src/editor/editdraw.c

   1 /*
   2    Editor text drawing.
   3
   4    Copyright (C) 1996-2016
   5    Free Software Foundation, Inc.
   6
   7    Written by:
   8    Paul Sheer, 1996, 1997
   9    Andrew Borodin <aborodin@vmail.ru> 2012, 2013
  10    Slava Zanko <slavazanko@gmail.com>, 2013
  11
  12    This file is part of the Midnight Commander.
  13
  14    The Midnight Commander is free software: you can redistribute it
  15    and/or modify it under the terms of the GNU General Public License as
  16    published by the Free Software Foundation, either version 3 of the License,
  17    or (at your option) any later version.
  18
  19    The Midnight Commander is distributed in the hope that it will be useful,
  20    but WITHOUT ANY WARRANTY; without even the implied warranty of
  21    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  22    GNU General Public License for more details.
  23
  24    You should have received a copy of the GNU General Public License
  25    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  26  */
  27
  28 /** \file
  29  *  \brief Source: editor text drawing
  30  *  \author Paul Sheer
  31  *  \date 1996, 1997
  32  */
  33
  34 #include <config.h>
  35 #include <stdlib.h>
  36 #include <stdio.h>
  37 #include <stdarg.h>
  38 #include <sys/types.h>
  39 #include <unistd.h>
  40 #include <string.h>
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <sys/stat.h>
  44
  45 #include "lib/global.h"
  46 #include "lib/tty/tty.h"        /* tty_printf() */
  47 #include "lib/tty/key.h"        /* is_idle() */
  48 #include "lib/skin.h"
  49 #include "lib/strutil.h"        /* utf string functions */
  50 #include "lib/util.h"           /* is_printable() */
  51 #include "lib/widget.h"
  52 #ifdef HAVE_CHARSET
  53 #include "lib/charsets.h"
  54 #endif
  55
  56 #include "src/setup.h"          /* edit_tab_spacing */
  57
  58 #include "edit-impl.h"
  59 #include "editwidget.h"
  60
  61 /*** global variables ****************************************************************************/
  62
  63 /* Toggles statusbar draw style */
  64 int simple_statusbar = 0;
  65
  66 int visible_tabs = 1, visible_tws = 1;
  67
  68 /*** file scope macro definitions ****************************************************************/
  69
  70 #define MAX_LINE_LEN 1024
  71
  72 /* Text styles */
  73 #define MOD_ABNORMAL            (1 << 8)
  74 #define MOD_BOLD                (1 << 9)
  75 #define MOD_MARKED              (1 << 10)
  76 #define MOD_CURSOR              (1 << 11)
  77 #define MOD_WHITESPACE          (1 << 12)
  78
  79 #define edit_move(x,y) widget_move(edit, y, x);
  80
  81 #define key_pending(x) (!is_idle())
  82
  83 #define EDITOR_MINIMUM_TERMINAL_WIDTH 30
  84
  85 /*** file scope type declarations ****************************************************************/
  86
  87 typedef struct
  88 {
  89     unsigned int ch;
  90     unsigned int style;
  91 } line_s;
  92
  93 /*** file scope variables ************************************************************************/
  94
  95 /*** file scope functions ************************************************************************/
  96
  97 static inline void
  98 printwstr (const char *s, int len)
  99 {
 100     if (len > 0)
 101         tty_printf ("%-*.*s", len, len, s);
 102 }
 103
 104 /* --------------------------------------------------------------------------------------------- */
 105
 106 static inline void
 107 status_string (WEdit * edit, char *s, int w)
 108 {
 109     char byte_str[16];
 110
 111     /*
 112      * If we are at the end of file, print <EOF>,
 113      * otherwise print the current character as is (if printable),
 114      * as decimal and as hex.
