src/editor/editdraw.c

   1 /*
   2    Editor text drawing.
   3
   4    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   5    2007, 2011, 2012, 2013
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Paul Sheer, 1996, 1997
  10    Andrew Borodin <aborodin@vmail.ru> 2012, 2013
  11    Slava Zanko <slavazanko@gmail.com>, 2013
  12
  13    This file is part of the Midnight Commander.
  14
  15    The Midnight Commander is free software: you can redistribute it
  16    and/or modify it under the terms of the GNU General Public License as
  17    published by the Free Software Foundation, either version 3 of the License,
  18    or (at your option) any later version.
  19
  20    The Midnight Commander is distributed in the hope that it will be useful,
  21    but WITHOUT ANY WARRANTY; without even the implied warranty of
  22    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23    GNU General Public License for more details.
  24
  25    You should have received a copy of the GNU General Public License
  26    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  27  */
  28
  29 /** \file
  30  *  \brief Source: editor text drawing
  31  *  \author Paul Sheer
  32  *  \date 1996, 1997
  33  */
  34
  35 #include <config.h>
  36 #include <stdlib.h>
  37 #include <stdio.h>
  38 #include <stdarg.h>
  39 #include <sys/types.h>
  40 #include <unistd.h>
  41 #include <string.h>
  42 #include <ctype.h>
  43 #include <errno.h>
  44 #include <sys/stat.h>
  45
  46 #include "lib/global.h"
  47 #include "lib/tty/tty.h"        /* tty_printf() */
  48 #include "lib/tty/key.h"        /* is_idle() */
  49 #include "lib/skin.h"
  50 #include "lib/strutil.h"        /* utf string functions */
  51 #include "lib/util.h"           /* is_printable() */
  52 #include "lib/widget.h"
  53 #ifdef HAVE_CHARSET
  54 #include "lib/charsets.h"
  55 #endif
  56
  57 #include "src/setup.h"          /* edit_tab_spacing */
  58
  59 #include "edit-impl.h"
  60 #include "editwidget.h"
  61
  62 /*** global variables ****************************************************************************/
  63
  64 /* Toggles statusbar draw style */
  65 int simple_statusbar = 0;
  66
  67 int visible_tabs = 1, visible_tws = 1;
  68
  69 /*** file scope macro definitions ****************************************************************/
  70
  71 #define MAX_LINE_LEN 1024
  72
  73 /* Text styles */
  74 #define MOD_ABNORMAL            (1 << 8)
  75 #define MOD_BOLD                (1 << 9)
  76 #define MOD_MARKED              (1 << 10)
  77 #define MOD_CURSOR              (1 << 11)
  78 #define MOD_WHITESPACE          (1 << 12)
  79
  80 #define edit_move(x,y) widget_move(edit, y, x);
  81
  82 #define key_pending(x) (!is_idle())
  83
  84 #define EDITOR_MINIMUM_TERMINAL_WIDTH 30
  85
  86 /*** file scope type declarations ****************************************************************/
  87
  88 struct line_s
  89 {
  90     unsigned int ch;
  91     unsigned int style;
  92 };
  93
  94 /*** file scope variables ************************************************************************/
  95
  96 /*** file scope functions ************************************************************************/
  97
  98 static inline void
  99 printwstr (const char *s, int len)
 100 {
 101     if (len > 0)
 102         tty_printf ("%-*.*s", len, len, s);
 103 }
 104
 105 /* --------------------------------------------------------------------------------------------- */
 106
 107 static inline void
 108 status_string (WEdit * edit, char *s, int w)
 109 {
 110     char byte_str[16];
 111
 112     /*
 113      * If we are at the end of file, print <EOF>,
 114      * otherwise print the current character as is (if printable),
 115      * as decimal and as hex.
