src/editor/edit.c

   1 /*
   2    Editor low level data handling and cursor fundamentals.
   3
   4    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   5    2007, 2008, 2009, 2010, 2011, 2012
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Paul Sheer 1996, 1997
  10    Ilia Maslakov <il.smind@gmail.com> 2009, 2010, 2011
  11    Andrew Borodin <aborodin@vmail.ru> 2012.
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29 /** \file
  30  *  \brief Source: editor low level data handling and cursor fundamentals
  31  *  \author Paul Sheer
  32  *  \date 1996, 1997
  33  */
  34
  35 #include <config.h>
  36 #include <stdio.h>
  37 #include <stdarg.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <sys/stat.h>
  44 #include <stdlib.h>
  45 #include <fcntl.h>
  46
  47 #include "lib/global.h"
  48
  49 #include "lib/tty/color.h"
  50 #include "lib/tty/tty.h"        /* attrset() */
  51 #include "lib/tty/key.h"        /* is_idle() */
  52 #include "lib/skin.h"           /* EDITOR_NORMAL_COLOR */
  53 #include "lib/vfs/vfs.h"
  54 #include "lib/strutil.h"        /* utf string functions */
  55 #include "lib/util.h"           /* load_file_position(), save_file_position() */
  56 #include "lib/timefmt.h"        /* time formatting */
  57 #include "lib/lock.h"
  58 #include "lib/widget.h"
  59
  60 #ifdef HAVE_CHARSET
  61 #include "lib/charsets.h"       /* get_codepage_id */
  62 #endif
  63
  64 #include "src/filemanager/usermenu.h"   /* user_menu_cmd() */
  65
  66 #include "src/setup.h"          /* option_tab_spacing */
  67 #include "src/learn.h"          /* learn_keys */
  68 #include "src/keybind-defaults.h"
  69
  70 #include "edit-impl.h"
  71 #include "editwidget.h"
  72 #ifdef HAVE_ASPELL
  73 #include "spell.h"
  74 #endif
  75
  76 /*** global variables ****************************************************************************/
  77
  78 int option_word_wrap_line_length = DEFAULT_WRAP_LINE_LENGTH;
  79 int option_typewriter_wrap = 0;
  80 int option_auto_para_formatting = 0;
  81 int option_fill_tabs_with_spaces = 0;
  82 int option_return_does_auto_indent = 1;
  83 int option_backspace_through_tabs = 0;
  84 int option_fake_half_tabs = 1;
  85 int option_save_mode = EDIT_QUICK_SAVE;
  86 int option_save_position = 1;
  87 int option_max_undo = 32768;
  88 int option_persistent_selections = 1;
  89 int option_cursor_beyond_eol = 0;
  90 int option_line_state = 0;
  91 int option_line_state_width = 0;
  92 gboolean option_cursor_after_inserted_block = FALSE;
  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  * @return 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   * @return 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 - (WIDGET (edit)->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 (const 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 (const 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 (const 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 (const 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 (!edit_line_is_blank (edit, edit->curs_line))
 835         {
 836             for (i = edit->curs_line - 1; i != 0; i--)
 837                 if (edit_line_is_blank (edit, i))
 838                     break;
 839         }
 840         else if (edit_line_is_blank (edit, edit->curs_line - 1))
 841         {
 842             for (i = edit->curs_line - 1; i != 0; i--)
 843                 if (!edit_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 (edit_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 (!edit_line_is_blank (edit, edit->curs_line))
 872     {
 873         for (i = edit->curs_line + 1; i != 0; i++)
 874             if (edit_line_is_blank (edit, i) || i >= edit->total_lines)
 875                 break;
 876     }
 877     else if (edit_line_is_blank (edit, edit->curs_line + 1))
 878     {
 879         for (i = edit->curs_line + 1; i != 0; i++)
 880             if (!edit_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 (edit_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, WIDGET (edit)->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, WIDGET (edit)->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 == 0)
 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     while (TRUE)
1019     {
1020         int c1, c2;
1021
1022         if (edit->column_highlight
1023             && edit->mark1 != edit->mark2
1024             && edit->over_col == 0 && edit->curs1 == edit_bol (edit, edit->curs1))
1025             break;
1026         edit_cursor_move (edit, -1);
1027         if (edit->curs1 == 0)
1028             break;
1029         c1 = edit_get_byte (edit, edit->curs1 - 1);
1030         c2 = edit_get_byte (edit, edit->curs1);
1031         if (c1 == '\n' || c2 == '\n')
1032             break;
1033         if ((my_type_of (c1) & my_type_of (c2)) == 0)
1034             break;
1035         if (isspace (c1) && !isspace (c2))
1036             break;
1037         if (s != 0 && !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     while (TRUE)
1057     {
1058         int c1, c2;
1059
1060         if (edit->column_highlight
1061             && edit->mark1 != edit->mark2
1062             && edit->over_col == 0 && edit->curs1 == edit_eol (edit, edit->curs1))
1063             break;
1064         edit_cursor_move (edit, 1);
1065         if (edit->curs1 >= edit->last_byte)
1066             break;
1067         c1 = edit_get_byte (edit, edit->curs1 - 1);
1068         c2 = edit_get_byte (edit, edit->curs1);
1069         if (c1 == '\n' || c2 == '\n')
1070             break;
1071         if ((my_type_of (c1) & my_type_of (c2)) == 0)
1072             break;
1073         if (isspace (c1) && !isspace (c2))
1074             break;
1075         if (s != 0 && !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     while (edit->curs1 < edit->last_byte)
1199     {
1200         int c1, c2;
1201
1202         c1 = edit_delete (edit, TRUE);
1203         c2 = edit_get_byte (edit, edit->curs1);
1204         if (c1 == '\n' || c2 == '\n')
1205             break;
1206         if ((isspace (c1) == 0) != (isspace (c2) == 0))
1207             break;
1208         if ((my_type_of (c1) & my_type_of (c2)) == 0)
1209             break;
1210     }
1211 }
1212
1213 /* --------------------------------------------------------------------------------------------- */
1214
1215 static void
1216 edit_left_delete_word (WEdit * edit)
1217 {
1218     while (edit->curs1 > 0)
1219     {
1220         int c1, c2;
1221
1222         c1 = edit_backspace (edit, TRUE);
1223         c2 = edit_get_byte (edit, edit->curs1 - 1);
1224         if (c1 == '\n' || c2 == '\n')
1225             break;
1226         if ((isspace (c1) == 0) != (isspace (c2) == 0))
1227             break;
1228         if ((my_type_of (c1) & my_type_of (c2)) == 0)
1229             break;
1230     }
1231 }
1232
1233 /* --------------------------------------------------------------------------------------------- */
1234 /**
1235    the start column position is not recorded, and hence does not
1236    undo as it happed. But who would notice.
1237  */
1238
1239 static void
1240 edit_do_undo (WEdit * edit)
1241 {
1242     long ac;
1243     long count = 0;
1244
1245     edit->undo_stack_disable = 1;       /* don't record undo's onto undo stack! */
1246     edit->over_col = 0;
1247     while ((ac = edit_pop_undo_action (edit)) < KEY_PRESS)
1248     {
1249         switch ((int) ac)
1250         {
1251         case STACK_BOTTOM:
1252             goto done_undo;
1253         case CURS_RIGHT:
1254             edit_cursor_move (edit, 1);
1255             break;
1256         case CURS_LEFT:
1257             edit_cursor_move (edit, -1);
1258             break;
1259         case BACKSPACE:
1260         case BACKSPACE_BR:
1261             edit_backspace (edit, TRUE);
1262             break;
1263         case DELCHAR:
1264         case DELCHAR_BR:
1265             edit_delete (edit, TRUE);
1266             break;
1267         case COLUMN_ON:
1268             edit->column_highlight = 1;
1269             break;
1270         case COLUMN_OFF:
1271             edit->column_highlight = 0;
1272             break;
1273         }
1274         if (ac >= 256 && ac < 512)
1275             edit_insert_ahead (edit, ac - 256);
1276         if (ac >= 0 && ac < 256)
1277             edit_insert (edit, ac);
1278
1279         if (ac >= MARK_1 - 2 && ac < MARK_2 - 2)
1280         {
1281             edit->mark1 = ac - MARK_1;
1282             edit->column1 =
1283                 (long) edit_move_forward3 (edit, edit_bol (edit, edit->mark1), 0, edit->mark1);
1284         }
1285         if (ac >= MARK_2 - 2 && ac < MARK_CURS - 2)
1286         {
1287             edit->mark2 = ac - MARK_2;
1288             edit->column2 =
1289                 (long) edit_move_forward3 (edit, edit_bol (edit, edit->mark2), 0, edit->mark2);
1290         }
1291         else if (ac >= MARK_CURS - 2 && ac < KEY_PRESS)
1292         {
1293             edit->end_mark_curs = ac - MARK_CURS;
1294         }
1295         if (count++)
1296             edit->force |= REDRAW_PAGE; /* more than one pop usually means something big */
1297     }
1298
1299     if (edit->start_display > ac - KEY_PRESS)
1300     {
1301         edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
1302         edit->force |= REDRAW_PAGE;
1303     }
1304     else if (edit->start_display < ac - KEY_PRESS)
1305     {
1306         edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
1307         edit->force |= REDRAW_PAGE;
1308     }
1309     edit->start_display = ac - KEY_PRESS;       /* see push and pop above */
1310     edit_update_curs_row (edit);
1311
1312   done_undo:
1313     edit->undo_stack_disable = 0;
1314 }
1315
1316 /* --------------------------------------------------------------------------------------------- */
1317
1318 static void
1319 edit_do_redo (WEdit * edit)
1320 {
1321     long ac;
1322     long count = 0;
1323
1324     if (edit->redo_stack_reset)
1325         return;
1326
1327     edit->over_col = 0;
1328     while ((ac = edit_pop_redo_action (edit)) < KEY_PRESS)
1329     {
1330         switch ((int) ac)
1331         {
1332         case STACK_BOTTOM:
1333             goto done_redo;
1334         case CURS_RIGHT:
1335             edit_cursor_move (edit, 1);
1336             break;
1337         case CURS_LEFT:
1338             edit_cursor_move (edit, -1);
1339             break;
1340         case BACKSPACE:
1341             edit_backspace (edit, TRUE);
1342             break;
1343         case DELCHAR:
1344             edit_delete (edit, TRUE);
1345             break;
1346         case COLUMN_ON:
1347             edit->column_highlight = 1;
1348             break;
1349         case COLUMN_OFF:
1350             edit->column_highlight = 0;
1351             break;
1352         }
1353         if (ac >= 256 && ac < 512)
1354             edit_insert_ahead (edit, ac - 256);
1355         if (ac >= 0 && ac < 256)
1356             edit_insert (edit, ac);
1357
1358         if (ac >= MARK_1 - 2 && ac < MARK_2 - 2)
1359         {
1360             edit->mark1 = ac - MARK_1;
1361             edit->column1 =
1362                 (long) edit_move_forward3 (edit, edit_bol (edit, edit->mark1), 0, edit->mark1);
1363         }
1364         else if (ac >= MARK_2 - 2 && ac < KEY_PRESS)
1365         {
1366             edit->mark2 = ac - MARK_2;
1367             edit->column2 =
1368                 (long) edit_move_forward3 (edit, edit_bol (edit, edit->mark2), 0, edit->mark2);
1369         }
1370         /* more than one pop usually means something big */
1371         if (count++)
1372             edit->force |= REDRAW_PAGE;
1373     }
1374
1375     if (edit->start_display > ac - KEY_PRESS)
1376     {
1377         edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
1378         edit->force |= REDRAW_PAGE;
1379     }
1380     else if (edit->start_display < ac - KEY_PRESS)
1381     {
1382         edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
1383         edit->force |= REDRAW_PAGE;
1384     }
1385     edit->start_display = ac - KEY_PRESS;       /* see push and pop above */
1386     edit_update_curs_row (edit);
1387
1388   done_redo:
1389     ;
1390 }
1391
1392 /* --------------------------------------------------------------------------------------------- */
1393
1394 static void
1395 edit_group_undo (WEdit * edit)
1396 {
1397     long ac = KEY_PRESS;
1398     long cur_ac = KEY_PRESS;
1399     while (ac != STACK_BOTTOM && ac == cur_ac)
1400     {
1401         cur_ac = get_prev_undo_action (edit);
1402         edit_do_undo (edit);
1403         ac = get_prev_undo_action (edit);
1404         /* exit from cycle if option_group_undo is not set,
1405          * and make single UNDO operation
1406          */
1407         if (!option_group_undo)
1408             ac = STACK_BOTTOM;
1409     }
1410 }
1411
1412 /* --------------------------------------------------------------------------------------------- */
1413
1414 static void
1415 edit_delete_to_line_end (WEdit * edit)
1416 {
1417     while (edit_get_byte (edit, edit->curs1) != '\n' && edit->curs2 != 0)
1418         edit_delete (edit, TRUE);
1419 }
1420
1421 /* --------------------------------------------------------------------------------------------- */
1422
1423 static void
1424 edit_delete_to_line_begin (WEdit * edit)
1425 {
1426     while (edit_get_byte (edit, edit->curs1 - 1) != '\n' && edit->curs1 != 0)
1427         edit_backspace (edit, TRUE);
1428 }
1429
1430 /* --------------------------------------------------------------------------------------------- */
1431
1432 static gboolean
1433 is_aligned_on_a_tab (WEdit * edit)
1434 {
1435     long curs_col;
1436
1437     edit_update_curs_col (edit);
1438     curs_col = edit->curs_col % (TAB_SIZE * space_width);
1439     return (curs_col == 0 || curs_col == (HALF_TAB_SIZE * space_width));
1440 }
1441
1442 /* --------------------------------------------------------------------------------------------- */
1443
1444 static gboolean
1445 right_of_four_spaces (WEdit * edit)
1446 {
1447     int i, ch = 0;
1448
1449     for (i = 1; i <= HALF_TAB_SIZE; i++)
1450         ch |= edit_get_byte (edit, edit->curs1 - i);
1451
1452     return (ch == ' ' && is_aligned_on_a_tab (edit));
1453 }
1454
1455 /* --------------------------------------------------------------------------------------------- */
1456
1457 static gboolean
1458 left_of_four_spaces (WEdit * edit)
1459 {
1460     int i, ch = 0;
1461
1462     for (i = 0; i < HALF_TAB_SIZE; i++)
1463         ch |= edit_get_byte (edit, edit->curs1 + i);
1464
1465     return (ch == ' ' && is_aligned_on_a_tab (edit));
1466 }
1467
1468 /* --------------------------------------------------------------------------------------------- */
1469
1470 static void
