src/editor/editdraw.c

   1 /* editor text drawing.
   2
   3    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   4    2007 Free Software Foundation, Inc.
   5
   6    Authors: 1996, 1997 Paul Sheer
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22  */
  23
  24 /** \file
  25  *  \brief Source: editor text drawing
  26  *  \author Paul Sheer
  27  *  \date 1996, 1997
  28  */
  29
  30 #include <config.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <stdarg.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40
  41 #include "lib/global.h"
  42 #include "lib/tty/tty.h"        /* tty_printf() */
  43 #include "lib/tty/key.h"        /* is_idle() */
  44 #include "lib/skin.h"
  45 #include "lib/strutil.h"        /* utf string functions */
  46 #include "lib/util.h"           /* is_printable() */
  47 #include "lib/widget.h"         /* buttonbar_redraw() */
  48 #include "lib/charsets.h"
  49
  50 #include "src/setup.h"          /* edit_tab_spacing */
  51
  52 #include "edit-impl.h"
  53 #include "edit-widget.h"
  54
  55 /*** global variables ****************************************************************************/
  56
  57 /* Toggles statusbar draw style */
  58 int simple_statusbar = 0;
  59
  60 int visible_tabs = 1, visible_tws = 1;
  61
  62 /*** file scope macro definitions ****************************************************************/
  63
  64 #define MAX_LINE_LEN 1024
  65
  66 /* Text styles */
  67 #define MOD_ABNORMAL            (1 << 8)
  68 #define MOD_BOLD                (1 << 9)
  69 #define MOD_MARKED              (1 << 10)
  70 #define MOD_CURSOR              (1 << 11)
  71 #define MOD_WHITESPACE          (1 << 12)
  72
  73 #define FONT_OFFSET_X 0
  74 #define FONT_OFFSET_Y 0
  75 #define FIXED_FONT 1
  76 #define FONT_PIX_PER_LINE 1
  77 #define FONT_MEAN_WIDTH 1
  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
  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
  99 static inline void
 100 status_string (WEdit * edit, char *s, int w)
 101 {
 102     char byte_str[16];
 103     unsigned char cur_byte = 0;
 104     unsigned int cur_utf = 0;
 105     int cw = 1;
 106
 107     /*
 108      * If we are at the end of file, print <EOF>,
 109      * otherwise print the current character as is (if printable),
 110      * as decimal and as hex.
 111      */
 112     if (edit->curs1 < edit->last_byte)
 113     {
 114         if (!edit->utf8)
 115         {
 116             cur_byte = edit_get_byte (edit, edit->curs1);
 117
 118             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 119                         (int) cur_byte, (unsigned) cur_byte);
 120         }
 121         else
 122         {
 123             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 124             if (cw > 0)
 125             {
 126                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 127                             (unsigned) cur_utf, (unsigned) cur_utf);
 128             }
 129             else
 130             {
 131                 cur_utf = edit_get_byte (edit, edit->curs1);
 132                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 133                             (int) cur_utf, (unsigned) cur_utf);
 134             }
 135
 136         }
 137     }
 138     else
 139     {
 140         strcpy (byte_str, "<EOF>     ");
 141     }
 142
 143     /* The field lengths just prevent the status line from shortening too much */
 144     if (simple_statusbar)
 145         g_snprintf (s, w,
 146                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 147                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 148                     edit->modified ? 'M' : '-',
 149                     macro_index < 0 ? '-' : 'R',
 150                     edit->overwrite == 0 ? '-' : 'O',
 151                     edit->curs_col + edit->over_col,
 152                     edit->curs_line + 1,
 153                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 154 #ifdef HAVE_CHARSET
 155                     mc_global.source_codepage >=
 156                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 157 #else
 158                     ""
 159 #endif
 160             );
 161     else
 162         g_snprintf (s, w,
 163                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 164                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 165                     edit->modified ? 'M' : '-',
 166                     macro_index < 0 ? '-' : 'R',
 167                     edit->overwrite == 0 ? '-' : 'O',
 168                     edit->curs_col + edit->over_col,
 169                     edit->start_line + 1,
 170                     edit->curs_row,
 171                     edit->curs_line + 1,
 172                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 173 #ifdef HAVE_CHARSET
 174                     mc_global.source_codepage >=
 175                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 176 #else
 177                     ""
 178 #endif
 179             );
 180 }
 181
 182 /* --------------------------------------------------------------------------------------------- */
 183
 184 static inline void
 185 printwstr (const char *s, int len)
 186 {
 187     if (len > 0)
 188         tty_printf ("%-*.*s", len, len, s);
 189 }
 190
 191 /* --------------------------------------------------------------------------------------------- */
 192
 193 static inline void
 194 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 195                  long end_col, struct line_s line[], char *status, int bookmarked)
