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
   6    The Free Software Foundation, Inc.
   7
   8    Written by:
   9    Paul Sheer, 1996, 1997
  10
  11    This file is part of the Midnight Commander.
  12
  13    The Midnight Commander is free software: you can redistribute it
  14    and/or modify it under the terms of the GNU General Public License as
  15    published by the Free Software Foundation, either version 3 of the License,
  16    or (at your option) any later version.
  17
  18    The Midnight Commander is distributed in the hope that it will be useful,
  19    but WITHOUT ANY WARRANTY; without even the implied warranty of
  20    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21    GNU General Public License for more details.
  22
  23    You should have received a copy of the GNU General Public License
  24    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  25  */
  26
  27 /** \file
  28  *  \brief Source: editor text drawing
  29  *  \author Paul Sheer
  30  *  \date 1996, 1997
  31  */
  32
  33 #include <config.h>
  34 #include <stdlib.h>
  35 #include <stdio.h>
  36 #include <stdarg.h>
  37 #include <sys/types.h>
  38 #include <unistd.h>
  39 #include <string.h>
  40 #include <ctype.h>
  41 #include <errno.h>
  42 #include <sys/stat.h>
  43
  44 #include "lib/global.h"
  45 #include "lib/tty/tty.h"        /* tty_printf() */
  46 #include "lib/tty/key.h"        /* is_idle() */
  47 #include "lib/skin.h"
  48 #include "lib/strutil.h"        /* utf string functions */
  49 #include "lib/util.h"           /* is_printable() */
  50 #include "lib/widget.h"         /* buttonbar_redraw() */
  51 #ifdef HAVE_CHARSET
  52 #include "lib/charsets.h"
  53 #endif
  54
  55 #include "src/setup.h"          /* edit_tab_spacing */
  56 #include "src/main.h"           /* macro_index */
  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 struct line_s
  88 {
  89     unsigned int ch;
  90     unsigned int style;
  91 };
  92
  93 /*** file scope variables ************************************************************************/
  94
  95 /*** file scope functions ************************************************************************/
  96 /* --------------------------------------------------------------------------------------------- */
  97
  98 static inline void
  99 status_string (WEdit * edit, char *s, int w)
 100 {
 101     char byte_str[16];
 102     unsigned char cur_byte = 0;
 103     unsigned int cur_utf = 0;
 104     int cw = 1;
 105
 106     /*
 107      * If we are at the end of file, print <EOF>,
 108      * otherwise print the current character as is (if printable),
 109      * as decimal and as hex.
 110      */
 111     if (edit->curs1 < edit->last_byte)
 112     {
 113         if (!edit->utf8)
 114         {
 115             cur_byte = edit_get_byte (edit, edit->curs1);
 116
 117             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 118                         (int) cur_byte, (unsigned) cur_byte);
 119         }
 120         else
 121         {
 122             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 123             if (cw > 0)
 124             {
 125                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 126                             (unsigned) cur_utf, (unsigned) cur_utf);
 127             }
 128             else
 129             {
 130                 cur_utf = edit_get_byte (edit, edit->curs1);
 131                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 132                             (int) cur_utf, (unsigned) cur_utf);
 133             }
 134
 135         }
 136     }
 137     else
 138     {
 139         strcpy (byte_str, "<EOF>     ");
 140     }
 141
 142     /* The field lengths just prevent the status line from shortening too much */
 143     if (simple_statusbar)
 144         g_snprintf (s, w,
 145                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 146                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 147                     edit->modified ? 'M' : '-',
 148                     macro_index < 0 ? '-' : 'R',
 149                     edit->overwrite == 0 ? '-' : 'O',
 150                     edit->curs_col + edit->over_col,
 151                     edit->curs_line + 1,
 152                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 153 #ifdef HAVE_CHARSET
 154                     mc_global.source_codepage >=
 155                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 156 #else
 157                     ""
 158 #endif
 159             );
 160     else
 161         g_snprintf (s, w,
 162                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 163                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 164                     edit->modified ? 'M' : '-',
 165                     macro_index < 0 ? '-' : 'R',
 166                     edit->overwrite == 0 ? '-' : 'O',
 167                     edit->curs_col + edit->over_col,
 168                     edit->start_line + 1,
 169                     edit->curs_row,
 170                     edit->curs_line + 1,
 171                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 172 #ifdef HAVE_CHARSET
 173                     mc_global.source_codepage >=
 174                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 175 #else
 176                     ""
 177 #endif
 178             );
 179 }
 180
 181 /* --------------------------------------------------------------------------------------------- */
 182
 183 static inline void
 184 printwstr (const char *s, int len)
 185 {
 186     if (len > 0)
 187         tty_printf ("%-*.*s", len, len, s);
 188 }
 189
