Refactored IPV4/IPV6 FTP connection setup code

[midnight-commander.git] / src / editor / edit.c

/* editor low level data handling and cursor fundamentals.

   Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   2007 Free Software Foundation, Inc.

   Authors: 1996, 1997 Paul Sheer

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
   02110-1301, USA.
 */

/** \file
 *  \brief Source: editor low level data handling and cursor fundamentals
 *  \author Paul Sheer
 *  \date 1996, 1997
 */

#include <config.h>
#include <stdio.h>
#include <stdarg.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <fcntl.h>

#include "lib/global.h"

#include "lib/tty/color.h"
#include "lib/tty/tty.h"        /* attrset() */
#include "lib/tty/key.h"        /* is_idle() */
#include "lib/skin.h"           /* EDITOR_NORMAL_COLOR */
#include "lib/vfs/mc-vfs/vfs.h"
#include "lib/strutil.h"        /* utf string functions */
#include "lib/timefmt.h"        /* time formatting */
#include "lib/lock.h"

#include "src/widget.h"
#include "src/cmd.h"            /* view_other_cmd() */
#include "src/user.h"           /* user_menu_cmd() */
#include "src/wtools.h"         /* query_dialog() */
#include "src/charsets.h"       /* get_codepage_id */
#include "src/main.h"           /* source_codepage */
#include "src/setup.h"          /* option_tab_spacing */
#include "src/learn.h"          /* learn_keys */
#include "src/cmddef.h"
#include "src/keybind.h"

#include "edit-impl.h"
#include "edit-widget.h"

int option_word_wrap_line_length = DEFAULT_WRAP_LINE_LENGTH;
int option_typewriter_wrap = 0;
int option_auto_para_formatting = 0;
int option_fill_tabs_with_spaces = 0;
int option_return_does_auto_indent = 1;
int option_backspace_through_tabs = 0;
int option_fake_half_tabs = 1;
int option_save_mode = EDIT_QUICK_SAVE;
int option_save_position = 1;
int option_max_undo = 32768;
int option_persistent_selections = 1;
int option_cursor_beyond_eol = 0;
int option_line_state = 0;
int option_line_state_width = 0;

int option_edit_right_extreme = 0;
int option_edit_left_extreme = 0;
int option_edit_top_extreme = 0;
int option_edit_bottom_extreme = 0;
int enable_show_tabs_tws = 1;
int option_check_nl_at_eof = 0;
int show_right_margin = 0;

const char *option_whole_chars_search = "0123456789abcdefghijklmnopqrstuvwxyz_";
char *option_backup_ext = NULL;

int edit_stack_iterator = 0;
edit_stack_type edit_history_moveto[MAX_HISTORY_MOVETO];
/* magic sequense for say than block is vertical */
const char VERTICAL_MAGIC[] = { '\1', '\1', '\1', '\1', '\n' };

/*-
 *
 * here's a quick sketch of the layout: (don't run this through indent.)
 *
 * (b1 is buffers1 and b2 is buffers2)
 *
 *                                       |
 * \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
 * ______________________________________|______________________________________
 *                                       |
 * ...  |  b2[2]   |  b2[1]   |  b2[0]   |  b1[0]   |  b1[1]   |  b1[2]   | ...
 *      |->        |->        |->        |->        |->        |->        |
 *                                       |
 *           _<------------------------->|<----------------->_
 *                   WEdit->curs2        |   WEdit->curs1
 *           ^                           |                   ^
 *           |                          ^|^                  |
 *         cursor                       |||                cursor
 *                                      |||
 *                              file end|||file beginning
 *                                       |
 *                                       |
 *
 *           _
 * This_is_some_file
 * fin.
 */

static void user_menu (WEdit * edit);

static void
edit_about (void)
{
    const char *header = N_("About");
    const char *button_name = N_("&OK");
    const char * const version = "MCEdit " VERSION;
    char text[BUF_LARGE];

    int win_len, version_len, button_len;
    int cols, lines;

    Dlg_head *about_dlg;

#ifdef ENABLE_NLS
    header = _(header);
    button_name = _(button_name);
#endif

    button_len = str_term_width1 (button_name) + 5;
    version_len = str_term_width1 (version);

    g_snprintf (text, sizeof (text),
                _("Copyright (C) 1996-2010 the Free Software Foundation\n\n"
                  "            A user friendly text editor\n"
                  "         written for the Midnight Commander"));

    win_len = str_term_width1 (header);
    win_len = max (win_len, version_len);
    win_len = max (win_len, button_len);

    /* count width and height of text */
    str_msg_term_size (text, &lines, &cols);
    lines += 9;
    cols = max (win_len, cols) + 6;

    /* dialog */
    about_dlg = create_dlg (TRUE, 0, 0, lines, cols, dialog_colors, NULL,
                            "[Internal File Editor]", header, DLG_CENTER | DLG_TRYUP);

    add_widget (about_dlg, label_new (3, (cols - version_len)/2, version));
    add_widget (about_dlg, label_new (5, 3, text));
    add_widget (about_dlg, button_new (lines - 3, (cols - button_len)/2,
                                       B_ENTER, NORMAL_BUTTON, button_name, NULL));

    run_dlg (about_dlg);
    destroy_dlg (about_dlg);
}

int
edit_get_byte (WEdit * edit, long byte_index)
{
    unsigned long p;
    if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
        return '\n';

    if (byte_index >= edit->curs1)
    {
        p = edit->curs1 + edit->curs2 - byte_index - 1;
        return edit->buffers2[p >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1];
    }
    else
    {
        return edit->buffers1[byte_index >> S_EDIT_BUF_SIZE][byte_index & M_EDIT_BUF_SIZE];
    }
}

char *
edit_get_byte_ptr (WEdit * edit, long byte_index)
{
    unsigned long p;
    if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
        return NULL;

    if (byte_index >= edit->curs1)
    {
        p = edit->curs1 + edit->curs2 - byte_index - 1;
        return (char *) (edit->buffers2[p >> S_EDIT_BUF_SIZE] +
                         (EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1));
    }
    else
    {
        return (char *) (edit->buffers1[byte_index >> S_EDIT_BUF_SIZE] +
                         (byte_index & M_EDIT_BUF_SIZE));
    }
}

char *
edit_get_buf_ptr (WEdit * edit, long byte_index)
{
    unsigned long p;

    if (byte_index >= (edit->curs1 + edit->curs2))
        byte_index--;

    if (byte_index < 0)
        return NULL;

    if (byte_index >= edit->curs1)
    {
        p = edit->curs1 + edit->curs2 - 1;
        return (char *) (edit->buffers2[p >> S_EDIT_BUF_SIZE] +
                         (EDIT_BUF_SIZE - (p & M_EDIT_BUF_SIZE) - 1));
    }
    else
    {
        return (char *) (edit->buffers1[byte_index >> S_EDIT_BUF_SIZE] + (0 & M_EDIT_BUF_SIZE));
    }
}

int
edit_get_utf (WEdit * edit, long byte_index, int *char_width)
{
    gchar *str = NULL;
    int res = -1;
    gunichar ch;
    gchar *next_ch = NULL;
    int width = 0;

    if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
    {
        *char_width = 0;
        return '\n';
    }

    str = edit_get_byte_ptr (edit, byte_index);

    if (str == NULL)
    {
        *char_width = 0;
        return 0;
    }

    res = g_utf8_get_char_validated (str, -1);

    if (res < 0)
    {
        ch = *str;
        width = 0;
    }
    else
    {
        ch = res;
        /* Calculate UTF-8 char width */
        next_ch = g_utf8_next_char (str);
        if (next_ch)
        {
            width = next_ch - str;
        }
        else
        {
            ch = 0;
            width = 0;
        }
    }
    *char_width = width;
    return ch;
}

int
edit_get_prev_utf (WEdit * edit, long byte_index, int *char_width)
{
    gchar *str, *buf = NULL;
    int res = -1;
    gunichar ch;
    gchar *next_ch = NULL;
    int width = 0;

    if (byte_index > 0)
        byte_index--;

    if (byte_index >= (edit->curs1 + edit->curs2) || byte_index < 0)
    {
        *char_width = 0;
        return 0;
    }

    ch = edit_get_utf (edit, byte_index, &width);

    if (width == 1)
    {
        *char_width = width;
        return ch;
    }

    str = edit_get_byte_ptr (edit, byte_index);
    buf = edit_get_buf_ptr (edit, byte_index);
    if (str == NULL || buf == NULL)
    {
        *char_width = 0;
        return 0;
    }
    /* get prev utf8 char */
    if (str != buf)
        str = g_utf8_find_prev_char (buf, str);

    res = g_utf8_get_char_validated (str, -1);

    if (res < 0)
    {
        ch = *str;
        width = 0;
    }
    else
    {
        ch = res;
        /* Calculate UTF-8 char width */
        next_ch = g_utf8_next_char (str);
        if (next_ch)
        {
            width = next_ch - str;
        }
        else
        {
            ch = 0;
            width = 0;
        }
    }
    *char_width = width;
    return ch;
}

/*
 * Initialize the buffers for an empty files.
 */
static void
edit_init_buffers (WEdit * edit)
{
    int j;

    for (j = 0; j <= MAXBUFF; j++)
    {
        edit->buffers1[j] = NULL;
        edit->buffers2[j] = NULL;
    }

    edit->curs1 = 0;
    edit->curs2 = 0;
    edit->buffers2[0] = g_malloc0 (EDIT_BUF_SIZE);
}

/*
 * Load file OR text into buffers.  Set cursor to the beginning of file.
 * Return 1 on error.
 */
static int
edit_load_file_fast (WEdit * edit, const char *filename)
{
    long buf, buf2;
    int file = -1;
    int ret = 1;

    edit->curs2 = edit->last_byte;
    buf2 = edit->curs2 >> S_EDIT_BUF_SIZE;

    file = mc_open (filename, O_RDONLY | O_BINARY);
    if (file == -1)
    {
        gchar *errmsg;

        errmsg = g_strdup_printf (_("Cannot open %s for reading"), filename);
        edit_error_dialog (_("Error"), errmsg);
        g_free (errmsg);
        return 1;
    }

    if (!edit->buffers2[buf2])
        edit->buffers2[buf2] = g_malloc0 (EDIT_BUF_SIZE);

    do
    {
        if (mc_read (file,
                     (char *) edit->buffers2[buf2] + EDIT_BUF_SIZE -
                     (edit->curs2 & M_EDIT_BUF_SIZE), edit->curs2 & M_EDIT_BUF_SIZE) < 0)
            break;

        for (buf = buf2 - 1; buf >= 0; buf--)
        {
            /* edit->buffers2[0] is already allocated */
            if (!edit->buffers2[buf])
                edit->buffers2[buf] = g_malloc0 (EDIT_BUF_SIZE);
            if (mc_read (file, (char *) edit->buffers2[buf], EDIT_BUF_SIZE) < 0)
                break;
        }
        ret = 0;
    }
    while (0);
    if (ret)
    {
        char *err_str = g_strdup_printf (_("Error reading %s"), filename);
        edit_error_dialog (_("Error"), err_str);
        g_free (err_str);
    }
    mc_close (file);
    return ret;
}

/* detecting an error on save is easy: just check if every byte has been written. */
/* detecting an error on read, is not so easy 'cos there is not way to tell
   whether you read everything or not. */
/* FIXME: add proper `triple_pipe_open' to read, write and check errors. */
static const struct edit_filters
{
    const char *read, *write, *extension;
} all_filters[] =
{
    /* *INDENT-OFF* */
    { "xz -cd %s 2>&1", "xz > %s", ".xz"},
    { "lzma -cd %s 2>&1", "lzma > %s", ".lzma" },
    { "bzip2 -cd %s 2>&1", "bzip2 > %s", ".bz2" },
    { "gzip -cd %s 2>&1", "gzip > %s", ".gz" },
    { "gzip -cd %s 2>&1", "gzip > %s", ".Z" }
    /* *INDENT-ON* */
};

/* Return index of the filter or -1 is there is no appropriate filter */
static int
edit_find_filter (const char *filename)
{
    size_t i, l, e;

    if (filename == NULL)
        return -1;

    l = strlen (filename);
    for (i = 0; i < sizeof (all_filters) / sizeof (all_filters[0]); i++)
    {
        e = strlen (all_filters[i].extension);
        if (l > e)
            if (!strcmp (all_filters[i].extension, filename + l - e))
                return i;
    }
    return -1;
}

static char *
edit_get_filter (const char *filename)
{
    int i;
    char *p, *quoted_name;

    i = edit_find_filter (filename);
    if (i < 0)
        return NULL;

    quoted_name = name_quote (filename, 0);
    p = g_strdup_printf (all_filters[i].read, quoted_name);
    g_free (quoted_name);
    return p;
}

char *
edit_get_write_filter (const char *write_name, const char *filename)
{
    int i;
    char *p, *writename;

    i = edit_find_filter (filename);
    if (i < 0)
        return NULL;

    writename = name_quote (write_name, 0);
    p = g_strdup_printf (all_filters[i].write, writename);
    g_free (writename);
    return p;
}

static long
edit_insert_stream (WEdit * edit, FILE * f)
{
    int c;
    long i = 0;
    while ((c = fgetc (f)) >= 0)
    {
        edit_insert (edit, c);
        i++;
    }
    return i;
}

long
edit_write_stream (WEdit * edit, FILE * f)
{
    long i;

    if (edit->lb == LB_ASIS)
    {
        for (i = 0; i < edit->last_byte; i++)
            if (fputc (edit_get_byte (edit, i), f) < 0)
                break;
        return i;
    }