 196 {
 197     struct line_s *p;
 198
 199     int x = start_col_real;
 200     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 201     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 202     int cols_to_skip = abs (x);
 203     int i;
 204     int wrap_start;
 205     int len;
 206
 207     tty_setcolor (EDITOR_NORMAL_COLOR);
 208     if (bookmarked != 0)
 209         tty_setcolor (bookmarked);
 210
 211     len = end_col + 1 - start_col;
 212     wrap_start = option_word_wrap_line_length + edit->start_col;
 213
 214     if (len > 0 && edit->widget.y + y >= 0)
 215     {
 216         if (!show_right_margin || wrap_start > end_col)
 217             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 218         else if (wrap_start < 0)
 219         {
 220             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 221             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 222         }
 223         else
 224         {
 225             if (wrap_start > 0)
 226                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', wrap_start);
 227
 228             len -= wrap_start;
 229             if (len > 0)
 230             {
 231                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 232                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1 + wrap_start, ' ', len);
 233             }
 234         }
 235     }
 236
 237     if (option_line_state)
 238     {
 239         tty_setcolor (LINE_STATE_COLOR);
 240         for (i = 0; i < LINE_STATE_WIDTH; i++)
 241         {
 242             edit_move (x1 + i + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 243             if (status[i] == '\0')
 244                 status[i] = ' ';
 245             tty_print_char (status[i]);
 246         }
 247     }
 248
 249     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 250     p = line;
 251     i = 1;
 252     while (p->ch)
 253     {
 254         int style;
 255         unsigned int textchar;
 256         int color;
 257
 258         if (cols_to_skip)
 259         {
 260             p++;
 261             cols_to_skip--;
 262             continue;
 263         }
 264
 265         style = p->style & 0xFF00;
 266         textchar = p->ch;
 267         color = p->style >> 16;
 268
 269         if (style & MOD_ABNORMAL)
 270         {
 271             /* Non-printable - use black background */
 272             color = 0;
 273         }
 274
 275         if (style & MOD_WHITESPACE)
 276         {
 277             if (style & MOD_MARKED)
 278             {
 279                 textchar = ' ';
 280                 tty_setcolor (EDITOR_MARKED_COLOR);
 281             }
 282             else
 283             {
 284 #if 0
 285                 if (color != EDITOR_NORMAL_COLOR)
 286                 {
 287                     textchar = ' ';
 288                     tty_lowlevel_setcolor (color);
 289                 }
 290                 else
 291 #endif
 292                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 293             }
 294         }
 295         else
 296         {
 297             if (style & MOD_BOLD)
 298             {
 299                 tty_setcolor (EDITOR_BOLD_COLOR);
 300             }
 301             else if (style & MOD_MARKED)
 302             {
 303                 tty_setcolor (EDITOR_MARKED_COLOR);
 304             }
 305             else
 306             {
 307                 tty_lowlevel_setcolor (color);
 308             }
 309         }
 310         if (show_right_margin)
 311         {
 312             if (i > option_word_wrap_line_length + edit->start_col)
 313                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 314             i++;
 315         }
 316         tty_print_anychar (textchar);
 317         p++;
 318     }
 319 }
 320
 321 /* --------------------------------------------------------------------------------------------- */
 322 /** b is a pointer to the beginning of the line */
 323
 324 static void
 325 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 326 {
 327     struct line_s line[MAX_LINE_LEN];
 328     struct line_s *p = line;
 329
 330     long m1 = 0, m2 = 0, q, c1, c2;
 331     int col, start_col_real;
 332     unsigned int c;
 333     int color;
 334     int abn_style;
 335     int i;
 336     int utf8lag = 0;
 337     unsigned int cur_line = 0;
 338     int book_mark = 0;
 339     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 340
 341     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 342         return;
 343
 344     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 345         book_mark = BOOK_MARK_COLOR;
 346     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 347         book_mark = BOOK_MARK_FOUND_COLOR;
 348
 349     if (book_mark)
 350         abn_style = book_mark << 16;
 351     else
 352         abn_style = MOD_ABNORMAL;
 353
 354     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 355
 356     edit_get_syntax_color (edit, b - 1, &color);
 357     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 358     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 359     if (option_line_state)
 360     {
 361         cur_line = edit->start_line + row;
 362         if (cur_line <= (unsigned int) edit->total_lines)
 363         {
 364             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 365         }
 366         else
 367         {
 368             memset (line_stat, ' ', LINE_STATE_WIDTH);
 369             line_stat[LINE_STATE_WIDTH] = '\0';
 370         }
 371         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 372         {