1471 edit_auto_indent (WEdit * edit)
1472 {
1473     off_t p;
1474     char c;
1475
1476     p = edit->curs1;
1477     /* use the previous line as a template */
1478     p = edit_move_backward (edit, p, 1);
1479     /* copy the leading whitespace of the line */
1480     while (TRUE)
1481     {                           /* no range check - the line _is_ \n-terminated */
1482         c = edit_get_byte (edit, p++);
1483         if (c != ' ' && c != '\t')
1484             break;
1485         edit_insert (edit, c);
1486     }
1487 }
1488
1489 /* --------------------------------------------------------------------------------------------- */
1490
1491 static inline void
1492 edit_double_newline (WEdit * edit)
1493 {
1494     edit_insert (edit, '\n');
1495     if (edit_get_byte (edit, edit->curs1) == '\n' || edit_get_byte (edit, edit->curs1 - 2) == '\n')
1496         return;
1497     edit->force |= REDRAW_PAGE;
1498     edit_insert (edit, '\n');
1499 }
1500
1501 /* --------------------------------------------------------------------------------------------- */
1502
1503 static void
1504 insert_spaces_tab (WEdit * edit, gboolean half)
1505 {
1506     long i;
1507
1508     edit_update_curs_col (edit);
1509     i = option_tab_spacing * space_width;
1510     if (half)
1511         i /= 2;
1512     if (i != 0)
1513     {
1514         i = ((edit->curs_col / i) + 1) * i - edit->curs_col;
1515         while (i > 0)
1516         {
1517             edit_insert (edit, ' ');
1518             i -= space_width;
1519         }
1520     }
1521 }
1522
1523 /* --------------------------------------------------------------------------------------------- */
1524
1525 static inline void
1526 edit_tab_cmd (WEdit * edit)
1527 {
1528     if (option_fake_half_tabs && is_in_indent (edit))
1529     {
1530         /* insert a half tab (usually four spaces) unless there is a
1531            half tab already behind, then delete it and insert a
1532            full tab. */
1533         if (option_fill_tabs_with_spaces || !right_of_four_spaces (edit))
1534             insert_spaces_tab (edit, TRUE);
1535         else
1536         {
1537             int i;
1538
1539             for (i = 1; i <= HALF_TAB_SIZE; i++)
1540                 edit_backspace (edit, TRUE);
1541             edit_insert (edit, '\t');
1542         }
1543     }
1544     else if (option_fill_tabs_with_spaces)
1545         insert_spaces_tab (edit, FALSE);
1546     else
1547         edit_insert (edit, '\t');
1548 }
1549
1550 /* --------------------------------------------------------------------------------------------- */
1551
1552 static void
1553 check_and_wrap_line (WEdit * edit)
1554 {
1555     off_t curs;
1556     int c;
1557
1558     if (!option_typewriter_wrap)
1559         return;
1560     edit_update_curs_col (edit);
1561     if (edit->curs_col < option_word_wrap_line_length)
1562         return;
1563     curs = edit->curs1;
1564     while (TRUE)
1565     {
1566         curs--;
1567         c = edit_get_byte (edit, curs);
1568         if (c == '\n' || curs <= 0)
1569         {
1570             edit_insert (edit, '\n');
1571             return;
1572         }
1573         if (c == ' ' || c == '\t')
1574         {
1575             off_t current = edit->curs1;
1576             edit_cursor_move (edit, curs - edit->curs1 + 1);
1577             edit_insert (edit, '\n');
1578             edit_cursor_move (edit, current - edit->curs1 + 1);
1579             return;
1580         }
1581     }
1582 }
1583
1584 /* --------------------------------------------------------------------------------------------- */
1585 /** this find the matching bracket in either direction, and sets edit->bracket
1586  *
1587  * @param edit editor object
1588  * @param in_screen seach only on the current screen
1589  * @param furthest_bracket_search count of the bytes for search
1590  *
1591  * @return position of the found bracket (-1 if no match)
1592  */
1593
1594 static off_t
1595 edit_get_bracket (WEdit * edit, gboolean in_screen, unsigned long furthest_bracket_search)
1596 {
1597     const char *const b = "{}{[][()(", *p;
1598     int i = 1, a, inc = -1, c, d, n = 0;
1599     unsigned long j = 0;
1600     off_t q;
1601     edit_update_curs_row (edit);
1602     c = edit_get_byte (edit, edit->curs1);
1603     p = strchr (b, c);
1604     /* no limit */
1605     if (!furthest_bracket_search)
1606         furthest_bracket_search--;
1607     /* not on a bracket at all */
1608     if (p == NULL)
1609         return -1;
1610     /* the matching bracket */
1611     d = p[1];
1612     /* going left or right? */
1613     if (strchr ("{[(", c))
1614         inc = 1;
1615     for (q = edit->curs1 + inc;; q += inc)
1616     {
1617         /* out of buffer? */
1618         if (q >= edit->last_byte || q < 0)
1619             break;
1620         a = edit_get_byte (edit, q);
1621         /* don't want to eat CPU */
1622         if (j++ > furthest_bracket_search)
1623             break;
1624         /* out of screen? */
1625         if (in_screen)
1626         {
1627             if (q < edit->start_display)
1628                 break;
1629             /* count lines if searching downward */
1630             if (inc > 0 && a == '\n')
1631                 if (n++ >= WIDGET (edit)->lines - edit->curs_row)       /* out of screen */
1632                     break;
1633         }
1634         /* count bracket depth */
1635         i += (a == c) - (a == d);
1636         /* return if bracket depth is zero */
1637         if (i == 0)
1638             return q;
1639     }
1640     /* no match */
1641     return -1;
1642 }
1643
1644 /* --------------------------------------------------------------------------------------------- */
1645
1646 static inline void
1647 edit_goto_matching_bracket (WEdit * edit)
1648 {
1649     off_t q;
1650
1651     q = edit_get_bracket (edit, 0, 0);
1652     if (q >= 0)
1653     {
1654         edit->bracket = edit->curs1;
1655         edit->force |= REDRAW_PAGE;
1656         edit_cursor_move (edit, q - edit->curs1);
1657     }
1658 }
1659
1660 /* --------------------------------------------------------------------------------------------- */
1661
1662 static void
1663 edit_move_block_to_right (WEdit * edit)
1664 {
1665     off_t start_mark, end_mark;
1666     long cur_bol, start_bol;
1667
1668     if (eval_marks (edit, &start_mark, &end_mark))
1669         return;
1670
1671     start_bol = edit_bol (edit, start_mark);
1672     cur_bol = edit_bol (edit, end_mark - 1);
1673
1674     do
1675     {
1676         edit_cursor_move (edit, cur_bol - edit->curs1);
1677         if (!edit_line_is_blank (edit, edit->curs_line))
1678         {
1679             if (option_fill_tabs_with_spaces)
1680                 insert_spaces_tab (edit, option_fake_half_tabs);
1681             else
1682                 edit_insert (edit, '\t');
1683             edit_cursor_move (edit, edit_bol (edit, cur_bol) - edit->curs1);
1684         }
1685
1686         if (cur_bol == 0)
1687             break;
1688
1689         cur_bol = edit_bol (edit, cur_bol - 1);
1690     }
1691     while (cur_bol >= start_bol);
1692
1693     edit->force |= REDRAW_PAGE;
1694 }
1695
1696 /* --------------------------------------------------------------------------------------------- */
1697
1698 static void
1699 edit_move_block_to_left (WEdit * edit)
1700 {
1701     off_t start_mark, end_mark;
1702     off_t cur_bol, start_bol;
1703     int i;
1704
1705     if (eval_marks (edit, &start_mark, &end_mark))
1706         return;
1707
1708     start_bol = edit_bol (edit, start_mark);
1709     cur_bol = edit_bol (edit, end_mark - 1);
1710
1711     do
1712     {
1713         int del_tab_width;
1714         int next_char;
1715
1716         edit_cursor_move (edit, cur_bol - edit->curs1);
1717
1718         if (option_fake_half_tabs)
1719             del_tab_width = HALF_TAB_SIZE;
1720         else
1721             del_tab_width = option_tab_spacing;
1722
1723         next_char = edit_get_byte (edit, edit->curs1);
1724         if (next_char == '\t')
1725             edit_delete (edit, TRUE);
1726         else if (next_char == ' ')
1727             for (i = 1; i <= del_tab_width; i++)
1728             {
1729                 if (next_char == ' ')
1730                     edit_delete (edit, TRUE);
1731                 next_char = edit_get_byte (edit, edit->curs1);
1732             }
1733
1734         if (cur_bol == 0)
1735             break;
1736
1737         cur_bol = edit_bol (edit, cur_bol - 1);
1738     }
1739     while (cur_bol >= start_bol);
1740
1741     edit->force |= REDRAW_PAGE;
1742 }
1743
1744 /* --------------------------------------------------------------------------------------------- */
1745 /**
1746  * prints at the cursor
1747  * @return number of chars printed
1748  */
1749
1750 static size_t
1751 edit_print_string (WEdit * e, const char *s)
1752 {
1753     size_t i = 0;
1754
1755     while (s[i] != '\0')
1756         edit_execute_cmd (e, CK_InsertChar, (unsigned char) s[i++]);
1757     e->force |= REDRAW_COMPLETELY;
1758     edit_update_screen (e);
1759     return i;
1760 }
1761
1762 /* --------------------------------------------------------------------------------------------- */
1763 /*** public functions ****************************************************************************/
1764 /* --------------------------------------------------------------------------------------------- */
1765
1766 /** User edit menu, like user menu (F2) but only in editor. */
1767
1768 void
1769 user_menu (WEdit * edit, const char *menu_file, int selected_entry)
1770 {
1771     char *block_file;
1772     int nomark;
1773     off_t curs;
1774     off_t start_mark, end_mark;
1775     struct stat status;
1776     vfs_path_t *block_file_vpath;
1777
1778     block_file = mc_config_get_full_path (EDIT_BLOCK_FILE);
1779     block_file_vpath = vfs_path_from_str (block_file);
1780     curs = edit->curs1;
1781     nomark = eval_marks (edit, &start_mark, &end_mark);
1782     if (nomark == 0)
1783         edit_save_block (edit, block_file, start_mark, end_mark);
1784
1785     /* run shell scripts from menu */
1786     if (user_menu_cmd (edit, menu_file, selected_entry)
1787         && (mc_stat (block_file_vpath, &status) == 0) && (status.st_size != 0))
1788     {
1789         int rc = 0;
1790         FILE *fd;
1791
1792         /* i.e. we have marked block */
1793         if (nomark == 0)
1794             rc = edit_block_delete_cmd (edit);
1795
1796         if (rc == 0)
1797         {
1798             off_t ins_len;
1799
1800             ins_len = edit_insert_file (edit, block_file_vpath);
1801             if (nomark == 0 && ins_len > 0)
1802                 edit_set_markers (edit, start_mark, start_mark + ins_len, 0, 0);
1803         }
1804         /* truncate block file */
1805         fd = fopen (block_file, "w");
1806         if (fd != NULL)
1807             fclose (fd);
1808     }
1809     g_free (block_file);
1810     vfs_path_free (block_file_vpath);
1811
1812     edit_cursor_move (edit, curs - edit->curs1);
1813     edit->force |= REDRAW_PAGE;
1814     send_message (edit, NULL, MSG_DRAW, 0, NULL);
1815 }
1816
1817 /* --------------------------------------------------------------------------------------------- */
1818
1819 int
1820 edit_get_byte (const WEdit * edit, off_t byte_index)
1821 {
1822     off_t p;
1823
1824     if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
1825         return '\n';
1826
1827     if (byte_index >= edit->curs1)
1828     {
1829         p = edit->curs1 + edit->curs2 - byte_index - 1;
1830         return edit->buffers2[p >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1];
1831     }
1832
1833     return edit->buffers1[byte_index >> S_EDIT_BUF_SIZE][byte_index & M_EDIT_BUF_SIZE];
1834 }
1835
1836 /* --------------------------------------------------------------------------------------------- */
1837
1838 #ifdef HAVE_CHARSET
1839 int
1840 edit_get_utf (const WEdit * edit, off_t byte_index, int *char_width)
1841 {
1842     gchar *str = NULL;
1843     int res = -1;
1844     gunichar ch;
1845     gchar *next_ch = NULL;
1846     int width = 0;
1847     gchar utf8_buf[UTF8_CHAR_LEN + 1];
1848
1849     if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
1850     {
1851         *char_width = 0;
1852         return '\n';
1853     }
1854
1855     str = edit_get_byte_ptr (edit, byte_index);
1856
1857     if (str == NULL)
1858     {
1859         *char_width = 0;
1860         return 0;
1861     }
1862
1863     res = g_utf8_get_char_validated (str, -1);
1864
1865     if (res < 0)
1866     {
1867         /* Retry with explicit bytes to make sure it's not a buffer boundary */
1868         int i;
1869         for (i = 0; i < UTF8_CHAR_LEN; i++)
1870             utf8_buf[i] = edit_get_byte (edit, byte_index + i);
1871         utf8_buf[UTF8_CHAR_LEN] = '\0';
1872         str = utf8_buf;
1873         res = g_utf8_get_char_validated (str, -1);
1874     }
1875
1876     if (res < 0)
1877     {
1878         ch = *str;
1879         width = 0;
1880     }
1881     else
1882     {
1883         ch = res;
1884         /* Calculate UTF-8 char width */
1885         next_ch = g_utf8_next_char (str);
1886         if (next_ch)
1887         {
1888             width = next_ch - str;
1889         }
1890         else
1891         {
1892             ch = 0;
1893             width = 0;
1894         }
1895     }
1896     *char_width = width;
1897     return ch;
1898 }
1899 #endif
1900
1901 /* --------------------------------------------------------------------------------------------- */
1902
1903 char *
1904 edit_get_write_filter (const vfs_path_t * write_name_vpath, const vfs_path_t * filename_vpath)
1905 {
1906     int i;
1907     char *p, *writename;
1908     const vfs_path_element_t *path_element;
1909
1910     i = edit_find_filter (filename_vpath);
1911     if (i < 0)
1912         return NULL;
1913
1914     path_element = vfs_path_get_by_index (write_name_vpath, -1);
1915     writename = name_quote (path_element->path, 0);
1916     p = g_strdup_printf (all_filters[i].write, writename);
1917     g_free (writename);
1918     return p;
1919 }
1920
1921 /* --------------------------------------------------------------------------------------------- */
1922 /**
1923  * @param edit   editor object
1924  * @param f      value of stream file
1925  * @return       the length of the file
1926  */
1927
1928 off_t
1929 edit_write_stream (WEdit * edit, FILE * f)
1930 {
1931     long i;
1932
1933     if (edit->lb == LB_ASIS)
1934     {
1935         for (i = 0; i < edit->last_byte; i++)
1936             if (fputc (edit_get_byte (edit, i), f) < 0)
1937                 break;
1938         return i;
1939     }
1940
1941     /* change line breaks */
1942     for (i = 0; i < edit->last_byte; i++)