    /* change line breaks */
    for (i = 0; i < edit->last_byte; i++)
    {
        unsigned char c = edit_get_byte (edit, i);

        if (!(c == '\n' || c == '\r'))
        {
            /* not line break */
            if (fputc (c, f) < 0)
                return i;
        }
        else
        {                       /* (c == '\n' || c == '\r') */
            unsigned char c1 = edit_get_byte (edit, i + 1);     /* next char */

            switch (edit->lb)
            {
            case LB_UNIX:      /* replace "\r\n" or '\r' to '\n' */
                /* put one line break unconditionally */
                if (fputc ('\n', f) < 0)
                    return i;

                i++;            /* 2 chars are processed */

                if (c == '\r' && c1 == '\n')
                    /* Windows line break; go to the next char */
                    break;

                if (c == '\r' && c1 == '\r')
                {
                    /* two Macintosh line breaks; put second line break */
                    if (fputc ('\n', f) < 0)
                        return i;
                    break;
                }

                if (fputc (c1, f) < 0)
                    return i;
                break;

            case LB_WIN:       /* replace '\n' or '\r' to "\r\n" */
                /* put one line break unconditionally */
                if (fputc ('\r', f) < 0 || fputc ('\n', f) < 0)
                    return i;

                if (c == '\r' && c1 == '\n')
                    /* Windows line break; go to the next char */
                    i++;
                break;

            case LB_MAC:       /* replace "\r\n" or '\n' to '\r' */
                /* put one line break unconditionally */
                if (fputc ('\r', f) < 0)
                    return i;

                i++;            /* 2 chars are processed */

                if (c == '\r' && c1 == '\n')
                    /* Windows line break; go to the next char */
                    break;

                if (c == '\n' && c1 == '\n')
                {
                    /* two Windows line breaks; put second line break */
                    if (fputc ('\r', f) < 0)
                        return i;
                    break;
                }

                if (fputc (c1, f) < 0)
                    return i;
                break;
            case LB_ASIS:      /* default without changes */
                break;
            }
        }
    }

    return edit->last_byte;
}

#define TEMP_BUF_LEN 1024

/* inserts a file at the cursor, returns 1 on success */
int
edit_insert_file (WEdit * edit, const char *filename)
{
    char *p;

    p = edit_get_filter (filename);
    if (p != NULL)
    {
        FILE *f;
        long current = edit->curs1;
        f = (FILE *) popen (p, "r");
        if (f != NULL)
        {
            edit_insert_stream (edit, f);
            edit_cursor_move (edit, current - edit->curs1);
            if (pclose (f) > 0)
            {
                char *errmsg;
                errmsg = g_strdup_printf (_("Error reading from pipe: %s"), p);
                edit_error_dialog (_("Error"), errmsg);
                g_free (errmsg);
                g_free (p);
                return 0;
            }
        }
        else
        {
            char *errmsg;
            errmsg = g_strdup_printf (_("Cannot open pipe for reading: %s"), p);
            edit_error_dialog (_("Error"), errmsg);
            g_free (errmsg);
            g_free (p);
            return 0;
        }
        g_free (p);
    }
    else
    {
        int i, file, blocklen;
        long current = edit->curs1;
        int vertical_insertion = 0;
        char *buf;
        file = mc_open (filename, O_RDONLY | O_BINARY);
        if (file == -1)
            return 0;
        buf = g_malloc0 (TEMP_BUF_LEN);
        blocklen = mc_read (file, buf, sizeof (VERTICAL_MAGIC));
        if (blocklen > 0)
        {
            /* if contain signature VERTICAL_MAGIC tnen it vertical block */
            if (memcmp (buf, VERTICAL_MAGIC, sizeof (VERTICAL_MAGIC)) == 0)
                vertical_insertion = 1;
            else
                mc_lseek (file, 0, SEEK_SET);
        }
        if (vertical_insertion)
            blocklen = edit_insert_column_of_text_from_file (edit, file);
        else
            while ((blocklen = mc_read (file, (char *) buf, TEMP_BUF_LEN)) > 0)
                for (i = 0; i < blocklen; i++)
                    edit_insert (edit, buf[i]);
        edit_cursor_move (edit, current - edit->curs1);
        g_free (buf);
        mc_close (file);
        if (blocklen != 0)
            return 0;
    }
    return 1;
}

/* Open file and create it if necessary.  Return 0 for success, 1 for error.  */
static int
check_file_access (WEdit * edit, const char *filename, struct stat *st)
{
    int file;
    gchar *errmsg = NULL;

    /* Try opening an existing file */
    file = mc_open (filename, O_NONBLOCK | O_RDONLY | O_BINARY, 0666);

    if (file < 0)
    {
        /*
         * Try creating the file. O_EXCL prevents following broken links
         * and opening existing files.
         */
        file = mc_open (filename, O_NONBLOCK | O_RDONLY | O_BINARY | O_CREAT | O_EXCL, 0666);
        if (file < 0)
        {
            errmsg = g_strdup_printf (_("Cannot open %s for reading"), filename);
            goto cleanup;
        }
        else
        {
            /* New file, delete it if it's not modified or saved */
            edit->delete_file = 1;
        }
    }

    /* Check what we have opened */
    if (mc_fstat (file, st) < 0)
    {
        errmsg = g_strdup_printf (_("Cannot get size/permissions for %s"), filename);
        goto cleanup;
    }

    /* We want to open regular files only */
    if (!S_ISREG (st->st_mode))
    {
        errmsg = g_strdup_printf (_("\"%s\" is not a regular file"), filename);
        goto cleanup;
    }

    /*
     * Don't delete non-empty files.
     * O_EXCL should prevent it, but let's be on the safe side.
     */
    if (st->st_size > 0)
        edit->delete_file = 0;

    if (st->st_size >= SIZE_LIMIT)
        errmsg = g_strdup_printf (_("File \"%s\" is too large"), filename);

  cleanup:
    (void) mc_close (file);

    if (errmsg != NULL)
    {
        edit_error_dialog (_("Error"), errmsg);
        g_free (errmsg);
        return 1;
    }
    return 0;
}

/*
 * Open the file and load it into the buffers, either directly or using
 * a filter.  Return 0 on success, 1 on error.
 *
 * Fast loading (edit_load_file_fast) is used when the file size is
 * known.  In this case the data is read into the buffers by blocks.
 * If the file size is not known, the data is loaded byte by byte in
 * edit_insert_file.
 */
static int
edit_load_file (WEdit * edit)
{
    int fast_load = 1;

    /* Cannot do fast load if a filter is used */
    if (edit_find_filter (edit->filename) >= 0)
        fast_load = 0;

    /*
     * VFS may report file size incorrectly, and slow load is not a big
     * deal considering overhead in VFS.
     */
    if (!vfs_file_is_local (edit->filename))
        fast_load = 0;

    /*
     * FIXME: line end translation should disable fast loading as well
     * Consider doing fseek() to the end and ftell() for the real size.
     */

    if (*edit->filename)
    {
        /* If we are dealing with a real file, check that it exists */
        if (check_file_access (edit, edit->filename, &edit->stat1))
            return 1;
    }
    else
    {
        /* nothing to load */
        fast_load = 0;
    }

    edit_init_buffers (edit);

    if (fast_load)
    {
        edit->last_byte = edit->stat1.st_size;
        edit_load_file_fast (edit, edit->filename);
        /* If fast load was used, the number of lines wasn't calculated */
        edit->total_lines = edit_count_lines (edit, 0, edit->last_byte);
    }
    else
    {
        edit->last_byte = 0;
        if (*edit->filename)
        {
            edit->stack_disable = 1;
            if (!edit_insert_file (edit, edit->filename))
            {
                edit_clean (edit);
                return 1;
            }
            edit->stack_disable = 0;
        }
    }
    edit->lb = LB_ASIS;
    return 0;
}

/* Restore saved cursor position in the file */
static void
edit_load_position (WEdit * edit)
{
    char *filename;
    long line, column;
    off_t offset;

    if (!edit->filename || !*edit->filename)
        return;

    filename = vfs_canon (edit->filename);
    load_file_position (filename, &line, &column, &offset);
    g_free (filename);

    if (line > 0)
    {
        edit_move_to_line (edit, line - 1);
        edit->prev_col = column;
    }
    else if (offset > 0)
    {
        edit_cursor_move (edit, offset);
        line = edit->curs_line;
    }
    edit_move_to_prev_col (edit, edit_bol (edit, edit->curs1));
    edit_move_display (edit, line - (edit->num_widget_lines / 2));
}

/* Save cursor position in the file */
static void
edit_save_position (WEdit * edit)
{
    char *filename;

    if (!edit->filename || !*edit->filename)
        return;

    filename = vfs_canon (edit->filename);
    save_file_position (filename, edit->curs_line + 1, edit->curs_col, edit->curs1);
    g_free (filename);
}

/* Clean the WEdit stricture except the widget part */
static void
edit_purge_widget (WEdit * edit)
{
    size_t len = sizeof (WEdit) - sizeof (Widget);
    char *start = (char *) edit + sizeof (Widget);
    memset (start, 0, len);
    edit->macro_i = -1;         /* not recording a macro */
}

static void
edit_set_keymap (void)
{
    editor_map = default_editor_keymap;
    if (editor_keymap && editor_keymap->len > 0)
        editor_map = (global_keymap_t *) editor_keymap->data;

    editor_x_map = default_editor_x_keymap;
    if (editor_x_keymap && editor_x_keymap->len > 0)
        editor_x_map = (global_keymap_t *) editor_x_keymap->data;
}


#define space_width 1

/*
 * Fill in the edit structure.  Return NULL on failure.  Pass edit as
 * NULL to allocate a new structure.
 *
 * If line is 0, try to restore saved position.  Otherwise put the
 * cursor on that line and show it in the middle of the screen.
 */
WEdit *
edit_init (WEdit * edit, int lines, int columns, const char *filename, long line)
{
    int to_free = 0;
    option_auto_syntax = 1;     /* Resetting to auto on every invokation */
    if (option_line_state)
    {
        option_line_state_width = LINE_STATE_WIDTH;
    }
    else
    {
        option_line_state_width = 0;
    }
    if (!edit)
    {
#ifdef ENABLE_NLS
        /*
         * Expand option_whole_chars_search by national letters using
         * current locale
         */

        static char option_whole_chars_search_buf[256];

        if (option_whole_chars_search_buf != option_whole_chars_search)
        {
            size_t i;
            size_t len = str_term_width1 (option_whole_chars_search);

            strcpy (option_whole_chars_search_buf, option_whole_chars_search);

            for (i = 1; i <= sizeof (option_whole_chars_search_buf); i++)
            {
                if (g_ascii_islower ((gchar) i) && !strchr (option_whole_chars_search, i))
                {
                    option_whole_chars_search_buf[len++] = i;
                }
            }

            option_whole_chars_search_buf[len] = 0;
            option_whole_chars_search = option_whole_chars_search_buf;
        }
#endif /* ENABLE_NLS */
        edit = g_malloc0 (sizeof (WEdit));
        edit->search = NULL;
        to_free = 1;
    }
    edit_purge_widget (edit);
    edit->num_widget_lines = lines;
    edit->over_col = 0;
    edit->num_widget_columns = columns;
    edit->stat1.st_mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
    edit->stat1.st_uid = getuid ();
    edit->stat1.st_gid = getgid ();
    edit->stat1.st_mtime = 0;
    edit->bracket = -1;
    edit->force |= REDRAW_PAGE;
    edit_set_filename (edit, filename);
    edit->stack_size = START_STACK_SIZE;
    edit->stack_size_mask = START_STACK_SIZE - 1;
    edit->undo_stack = g_malloc0 ((edit->stack_size + 10) * sizeof (long));

    edit->utf8 = 0;
    edit->converter = str_cnv_from_term;
    edit_set_codeset (edit);

    if (edit_load_file (edit))
    {
        /* edit_load_file already gives an error message */
        if (to_free)
            g_free (edit);
        return 0;
    }

    edit->loading_done = 1;
    edit->modified = 0;
    edit->locked = 0;
    edit_load_syntax (edit, NULL, NULL);
    {
        int color;
        edit_get_syntax_color (edit, -1, &color);
    }

