3835     case CK_Left:
3836     case CK_MarkLeft:
3837         if (option_fake_half_tabs)
3838         {
3839             if (is_in_indent (edit) && right_of_four_spaces (edit))
3840             {
3841                 if (option_cursor_beyond_eol && edit->over_col > 0)
3842                     edit->over_col--;
3843                 else
3844                     edit_cursor_move (edit, -HALF_TAB_SIZE);
3845                 edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
3846                 break;
3847             }
3848         }
3849         edit_left_char_move_cmd (edit);
3850         break;
3851     case CK_MarkColumnRight:
3852         edit->column_highlight = 1;
3853     case CK_Right:
3854     case CK_MarkRight:
3855         if (option_fake_half_tabs)
3856         {
3857             if (is_in_indent (edit) && left_of_four_spaces (edit))
3858             {
3859                 edit_cursor_move (edit, HALF_TAB_SIZE);
3860                 edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
3861                 break;
3862             }
3863         }
3864         edit_right_char_move_cmd (edit);
3865         break;
3866     case CK_TopOnScreen:
3867     case CK_MarkToPageBegin:
3868         edit_begin_page (edit);
3869         break;
3870     case CK_BottomOnScreen:
3871     case CK_MarkToPageEnd:
3872         edit_end_page (edit);
3873         break;
3874     case CK_WordLeft:
3875     case CK_MarkToWordBegin:
3876         edit->over_col = 0;
3877         edit_left_word_move_cmd (edit);
3878         break;
3879     case CK_WordRight:
3880     case CK_MarkToWordEnd:
3881         edit->over_col = 0;
3882         edit_right_word_move_cmd (edit);
3883         break;
3884     case CK_MarkColumnUp:
3885         edit->column_highlight = 1;
3886     case CK_Up:
3887     case CK_MarkUp:
3888         edit_move_up (edit, 1, 0);
3889         break;
3890     case CK_MarkColumnDown:
3891         edit->column_highlight = 1;
3892     case CK_Down:
3893     case CK_MarkDown:
3894         edit_move_down (edit, 1, 0);
3895         break;
3896     case CK_MarkColumnParagraphUp:
3897         edit->column_highlight = 1;
3898     case CK_ParagraphUp:
3899     case CK_MarkParagraphUp:
3900         edit_move_up_paragraph (edit, 0);
3901         break;
3902     case CK_MarkColumnParagraphDown:
3903         edit->column_highlight = 1;
3904     case CK_ParagraphDown:
3905     case CK_MarkParagraphDown:
3906         edit_move_down_paragraph (edit, 0);
3907         break;
3908     case CK_MarkColumnScrollUp:
3909         edit->column_highlight = 1;
3910     case CK_ScrollUp:
3911     case CK_MarkScrollUp:
3912         edit_move_up (edit, 1, 1);
3913         break;
3914     case CK_MarkColumnScrollDown:
3915         edit->column_highlight = 1;
3916     case CK_ScrollDown:
3917     case CK_MarkScrollDown:
3918         edit_move_down (edit, 1, 1);
3919         break;
3920     case CK_Home:
3921     case CK_MarkToHome:
3922         edit_cursor_to_bol (edit);
3923         break;
3924     case CK_End:
3925     case CK_MarkToEnd:
3926         edit_cursor_to_eol (edit);
3927         break;
3928     case CK_Tab:
3929         /* if text marked shift block */
3930         if (edit->mark1 != edit->mark2 && !option_persistent_selections)
3931         {
3932             if (edit->mark2 < 0)
3933                 edit_mark_cmd (edit, 0);
3934             edit_move_block_to_right (edit);
3935         }
3936         else
3937         {
3938             if (option_cursor_beyond_eol)
3939                 edit_insert_over (edit);
3940             edit_tab_cmd (edit);
3941             if (option_auto_para_formatting)
3942             {