1943     {
1944         unsigned char c = edit_get_byte (edit, i);
1945
1946         if (!(c == '\n' || c == '\r'))
1947         {
1948             /* not line break */
1949             if (fputc (c, f) < 0)
1950                 return i;
1951         }
1952         else
1953         {                       /* (c == '\n' || c == '\r') */
1954             unsigned char c1 = edit_get_byte (edit, i + 1);     /* next char */
1955
1956             switch (edit->lb)
1957             {
1958             case LB_UNIX:      /* replace "\r\n" or '\r' to '\n' */
1959                 /* put one line break unconditionally */
1960                 if (fputc ('\n', f) < 0)
1961                     return i;
1962
1963                 i++;            /* 2 chars are processed */
1964
1965                 if (c == '\r' && c1 == '\n')
1966                     /* Windows line break; go to the next char */
1967                     break;
1968
1969                 if (c == '\r' && c1 == '\r')
1970                 {
1971                     /* two Macintosh line breaks; put second line break */
1972                     if (fputc ('\n', f) < 0)
1973                         return i;
1974                     break;
1975                 }
1976
1977                 if (fputc (c1, f) < 0)
1978                     return i;
1979                 break;
1980
1981             case LB_WIN:       /* replace '\n' or '\r' to "\r\n" */
1982                 /* put one line break unconditionally */
1983                 if (fputc ('\r', f) < 0 || fputc ('\n', f) < 0)
1984                     return i;
1985
1986                 if (c == '\r' && c1 == '\n')
1987                     /* Windows line break; go to the next char */
1988                     i++;
1989                 break;
1990
1991             case LB_MAC:       /* replace "\r\n" or '\n' to '\r' */
1992                 /* put one line break unconditionally */
1993                 if (fputc ('\r', f) < 0)
1994                     return i;
1995
1996                 i++;            /* 2 chars are processed */
1997
1998                 if (c == '\r' && c1 == '\n')
1999                     /* Windows line break; go to the next char */
2000                     break;
2001
2002                 if (c == '\n' && c1 == '\n')
2003                 {
2004                     /* two Windows line breaks; put second line break */
2005                     if (fputc ('\r', f) < 0)
2006                         return i;
2007                     break;
2008                 }
2009
2010                 if (fputc (c1, f) < 0)
2011                     return i;
2012                 break;
2013             case LB_ASIS:      /* default without changes */
2014                 break;
2015             }
2016         }
2017     }
2018
2019     return edit->last_byte;
2020 }
2021
2022 /* --------------------------------------------------------------------------------------------- */
2023
2024 gboolean
2025 is_break_char (char c)
2026 {
2027     return (isspace (c) || strchr ("{}[]()<>=|/\\!?~-+`'\",.;:#$%^&*", c));
2028 }
2029
2030 /* --------------------------------------------------------------------------------------------- */
2031
2032 char *
2033 edit_get_word_from_pos (const WEdit * edit, off_t start_pos, off_t * start, gsize * len,
2034                         gsize * cut)
2035 {
2036     off_t word_start;
2037     long cut_len = 0;
2038     GString *match_expr;
2039     int c1, c2;
2040
2041     for (word_start = start_pos; word_start != 0; word_start--, cut_len++)
2042     {
2043         c1 = edit_get_byte (edit, word_start);
2044         c2 = edit_get_byte (edit, word_start - 1);
2045
2046         if (is_break_char (c1) != is_break_char (c2) || c1 == '\n' || c2 == '\n')
2047             break;
2048     }
2049
2050     match_expr = g_string_sized_new (16);
2051
2052     do
2053     {
2054         c1 = edit_get_byte (edit, word_start + match_expr->len);
2055         c2 = edit_get_byte (edit, word_start + match_expr->len + 1);
2056         g_string_append_c (match_expr, c1);
2057     }
2058     while (!(is_break_char (c1) != is_break_char (c2) || c1 == '\n' || c2 == '\n'));
2059
2060     *len = match_expr->len;
2061     *start = word_start;
2062     *cut = cut_len;
2063
2064     return g_string_free (match_expr, FALSE);
2065 }
2066
2067 /* --------------------------------------------------------------------------------------------- */
2068 /** inserts a file at the cursor, returns count of inserted bytes on success */
2069
2070 long
2071 edit_insert_file (WEdit * edit, const vfs_path_t * filename_vpath)
2072 {
2073     char *p;
2074     off_t current;
2075     off_t ins_len = 0;
2076
2077     p = edit_get_filter (filename_vpath);
2078     current = edit->curs1;
2079
2080     if (p != NULL)
2081     {
2082         FILE *f;
2083
2084         f = (FILE *) popen (p, "r");
2085         if (f != NULL)
2086         {
2087             edit_insert_stream (edit, f);
2088
2089             /* Place cursor at the end of text selection */
2090             if (!option_cursor_after_inserted_block)
2091             {
2092                 ins_len = edit->curs1 - current;
2093                 edit_cursor_move (edit, -ins_len);
2094             }
2095             if (pclose (f) > 0)
2096             {
2097                 char *errmsg;
2098
2099                 errmsg = g_strdup_printf (_("Error reading from pipe: %s"), p);
2100                 edit_error_dialog (_("Error"), errmsg);
2101                 g_free (errmsg);
2102                 ins_len = -1;
2103             }
2104         }
2105         else
2106         {
2107             char *errmsg;
2108
2109             errmsg = g_strdup_printf (_("Cannot open pipe for reading: %s"), p);
2110             edit_error_dialog (_("Error"), errmsg);
2111             g_free (errmsg);
2112             ins_len = -1;
2113         }
2114         g_free (p);
2115     }
2116     else
2117     {
2118         int file;
2119         off_t blocklen;
2120         int vertical_insertion = 0;
2121         char *buf;
2122
2123         file = mc_open (filename_vpath, O_RDONLY | O_BINARY);
2124         if (file == -1)
2125             return -1;
2126
2127         buf = g_malloc0 (TEMP_BUF_LEN);
2128         blocklen = mc_read (file, buf, sizeof (VERTICAL_MAGIC));
2129         if (blocklen > 0)
2130         {
2131             /* if contain signature VERTICAL_MAGIC then it vertical block */
2132             if (memcmp (buf, VERTICAL_MAGIC, sizeof (VERTICAL_MAGIC)) == 0)
2133                 vertical_insertion = 1;
2134             else
2135                 mc_lseek (file, 0, SEEK_SET);
2136         }
2137
2138         if (vertical_insertion)
2139         {
2140             off_t mark1, mark2;
2141             long c1, c2;
2142
2143             blocklen = edit_insert_column_of_text_from_file (edit, file, &mark1, &mark2, &c1, &c2);
2144             edit_set_markers (edit, edit->curs1, mark2, c1, c2);
2145
2146             /* highlight inserted text then not persistent blocks */
2147             if (!option_persistent_selections && edit->modified)
2148             {
2149                 if (!edit->column_highlight)
2150                     edit_push_undo_action (edit, COLUMN_OFF);
2151                 edit->column_highlight = 1;
2152             }
2153         }
2154         else
2155         {
2156             off_t i;
2157
2158             while ((blocklen = mc_read (file, (char *) buf, TEMP_BUF_LEN)) > 0)
2159             {
2160                 for (i = 0; i < blocklen; i++)
2161                     edit_insert (edit, buf[i]);
2162             }
2163             /* highlight inserted text then not persistent blocks */
2164             if (!option_persistent_selections && edit->modified)
2165             {
2166                 edit_set_markers (edit, edit->curs1, current, 0, 0);
2167                 if (edit->column_highlight)
2168                     edit_push_undo_action (edit, COLUMN_ON);
2169                 edit->column_highlight = 0;
2170             }
2171
2172             /* Place cursor at the end of text selection */
2173             if (!option_cursor_after_inserted_block)
2174             {
2175                 ins_len = edit->curs1 - current;
2176                 edit_cursor_move (edit, -ins_len);
2177             }
2178         }
2179
2180         edit->force |= REDRAW_PAGE;
2181         g_free (buf);
2182         mc_close (file);
2183         if (blocklen != 0)
2184             ins_len = 0;
2185     }
2186
2187     return ins_len;
2188 }
2189
2190 /* --------------------------------------------------------------------------------------------- */
2191 /**
2192  * Fill in the edit structure.  Return NULL on failure.  Pass edit as
2193  * NULL to allocate a new structure.
2194  *
2195  * If line is 0, try to restore saved position.  Otherwise put the
2196  * cursor on that line and show it in the middle of the screen.
2197  */
2198
2199 WEdit *
2200 edit_init (WEdit * edit, int y, int x, int lines, int cols, const vfs_path_t * filename_vpath,
2201            long line)
2202 {
2203     gboolean to_free = FALSE;
2204
2205     option_auto_syntax = 1;     /* Resetting to auto on every invokation */
2206     option_line_state_width = option_line_state ? LINE_STATE_WIDTH : 0;
2207
2208     if (edit != NULL)
2209     {
2210         /* save some widget parameters */
2211         gboolean fullscreen = edit->fullscreen;
2212         int y_prev = edit->y_prev;
2213         int x_prev = edit->x_prev;
2214         int lines_prev = edit->lines_prev;
2215         int cols_prev = edit->cols_prev;
2216
2217         edit_purge_widget (edit);
2218
2219         /* restore saved parameters */
2220         edit->fullscreen = fullscreen;
2221         edit->y_prev = y_prev;
2222         edit->x_prev = x_prev;
2223         edit->lines_prev = lines_prev;
2224         edit->cols_prev = cols_prev;
2225     }
2226     else
2227     {
2228 #ifdef ENABLE_NLS
2229         /*
2230          * Expand option_whole_chars_search by national letters using
2231          * current locale
2232          */
2233
2234         static char option_whole_chars_search_buf[256];
2235
2236         if (option_whole_chars_search_buf != option_whole_chars_search)
2237         {
2238             size_t i;
2239             size_t len = str_term_width1 (option_whole_chars_search);
2240
2241             strcpy (option_whole_chars_search_buf, option_whole_chars_search);
2242
2243             for (i = 1; i <= sizeof (option_whole_chars_search_buf); i++)
2244             {
2245                 if (g_ascii_islower ((gchar) i) && !strchr (option_whole_chars_search, i))
2246                 {
2247                     option_whole_chars_search_buf[len++] = i;
2248                 }
2249             }
2250
2251             option_whole_chars_search_buf[len] = 0;
2252             option_whole_chars_search = option_whole_chars_search_buf;
2253         }
2254 #endif /* ENABLE_NLS */
2255         edit = g_malloc0 (sizeof (WEdit));
2256         to_free = TRUE;
2257
2258         init_widget (WIDGET (edit), y, x, lines, cols, NULL, NULL);
2259         edit->fullscreen = TRUE;
2260         edit_save_size (edit);
2261     }
2262
2263     edit->drag_state = MCEDIT_DRAG_NORMAL;
2264
2265     edit->stat1.st_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
2266     edit->stat1.st_uid = getuid ();
2267     edit->stat1.st_gid = getgid ();
2268     edit->stat1.st_mtime = 0;
2269
2270     edit->over_col = 0;
2271     edit->bracket = -1;
2272     edit->force |= REDRAW_PAGE;
2273
2274     /* set file name before load file */
2275     edit_set_filename (edit, filename_vpath);
2276
2277     edit->undo_stack_size = START_STACK_SIZE;
2278     edit->undo_stack_size_mask = START_STACK_SIZE - 1;
2279     edit->undo_stack = g_malloc0 ((edit->undo_stack_size + 10) * sizeof (long));
2280
2281     edit->redo_stack_size = START_STACK_SIZE;
2282     edit->redo_stack_size_mask = START_STACK_SIZE - 1;
2283     edit->redo_stack = g_malloc0 ((edit->redo_stack_size + 10) * sizeof (long));
2284
2285 #ifdef HAVE_CHARSET
2286     edit->utf8 = FALSE;
2287     edit->converter = str_cnv_from_term;
2288     edit_set_codeset (edit);
2289 #endif
2290
2291     if (!edit_load_file (edit))
2292     {
2293         /* edit_load_file already gives an error message */
2294         if (to_free)
2295             g_free (edit);
2296         return NULL;
2297     }
2298
2299     edit->loading_done = 1;
2300     edit->modified = 0;
2301     edit->locked = 0;
2302     edit_load_syntax (edit, NULL, NULL);
2303     edit_get_syntax_color (edit, -1);
2304
2305     /* load saved cursor position */
2306     if ((line == 0) && option_save_position)
2307         edit_load_position (edit);
2308     else
2309     {
2310         if (line <= 0)
2311             line = 1;
2312         edit_move_display (edit, line - 1);
2313         edit_move_to_line (edit, line - 1);
2314     }
2315
2316     edit_load_macro_cmd (edit);
2317
2318     return edit;
2319 }
2320
2321 /* --------------------------------------------------------------------------------------------- */
2322
2323 /** Clear the edit struct, freeing everything in it.  Return TRUE on success */
2324 gboolean
2325 edit_clean (WEdit * edit)
2326 {
2327     int j = 0;
2328
2329     if (edit == NULL)
2330         return FALSE;
2331
2332     /* a stale lock, remove it */
2333     if (edit->locked)
2334         edit->locked = unlock_file (edit->filename_vpath);
2335
2336     /* save cursor position */
2337     if (option_save_position)
2338         edit_save_position (edit);
2339     else if (edit->serialized_bookmarks != NULL)
2340         edit->serialized_bookmarks = (GArray *) g_array_free (edit->serialized_bookmarks, TRUE);
2341
2342     /* File specified on the mcedit command line and never saved */
2343     if (edit->delete_file)
2344         unlink (vfs_path_get_last_path_str (edit->filename_vpath));
2345
2346     edit_free_syntax_rules (edit);
2347     book_mark_flush (edit, -1);
2348     for (; j <= MAXBUFF; j++)
2349     {
2350         g_free (edit->buffers1[j]);
2351         g_free (edit->buffers2[j]);
2352     }
2353
2354     g_free (edit->undo_stack);
2355     g_free (edit->redo_stack);
2356     vfs_path_free (edit->filename_vpath);
2357     vfs_path_free (edit->dir_vpath);
2358     mc_search_free (edit->search);
2359     edit->search = NULL;
2360
2361 #ifdef HAVE_CHARSET
2362     if (edit->converter != str_cnv_from_term)
2363         str_close_conv (edit->converter);
2364 #endif
2365
2366     edit_purge_widget (edit);
2367
2368     return TRUE;
2369 }
2370
2371 /* --------------------------------------------------------------------------------------------- */
2372
2373 /**
2374  * Load a new file into the editor and set line.  If it fails, preserve the old file.
