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 #include "lib/charsets.h"
  52
  53 #include "src/setup.h"          /* edit_tab_spacing */
  54 #include "src/main.h"           /* macro_index */
  55
  56 #include "edit-impl.h"
  57 #include "edit-widget.h"
  58
  59 /*** global variables ****************************************************************************/
  60
  61 /* Toggles statusbar draw style */
  62 int simple_statusbar = 0;
  63
  64 int visible_tabs = 1, visible_tws = 1;
  65
  66 /*** file scope macro definitions ****************************************************************/
  67
  68 #define MAX_LINE_LEN 1024
  69
  70 /* Text styles */
  71 #define MOD_ABNORMAL            (1 << 8)
  72 #define MOD_BOLD                (1 << 9)
  73 #define MOD_MARKED              (1 << 10)
  74 #define MOD_CURSOR              (1 << 11)
  75 #define MOD_WHITESPACE          (1 << 12)
  76
  77 #define edit_move(x,y) widget_move(edit, y, x);
  78
  79 #define key_pending(x) (!is_idle())
  80
  81 #define EDITOR_MINIMUM_TERMINAL_WIDTH 30
  82
  83 /*** file scope type declarations ****************************************************************/
  84
  85 struct line_s
  86 {
  87     unsigned int ch;
  88     unsigned int style;
  89 };
  90
  91 /*** file scope variables ************************************************************************/
  92
  93 /*** file scope functions ************************************************************************/
  94 /* --------------------------------------------------------------------------------------------- */
  95
  96 static inline void
  97 status_string (WEdit * edit, char *s, int w)
  98 {
  99     char byte_str[16];
 100     unsigned char cur_byte = 0;
 101     unsigned int cur_utf = 0;
 102     int cw = 1;
 103
 104     /*
 105      * If we are at the end of file, print <EOF>,
 106      * otherwise print the current character as is (if printable),
 107      * as decimal and as hex.
 108      */
 109     if (edit->curs1 < edit->last_byte)
 110     {
 111         if (!edit->utf8)
 112         {
 113             cur_byte = edit_get_byte (edit, edit->curs1);
 114
 115             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 116                         (int) cur_byte, (unsigned) cur_byte);
 117         }
 118         else
 119         {
 120             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 121             if (cw > 0)
 122             {
 123                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 124                             (unsigned) cur_utf, (unsigned) cur_utf);
 125             }
 126             else
 127             {
 128                 cur_utf = edit_get_byte (edit, edit->curs1);
 129                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 130                             (int) cur_utf, (unsigned) cur_utf);
 131             }
 132
 133         }
 134     }
 135     else
 136     {
 137         strcpy (byte_str, "<EOF>     ");
 138     }
 139
 140     /* The field lengths just prevent the status line from shortening too much */
 141     if (simple_statusbar)
 142         g_snprintf (s, w,
 143                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 144                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 145                     edit->modified ? 'M' : '-',
 146                     macro_index < 0 ? '-' : 'R',
 147                     edit->overwrite == 0 ? '-' : 'O',
 148                     edit->curs_col + edit->over_col,
 149                     edit->curs_line + 1,
 150                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 151 #ifdef HAVE_CHARSET
 152                     mc_global.source_codepage >=
 153                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 154 #else
 155                     ""
 156 #endif
 157             );
 158     else
 159         g_snprintf (s, w,
 160                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 161                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 162                     edit->modified ? 'M' : '-',
 163                     macro_index < 0 ? '-' : 'R',
 164                     edit->overwrite == 0 ? '-' : 'O',
 165                     edit->curs_col + edit->over_col,
 166                     edit->start_line + 1,
 167                     edit->curs_row,
 168                     edit->curs_line + 1,
 169                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 170 #ifdef HAVE_CHARSET
 171                     mc_global.source_codepage >=
 172                     0 ? get_codepage_id (mc_global.source_codepage) : ""
 173 #else
 174                     ""
 175 #endif
 176             );
 177 }
 178
 179 /* --------------------------------------------------------------------------------------------- */
 180
 181 static inline void
 182 printwstr (const char *s, int len)
 183 {
 184     if (len > 0)
 185         tty_printf ("%-*.*s", len, len, s);
 186 }
 187
 188 /* --------------------------------------------------------------------------------------------- */
 189
 190 static inline void
 191 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 192                  long end_col, struct line_s line[], char *status, int bookmarked)
 193 {
 194     struct line_s *p;
 195
 196     int x = start_col_real;
 197     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 198     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 199     int cols_to_skip = abs (x);
 200     int i;