    /* load saved cursor position */
    if ((line == 0) && option_save_position)
    {
        edit_load_position (edit);
    }
    else
    {
        if (line <= 0)
            line = 1;
        edit_move_display (edit, line - 1);
        edit_move_to_line (edit, line - 1);
    }

    edit_set_keymap ();

    return edit;
}

/* Clear the edit struct, freeing everything in it.  Return 1 on success */
int
edit_clean (WEdit * edit)
{
    int j = 0;

    if (!edit)
        return 0;

    /* a stale lock, remove it */
    if (edit->locked)
        edit->locked = edit_unlock_file (edit);

    /* save cursor position */
    if (option_save_position)
        edit_save_position (edit);

    /* File specified on the mcedit command line and never saved */
    if (edit->delete_file)
        unlink (edit->filename);

    edit_free_syntax_rules (edit);
    book_mark_flush (edit, -1);
    for (; j <= MAXBUFF; j++)
    {
        g_free (edit->buffers1[j]);
        g_free (edit->buffers2[j]);
    }

    g_free (edit->undo_stack);
    g_free (edit->filename);
    g_free (edit->dir);

    mc_search_free (edit->search);
    edit->search = NULL;

    if (edit->converter != str_cnv_from_term)
        str_close_conv (edit->converter);

    edit_purge_widget (edit);

    return 1;
}

/* returns 1 on success */
int
edit_renew (WEdit * edit)
{
    int lines = edit->num_widget_lines;
    int columns = edit->num_widget_columns;

    edit_clean (edit);
    return (edit_init (edit, lines, columns, "", 0) != NULL);
}

/*
 * Load a new file into the editor.  If it fails, preserve the old file.
 * To do it, allocate a new widget, initialize it and, if the new file
 * was loaded, copy the data to the old widget.
 * Return 1 on success, 0 on failure.
 */
int
edit_reload (WEdit * edit, const char *filename)
{
    WEdit *e;
    int lines = edit->num_widget_lines;
    int columns = edit->num_widget_columns;

    e = g_malloc0 (sizeof (WEdit));
    e->widget = edit->widget;
    if (!edit_init (e, lines, columns, filename, 0))
    {
        g_free (e);
        return 0;
    }
    edit_clean (edit);
    memcpy (edit, e, sizeof (WEdit));
    g_free (e);
    return 1;
}

/*
 * Load a new file into the editor and set line.  If it fails, preserve the old file.
 * To do it, allocate a new widget, initialize it and, if the new file
 * was loaded, copy the data to the old widget.
 * Return 1 on success, 0 on failure.
 */
int
edit_reload_line (WEdit * edit, const char *filename, long line)
{
    WEdit *e;
    int lines = edit->num_widget_lines;
    int columns = edit->num_widget_columns;

    e = g_malloc0 (sizeof (WEdit));
    e->widget = edit->widget;
    if (!edit_init (e, lines, columns, filename, line))
    {
        g_free (e);
        return 0;
    }
    edit_clean (edit);
    memcpy (edit, e, sizeof (WEdit));
    g_free (e);
    return 1;
}

void
edit_set_codeset (WEdit *edit)
{
#ifdef HAVE_CHARSET
    const char *cp_id;

    cp_id = get_codepage_id (source_codepage >= 0 ? source_codepage : display_codepage);

    if (cp_id != NULL)
    {
        GIConv conv;
        conv = str_crt_conv_from (cp_id);
        if (conv != INVALID_CONV)
        {
            if (edit->converter != str_cnv_from_term)
                str_close_conv (edit->converter);
            edit->converter = conv;
        }
    }

    if (cp_id != NULL)
        edit->utf8 = str_isutf8 (cp_id);
#else
    (void) edit;
#endif
}


/*
   Recording stack for undo:
   The following is an implementation of a compressed stack. Identical
   pushes are recorded by a negative prefix indicating the number of times the
   same char was pushed. This saves space for repeated curs-left or curs-right
   delete etc.

   eg:

   pushed:       stored:

   a
   b             a
   b            -3
   b             b
   c  -->       -4
   c             c
   c             d
   c
   d

   If the stack long int is 0-255 it represents a normal insert (from a backspace),
   256-512 is an insert ahead (from a delete), If it is betwen 600 and 700 it is one
   of the cursor functions #define'd in edit-impl.h. 1000 through 700'000'000 is to
   set edit->mark1 position. 700'000'000 through 1400'000'000 is to set edit->mark2
   position.

   The only way the cursor moves or the buffer is changed is through the routines:
   insert, backspace, insert_ahead, delete, and cursor_move.
   These record the reverse undo movements onto the stack each time they are
   called.

   Each key press results in a set of actions (insert; delete ...). So each time
   a key is pressed the current position of start_display is pushed as
   KEY_PRESS + start_display. Then for undoing, we pop until we get to a number
   over KEY_PRESS. We then assign this number less KEY_PRESS to start_display. So undo
   tracks scrolling and key actions exactly. (KEY_PRESS is about (2^31) * (2/3) = 1400'000'000)

 */

void
edit_push_action (WEdit * edit, long c, ...)
{
    unsigned long sp = edit->stack_pointer;
    unsigned long spm1;
    long *t;

    /* first enlarge the stack if necessary */
    if (sp > edit->stack_size - 10)
    {                           /* say */
        if (option_max_undo < 256)
            option_max_undo = 256;
        if (edit->stack_size < (unsigned long) option_max_undo)
        {
            t = g_realloc (edit->undo_stack, (edit->stack_size * 2 + 10) * sizeof (long));
            if (t)
            {
                edit->undo_stack = t;
                edit->stack_size <<= 1;
                edit->stack_size_mask = edit->stack_size - 1;
            }
        }
    }
    spm1 = (edit->stack_pointer - 1) & edit->stack_size_mask;
    if (edit->stack_disable)
        return;

#ifdef FAST_MOVE_CURSOR
    if (c == CURS_LEFT_LOTS || c == CURS_RIGHT_LOTS)
    {
        va_list ap;
        edit->undo_stack[sp] = (c == CURS_LEFT_LOTS) ? CURS_LEFT : CURS_RIGHT;
        edit->stack_pointer = (edit->stack_pointer + 1) & edit->stack_size_mask;
        va_start (ap, c);
        c = -(va_arg (ap, int));
        va_end (ap);
    }
    else
#endif /* ! FAST_MOVE_CURSOR */
    if (edit->stack_bottom != sp
            && spm1 != edit->stack_bottom
            && ((sp - 2) & edit->stack_size_mask) != edit->stack_bottom)
    {
        int d;
        if (edit->undo_stack[spm1] < 0)
        {
            d = edit->undo_stack[(sp - 2) & edit->stack_size_mask];
            if (d == c)
            {
                if (edit->undo_stack[spm1] > -1000000000)
                {
                    if (c < KEY_PRESS)  /* --> no need to push multiple do-nothings */
                        edit->undo_stack[spm1]--;
                    return;
                }
            }
            /* #define NO_STACK_CURSMOVE_ANIHILATION */
#ifndef NO_STACK_CURSMOVE_ANIHILATION
            else if ((c == CURS_LEFT && d == CURS_RIGHT) || (c == CURS_RIGHT && d == CURS_LEFT))
            {                   /* a left then a right anihilate each other */
                if (edit->undo_stack[spm1] == -2)
                    edit->stack_pointer = spm1;
                else
                    edit->undo_stack[spm1]++;
                return;
            }
#endif
        }
        else
        {
            d = edit->undo_stack[spm1];
            if (d == c)
            {
                if (c >= KEY_PRESS)
                    return;     /* --> no need to push multiple do-nothings */
                edit->undo_stack[sp] = -2;
                goto check_bottom;
            }
#ifndef NO_STACK_CURSMOVE_ANIHILATION
            else if ((c == CURS_LEFT && d == CURS_RIGHT) || (c == CURS_RIGHT && d == CURS_LEFT))
            {                   /* a left then a right anihilate each other */
                edit->stack_pointer = spm1;
                return;
            }
#endif
        }
    }
    edit->undo_stack[sp] = c;

  check_bottom:
    edit->stack_pointer = (edit->stack_pointer + 1) & edit->stack_size_mask;

    /* if the sp wraps round and catches the stack_bottom then erase
     * the first set of actions on the stack to make space - by moving
     * stack_bottom forward one "key press" */
    c = (edit->stack_pointer + 2) & edit->stack_size_mask;
    if ((unsigned long) c == edit->stack_bottom ||
        (((unsigned long) c + 1) & edit->stack_size_mask) == edit->stack_bottom)
        do
        {
            edit->stack_bottom = (edit->stack_bottom + 1) & edit->stack_size_mask;
        }
        while (edit->undo_stack[edit->stack_bottom] < KEY_PRESS
               && edit->stack_bottom != edit->stack_pointer);

    /*If a single key produced enough pushes to wrap all the way round then we would notice that the [stack_bottom] does not contain KEY_PRESS. The stack is then initialised: */
    if (edit->stack_pointer != edit->stack_bottom
        && edit->undo_stack[edit->stack_bottom] < KEY_PRESS)
        edit->stack_bottom = edit->stack_pointer = 0;
}

/*
   TODO: if the user undos until the stack bottom, and the stack has not wrapped,
   then the file should be as it was when he loaded up. Then set edit->modified to 0.
 */
static long
pop_action (WEdit * edit)
{
    long c;
    unsigned long sp = edit->stack_pointer;

    if (sp == edit->stack_bottom)
        return STACK_BOTTOM;

    sp = (sp - 1) & edit->stack_size_mask;
    c = edit->undo_stack[sp];
    if (c >= 0)
    {
        /*      edit->undo_stack[sp] = '@'; */
        edit->stack_pointer = (edit->stack_pointer - 1) & edit->stack_size_mask;
        return c;
    }

    if (sp == edit->stack_bottom)
        return STACK_BOTTOM;

    c = edit->undo_stack[(sp - 1) & edit->stack_size_mask];
    if (edit->undo_stack[sp] == -2)
    {
        /*      edit->undo_stack[sp] = '@'; */
        edit->stack_pointer = sp;
    }
    else
        edit->undo_stack[sp]++;

    return c;
}

/* is called whenever a modification is made by one of the four routines below */
static void
edit_modification (WEdit * edit)
{
    edit->caches_valid = 0;
    edit->screen_modified = 1;

    /* raise lock when file modified */
    if (!edit->modified && !edit->delete_file)
        edit->locked = edit_lock_file (edit);
    edit->modified = 1;
}

/*
   Basic low level single character buffer alterations and movements at the cursor.
   Returns char passed over, inserted or removed.
 */

void
edit_insert (WEdit * edit, int c)
{
    /* check if file has grown to large */
    if (edit->last_byte >= SIZE_LIMIT)
        return;

    /* first we must update the position of the display window */
    if (edit->curs1 < edit->start_display)
    {
        edit->start_display++;
        if (c == '\n')
            edit->start_line++;
    }

    /* Mark file as modified, unless the file hasn't been fully loaded */
    if (edit->loading_done)
    {
        edit_modification (edit);
    }

    /* now we must update some info on the file and check if a redraw is required */
    if (c == '\n')
    {
        if (edit->book_mark)
            book_mark_inc (edit, edit->curs_line);
        edit->curs_line++;
        edit->total_lines++;
        edit->force |= REDRAW_LINE_ABOVE | REDRAW_AFTER_CURSOR;
    }

    /* save the reverse command onto the undo stack */
    edit_push_action (edit, BACKSPACE);

    /* update markers */
    edit->mark1 += (edit->mark1 > edit->curs1);
    edit->mark2 += (edit->mark2 > edit->curs1);
    edit->last_get_rule += (edit->last_get_rule > edit->curs1);

    /* add a new buffer if we've reached the end of the last one */
    if (!(edit->curs1 & M_EDIT_BUF_SIZE))
        edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);

    /* perform the insertion */
    edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE]
        = (unsigned char) c;

    /* update file length */
    edit->last_byte++;

    /* update cursor position */
    edit->curs1++;
}

static void
edit_insert_over (WEdit * edit)
{
    int i;

    for (i = 0; i < edit->over_col; i++)
    {
        edit_insert (edit, ' ');
    }
    edit->over_col = 0;
}

