src/viewer/plain.c

   1 /*
   2    Internal file viewer for the Midnight Commander
   3    Function for plain view
   4
   5    Copyright (C) 1994, 1995, 1996, 1998, 1999, 2000, 2001, 2002, 2003,
   6    2004, 2005, 2006, 2007, 2009 Free Software Foundation, Inc.
   7
   8    Written by: 1994, 1995, 1998 Miguel de Icaza
   9                1994, 1995 Janne Kukonlehto
  10                1995 Jakub Jelinek
  11                1996 Joseph M. Hinkle
  12                1997 Norbert Warmuth
  13                1998 Pavel Machek
  14                2004 Roland Illig <roland.illig@gmx.de>
  15                2005 Roland Illig <roland.illig@gmx.de>
  16                2009 Slava Zanko <slavazanko@google.com>
  17                2009 Andrew Borodin <aborodin@vmail.ru>
  18                2009 Ilia Maslakov <il.smind@gmail.com>
  19
  20    This file is part of the Midnight Commander.
  21
  22    The Midnight Commander is free software; you can redistribute it
  23    and/or modify it under the terms of the GNU General Public License as
  24    published by the Free Software Foundation; either version 2 of the
  25    License, or (at your option) any later version.
  26
  27    The Midnight Commander is distributed in the hope that it will be
  28    useful, but WITHOUT ANY WARRANTY; without even the implied warranty
  29    of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  30    General Public License for more details.
  31
  32    You should have received a copy of the GNU General Public License
  33    along with this program; if not, write to the Free Software
  34    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  35    MA 02110-1301, USA.
  36  */
  37
  38 #include <config.h>
  39
  40 #include "../src/global.h"
  41 #include "../src/myslang.h"
  42 #include "../src/main.h"
  43 #include "../src/color.h"
  44 #include "../src/charsets.h"
  45 #include "../src/viewer/internal.h"
  46
  47 /*** global variables ****************************************************************************/
  48
  49 /*** file scope macro definitions ****************************************************************/
  50
  51 /*** file scope type declarations ****************************************************************/
  52
  53 /*** file scope variables ************************************************************************/
  54
  55 /*** file scope functions ************************************************************************/
  56
  57 /*** public functions ****************************************************************************/
  58
  59 /* --------------------------------------------------------------------------------------------- */
  60
  61 void
  62 mcview_display_text (mcview_t * view)
  63 {
  64     const screen_dimen left = view->data_area.left;
  65     const screen_dimen top = view->data_area.top;
  66     const screen_dimen width = view->data_area.width;
  67     const screen_dimen height = view->data_area.height;
  68     screen_dimen row, col;
  69     off_t from;
  70     int cw = 1;
  71     int c;
  72     struct hexedit_change_node *curr = view->change_list;
  73
  74     mcview_display_clean (view);
  75     mcview_display_ruler (view);
  76
  77     /* Find the first displayable changed byte */
  78     from = view->dpy_start;
  79     while (curr && (curr->offset < from)) {
  80         curr = curr->next;
  81     }
  82
  83     tty_setcolor (NORMAL_COLOR);
  84     for (row = 0, col = 0; row < height;) {
  85 #ifdef HAVE_CHARSET
  86         if (view->utf8) {
  87             if ((c = mcview_get_utf (view, from, &cw)) == -1)
  88                 break;
  89         } else
  90 #endif
  91         {
  92             if ((c = mcview_get_byte (view, from)) == -1)
  93                 break;
  94         }
  95         from++;
  96         mc_log ("cw=%i\n", cw);
  97         if (cw > 1)
  98             from += cw - 1;
  99
 100         if (view->text_nroff_mode && c == '\b') {
 101             int c_prev;
 102             int c_next;
 103
 104             if ((c_next = mcview_get_byte_indexed (view, from, 1)) != -1 && g_ascii_isprint (c_next)
 105                 && from >= 1
 106                 && (c_prev = mcview_get_byte (view, from - 1)) != -1 && g_ascii_isprint (c_prev)
 107                 && (c_prev == c_next || c_prev == '_' || (c_prev == '+' && c_next == 'o'))) {
 108                 if (col == 0) {
 109                     if (row == 0) {
 110                         /* We're inside an nroff character sequence at the
 111                          * beginning of the screen -- just skip the
 112                          * backspace and continue with the next character. */
 113                         continue;
 114                     }
 115                     row--;
 116                     col = width;
 117                 }
 118                 col--;
 119                 if (c_prev == '_' && (c_next != '_' || mcview_count_backspaces (view, from) == 1))
 120                     tty_setcolor (VIEW_UNDERLINED_COLOR);
 121                 else
 122                     tty_setcolor (MARKED_COLOR);
 123                 continue;
 124             }
 125         }
 126
 127         if ((c == '\n') || (col >= width && view->text_wrap_mode)) {
 128             col = 0;
 129             row++;
 130             if (c == '\n' || row >= height)
 131                 continue;
 132         }
 133
 134         if (c == '\r') {
 135             c = mcview_get_byte_indexed (view, from, 1);
 136             if (c == '\r' || c == '\n')
 137                 continue;
 138             col = 0;
 139             row++;
 140             continue;
 141         }
 142
 143         if (c == '\t') {
 144             off_t line, column;
 145             mcview_offset_to_coord (view, &line, &column, from);
 146             col += (8 - column % 8);
 147             if (view->text_wrap_mode && col >= width && width != 0) {
 148                 row += col / width;
 149                 col %= width;
 150             }
 151             continue;
 152         }
 153
 154         if (view->search_start <= from && from < view->search_end) {
 155             tty_setcolor (SELECTED_COLOR);
 156         }
 157
 158         if (col >= view->dpy_text_column && col - view->dpy_text_column < width) {
 159             widget_move (view, top + row, left + (col - view->dpy_text_column));
 160 #ifdef HAVE_CHARSET
 161             if (utf8_display) {
 162                 if (!view->utf8) {
 163                     c = convert_from_8bit_to_utf_c ((unsigned char) c, view->converter);
 164                 }
 165             } else {
 166                 if (view->utf8) {
 167                     c = convert_from_utf_to_current_c (c, view->converter);
 168                 } else {
 169 #endif
 170                     c = convert_to_display_c (c);
 171 #ifdef HAVE_CHARSET
 172                 }
 173             }
 174 #endif
 175             tty_print_anychar (c);
 176         }
 177         col++;
 178         tty_setcolor (NORMAL_COLOR);
 179     }
 180     view->dpy_end = from;
 181 }
 182
 183 /* --------------------------------------------------------------------------------------------- */