3943                 format_paragraph (edit, 0);
3944                 edit->force |= REDRAW_PAGE;
3945             }
3946             else
3947             {
3948                 check_and_wrap_line (edit);
3949             }
3950         }
3951         break;
3952
3953     case CK_InsertOverwrite:
3954         edit->overwrite = !edit->overwrite;
3955         break;
3956
3957     case CK_Mark:
3958         if (edit->mark2 >= 0)
3959         {
3960             if (edit->column_highlight)
3961                 edit_push_undo_action (edit, COLUMN_ON);
3962             edit->column_highlight = 0;
3963         }
3964         edit_mark_cmd (edit, 0);
3965         break;
3966     case CK_MarkColumn:
3967         if (!edit->column_highlight)
3968             edit_push_undo_action (edit, COLUMN_OFF);
3969         edit->column_highlight = 1;
3970         edit_mark_cmd (edit, 0);
3971         break;
3972     case CK_MarkAll:
3973         edit_set_markers (edit, 0, edit->last_byte, 0, 0);
3974         edit->force |= REDRAW_PAGE;
3975         break;
3976     case CK_Unmark:
3977         if (edit->column_highlight)
3978             edit_push_undo_action (edit, COLUMN_ON);
3979         edit->column_highlight = 0;
3980         edit_mark_cmd (edit, 1);
3981         break;
3982     case CK_MarkWord:
3983         if (edit->column_highlight)
3984             edit_push_undo_action (edit, COLUMN_ON);
3985         edit->column_highlight = 0;
3986         edit_mark_current_word_cmd (edit);
3987         break;
3988     case CK_MarkLine:
3989         if (edit->column_highlight)
3990             edit_push_undo_action (edit, COLUMN_ON);
3991         edit->column_highlight = 0;
3992         edit_mark_current_line_cmd (edit);
3993         break;
3994
3995     case CK_ShowNumbers:
3996         option_line_state = !option_line_state;
3997         option_line_state_width = option_line_state ? LINE_STATE_WIDTH : 0;
3998         edit->force |= REDRAW_PAGE;
3999         break;
4000
4001     case CK_ShowMargin:
4002         show_right_margin = !show_right_margin;
4003         edit->force |= REDRAW_PAGE;
4004         break;
4005
4006     case CK_Bookmark:
4007         book_mark_clear (edit, edit->curs_line, BOOK_MARK_FOUND_COLOR);
4008         if (book_mark_query_color (edit, edit->curs_line, BOOK_MARK_COLOR))
4009             book_mark_clear (edit, edit->curs_line, BOOK_MARK_COLOR);
4010         else
4011             book_mark_insert (edit, edit->curs_line, BOOK_MARK_COLOR);
4012         break;
4013     case CK_BookmarkFlush:
4014         book_mark_flush (edit, BOOK_MARK_COLOR);
4015         book_mark_flush (edit, BOOK_MARK_FOUND_COLOR);
4016         edit->force |= REDRAW_PAGE;
4017         break;
4018     case CK_BookmarkNext:
4019         if (edit->book_mark)
4020         {
4021             struct _book_mark *p;
4022             p = (struct _book_mark *) book_mark_find (edit, edit->curs_line);
4023             if (p->next)
4024             {
4025                 p = p->next;
4026                 if (p->line >= edit->start_line + edit->widget.lines || p->line < edit->start_line)
4027                     edit_move_display (edit, p->line - edit->widget.lines / 2);
4028                 edit_move_to_line (edit, p->line);
4029             }
4030         }
4031         break;
4032     case CK_BookmarkPrev:
4033         if (edit->book_mark)
4034         {
4035             struct _book_mark *p;
4036             p = (struct _book_mark *) book_mark_find (edit, edit->curs_line);
4037             while (p->line == edit->curs_line)
4038                 if (p->prev)
4039                     p = p->prev;
4040             if (p->line >= 0)