 373             g_snprintf (line_stat, 2, "*");
 374         }
 375     }
 376
 377     if (col + 16 > -edit->start_col)
 378     {
 379         eval_marks (edit, &m1, &m2);
 380
 381         if (row <= edit->total_lines - edit->start_line)
 382         {
 383             long tws = 0;
 384             if (tty_use_colors () && visible_tws)
 385             {
 386                 tws = edit_eol (edit, b);
 387                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 388                     tws--;
 389             }
 390
 391             while (col <= end_col - edit->start_col)
 392             {
 393                 int cw = 1;
 394
 395                 p->ch = 0;
 396                 p->style = 0;
 397                 if (q == edit->curs1)
 398                     p->style |= MOD_CURSOR;
 399                 if (q >= m1 && q < m2)
 400                 {
 401                     if (edit->column_highlight)
 402                     {
 403                         int x;
 404                         x = edit_move_forward3 (edit, b, 0, q);
 405                         c1 = min (edit->column1, edit->column2);
 406                         c2 = max (edit->column1, edit->column2);
 407                         if (x >= c1 && x < c2)
 408                             p->style |= MOD_MARKED;
 409                     }
 410                     else
 411                         p->style |= MOD_MARKED;
 412                 }
 413                 if (q == edit->bracket)
 414                     p->style |= MOD_BOLD;
 415                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 416                     p->style |= MOD_BOLD;
 417
 418                 if (!edit->utf8)
 419                 {
 420                     c = edit_get_byte (edit, q);
 421                 }
 422                 else
 423                 {
 424                     c = edit_get_utf (edit, q, &cw);
 425                 }
 426                 /* we don't use bg for mc - fg contains both */
 427                 if (book_mark)
 428                 {
 429                     p->style |= book_mark << 16;
 430                 }
 431                 else
 432                 {
 433                     edit_get_syntax_color (edit, q, &color);
 434                     p->style |= color << 16;
 435                 }
 436                 switch (c)
 437                 {
 438                 case '\n':
 439                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 440                     break;
 441                 case '\t':
 442                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 443                     col += i;
 444                     if (tty_use_colors () &&
 445                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 446                     {
 447                         if (p->style & MOD_MARKED)
 448                             c = p->style;
 449                         else if (book_mark)
 450                             c |= book_mark << 16;
 451                         else
 452                             c = p->style | MOD_WHITESPACE;
 453                         if (i > 2)
 454                         {
 455                             p->ch = '<';
 456                             p->style = c;
 457                             p++;
 458                             while (--i > 1)
 459                             {
 460                                 p->ch = '-';
 461                                 p->style = c;
 462                                 p++;
 463                             }
 464                             p->ch = '>';
 465                             p->style = c;
 466                             p++;
 467                         }
 468                         else if (i > 1)
 469                         {
 470                             p->ch = '<';
 471                             p->style = c;
 472                             p++;
 473                             p->ch = '>';
 474                             p->style = c;
 475                             p++;
 476                         }
 477                         else
 478                         {
 479                             p->ch = '>';
 480                             p->style = c;
 481                             p++;
 482                         }
 483                     }
 484                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 485                     {
 486                         p->ch = '.';
 487                         p->style |= MOD_WHITESPACE;
 488                         c = p->style & ~MOD_CURSOR;
 489                         p++;
 490                         while (--i)
 491                         {
 492                             p->ch = ' ';
 493                             p->style = c;
 494                             p++;
 495                         }
 496                     }
 497                     else
 498                     {
 499                         p->ch |= ' ';
 500                         c = p->style & ~MOD_CURSOR;
 501                         p++;
 502                         while (--i)
 503                         {
 504                             p->ch = ' ';
 505                             p->style = c;
 506                             p++;
 507                         }
 508                     }
 509                     break;
 510                 case ' ':
 511                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 512                     {
 513                         p->ch = '.';
 514                         p->style |= MOD_WHITESPACE;