/* same as edit_insert and move left */
void
edit_insert_ahead (WEdit * edit, int c)
{
    if (edit->last_byte >= SIZE_LIMIT)
        return;

    if (edit->curs1 < edit->start_display)
    {
        edit->start_display++;
        if (c == '\n')
            edit->start_line++;
    }
    edit_modification (edit);
    if (c == '\n')
    {
        if (edit->book_mark)
            book_mark_inc (edit, edit->curs_line);
        edit->total_lines++;
        edit->force |= REDRAW_AFTER_CURSOR;
    }
    edit_push_action (edit, DELCHAR);

    edit->mark1 += (edit->mark1 >= edit->curs1);
    edit->mark2 += (edit->mark2 >= edit->curs1);
    edit->last_get_rule += (edit->last_get_rule >= edit->curs1);

    if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
        edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
    edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]
                  [EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;

    edit->last_byte++;
    edit->curs2++;
}


int
edit_delete (WEdit * edit, const int byte_delete)
{
    int p = 0;
    int cw = 1;
    int i;

    if (!edit->curs2)
        return 0;

    cw = 1;
    /* if byte_delete = 1 then delete only one byte not multibyte char */
    if (edit->utf8 && byte_delete == 0)
    {
        edit_get_utf (edit, edit->curs1, &cw);
        if (cw < 1)
            cw = 1;
    }
    for (i = 1; i <= cw; i++)
    {
        if (edit->mark1 > edit->curs1)
            edit->mark1--;
        if (edit->mark2 > edit->curs1)
            edit->mark2--;
        if (edit->last_get_rule > edit->curs1)
            edit->last_get_rule--;

        p = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
                                                                 ((edit->curs2 -
                                                                   1) & M_EDIT_BUF_SIZE) - 1];

        if (!(edit->curs2 & M_EDIT_BUF_SIZE))
        {
            g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
            edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = NULL;
        }
        edit->last_byte--;
        edit->curs2--;
        edit_push_action (edit, p + 256);
    }

    edit_modification (edit);
    if (p == '\n')
    {
        if (edit->book_mark)
            book_mark_dec (edit, edit->curs_line);
        edit->total_lines--;
        edit->force |= REDRAW_AFTER_CURSOR;
    }
    if (edit->curs1 < edit->start_display)
    {
        edit->start_display--;
        if (p == '\n')
            edit->start_line--;
    }

    return p;
}


static int
edit_backspace (WEdit * edit, const int byte_delete)
{
    int p = 0;
    int cw = 1;
    int i;

    if (!edit->curs1)
        return 0;

    cw = 1;

    if (edit->utf8 && byte_delete == 0)
    {
        edit_get_prev_utf (edit, edit->curs1, &cw);
        if (cw < 1)
            cw = 1;
    }
    for (i = 1; i <= cw; i++)
    {
        if (edit->mark1 >= edit->curs1)
            edit->mark1--;
        if (edit->mark1 >= edit->curs1)
            edit->mark2--;
        if (edit->last_get_rule >= edit->curs1)
            edit->last_get_rule--;

        p = *(edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE] +
              ((edit->curs1 - 1) & M_EDIT_BUF_SIZE));
        if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE))
        {
            g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
            edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
        }
        edit->last_byte--;
        edit->curs1--;
        edit_push_action (edit, p);
    }
    edit_modification (edit);
    if (p == '\n')
    {
        if (edit->book_mark)
            book_mark_dec (edit, edit->curs_line);
        edit->curs_line--;
        edit->total_lines--;
        edit->force |= REDRAW_AFTER_CURSOR;
    }

    if (edit->curs1 < edit->start_display)
    {
        edit->start_display--;
        if (p == '\n')
            edit->start_line--;
    }

    return p;
}

#ifdef FAST_MOVE_CURSOR

static void
memqcpy (WEdit * edit, unsigned char *dest, unsigned char *src, int n)
{
    unsigned long next;
    while ((next = (unsigned long) memccpy (dest, src, '\n', n)))
    {
        edit->curs_line--;
        next -= (unsigned long) dest;
        n -= next;
        src += next;
        dest += next;
    }
}

int
edit_move_backward_lots (WEdit * edit, long increment)
{
    int r, s, t;
    unsigned char *p = NULL;

    if (increment > edit->curs1)
        increment = edit->curs1;
    if (increment <= 0)
        return -1;
    edit_push_action (edit, CURS_RIGHT_LOTS, increment);

    t = r = EDIT_BUF_SIZE - (edit->curs2 & M_EDIT_BUF_SIZE);
    if (r > increment)
        r = increment;
    s = edit->curs1 & M_EDIT_BUF_SIZE;

    if (s > r)
    {
        memqcpy (edit,
                 edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t - r,
                 edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] + s - r, r);
    }
    else
    {
        if (s != 0)
        {
            memqcpy (edit,
                     edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t -
                     s, edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE], s);
            p = edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE];
            edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = 0;
        }
        memqcpy (edit,
                 edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] + t - r,
                 edit->buffers1[(edit->curs1 >> S_EDIT_BUF_SIZE) - 1] +
                 EDIT_BUF_SIZE - (r - s), r - s);
    }
    increment -= r;
    edit->curs1 -= r;
    edit->curs2 += r;
    if (!(edit->curs2 & M_EDIT_BUF_SIZE))
    {
        if (p)
            edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = p;
        else
            edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
    }
    else
    {
        g_free (p);
    }

    s = edit->curs1 & M_EDIT_BUF_SIZE;
    while (increment)
    {
        p = 0;
        r = EDIT_BUF_SIZE;
        if (r > increment)
            r = increment;
        t = s;
        if (r < t)
            t = r;
        memqcpy (edit,
                 edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] +
                 EDIT_BUF_SIZE - t, edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] + s - t, t);
        if (r >= s)
        {
            if (t)
            {
                p = edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE];
                edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = 0;
            }
            memqcpy (edit,
                     edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] +
                     EDIT_BUF_SIZE - r,
                     edit->buffers1[(edit->curs1 >> S_EDIT_BUF_SIZE) - 1] +
                     EDIT_BUF_SIZE - (r - s), r - s);
        }
        increment -= r;
        edit->curs1 -= r;
        edit->curs2 += r;
        if (!(edit->curs2 & M_EDIT_BUF_SIZE))
        {
            if (p)
                edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = p;
            else
                edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
        }
        else
            g_free (p);
    }
    return edit_get_byte (edit, edit->curs1);
}

#endif /* ! FAST_MOVE_CURSOR */

/* moves the cursor right or left: increment positive or negative respectively */
void
edit_cursor_move (WEdit * edit, long increment)
{
    /* this is the same as a combination of two of the above routines, with only one push onto the undo stack */
    int c;
#ifdef FAST_MOVE_CURSOR
    if (increment < -256)
    {
        edit->force |= REDRAW_PAGE;
        edit_move_backward_lots (edit, -increment);
        return;
    }
#endif /* ! FAST_MOVE_CURSOR */

    if (increment < 0)
    {
        for (; increment < 0; increment++)
        {
            if (!edit->curs1)
                return;

            edit_push_action (edit, CURS_RIGHT);

            c = edit_get_byte (edit, edit->curs1 - 1);
            if (!((edit->curs2 + 1) & M_EDIT_BUF_SIZE))
                edit->buffers2[(edit->curs2 + 1) >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
            edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
                                                           (edit->curs2 & M_EDIT_BUF_SIZE) - 1] = c;
            edit->curs2++;
            c = edit->buffers1[(edit->curs1 - 1) >> S_EDIT_BUF_SIZE][(edit->curs1 -
                                                                      1) & M_EDIT_BUF_SIZE];
            if (!((edit->curs1 - 1) & M_EDIT_BUF_SIZE))
            {
                g_free (edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE]);
                edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = NULL;
            }
            edit->curs1--;
            if (c == '\n')
            {
                edit->curs_line--;
                edit->force |= REDRAW_LINE_BELOW;
            }
        }

    }
    else if (increment > 0)
    {
        for (; increment > 0; increment--)
        {
            if (!edit->curs2)
                return;

            edit_push_action (edit, CURS_LEFT);

            c = edit_get_byte (edit, edit->curs1);
            if (!(edit->curs1 & M_EDIT_BUF_SIZE))
                edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE] = g_malloc0 (EDIT_BUF_SIZE);
            edit->buffers1[edit->curs1 >> S_EDIT_BUF_SIZE][edit->curs1 & M_EDIT_BUF_SIZE] = c;
            edit->curs1++;
            c = edit->buffers2[(edit->curs2 - 1) >> S_EDIT_BUF_SIZE][EDIT_BUF_SIZE -
                                                                     ((edit->curs2 -
                                                                       1) & M_EDIT_BUF_SIZE) - 1];
            if (!(edit->curs2 & M_EDIT_BUF_SIZE))
            {
                g_free (edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE]);
                edit->buffers2[edit->curs2 >> S_EDIT_BUF_SIZE] = 0;
            }
            edit->curs2--;
            if (c == '\n')
            {
                edit->curs_line++;
                edit->force |= REDRAW_LINE_ABOVE;
            }
        }
    }
}

/* These functions return positions relative to lines */

/* returns index of last char on line + 1 */
long
edit_eol (WEdit * edit, long current)
{
    if (current >= edit->last_byte)
        return edit->last_byte;

    for (;; current++)
        if (edit_get_byte (edit, current) == '\n')
            break;
    return current;
}

/* returns index of first char on line */
long
edit_bol (WEdit * edit, long current)
{
    if (current <= 0)
        return 0;

    for (;; current--)
        if (edit_get_byte (edit, current - 1) == '\n')
            break;
    return current;
}


long
edit_count_lines (WEdit * edit, long current, long upto)
{
    long lines = 0;
    if (upto > edit->last_byte)
        upto = edit->last_byte;
    if (current < 0)
        current = 0;
    while (current < upto)
        if (edit_get_byte (edit, current++) == '\n')
            lines++;
    return lines;
}


/* If lines is zero this returns the count of lines from current to upto. */
/* If upto is zero returns index of lines forward current. */
long
edit_move_forward (WEdit * edit, long current, long lines, long upto)
{
    if (upto)
    {
        return edit_count_lines (edit, current, upto);
    }
    else
    {
        long next;
        if (lines < 0)
            lines = 0;
        while (lines--)
        {
            next = edit_eol (edit, current) + 1;
            if (next > edit->last_byte)
                break;
            else
                current = next;
        }
        return current;
    }
}


/* Returns offset of 'lines' lines up from current */
long
edit_move_backward (WEdit * edit, long current, long lines)
{
    if (lines < 0)
        lines = 0;
    current = edit_bol (edit, current);
    while ((lines--) && current != 0)
        current = edit_bol (edit, current - 1);
    return current;
}

/* If cols is zero this returns the count of columns from current to upto. */
/* If upto is zero returns index of cols across from current. */
long
edit_move_forward3 (WEdit * edit, long current, int cols, long upto)
{
    long p, q;
    int col;

    if (upto)
    {
        q = upto;
        cols = -10;
    }
    else
        q = edit->last_byte + 2;

    for (col = 0, p = current; p < q; p++)
    {
        int c, orig_c;
        int utf_ch = 0;
#ifdef HAVE_CHARSET
        int cw = 1;
#endif
        if (cols != -10)
        {
            if (col == cols)
                return p;
            if (col > cols)
                return p - 1;
        }
        orig_c = c = edit_get_byte (edit, p);
#ifdef HAVE_CHARSET
        if (edit->utf8)
        {
            utf_ch = edit_get_utf (edit, p, &cw);
            if (utf8_display)
            {
                if (cw > 1)
                    col -= cw - 1;
                if (g_unichar_iswide (utf_ch))
                    col++;
            }
            else if (cw > 1 && g_unichar_isprint (utf_ch))
                col -= cw - 1;
        }
#endif
        c = convert_to_display_c (c);
        if (c == '\t')
            col += TAB_SIZE - col % TAB_SIZE;
        else if (c == '\n')
        {
            if (upto)
                return col;
            else
                return p;
        }
        else if ((c < 32 || c == 127) && (orig_c == c || (!utf8_display && !edit->utf8)))
            /* '\r' is shown as ^M, so we must advance 2 characters */
            /* Caret notation for control characters */
            col += 2;
        else
            col++;
    }
    return col;
}

/* returns the current column position of the cursor */
int
edit_get_col (WEdit * edit)
{
    return edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
}


/* Scrolling functions */

void
edit_update_curs_row (WEdit * edit)
{
    edit->curs_row = edit->curs_line - edit->start_line;
}

void
edit_update_curs_col (WEdit * edit)
{
    edit->curs_col = edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0, edit->curs1);
}

int
edit_get_curs_col (const WEdit * edit)
{
    return edit->curs_col;
}

/*moves the display start position up by i lines */
void
edit_scroll_upward (WEdit * edit, unsigned long i)
{
    unsigned long lines_above = edit->start_line;
    if (i > lines_above)
        i = lines_above;
    if (i)
    {
        edit->start_line -= i;
        edit->start_display = edit_move_backward (edit, edit->start_display, i);
        edit->force |= REDRAW_PAGE;
        edit->force &= (0xfff - REDRAW_CHAR_ONLY);
    }
    edit_update_curs_row (edit);
}