4041             {
4042                 if (p->line >= edit->start_line + edit->widget.lines || p->line < edit->start_line)
4043                     edit_move_display (edit, p->line - edit->widget.lines / 2);
4044                 edit_move_to_line (edit, p->line);
4045             }
4046         }
4047         break;
4048
4049     case CK_Top:
4050     case CK_MarkToFileBegin:
4051         edit_move_to_top (edit);
4052         break;
4053     case CK_Bottom:
4054     case CK_MarkToFileEnd:
4055         edit_move_to_bottom (edit);
4056         break;
4057
4058     case CK_Copy:
4059         if (option_cursor_beyond_eol && edit->over_col > 0)
4060             edit_insert_over (edit);
4061         edit_block_copy_cmd (edit);
4062         break;
4063     case CK_Remove:
4064         edit_block_delete_cmd (edit);
4065         break;
4066     case CK_Move:
4067         edit_block_move_cmd (edit);
4068         break;
4069
4070     case CK_BlockShiftLeft:
4071         if (edit->mark1 != edit->mark2)
4072             edit_move_block_to_left (edit);
4073         break;
4074     case CK_BlockShiftRight:
4075         if (edit->mark1 != edit->mark2)
4076             edit_move_block_to_right (edit);
4077         break;
4078     case CK_Store:
4079         edit_copy_to_X_buf_cmd (edit);
4080         break;
4081     case CK_Cut:
4082         edit_cut_to_X_buf_cmd (edit);
4083         break;
4084     case CK_Paste:
4085         /* if non persistent selection and text selected */
4086         if (!option_persistent_selections)
4087         {
4088             if (edit->mark1 != edit->mark2)
4089                 edit_block_delete_cmd (edit);
4090         }
4091         if (option_cursor_beyond_eol && edit->over_col > 0)
4092             edit_insert_over (edit);
4093         edit_paste_from_X_buf_cmd (edit);
4094         break;
4095     case CK_History:
4096         edit_paste_from_history (edit);
4097         break;
4098
4099     case CK_SaveAs:
4100         edit_save_as_cmd (edit);
4101         break;
4102     case CK_Save:
4103         edit_save_confirm_cmd (edit);
4104         break;
4105     case CK_EditFile:
4106         edit_load_cmd (edit, EDIT_FILE_COMMON);
4107         break;
4108     case CK_BlockSave:
4109         edit_save_block_cmd (edit);
4110         break;
4111     case CK_InsertFile:
4112         edit_insert_file_cmd (edit);
4113         break;
4114
4115     case CK_FilePrev:
4116         edit_load_back_cmd (edit);
4117         break;
4118     case CK_FileNext:
4119         edit_load_forward_cmd (edit);
4120         break;
4121
4122     case CK_EditSyntaxFile:
4123         edit_load_cmd (edit, EDIT_FILE_SYNTAX);
4124         break;
4125     case CK_SyntaxChoose:
4126         edit_syntax_dialog (edit);
4127         break;
4128
4129     case CK_EditUserMenu:
4130         edit_load_cmd (edit, EDIT_FILE_MENU);
4131         break;
4132
4133     case CK_SyntaxOnOff:
4134         option_syntax_highlighting ^= 1;
4135         if (option_syntax_highlighting == 1)
4136             edit_load_syntax (edit, NULL, edit->syntax_type);
4137         edit->force |= REDRAW_PAGE;
4138         break;
4139
4140     case CK_ShowTabTws:
4141         enable_show_tabs_tws ^= 1;
4142         edit->force |= REDRAW_PAGE;
4143         break;
4144
4145     case CK_Search:
4146         edit_search_cmd (edit, FALSE);
4147         break;
4148     case CK_SearchContinue:
4149         edit_search_cmd (edit, TRUE);
4150         break;
4151     case CK_Replace:
4152         edit_replace_cmd (edit, 0);
4153         break;
4154     case CK_ReplaceContinue:
4155         edit_replace_cmd (edit, 1);
4156         break;
4157     case CK_Complete:
4158         /* if text marked shift block */
4159         if (edit->mark1 != edit->mark2 && !option_persistent_selections)
4160         {
4161             edit_move_block_to_left (edit);
4162         }
4163         else
4164         {
4165             edit_complete_word_cmd (edit);
4166         }
4167         break;
4168     case CK_Find:
4169         edit_get_match_keyword_cmd (edit);
4170         break;
4171     case CK_Quit:
4172         dlg_stop (edit->widget.owner);
4173         break;
4174     case CK_EditNew:
4175         edit_new_cmd (edit);
4176         break;
4177     case CK_Help:
4178         edit_help_cmd (edit);
4179         break;
4180     case CK_Refresh:
4181         edit_refresh_cmd (edit);
4182         break;
4183     case CK_SaveSetup:
4184         save_setup_cmd ();
4185         break;
4186     case CK_About:
4187         edit_about ();
4188         break;
4189     case CK_LearnKeys:
4190         learn_keys ();
4191         break;
4192     case CK_Options:
4193         edit_options_dialog (edit);
4194         break;
4195     case CK_OptionsSaveMode:
4196         menu_save_mode_cmd ();
4197         break;
4198     case CK_Date:
4199         {
4200             char s[BUF_MEDIUM];
4201             /* fool gcc to prevent a Y2K warning */
4202             char time_format[] = "_c";
4203             time_format[0] = '%';
4204
4205             FMT_LOCALTIME_CURRENT (s, sizeof (s), time_format);
4206             edit_print_string (edit, s);
4207             edit->force |= REDRAW_PAGE;
4208             break;
4209         }
4210         break;
4211     case CK_Goto:
4212         edit_goto_cmd (edit);
4213         break;
4214     case CK_ParagraphFormat:
4215         format_paragraph (edit, 1);
4216         edit->force |= REDRAW_PAGE;
4217         break;
4218     case CK_MacroDelete:
4219         edit_delete_macro_cmd (edit);
4220         break;
4221     case CK_MatchBracket:
4222         edit_goto_matching_bracket (edit);
4223         break;
4224     case CK_UserMenu:
4225         user_menu (edit, NULL, -1);
4226         break;
4227     case CK_Sort:
4228         edit_sort_cmd (edit);
4229         break;
4230     case CK_ExternalCommand:
4231         edit_ext_cmd (edit);
4232         break;
4233     case CK_Mail:
4234         edit_mail_dialog (edit);
4235         break;
4236     case CK_Shell:
4237         view_other_cmd ();
4238         break;
4239 #ifdef HAVE_CHARSET
4240     case CK_SelectCodepage:
4241         edit_select_codepage_cmd (edit);
4242         break;
4243 #endif
4244     case CK_InsertLiteral:
4245         edit_insert_literal_cmd (edit);
4246         break;
4247     case CK_MacroStartStopRecord:
4248         edit_begin_end_macro_cmd (edit);
4249         break;
4250     case CK_RepeatStartStopRecord:
4251         edit_begin_end_repeat_cmd (edit);
4252         break;
4253     case CK_ExtendedKeyMap:
4254         edit->extmod = TRUE;
4255         break;
4256     default:
4257         break;
4258     }
4259
4260     /* CK_PipeBlock */
4261     if ((command / CK_PipeBlock (0)) == 1)
4262         edit_block_process_cmd (edit, command - CK_PipeBlock (0));
4263
4264     /* keys which must set the col position, and the search vars */
4265     switch (command)
4266     {
4267     case CK_Search:
4268     case CK_SearchContinue:
4269     case CK_Replace:
4270     case CK_ReplaceContinue:
4271     case CK_Complete:
4272         edit->prev_col = edit_get_col (edit);
4273         break;
4274     case CK_Up:
4275     case CK_MarkUp:
4276     case CK_MarkColumnUp:
4277     case CK_Down:
4278     case CK_MarkDown:
4279     case CK_MarkColumnDown:
4280     case CK_PageUp:
4281     case CK_MarkPageUp:
4282     case CK_MarkColumnPageUp:
4283     case CK_PageDown:
4284     case CK_MarkPageDown:
4285     case CK_MarkColumnPageDown:
4286     case CK_Top:
4287     case CK_MarkToFileBegin:
4288     case CK_Bottom:
4289     case CK_MarkToFileEnd:
4290     case CK_ParagraphUp:
4291     case CK_MarkParagraphUp:
4292     case CK_MarkColumnParagraphUp:
4293     case CK_ParagraphDown:
4294     case CK_MarkParagraphDown:
4295     case CK_MarkColumnParagraphDown:
4296     case CK_ScrollUp:
4297     case CK_MarkScrollUp:
4298     case CK_MarkColumnScrollUp:
4299     case CK_ScrollDown:
4300     case CK_MarkScrollDown:
4301     case CK_MarkColumnScrollDown:
4302         edit->search_start = edit->curs1;
4303         edit->found_len = 0;
4304         break;
4305     default:
4306         edit->found_len = 0;
4307         edit->prev_col = edit_get_col (edit);
4308         edit->search_start = edit->curs1;
4309     }
4310     edit_find_bracket (edit);
4311
4312     if (option_auto_para_formatting)
4313     {
4314         switch (command)
4315         {
4316         case CK_BackSpace:
4317         case CK_Delete:
4318         case CK_DeleteToWordBegin:
4319         case CK_DeleteToWordEnd:
4320         case CK_DeleteToHome:
4321         case CK_DeleteToEnd:
4322             format_paragraph (edit, 0);
4323             edit->force |= REDRAW_PAGE;
4324         }
4325     }
4326 }
4327
4328 /* --------------------------------------------------------------------------------------------- */
4329
4330 void
4331 edit_stack_init (void)
4332 {
4333     for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
4334     {
4335         edit_history_moveto[edit_stack_iterator].filename = NULL;
4336         edit_history_moveto[edit_stack_iterator].line = -1;
4337     }
4338
4339     edit_stack_iterator = 0;
4340 }
4341
4342 /* --------------------------------------------------------------------------------------------- */
4343
4344 void
4345 edit_stack_free (void)
4346 {
4347     for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
4348         g_free (edit_history_moveto[edit_stack_iterator].filename);
4349 }
4350
4351 /* --------------------------------------------------------------------------------------------- */
4352 /** move i lines */
4353
4354 void
4355 edit_move_up (WEdit * edit, unsigned long i, int do_scroll)
4356 {
4357     edit_move_updown (edit, i, do_scroll, TRUE);
4358 }
4359
4360 /* --------------------------------------------------------------------------------------------- */
4361 /** move i lines */
4362
4363 void
4364 edit_move_down (WEdit * edit, unsigned long i, int do_scroll)
4365 {
4366     edit_move_updown (edit, i, do_scroll, FALSE);
4367 }
4368
4369 /* --------------------------------------------------------------------------------------------- */
4370
4371 unsigned int
4372 edit_unlock_file (WEdit * edit)
4373 {
4374     char *fullpath;
4375     unsigned int ret;
4376
4377     fullpath = mc_build_filename (edit->dir, edit->filename, (char *) NULL);
4378     ret = unlock_file (fullpath);
4379     g_free (fullpath);
4380
4381     return ret;
4382 }
4383
4384 /* --------------------------------------------------------------------------------------------- */
4385
4386 unsigned int
4387 edit_lock_file (WEdit * edit)
4388 {
4389     char *fullpath;
4390     unsigned int ret;
4391
4392     fullpath = mc_build_filename (edit->dir, edit->filename, (char *) NULL);
4393     ret = lock_file (fullpath);
4394     g_free (fullpath);
4395
4396     return ret;
4397 }
4398
4399 /* --------------------------------------------------------------------------------------------- */