2375  * To do it, allocate a new widget, initialize it and, if the new file
2376  * was loaded, copy the data to the old widget.
2377  *
2378  * @return TRUE on success, FALSE on failure.
2379  */
2380 gboolean
2381 edit_reload_line (WEdit * edit, const vfs_path_t * filename_vpath, long line)
2382 {
2383     Widget *w = WIDGET (edit);
2384     WEdit *e;
2385
2386     e = g_malloc0 (sizeof (WEdit));
2387     *WIDGET (e) = *w;
2388     /* save some widget parameters */
2389     e->fullscreen = edit->fullscreen;
2390     e->y_prev = edit->y_prev;
2391     e->x_prev = edit->x_prev;
2392     e->lines_prev = edit->lines_prev;
2393     e->cols_prev = edit->cols_prev;
2394
2395     if (edit_init (e, w->y, w->x, w->lines, w->cols, filename_vpath, line) == NULL)
2396     {
2397         g_free (e);
2398         return FALSE;
2399     }
2400
2401     edit_clean (edit);
2402     memcpy (edit, e, sizeof (WEdit));
2403     g_free (e);
2404
2405     return TRUE;
2406 }
2407
2408 /* --------------------------------------------------------------------------------------------- */
2409
2410 #ifdef HAVE_CHARSET
2411 void
2412 edit_set_codeset (WEdit * edit)
2413 {
2414     const char *cp_id;
2415
2416     cp_id =
2417         get_codepage_id (mc_global.source_codepage >=
2418                          0 ? mc_global.source_codepage : mc_global.display_codepage);
2419
2420     if (cp_id != NULL)
2421     {
2422         GIConv conv;
2423         conv = str_crt_conv_from (cp_id);
2424         if (conv != INVALID_CONV)
2425         {
2426             if (edit->converter != str_cnv_from_term)
2427                 str_close_conv (edit->converter);
2428             edit->converter = conv;
2429         }
2430     }
2431
2432     if (cp_id != NULL)
2433         edit->utf8 = str_isutf8 (cp_id);
2434 }
2435 #endif
2436
2437
2438 /* --------------------------------------------------------------------------------------------- */
2439
2440 /**
2441  * Recording stack for undo:
2442  * The following is an implementation of a compressed stack. Identical
2443  * pushes are recorded by a negative prefix indicating the number of times the
2444  * same char was pushed. This saves space for repeated curs-left or curs-right
2445  * delete etc.
2446  *
2447  * eg:
2448  *
2449  * pushed:       stored:
2450  *
2451  * a
2452  * b             a
2453  * b            -3
2454  * b             b
2455  * c  -->       -4
2456  * c             c
2457  * c             d
2458  * c
2459  * d
2460  *
2461  * If the stack long int is 0-255 it represents a normal insert (from a backspace),
2462  * 256-512 is an insert ahead (from a delete), If it is betwen 600 and 700 it is one
2463  * of the cursor functions define'd in edit-impl.h. 1000 through 700'000'000 is to
2464  * set edit->mark1 position. 700'000'000 through 1400'000'000 is to set edit->mark2
2465  * position.
2466  *
2467  * The only way the cursor moves or the buffer is changed is through the routines:
2468  * insert, backspace, insert_ahead, delete, and cursor_move.
2469  * These record the reverse undo movements onto the stack each time they are
2470  * called.
2471  *
2472  * Each key press results in a set of actions (insert; delete ...). So each time
2473  * a key is pressed the current position of start_display is pushed as
2474  * KEY_PRESS + start_display. Then for undoing, we pop until we get to a number
2475  * over KEY_PRESS. We then assign this number less KEY_PRESS to start_display. So undo
2476  * tracks scrolling and key actions exactly. (KEY_PRESS is about (2^31) * (2/3) = 1400'000'000)
2477  *
2478  *
2479  *
2480  * @param edit editor object
2481  * @param c code of the action
2482  */
2483
2484 void
2485 edit_push_undo_action (WEdit * edit, long c)
2486 {
2487     unsigned long sp = edit->undo_stack_pointer;
2488     unsigned long spm1;
2489     long *t;
2490
2491     /* first enlarge the stack if necessary */
2492     if (sp > edit->undo_stack_size - 10)
2493     {                           /* say */
2494         if (option_max_undo < 256)
2495             option_max_undo = 256;
2496         if (edit->undo_stack_size < (unsigned long) option_max_undo)
2497         {
2498             t = g_realloc (edit->undo_stack, (edit->undo_stack_size * 2 + 10) * sizeof (long));
2499             if (t)
2500             {
2501                 edit->undo_stack = t;
2502                 edit->undo_stack_size <<= 1;
2503                 edit->undo_stack_size_mask = edit->undo_stack_size - 1;
2504             }
2505         }
2506     }
2507     spm1 = (edit->undo_stack_pointer - 1) & edit->undo_stack_size_mask;
2508     if (edit->undo_stack_disable)
2509     {
2510         edit_push_redo_action (edit, KEY_PRESS);
2511         edit_push_redo_action (edit, c);
2512         return;
2513     }
2514
2515     if (edit->redo_stack_reset)
2516         edit->redo_stack_bottom = edit->redo_stack_pointer = 0;
2517
2518     if (edit->undo_stack_bottom != sp
2519         && spm1 != edit->undo_stack_bottom
2520         && ((sp - 2) & edit->undo_stack_size_mask) != edit->undo_stack_bottom)
2521     {
2522         int d;
2523         if (edit->undo_stack[spm1] < 0)
2524         {
2525             d = edit->undo_stack[(sp - 2) & edit->undo_stack_size_mask];
2526             if (d == c && edit->undo_stack[spm1] > -1000000000)
2527             {
2528                 if (c < KEY_PRESS)      /* --> no need to push multiple do-nothings */
2529                     edit->undo_stack[spm1]--;
2530                 return;
2531             }
2532         }
2533         else
2534         {
2535             d = edit->undo_stack[spm1];
2536             if (d == c)
2537             {
2538                 if (c >= KEY_PRESS)
2539                     return;     /* --> no need to push multiple do-nothings */
2540                 edit->undo_stack[sp] = -2;
2541                 goto check_bottom;
2542             }
2543         }
2544     }
2545     edit->undo_stack[sp] = c;
2546
2547   check_bottom:
2548     edit->undo_stack_pointer = (edit->undo_stack_pointer + 1) & edit->undo_stack_size_mask;
2549
2550     /* if the sp wraps round and catches the undo_stack_bottom then erase
2551      * the first set of actions on the stack to make space - by moving
2552      * undo_stack_bottom forward one "key press" */
2553     c = (edit->undo_stack_pointer + 2) & edit->undo_stack_size_mask;
2554     if ((unsigned long) c == edit->undo_stack_bottom ||
2555         (((unsigned long) c + 1) & edit->undo_stack_size_mask) == edit->undo_stack_bottom)
2556         do
2557         {
2558             edit->undo_stack_bottom = (edit->undo_stack_bottom + 1) & edit->undo_stack_size_mask;
2559         }
2560         while (edit->undo_stack[edit->undo_stack_bottom] < KEY_PRESS
2561                && edit->undo_stack_bottom != edit->undo_stack_pointer);
2562
2563     /*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: */
2564     if (edit->undo_stack_pointer != edit->undo_stack_bottom
2565         && edit->undo_stack[edit->undo_stack_bottom] < KEY_PRESS)
2566     {
2567         edit->undo_stack_bottom = edit->undo_stack_pointer = 0;
2568     }
2569 }
2570
2571 void
2572 edit_push_redo_action (WEdit * edit, long c)
2573 {
2574     unsigned long sp = edit->redo_stack_pointer;
2575     unsigned long spm1;
2576     long *t;
2577     /* first enlarge the stack if necessary */
2578     if (sp > edit->redo_stack_size - 10)
2579     {                           /* say */
2580         if (option_max_undo < 256)
2581             option_max_undo = 256;
2582         if (edit->redo_stack_size < (unsigned long) option_max_undo)
2583         {
2584             t = g_realloc (edit->redo_stack, (edit->redo_stack_size * 2 + 10) * sizeof (long));
2585             if (t)
2586             {
2587                 edit->redo_stack = t;
2588                 edit->redo_stack_size <<= 1;
2589                 edit->redo_stack_size_mask = edit->redo_stack_size - 1;
2590             }
2591         }
2592     }
2593     spm1 = (edit->redo_stack_pointer - 1) & edit->redo_stack_size_mask;
2594
2595     if (edit->redo_stack_bottom != sp
2596         && spm1 != edit->redo_stack_bottom
2597         && ((sp - 2) & edit->redo_stack_size_mask) != edit->redo_stack_bottom)
2598     {
2599         int d;
2600         if (edit->redo_stack[spm1] < 0)
2601         {
2602             d = edit->redo_stack[(sp - 2) & edit->redo_stack_size_mask];
2603             if (d == c && edit->redo_stack[spm1] > -1000000000)
2604             {
2605                 if (c < KEY_PRESS)      /* --> no need to push multiple do-nothings */
2606                     edit->redo_stack[spm1]--;
2607                 return;
2608             }
2609         }
2610         else
2611         {
2612             d = edit->redo_stack[spm1];
2613             if (d == c)
2614             {
2615                 if (c >= KEY_PRESS)
2616                     return;     /* --> no need to push multiple do-nothings */
2617                 edit->redo_stack[sp] = -2;
2618                 goto redo_check_bottom;
2619             }
2620         }
2621     }
2622     edit->redo_stack[sp] = c;
2623
2624   redo_check_bottom:
2625     edit->redo_stack_pointer = (edit->redo_stack_pointer + 1) & edit->redo_stack_size_mask;
2626
2627     /* if the sp wraps round and catches the redo_stack_bottom then erase
2628      * the first set of actions on the stack to make space - by moving
2629      * redo_stack_bottom forward one "key press" */
2630     c = (edit->redo_stack_pointer + 2) & edit->redo_stack_size_mask;
2631     if ((unsigned long) c == edit->redo_stack_bottom ||
2632         (((unsigned long) c + 1) & edit->redo_stack_size_mask) == edit->redo_stack_bottom)
2633         do
2634         {
2635             edit->redo_stack_bottom = (edit->redo_stack_bottom + 1) & edit->redo_stack_size_mask;
2636         }
2637         while (edit->redo_stack[edit->redo_stack_bottom] < KEY_PRESS
2638                && edit->redo_stack_bottom != edit->redo_stack_pointer);
2639
2640     /*
2641      * If a single key produced enough pushes to wrap all the way round then
2642      * we would notice that the [redo_stack_bottom] does not contain KEY_PRESS.