/* returns 1 if could scroll, 0 otherwise */
void
edit_scroll_downward (WEdit * edit, int i)
{
    int lines_below;
    lines_below = edit->total_lines - edit->start_line - (edit->num_widget_lines - 1);
    if (lines_below > 0)
    {
        if (i > lines_below)
            i = lines_below;
        edit->start_line += i;
        edit->start_display = edit_move_forward (edit, edit->start_display, i, 0);
        edit->force |= REDRAW_PAGE;
        edit->force &= (0xfff - REDRAW_CHAR_ONLY);
    }
    edit_update_curs_row (edit);
}

void
edit_scroll_right (WEdit * edit, int i)
{
    edit->force |= REDRAW_PAGE;
    edit->force &= (0xfff - REDRAW_CHAR_ONLY);
    edit->start_col -= i;
}

void
edit_scroll_left (WEdit * edit, int i)
{
    if (edit->start_col)
    {
        edit->start_col += i;
        if (edit->start_col > 0)
            edit->start_col = 0;
        edit->force |= REDRAW_PAGE;
        edit->force &= (0xfff - REDRAW_CHAR_ONLY);
    }
}

/* high level cursor movement commands */

static int
is_in_indent (WEdit * edit)
{
    long p = edit_bol (edit, edit->curs1);
    while (p < edit->curs1)
        if (!strchr (" \t", edit_get_byte (edit, p++)))
            return 0;
    return 1;
}

static int left_of_four_spaces (WEdit * edit);

void
edit_move_to_prev_col (WEdit * edit, long p)
{
    int prev = edit->prev_col;
    int over = edit->over_col;
    edit_cursor_move (edit, edit_move_forward3 (edit, p, prev + edit->over_col, 0) - edit->curs1);

    if (option_cursor_beyond_eol)
    {
        long line_len = edit_move_forward3 (edit, edit_bol (edit, edit->curs1), 0,
                                            edit_eol (edit, edit->curs1));

        if (line_len < prev + edit->over_col)
        {
            edit->over_col = prev + over - line_len;
            edit->prev_col = line_len;
            edit->curs_col = line_len;
        }
        else
        {
            edit->curs_col = prev + over;
            edit->prev_col = edit->curs_col;
            edit->over_col = 0;
        }
    }
    else
    {
        edit->over_col = 0;
        if (is_in_indent (edit) && option_fake_half_tabs)
        {
            edit_update_curs_col (edit);
            if (space_width)
                if (edit->curs_col % (HALF_TAB_SIZE * space_width))
                {
                    int q = edit->curs_col;
                    edit->curs_col -= (edit->curs_col % (HALF_TAB_SIZE * space_width));
                    p = edit_bol (edit, edit->curs1);
                    edit_cursor_move (edit,
                                      edit_move_forward3 (edit, p, edit->curs_col,
                                                          0) - edit->curs1);
                    if (!left_of_four_spaces (edit))
                        edit_cursor_move (edit, edit_move_forward3 (edit, p, q, 0) - edit->curs1);
                }
        }
    }
}

static int
is_blank (WEdit * edit, long offset)
{
    long s, f;
    int c;
    s = edit_bol (edit, offset);
    f = edit_eol (edit, offset) - 1;
    while (s <= f)
    {
        c = edit_get_byte (edit, s++);
        if (!isspace (c))
            return 0;
    }
    return 1;
}


/* returns the offset of line i */
static long
edit_find_line (WEdit * edit, int line)
{
    int i, j = 0;
    int m = 2000000000;
    if (!edit->caches_valid)
    {
        for (i = 0; i < N_LINE_CACHES; i++)
            edit->line_numbers[i] = edit->line_offsets[i] = 0;
        /* three offsets that we *know* are line 0 at 0 and these two: */
        edit->line_numbers[1] = edit->curs_line;
        edit->line_offsets[1] = edit_bol (edit, edit->curs1);
        edit->line_numbers[2] = edit->total_lines;
        edit->line_offsets[2] = edit_bol (edit, edit->last_byte);
        edit->caches_valid = 1;
    }
    if (line >= edit->total_lines)
        return edit->line_offsets[2];
    if (line <= 0)
        return 0;
    /* find the closest known point */
    for (i = 0; i < N_LINE_CACHES; i++)
    {
        int n;
        n = abs (edit->line_numbers[i] - line);
        if (n < m)
        {
            m = n;
            j = i;
        }
    }
    if (m == 0)
        return edit->line_offsets[j];   /* know the offset exactly */
    if (m == 1 && j >= 3)
        i = j;                  /* one line different - caller might be looping, so stay in this cache */
    else
        i = 3 + (rand () % (N_LINE_CACHES - 3));
    if (line > edit->line_numbers[j])
        edit->line_offsets[i] =
            edit_move_forward (edit, edit->line_offsets[j], line - edit->line_numbers[j], 0);
    else
        edit->line_offsets[i] =
            edit_move_backward (edit, edit->line_offsets[j], edit->line_numbers[j] - line);
    edit->line_numbers[i] = line;
    return edit->line_offsets[i];
}

int
line_is_blank (WEdit * edit, long line)
{
    return is_blank (edit, edit_find_line (edit, line));
}

/* moves up until a blank line is reached, or until just
   before a non-blank line is reached */
static void
edit_move_up_paragraph (WEdit * edit, int do_scroll)
{
    int i = 0;
    if (edit->curs_line > 1)
    {
        if (line_is_blank (edit, edit->curs_line))
        {
            if (line_is_blank (edit, edit->curs_line - 1))
            {
                for (i = edit->curs_line - 1; i; i--)
                    if (!line_is_blank (edit, i))
                    {
                        i++;
                        break;
                    }
            }
            else
            {
                for (i = edit->curs_line - 1; i; i--)
                    if (line_is_blank (edit, i))
                        break;
            }
        }
        else
        {
            for (i = edit->curs_line - 1; i; i--)
                if (line_is_blank (edit, i))
                    break;
        }
    }
    edit_move_up (edit, edit->curs_line - i, do_scroll);
}

/* moves down until a blank line is reached, or until just
   before a non-blank line is reached */
static void
edit_move_down_paragraph (WEdit * edit, int do_scroll)
{
    int i;
    if (edit->curs_line >= edit->total_lines - 1)
    {
        i = edit->total_lines;
    }
    else
    {
        if (line_is_blank (edit, edit->curs_line))
        {
            if (line_is_blank (edit, edit->curs_line + 1))
            {
                for (i = edit->curs_line + 1; i; i++)
                    if (!line_is_blank (edit, i) || i > edit->total_lines)
                    {
                        i--;
                        break;
                    }
            }
            else
            {
                for (i = edit->curs_line + 1; i; i++)
                    if (line_is_blank (edit, i) || i >= edit->total_lines)
                        break;
            }
        }
        else
        {
            for (i = edit->curs_line + 1; i; i++)
                if (line_is_blank (edit, i) || i >= edit->total_lines)
                    break;
        }
    }
    edit_move_down (edit, i - edit->curs_line, do_scroll);
}

static void
edit_begin_page (WEdit * edit)
{
    edit_update_curs_row (edit);
    edit_move_up (edit, edit->curs_row, 0);
}

static void
edit_end_page (WEdit * edit)
{
    edit_update_curs_row (edit);
    edit_move_down (edit, edit->num_widget_lines - edit->curs_row - 1, 0);
}


/* goto beginning of text */
static void
edit_move_to_top (WEdit * edit)
{
    if (edit->curs_line)
    {
        edit_cursor_move (edit, -edit->curs1);
        edit_move_to_prev_col (edit, 0);
        edit->force |= REDRAW_PAGE;
        edit->search_start = 0;
        edit_update_curs_row (edit);
    }
}


/* goto end of text */
static void
edit_move_to_bottom (WEdit * edit)
{
    if (edit->curs_line < edit->total_lines)
    {
        edit_move_down (edit, edit->total_lines - edit->curs_row, 0);
        edit->start_display = edit->last_byte;
        edit->start_line = edit->total_lines;
        edit_scroll_upward (edit, edit->num_widget_lines - 1);
        edit->force |= REDRAW_PAGE;
    }
}

/* goto beginning of line */
static void
edit_cursor_to_bol (WEdit * edit)
{
    edit_cursor_move (edit, edit_bol (edit, edit->curs1) - edit->curs1);
    edit->search_start = edit->curs1;
    edit->prev_col = edit_get_col (edit);
    edit->over_col = 0;
}

/* goto end of line */
static void
edit_cursor_to_eol (WEdit * edit)
{
    edit_cursor_move (edit, edit_eol (edit, edit->curs1) - edit->curs1);
    edit->search_start = edit->curs1;
    edit->prev_col = edit_get_col (edit);
    edit->over_col = 0;
}

/* move cursor to line 'line' */
void
edit_move_to_line (WEdit * e, long line)
{
    if (line < e->curs_line)
        edit_move_up (e, e->curs_line - line, 0);
    else
        edit_move_down (e, line - e->curs_line, 0);
    edit_scroll_screen_over_cursor (e);
}

/* scroll window so that first visible line is 'line' */
void
edit_move_display (WEdit * e, long line)
{
    if (line < e->start_line)
        edit_scroll_upward (e, e->start_line - line);
    else
        edit_scroll_downward (e, line - e->start_line);
}

/* save markers onto undo stack */
void
edit_push_markers (WEdit * edit)
{
    edit_push_action (edit, MARK_1 + edit->mark1);
    edit_push_action (edit, MARK_2 + edit->mark2);
}

void
edit_set_markers (WEdit * edit, long m1, long m2, int c1, int c2)
{
    edit->mark1 = m1;
    edit->mark2 = m2;
    edit->column1 = c1;
    edit->column2 = c2;
}


/* highlight marker toggle */
void
edit_mark_cmd (WEdit * edit, int unmark)
{
    edit_push_markers (edit);
    if (unmark)
    {
        edit_set_markers (edit, 0, 0, 0, 0);
        edit->force |= REDRAW_PAGE;
    }
    else
    {
        if (edit->mark2 >= 0)
        {
            edit_set_markers (edit, edit->curs1, -1, edit->curs_col + edit->over_col,
                              edit->curs_col + edit->over_col);
            edit->force |= REDRAW_PAGE;
        }
        else
            edit_set_markers (edit, edit->mark1, edit->curs1, edit->column1,
                              edit->curs_col + edit->over_col);
    }
}

static unsigned long
my_type_of (int c)
{
    int x, r = 0;
    const char *p, *q;
    const char option_chars_move_whole_word[] =
        "!=&|<>^~ !:;, !'!`!.?!\"!( !) !Aa0 !+-*/= |<> ![ !] !\\#! ";

    if (!c)
        return 0;
    if (c == '!')
    {
        if (*option_chars_move_whole_word == '!')
            return 2;
        return 0x80000000UL;
    }
    if (g_ascii_isupper ((gchar) c))
        c = 'A';
    else if (g_ascii_islower ((gchar) c))
        c = 'a';
    else if (g_ascii_isalpha (c))
        c = 'a';
    else if (isdigit (c))
        c = '0';
    else if (isspace (c))
        c = ' ';
    q = strchr (option_chars_move_whole_word, c);
    if (!q)
        return 0xFFFFFFFFUL;
    do
    {
        for (x = 1, p = option_chars_move_whole_word; p < q; p++)
            if (*p == '!')
                x <<= 1;
        r |= x;
    }
    while ((q = strchr (q + 1, c)));
    return r;
}

static void
edit_left_word_move (WEdit * edit, int s)
{
    for (;;)
    {
        int c1, c2;
        if (edit->column_highlight
            && edit->mark1 != edit->mark2
            && edit->over_col == 0 && edit->curs1 == edit_bol (edit, edit->curs1))
            break;
        edit_cursor_move (edit, -1);
        if (!edit->curs1)
            break;
        c1 = edit_get_byte (edit, edit->curs1 - 1);
        c2 = edit_get_byte (edit, edit->curs1);
        if (!(my_type_of (c1) & my_type_of (c2)))
            break;
        if (isspace (c1) && !isspace (c2))
            break;
        if (s)
            if (!isspace (c1) && isspace (c2))
                break;
    }
}

static void
edit_left_word_move_cmd (WEdit * edit)
{
    edit_left_word_move (edit, 0);
    edit->force |= REDRAW_PAGE;
}

static void
edit_right_word_move (WEdit * edit, int s)
{
    for (;;)
    {
        int c1, c2;
        if (edit->column_highlight
            && edit->mark1 != edit->mark2
            && edit->over_col == 0 && edit->curs1 == edit_eol (edit, edit->curs1))
            break;
        edit_cursor_move (edit, 1);
        if (edit->curs1 >= edit->last_byte)
            break;
        c1 = edit_get_byte (edit, edit->curs1 - 1);
        c2 = edit_get_byte (edit, edit->curs1);
        if (!(my_type_of (c1) & my_type_of (c2)))
            break;
        if (isspace (c1) && !isspace (c2))
            break;
        if (s)
            if (!isspace (c1) && isspace (c2))
                break;
    }
}

static void
edit_right_word_move_cmd (WEdit * edit)
{
    edit_right_word_move (edit, 0);
    edit->force |= REDRAW_PAGE;
}

static void
edit_right_char_move_cmd (WEdit * edit)
{
    int cw = 1;
    int c = 0;
    if (edit->utf8)
    {
        c = edit_get_utf (edit, edit->curs1, &cw);
        if (cw < 1)
            cw = 1;
    }
    else
    {
        c = edit_get_byte (edit, edit->curs1);
    }
    if (option_cursor_beyond_eol && c == '\n')
    {
        edit->over_col++;
    }
    else
    {
        edit_cursor_move (edit, cw);
    }
}

static void
edit_left_char_move_cmd (WEdit * edit)
{
    int cw = 1;
    if (edit->column_highlight
        && option_cursor_beyond_eol
        && edit->mark1 != edit->mark2
        && edit->over_col == 0 && edit->curs1 == edit_bol (edit, edit->curs1))
        return;
    if (edit->utf8)
    {
        edit_get_prev_utf (edit, edit->curs1, &cw);
        if (cw < 1)
            cw = 1;
    }
    if (option_cursor_beyond_eol && edit->over_col > 0)
    {
        edit->over_col--;
    }
    else
    {
        edit_cursor_move (edit, -cw);
    }
}