 190 /* --------------------------------------------------------------------------------------------- */
 191
 192 static inline void
 193 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 194                  long end_col, struct line_s line[], char *status, int bookmarked)
 195 {
 196     struct line_s *p;
 197
 198     int x = start_col_real;
 199     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 200     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 201     int cols_to_skip = abs (x);
 202     int i;
 203     int wrap_start;
 204     int len;
 205
 206     tty_setcolor (EDITOR_NORMAL_COLOR);
 207     if (bookmarked != 0)
 208         tty_setcolor (bookmarked);
 209
 210     len = end_col + 1 - start_col;
 211     wrap_start = option_word_wrap_line_length + edit->start_col;
 212
 213     if (len > 0 && edit->widget.y + y >= 0)
 214     {
 215         if (!show_right_margin || wrap_start > end_col)
 216             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 217         else if (wrap_start < 0)
 218         {
 219             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 220             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 221         }
 222         else
 223         {
 224             if (wrap_start > 0)
 225                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', wrap_start);
 226
 227             len -= wrap_start;
 228             if (len > 0)
 229             {
 230                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 231                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1 + wrap_start, ' ', len);
 232             }
 233         }
 234     }
 235
 236     if (option_line_state)
 237     {
 238         tty_setcolor (LINE_STATE_COLOR);
 239         for (i = 0; i < LINE_STATE_WIDTH; i++)
 240         {
 241             edit_move (x1 + i - option_line_state_width, y);
 242             if (status[i] == '\0')
 243                 status[i] = ' ';
 244             tty_print_char (status[i]);
 245         }
 246     }
 247
 248     edit_move (x1, y);
 249     p = line;
 250     i = 1;
 251     while (p->ch)
 252     {
 253         int style;
 254         unsigned int textchar;
 255         int color;
 256
 257         if (cols_to_skip)
 258         {
 259             p++;
 260             cols_to_skip--;
 261             continue;
 262         }
 263
 264         style = p->style & 0xFF00;
 265         textchar = p->ch;
 266         color = p->style >> 16;
 267
 268         if (style & MOD_ABNORMAL)
 269         {
 270             /* Non-printable - use black background */
 271             color = 0;
 272         }
 273
 274         if (style & MOD_WHITESPACE)
 275         {
 276             if (style & MOD_MARKED)
 277             {
 278                 textchar = ' ';
 279                 tty_setcolor (EDITOR_MARKED_COLOR);
 280             }
 281             else
 282             {
 283 #if 0
 284                 if (color != EDITOR_NORMAL_COLOR)
 285                 {
 286                     textchar = ' ';
 287                     tty_lowlevel_setcolor (color);
 288                 }
 289                 else
 290 #endif
 291                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 292             }
 293         }
 294         else
 295         {
 296             if (style & MOD_BOLD)
 297             {
 298                 tty_setcolor (EDITOR_BOLD_COLOR);
 299             }
 300             else if (style & MOD_MARKED)
 301             {
 302                 tty_setcolor (EDITOR_MARKED_COLOR);
 303             }
 304             else
 305             {
 306                 tty_lowlevel_setcolor (color);
 307             }
 308         }
 309         if (show_right_margin)
 310         {
 311             if (i > option_word_wrap_line_length + edit->start_col)
 312                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 313             i++;
 314         }
 315         tty_print_anychar (textchar);
 316         p++;
 317     }
 318 }
 319
 320 /* --------------------------------------------------------------------------------------------- */
 321 /** b is a pointer to the beginning of the line */
 322
 323 static void
 324 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 325 {
 326     struct line_s line[MAX_LINE_LEN];
 327     struct line_s *p = line;
 328
 329     long m1 = 0, m2 = 0, q, c1, c2;
 330     int col, start_col_real;
 331     unsigned int c;
 332     int color;
 333     int abn_style;
 334     int i;
 335     int utf8lag = 0;
 336     unsigned int cur_line = 0;
 337     int book_mark = 0;
 338     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 339
 340     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 341         return;
 342
 343     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 344         book_mark = BOOK_MARK_COLOR;
 345     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 346         book_mark = BOOK_MARK_FOUND_COLOR;
 347
 348     if (book_mark)
 349         abn_style = book_mark << 16;
 350     else
 351         abn_style = MOD_ABNORMAL;
 352
 353     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 354
 355     edit_get_syntax_color (edit, b - 1, &color);
 356     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 357     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 358     if (option_line_state)
 359     {
 360         cur_line = edit->start_line + row;
 361         if (cur_line <= (unsigned int) edit->total_lines)
 362         {
 363             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 364         }
 365         else
 366         {
 367             memset (line_stat, ' ', LINE_STATE_WIDTH);