2643      * The stack is then initialised:
2644      */
2645
2646     if (edit->redo_stack_pointer != edit->redo_stack_bottom
2647         && edit->redo_stack[edit->redo_stack_bottom] < KEY_PRESS)
2648         edit->redo_stack_bottom = edit->redo_stack_pointer = 0;
2649 }
2650
2651 /* --------------------------------------------------------------------------------------------- */
2652 /**
2653    Basic low level single character buffer alterations and movements at the cursor.
2654    Returns char passed over, inserted or removed.
2655  */
2656
2657 void
2658 edit_insert (WEdit * edit, int c)
2659 {
2660     /* check if file has grown to large */
2661     if (edit->last_byte >= SIZE_LIMIT)
2662         return;
2663
2664     /* first we must update the position of the display window */
2665     if (edit->curs1 < edit->start_display)
2666     {
2667         edit->start_display++;
2668         if (c == '\n')
2669             edit->start_line++;
2670     }
2671
2672     /* Mark file as modified, unless the file hasn't been fully loaded */
2673     if (edit->loading_done)
2674         edit_modification (edit);
2675
2676     /* now we must update some info on the file and check if a redraw is required */
2677     if (c == '\n')
2678     {
2679         book_mark_inc (edit, edit->curs_line);
2680         edit->curs_line++;
2681         edit->total_lines++;
2682         edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
2683     }
2684
2685     /* save the reverse command onto the undo stack */
2686     /* ordinary char and not space */
2687     if (c > 32)
2688         edit_push_undo_action (edit, BACKSPACE);
2689     else
2690         edit_push_undo_action (edit, BACKSPACE_BR);
2691     /* update markers */
2692     edit->mark1 += (edit->mark1 > edit->curs1);
2693     edit->mark2 += (edit->mark2 > edit->curs1);
2694     edit->last_get_rule += (edit->last_get_rule > edit->curs1);
2695
2696     /* add a new buffer if we've reached the end of the last one */
2697     if (!(edit->curs1 & M_EDIT_BUF_SIZE))
2698         edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2699
2700     /* perform the insertion */
2701     edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE]
2702         = (unsigned char) c;
2703
2704     /* update file length */
2705     edit->last_byte++;
2706
2707     /* update cursor position */
2708     edit->curs1++;
2709 }
2710
2711 /* --------------------------------------------------------------------------------------------- */
2712 /** same as edit_insert and move left */
2713
2714 void
2715 edit_insert_ahead (WEdit * edit, int c)
2716 {
2717     if (edit->last_byte >= SIZE_LIMIT)
2718         return;
2719
2720     if (edit->curs1 < edit->start_display)
2721     {
2722         edit->start_display++;
2723         if (c == '\n')
2724             edit->start_line++;
2725     }
2726     edit_modification (edit);
2727     if (c == '\n')
2728     {
2729         book_mark_inc (edit, edit->curs_line);
2730         edit->total_lines++;
2731         edit->force |= REDRAW_AFTER_CURSOR;
2732     }
2733     /* ordinary char and not space */
2734     if (c > 32)
2735         edit_push_undo_action (edit, DELCHAR);
2736     else
2737         edit_push_undo_action (edit, DELCHAR_BR);
2738
2739     edit->mark1 += (edit->mark1 >= edit->curs1);
2740     edit->mark2 += (edit->mark2 >= edit->curs1);
2741     edit->last_get_rule += (edit->last_get_rule >= edit->curs1);
2742
2743     if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
2744         edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2745     edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]
2746         [EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
2747
2748     edit->last_byte++;
2749     edit->curs2++;
2750 }
2751
2752
2753 /* --------------------------------------------------------------------------------------------- */
2754
2755 int
2756 edit_delete (WEdit * edit, gboolean byte_delete)
2757 {
2758     int p = 0;
2759     int cw = 1;
2760     int i;
2761
2762     if (edit->curs2 == 0)
2763         return 0;
2764
2765 #ifdef HAVE_CHARSET
2766     /* if byte_delete == TRUE then delete only one byte not multibyte char */
2767     if (edit->utf8 && !byte_delete)
2768     {
2769         edit_get_utf (edit, edit->curs1, &cw);
2770         if (cw < 1)
2771             cw = 1;
2772     }
2773 #else
2774     (void) byte_delete;
2775 #endif
2776
2777     if (edit->mark2 != edit->mark1)
2778         edit_push_markers (edit);
2779
2780     for (i = 1; i <= cw; i++)
2781     {
2782         if (edit->mark1 > edit->curs1)
2783         {
2784             edit->mark1--;
2785             edit->end_mark_curs--;
2786         }
2787         if (edit->mark2 > edit->curs1)
2788             edit->mark2--;
2789         if (edit->last_get_rule > edit->curs1)
2790             edit->last_get_rule--;
2791
2792         p = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2793                                                                  ((edit->curs2 -
2794                                                                    1) & M_EDIT_BUF_SIZE) - 1];
2795
2796         if (!(edit->curs2 & M_EDIT_BUF_SIZE))
2797         {
2798             g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
2799             edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = NULL;
2800         }
2801         edit->last_byte--;
2802         edit->curs2--;
2803         edit_push_undo_action (edit, p + 256);
2804     }
2805
2806     edit_modification (edit);
2807     if (p == '\n')
2808     {
2809         book_mark_dec (edit, edit->curs_line);
2810         edit->total_lines--;
2811         edit->force |= REDRAW_AFTER_CURSOR;
2812     }
2813     if (edit->curs1 < edit->start_display)
2814     {
2815         edit->start_display--;
2816         if (p == '\n')
2817             edit->start_line--;
2818     }
2819
2820     return p;
2821 }
2822
2823 /* --------------------------------------------------------------------------------------------- */
2824
2825 int
2826 edit_backspace (WEdit * edit, gboolean byte_delete)
2827 {
2828     int p = 0;
2829     int cw = 1;
2830     int i;
2831
2832     if (edit->curs1 == 0)
2833         return 0;
2834
2835     if (edit->mark2 != edit->mark1)
2836         edit_push_markers (edit);
2837
2838 #ifdef HAVE_CHARSET
2839     if (edit->utf8 && !byte_delete)
2840     {
2841         edit_get_prev_utf (edit, edit->curs1, &cw);
2842         if (cw < 1)
2843             cw = 1;
2844     }
2845 #else
2846     (void) byte_delete;
2847 #endif
2848
2849     for (i = 1; i <= cw; i++)
2850     {
2851         if (edit->mark1 >= edit->curs1)
2852         {
2853             edit->mark1--;
2854             edit->end_mark_curs--;
2855         }
2856         if (edit->mark2 >= edit->curs1)
2857             edit->mark2--;
2858         if (edit->last_get_rule >= edit->curs1)
2859             edit->last_get_rule--;
2860
2861         p = *(edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE] +
2862               ((edit->curs1 - 1) & M_EDIT_BUF_SIZE));
2863         if (((edit->curs1 - 1) & M_EDIT_BUF_SIZE) == 0)
2864         {
2865             g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
2866             edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
2867         }
2868         edit->last_byte--;
2869         edit->curs1--;
2870         edit_push_undo_action (edit, p);
2871     }
2872     edit_modification (edit);
2873     if (p == '\n')
2874     {
2875         book_mark_dec (edit, edit->curs_line);
2876         edit->curs_line--;
2877         edit->total_lines--;
2878         edit->force |= REDRAW_AFTER_CURSOR;
2879     }
2880
2881     if (edit->curs1 < edit->start_display)
2882     {
2883         edit->start_display--;
2884         if (p == '\n')
2885             edit->start_line--;
2886     }
2887
2888     return p;
2889 }
2890
2891 /* --------------------------------------------------------------------------------------------- */
2892 /** moves the cursor right or left: increment positive or negative respectively */
2893
2894 void
2895 edit_cursor_move (WEdit * edit, off_t increment)
2896 {
2897     /* this is the same as a combination of two of the above routines, with only one push onto the undo stack */
2898     int c;
2899
2900     if (increment < 0)
2901     {
2902         for (; increment < 0; increment++)
2903         {
2904             if (edit->curs1 == 0)
2905                 return;
2906
2907             edit_push_undo_action (edit, CURS_RIGHT);
2908
2909             c = edit_get_byte (edit, edit->curs1 - 1);
2910             if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
2911                 edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2912             edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2913                                                            (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
2914             edit->curs2++;
2915             c = edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE][(edit->curs1 -
2916                                                                       1) & M_EDIT_BUF_SIZE];
2917             if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE))
2918             {
2919                 g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
2920                 edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
2921             }
2922             edit->curs1--;
2923             if (c == '\n')
2924             {
2925                 edit->curs_line--;
2926                 edit->force |= REDRAW_LINE_BELOW;
2927             }
2928         }
2929
2930     }
2931     else
2932     {
2933         for (; increment > 0; increment--)
2934         {
2935             if (edit->curs2 == 0)
2936                 return;
2937
2938             edit_push_undo_action (edit, CURS_LEFT);
2939
2940             c = edit_get_byte (edit, edit->curs1);
2941             if (!(edit->curs1 & M_EDIT_BUF_SIZE))
2942                 edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
2943             edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE] = c;
2944             edit->curs1++;
2945             c = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
2946                                                                      ((edit->curs2 -
2947                                                                        1) & M_EDIT_BUF_SIZE) - 1];
2948             if (!(edit->curs2 & M_EDIT_BUF_SIZE))
2949             {
2950                 g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
2951                 edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = 0;
2952             }
2953             edit->curs2--;
2954             if (c == '\n')
2955             {
2956                 edit->curs_line++;
2957                 edit->force |= REDRAW_LINE_ABOVE;
2958             }
2959         }
2960     }
2961 }
2962
2963 /* These functions return positions relative to lines */
2964
2965 /* --------------------------------------------------------------------------------------------- */
2966 /** returns index of last char on line + 1 */
2967
2968 off_t
2969 edit_eol (const WEdit * edit, off_t current)
2970 {
2971     if (current >= edit->last_byte)
2972         return edit->last_byte;
2973
2974     for (; edit_get_byte (edit, current) != '\n'; current++)
2975         ;
2976
2977     return current;
2978 }
2979
2980 /* --------------------------------------------------------------------------------------------- */
2981 /** returns index of first char on line */
2982
2983 off_t
2984 edit_bol (const WEdit * edit, off_t current)
2985 {
2986     if (current <= 0)
2987         return 0;
2988
2989     for (; edit_get_byte (edit, current - 1) != '\n'; current--)
2990         ;
2991
2992     return current;
2993 }
2994
2995 /* --------------------------------------------------------------------------------------------- */
2996
2997 long
2998 edit_count_lines (const WEdit * edit, off_t current, off_t upto)
2999 {
3000     long lines = 0;
3001
3002     if (upto > edit->last_byte)
3003         upto = edit->last_byte;
3004     if (current < 0)
3005         current = 0;
3006     while (current < upto)
3007         if (edit_get_byte (edit, current++) == '\n')
3008             lines++;
3009     return lines;
3010 }
3011
3012 /* --------------------------------------------------------------------------------------------- */
3013 /* If lines is zero this returns the count of lines from current to upto. */
3014 /* If upto is zero returns index of lines forward current. */
3015
3016 off_t
3017 edit_move_forward (const WEdit * edit, off_t current, long lines, off_t upto)
3018 {
3019     if (upto != 0)
3020     {
3021         return (off_t) edit_count_lines (edit, current, upto);
3022     }
3023     else
3024     {
3025         long next;
3026         if (lines < 0)
3027             lines = 0;
3028         while (lines-- != 0)
3029         {
3030             next = edit_eol (edit, current) + 1;
3031             if (next > edit->last_byte)
3032                 break;
3033             else
3034                 current = next;
3035         }
3036         return current;
3037     }
3038 }
3039
3040 /* --------------------------------------------------------------------------------------------- */
3041 /** Returns offset of 'lines' lines up from current */
3042
3043 off_t
3044 edit_move_backward (const WEdit * edit, off_t current, long lines)
3045 {
3046     if (lines < 0)
3047         lines = 0;
3048     current = edit_bol (edit, current);
3049     while (lines-- != 0 && current != 0)
3050         current = edit_bol (edit, current - 1);
3051     return current;
3052 }
3053
3054 /* --------------------------------------------------------------------------------------------- */
3055 /* If cols is zero this returns the count of columns from current to upto. */
3056 /* If upto is zero returns index of cols across from current. */
3057
3058 off_t
3059 edit_move_forward3 (const WEdit * edit, off_t current, long cols, off_t upto)
3060 {
3061     off_t p, q;
3062     long col;
3063
3064     if (upto != 0)
3065     {
3066         q = upto;
3067         cols = -10;
3068     }
3069     else
3070         q = edit->last_byte + 2;
3071
3072     for (col = 0, p = current; p < q; p++)
3073     {
3074         int c, orig_c;
3075
3076         if (cols != -10)
3077         {
3078             if (col == cols)
3079                 return p;
3080             if (col > cols)
3081                 return p - 1;
3082         }
3083
3084         orig_c = c = edit_get_byte (edit, p);
3085
3086 #ifdef HAVE_CHARSET
3087         if (edit->utf8)
3088         {
3089             int utf_ch;
3090             int cw = 1;
3091
3092             utf_ch = edit_get_utf (edit, p, &cw);
3093             if (mc_global.utf8_display)
3094             {
3095                 if (cw > 1)
3096                     col -= cw - 1;
3097                 if (g_unichar_iswide (utf_ch))
3098                     col++;
3099             }
3100             else if (cw > 1 && g_unichar_isprint (utf_ch))
3101                 col -= cw - 1;
3102         }
3103
3104         c = convert_to_display_c (c);
3105 #endif
3106
3107         if (c == '\n')
3108             return (upto != 0 ? (off_t) col : p);
3109         if (c == '\t')
3110             col += TAB_SIZE - col % TAB_SIZE;
3111         else if ((c < 32 || c == 127) && (orig_c == c
3112 #ifdef HAVE_CHARSET
3113                                           || (!mc_global.utf8_display && !edit->utf8)