 515                         p++;
 516                         col++;
 517                         break;
 518                     }
 519                     /* fallthrough */
 520                 default:
 521 #ifdef HAVE_CHARSET
 522                     if (mc_global.utf8_display)
 523                     {
 524                         if (!edit->utf8)
 525                         {
 526                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 527                         }
 528                     }
 529                     else if (edit->utf8)
 530                         c = convert_from_utf_to_current_c (c, edit->converter);
 531                     else
 532 #endif
 533                         c = convert_to_display_c (c);
 534
 535                     /* Caret notation for control characters */
 536                     if (c < 32)
 537                     {
 538                         p->ch = '^';
 539                         p->style = abn_style;
 540                         p++;
 541                         p->ch = c + 0x40;
 542                         p->style = abn_style;
 543                         p++;
 544                         col += 2;
 545                         break;
 546                     }
 547                     if (c == 127)
 548                     {
 549                         p->ch = '^';
 550                         p->style = abn_style;
 551                         p++;
 552                         p->ch = '?';
 553                         p->style = abn_style;
 554                         p++;
 555                         col += 2;
 556                         break;
 557                     }
 558                     if (!edit->utf8)
 559                     {
 560                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 561                             (!mc_global.utf8_display && is_printable (c)))
 562                         {
 563                             p->ch = c;
 564                             p++;
 565                         }
 566                         else
 567                         {
 568                             p->ch = '.';
 569                             p->style = abn_style;
 570                             p++;
 571                         }
 572                     }
 573                     else
 574                     {
 575                         if (g_unichar_isprint (c))
 576                         {
 577                             p->ch = c;
 578                             p++;
 579                         }
 580                         else
 581                         {
 582                             p->ch = '.';
 583                             p->style = abn_style;
 584                             p++;
 585                         }
 586                     }
 587                     col++;
 588                     break;
 589                 }               /* case */
 590
 591                 q++;
 592                 if (cw > 1)
 593                 {
 594                     q += cw - 1;
 595                 }
 596             }
 597         }
 598     }
 599     else
 600     {
 601         start_col_real = start_col = 0;
 602     }
 603
 604     p->ch = '\0';
 605
 606     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 607 }
 608
 609 /* --------------------------------------------------------------------------------------------- */
 610
 611 static inline void
 612 edit_draw_this_char (WEdit * edit, long curs, long row, long start_column, long end_column)
 613 {
 614     int b = edit_bol (edit, curs);
 615     edit_draw_this_line (edit, b, row, start_column, end_column);
 616 }
 617
 618 /* --------------------------------------------------------------------------------------------- */
 619 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 620
 621 static inline void
 622 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 623 {
 624     static long prev_curs_row = 0;
 625     static long prev_curs = 0;
 626
 627     Widget *w = (Widget *) edit;
 628     Dlg_head *h = w->owner;
 629
 630     long row = 0, curs_row;
 631     int force = edit->force;
 632     long b;
 633     int y1, x1, y2, x2;
 634
 635     int last_line;
 636     int last_column;
 637
 638     /* draw only visible region */
 639
 640     last_line = h->y + h->lines - 1;
 641
 642     y1 = w->y;
 643     if (y1 > last_line - 1 /* buttonbar */ )
 644         return;
 645
 646     last_column = h->x + h->cols - 1;
 647
 648     x1 = w->x;
 649     if (x1 > last_column)
 650         return;
 651
 652     y2 = w->y + w->lines - 1;
 653     if (y2 < h->y + 1 /* menubar */ )
 654         return;
 655
 656     x2 = w->x + w->cols - 1;
 657     if (x2 < h->x)
 658         return;
 659
 660     if ((force & REDRAW_IN_BOUNDS) == 0)
 661     {
 662         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 663         /* draw only visible region */
 664
 665         if (y2 <= last_line - 1 /* buttonbar */ )
 666             end_row = w->lines - 1;
 667         else if (y1 >= h->y + 1 /* menubar */ )
 668             end_row = h->lines - 1 - y1 - 1;
 669         else
 670             end_row = start_row + h->lines - 1 - 1;
 671
 672         if (x2 <= last_column)
 673             end_column = w->cols - 1;
 674         else if (x1 >= h->x)
 675             end_column = h->cols - 1 - x1;
 676         else
 677             end_column = start_column + h->cols - 1;
 678     }
 679
 680     /*
 681      * If the position of the page has not moved then we can draw the cursor
 682      * character only.  This will prevent line flicker when using arrow keys.