 201     int wrap_start;
 202     int len;
 203
 204     tty_setcolor (EDITOR_NORMAL_COLOR);
 205     if (bookmarked != 0)
 206         tty_setcolor (bookmarked);
 207
 208     len = end_col + 1 - start_col;
 209     wrap_start = option_word_wrap_line_length + edit->start_col;
 210
 211     if (len > 0 && edit->widget.y + y >= 0)
 212     {
 213         if (!show_right_margin || wrap_start > end_col)
 214             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 215         else if (wrap_start < 0)
 216         {
 217             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 218             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 219         }
 220         else
 221         {
 222             if (wrap_start > 0)
 223                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', wrap_start);
 224
 225             len -= wrap_start;
 226             if (len > 0)
 227             {
 228                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 229                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1 + wrap_start, ' ', len);
 230             }
 231         }
 232     }
 233
 234     if (option_line_state)
 235     {
 236         tty_setcolor (LINE_STATE_COLOR);
 237         for (i = 0; i < LINE_STATE_WIDTH; i++)
 238         {
 239             edit_move (x1 + i - option_line_state_width, y);
 240             if (status[i] == '\0')
 241                 status[i] = ' ';
 242             tty_print_char (status[i]);
 243         }
 244     }
 245
 246     edit_move (x1, y);
 247     p = line;
 248     i = 1;
 249     while (p->ch)
 250     {
 251         int style;
 252         unsigned int textchar;
 253         int color;
 254
 255         if (cols_to_skip)
 256         {
 257             p++;
 258             cols_to_skip--;
 259             continue;
 260         }
 261
 262         style = p->style & 0xFF00;
 263         textchar = p->ch;
 264         color = p->style >> 16;
 265
 266         if (style & MOD_ABNORMAL)
 267         {
 268             /* Non-printable - use black background */
 269             color = 0;
 270         }
 271
 272         if (style & MOD_WHITESPACE)
 273         {
 274             if (style & MOD_MARKED)
 275             {
 276                 textchar = ' ';
 277                 tty_setcolor (EDITOR_MARKED_COLOR);
 278             }
 279             else
 280             {
 281 #if 0
 282                 if (color != EDITOR_NORMAL_COLOR)
 283                 {
 284                     textchar = ' ';
 285                     tty_lowlevel_setcolor (color);
 286                 }
 287                 else
 288 #endif
 289                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 290             }
 291         }
 292         else
 293         {
 294             if (style & MOD_BOLD)
 295             {
 296                 tty_setcolor (EDITOR_BOLD_COLOR);
 297             }
 298             else if (style & MOD_MARKED)
 299             {
 300                 tty_setcolor (EDITOR_MARKED_COLOR);
 301             }
 302             else
 303             {
 304                 tty_lowlevel_setcolor (color);
 305             }
 306         }
 307         if (show_right_margin)
 308         {
 309             if (i > option_word_wrap_line_length + edit->start_col)
 310                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 311             i++;
 312         }
 313         tty_print_anychar (textchar);
 314         p++;
 315     }
 316 }
 317
 318 /* --------------------------------------------------------------------------------------------- */
 319 /** b is a pointer to the beginning of the line */
 320
 321 static void
 322 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 323 {
 324     struct line_s line[MAX_LINE_LEN];
 325     struct line_s *p = line;
 326
 327     long m1 = 0, m2 = 0, q, c1, c2;
 328     int col, start_col_real;
 329     unsigned int c;
 330     int color;
 331     int abn_style;
 332     int i;
 333     int utf8lag = 0;
 334     unsigned int cur_line = 0;
 335     int book_mark = 0;
 336     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 337
 338     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 339         return;
 340
 341     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 342         book_mark = BOOK_MARK_COLOR;
 343     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 344         book_mark = BOOK_MARK_FOUND_COLOR;
 345
 346     if (book_mark)
 347         abn_style = book_mark << 16;
 348     else
 349         abn_style = MOD_ABNORMAL;
 350
 351     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 352
 353     edit_get_syntax_color (edit, b - 1, &color);
 354     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 355     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 356     if (option_line_state)
 357     {
 358         cur_line = edit->start_line + row;
 359         if (cur_line <= (unsigned int) edit->total_lines)
 360         {
 361             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 362         }
 363         else
 364         {
 365             memset (line_stat, ' ', LINE_STATE_WIDTH);
 366             line_stat[LINE_STATE_WIDTH] = '\0';
 367         }
 368         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 369         {
 370             g_snprintf (line_stat, 2, "*");
 371         }
 372     }
 373
 374     if (col + 16 > -edit->start_col)
 375     {
 376         eval_marks (edit, &m1, &m2);
 377