 115      */
 116     if (edit->buffer.curs1 < edit->buffer.size)
 117     {
 118 #ifdef HAVE_CHARSET
 119         if (edit->utf8)
 120         {
 121             unsigned int cur_utf = 0;
 122             int char_length = 1;
 123
 124             cur_utf = edit_buffer_get_utf (&edit->buffer, edit->buffer.curs1, &char_length);
 125             if (char_length > 0)
 126             {
 127                 g_snprintf (byte_str, sizeof (byte_str), "%04u 0x%03X",
 128                             (unsigned) cur_utf, (unsigned) cur_utf);
 129             }
 130             else
 131             {
 132                 cur_utf = edit_buffer_get_current_byte (&edit->buffer);
 133                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 134                             (int) cur_utf, (unsigned) cur_utf);
 135             }
 136         }
 137         else
 138 #endif
 139         {
 140             unsigned char cur_byte = 0;
 141
 142             cur_byte = edit_buffer_get_current_byte (&edit->buffer);
 143             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 144                         (int) cur_byte, (unsigned) cur_byte);
 145         }
 146     }
 147     else
 148     {
 149         strcpy (byte_str, "<EOF>     ");
 150     }
 151
 152     /* The field lengths just prevent the status line from shortening too much */
 153     if (simple_statusbar)
 154         g_snprintf (s, w,
 155                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 156                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 157                     edit->modified ? 'M' : '-',
 158                     macro_index < 0 ? '-' : 'R',
 159                     edit->overwrite == 0 ? '-' : 'O',
 160                     edit->curs_col + edit->over_col,
 161                     edit->buffer.curs_line + 1,
 162                     edit->buffer.lines + 1, (long) edit->buffer.curs1, (long) edit->buffer.size,
 163                     byte_str,
 164 #ifdef HAVE_CHARSET
 165                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 166 #endif
 167                     "");
 168     else
 169         g_snprintf (s, w,
 170                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 171                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 172                     edit->modified ? 'M' : '-',
 173                     macro_index < 0 ? '-' : 'R',
 174                     edit->overwrite == 0 ? '-' : 'O',
 175                     edit->curs_col + edit->over_col,
 176                     edit->start_line + 1,
 177                     edit->curs_row,
 178                     edit->buffer.curs_line + 1,
 179                     edit->buffer.lines + 1, (long) edit->buffer.curs1, (long) edit->buffer.size,
 180                     byte_str,
 181 #ifdef HAVE_CHARSET
 182                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 183 #endif
 184                     "");
 185 }
 186
 187 /* --------------------------------------------------------------------------------------------- */
 188 /**
 189  * Draw the status line at the top of the screen for fullscreen editor window.
 190  *
 191  * @param edit  editor object
 192  * @param color color pair
 193  */
 194
 195 static inline void
 196 edit_status_fullscreen (WEdit * edit, int color)
 197 {
 198     Widget *h = WIDGET (WIDGET (edit)->owner);
 199     const int w = h->cols;
 200     const size_t status_size = w + 1;
 201     char *const status = g_malloc (status_size);
 202     int status_len;
 203     const char *fname = "";
 204     int fname_len;
 205     const int gap = 3;          /* between the filename and the status */
 206     const int right_gap = 5;    /* at the right end of the screen */
 207     const int preferred_fname_len = 16;
 208
 209     status_string (edit, status, status_size);
 210     status_len = (int) str_term_width1 (status);
 211
 212     if (edit->filename_vpath != NULL)
 213     {
 214         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 215
 216         if (!option_state_full_filename)
 217             fname = x_basename (fname);
 218     }
 219
 220     fname_len = str_term_width1 (fname);
 221     if (fname_len < preferred_fname_len)
 222         fname_len = preferred_fname_len;
 223
 224     if (fname_len + gap + status_len + right_gap >= w)
 225     {
 226         if (preferred_fname_len + gap + status_len + right_gap >= w)
 227             fname_len = preferred_fname_len;
 228         else
 229             fname_len = w - (gap + status_len + right_gap);
 230         fname = str_trunc (fname, fname_len);
 231     }
 232
 233     widget_move (h, 0, 0);
 234     tty_setcolor (color);
 235     printwstr (fname, fname_len + gap);
 236     printwstr (status, w - (fname_len + gap));
 237
 238     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 239     {
 240         int percent;
 241
 242         percent = edit_buffer_calc_percent (&edit->buffer, edit->buffer.curs1);
 243         widget_move (h, 0, w - 6 - 6);
 244         tty_printf (" %3d%%", percent);
 245     }
 246
 247     g_free (status);
 248 }
 249
 250 /* --------------------------------------------------------------------------------------------- */
 251 /**
 252  * Draw status line for editor window if window is not in fullscreen mode.