/** Up or down cursor moving.
 direction = TRUE - move up
           = FALSE - move down
*/
static void
edit_move_updown (WEdit * edit, unsigned long i, int do_scroll, gboolean direction)
{
    unsigned long p;
    unsigned long l = (direction) ? edit->curs_line : edit->total_lines - edit->curs_line;

    if (i > l)
        i = l;

    if (i == 0)
        return;

    if (i > 1)
        edit->force |= REDRAW_PAGE;
    if (do_scroll)
    {
        if (direction)
            edit_scroll_upward (edit, i);
        else
            edit_scroll_downward (edit, i);
    }
    p = edit_bol (edit, edit->curs1);

    p = (direction) ? edit_move_backward (edit, p, i) : edit_move_forward (edit, p, i, 0);

    edit_cursor_move (edit, p - edit->curs1);

    edit_move_to_prev_col (edit, p);

    /* search start of current multibyte char (like CJK) */
    if (edit->curs1 + 1 < edit->last_byte)
    {
        edit_right_char_move_cmd (edit);
        edit_left_char_move_cmd (edit);
    }

    edit->search_start = edit->curs1;
    edit->found_len = 0;
}

static void
edit_right_delete_word (WEdit * edit)
{
    int c1, c2;
    for (;;)
    {
        if (edit->curs1 >= edit->last_byte)
            break;
        c1 = edit_delete (edit, 1);
        c2 = edit_get_byte (edit, edit->curs1);
        if ((isspace (c1) == 0) != (isspace (c2) == 0))
            break;
        if (!(my_type_of (c1) & my_type_of (c2)))
            break;
    }
}

static void
edit_left_delete_word (WEdit * edit)
{
    int c1, c2;
    for (;;)
    {
        if (edit->curs1 <= 0)
            break;
        c1 = edit_backspace (edit, 1);
        c2 = edit_get_byte (edit, edit->curs1 - 1);
        if ((isspace (c1) == 0) != (isspace (c2) == 0))
            break;
        if (!(my_type_of (c1) & my_type_of (c2)))
            break;
    }
}

/*
   the start column position is not recorded, and hence does not
   undo as it happed. But who would notice.
 */
static void
edit_do_undo (WEdit * edit)
{
    long ac;
    long count = 0;

    edit->stack_disable = 1;    /* don't record undo's onto undo stack! */
    edit->over_col = 0;
    while ((ac = pop_action (edit)) < KEY_PRESS)
    {
        switch ((int) ac)
        {
        case STACK_BOTTOM:
            goto done_undo;
        case CURS_RIGHT:
            edit_cursor_move (edit, 1);
            break;
        case CURS_LEFT:
            edit_cursor_move (edit, -1);
            break;
        case BACKSPACE:
            edit_backspace (edit, 1);
            break;
        case DELCHAR:
            edit_delete (edit, 1);
            break;
        case COLUMN_ON:
            edit->column_highlight = 1;
            break;
        case COLUMN_OFF:
            edit->column_highlight = 0;
            break;
        }
        if (ac >= 256 && ac < 512)
            edit_insert_ahead (edit, ac - 256);
        if (ac >= 0 && ac < 256)
            edit_insert (edit, ac);

        if (ac >= MARK_1 - 2 && ac < MARK_2 - 2)
        {
            edit->mark1 = ac - MARK_1;
            edit->column1 = edit_move_forward3 (edit, edit_bol (edit, edit->mark1), 0, edit->mark1);
        }
        else if (ac >= MARK_2 - 2 && ac < KEY_PRESS)
        {
            edit->mark2 = ac - MARK_2;
            edit->column2 = edit_move_forward3 (edit, edit_bol (edit, edit->mark2), 0, edit->mark2);
        }
        if (count++)
            edit->force |= REDRAW_PAGE; /* more than one pop usually means something big */
    }

    if (edit->start_display > ac - KEY_PRESS)
    {
        edit->start_line -= edit_count_lines (edit, ac - KEY_PRESS, edit->start_display);
        edit->force |= REDRAW_PAGE;
    }
    else if (edit->start_display < ac - KEY_PRESS)
    {
        edit->start_line += edit_count_lines (edit, edit->start_display, ac - KEY_PRESS);
        edit->force |= REDRAW_PAGE;
    }
    edit->start_display = ac - KEY_PRESS;       /* see push and pop above */
    edit_update_curs_row (edit);

  done_undo:;
    edit->stack_disable = 0;
}

static void
edit_delete_to_line_end (WEdit * edit)
{
    while (edit_get_byte (edit, edit->curs1) != '\n')
    {
        if (!edit->curs2)
            break;
        edit_delete (edit, 1);
    }
}

static void
edit_delete_to_line_begin (WEdit * edit)
{
    while (edit_get_byte (edit, edit->curs1 - 1) != '\n')
    {
        if (!edit->curs1)
            break;
        edit_backspace (edit, 1);
    }
}

void
edit_delete_line (WEdit * edit)
{
    /*
     * Delete right part of the line.
     * Note that edit_get_byte() returns '\n' when byte position is
     *   beyond EOF.
     */
    while (edit_get_byte (edit, edit->curs1) != '\n')
    {
        (void) edit_delete (edit, 1);
    }

    /*
     * Delete '\n' char.
     * Note that edit_delete() will not corrupt anything if called while
     *   cursor position is EOF.
     */
    (void) edit_delete (edit, 1);

    /*
     * Delete left part of the line.
     * Note, that edit_get_byte() returns '\n' when byte position is < 0.
     */
    while (edit_get_byte (edit, edit->curs1 - 1) != '\n')
    {
        (void) edit_backspace (edit, 1);
    }
}

void
insert_spaces_tab (WEdit * edit, int half)
{
    int i;
    edit_update_curs_col (edit);
    i = ((edit->curs_col / (option_tab_spacing * space_width / (half + 1))) +
         1) * (option_tab_spacing * space_width / (half + 1)) - edit->curs_col;
    while (i > 0)
    {
        edit_insert (edit, ' ');
        i -= space_width;
    }
}

static int
is_aligned_on_a_tab (WEdit * edit)
{
    edit_update_curs_col (edit);
    return !((edit->curs_col % (TAB_SIZE * space_width))
             && edit->curs_col % (TAB_SIZE * space_width) != (HALF_TAB_SIZE * space_width));
}

static int
right_of_four_spaces (WEdit * edit)
{
    int i, ch = 0;
    for (i = 1; i <= HALF_TAB_SIZE; i++)
        ch |= edit_get_byte (edit, edit->curs1 - i);
    if (ch == ' ')
        return is_aligned_on_a_tab (edit);
    return 0;
}

static int
left_of_four_spaces (WEdit * edit)
{
    int i, ch = 0;
    for (i = 0; i < HALF_TAB_SIZE; i++)
        ch |= edit_get_byte (edit, edit->curs1 + i);
    if (ch == ' ')
        return is_aligned_on_a_tab (edit);
    return 0;
}

int
edit_indent_width (WEdit * edit, long p)
{
    long q = p;
    while (strchr ("\t ", edit_get_byte (edit, q)) && q < edit->last_byte - 1)  /* move to the end of the leading whitespace of the line */
        q++;
    return edit_move_forward3 (edit, p, 0, q);  /* count the number of columns of indentation */
}

void
edit_insert_indent (WEdit * edit, int indent)
{
    if (!option_fill_tabs_with_spaces)
    {
        while (indent >= TAB_SIZE)
        {
            edit_insert (edit, '\t');
            indent -= TAB_SIZE;
        }
    }
    while (indent-- > 0)
        edit_insert (edit, ' ');
}

static void
edit_auto_indent (WEdit * edit)
{
    long p;
    char c;
    p = edit->curs1;
    /* use the previous line as a template */
    p = edit_move_backward (edit, p, 1);
    /* copy the leading whitespace of the line */
    for (;;)
    {                           /* no range check - the line _is_ \n-terminated */
        c = edit_get_byte (edit, p++);
        if (c != ' ' && c != '\t')
            break;
        edit_insert (edit, c);
    }
}

static inline void
edit_double_newline (WEdit * edit)
{
    edit_insert (edit, '\n');
    if (edit_get_byte (edit, edit->curs1) == '\n')
        return;
    if (edit_get_byte (edit, edit->curs1 - 2) == '\n')
        return;
    edit->force |= REDRAW_PAGE;
    edit_insert (edit, '\n');
}

static inline void
edit_tab_cmd (WEdit * edit)
{
    int i;

    if (option_fake_half_tabs)
    {
        if (is_in_indent (edit))
        {
            /*insert a half tab (usually four spaces) unless there is a
               half tab already behind, then delete it and insert a
               full tab. */
            if (!option_fill_tabs_with_spaces && right_of_four_spaces (edit))
            {
                for (i = 1; i <= HALF_TAB_SIZE; i++)
                    edit_backspace (edit, 1);
                edit_insert (edit, '\t');
            }
            else
            {
                insert_spaces_tab (edit, 1);
            }
            return;
        }
    }
    if (option_fill_tabs_with_spaces)
    {
        insert_spaces_tab (edit, 0);
    }
    else
    {
        edit_insert (edit, '\t');
    }
}

static void
check_and_wrap_line (WEdit * edit)
{
    int curs, c;
    if (!option_typewriter_wrap)
        return;
    edit_update_curs_col (edit);
    if (edit->curs_col < option_word_wrap_line_length)
        return;
    curs = edit->curs1;
    for (;;)
    {
        curs--;
        c = edit_get_byte (edit, curs);
        if (c == '\n' || curs <= 0)
        {
            edit_insert (edit, '\n');
            return;
        }
        if (c == ' ' || c == '\t')
        {
            int current = edit->curs1;
            edit_cursor_move (edit, curs - edit->curs1 + 1);
            edit_insert (edit, '\n');
            edit_cursor_move (edit, current - edit->curs1 + 1);
            return;
        }
    }
}

static inline void edit_execute_macro (WEdit * edit, struct macro macro[], int n);

void
edit_push_key_press (WEdit * edit)
{
    edit_push_action (edit, KEY_PRESS + edit->start_display);
    if (edit->mark2 == -1)
        edit_push_action (edit, MARK_1 + edit->mark1);
}

/* this find the matching bracket in either direction, and sets edit->bracket */
static long
edit_get_bracket (WEdit * edit, int in_screen, unsigned long furthest_bracket_search)
{
    const char *const b = "{}{[][()(", *p;
    int i = 1, a, inc = -1, c, d, n = 0;
    unsigned long j = 0;
    long q;
    edit_update_curs_row (edit);
    c = edit_get_byte (edit, edit->curs1);
    p = strchr (b, c);
    /* no limit */
    if (!furthest_bracket_search)
        furthest_bracket_search--;
    /* not on a bracket at all */
    if (!p)
        return -1;
    /* the matching bracket */
    d = p[1];
    /* going left or right? */
    if (strchr ("{[(", c))
        inc = 1;
    for (q = edit->curs1 + inc;; q += inc)
    {
        /* out of buffer? */
        if (q >= edit->last_byte || q < 0)
            break;
        a = edit_get_byte (edit, q);
        /* don't want to eat CPU */
        if (j++ > furthest_bracket_search)
            break;
        /* out of screen? */
        if (in_screen)
        {
            if (q < edit->start_display)
                break;
            /* count lines if searching downward */
            if (inc > 0 && a == '\n')
                if (n++ >= edit->num_widget_lines - edit->curs_row)     /* out of screen */
                    break;
        }
        /* count bracket depth */
        i += (a == c) - (a == d);
        /* return if bracket depth is zero */
        if (!i)
            return q;
    }
    /* no match */
    return -1;
}

static long last_bracket = -1;

void
edit_find_bracket (WEdit * edit)
{
    edit->bracket = edit_get_bracket (edit, 1, 10000);
    if (last_bracket != edit->bracket)
        edit->force |= REDRAW_PAGE;
    last_bracket = edit->bracket;
}

static inline void
edit_goto_matching_bracket (WEdit * edit)
{
    long q;

    q = edit_get_bracket (edit, 0, 0);
    if (q >= 0)
    {
        edit->bracket = edit->curs1;
        edit->force |= REDRAW_PAGE;
        edit_cursor_move (edit, q - edit->curs1);
    }
}