 378         if (row <= edit->total_lines - edit->start_line)
 379         {
 380             long tws = 0;
 381             if (tty_use_colors () && visible_tws)
 382             {
 383                 tws = edit_eol (edit, b);
 384                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 385                     tws--;
 386             }
 387
 388             while (col <= end_col - edit->start_col)
 389             {
 390                 int cw = 1;
 391
 392                 p->ch = 0;
 393                 p->style = 0;
 394                 if (q == edit->curs1)
 395                     p->style |= MOD_CURSOR;
 396                 if (q >= m1 && q < m2)
 397                 {
 398                     if (edit->column_highlight)
 399                     {
 400                         int x;
 401                         x = edit_move_forward3 (edit, b, 0, q);
 402                         c1 = min (edit->column1, edit->column2);
 403                         c2 = max (edit->column1, edit->column2);
 404                         if (x >= c1 && x < c2)
 405                             p->style |= MOD_MARKED;
 406                     }
 407                     else
 408                         p->style |= MOD_MARKED;
 409                 }
 410                 if (q == edit->bracket)
 411                     p->style |= MOD_BOLD;
 412                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 413                     p->style |= MOD_BOLD;
 414
 415                 if (!edit->utf8)
 416                 {
 417                     c = edit_get_byte (edit, q);
 418                 }
 419                 else
 420                 {
 421                     c = edit_get_utf (edit, q, &cw);
 422                 }
 423                 /* we don't use bg for mc - fg contains both */
 424                 if (book_mark)
 425                 {
 426                     p->style |= book_mark << 16;
 427                 }
 428                 else
 429                 {
 430                     edit_get_syntax_color (edit, q, &color);
 431                     p->style |= color << 16;
 432                 }
 433                 switch (c)
 434                 {
 435                 case '\n':
 436                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 437                     break;
 438                 case '\t':
 439                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 440                     col += i;
 441                     if (tty_use_colors () &&
 442                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 443                     {
 444                         if (p->style & MOD_MARKED)
 445                             c = p->style;
 446                         else if (book_mark)
 447                             c |= book_mark << 16;
 448                         else
 449                             c = p->style | MOD_WHITESPACE;
 450                         if (i > 2)
 451                         {
 452                             p->ch = '<';
 453                             p->style = c;
 454                             p++;
 455                             while (--i > 1)
 456                             {
 457                                 p->ch = '-';
 458                                 p->style = c;
 459                                 p++;
 460                             }
 461                             p->ch = '>';
 462                             p->style = c;
 463                             p++;
 464                         }
 465                         else if (i > 1)
 466                         {
 467                             p->ch = '<';
 468                             p->style = c;
 469                             p++;
 470                             p->ch = '>';
 471                             p->style = c;
 472                             p++;
 473                         }
 474                         else
 475                         {
 476                             p->ch = '>';
 477                             p->style = c;
 478                             p++;
 479                         }
 480                     }
 481                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 482                     {
 483                         p->ch = '.';
 484                         p->style |= MOD_WHITESPACE;
 485                         c = p->style & ~MOD_CURSOR;
 486                         p++;
 487                         while (--i)
 488                         {
 489                             p->ch = ' ';
 490                             p->style = c;
 491                             p++;
 492                         }
 493                     }
 494                     else
 495                     {
 496                         p->ch |= ' ';
 497                         c = p->style & ~MOD_CURSOR;
 498                         p++;
 499                         while (--i)
 500                         {
 501                             p->ch = ' ';
 502                             p->style = c;
 503                             p++;
 504                         }
 505                     }
 506                     break;
 507                 case ' ':
 508                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 509                     {
 510                         p->ch = '.';
 511                         p->style |= MOD_WHITESPACE;
 512                         p++;
 513                         col++;
 514                         break;
