src/editor/edit.c

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