 116      */
 117     if (edit->buffer.curs1 < edit->buffer.size)
 118     {
 119 #ifdef HAVE_CHARSET
 120         if (edit->utf8)
 121         {
 122             unsigned int cur_utf = 0;
 123             int cw = 1;
 124
 125             cur_utf = edit_buffer_get_utf (&edit->buffer, edit->buffer.curs1, &cw);
 126             if (cw > 0)
 127             {
 128                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 129                             (unsigned) cur_utf, (unsigned) cur_utf);
 130             }
 131             else
 132             {
 133                 cur_utf = edit_buffer_get_current_byte (&edit->buffer);
 134                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 135                             (int) cur_utf, (unsigned) cur_utf);
 136             }
 137         }
 138         else
 139 #endif
 140         {
 141             unsigned char cur_byte = 0;
 142
 143             cur_byte = edit_buffer_get_current_byte (&edit->buffer);
 144             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 145                         (int) cur_byte, (unsigned) cur_byte);
 146         }
 147     }
 148     else
 149     {
 150         strcpy (byte_str, "<EOF>     ");
 151     }
 152
 153     /* The field lengths just prevent the status line from shortening too much */
 154     if (simple_statusbar)
 155         g_snprintf (s, w,
 156                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 157                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 158                     edit->modified ? 'M' : '-',
 159                     macro_index < 0 ? '-' : 'R',
 160                     edit->overwrite == 0 ? '-' : 'O',
 161                     edit->curs_col + edit->over_col,
 162                     edit->buffer.curs_line + 1,
 163                     edit->buffer.lines + 1, (long) edit->buffer.curs1, (long) edit->buffer.size,
 164                     byte_str,
 165 #ifdef HAVE_CHARSET
 166                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 167 #endif
 168                     "");
 169     else
 170         g_snprintf (s, w,
 171                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 172                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 173                     edit->modified ? 'M' : '-',
 174                     macro_index < 0 ? '-' : 'R',
 175                     edit->overwrite == 0 ? '-' : 'O',
 176                     edit->curs_col + edit->over_col,
 177                     edit->start_line + 1,
 178                     edit->curs_row,
 179                     edit->buffer.curs_line + 1,
 180                     edit->buffer.lines + 1, (long) edit->buffer.curs1, (long) edit->buffer.size,
 181                     byte_str,
 182 #ifdef HAVE_CHARSET
 183                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 184 #endif
 185                     "");
 186 }
 187
 188 /* --------------------------------------------------------------------------------------------- */
 189 /**
 190  * Draw the status line at the top of the screen for fullscreen editor window.
 191  *
 192  * @param edit  editor object
 193  * @param color color pair
 194  */
 195
 196 static inline void
 197 edit_status_fullscreen (WEdit * edit, int color)
 198 {
 199     Widget *h = WIDGET (WIDGET (edit)->owner);
 200     const int w = h->cols;
 201     const size_t status_size = w + 1;
 202     char *const status = g_malloc (status_size);
 203     int status_len;
 204     const char *fname = "";
 205     int fname_len;
 206     const int gap = 3;          /* between the filename and the status */
 207     const int right_gap = 5;    /* at the right end of the screen */
 208     const int preferred_fname_len = 16;
 209
 210     status_string (edit, status, status_size);
 211     status_len = (int) str_term_width1 (status);
 212
 213     if (edit->filename_vpath != NULL)
 214         fname = x_basename (vfs_path_get_last_path_str (edit->filename_vpath));
 215
 216     fname_len = str_term_width1 (fname);
 217     if (fname_len < preferred_fname_len)
 218         fname_len = preferred_fname_len;
 219
 220     if (fname_len + gap + status_len + right_gap >= w)
 221     {
 222         if (preferred_fname_len + gap + status_len + right_gap >= w)
 223             fname_len = preferred_fname_len;
 224         else
 225             fname_len = w - (gap + status_len + right_gap);
 226         fname = str_trunc (fname, fname_len);
 227     }
 228
 229     widget_move (h, 0, 0);
 230     tty_setcolor (color);
 231     printwstr (fname, fname_len + gap);
 232     printwstr (status, w - (fname_len + gap));
 233
 234     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 235     {
 236         size_t percent = 100;
 237
 238         if (edit->buffer.lines + 1 != 0)
 239             percent = (edit->buffer.curs_line + 1) * 100 / (edit->buffer.lines + 1);
 240         widget_move (h, 0, w - 6 - 6);
 241         tty_printf (" %3d%%", percent);
 242     }
 243
 244     g_free (status);
 245 }
 246
 247 /* --------------------------------------------------------------------------------------------- */
 248 /**
 249  * Draw status line for editor window if window is not in fullscreen mode.