/*
 * This executes a command as though the user initiated it through a key
 * press.  Callback with WIDGET_KEY as a message calls this after
 * translating the key press.  This function can be used to pass any
 * command to the editor.  Note that the screen wouldn't update
 * automatically.  Either of command or char_for_insertion must be
 * passed as -1.  Commands are executed, and char_for_insertion is
 * inserted at the cursor.
 */
void
edit_execute_key_command (WEdit * edit, unsigned long command, int char_for_insertion)
{
    if (command == CK_Begin_Record_Macro)
    {
        edit->macro_i = 0;
        edit->force |= REDRAW_CHAR_ONLY | REDRAW_LINE;
        return;
    }
    if (command == CK_End_Record_Macro && edit->macro_i != -1)
    {
        edit->force |= REDRAW_COMPLETELY;
        edit_save_macro_cmd (edit, edit->macro, edit->macro_i);
        edit->macro_i = -1;
        return;
    }
    if (edit->macro_i >= 0 && edit->macro_i < MAX_MACRO_LENGTH - 1)
    {
        edit->macro[edit->macro_i].command = command;
        edit->macro[edit->macro_i++].ch = char_for_insertion;
    }
    /* record the beginning of a set of editing actions initiated by a key press */
    if (command != CK_Undo && command != CK_Ext_Mode)
        edit_push_key_press (edit);

    edit_execute_cmd (edit, command, char_for_insertion);
    if (edit->column_highlight)
        edit->force |= REDRAW_PAGE;
}

static const char *const shell_cmd[] = SHELL_COMMANDS_i;

/*
   This executes a command at a lower level than macro recording.
   It also does not push a key_press onto the undo stack. This means
   that if it is called many times, a single undo command will undo
   all of them. It also does not check for the Undo command.
 */
void
edit_execute_cmd (WEdit * edit, unsigned long command, int char_for_insertion)
{
    edit->force |= REDRAW_LINE;

    /* The next key press will unhighlight the found string, so update
     * the whole page */
    if (edit->found_len || edit->column_highlight)
        edit->force |= REDRAW_PAGE;

    if (command / 100 == 6)
    {                           /* a highlight command like shift-arrow */
        edit->column_highlight = 0;
        if (!edit->highlight || (edit->mark2 != -1 && edit->mark1 != edit->mark2))
        {
            edit_mark_cmd (edit, 1);    /* clear */
            edit_mark_cmd (edit, 0);    /* marking on */
        }
        edit->highlight = 1;
    }
    else
    {                           /* any other command */
        if (edit->highlight)
            edit_mark_cmd (edit, 0);    /* clear */
        edit->highlight = 0;
    }

    /* first check for undo */
    if (command == CK_Undo)
    {
        edit_do_undo (edit);
        edit->found_len = 0;
        edit->prev_col = edit_get_col (edit);
        edit->search_start = edit->curs1;
        return;
    }

    /* An ordinary key press */
    if (char_for_insertion >= 0)
    {
        /* if non persistent selection and text selected */
        if (!option_persistent_selections)
        {
            if (edit->mark1 != edit->mark2)
                edit_block_delete_cmd (edit);
        }
        if (edit->overwrite)
        {
            /* remove char only one time, after input first byte, multibyte chars */
            if ((!utf8_display || edit->charpoint == 0)
                && edit_get_byte (edit, edit->curs1) != '\n')
                edit_delete (edit, 0);
        }
        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);
#ifdef HAVE_CHARSET
        if (char_for_insertion > 255 && utf8_display == 0)
        {
            unsigned char str[6 + 1];
            size_t i = 0;
            int res = g_unichar_to_utf8 (char_for_insertion, (char *) str);
            if (res == 0)
            {
                str[0] = '.';
                str[1] = '\0';
            }
            else
            {
                str[res] = '\0';
            }
            while (str[i] != 0 && i <= 6)
            {
                char_for_insertion = str[i];
                edit_insert (edit, char_for_insertion);
                i++;
            }
        }
        else
#endif
            edit_insert (edit, char_for_insertion);

        if (option_auto_para_formatting)
        {
            format_paragraph (edit, 0);
            edit->force |= REDRAW_PAGE;
        }
        else
            check_and_wrap_line (edit);
        edit->found_len = 0;
        edit->prev_col = edit_get_col (edit);
        edit->search_start = edit->curs1;
        edit_find_bracket (edit);
        return;
    }

    switch (command)
    {
    case CK_Begin_Page:
    case CK_End_Page:
    case CK_Begin_Page_Highlight:
    case CK_End_Page_Highlight:
    case CK_Word_Left:
    case CK_Word_Right:
    case CK_Up:
    case CK_Down:
    case CK_Left:
    case CK_Right:
        if (edit->mark2 >= 0)
        {
            if (!option_persistent_selections)
            {
                if (edit->column_highlight)
                    edit_push_action (edit, COLUMN_ON);
                edit->column_highlight = 0;
                edit_mark_cmd (edit, 1);
            }
        }
    }

    switch (command)
    {
    case CK_Begin_Page:
    case CK_End_Page:
    case CK_Begin_Page_Highlight:
    case CK_End_Page_Highlight:
    case CK_Word_Left:
    case CK_Word_Right:
    case CK_Up:
    case CK_Down:
    case CK_Word_Left_Highlight:
    case CK_Word_Right_Highlight:
    case CK_Up_Highlight:
    case CK_Down_Highlight:
    case CK_Up_Alt_Highlight:
    case CK_Down_Alt_Highlight:
        if (edit->mark2 == -1)
            break;              /*marking is following the cursor: may need to highlight a whole line */
    case CK_Left:
    case CK_Right:
    case CK_Left_Highlight:
    case CK_Right_Highlight:
        edit->force |= REDRAW_CHAR_ONLY;
    }

    /* basic cursor key commands */
    switch (command)
    {
    case CK_BackSpace:
        /* if non persistent selection and text selected */
        if (!option_persistent_selections)
        {
            if (edit->mark1 != edit->mark2)
            {
                edit_block_delete_cmd (edit);
                break;
            }
        }
        if (option_cursor_beyond_eol && edit->over_col > 0)
        {
            edit->over_col--;
            break;
        }
        if (option_backspace_through_tabs && is_in_indent (edit))
        {
            while (edit_get_byte (edit, edit->curs1 - 1) != '\n' && edit->curs1 > 0)
                edit_backspace (edit, 1);
            break;
        }
        else
        {
            if (option_fake_half_tabs)
            {
                int i;
                if (is_in_indent (edit) && right_of_four_spaces (edit))
                {
                    for (i = 0; i < HALF_TAB_SIZE; i++)
                        edit_backspace (edit, 1);
                    break;
                }
            }
        }
        edit_backspace (edit, 0);
        break;
    case CK_Delete:
        /* if non persistent selection and text selected */
        if (!option_persistent_selections)
        {
            if (edit->mark1 != edit->mark2)
            {
                edit_block_delete_cmd (edit);
                break;
            }
        }

        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);

        if (option_fake_half_tabs)
        {
            int i;
            if (is_in_indent (edit) && left_of_four_spaces (edit))
            {
                for (i = 1; i <= HALF_TAB_SIZE; i++)
                    edit_delete (edit, 1);
                break;
            }
        }
        edit_delete (edit, 0);
        break;
    case CK_Delete_Word_Left:
        edit->over_col = 0;
        edit_left_delete_word (edit);
        break;
    case CK_Delete_Word_Right:
        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);

        edit_right_delete_word (edit);
        break;
    case CK_Delete_Line:
        edit_delete_line (edit);
        break;
    case CK_Delete_To_Line_End:
        edit_delete_to_line_end (edit);
        break;
    case CK_Delete_To_Line_Begin:
        edit_delete_to_line_begin (edit);
        break;
    case CK_Enter:
        edit->over_col = 0;
        if (option_auto_para_formatting)
        {
            edit_double_newline (edit);
            if (option_return_does_auto_indent)
                edit_auto_indent (edit);
            format_paragraph (edit, 0);
        }
        else
        {
            edit_insert (edit, '\n');
            if (option_return_does_auto_indent)
            {
                edit_auto_indent (edit);
            }
        }
        break;
    case CK_Return:
        edit_insert (edit, '\n');
        break;

    case CK_Page_Up_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Page_Up:
    case CK_Page_Up_Highlight:
        edit_move_up (edit, edit->num_widget_lines - 1, 1);
        break;
    case CK_Page_Down_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Page_Down:
    case CK_Page_Down_Highlight:
        edit_move_down (edit, edit->num_widget_lines - 1, 1);
        break;
    case CK_Left_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Left:
    case CK_Left_Highlight:
        if (option_fake_half_tabs)
        {
            if (is_in_indent (edit) && right_of_four_spaces (edit))
            {
                if (option_cursor_beyond_eol && edit->over_col > 0)
                    edit->over_col--;
                else
                    edit_cursor_move (edit, -HALF_TAB_SIZE);
                edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
                break;
            }
        }
        edit_left_char_move_cmd (edit);
        break;
    case CK_Right_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Right:
    case CK_Right_Highlight:
        if (option_fake_half_tabs)
        {
            if (is_in_indent (edit) && left_of_four_spaces (edit))
            {
                edit_cursor_move (edit, HALF_TAB_SIZE);
                edit->force &= (0xFFF - REDRAW_CHAR_ONLY);
                break;
            }
        }
        edit_right_char_move_cmd (edit);
        break;
    case CK_Begin_Page:
    case CK_Begin_Page_Highlight:
        edit_begin_page (edit);
        break;
    case CK_End_Page:
    case CK_End_Page_Highlight:
        edit_end_page (edit);
        break;
    case CK_Word_Left:
    case CK_Word_Left_Highlight:
        edit->over_col = 0;
        edit_left_word_move_cmd (edit);
        break;
    case CK_Word_Right:
    case CK_Word_Right_Highlight:
        edit->over_col = 0;
        edit_right_word_move_cmd (edit);
        break;
    case CK_Up_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Up:
    case CK_Up_Highlight:
        edit_move_up (edit, 1, 0);
        break;
    case CK_Down_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Down:
    case CK_Down_Highlight:
        edit_move_down (edit, 1, 0);
        break;
    case CK_Paragraph_Up_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Paragraph_Up:
    case CK_Paragraph_Up_Highlight:
        edit_move_up_paragraph (edit, 0);
        break;
    case CK_Paragraph_Down_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Paragraph_Down:
    case CK_Paragraph_Down_Highlight:
        edit_move_down_paragraph (edit, 0);
        break;
    case CK_Scroll_Up_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Scroll_Up:
    case CK_Scroll_Up_Highlight:
        edit_move_up (edit, 1, 1);
        break;
    case CK_Scroll_Down_Alt_Highlight:
        edit->column_highlight = 1;
    case CK_Scroll_Down:
    case CK_Scroll_Down_Highlight:
        edit_move_down (edit, 1, 1);
        break;
    case CK_Home:
    case CK_Home_Highlight:
        edit_cursor_to_bol (edit);
        break;
    case CK_End:
    case CK_End_Highlight:
        edit_cursor_to_eol (edit);
        break;
    case CK_Tab:
        /* if text marked shift block */
        if (edit->mark1 != edit->mark2 && !option_persistent_selections)
        {
            if (edit->mark2 < 0)
                edit_mark_cmd (edit, 0);
            edit_move_block_to_right (edit);
        }
        else
        {
            if (option_cursor_beyond_eol)
                edit_insert_over (edit);
            edit_tab_cmd (edit);
            if (option_auto_para_formatting)
            {
                format_paragraph (edit, 0);
                edit->force |= REDRAW_PAGE;
            }
            else
            {
                check_and_wrap_line (edit);
            }
        }
        break;

    case CK_Toggle_Insert:
        edit->overwrite = (edit->overwrite == 0);
        break;

    case CK_Mark:
        if (edit->mark2 >= 0)
        {
            if (edit->column_highlight)
                edit_push_action (edit, COLUMN_ON);
            edit->column_highlight = 0;
        }
        edit_mark_cmd (edit, 0);
        break;
    case CK_Column_Mark:
        if (!edit->column_highlight)
            edit_push_action (edit, COLUMN_OFF);
        edit->column_highlight = 1;
        edit_mark_cmd (edit, 0);
        break;
    case CK_Mark_All:
        edit_set_markers (edit, 0, edit->last_byte, 0, 0);
        edit->force |= REDRAW_PAGE;
        break;
    case CK_Unmark:
        if (edit->column_highlight)
            edit_push_action (edit, COLUMN_ON);
        edit->column_highlight = 0;
        edit_mark_cmd (edit, 1);
        break;

    case CK_Toggle_Line_State:
        option_line_state = !option_line_state;
        if (option_line_state)
        {
            option_line_state_width = LINE_STATE_WIDTH;
        }
        else
        {
            option_line_state_width = 0;
        }
        edit->force |= REDRAW_PAGE;
        break;