 368             line_stat[LINE_STATE_WIDTH] = '\0';
 369         }
 370         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 371         {
 372             g_snprintf (line_stat, 2, "*");
 373         }
 374     }
 375
 376     if (col + 16 > -edit->start_col)
 377     {
 378         eval_marks (edit, &m1, &m2);
 379
 380         if (row <= edit->total_lines - edit->start_line)
 381         {
 382             long tws = 0;
 383             if (tty_use_colors () && visible_tws)
 384             {
 385                 tws = edit_eol (edit, b);
 386                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 387                     tws--;
 388             }
 389
 390             while (col <= end_col - edit->start_col)
 391             {
 392                 int cw = 1;
 393
 394                 p->ch = 0;
 395                 p->style = 0;
 396                 if (q == edit->curs1)
 397                     p->style |= MOD_CURSOR;
 398                 if (q >= m1 && q < m2)
 399                 {
 400                     if (edit->column_highlight)
 401                     {
 402                         int x;
 403                         x = edit_move_forward3 (edit, b, 0, q);
 404                         c1 = min (edit->column1, edit->column2);
 405                         c2 = max (edit->column1, edit->column2);
 406                         if (x >= c1 && x < c2)
 407                             p->style |= MOD_MARKED;
 408                     }
 409                     else
 410                         p->style |= MOD_MARKED;
 411                 }
 412                 if (q == edit->bracket)
 413                     p->style |= MOD_BOLD;
 414                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 415                     p->style |= MOD_BOLD;
 416
 417                 if (!edit->utf8)
 418                 {
 419                     c = edit_get_byte (edit, q);
 420                 }
 421                 else
 422                 {
 423                     c = edit_get_utf (edit, q, &cw);
 424                 }
 425                 /* we don't use bg for mc - fg contains both */
 426                 if (book_mark)
 427                 {
 428                     p->style |= book_mark << 16;
 429                 }
 430                 else
 431                 {
 432                     edit_get_syntax_color (edit, q, &color);
 433                     p->style |= color << 16;
 434                 }
 435                 switch (c)
 436                 {
 437                 case '\n':
 438                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 439                     break;
 440                 case '\t':
 441                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 442                     col += i;
 443                     if (tty_use_colors () &&
 444                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 445                     {
 446                         if (p->style & MOD_MARKED)
 447                             c = p->style;
 448                         else if (book_mark)
 449                             c |= book_mark << 16;
 450                         else
 451                             c = p->style | MOD_WHITESPACE;
 452                         if (i > 2)
 453                         {
 454                             p->ch = '<';
 455                             p->style = c;
 456                             p++;
 457                             while (--i > 1)
 458                             {
 459                                 p->ch = '-';
 460                                 p->style = c;
 461                                 p++;
 462                             }
 463                             p->ch = '>';
 464                             p->style = c;
 465                             p++;
 466                         }
 467                         else if (i > 1)
 468                         {
 469                             p->ch = '<';
 470                             p->style = c;
 471                             p++;
 472                             p->ch = '>';
 473                             p->style = c;
 474                             p++;
 475                         }
 476                         else
 477                         {
 478                             p->ch = '>';
 479                             p->style = c;
 480                             p++;
 481                         }
 482                     }
 483                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 484                     {
 485                         p->ch = '.';
 486                         p->style |= MOD_WHITESPACE;
 487                         c = p->style & ~MOD_CURSOR;
 488                         p++;
 489                         while (--i)
 490                         {
 491                             p->ch = ' ';
 492                             p->style = c;
 493                             p++;
 494                         }
 495                     }
 496                     else
 497                     {
 498                         p->ch |= ' ';
 499                         c = p->style & ~MOD_CURSOR;
 500                         p++;
 501                         while (--i)
 502                         {
 503                             p->ch = ' ';
 504                             p->style = c;
 505                             p++;
 506                         }
 507                     }
 508                     break;
 509                 case ' ':
 510                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 511                     {
 512                         p->ch = '.';