 250  *
 251  * @param edit editor object
 252  */
 253
 254 static inline void
 255 edit_status_window (WEdit * edit)
 256 {
 257     Widget *w = WIDGET (edit);
 258     int y, x;
 259     int cols = w->cols;
 260
 261     tty_setcolor (STATUSBAR_COLOR);
 262
 263     if (cols > 5)
 264     {
 265         const char *fname = N_("NoName");
 266
 267         if (edit->filename_vpath != NULL)
 268         {
 269             fname = x_basename (vfs_path_as_str (edit->filename_vpath));
 270         }
 271 #ifdef ENABLE_NLS
 272         else
 273             fname = _(fname);
 274 #endif
 275
 276         edit_move (2, 0);
 277         tty_printf ("[%s]", str_term_trim (fname, w->cols - 8 - 6));
 278     }
 279
 280     tty_getyx (&y, &x);
 281     x -= w->x;
 282     x += 4;
 283     if (x + 6 <= cols - 2 - 6)
 284     {
 285         edit_move (x, 0);
 286         tty_printf ("[%c%c%c%c]",
 287                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 288                     edit->modified ? 'M' : '-',
 289                     macro_index < 0 ? '-' : 'R', edit->overwrite == 0 ? '-' : 'O');
 290     }
 291
 292     if (cols > 30)
 293     {
 294         edit_move (2, w->lines - 1);
 295         tty_printf ("%3ld %5ld/%ld %6ld/%ld",
 296                     edit->curs_col + edit->over_col,
 297                     edit->buffer.curs_line + 1, edit->buffer.lines + 1, (long) edit->buffer.curs1,
 298                     (long) edit->buffer.size);
 299     }
 300
 301     /*
 302      * If we are at the end of file, print <EOF>,
 303      * otherwise print the current character as is (if printable),
 304      * as decimal and as hex.
 305      */
 306     if (cols > 46)
 307     {
 308         edit_move (32, w->lines - 1);
 309         if (edit->buffer.curs1 >= edit->buffer.size)
 310             tty_print_string ("[<EOF>       ]");
 311 #ifdef HAVE_CHARSET
 312         else if (edit->utf8)
 313         {
 314             unsigned int cur_utf;
 315             int cw = 1;
 316
 317             cur_utf = edit_buffer_get_utf (&edit->buffer, edit->buffer.curs1, &cw);
 318             if (cw <= 0)
 319                 cur_utf = edit_buffer_get_current_byte (&edit->buffer);
 320             tty_printf ("[%05d 0x%04X]", cur_utf, cur_utf);
 321         }
 322 #endif
 323         else
 324         {
 325             unsigned char cur_byte;
 326
 327             cur_byte = edit_buffer_get_current_byte (&edit->buffer);
 328             tty_printf ("[%05d 0x%04X]", (unsigned int) cur_byte, (unsigned int) cur_byte);
 329         }
 330     }
 331 }
 332
 333 /* --------------------------------------------------------------------------------------------- */
 334 /**
 335  * Draw a frame around edit area.
 336  *
 337  * @param edit   editor object
 338  * @param color  color pair
 339  * @param active TRUE if editor object is focused
 340  */
 341
 342 static inline void
 343 edit_draw_frame (const WEdit * edit, int color, gboolean active)
 344 {
 345     const Widget *w = (const Widget *) edit;
 346
 347     /* draw a frame around edit area */
 348     tty_setcolor (color);
 349     /* draw double frame for active window if skin supports that */
 350     tty_draw_box (w->y, w->x, w->lines, w->cols, !active);
 351     /* draw a drag marker */
 352     if (edit->drag_state == MCEDIT_DRAG_NORMAL)
 353     {
 354         tty_setcolor (EDITOR_FRAME_DRAG);
 355         widget_move (w, w->lines - 1, w->cols - 1);
 356         tty_print_alt_char (ACS_LRCORNER, TRUE);
 357     }
 358 }
 359
 360 /* --------------------------------------------------------------------------------------------- */
 361 /**
 362  * Draw a window control buttons.