 515                     }
 516                     /* fallthrough */
 517                 default:
 518 #ifdef HAVE_CHARSET
 519                     if (mc_global.utf8_display)
 520                     {
 521                         if (!edit->utf8)
 522                         {
 523                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 524                         }
 525                     }
 526                     else if (edit->utf8)
 527                         c = convert_from_utf_to_current_c (c, edit->converter);
 528                     else
 529 #endif
 530                         c = convert_to_display_c (c);
 531
 532                     /* Caret notation for control characters */
 533                     if (c < 32)
 534                     {
 535                         p->ch = '^';
 536                         p->style = abn_style;
 537                         p++;
 538                         p->ch = c + 0x40;
 539                         p->style = abn_style;
 540                         p++;
 541                         col += 2;
 542                         break;
 543                     }
 544                     if (c == 127)
 545                     {
 546                         p->ch = '^';
 547                         p->style = abn_style;
 548                         p++;
 549                         p->ch = '?';
 550                         p->style = abn_style;
 551                         p++;
 552                         col += 2;
 553                         break;
 554                     }
 555                     if (!edit->utf8)
 556                     {
 557                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 558                             (!mc_global.utf8_display && is_printable (c)))
 559                         {
 560                             p->ch = c;
 561                             p++;
 562                         }
 563                         else
 564                         {
 565                             p->ch = '.';
 566                             p->style = abn_style;
 567                             p++;
 568                         }
 569                     }
 570                     else
 571                     {
 572                         if (g_unichar_isprint (c))
 573                         {
 574                             p->ch = c;
 575                             p++;
 576                         }
 577                         else
 578                         {
 579                             p->ch = '.';
 580                             p->style = abn_style;
 581                             p++;
 582                         }
 583                     }
 584                     col++;
 585                     break;
 586                 }               /* case */
 587
 588                 q++;
 589                 if (cw > 1)
 590                 {
 591                     q += cw - 1;
 592                 }
 593             }
 594         }
 595     }
 596     else
 597     {
 598         start_col_real = start_col = 0;
 599     }
 600
 601     p->ch = '\0';
 602
 603     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 604 }
 605
 606 /* --------------------------------------------------------------------------------------------- */
 607
 608 static inline void
 609 edit_draw_this_char (WEdit * edit, long curs, long row, long start_column, long end_column)
 610 {
 611     int b = edit_bol (edit, curs);
 612     edit_draw_this_line (edit, b, row, start_column, end_column);
 613 }
 614
 615 /* --------------------------------------------------------------------------------------------- */
 616 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 617
 618 static inline void
 619 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 620 {
 621     static long prev_curs_row = 0;
 622     static long prev_curs = 0;
 623
 624     Widget *w = (Widget *) edit;
 625     Dlg_head *h = w->owner;
 626
 627     long row = 0, curs_row;
 628     int force = edit->force;
 629     long b;
 630     int y1, x1, y2, x2;
 631
 632     int last_line;
 633     int last_column;
 634
 635     /* draw only visible region */
 636
 637     last_line = h->y + h->lines - 1;
 638
 639     y1 = w->y;
 640     if (y1 > last_line - 1 /* buttonbar */ )
 641         return;
 642
 643     last_column = h->x + h->cols - 1;
 644
 645     x1 = w->x;
 646     if (x1 > last_column)
 647         return;
 648
 649     y2 = w->y + w->lines - 1;
 650     if (y2 < h->y + 1 /* menubar */ )
 651         return;
 652
 653     x2 = w->x + w->cols - 1;
 654     if (x2 < h->x)
 655         return;
 656
 657     if ((force & REDRAW_IN_BOUNDS) == 0)
 658     {
 659         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 660         /* draw only visible region */
 661
 662         if (y2 <= last_line - 1 /* buttonbar */ )
 663             end_row = w->lines - 1;
 664         else if (y1 >= h->y + 1 /* menubar */ )
 665             end_row = h->lines - 1 - y1 - 1;
 666         else
 667             end_row = start_row + h->lines - 1 - 1;
 668
 669         if (x2 <= last_column)
 670             end_column = w->cols - 1;
 671         else if (x1 >= h->x)
 672             end_column = h->cols - 1 - x1;
 673         else
 674             end_column = start_column + h->cols - 1;
 675     }
 676
 677     /*
 678      * If the position of the page has not moved then we can draw the cursor
 679      * character only.  This will prevent line flicker when using arrow keys.