 253  *
 254  * @param edit editor object
 255  */
 256
 257 static inline void
 258 edit_status_window (WEdit * edit)
 259 {
 260     Widget *w = WIDGET (edit);
 261     int y, x;
 262     int cols = w->cols;
 263
 264     tty_setcolor (STATUSBAR_COLOR);
 265
 266     if (cols > 5)
 267     {
 268         const char *fname = N_("NoName");
 269
 270         if (edit->filename_vpath != NULL)
 271         {
 272             fname = vfs_path_get_last_path_str (edit->filename_vpath);
 273
 274             if (!option_state_full_filename)
 275                 fname = x_basename (fname);
 276         }
 277 #ifdef ENABLE_NLS
 278         else
 279             fname = _(fname);
 280 #endif
 281
 282         edit_move (2, 0);
 283         tty_printf ("[%s]", str_term_trim (fname, w->cols - 8 - 6));
 284     }
 285
 286     tty_getyx (&y, &x);
 287     x -= w->x;
 288     x += 4;
 289     if (x + 6 <= cols - 2 - 6)
 290     {
 291         edit_move (x, 0);
 292         tty_printf ("[%c%c%c%c]",
 293                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 294                     edit->modified ? 'M' : '-',
 295                     macro_index < 0 ? '-' : 'R', edit->overwrite == 0 ? '-' : 'O');
 296     }
 297
 298     if (cols > 30)
 299     {
 300         edit_move (2, w->lines - 1);
 301         tty_printf ("%3ld %5ld/%ld %6ld/%ld",
 302                     edit->curs_col + edit->over_col,
 303                     edit->buffer.curs_line + 1, edit->buffer.lines + 1, (long) edit->buffer.curs1,
 304                     (long) edit->buffer.size);
 305     }
 306
 307     /*
 308      * If we are at the end of file, print <EOF>,
 309      * otherwise print the current character as is (if printable),
 310      * as decimal and as hex.
 311      */
 312     if (cols > 46)
 313     {
 314         edit_move (32, w->lines - 1);
 315         if (edit->buffer.curs1 >= edit->buffer.size)
 316             tty_print_string ("[<EOF>       ]");
 317 #ifdef HAVE_CHARSET
 318         else if (edit->utf8)
 319         {
 320             unsigned int cur_utf;
 321             int char_length = 1;
 322
 323             cur_utf = edit_buffer_get_utf (&edit->buffer, edit->buffer.curs1, &char_length);
 324             if (char_length <= 0)
 325                 cur_utf = edit_buffer_get_current_byte (&edit->buffer);
 326             tty_printf ("[%05u 0x%04X]", cur_utf, cur_utf);
 327         }
 328 #endif
 329         else
 330         {
 331             unsigned char cur_byte;
 332
 333             cur_byte = edit_buffer_get_current_byte (&edit->buffer);
 334             tty_printf ("[%05u 0x%04X]", (unsigned int) cur_byte, (unsigned int) cur_byte);
 335         }
 336     }
 337 }
 338
 339 /* --------------------------------------------------------------------------------------------- */
 340 /**
 341  * Draw a frame around edit area.
 342  *
 343  * @param edit   editor object
 344  * @param color  color pair
 345  * @param active TRUE if editor object is focused
 346  */
 347
 348 static inline void
 349 edit_draw_frame (const WEdit * edit, int color, gboolean active)
 350 {
 351     const Widget *w = CONST_WIDGET (edit);
 352
 353     /* draw a frame around edit area */
 354     tty_setcolor (color);
 355     /* draw double frame for active window if skin supports that */
 356     tty_draw_box (w->y, w->x, w->lines, w->cols, !active);
 357     /* draw a drag marker */
 358     if (edit->drag_state == MCEDIT_DRAG_NONE)
 359     {
 360         tty_setcolor (EDITOR_FRAME_DRAG);
 361         widget_move (w, w->lines - 1, w->cols - 1);
 362         tty_print_alt_char (ACS_LRCORNER, TRUE);
 363     }
 364 }
 365
 366 /* --------------------------------------------------------------------------------------------- */
 367 /**
 368  * Draw a window control buttons.