 363  *
 364  * @param edit  editor object
 365  * @param color color pair
 366  */
 367
 368 static inline void
 369 edit_draw_window_icons (const WEdit * edit, int color)
 370 {
 371     const Widget *w = WIDGET (edit);
 372     char tmp[17];
 373
 374     tty_setcolor (color);
 375     if (edit->fullscreen)
 376         widget_move (w->owner, 0, WIDGET (w->owner)->cols - 6);
 377     else
 378         widget_move (w, 0, w->cols - 8);
 379     g_snprintf (tmp, sizeof (tmp), "[%s][%s]", edit_window_state_char, edit_window_close_char);
 380     tty_print_string (tmp);
 381 }
 382
 383 /* --------------------------------------------------------------------------------------------- */
 384
 385 static inline void
 386 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 387                  long end_col, struct line_s line[], char *status, int bookmarked)
 388 {
 389     Widget *w = WIDGET (edit);
 390
 391     struct line_s *p;
 392
 393     int x = start_col_real;
 394     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 395     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 396     int cols_to_skip = abs (x);
 397     int i;
 398     int wrap_start;
 399     int len;
 400
 401     if (!edit->fullscreen)
 402     {
 403         x1++;
 404         y++;
 405     }
 406
 407     tty_setcolor (EDITOR_NORMAL_COLOR);
 408     if (bookmarked != 0)
 409         tty_setcolor (bookmarked);
 410
 411     len = end_col + 1 - start_col;
 412     wrap_start = option_word_wrap_line_length + edit->start_col;
 413
 414     if (len > 0 && w->y + y >= 0)
 415     {
 416         if (!show_right_margin || wrap_start > end_col)
 417             tty_draw_hline (w->y + y, w->x + x1, ' ', len);
 418         else if (wrap_start < 0)
 419         {
 420             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 421             tty_draw_hline (w->y + y, w->x + x1, ' ', len);
 422         }
 423         else
 424         {
 425             if (wrap_start > 0)
 426                 tty_draw_hline (w->y + y, w->x + x1, ' ', wrap_start);
 427
 428             len -= wrap_start;
 429             if (len > 0)
 430             {
 431                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 432                 tty_draw_hline (w->y + y, w->x + x1 + wrap_start, ' ', len);
 433             }
 434         }
 435     }
 436
 437     if (option_line_state)
 438     {
 439         tty_setcolor (LINE_STATE_COLOR);
 440         for (i = 0; i < LINE_STATE_WIDTH; i++)
 441         {
 442             edit_move (x1 + i - option_line_state_width, y);
 443             if (status[i] == '\0')
 444                 status[i] = ' ';
 445             tty_print_char (status[i]);
 446         }
 447     }
 448
 449     edit_move (x1, y);
 450     i = 1;
 451     for (p = line; p->ch != 0; p++)
 452     {
 453         int style;
 454         unsigned int textchar;
 455         int color;
 456
 457         if (cols_to_skip != 0)
 458         {
 459             cols_to_skip--;
 460             continue;
 461         }
 462
 463         style = p->style & 0xFF00;
 464         textchar = p->ch;
 465         color = p->style >> 16;
 466
 467         if (style & MOD_ABNORMAL)
 468         {
 469             /* Non-printable - use black background */
 470             color = 0;
 471         }
 472
 473         if (style & MOD_WHITESPACE)
 474         {
 475             if (style & MOD_MARKED)
 476             {
 477                 textchar = ' ';
 478                 tty_setcolor (EDITOR_MARKED_COLOR);
 479             }
 480             else
 481                 tty_setcolor (EDITOR_WHITESPACE_COLOR);
 482         }
 483         else if (style & MOD_BOLD)
 484             tty_setcolor (EDITOR_BOLD_COLOR);
 485         else if (style & MOD_MARKED)
 486             tty_setcolor (EDITOR_MARKED_COLOR);
 487         else
 488             tty_lowlevel_setcolor (color);
 489
 490         if (show_right_margin)
 491         {
 492             if (i > option_word_wrap_line_length + edit->start_col)
 493                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 494             i++;
 495         }
 496
 497         tty_print_anychar (textchar);
 498     }
 499 }
 500
 501 /* --------------------------------------------------------------------------------------------- */
 502 /** b is a pointer to the beginning of the line */
 503
 504 static void
 505 edit_draw_this_line (WEdit * edit, off_t b, long row, long start_col, long end_col)
 506 {
 507     Widget *w = WIDGET (edit);
 508
 509     struct line_s line[MAX_LINE_LEN];
 510     struct line_s *p = line;
 511
 512     off_t m1 = 0, m2 = 0, q;
 513     int col, start_col_real;
 514     int color;
 515     int abn_style;
 516     int book_mark = 0;
 517     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 518
 519     if (row > w->lines - 1 - EDIT_TEXT_VERTICAL_OFFSET - 2 * (edit->fullscreen ? 0 : 1))
 520         return;
 521
 522     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 523         book_mark = BOOK_MARK_COLOR;
 524     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 525         book_mark = BOOK_MARK_FOUND_COLOR;
 526
 527     if (book_mark)
 528         abn_style = book_mark << 16;
 529     else
 530         abn_style = MOD_ABNORMAL;
 531
 532     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 533     if (!edit->fullscreen)
 534     {
 535         end_col--;
 536         if (w->x + w->cols <= WIDGET (w->owner)->cols)
 537             end_col--;
 538     }
 539
 540     color = edit_get_syntax_color (edit, b - 1);
 541     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 542     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 543
 544     if (option_line_state)
 545     {
 546         unsigned int cur_line;
 547
 548         cur_line = edit->start_line + row;
 549         if (cur_line <= (unsigned int) edit->buffer.lines)
 550         {
 551             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 552         }
 553         else
 554         {
 555             memset (line_stat, ' ', LINE_STATE_WIDTH);
 556             line_stat[LINE_STATE_WIDTH] = '\0';
 557         }
 558         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 559         {
 560             g_snprintf (line_stat, 2, "*");
 561         }
 562     }
 563
 564     if (col + 16 > -edit->start_col)
 565     {
 566         eval_marks (edit, &m1, &m2);
 567