3114 #endif
3115                  ))
3116             /* '\r' is shown as ^M, so we must advance 2 characters */
3117             /* Caret notation for control characters */
3118             col += 2;
3119         else
3120             col++;
3121     }
3122     return (off_t) col;
3123 }
3124
3125 /* --------------------------------------------------------------------------------------------- */
3126 /** returns the current column position of the cursor */
3127
3128 long
3129 edit_get_col (const WEdit * edit)
3130 {
3131     return (long) edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
3132 }
3133
3134 /* --------------------------------------------------------------------------------------------- */
3135 /* Scrolling functions */
3136 /* --------------------------------------------------------------------------------------------- */
3137
3138 void
3139 edit_update_curs_row (WEdit * edit)
3140 {
3141     edit->curs_row = edit->curs_line - edit->start_line;
3142 }
3143
3144 /* --------------------------------------------------------------------------------------------- */
3145
3146 void
3147 edit_update_curs_col (WEdit * edit)
3148 {
3149     edit->curs_col = (long) edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
3150 }
3151
3152 /* --------------------------------------------------------------------------------------------- */
3153
3154 long
3155 edit_get_curs_col (const WEdit * edit)
3156 {
3157     return edit->curs_col;
3158 }
3159
3160 /* --------------------------------------------------------------------------------------------- */
3161 /** moves the display start position up by i lines */
3162
3163 void
3164 edit_scroll_upward (WEdit * edit, long i)
3165 {
3166     long lines_above = edit->start_line;
3167
3168     if (i > lines_above)
3169         i = lines_above;
3170     if (i != 0)
3171     {
3172         edit->start_line -= i;
3173         edit->start_display = edit_move_backward (edit, edit->start_display, i);
3174         edit->force |= REDRAW_PAGE;
3175         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3176     }
3177     edit_update_curs_row (edit);
3178 }
3179
3180
3181 /* --------------------------------------------------------------------------------------------- */
3182
3183 void
3184 edit_scroll_downward (WEdit * edit, long i)
3185 {
3186     long lines_below;
3187
3188     lines_below = edit->total_lines - edit->start_line - (WIDGET (edit)->lines - 1);
3189     if (lines_below > 0)
3190     {
3191         if (i > lines_below)
3192             i = lines_below;
3193         edit->start_line += i;
3194         edit->start_display = edit_move_forward (edit, edit->start_display, i, 0);
3195         edit->force |= REDRAW_PAGE;
3196         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3197     }
3198     edit_update_curs_row (edit);
3199 }
3200
3201 /* --------------------------------------------------------------------------------------------- */
3202
3203 void
3204 edit_scroll_right (WEdit * edit, long i)
3205 {
3206     edit->force |= REDRAW_PAGE;
3207     edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3208     edit->start_col -= i;
3209 }
3210
3211 /* --------------------------------------------------------------------------------------------- */
3212
3213 void
3214 edit_scroll_left (WEdit * edit, long i)
3215 {
3216     if (edit->start_col)
3217     {
3218         edit->start_col += i;
3219         if (edit->start_col > 0)
3220             edit->start_col = 0;
3221         edit->force |= REDRAW_PAGE;
3222         edit->force &= (0xfff - REDRAW_CHAR_ONLY);
3223     }
3224 }
3225
3226 /* --------------------------------------------------------------------------------------------- */
3227 /* high level cursor movement commands */
3228 /* --------------------------------------------------------------------------------------------- */
3229
3230 void
3231 edit_move_to_prev_col (WEdit * edit, off_t p)
3232 {
3233     long prev = edit->prev_col;
3234     long over = edit->over_col;
3235
3236     edit_cursor_move (edit, edit_move_forward3 (edit, p, prev + edit->over_col, 0) - edit->curs1);
3237
3238     if (option_cursor_beyond_eol)
3239     {
3240         long line_len;
3241
3242         line_len = (long) edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0,
3243                                               edit_eol (edit, edit->curs1));
3244         if (line_len < prev + edit->over_col)
3245         {
3246             edit->over_col = prev + over - line_len;
3247             edit->prev_col = line_len;
3248             edit->curs_col = line_len;
3249         }
3250         else
3251         {
3252             edit->curs_col = prev + over;
3253             edit->prev_col = edit->curs_col;
3254             edit->over_col = 0;
3255         }
3256     }
3257     else
3258     {
3259         edit->over_col = 0;
3260         if (option_fake_half_tabs && is_in_indent (edit))
3261         {
3262             long fake_half_tabs;
3263
3264             edit_update_curs_col (edit);
3265
3266             fake_half_tabs = HALF_TAB_SIZE * space_width;
3267             if (fake_half_tabs != 0 && edit->curs_col % fake_half_tabs != 0)
3268             {
3269                 int q;
3270
3271                 q = edit->curs_col;
3272                 edit->curs_col -= (edit->curs_col % fake_half_tabs);
3273                 p = edit_bol (edit, edit->curs1);
3274                 edit_cursor_move (edit,
3275                                   edit_move_forward3 (edit, p, edit->curs_col, 0) - edit->curs1);
3276                 if (!left_of_four_spaces (edit))
3277                     edit_cursor_move (edit, edit_move_forward3 (edit, p, q, 0) - edit->curs1);
3278             }
3279         }
3280     }
3281 }
3282
3283 /* --------------------------------------------------------------------------------------------- */
3284 /** check whether line in editor is blank or not
3285  *
3286  * @param edit editor object
3287  * @param line number of line
3288  *
3289  * @return TRUE if line in blank, FALSE otherwise
3290  */
3291
3292 gboolean
3293 edit_line_is_blank (WEdit * edit, long line)
3294 {
3295     return is_blank (edit, edit_find_line (edit, line));
3296 }
3297
3298 /* --------------------------------------------------------------------------------------------- */
3299 /** move cursor to line 'line' */
3300
3301 void
3302 edit_move_to_line (WEdit * e, long line)
3303 {
3304     if (line < e->curs_line)
3305         edit_move_up (e, e->curs_line - line, 0);
3306     else
3307         edit_move_down (e, line - e->curs_line, 0);
3308     edit_scroll_screen_over_cursor (e);
3309 }
3310
3311 /* --------------------------------------------------------------------------------------------- */
3312 /** scroll window so that first visible line is 'line' */
3313
3314 void
3315 edit_move_display (WEdit * e, long line)
3316 {
3317     if (line < e->start_line)
3318         edit_scroll_upward (e, e->start_line - line);
3319     else
3320         edit_scroll_downward (e, line - e->start_line);
3321 }
3322
3323 /* --------------------------------------------------------------------------------------------- */
3324 /** save markers onto undo stack */
3325
3326 void
3327 edit_push_markers (WEdit * edit)
3328 {
3329     edit_push_undo_action (edit, MARK_1 + edit->mark1);
3330     edit_push_undo_action (edit, MARK_2 + edit->mark2);
3331     edit_push_undo_action (edit, MARK_CURS + edit->end_mark_curs);
3332 }
3333
3334 /* --------------------------------------------------------------------------------------------- */
3335
3336 void
3337 edit_set_markers (WEdit * edit, off_t m1, off_t m2, long c1, long c2)
3338 {
3339     edit->mark1 = m1;
3340     edit->mark2 = m2;
3341     edit->column1 = c1;
3342     edit->column2 = c2;
3343 }
3344
3345
3346 /* --------------------------------------------------------------------------------------------- */
3347 /** highlight marker toggle */
3348
3349 void
3350 edit_mark_cmd (WEdit * edit, gboolean unmark)
3351 {
3352     edit_push_markers (edit);
3353     if (unmark)
3354     {
3355         edit_set_markers (edit, 0, 0, 0, 0);
3356         edit->force |= REDRAW_PAGE;
3357     }
3358     else if (edit->mark2 >= 0)
3359     {
3360         edit->end_mark_curs = -1;
3361         edit_set_markers (edit, edit->curs1, -1, edit->curs_col + edit->over_col,
3362                           edit->curs_col + edit->over_col);
3363         edit->force |= REDRAW_PAGE;
3364     }
3365     else
3366     {
3367         edit->end_mark_curs = edit->curs1;
3368         edit_set_markers (edit, edit->mark1, edit->curs1, edit->column1,
3369                           edit->curs_col + edit->over_col);
3370     }
3371 }
3372
3373 /* --------------------------------------------------------------------------------------------- */
3374 /** highlight the word under cursor */
3375
3376 void
3377 edit_mark_current_word_cmd (WEdit * edit)
3378 {
3379     long pos;
3380
3381     for (pos = edit->curs1; pos != 0; pos--)
3382     {
3383         int c1, c2;
3384
3385         c1 = edit_get_byte (edit, pos);
3386         c2 = edit_get_byte (edit, pos - 1);
3387         if (!isspace (c1) && isspace (c2))
3388             break;
3389         if ((my_type_of (c1) & my_type_of (c2)) == 0)
3390             break;
3391     }
3392     edit->mark1 = pos;
3393
3394     for (; pos < edit->last_byte; pos++)
3395     {
3396         int c1, c2;
3397
3398         c1 = edit_get_byte (edit, pos);
3399         c2 = edit_get_byte (edit, pos + 1);
3400         if (!isspace (c1) && isspace (c2))
3401             break;
3402         if ((my_type_of (c1) & my_type_of (c2)) == 0)
3403             break;
3404     }
3405     edit->mark2 = min (pos + 1, edit->last_byte);
3406
3407     edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
3408 }
3409
3410 /* --------------------------------------------------------------------------------------------- */
3411
3412 void
3413 edit_mark_current_line_cmd (WEdit * edit)
3414 {
3415     long pos = edit->curs1;
3416
3417     edit->mark1 = edit_bol (edit, pos);
3418     edit->mark2 = edit_eol (edit, pos);
3419
3420     edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
3421 }
3422
3423 /* --------------------------------------------------------------------------------------------- */
3424
3425 void
3426 edit_delete_line (WEdit * edit)
3427 {
3428     /*
3429      * Delete right part of the line.
3430      * Note that edit_get_byte() returns '\n' when byte position is
3431      *   beyond EOF.
3432      */
3433     while (edit_get_byte (edit, edit->curs1) != '\n')
3434         (void) edit_delete (edit, TRUE);
3435
3436     /*
3437      * Delete '\n' char.
3438      * Note that edit_delete() will not corrupt anything if called while
3439      *   cursor position is EOF.
3440      */
3441     (void) edit_delete (edit, TRUE);
3442
3443     /*
3444      * Delete left part of the line.
3445      * Note, that edit_get_byte() returns '\n' when byte position is < 0.
3446      */
3447     while (edit_get_byte (edit, edit->curs1 - 1) != '\n')
3448         (void) edit_backspace (edit, TRUE);
3449 }
3450
3451 /* --------------------------------------------------------------------------------------------- */
3452
3453 long
3454 edit_indent_width (const WEdit * edit, off_t p)
3455 {
3456     off_t q = p;
3457
3458     /* move to the end of the leading whitespace of the line */
3459     while (strchr ("\t ", edit_get_byte (edit, q)) && q < edit->last_byte - 1)
3460         q++;
3461     /* count the number of columns of indentation */
3462     return (long) edit_move_forward3 (edit, p, 0, q);
3463 }
3464
3465 /* --------------------------------------------------------------------------------------------- */
3466
3467 void
3468 edit_insert_indent (WEdit * edit, int indent)
3469 {
3470     if (!option_fill_tabs_with_spaces)
3471     {
3472         while (indent >= TAB_SIZE)
3473         {
3474             edit_insert (edit, '\t');
3475             indent -= TAB_SIZE;
3476         }
3477     }
3478     while (indent-- > 0)
3479         edit_insert (edit, ' ');
3480 }
3481
3482 /* --------------------------------------------------------------------------------------------- */
3483
3484 void
3485 edit_push_key_press (WEdit * edit)
3486 {
3487     edit_push_undo_action (edit, KEY_PRESS + edit->start_display);
3488     if (edit->mark2 == -1)
3489     {
3490         edit_push_undo_action (edit, MARK_1 + edit->mark1);
3491         edit_push_undo_action (edit, MARK_CURS + edit->end_mark_curs);
3492     }
3493 }
3494
3495 /* --------------------------------------------------------------------------------------------- */
3496
3497 void
3498 edit_find_bracket (WEdit * edit)
3499 {
3500     edit->bracket = edit_get_bracket (edit, 1, 10000);
3501     if (last_bracket != edit->bracket)
3502         edit->force |= REDRAW_PAGE;
3503     last_bracket = edit->bracket;
3504 }
3505
3506 /* --------------------------------------------------------------------------------------------- */
3507 /**
3508  * This executes a command as though the user initiated it through a key
3509  * press.  Callback with MSG_KEY as a message calls this after
3510  * translating the key press.  This function can be used to pass any
3511  * command to the editor.  Note that the screen wouldn't update
3512  * automatically.  Either of command or char_for_insertion must be
3513  * passed as -1.  Commands are executed, and char_for_insertion is
3514  * inserted at the cursor.
3515  */
3516
3517 void
3518 edit_execute_key_command (WEdit * edit, unsigned long command, int char_for_insertion)
3519 {
3520     if (command == CK_MacroStartRecord || command == CK_RepeatStartRecord
3521         || (macro_index < 0
3522             && (command == CK_MacroStartStopRecord || command == CK_RepeatStartStopRecord)))
3523     {
3524         macro_index = 0;
3525         edit->force |= REDRAW_CHAR_ONLY | REDRAW_LINE;
3526         return;
3527     }
3528     if (macro_index != -1)
3529     {
3530         edit->force |= REDRAW_COMPLETELY;
3531         if (command == CK_MacroStopRecord || command == CK_MacroStartStopRecord)
3532         {
3533             edit_store_macro_cmd (edit);
3534             macro_index = -1;
3535             return;
3536         }
3537         if (command == CK_RepeatStopRecord || command == CK_RepeatStartStopRecord)
3538         {
3539             edit_repeat_macro_cmd (edit);
3540             macro_index = -1;
3541             return;
3542         }
3543     }
3544
3545     if (macro_index >= 0 && macro_index < MAX_MACRO_LENGTH - 1)
3546     {
3547         record_macro_buf[macro_index].action = command;
3548         record_macro_buf[macro_index++].ch = char_for_insertion;
3549     }
3550     /* record the beginning of a set of editing actions initiated by a key press */
3551     if (command != CK_Undo && command != CK_ExtendedKeyMap)
3552         edit_push_key_press (edit);
3553
3554     edit_execute_cmd (edit, command, char_for_insertion);
3555     if (edit->column_highlight)
3556         edit->force |= REDRAW_PAGE;
3557 }
3558
3559 /* --------------------------------------------------------------------------------------------- */
3560 /**
3561    This executes a command at a lower level than macro recording.
3562    It also does not push a key_press onto the undo stack. This means
3563    that if it is called many times, a single undo command will undo
3564    all of them. It also does not check for the Undo command.