 513                         p->style |= MOD_WHITESPACE;
 514                         p++;
 515                         col++;
 516                         break;
 517                     }
 518                     /* fallthrough */
 519                 default:
 520 #ifdef HAVE_CHARSET
 521                     if (mc_global.utf8_display)
 522                     {
 523                         if (!edit->utf8)
 524                         {
 525                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 526                         }
 527                     }
 528                     else if (edit->utf8)
 529                         c = convert_from_utf_to_current_c (c, edit->converter);
 530                     else
 531                         c = convert_to_display_c (c);
 532 #endif
 533
 534                     /* Caret notation for control characters */
 535                     if (c < 32)
 536                     {
 537                         p->ch = '^';
 538                         p->style = abn_style;
 539                         p++;
 540                         p->ch = c + 0x40;
 541                         p->style = abn_style;
 542                         p++;
 543                         col += 2;
 544                         break;
 545                     }
 546                     if (c == 127)
 547                     {
 548                         p->ch = '^';
 549                         p->style = abn_style;
 550                         p++;
 551                         p->ch = '?';
 552                         p->style = abn_style;
 553                         p++;
 554                         col += 2;
 555                         break;
 556                     }
 557                     if (!edit->utf8)
 558                     {
 559                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 560                             (!mc_global.utf8_display && is_printable (c)))
 561                         {
 562                             p->ch = c;
 563                             p++;
 564                         }
 565                         else
 566                         {
 567                             p->ch = '.';
 568                             p->style = abn_style;
 569                             p++;
 570                         }
 571                     }
 572                     else
 573                     {
 574                         if (g_unichar_isprint (c))
 575                         {
 576                             p->ch = c;
 577                             p++;
 578                         }
 579                         else
 580                         {
 581                             p->ch = '.';
 582                             p->style = abn_style;
 583                             p++;
 584                         }
 585                     }
 586                     col++;
 587                     break;
 588                 }               /* case */
 589
 590                 q++;
 591                 if (cw > 1)
 592                 {
 593                     q += cw - 1;
 594                 }
 595             }
 596         }
 597     }
 598     else
 599     {
 600         start_col_real = start_col = 0;
 601     }
 602
 603     p->ch = '\0';
 604
 605     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 606 }
 607
 608 /* --------------------------------------------------------------------------------------------- */
 609
 610 static inline void
 611 edit_draw_this_char (WEdit * edit, long curs, long row, long start_column, long end_column)
 612 {
 613     int b = edit_bol (edit, curs);
 614     edit_draw_this_line (edit, b, row, start_column, end_column);
 615 }
 616
 617 /* --------------------------------------------------------------------------------------------- */
 618 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 619
 620 static inline void
 621 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 622 {
 623     static long prev_curs_row = 0;
 624     static long prev_curs = 0;
 625
 626     Widget *w = (Widget *) edit;
 627     Dlg_head *h = w->owner;
 628
 629     long row = 0, curs_row;
 630     int force = edit->force;
 631     long b;
 632     int y1, x1, y2, x2;
 633
 634     int last_line;
 635     int last_column;
 636
 637     /* draw only visible region */
 638
 639     last_line = h->y + h->lines - 1;
 640
 641     y1 = w->y;
 642     if (y1 > last_line - 1 /* buttonbar */ )
 643         return;
 644
 645     last_column = h->x + h->cols - 1;
 646
 647     x1 = w->x;
 648     if (x1 > last_column)
 649         return;
 650
 651     y2 = w->y + w->lines - 1;
 652     if (y2 < h->y + 1 /* menubar */ )
 653         return;
 654
 655     x2 = w->x + w->cols - 1;
 656     if (x2 < h->x)
 657         return;
 658
 659     if ((force & REDRAW_IN_BOUNDS) == 0)
 660     {
 661         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 662         /* draw only visible region */
 663
 664         if (y2 <= last_line - 1 /* buttonbar */ )
 665             end_row = w->lines - 1;
 666         else if (y1 >= h->y + 1 /* menubar */ )
 667             end_row = h->lines - 1 - y1 - 1;
 668         else
 669             end_row = start_row + h->lines - 1 - 1;
 670
 671         if (x2 <= last_column)
 672             end_column = w->cols - 1;
 673         else if (x1 >= h->x)
 674             end_column = h->cols - 1 - x1;
 675         else
 676             end_column = start_column + h->cols - 1;
 677     }
 678
 679     /*
 680      * If the position of the page has not moved then we can draw the cursor
 681      * character only.  This will prevent line flicker when using arrow keys.