 369  *
 370  * @param edit  editor object
 371  * @param color color pair
 372  */
 373
 374 static inline void
 375 edit_draw_window_icons (const WEdit * edit, int color)
 376 {
 377     const Widget *w = CONST_WIDGET (edit);
 378     char tmp[17];
 379
 380     tty_setcolor (color);
 381     if (edit->fullscreen)
 382         widget_move (w->owner, 0, WIDGET (w->owner)->cols - 6);
 383     else
 384         widget_move (w, 0, w->cols - 8);
 385     g_snprintf (tmp, sizeof (tmp), "[%s][%s]", edit_window_state_char, edit_window_close_char);
 386     tty_print_string (tmp);
 387 }
 388
 389 /* --------------------------------------------------------------------------------------------- */
 390
 391 static inline void
 392 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 393                  long end_col, line_s line[], char *status, int bookmarked)
 394 {
 395     Widget *w = WIDGET (edit);
 396
 397     line_s *p;
 398
 399     int x = start_col_real;
 400     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 401     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 402     int cols_to_skip = abs (x);
 403     int i;
 404     int wrap_start;
 405     int len;
 406
 407     if (!edit->fullscreen)
 408     {
 409         x1++;
 410         y++;
 411     }
 412
 413     tty_setcolor (EDITOR_NORMAL_COLOR);
 414     if (bookmarked != 0)
 415         tty_setcolor (bookmarked);
 416
 417     len = end_col + 1 - start_col;
 418     wrap_start = option_word_wrap_line_length + edit->start_col;
 419
 420     if (len > 0 && w->y + y >= 0)
 421     {
 422         if (!show_right_margin || wrap_start > end_col)
 423             tty_draw_hline (w->y + y, w->x + x1, ' ', len);
 424         else if (wrap_start < 0)
 425         {
 426             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 427             tty_draw_hline (w->y + y, w->x + x1, ' ', len);
 428         }
 429         else
 430         {
 431             if (wrap_start > 0)
 432                 tty_draw_hline (w->y + y, w->x + x1, ' ', wrap_start);
 433
 434             len -= wrap_start;
 435             if (len > 0)
 436             {
 437                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 438                 tty_draw_hline (w->y + y, w->x + x1 + wrap_start, ' ', len);
 439             }
 440         }
 441     }
 442
 443     if (option_line_state)
 444     {
 445         tty_setcolor (LINE_STATE_COLOR);
 446         for (i = 0; i < LINE_STATE_WIDTH; i++)
 447         {
 448             edit_move (x1 + i - option_line_state_width, y);
 449             if (status[i] == '\0')
 450                 status[i] = ' ';
 451             tty_print_char (status[i]);
 452         }
 453     }
 454
 455     edit_move (x1, y);
 456     i = 1;
 457     for (p = line; p->ch != 0; p++)
 458     {
 459         int style;
 460         unsigned int textchar;
 461         int color;
 462
 463         if (cols_to_skip != 0)
 464         {
 465             cols_to_skip--;
 466             continue;
 467         }
 468
 469         style = p->style & 0xFF00;
 470         textchar = p->ch;
 471         color = p->style >> 16;
 472
 473         if (style & MOD_ABNORMAL)
 474         {
 475             /* Non-printable - use black background */
 476             color = 0;
 477         }
 478
 479         if (style & MOD_WHITESPACE)
 480         {
 481             if (style & MOD_MARKED)
 482             {
 483                 textchar = ' ';
 484                 tty_setcolor (EDITOR_MARKED_COLOR);
 485             }
 486             else
 487                 tty_setcolor (EDITOR_WHITESPACE_COLOR);
 488         }
 489         else if (style & MOD_BOLD)
 490             tty_setcolor (EDITOR_BOLD_COLOR);
 491         else if (style & MOD_MARKED)
 492             tty_setcolor (EDITOR_MARKED_COLOR);
 493         else
 494             tty_lowlevel_setcolor (color);
 495
 496         if (show_right_margin)
 497         {
 498             if (i > option_word_wrap_line_length + edit->start_col)
 499                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 500             i++;
 501         }
 502
 503         tty_print_anychar (textchar);
 504     }
 505 }
 506
 507 /* --------------------------------------------------------------------------------------------- */
 508 /** b is a pointer to the beginning of the line */
 509
 510 static void
 511 edit_draw_this_line (WEdit * edit, off_t b, long row, long start_col, long end_col)
 512 {
 513     Widget *w = WIDGET (edit);
 514
 515     line_s line[MAX_LINE_LEN];
 516     line_s *p = line;
 517
 518     off_t m1 = 0, m2 = 0, q;
 519     int col, start_col_real;
 520     int color;
 521     int abn_style;
 522     int book_mark = 0;
 523     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 524
 525     if (row > w->lines - 1 - EDIT_TEXT_VERTICAL_OFFSET - 2 * (edit->fullscreen ? 0 : 1))
 526         return;
 527
 528     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 529         book_mark = BOOK_MARK_COLOR;
 530     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 531         book_mark = BOOK_MARK_FOUND_COLOR;
 532
 533     if (book_mark)
 534         abn_style = book_mark << 16;
 535     else
 536         abn_style = MOD_ABNORMAL;
 537
 538     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 539     if (!edit->fullscreen)
 540     {
 541         end_col--;
 542         if (w->x + w->cols <= WIDGET (w->owner)->cols)
 543             end_col--;
 544     }
 545
 546     color = edit_get_syntax_color (edit, b - 1);
 547     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 548     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 549
 550     if (option_line_state)
 551     {
 552         long cur_line;
 553
 554         cur_line = edit->start_line + row;
 555         if (cur_line <= edit->buffer.lines)
 556         {
 557             g_snprintf (line_stat, sizeof (line_stat), "%7ld ", cur_line + 1);
 558         }
 559         else
 560         {
 561             memset (line_stat, ' ', LINE_STATE_WIDTH);
 562             line_stat[LINE_STATE_WIDTH] = '\0';
 563         }
 564         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 565         {
 566             g_snprintf (line_stat, 2, "*");
 567         }
 568     }
 569
 570     if (col + 16 > -edit->start_col)
 571     {
 572         eval_marks (edit, &m1, &m2);
 573
 574         if (row <= edit->buffer.lines - edit->start_line)