 683      */
 684     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 685     {
 686         if ((force & REDRAW_PAGE) != 0)
 687         {
 688             row = start_row;
 689             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 690             while (row <= end_row)
 691             {
 692                 if (key_pending (edit))
 693                     return;
 694                 edit_draw_this_line (edit, b, row, start_column, end_column);
 695                 b = edit_move_forward (edit, b, 1, 0);
 696                 row++;
 697             }
 698         }
 699         else
 700         {
 701             curs_row = edit->curs_row;
 702
 703             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 704             {
 705                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 706
 707                 row = start_row;
 708                 b = edit->start_display;
 709                 while (row <= upto)
 710                 {
 711                     if (key_pending (edit))
 712                         return;
 713                     edit_draw_this_line (edit, b, row, start_column, end_column);
 714                     b = edit_move_forward (edit, b, 1, 0);
 715                 }
 716             }
 717
 718             /*          if (force & REDRAW_LINE)          ---> default */
 719             b = edit_bol (edit, edit->curs1);
 720             if (curs_row >= start_row && curs_row <= end_row)
 721             {
 722                 if (key_pending (edit))
 723                     return;
 724                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 725             }
 726
 727             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 728             {
 729                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 730                 b = edit_move_forward (edit, b, 1, 0);
 731                 while (row <= end_row)
 732                 {
 733                     if (key_pending (edit))
 734                         return;
 735                     edit_draw_this_line (edit, b, row, start_column, end_column);
 736                     b = edit_move_forward (edit, b, 1, 0);
 737                     row++;
 738                 }
 739             }
 740
 741             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 742             {
 743                 row = curs_row - 1;
 744                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 745                 if (row >= start_row && row <= end_row)
 746                 {
 747                     if (key_pending (edit))
 748                         return;
 749                     edit_draw_this_line (edit, b, row, start_column, end_column);
 750                 }
 751             }
 752
 753             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 754             {
 755                 row = curs_row + 1;
 756                 b = edit_bol (edit, edit->curs1);
 757                 b = edit_move_forward (edit, b, 1, 0);
 758                 if (row >= start_row && row <= end_row)
 759                 {
 760                     if (key_pending (edit))
 761                         return;
 762                     edit_draw_this_line (edit, b, row, start_column, end_column);
 763                 }
 764             }
 765         }
 766     }
 767     else if (prev_curs_row < edit->curs_row)
 768     {
 769         /* with the new text highlighting, we must draw from the top down */
 770         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 771         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 772     }
 773     else
 774     {
 775         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 776         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 777     }
 778
 779     edit->force = 0;
 780
 781     prev_curs_row = edit->curs_row;
 782     prev_curs = edit->curs1;
 783 }
 784
 785 /* --------------------------------------------------------------------------------------------- */
 786
 787 static inline void
 788 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 789 {
 790     if (page)                   /* if it was an expose event, 'page' would be set */
 791         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 792
 793     if (edit->force & REDRAW_COMPLETELY)
 794         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 795     render_edit_text (edit, row_start, col_start, row_end, col_end);
 796     /*
 797      * edit->force != 0 means a key was pending and the redraw
 798      * was halted, so next time we must redraw everything in case stuff
 799      * was left undrawn from a previous key press.