 568         if (row <= edit->buffer.lines - edit->start_line)
 569         {
 570             off_t tws = 0;
 571             if (tty_use_colors () && visible_tws)
 572             {
 573                 unsigned int c;
 574
 575                 tws = edit_buffer_get_eol (&edit->buffer, b);
 576                 while (tws > b
 577                        && ((c = edit_buffer_get_byte (&edit->buffer, tws - 1)) == ' ' || c == '\t'))
 578                     tws--;
 579             }
 580
 581             while (col <= end_col - edit->start_col)
 582             {
 583                 int cw = 1;
 584                 unsigned int c;
 585                 gboolean wide_width_char = FALSE;
 586                 gboolean control_char = FALSE;
 587
 588                 p->ch = 0;
 589                 p->style = 0;
 590                 if (q == edit->buffer.curs1)
 591                     p->style |= MOD_CURSOR;
 592                 if (q >= m1 && q < m2)
 593                 {
 594                     if (edit->column_highlight)
 595                     {
 596                         long x;
 597                         long c1, c2;
 598
 599                         x = (long) edit_move_forward3 (edit, b, 0, q);
 600                         c1 = min (edit->column1, edit->column2);
 601                         c2 = max (edit->column1, edit->column2);
 602                         if (x >= c1 && x < c2)
 603                             p->style |= MOD_MARKED;
 604                     }
 605                     else
 606                         p->style |= MOD_MARKED;
 607                 }
 608                 if (q == edit->bracket)
 609                     p->style |= MOD_BOLD;
 610                 if (q >= edit->found_start && q < (off_t) (edit->found_start + edit->found_len))
 611                     p->style |= MOD_BOLD;
 612
 613 #ifdef HAVE_CHARSET
 614                 if (edit->utf8)
 615                     c = edit_buffer_get_utf (&edit->buffer, q, &cw);
 616                 else
 617 #endif
 618                     c = edit_buffer_get_byte (&edit->buffer, q);
 619
 620                 /* we don't use bg for mc - fg contains both */
 621                 if (book_mark)
 622                 {
 623                     p->style |= book_mark << 16;
 624                 }
 625                 else
 626                 {
 627                     color = edit_get_syntax_color (edit, q);
 628                     p->style |= color << 16;
 629                 }
 630                 switch (c)
 631                 {
 632                 case '\n':
 633                     col = end_col - edit->start_col + 1;        /* quit */
 634                     break;
 635                 case '\t':
 636                     {
 637                         int tab_over;
 638                         int i;
 639
 640                         i = TAB_SIZE - ((int) col % TAB_SIZE);
 641                         tab_over = (end_col - edit->start_col) - (col + i - 1);
 642                         if (tab_over < 0)
 643                             i += tab_over;
 644                         col += i;
 645                         if (tty_use_colors () &&
 646                             ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 647                         {
 648                             if (p->style & MOD_MARKED)
 649                                 c = p->style;
 650                             else if (book_mark)
 651                                 c |= book_mark << 16;
 652                             else
 653                                 c = p->style | MOD_WHITESPACE;
 654                             if (i > 2)
 655                             {
 656                                 p->ch = '<';
 657                                 p->style = c;
 658                                 p++;
 659                                 while (--i > 1)
 660                                 {
 661                                     p->ch = '-';
 662                                     p->style = c;
 663                                     p++;
 664                                 }
 665                                 p->ch = '>';
 666                                 p->style = c;
 667                                 p++;
 668                             }
 669                             else if (i > 1)
 670                             {
 671                                 p->ch = '<';
 672                                 p->style = c;
 673                                 p++;
 674                                 p->ch = '>';
 675                                 p->style = c;
 676                                 p++;
 677                             }
 678                             else
 679                             {
 680                                 p->ch = '>';
 681                                 p->style = c;
 682                                 p++;
 683                             }
 684                         }
 685                         else if (tty_use_colors () && visible_tws && q >= tws
 686                                  && enable_show_tabs_tws)
 687                         {
 688                             p->ch = '.';
 689                             p->style |= MOD_WHITESPACE;
 690                             c = p->style & ~MOD_CURSOR;
 691                             p++;
 692                             while (--i)
 693                             {
 694                                 p->ch = ' ';
 695                                 p->style = c;
 696                                 p++;
 697                             }
 698                         }
 699                         else
 700                         {
 701                             p->ch |= ' ';
 702                             c = p->style & ~MOD_CURSOR;
 703                             p++;
 704                             while (--i)
 705                             {
 706                                 p->ch = ' ';
 707                                 p->style = c;
 708                                 p++;
 709                             }
 710                         }
 711                     }
 712                     break;
 713                 case ' ':
 714                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 715                     {
 716                         p->ch = '.';
 717                         p->style |= MOD_WHITESPACE;