 575         {
 576             off_t tws = 0;
 577             if (tty_use_colors () && visible_tws)
 578             {
 579                 unsigned int c;
 580
 581                 tws = edit_buffer_get_eol (&edit->buffer, b);
 582                 while (tws > b
 583                        && ((c = edit_buffer_get_byte (&edit->buffer, tws - 1)) == ' ' || c == '\t'))
 584                     tws--;
 585             }
 586
 587             while (col <= end_col - edit->start_col)
 588             {
 589                 int char_length = 1;
 590                 unsigned int c;
 591                 gboolean wide_width_char = FALSE;
 592                 gboolean control_char = FALSE;
 593
 594                 p->ch = 0;
 595                 p->style = 0;
 596                 if (q == edit->buffer.curs1)
 597                     p->style |= MOD_CURSOR;
 598                 if (q >= m1 && q < m2)
 599                 {
 600                     if (edit->column_highlight)
 601                     {
 602                         long x;
 603                         long c1, c2;
 604
 605                         x = (long) edit_move_forward3 (edit, b, 0, q);
 606                         c1 = MIN (edit->column1, edit->column2);
 607                         c2 = MAX (edit->column1, edit->column2);
 608                         if (x >= c1 && x < c2)
 609                             p->style |= MOD_MARKED;
 610                     }
 611                     else
 612                         p->style |= MOD_MARKED;
 613                 }
 614                 if (q == edit->bracket)
 615                     p->style |= MOD_BOLD;
 616                 if (q >= edit->found_start && q < (off_t) (edit->found_start + edit->found_len))
 617                     p->style |= MOD_BOLD;
 618
 619 #ifdef HAVE_CHARSET
 620                 if (edit->utf8)
 621                     c = edit_buffer_get_utf (&edit->buffer, q, &char_length);
 622                 else
 623 #endif
 624                     c = edit_buffer_get_byte (&edit->buffer, q);
 625
 626                 /* we don't use bg for mc - fg contains both */
 627                 if (book_mark)
 628                 {
 629                     p->style |= book_mark << 16;
 630                 }
 631                 else
 632                 {
 633                     color = edit_get_syntax_color (edit, q);
 634                     p->style |= color << 16;
 635                 }
 636                 switch (c)
 637                 {
 638                 case '\n':
 639                     col = end_col - edit->start_col + 1;        /* quit */
 640                     break;
 641                 case '\t':
 642                     {
 643                         int tab_over;
 644                         int i;
 645
 646                         i = TAB_SIZE - ((int) col % TAB_SIZE);
 647                         tab_over = (end_col - edit->start_col) - (col + i - 1);
 648                         if (tab_over < 0)
 649                             i += tab_over;
 650                         col += i;
 651                         if (tty_use_colors () &&
 652                             ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 653                         {
 654                             if (p->style & MOD_MARKED)
 655                                 c = p->style;
 656                             else if (book_mark)
 657                                 c |= book_mark << 16;
 658                             else
 659                                 c = p->style | MOD_WHITESPACE;
 660                             if (i > 2)
 661                             {
 662                                 p->ch = '<';
 663                                 p->style = c;
 664                                 p++;
 665                                 while (--i > 1)
 666                                 {
 667                                     p->ch = '-';
 668                                     p->style = c;
 669                                     p++;
 670                                 }
 671                                 p->ch = '>';
 672                                 p->style = c;
 673                                 p++;
 674                             }
 675                             else if (i > 1)
 676                             {
 677                                 p->ch = '<';
 678                                 p->style = c;
 679                                 p++;
 680                                 p->ch = '>';
 681                                 p->style = c;
 682                                 p++;
 683                             }
 684                             else
 685                             {
 686                                 p->ch = '>';
 687                                 p->style = c;
 688                                 p++;
 689                             }
 690                         }
 691                         else if (tty_use_colors () && visible_tws && q >= tws
 692                                  && enable_show_tabs_tws)
 693                         {
 694                             p->ch = '.';
 695                             p->style |= MOD_WHITESPACE;
 696                             c = p->style & ~MOD_CURSOR;
 697                             p++;
 698                             while (--i)
 699                             {
 700                                 p->ch = ' ';
 701                                 p->style = c;
 702                                 p++;
 703                             }
 704                         }
 705                         else
 706                         {
 707                             p->ch |= ' ';
 708                             c = p->style & ~MOD_CURSOR;
 709                             p++;
 710                             while (--i)
 711                             {
 712                                 p->ch = ' ';
 713                                 p->style = c;
 714                                 p++;
 715                             }
 716                         }
 717                     }
 718                     break;
 719                 case ' ':
 720                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 721                     {
 722                         p->ch = '.';
 723                         p->style |= MOD_WHITESPACE;