3565  */
3566 void
3567 edit_execute_cmd (WEdit * edit, unsigned long command, int char_for_insertion)
3568 {
3569     Widget *w = WIDGET (edit);
3570
3571     if (command == CK_WindowFullscreen)
3572     {
3573         edit_toggle_fullscreen (edit);
3574         return;
3575     }
3576
3577     /* handle window state */
3578     if (edit_handle_move_resize (edit, command))
3579         return;
3580
3581     edit->force |= REDRAW_LINE;
3582
3583     /* The next key press will unhighlight the found string, so update
3584      * the whole page */
3585     if (edit->found_len || edit->column_highlight)
3586         edit->force |= REDRAW_PAGE;
3587
3588     switch (command)
3589     {
3590         /* a mark command with shift-arrow */
3591     case CK_MarkLeft:
3592     case CK_MarkRight:
3593     case CK_MarkToWordBegin:
3594     case CK_MarkToWordEnd:
3595     case CK_MarkToHome:
3596     case CK_MarkToEnd:
3597     case CK_MarkUp:
3598     case CK_MarkDown:
3599     case CK_MarkPageUp:
3600     case CK_MarkPageDown:
3601     case CK_MarkToFileBegin:
3602     case CK_MarkToFileEnd:
3603     case CK_MarkToPageBegin:
3604     case CK_MarkToPageEnd:
3605     case CK_MarkScrollUp:
3606     case CK_MarkScrollDown:
3607     case CK_MarkParagraphUp:
3608     case CK_MarkParagraphDown:
3609         /* a mark command with alt-arrow */
3610     case CK_MarkColumnPageUp:
3611     case CK_MarkColumnPageDown:
3612     case CK_MarkColumnLeft:
3613     case CK_MarkColumnRight:
3614     case CK_MarkColumnUp:
3615     case CK_MarkColumnDown:
3616     case CK_MarkColumnScrollUp:
3617     case CK_MarkColumnScrollDown:
3618     case CK_MarkColumnParagraphUp:
3619     case CK_MarkColumnParagraphDown:
3620         edit->column_highlight = 0;
3621         if (edit->highlight == 0 || (edit->mark2 != -1 && edit->mark1 != edit->mark2))
3622         {
3623             edit_mark_cmd (edit, TRUE); /* clear */
3624             edit_mark_cmd (edit, FALSE);        /* marking on */
3625         }
3626         edit->highlight = 1;
3627         break;
3628
3629         /* any other command */
3630     default:
3631         if (edit->highlight)
3632             edit_mark_cmd (edit, FALSE);        /* clear */
3633         edit->highlight = 0;
3634     }
3635
3636     /* first check for undo */
3637     if (command == CK_Undo)
3638     {
3639         edit->redo_stack_reset = 0;
3640         edit_group_undo (edit);
3641         edit->found_len = 0;
3642         edit->prev_col = edit_get_col (edit);
3643         edit->search_start = edit->curs1;
3644         return;
3645     }
3646     /*  check for redo */
3647     if (command == CK_Redo)
3648     {
3649         edit->redo_stack_reset = 0;
3650         edit_do_redo (edit);
3651         edit->found_len = 0;
3652         edit->prev_col = edit_get_col (edit);
3653         edit->search_start = edit->curs1;
3654         return;
3655     }
3656
3657     edit->redo_stack_reset = 1;
3658
3659     /* An ordinary key press */
3660     if (char_for_insertion >= 0)
3661     {
3662         /* if non persistent selection and text selected */
3663         if (!option_persistent_selections && edit->mark1 != edit->mark2)
3664             edit_block_delete_cmd (edit);
3665
3666         if (edit->overwrite)
3667         {
3668             /* remove char only one time, after input first byte, multibyte chars */
3669 #ifdef HAVE_CHARSET
3670             if (!mc_global.utf8_display || edit->charpoint == 0)
3671 #endif
3672                 if (edit_get_byte (edit, edit->curs1) != '\n')
3673
3674                     edit_delete (edit, FALSE);
3675         }
3676         if (option_cursor_beyond_eol && edit->over_col > 0)
3677             edit_insert_over (edit);
3678 #ifdef HAVE_CHARSET
3679         if (char_for_insertion > 255 && !mc_global.utf8_display)
3680         {
3681             unsigned char str[6 + 1];
3682             size_t i = 0;
3683             int res;
3684
3685             res = g_unichar_to_utf8 (char_for_insertion, (char *) str);
3686             if (res == 0)
3687             {
3688                 str[0] = '.';
3689                 str[1] = '\0';
3690             }
3691             else
3692             {
3693                 str[res] = '\0';
3694             }
3695             while (str[i] != 0 && i <= 6)
3696             {
3697                 char_for_insertion = str[i];
3698                 edit_insert (edit, char_for_insertion);
3699                 i++;
3700             }
3701         }
3702         else
3703 #endif
3704             edit_insert (edit, char_for_insertion);
3705
3706         if (option_auto_para_formatting)
3707         {
3708             format_paragraph (edit, 0);
3709             edit->force |= REDRAW_PAGE;
3710         }
3711         else
3712             check_and_wrap_line (edit);
3713         edit->found_len = 0;
3714         edit->prev_col = edit_get_col (edit);
3715         edit->search_start = edit->curs1;
3716         edit_find_bracket (edit);
3717         return;
3718     }
3719
3720     switch (command)
3721     {
3722     case CK_TopOnScreen:
3723     case CK_BottomOnScreen:
3724     case CK_Top:
3725     case CK_Bottom:
3726     case CK_PageUp:
3727     case CK_PageDown:
3728     case CK_Home:
3729     case CK_End:
3730     case CK_Up:
3731     case CK_Down:
3732     case CK_Left:
3733     case CK_Right:
3734     case CK_WordLeft:
3735     case CK_WordRight:
3736         if (!option_persistent_selections && edit->mark2 >= 0)
3737         {
3738             if (edit->column_highlight)
3739                 edit_push_undo_action (edit, COLUMN_ON);
3740             edit->column_highlight = 0;
3741             edit_mark_cmd (edit, TRUE);
3742         }
3743     }
3744
3745     switch (command)
3746     {
3747     case CK_TopOnScreen:
3748     case CK_BottomOnScreen:
3749     case CK_MarkToPageBegin:
3750     case CK_MarkToPageEnd:
3751     case CK_Up:
3752     case CK_Down:
3753     case CK_WordLeft:
3754     case CK_WordRight:
3755     case CK_MarkToWordBegin:
3756     case CK_MarkToWordEnd:
3757     case CK_MarkUp:
3758     case CK_MarkDown:
3759     case CK_MarkColumnUp:
3760     case CK_MarkColumnDown:
3761         if (edit->mark2 == -1)
3762             break;              /*marking is following the cursor: may need to highlight a whole line */
3763     case CK_Left:
3764     case CK_Right:
3765     case CK_MarkLeft:
3766     case CK_MarkRight:
3767         edit->force |= REDRAW_CHAR_ONLY;
3768     }
3769
3770     /* basic cursor key commands */
3771     switch (command)
3772     {
3773     case CK_BackSpace:
3774         /* if non persistent selection and text selected */
3775         if (!option_persistent_selections && edit->mark1 != edit->mark2)
3776             edit_block_delete_cmd (edit);
3777         else if (option_cursor_beyond_eol && edit->over_col > 0)
3778             edit->over_col--;
3779         else if (option_backspace_through_tabs && is_in_indent (edit))
3780         {
3781             while (edit_get_byte (edit, edit->curs1 - 1) != '\n' && edit->curs1 > 0)
3782                 edit_backspace (edit, TRUE);
3783         }
3784         else if (option_fake_half_tabs && is_in_indent (edit) && right_of_four_spaces (edit))
3785         {
3786             int i;
3787
3788             for (i = 0; i < HALF_TAB_SIZE; i++)
3789                 edit_backspace (edit, TRUE);
3790         }
3791         else
3792             edit_backspace (edit, FALSE);
3793         break;
3794     case CK_Delete:
3795         /* if non persistent selection and text selected */
3796         if (!option_persistent_selections && edit->mark1 != edit->mark2)
3797             edit_block_delete_cmd (edit);
3798         else
3799         {
3800             if (option_cursor_beyond_eol && edit->over_col > 0)
3801                 edit_insert_over (edit);
3802
3803             if (option_fake_half_tabs && is_in_indent (edit) && left_of_four_spaces (edit))
3804             {
3805                 int i;
3806
3807                 for (i = 1; i <= HALF_TAB_SIZE; i++)
3808                     edit_delete (edit, TRUE);
3809             }
3810             else
3811                 edit_delete (edit, FALSE);
3812         }
3813         break;
3814     case CK_DeleteToWordBegin:
3815         edit->over_col = 0;
3816         edit_left_delete_word (edit);
3817         break;
3818     case CK_DeleteToWordEnd:
3819         if (option_cursor_beyond_eol && edit->over_col > 0)
3820             edit_insert_over (edit);
3821
3822         edit_right_delete_word (edit);
3823         break;
3824     case CK_DeleteLine:
3825         edit_delete_line (edit);
3826         break;
3827     case CK_DeleteToHome:
3828         edit_delete_to_line_begin (edit);
3829         break;
3830     case CK_DeleteToEnd:
3831         edit_delete_to_line_end (edit);
3832         break;
3833     case CK_Enter:
3834         edit->over_col = 0;
3835         if (option_auto_para_formatting)
3836         {
3837             edit_double_newline (edit);
3838             if (option_return_does_auto_indent)
3839                 edit_auto_indent (edit);
3840             format_paragraph (edit, 0);
3841         }
3842         else
3843         {
3844             edit_insert (edit, '\n');
3845             if (option_return_does_auto_indent)
3846                 edit_auto_indent (edit);
3847         }
3848         break;
3849     case CK_Return:
3850         edit_insert (edit, '\n');
3851         break;
3852
3853     case CK_MarkColumnPageUp:
3854         edit->column_highlight = 1;
3855     case CK_PageUp:
3856     case CK_MarkPageUp:
3857         edit_move_up (edit, w->lines - 1, 1);
3858         break;
3859     case CK_MarkColumnPageDown:
3860         edit->column_highlight = 1;
3861     case CK_PageDown:
3862     case CK_MarkPageDown:
3863         edit_move_down (edit, w->lines - 1, 1);
3864         break;
3865     case CK_MarkColumnLeft:
3866         edit->column_highlight = 1;
3867     case CK_Left:
3868     case CK_MarkLeft:
3869         if (option_fake_half_tabs && is_in_indent (edit) && right_of_four_spaces (edit))
3870         {
3871             if (option_cursor_beyond_eol && edit->over_col > 0)
3872                 edit->over_col--;
3873             else
3874                 edit_cursor_move (edit, -HALF_TAB_SIZE);
3875             edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
3876         }
3877         else
3878             edit_left_char_move_cmd (edit);
3879         break;
3880     case CK_MarkColumnRight:
3881         edit->column_highlight = 1;
3882     case CK_Right:
3883     case CK_MarkRight:
3884         if (option_fake_half_tabs && is_in_indent (edit) && left_of_four_spaces (edit))
3885         {
3886             edit_cursor_move (edit, HALF_TAB_SIZE);
3887             edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
3888         }
3889         else
3890             edit_right_char_move_cmd (edit);
3891         break;
3892     case CK_TopOnScreen:
3893     case CK_MarkToPageBegin:
3894         edit_begin_page (edit);
3895         break;
3896     case CK_BottomOnScreen:
3897     case CK_MarkToPageEnd:
3898         edit_end_page (edit);
3899         break;
3900     case CK_WordLeft:
3901     case CK_MarkToWordBegin:
3902         edit->over_col = 0;
3903         edit_left_word_move_cmd (edit);
3904         break;
3905     case CK_WordRight:
3906     case CK_MarkToWordEnd:
3907         edit->over_col = 0;
3908         edit_right_word_move_cmd (edit);
3909         break;
3910     case CK_MarkColumnUp:
3911         edit->column_highlight = 1;
3912     case CK_Up:
3913     case CK_MarkUp:
3914         edit_move_up (edit, 1, 0);
3915         break;
3916     case CK_MarkColumnDown:
3917         edit->column_highlight = 1;
3918     case CK_Down:
3919     case CK_MarkDown:
3920         edit_move_down (edit, 1, 0);
3921         break;
3922     case CK_MarkColumnParagraphUp:
3923         edit->column_highlight = 1;
3924     case CK_ParagraphUp:
3925     case CK_MarkParagraphUp:
3926         edit_move_up_paragraph (edit, 0);
3927         break;
3928     case CK_MarkColumnParagraphDown:
3929         edit->column_highlight = 1;
3930     case CK_ParagraphDown:
3931     case CK_MarkParagraphDown:
3932         edit_move_down_paragraph (edit, 0);
3933         break;
3934     case CK_MarkColumnScrollUp:
3935         edit->column_highlight = 1;
3936     case CK_ScrollUp:
3937     case CK_MarkScrollUp:
3938         edit_move_up (edit, 1, 1);
3939         break;
3940     case CK_MarkColumnScrollDown:
3941         edit->column_highlight = 1;
3942     case CK_ScrollDown:
3943     case CK_MarkScrollDown:
3944         edit_move_down (edit, 1, 1);
3945         break;
3946     case CK_Home:
3947     case CK_MarkToHome:
3948         edit_cursor_to_bol (edit);
3949         break;
3950     case CK_End:
3951     case CK_MarkToEnd:
3952         edit_cursor_to_eol (edit);