 800      */
 801     if (edit->force)
 802         edit->force |= REDRAW_PAGE;
 803 }
 804
 805 /* --------------------------------------------------------------------------------------------- */
 806 /*** public functions ****************************************************************************/
 807 /* --------------------------------------------------------------------------------------------- */
 808
 809 /** Draw the status line at the top of the screen. The size of the filename
 810  * field varies depending on the width of the screen and the length of
 811  * the filename. */
 812 void
 813 edit_status (WEdit * edit)
 814 {
 815     const int w = edit->widget.owner->cols;
 816     const size_t status_size = w + 1;
 817     char *const status = g_malloc (status_size);
 818     int status_len;
 819     const char *fname = "";
 820     int fname_len;
 821     const int gap = 3;          /* between the filename and the status */
 822     const int right_gap = 5;    /* at the right end of the screen */
 823     const int preferred_fname_len = 16;
 824
 825     status_string (edit, status, status_size);
 826     status_len = (int) str_term_width1 (status);
 827
 828     if (edit->filename)
 829         fname = edit->filename;
 830     fname_len = str_term_width1 (fname);
 831     if (fname_len < preferred_fname_len)
 832         fname_len = preferred_fname_len;
 833
 834     if (fname_len + gap + status_len + right_gap >= w)
 835     {
 836         if (preferred_fname_len + gap + status_len + right_gap >= w)
 837             fname_len = preferred_fname_len;
 838         else
 839             fname_len = w - (gap + status_len + right_gap);
 840         fname = str_trunc (fname, fname_len);
 841     }
 842
 843     dlg_move (edit->widget.owner, 0, 0);
 844     tty_setcolor (STATUSBAR_COLOR);
 845     printwstr (fname, fname_len + gap);
 846     printwstr (status, w - (fname_len + gap));
 847
 848     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 849     {
 850         size_t percent = 100;
 851
 852         if (edit->total_lines + 1 != 0)
 853             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 854         dlg_move (edit->widget.owner, 0, w - 5);
 855         tty_printf (" %3d%%", percent);
 856     }
 857
 858     g_free (status);
 859 }
 860
 861 /* --------------------------------------------------------------------------------------------- */
 862 /** this scrolls the text so that cursor is on the screen */
 863 void
 864 edit_scroll_screen_over_cursor (WEdit * edit)
 865 {
 866     int p;
 867     int outby;
 868     int b_extreme, t_extreme, l_extreme, r_extreme;
 869
 870     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 871         return;
 872
 873     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 874     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 875
 876     r_extreme = EDIT_RIGHT_EXTREME;
 877     l_extreme = EDIT_LEFT_EXTREME;
 878     b_extreme = EDIT_BOTTOM_EXTREME;
 879     t_extreme = EDIT_TOP_EXTREME;
 880     if (edit->found_len)
 881     {
 882         b_extreme = max (edit->widget.lines / 4, b_extreme);
 883         t_extreme = max (edit->widget.lines / 4, t_extreme);
 884     }
 885     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 886     {
 887         int n;
 888
 889         n = b_extreme + t_extreme;
 890         if (n == 0)
 891             n = 1;
 892         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 893         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 894     }
 895     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 896     {
 897         int n;
 898
 899         n = l_extreme + t_extreme;
 900         if (n == 0)
 901             n = 1;
 902         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 903         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 904     }
 905     p = edit_get_col (edit) + edit->over_col;
 906     edit_update_curs_row (edit);
 907     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 908     if (outby > 0)
 909         edit_scroll_right (edit, outby);
 910     outby = l_extreme - p - edit->start_col;
 911     if (outby > 0)
 912         edit_scroll_left (edit, outby);
 913     p = edit->curs_row;
 914     outby = p - edit->widget.lines + 1 + b_extreme;
 915     if (outby > 0)
 916         edit_scroll_downward (edit, outby);
 917     outby = t_extreme - p;
 918     if (outby > 0)
 919         edit_scroll_upward (edit, outby);
 920     edit_update_curs_row (edit);
 921
 922     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 923     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 924 }
 925
 926 /* --------------------------------------------------------------------------------------------- */
 927
 928 void
 929 edit_render_keypress (WEdit * edit)
 930 {
 931     edit_render (edit, 0, 0, 0, 0, 0);
 932 }
 933
 934 /* --------------------------------------------------------------------------------------------- */