    case CK_Toggle_Show_Margin:
        show_right_margin = !show_right_margin;
        edit->force |= REDRAW_PAGE;
        break;

    case CK_Toggle_Bookmark:
        book_mark_clear (edit, edit->curs_line, BOOK_MARK_FOUND_COLOR);
        if (book_mark_query_color (edit, edit->curs_line, BOOK_MARK_COLOR))
            book_mark_clear (edit, edit->curs_line, BOOK_MARK_COLOR);
        else
            book_mark_insert (edit, edit->curs_line, BOOK_MARK_COLOR);
        break;
    case CK_Flush_Bookmarks:
        book_mark_flush (edit, BOOK_MARK_COLOR);
        book_mark_flush (edit, BOOK_MARK_FOUND_COLOR);
        edit->force |= REDRAW_PAGE;
        break;
    case CK_Next_Bookmark:
        if (edit->book_mark)
        {
            struct _book_mark *p;
            p = (struct _book_mark *) book_mark_find (edit, edit->curs_line);
            if (p->next)
            {
                p = p->next;
                if (p->line >= edit->start_line + edit->num_widget_lines
                    || p->line < edit->start_line)
                    edit_move_display (edit, p->line - edit->num_widget_lines / 2);
                edit_move_to_line (edit, p->line);
            }
        }
        break;
    case CK_Prev_Bookmark:
        if (edit->book_mark)
        {
            struct _book_mark *p;
            p = (struct _book_mark *) book_mark_find (edit, edit->curs_line);
            while (p->line == edit->curs_line)
                if (p->prev)
                    p = p->prev;
            if (p->line >= 0)
            {
                if (p->line >= edit->start_line + edit->num_widget_lines
                    || p->line < edit->start_line)
                    edit_move_display (edit, p->line - edit->num_widget_lines / 2);
                edit_move_to_line (edit, p->line);
            }
        }
        break;

    case CK_Beginning_Of_Text:
    case CK_Beginning_Of_Text_Highlight:
        edit_move_to_top (edit);
        break;
    case CK_End_Of_Text:
    case CK_End_Of_Text_Highlight:
        edit_move_to_bottom (edit);
        break;

    case CK_Copy:
        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);
        edit_block_copy_cmd (edit);
        break;
    case CK_Remove:
        edit_block_delete_cmd (edit);
        break;
    case CK_Move:
        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);
        edit_block_move_cmd (edit);
        break;

    case CK_Shift_Block_Left:
        if (edit->mark1 != edit->mark2)
            edit_move_block_to_left (edit);
        break;
    case CK_Shift_Block_Right:
        if (edit->mark1 != edit->mark2)
            edit_move_block_to_right (edit);
        break;
    case CK_XStore:
        edit_copy_to_X_buf_cmd (edit);
        break;
    case CK_XCut:
        edit_cut_to_X_buf_cmd (edit);
        break;
    case CK_XPaste:
        /* if non persistent selection and text selected */
        if (!option_persistent_selections)
        {
            if (edit->mark1 != edit->mark2)
                edit_block_delete_cmd (edit);
        }
        if (option_cursor_beyond_eol && edit->over_col > 0)
            edit_insert_over (edit);
        edit_paste_from_X_buf_cmd (edit);
        break;
    case CK_Selection_History:
        edit_paste_from_history (edit);
        break;

    case CK_Save_As:
        edit_save_as_cmd (edit);
        break;
    case CK_Save:
        edit_save_confirm_cmd (edit);
        break;
    case CK_Load:
        edit_load_cmd (edit, EDIT_FILE_COMMON);
        break;
    case CK_Save_Block:
        edit_save_block_cmd (edit);
        break;
    case CK_Insert_File:
        edit_insert_file_cmd (edit);
        break;

    case CK_Load_Prev_File:
        edit_load_back_cmd (edit);
        break;
    case CK_Load_Next_File:
        edit_load_forward_cmd (edit);
        break;

    case CK_Load_Syntax_File:
        edit_load_cmd (edit, EDIT_FILE_SYNTAX);
        break;
    case CK_Choose_Syntax:
        edit_syntax_dialog (edit, edit->syntax_type);
        break;

    case CK_Load_Menu_File:
        edit_load_cmd (edit, EDIT_FILE_MENU);
        break;

    case CK_Toggle_Syntax:
        option_syntax_highlighting ^= 1;
        if (option_syntax_highlighting == 1)
            edit_load_syntax (edit, NULL, edit->syntax_type);
        edit->force |= REDRAW_PAGE;
        break;

    case CK_Toggle_Tab_TWS:
        enable_show_tabs_tws ^= 1;
        edit->force |= REDRAW_PAGE;
        break;

    case CK_Find:
        edit_search_cmd (edit, 0);
        break;
    case CK_Find_Again:
        edit_search_cmd (edit, 1);
        break;
    case CK_Replace:
        edit_replace_cmd (edit, 0);
        break;
    case CK_Replace_Again:
        edit_replace_cmd (edit, 1);
        break;
    case CK_Complete_Word:
        /* if text marked shift block */
        if (edit->mark1 != edit->mark2 && !option_persistent_selections)
        {
            edit_move_block_to_left (edit);
        }
        else
        {
            edit_complete_word_cmd (edit);
        }
        break;
    case CK_Find_Definition:
        edit_get_match_keyword_cmd (edit);
        break;
    case CK_Quit:
        dlg_stop (edit->widget.owner);
        break;
    case CK_New:
        edit_new_cmd (edit);
        break;
    case CK_Help:
        edit_help_cmd (edit);
        break;
    case CK_Refresh:
        edit_refresh_cmd (edit);
        break;
    case CK_SaveSetupCmd:
        save_setup_cmd ();
        break;
    case CK_About:
        edit_about ();
        break;
    case CK_LearnKeys:
        learn_keys ();
        break;
    case CK_Edit_Options:
        edit_options_dialog (edit);
        break;
    case CK_Edit_Save_Mode:
        menu_save_mode_cmd ();
        break;
    case CK_Date:
        {
            char s[BUF_MEDIUM];
            /* fool gcc to prevent a Y2K warning */
            char time_format[] = "_c";
            time_format[0] = '%';

            FMT_LOCALTIME_CURRENT (s, sizeof (s), time_format);
            edit_print_string (edit, s);
            edit->force |= REDRAW_PAGE;
            break;
        }
        break;
    case CK_Goto:
        edit_goto_cmd (edit);
        break;
    case CK_Paragraph_Format:
        format_paragraph (edit, 1);
        edit->force |= REDRAW_PAGE;
        break;
    case CK_Delete_Macro:
        edit_delete_macro_cmd (edit);
        break;
    case CK_Match_Bracket:
        edit_goto_matching_bracket (edit);
        break;
    case CK_User_Menu:
        user_menu (edit);
        break;
    case CK_Sort:
        edit_sort_cmd (edit);
        break;
    case CK_ExtCmd:
        edit_ext_cmd (edit);
        break;
    case CK_Mail:
        edit_mail_dialog (edit);
        break;
    case CK_Shell:
        view_other_cmd ();
        break;
    case CK_SelectCodepage:
        edit_select_codepage_cmd (edit);
        break;
    case CK_Insert_Literal:
        edit_insert_literal_cmd (edit);
        break;
    case CK_Execute_Macro:
        edit_execute_macro_cmd (edit);
        break;
    case CK_Begin_End_Macro:
        edit_begin_end_macro_cmd (edit);
        break;
    case CK_Ext_Mode:
        edit->extmod = 1;
        break;
    default:
        break;
    }

    /* CK_Pipe_Block */
    if ((command / 1000) == 1)  /* a shell command */
        edit_block_process_cmd (edit, shell_cmd[command - 1000], 1);
    if (command > CK_Macro (0) && command <= CK_Last_Macro)
    {                           /* a macro command */
        struct macro m[MAX_MACRO_LENGTH];
        int nm;
        if (edit_load_macro_cmd (edit, m, &nm, command - 2000))
            edit_execute_macro (edit, m, nm);
    }

    /* keys which must set the col position, and the search vars */
    switch (command)
    {
    case CK_Find:
    case CK_Find_Again:
    case CK_Replace:
    case CK_Replace_Again:
    case CK_Complete_Word:
        edit->prev_col = edit_get_col (edit);
        break;
    case CK_Up:
    case CK_Up_Highlight:
    case CK_Up_Alt_Highlight:
    case CK_Down:
    case CK_Down_Highlight:
    case CK_Down_Alt_Highlight:
    case CK_Page_Up:
    case CK_Page_Up_Highlight:
    case CK_Page_Up_Alt_Highlight:
    case CK_Page_Down:
    case CK_Page_Down_Highlight:
    case CK_Page_Down_Alt_Highlight:
    case CK_Beginning_Of_Text:
    case CK_Beginning_Of_Text_Highlight:
    case CK_End_Of_Text:
    case CK_End_Of_Text_Highlight:
    case CK_Paragraph_Up:
    case CK_Paragraph_Up_Highlight:
    case CK_Paragraph_Up_Alt_Highlight:
    case CK_Paragraph_Down:
    case CK_Paragraph_Down_Highlight:
    case CK_Paragraph_Down_Alt_Highlight:
    case CK_Scroll_Up:
    case CK_Scroll_Up_Highlight:
    case CK_Scroll_Up_Alt_Highlight:
    case CK_Scroll_Down:
    case CK_Scroll_Down_Highlight:
    case CK_Scroll_Down_Alt_Highlight:
        edit->search_start = edit->curs1;
        edit->found_len = 0;
        break;
    default:
        edit->found_len = 0;
        edit->prev_col = edit_get_col (edit);
        edit->search_start = edit->curs1;
    }
    edit_find_bracket (edit);

    if (option_auto_para_formatting)
    {
        switch (command)
        {
        case CK_BackSpace:
        case CK_Delete:
        case CK_Delete_Word_Left:
        case CK_Delete_Word_Right:
        case CK_Delete_To_Line_End:
        case CK_Delete_To_Line_Begin:
            format_paragraph (edit, 0);
            edit->force |= REDRAW_PAGE;
        }
    }
}


static void
edit_execute_macro (WEdit * edit, struct macro macro[], int n)
{
    int i = 0;

    if (edit->macro_depth++ > 256)
    {
        edit_error_dialog (_("Error"), _("Macro recursion is too deep"));
        edit->macro_depth--;
        return;
    }
    edit->force |= REDRAW_PAGE;
    for (; i < n; i++)
    {
        edit_execute_cmd (edit, macro[i].command, macro[i].ch);
    }
    edit_update_screen (edit);
    edit->macro_depth--;
}

/* User edit menu, like user menu (F2) but only in editor. */
static void
user_menu (WEdit * edit)
{
    char *block_file;
    int nomark;
    long start_mark, end_mark;
    struct stat status;

    block_file = concat_dir_and_file (home_dir, EDIT_BLOCK_FILE);

    nomark = eval_marks (edit, &start_mark, &end_mark);
    if (nomark == 0)
        edit_save_block (edit, block_file, start_mark, end_mark);

    /* run shell scripts from menu */
    user_menu_cmd (edit);

    if ((mc_stat (block_file, &status) == 0) && (status.st_size != 0))
    {
        int rc = 0;
        FILE *fd;

        if (nomark == 0)
        {
            /* i.e. we have marked block */
            rc = edit_block_delete_cmd (edit);
        }

        if (rc == 0)
            edit_insert_file (edit, block_file);

        /* truncate block file */
        fd = fopen (block_file, "w");
        if (fd != NULL)
            fclose (fd);
    }
    edit_refresh_cmd (edit);
    edit->force |= REDRAW_COMPLETELY;

    g_free (block_file);
}

void
edit_stack_init (void)
{
    for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
    {
        edit_history_moveto[edit_stack_iterator].filename = NULL;
        edit_history_moveto[edit_stack_iterator].line = -1;
    }

    edit_stack_iterator = 0;
}

void
edit_stack_free (void)
{
    for (edit_stack_iterator = 0; edit_stack_iterator < MAX_HISTORY_MOVETO; edit_stack_iterator++)
        g_free (edit_history_moveto[edit_stack_iterator].filename);
}

/* move i lines */
void
edit_move_up (WEdit * edit, unsigned long i, int do_scroll)
{
    edit_move_updown (edit, i, do_scroll, TRUE);
}

/* move i lines */
void
edit_move_down (WEdit * edit, unsigned long i, int do_scroll)
{
    edit_move_updown (edit, i, do_scroll, FALSE);
}

unsigned int
edit_unlock_file (WEdit * edit)
{
    char *fullpath;
    unsigned int ret;

    fullpath = g_build_filename (edit->dir, edit->filename, (char *) NULL);
    ret = unlock_file (fullpath);
    g_free (fullpath);

    return ret;
}

unsigned int
edit_lock_file (WEdit * edit)
{
    char *fullpath;
    unsigned int ret;

    fullpath = g_build_filename (edit->dir, edit->filename, (char *) NULL);
    ret = lock_file (fullpath);
    g_free (fullpath);

    return ret;
}