 718                         p++;
 719                         col++;
 720                         break;
 721                     }
 722                     /* fallthrough */
 723                 default:
 724 #ifdef HAVE_CHARSET
 725                     if (mc_global.utf8_display)
 726                     {
 727                         if (!edit->utf8)
 728                         {
 729                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 730                         }
 731                         else
 732                         {
 733                             if (g_unichar_iswide (c))
 734                             {
 735                                 wide_width_char = TRUE;
 736                                 col++;
 737                             }
 738                         }
 739                     }
 740                     else if (edit->utf8)
 741                         c = convert_from_utf_to_current_c (c, edit->converter);
 742                     else
 743                         c = convert_to_display_c (c);
 744 #endif
 745
 746                     /* Caret notation for control characters */
 747                     if (c < 32)
 748                     {
 749                         p->ch = '^';
 750                         p->style = abn_style;
 751                         p++;
 752                         p->ch = c + 0x40;
 753                         p->style = abn_style;
 754                         p++;
 755                         col += 2;
 756                         control_char = TRUE;
 757                         break;
 758                     }
 759                     if (c == 127)
 760                     {
 761                         p->ch = '^';
 762                         p->style = abn_style;
 763                         p++;
 764                         p->ch = '?';
 765                         p->style = abn_style;
 766                         p++;
 767                         col += 2;
 768                         control_char = TRUE;
 769                         break;
 770                     }
 771 #ifdef HAVE_CHARSET
 772                     if (edit->utf8)
 773                     {
 774                         if (g_unichar_isprint (c))
 775                             p->ch = c;
 776                         else
 777                         {
 778                             p->ch = '.';
 779                             p->style = abn_style;
 780                         }
 781                         p++;
 782                     }
 783                     else
 784 #endif
 785                     {
 786                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 787                             (!mc_global.utf8_display && is_printable (c)))
 788                         {
 789                             p->ch = c;
 790                             p++;
 791                         }
 792                         else
 793                         {
 794                             p->ch = '.';
 795                             p->style = abn_style;
 796                             p++;
 797                         }
 798                     }
 799                     col++;
 800                     break;
 801                 }               /* case */
 802
 803                 q++;
 804                 if (cw > 1)
 805                 {
 806                     q += cw - 1;
 807                 }
 808
 809                 if (col > (end_col - edit->start_col + 1))
 810                 {
 811                     if (wide_width_char)
 812                     {
 813                         p--;
 814                         break;
 815                     }
 816                     if (control_char)
 817                     {
 818                         p -= 2;
 819                         break;
 820                     }
 821                 }
 822             }
 823         }
 824     }
 825     else
 826     {
 827         start_col_real = start_col = 0;
 828     }
 829
 830     p->ch = 0;
 831
 832     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 833 }
 834
 835 /* --------------------------------------------------------------------------------------------- */
 836
 837 static inline void
 838 edit_draw_this_char (WEdit * edit, off_t curs, long row, long start_column, long end_column)
 839 {
 840     off_t b = edit_buffer_get_bol (&edit->buffer, curs);
 841
 842     edit_draw_this_line (edit, b, row, start_column, end_column);
 843 }
 844
 845 /* --------------------------------------------------------------------------------------------- */
 846 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 847
 848 static inline void
 849 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 850 {
 851     static long prev_curs_row = 0;
 852     static off_t prev_curs = 0;
 853
 854     Widget *w = WIDGET (edit);
 855     Widget *wh = WIDGET (w->owner);
 856
 857     int force = edit->force;
 858     int y1, x1, y2, x2;
 859
 860     int last_line;
 861     int last_column;
 862
 863     /* draw only visible region */
 864
 865     last_line = wh->y + wh->lines - 1;
 866
 867     y1 = w->y;
 868     if (y1 > last_line - 1 /* buttonbar */ )
 869         return;
 870
 871     last_column = wh->x + wh->cols - 1;
 872
 873     x1 = w->x;
 874     if (x1 > last_column)
 875         return;
 876
 877     y2 = w->y + w->lines - 1;
 878     if (y2 < wh->y + 1 /* menubar */ )
 879         return;
 880
 881     x2 = w->x + w->cols - 1;
 882     if (x2 < wh->x)
 883         return;
 884
 885     if ((force & REDRAW_IN_BOUNDS) == 0)
 886     {
 887         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 888         /* draw only visible region */
 889
 890         if (y2 <= last_line - 1 /* buttonbar */ )
 891             end_row = w->lines - 1;
 892         else if (y1 >= wh->y + 1 /* menubar */ )
 893             end_row = wh->lines - 1 - y1 - 1;
 894         else
 895             end_row = start_row + wh->lines - 1 - 1;
 896
 897         if (x2 <= last_column)
 898             end_column = w->cols - 1;
 899         else if (x1 >= wh->x)
 900             end_column = wh->cols - 1 - x1;
 901         else
 902             end_column = start_column + wh->cols - 1;
 903     }
 904
 905     /*
 906      * If the position of the page has not moved then we can draw the cursor
 907      * character only.  This will prevent line flicker when using arrow keys.
