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