 682      */
 683     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 684     {
 685         if ((force & REDRAW_PAGE) != 0)
 686         {
 687             row = start_row;
 688             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 689             while (row <= end_row)
 690             {
 691                 if (key_pending (edit))
 692                     return;
 693                 edit_draw_this_line (edit, b, row, start_column, end_column);
 694                 b = edit_move_forward (edit, b, 1, 0);
 695                 row++;
 696             }
 697         }
 698         else
 699         {
 700             curs_row = edit->curs_row;
 701
 702             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 703             {
 704                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 705
 706                 row = start_row;
 707                 b = edit->start_display;
 708                 while (row <= upto)
 709                 {
 710                     if (key_pending (edit))
 711                         return;
 712                     edit_draw_this_line (edit, b, row, start_column, end_column);
 713                     b = edit_move_forward (edit, b, 1, 0);
 714                 }
 715             }
 716
 717             /*          if (force & REDRAW_LINE)          ---> default */
 718             b = edit_bol (edit, edit->curs1);
 719             if (curs_row >= start_row && curs_row <= end_row)
 720             {
 721                 if (key_pending (edit))
 722                     return;
 723                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 724             }
 725
 726             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 727             {
 728                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 729                 b = edit_move_forward (edit, b, 1, 0);
 730                 while (row <= end_row)
 731                 {
 732                     if (key_pending (edit))
 733                         return;
 734                     edit_draw_this_line (edit, b, row, start_column, end_column);
 735                     b = edit_move_forward (edit, b, 1, 0);
 736                     row++;
 737                 }
 738             }
 739
 740             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 741             {
 742                 row = curs_row - 1;
 743                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 744                 if (row >= start_row && row <= end_row)
 745                 {
 746                     if (key_pending (edit))
 747                         return;
 748                     edit_draw_this_line (edit, b, row, start_column, end_column);
 749                 }
 750             }
 751
 752             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 753             {
 754                 row = curs_row + 1;
 755                 b = edit_bol (edit, edit->curs1);
 756                 b = edit_move_forward (edit, b, 1, 0);
 757                 if (row >= start_row && row <= end_row)
 758                 {
 759                     if (key_pending (edit))
 760                         return;
 761                     edit_draw_this_line (edit, b, row, start_column, end_column);
 762                 }
 763             }
 764         }
 765     }
 766     else if (prev_curs_row < edit->curs_row)
 767     {
 768         /* with the new text highlighting, we must draw from the top down */
 769         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 770         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 771     }
 772     else
 773     {
 774         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 775         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 776     }
 777
 778     edit->force = 0;
 779
 780     prev_curs_row = edit->curs_row;
 781     prev_curs = edit->curs1;
 782 }
 783
 784 /* --------------------------------------------------------------------------------------------- */
 785
 786 static inline void
 787 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 788 {
 789     if (page)                   /* if it was an expose event, 'page' would be set */
 790         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 791
 792     if (edit->force & REDRAW_COMPLETELY)
 793         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 794     render_edit_text (edit, row_start, col_start, row_end, col_end);
 795     /*
 796      * edit->force != 0 means a key was pending and the redraw
 797      * was halted, so next time we must redraw everything in case stuff
 798      * was left undrawn from a previous key press.
 799      */
 800     if (edit->force)
 801         edit->force |= REDRAW_PAGE;
 802 }
 803
 804 /* --------------------------------------------------------------------------------------------- */
 805 /*** public functions ****************************************************************************/
 806 /* --------------------------------------------------------------------------------------------- */
 807
 808 /** Draw the status line at the top of the screen. The size of the filename
 809  * field varies depending on the width of the screen and the length of
 810  * the filename. */
 811 void
 812 edit_status (WEdit * edit)
 813 {
 814     const int w = edit->widget.owner->cols;
 815     const size_t status_size = w + 1;
 816     char *const status = g_malloc (status_size);
 817     int status_len;
 818     const char *fname = "";
 819     int fname_len;
 820     const int gap = 3;          /* between the filename and the status */
 821     const int right_gap = 5;    /* at the right end of the screen */
 822     const int preferred_fname_len = 16;
 823
 824     status_string (edit, status, status_size);
 825     status_len = (int) str_term_width1 (status);
 826
 827     if (edit->filename_vpath != NULL)
 828         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 829
 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 /* --------------------------------------------------------------------------------------------- */