 908      */
 909     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 910     {
 911         long row, b;
 912
 913         if ((force & REDRAW_PAGE) != 0)
 914         {
 915             row = start_row;
 916             b = edit_buffer_move_forward (&edit->buffer, edit->start_display, start_row, 0);
 917             while (row <= end_row)
 918             {
 919                 if (key_pending (edit))
 920                     return;
 921                 edit_draw_this_line (edit, b, row, start_column, end_column);
 922                 b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
 923                 row++;
 924             }
 925         }
 926         else
 927         {
 928             long curs_row = edit->curs_row;
 929
 930             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 931             {
 932                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 933
 934                 row = start_row;
 935                 b = edit->start_display;
 936                 while (row <= upto)
 937                 {
 938                     if (key_pending (edit))
 939                         return;
 940                     edit_draw_this_line (edit, b, row, start_column, end_column);
 941                     b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
 942                 }
 943             }
 944
 945             /*          if (force & REDRAW_LINE)          ---> default */
 946             b = edit_buffer_get_current_bol (&edit->buffer);
 947             if (curs_row >= start_row && curs_row <= end_row)
 948             {
 949                 if (key_pending (edit))
 950                     return;
 951                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 952             }
 953
 954             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 955             {
 956                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 957                 b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
 958                 while (row <= end_row)
 959                 {
 960                     if (key_pending (edit))
 961                         return;
 962                     edit_draw_this_line (edit, b, row, start_column, end_column);
 963                     b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
 964                     row++;
 965                 }
 966             }
 967
 968             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 969             {
 970                 row = curs_row - 1;
 971                 b = edit_buffer_move_backward (&edit->buffer,
 972                                                edit_buffer_get_current_bol (&edit->buffer), 1);
 973                 if (row >= start_row && row <= end_row)
 974                 {
 975                     if (key_pending (edit))
 976                         return;
 977                     edit_draw_this_line (edit, b, row, start_column, end_column);
 978                 }
 979             }
 980
 981             if ((force & REDRAW_LINE_BELOW) != 0 && row < w->lines - 1)
 982             {
 983                 row = curs_row + 1;
 984                 b = edit_buffer_get_current_bol (&edit->buffer);
 985                 b = edit_buffer_move_forward (&edit->buffer, b, 1, 0);
 986                 if (row >= start_row && row <= end_row)
 987                 {
 988                     if (key_pending (edit))
 989                         return;
 990                     edit_draw_this_line (edit, b, row, start_column, end_column);
 991                 }
 992             }
 993         }
 994     }
 995     else if (prev_curs_row < edit->curs_row)
 996     {
 997         /* with the new text highlighting, we must draw from the top down */
 998         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 999         edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
1000     }
1001     else
1002     {
1003         edit_draw_this_char (edit, edit->buffer.curs1, edit->curs_row, start_column, end_column);
1004         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
1005     }
1006
1007     edit->force = 0;
1008
1009     prev_curs_row = edit->curs_row;
1010     prev_curs = edit->buffer.curs1;
1011 }
1012
1013 /* --------------------------------------------------------------------------------------------- */
1014
1015 static inline void
1016 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
1017 {
1018     if (page)                   /* if it was an expose event, 'page' would be set */
1019         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
1020
1021     render_edit_text (edit, row_start, col_start, row_end, col_end);
1022
1023     /*
1024      * edit->force != 0 means a key was pending and the redraw
1025      * was halted, so next time we must redraw everything in case stuff
1026      * was left undrawn from a previous key press.