3953         break;
3954     case CK_Tab:
3955         /* if text marked shift block */
3956         if (edit->mark1 != edit->mark2 && !option_persistent_selections)
3957         {
3958             if (edit->mark2 < 0)
3959                 edit_mark_cmd (edit, FALSE);
3960             edit_move_block_to_right (edit);
3961         }
3962         else
3963         {
3964             if (option_cursor_beyond_eol)
3965                 edit_insert_over (edit);
3966             edit_tab_cmd (edit);
3967             if (option_auto_para_formatting)
3968             {
3969                 format_paragraph (edit, 0);
3970                 edit->force |= REDRAW_PAGE;
3971             }
3972             else
3973                 check_and_wrap_line (edit);
3974         }
3975         break;
3976
3977     case CK_InsertOverwrite:
3978         edit->overwrite = !edit->overwrite;
3979         break;
3980
3981     case CK_Mark:
3982         if (edit->mark2 >= 0)
3983         {
3984             if (edit->column_highlight)
3985                 edit_push_undo_action (edit, COLUMN_ON);
3986             edit->column_highlight = 0;
3987         }
3988         edit_mark_cmd (edit, FALSE);
3989         break;
3990     case CK_MarkColumn:
3991         if (!edit->column_highlight)
3992             edit_push_undo_action (edit, COLUMN_OFF);
3993         edit->column_highlight = 1;
3994         edit_mark_cmd (edit, FALSE);
3995         break;
3996     case CK_MarkAll:
3997         edit_set_markers (edit, 0, edit->last_byte, 0, 0);
3998         edit->force |= REDRAW_PAGE;
3999         break;
4000     case CK_Unmark:
4001         if (edit->column_highlight)
4002             edit_push_undo_action (edit, COLUMN_ON);
4003         edit->column_highlight = 0;
4004         edit_mark_cmd (edit, TRUE);
4005         break;
4006     case CK_MarkWord:
4007         if (edit->column_highlight)
4008             edit_push_undo_action (edit, COLUMN_ON);
4009         edit->column_highlight = 0;
4010         edit_mark_current_word_cmd (edit);
4011         break;
4012     case CK_MarkLine:
4013         if (edit->column_highlight)
4014             edit_push_undo_action (edit, COLUMN_ON);
4015         edit->column_highlight = 0;
4016         edit_mark_current_line_cmd (edit);
4017         break;
4018
4019     case CK_Bookmark:
4020         book_mark_clear (edit, edit->curs_line, BOOK_MARK_FOUND_COLOR);
4021         if (book_mark_query_color (edit, edit->curs_line, BOOK_MARK_COLOR))
4022             book_mark_clear (edit, edit->curs_line, BOOK_MARK_COLOR);
4023         else
4024             book_mark_insert (edit, edit->curs_line, BOOK_MARK_COLOR);
4025         break;
4026     case CK_BookmarkFlush:
4027         book_mark_flush (edit, BOOK_MARK_COLOR);
4028         book_mark_flush (edit, BOOK_MARK_FOUND_COLOR);
4029         edit->force |= REDRAW_PAGE;
4030         break;
4031     case CK_BookmarkNext:
4032         if (edit->book_mark != NULL)
4033         {
4034             edit_book_mark_t *p;
4035
4036             p = book_mark_find (edit, edit->curs_line);
4037             if (p->next != NULL)
4038             {
4039                 p = p->next;
4040                 if (p->line >= edit->start_line + w->lines || p->line < edit->start_line)
4041                     edit_move_display (edit, p->line - w->lines / 2);
4042                 edit_move_to_line (edit, p->line);
4043             }
4044         }
4045         break;
4046     case CK_BookmarkPrev:
4047         if (edit->book_mark != NULL)
4048         {
4049             edit_book_mark_t *p;
4050
4051             p = book_mark_find (edit, edit->curs_line);
4052             while (p->line == edit->curs_line)
4053                 if (p->prev != NULL)
4054                     p = p->prev;
4055             if (p->line >= 0)
4056             {
4057                 if (p->line >= edit->start_line + w->lines || p->line < edit->start_line)
4058                     edit_move_display (edit, p->line - w->lines / 2);
4059                 edit_move_to_line (edit, p->line);
4060             }
4061         }
4062         break;
4063
4064     case CK_Top:
4065     case CK_MarkToFileBegin:
4066         edit_move_to_top (edit);
4067         break;
4068     case CK_Bottom:
4069     case CK_MarkToFileEnd:
4070         edit_move_to_bottom (edit);
4071         break;
4072
4073     case CK_Copy:
4074         if (option_cursor_beyond_eol && edit->over_col > 0)
4075             edit_insert_over (edit);
4076         edit_block_copy_cmd (edit);
4077         break;
4078     case CK_Remove:
4079         edit_block_delete_cmd (edit);
4080         break;
4081     case CK_Move:
4082         edit_block_move_cmd (edit);
4083         break;
4084
4085     case CK_BlockShiftLeft:
4086         if (edit->mark1 != edit->mark2)
4087             edit_move_block_to_left (edit);
4088         break;
4089     case CK_BlockShiftRight:
4090         if (edit->mark1 != edit->mark2)
4091             edit_move_block_to_right (edit);
4092         break;
4093     case CK_Store:
4094         edit_copy_to_X_buf_cmd (edit);
4095         break;
4096     case CK_Cut:
4097         edit_cut_to_X_buf_cmd (edit);
4098         break;
4099     case CK_Paste:
4100         /* if non persistent selection and text selected */
4101         if (!option_persistent_selections && edit->mark1 != edit->mark2)
4102             edit_block_delete_cmd (edit);
4103         if (option_cursor_beyond_eol && edit->over_col > 0)
4104             edit_insert_over (edit);
4105         edit_paste_from_X_buf_cmd (edit);
4106         if (!option_persistent_selections && edit->mark2 >= 0)
4107         {
4108             if (edit->column_highlight)
4109                 edit_push_undo_action (edit, COLUMN_ON);
4110             edit->column_highlight = 0;
4111             edit_mark_cmd (edit, TRUE);
4112         }
4113         break;
4114     case CK_History:
4115         edit_paste_from_history (edit);
4116         break;
4117
4118     case CK_SaveAs:
4119         edit_save_as_cmd (edit);
4120         break;
4121     case CK_Save:
4122         edit_save_confirm_cmd (edit);
4123         break;
4124     case CK_BlockSave:
4125         edit_save_block_cmd (edit);
4126         break;
4127     case CK_InsertFile:
4128         edit_insert_file_cmd (edit);
4129         break;
4130
4131     case CK_FilePrev:
4132         edit_load_back_cmd (edit);
4133         break;
4134     case CK_FileNext:
4135         edit_load_forward_cmd (edit);
4136         break;
4137
4138     case CK_SyntaxChoose:
4139         edit_syntax_dialog (edit);
4140         break;
4141
4142     case CK_Search:
4143         edit_search_cmd (edit, FALSE);
4144         break;
4145     case CK_SearchContinue:
4146         edit_search_cmd (edit, TRUE);
4147         break;
4148     case CK_Replace:
4149         edit_replace_cmd (edit, 0);
4150         break;
4151     case CK_ReplaceContinue:
4152         edit_replace_cmd (edit, 1);
4153         break;
4154     case CK_Complete:
4155         /* if text marked shift block */
4156         if (edit->mark1 != edit->mark2 && !option_persistent_selections)
4157             edit_move_block_to_left (edit);
4158         else
4159             edit_complete_word_cmd (edit);
4160         break;
4161     case CK_Find:
4162         edit_get_match_keyword_cmd (edit);
4163         break;
4164
4165 #ifdef HAVE_ASPELL
4166     case CK_SpellCheckCurrentWord:
4167         edit_suggest_current_word (edit);
4168         break;
4169     case CK_SpellCheck:
4170         edit_spellcheck_file (edit);
4171         break;
4172     case CK_SpellCheckSelectLang:
4173         edit_set_spell_lang ();
4174         break;
4175 #endif
4176
4177     case CK_Date:
4178         {
4179             char s[BUF_MEDIUM];
4180             /* fool gcc to prevent a Y2K warning */
4181             char time_format[] = "_c";
4182             time_format[0] = '%';
4183
4184             FMT_LOCALTIME_CURRENT (s, sizeof (s), time_format);
4185             edit_print_string (edit, s);
4186             edit->force |= REDRAW_PAGE;
4187         }
4188         break;
4189     case CK_Goto:
4190         edit_goto_cmd (edit);
4191         break;
4192     case CK_ParagraphFormat:
4193         format_paragraph (edit, 1);
4194         edit->force |= REDRAW_PAGE;
4195         break;
4196     case CK_MacroDelete:
4197         edit_delete_macro_cmd (edit);
4198         break;
4199     case CK_MatchBracket:
4200         edit_goto_matching_bracket (edit);
4201         break;
4202     case CK_UserMenu:
4203         user_menu (edit, NULL, -1);
4204         break;
4205     case CK_Sort:
4206         edit_sort_cmd (edit);
4207         break;
4208     case CK_ExternalCommand:
4209         edit_ext_cmd (edit);
4210         break;
4211     case CK_Mail:
4212         edit_mail_dialog (edit);
4213         break;
4214 #ifdef HAVE_CHARSET
4215     case CK_SelectCodepage:
4216         edit_select_codepage_cmd (edit);
4217         break;
4218 #endif
4219     case CK_InsertLiteral:
4220         edit_insert_literal_cmd (edit);
4221         break;
4222     case CK_MacroStartStopRecord:
4223         edit_begin_end_macro_cmd (edit);
4224         break;
4225     case CK_RepeatStartStopRecord:
4226         edit_begin_end_repeat_cmd (edit);
4227         break;
4228     case CK_ExtendedKeyMap:
4229         edit->extmod = TRUE;
4230         break;
4231     default:
4232         break;
4233     }
4234
4235     /* CK_PipeBlock */
4236     if ((command / CK_PipeBlock (0)) == 1)
4237         edit_block_process_cmd (edit, command - CK_PipeBlock (0));
4238
4239     /* keys which must set the col position, and the search vars */
4240     switch (command)
4241     {
4242     case CK_Search:
4243     case CK_SearchContinue:
4244     case CK_Replace:
4245     case CK_ReplaceContinue:
4246     case CK_Complete:
4247         edit->prev_col = edit_get_col (edit);
4248         break;
4249     case CK_Up:
4250     case CK_MarkUp:
4251     case CK_MarkColumnUp:
4252     case CK_Down:
4253     case CK_MarkDown:
4254     case CK_MarkColumnDown:
4255     case CK_PageUp:
4256     case CK_MarkPageUp:
4257     case CK_MarkColumnPageUp:
4258     case CK_PageDown:
4259     case CK_MarkPageDown:
4260     case CK_MarkColumnPageDown:
4261     case CK_Top:
4262     case CK_MarkToFileBegin:
4263     case CK_Bottom:
4264     case CK_MarkToFileEnd:
4265     case CK_ParagraphUp:
4266     case CK_MarkParagraphUp:
4267     case CK_MarkColumnParagraphUp:
4268     case CK_ParagraphDown:
4269     case CK_MarkParagraphDown:
4270     case CK_MarkColumnParagraphDown:
4271     case CK_ScrollUp:
4272     case CK_MarkScrollUp:
4273     case CK_MarkColumnScrollUp:
4274     case CK_ScrollDown:
4275     case CK_MarkScrollDown:
4276     case CK_MarkColumnScrollDown:
4277         edit->search_start = edit->curs1;
4278         edit->found_len = 0;
4279         break;
4280     default:
4281         edit->found_len = 0;
4282         edit->prev_col = edit_get_col (edit);
4283         edit->search_start = edit->curs1;
4284     }
4285     edit_find_bracket (edit);
4286
4287     if (option_auto_para_formatting)
4288     {
4289         switch (command)
4290         {
4291         case CK_BackSpace:
4292         case CK_Delete:
4293         case CK_DeleteToWordBegin:
4294         case CK_DeleteToWordEnd:
4295         case CK_DeleteToHome:
4296         case CK_DeleteToEnd:
4297             format_paragraph (edit, 0);
4298             edit->force |= REDRAW_PAGE;
4299         }
4300     }
4301 }
4302
4303 /* --------------------------------------------------------------------------------------------- */
4304
4305 void
4306 edit_stack_init (void)
4307 {
4308     for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
4309     {
4310         edit_history_moveto[edit_stack_iterator].filename_vpath = NULL;
4311         edit_history_moveto[edit_stack_iterator].line = -1;
4312     }
4313
4314     edit_stack_iterator = 0;
4315 }
4316
4317 /* --------------------------------------------------------------------------------------------- */
4318
4319 void
4320 edit_stack_free (void)
4321 {
4322     for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
4323         vfs_path_free (edit_history_moveto[edit_stack_iterator].filename_vpath);
4324 }
4325
4326 /* --------------------------------------------------------------------------------------------- */
4327 /** move i lines */
4328
4329 void
4330 edit_move_up (WEdit * edit, long i, gboolean do_scroll)
4331 {
4332     edit_move_updown (edit, i, do_scroll, TRUE);
4333 }
4334
4335 /* --------------------------------------------------------------------------------------------- */
4336 /** move i lines */
4337
4338 void
4339 edit_move_down (WEdit * edit, long i, gboolean do_scroll)
4340 {
4341     edit_move_updown (edit, i, do_scroll, FALSE);
4342 }
4343
4344 /* --------------------------------------------------------------------------------------------- */