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