 724                         p++;
 725                         col++;
 726                         break;
 727                     }
 728                     /* fallthrough */
 729                 default:
 730 #ifdef HAVE_CHARSET
 731                     if (mc_global.utf8_display)
 732                     {
 733                         if (!edit->utf8)
 734                         {
 735                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 736                         }
 737                         else
 738                         {
 739                             if (g_unichar_iswide (c))
 740                             {
 741                                 wide_width_char = TRUE;
 742                                 col++;
 743                             }
 744                         }
 745                     }
 746                     else if (edit->utf8)
 747                         c = convert_from_utf_to_current_c (c, edit->converter);
 748                     else
 749                         c = convert_to_display_c (c);
 750 #endif
 751
 752                     /* Caret notation for control characters */
 753                     if (c < 32)
 754                     {
 755                         p->ch = '^';
 756                         p->style = abn_style;
 757                         p++;
 758                         p->ch = c + 0x40;
 759                         p->style = abn_style;
 760                         p++;
 761                         col += 2;
 762                         control_char = TRUE;
 763                         break;
 764                     }
 765                     if (c == 127)
 766                     {
 767                         p->ch = '^';
 768                         p->style = abn_style;
 769                         p++;
 770                         p->ch = '?';
 771                         p->style = abn_style;
 772                         p++;
 773                         col += 2;
 774                         control_char = TRUE;
 775                         break;
 776                     }
 777 #ifdef HAVE_CHARSET
 778                     if (edit->utf8)
 779                     {
 780                         if (g_unichar_isprint (c))
 781                             p->ch = c;
 782                         else
 783                         {
 784                             p->ch = '.';
 785                             p->style = abn_style;
 786                         }
 787                         p++;
 788                     }
 789                     else
 790 #endif
 791                     {
 792                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 793                             (!mc_global.utf8_display && is_printable (c)))
 794                         {
 795                             p->ch = c;
 796                             p++;
 797                         }
 798                         else
 799                         {
 800                             p->ch = '.';
 801                             p->style = abn_style;
 802                             p++;
 803                         }
 804                     }
 805                     col++;
 806                     break;
 807                 }               /* case */
 808
 809                 q++;
 810                 if (char_length > 1)
 811                     q += char_length - 1;
 812
 813                 if (col > (end_col - edit->start_col + 1))
 814                 {
 815                     if (wide_width_char)
 816                     {
 817                         p--;
 818                         break;
 819                     }
 820                     if (control_char)
 821                     {
 822                         p -= 2;
 823                         break;
 824                     }
 825                 }
 826             }
 827         }
 828     }
 829     else
 830     {
 831         start_col_real = start_col = 0;
 832     }
 833
 834     p->ch = 0;
 835
 836     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 837 }
 838
 839 /* --------------------------------------------------------------------------------------------- */
 840
 841 static inline void
 842 edit_draw_this_char (WEdit * edit, off_t curs, long row, long start_column, long end_column)
 843 {
 844     off_t b = edit_buffer_get_bol (&edit->buffer, curs);
 845
 846     edit_draw_this_line (edit, b, row, start_column, end_column);
 847 }
 848
 849 /* --------------------------------------------------------------------------------------------- */
 850 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 851
 852 static inline void
 853 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 854 {
 855     static long prev_curs_row = 0;
 856     static off_t prev_curs = 0;
 857
 858     Widget *w = WIDGET (edit);
 859     Widget *wh = WIDGET (w->owner);
 860
 861     int force = edit->force;
 862     int y1, x1, y2, x2;
 863
 864     int last_line;
 865     int last_column;
 866
 867     /* draw only visible region */
 868
 869     last_line = wh->y + wh->lines - 1;
 870
 871     y1 = w->y;
 872     if (y1 > last_line - 1 /* buttonbar */ )
 873         return;
 874
 875     last_column = wh->x + wh->cols - 1;
 876
 877     x1 = w->x;
 878     if (x1 > last_column)
 879         return;
 880
 881     y2 = w->y + w->lines - 1;
 882     if (y2 < wh->y + 1 /* menubar */ )
 883         return;
 884
 885     x2 = w->x + w->cols - 1;
 886     if (x2 < wh->x)
 887         return;
 888
 889     if ((force & REDRAW_IN_BOUNDS) == 0)
 890     {
 891         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 892         /* draw only visible region */
 893
 894         if (y2 <= last_line - 1 /* buttonbar */ )
 895             end_row = w->lines - 1;
 896         else if (y1 >= wh->y + 1 /* menubar */ )
 897             end_row = wh->lines - 1 - y1 - 1;
 898         else
 899             end_row = start_row + wh->lines - 1 - 1;
 900
 901         if (x2 <= last_column)
 902             end_column = w->cols - 1;
 903         else if (x1 >= wh->x)
 904             end_column = wh->cols - 1 - x1;
 905         else
 906             end_column = start_column + wh->cols - 1;
 907     }
 908
 909     /*
 910      * If the position of the page has not moved then we can draw the cursor
 911      * character only.  This will prevent line flicker when using arrow keys.