1027      */
1028     if (edit->force)
1029         edit->force |= REDRAW_PAGE;
1030 }
1031
1032 /* --------------------------------------------------------------------------------------------- */
1033 /*** public functions ****************************************************************************/
1034 /* --------------------------------------------------------------------------------------------- */
1035
1036 void
1037 edit_status (WEdit * edit, gboolean active)
1038 {
1039     int color;
1040
1041     if (edit->fullscreen)
1042     {
1043         color = STATUSBAR_COLOR;
1044         edit_status_fullscreen (edit, color);
1045     }
1046     else
1047     {
1048         color = edit->drag_state != MCEDIT_DRAG_NORMAL ? EDITOR_FRAME_DRAG : active ?
1049             EDITOR_FRAME_ACTIVE : EDITOR_FRAME;
1050         edit_draw_frame (edit, color, active);
1051         edit_status_window (edit);
1052     }
1053
1054     edit_draw_window_icons (edit, color);
1055 }
1056
1057 /* --------------------------------------------------------------------------------------------- */
1058
1059 /** this scrolls the text so that cursor is on the screen */
1060 void
1061 edit_scroll_screen_over_cursor (WEdit * edit)
1062 {
1063     Widget *w = WIDGET (edit);
1064
1065     long p;
1066     long outby;
1067     int b_extreme, t_extreme, l_extreme, r_extreme;
1068
1069     if (w->lines <= 0 || w->cols <= 0)
1070         return;
1071
1072     w->lines -= EDIT_TEXT_VERTICAL_OFFSET;
1073     w->cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
1074
1075     if (!edit->fullscreen)
1076     {
1077         w->x++;
1078         w->cols -= 2;
1079         w->y++;
1080         w->lines -= 2;
1081     }
1082
1083     r_extreme = EDIT_RIGHT_EXTREME;
1084     l_extreme = EDIT_LEFT_EXTREME;
1085     b_extreme = EDIT_BOTTOM_EXTREME;
1086     t_extreme = EDIT_TOP_EXTREME;
1087     if (edit->found_len != 0)
1088     {
1089         b_extreme = max (w->lines / 4, b_extreme);
1090         t_extreme = max (w->lines / 4, t_extreme);
1091     }
1092     if (b_extreme + t_extreme + 1 > w->lines)
1093     {
1094         int n;
1095
1096         n = b_extreme + t_extreme;
1097         if (n == 0)
1098             n = 1;
1099         b_extreme = (b_extreme * (w->lines - 1)) / n;
1100         t_extreme = (t_extreme * (w->lines - 1)) / n;
1101     }
1102     if (l_extreme + r_extreme + 1 > w->cols)
1103     {
1104         int n;
1105
1106         n = l_extreme + t_extreme;
1107         if (n == 0)
1108             n = 1;
1109         l_extreme = (l_extreme * (w->cols - 1)) / n;
1110         r_extreme = (r_extreme * (w->cols - 1)) / n;
1111     }
1112     p = edit_get_col (edit) + edit->over_col;
1113     edit_update_curs_row (edit);
1114     outby = p + edit->start_col - w->cols + 1 + (r_extreme + edit->found_len);
1115     if (outby > 0)
1116         edit_scroll_right (edit, outby);
1117     outby = l_extreme - p - edit->start_col;
1118     if (outby > 0)
1119         edit_scroll_left (edit, outby);
1120     p = edit->curs_row;
1121     outby = p - w->lines + 1 + b_extreme;
1122     if (outby > 0)
1123         edit_scroll_downward (edit, outby);
1124     outby = t_extreme - p;
1125     if (outby > 0)
1126         edit_scroll_upward (edit, outby);
1127     edit_update_curs_row (edit);
1128
1129     w->lines += EDIT_TEXT_VERTICAL_OFFSET;
1130     w->cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
1131     if (!edit->fullscreen)
1132     {
1133         w->x--;
1134         w->cols += 2;
1135         w->y--;
1136         w->lines += 2;
1137     }
1138 }
1139
1140 /* --------------------------------------------------------------------------------------------- */
1141
1142 void
1143 edit_render_keypress (WEdit * edit)
1144 {
1145     edit_render (edit, 0, 0, 0, 0, 0);
1146 }
1147
1148 /* --------------------------------------------------------------------------------------------- */