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