 912      */
 913     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 914     {
 915         long row = 0;
 916         long b;
 917
 918         if ((force & REDRAW_PAGE) != 0)
 919         {
 920             row = start_row;
 921             b = edit_buffer_get_forward_offset (&edit->buffer, edit->start_display, start_row, 0);
 922             while (row <= end_row)
 923             {
 924                 if (key_pending (edit))
 925                     return;
 926                 edit_draw_this_line (edit, b, row, start_column, end_column);
 927                 b = edit_buffer_get_forward_offset (&edit->buffer, b, 1, 0);
 928                 row++;
 929             }
 930         }
 931         else
 932         {
 933             long curs_row = edit->curs_row;
 934
 935             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 936             {
 937                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 938
 939                 row = start_row;
 940                 b = edit->start_display;
 941                 while (row <= upto)
 942                 {
 943                     if (key_pending (edit))
 944                         return;
 945                     edit_draw_this_line (edit, b, row, start_column, end_column);
 946                     b = edit_buffer_get_forward_offset (&edit->buffer, b, 1, 0);
 947                 }
 948             }
 949
 950             /*          if (force & REDRAW_LINE)          ---> default */
 951             b = edit_buffer_get_current_bol (&edit->buffer);
 952             if (curs_row >= start_row && curs_row <= end_row)
 953             {
 954                 if (key_pending (edit))
 955                     return;
 956                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 957             }
 958
 959             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 960             {
 961                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 962                 b = edit_buffer_get_forward_offset (&edit->buffer, b, 1, 0);
 963                 while (row <= end_row)
 964                 {
 965                     if (key_pending (edit))
 966                         return;
 967                     edit_draw_this_line (edit, b, row, start_column, end_column);
 968                     b = edit_buffer_get_forward_offset (&edit->buffer, b, 1, 0);
 969                     row++;
 970                 }
 971             }
 972
 973             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 974             {
 975                 row = curs_row - 1;
 976                 b = edit_buffer_get_backward_offset (&edit->buffer,
 977                                                      edit_buffer_get_current_bol (&edit->buffer),
 978                                                      1);
 979                 if (row >= start_row && row <= end_row)
 980                 {
 981                     if (key_pending (edit))
 982                         return;
 983                     edit_draw_this_line (edit, b, row, start_column, end_column);
 984                 }
 985             }
 986
 987             if ((force & REDRAW_LINE_BELOW) != 0 && row < w->lines - 1)
 988             {
 989                 row = curs_row + 1;
 990                 b = edit_buffer_get_current_bol (&edit->buffer);
 991                 b = edit_buffer_get_forward_offset (&edit->buffer, b, 1, 0);
 992                 if (row >= start_row && row <= end_row)
 993                 {
 994                     if (key_pending (edit))
 995                         return;
 996                     edit_draw_this_line (edit, b, row, start_column, end_column);
 997                 }
 998             }
 999         }
1000     }
1001     else if (prev_curs_row < edit->curs_row)
1002     {
1003         /* with the new text highlighting, we must draw from the top down */
1004         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
1005         edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
1006     }
1007     else
1008     {
1009         edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
1010         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
1011     }
1012
1013     edit->force = 0;
1014
1015     prev_curs_row = edit->curs_row;
1016     prev_curs = edit->buffer.curs1;
1017 }
1018
1019 /* --------------------------------------------------------------------------------------------- */
1020
1021 static inline void
1022 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
1023 {
1024     if (page)                   /* if it was an expose event, 'page' would be set */
1025         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
1026
1027     render_edit_text (edit, row_start, col_start, row_end, col_end);
1028
1029     /*
1030      * edit->force != 0 means a key was pending and the redraw
1031      * was halted, so next time we must redraw everything in case stuff
1032      * was left undrawn from a previous key press.
1033      */
1034     if (edit->force)
1035         edit->force |= REDRAW_PAGE;
1036 }
1037
1038 /* --------------------------------------------------------------------------------------------- */
1039 /*** public functions ****************************************************************************/
1040 /* --------------------------------------------------------------------------------------------- */
1041
1042 void
1043 edit_status (WEdit * edit, gboolean active)
1044 {
1045     int color;
1046
1047     if (edit->fullscreen)
1048     {
1049         color = STATUSBAR_COLOR;
1050         edit_status_fullscreen (edit, color);
1051     }
1052     else
1053     {
1054         color = edit->drag_state != MCEDIT_DRAG_NONE ? EDITOR_FRAME_DRAG : active ?
1055             EDITOR_FRAME_ACTIVE : EDITOR_FRAME;
1056         edit_draw_frame (edit, color, active);
1057         edit_status_window (edit);
1058     }
1059
1060     edit_draw_window_icons (edit, color);
1061 }
1062
1063 /* --------------------------------------------------------------------------------------------- */
1064
1065 /** this scrolls the text so that cursor is on the screen */
1066 void
1067 edit_scroll_screen_over_cursor (WEdit * edit)
1068 {
1069     Widget *w = WIDGET (edit);
1070
1071     long p;
1072     long outby;
1073     int b_extreme, t_extreme, l_extreme, r_extreme;
1074
1075     if (w->lines <= 0 || w->cols <= 0)
1076         return;
1077
1078     w->lines -= EDIT_TEXT_VERTICAL_OFFSET;
1079     w->cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
1080
1081     if (!edit->fullscreen)
1082     {
1083         w->x++;
1084         w->cols -= 2;
1085         w->y++;
1086         w->lines -= 2;
1087     }
1088
1089     r_extreme = EDIT_RIGHT_EXTREME;
1090     l_extreme = EDIT_LEFT_EXTREME;
1091     b_extreme = EDIT_BOTTOM_EXTREME;
1092     t_extreme = EDIT_TOP_EXTREME;
1093     if (edit->found_len != 0)
1094     {
1095         b_extreme = MAX (w->lines / 4, b_extreme);
1096         t_extreme = MAX (w->lines / 4, t_extreme);
1097     }
1098     if (b_extreme + t_extreme + 1 > w->lines)
1099     {
1100         int n;
1101
1102         n = b_extreme + t_extreme;
1103         if (n == 0)
1104             n = 1;
1105         b_extreme = (b_extreme * (w->lines - 1)) / n;
1106         t_extreme = (t_extreme * (w->lines - 1)) / n;
1107     }
1108     if (l_extreme + r_extreme + 1 > w->cols)
1109     {
1110         int n;
1111
1112         n = l_extreme + t_extreme;
1113         if (n == 0)
1114             n = 1;
1115         l_extreme = (l_extreme * (w->cols - 1)) / n;
1116         r_extreme = (r_extreme * (w->cols - 1)) / n;
1117     }
1118     p = edit_get_col (edit) + edit->over_col;
1119     edit_update_curs_row (edit);
1120     outby = p + edit->start_col - w->cols + 1 + (r_extreme + edit->found_len);
1121     if (outby > 0)
1122         edit_scroll_right (edit, outby);
1123     outby = l_extreme - p - edit->start_col;
1124     if (outby > 0)
1125         edit_scroll_left (edit, outby);
1126     p = edit->curs_row;
1127     outby = p - w->lines + 1 + b_extreme;
1128     if (outby > 0)
1129         edit_scroll_downward (edit, outby);
1130     outby = t_extreme - p;
1131     if (outby > 0)
1132         edit_scroll_upward (edit, outby);
1133     edit_update_curs_row (edit);
1134
1135     w->lines += EDIT_TEXT_VERTICAL_OFFSET;
1136     w->cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
1137     if (!edit->fullscreen)
1138     {
1139         w->x--;
1140         w->cols += 2;
1141         w->y--;
1142         w->lines += 2;
1143     }
1144 }
1145
1146 /* --------------------------------------------------------------------------------------------- */
1147
1148 void
1149 edit_render_keypress (WEdit * edit)
1150 {
1151     edit_render (edit, 0, 0, 0, 0, 0);
1152 }
1153
1154 /* --------------------------------------------------------------------------------------------- */