 680      */
 681     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 682     {
 683         if ((force & REDRAW_PAGE) != 0)
 684         {
 685             row = start_row;
 686             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 687             while (row <= end_row)
 688             {
 689                 if (key_pending (edit))
 690                     return;
 691                 edit_draw_this_line (edit, b, row, start_column, end_column);
 692                 b = edit_move_forward (edit, b, 1, 0);
 693                 row++;
 694             }
 695         }
 696         else
 697         {
 698             curs_row = edit->curs_row;
 699
 700             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 701             {
 702                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 703
 704                 row = start_row;
 705                 b = edit->start_display;
 706                 while (row <= upto)
 707                 {
 708                     if (key_pending (edit))
 709                         return;
 710                     edit_draw_this_line (edit, b, row, start_column, end_column);
 711                     b = edit_move_forward (edit, b, 1, 0);
 712                 }
 713             }
 714
 715             /*          if (force & REDRAW_LINE)          ---> default */
 716             b = edit_bol (edit, edit->curs1);
 717             if (curs_row >= start_row && curs_row <= end_row)
 718             {
 719                 if (key_pending (edit))
 720                     return;
 721                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 722             }
 723
 724             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 725             {
 726                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 727                 b = edit_move_forward (edit, b, 1, 0);
 728                 while (row <= end_row)
 729                 {
 730                     if (key_pending (edit))
 731                         return;
 732                     edit_draw_this_line (edit, b, row, start_column, end_column);
 733                     b = edit_move_forward (edit, b, 1, 0);
 734                     row++;
 735                 }
 736             }
 737
 738             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 739             {
 740                 row = curs_row - 1;
 741                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 742                 if (row >= start_row && row <= end_row)
 743                 {
 744                     if (key_pending (edit))
 745                         return;
 746                     edit_draw_this_line (edit, b, row, start_column, end_column);
 747                 }
 748             }
 749
 750             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 751             {
 752                 row = curs_row + 1;
 753                 b = edit_bol (edit, edit->curs1);
 754                 b = edit_move_forward (edit, b, 1, 0);
 755                 if (row >= start_row && row <= end_row)
 756                 {
 757                     if (key_pending (edit))
 758                         return;
 759                     edit_draw_this_line (edit, b, row, start_column, end_column);
 760                 }
 761             }
 762         }
 763     }
 764     else if (prev_curs_row < edit->curs_row)
 765     {
 766         /* with the new text highlighting, we must draw from the top down */
 767         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 768         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 769     }
 770     else
 771     {
 772         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 773         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 774     }
 775
 776     edit->force = 0;
 777
 778     prev_curs_row = edit->curs_row;
 779     prev_curs = edit->curs1;
 780 }
 781
 782 /* --------------------------------------------------------------------------------------------- */
 783
 784 static inline void
 785 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 786 {
 787     if (page)                   /* if it was an expose event, 'page' would be set */
 788         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 789
 790     if (edit->force & REDRAW_COMPLETELY)
 791         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 792     render_edit_text (edit, row_start, col_start, row_end, col_end);
 793     /*
 794      * edit->force != 0 means a key was pending and the redraw
 795      * was halted, so next time we must redraw everything in case stuff
 796      * was left undrawn from a previous key press.
 797      */
 798     if (edit->force)
 799         edit->force |= REDRAW_PAGE;
 800 }
 801
 802 /* --------------------------------------------------------------------------------------------- */
 803 /*** public functions ****************************************************************************/
 804 /* --------------------------------------------------------------------------------------------- */
 805
 806 /** Draw the status line at the top of the screen. The size of the filename
 807  * field varies depending on the width of the screen and the length of
 808  * the filename. */
 809 void
 810 edit_status (WEdit * edit)
 811 {
 812     const int w = edit->widget.owner->cols;
 813     const size_t status_size = w + 1;
 814     char *const status = g_malloc (status_size);
 815     int status_len;
 816     const char *fname = "";
 817     int fname_len;
 818     const int gap = 3;          /* between the filename and the status */
 819     const int right_gap = 5;    /* at the right end of the screen */
 820     const int preferred_fname_len = 16;
 821
 822     status_string (edit, status, status_size);
 823     status_len = (int) str_term_width1 (status);
 824
 825     if (edit->filename_vpath != NULL)
 826         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 827
 828     fname_len = str_term_width1 (fname);
 829     if (fname_len < preferred_fname_len)
 830         fname_len = preferred_fname_len;
 831
 832     if (fname_len + gap + status_len + right_gap >= w)
 833     {
 834         if (preferred_fname_len + gap + status_len + right_gap >= w)
 835             fname_len = preferred_fname_len;
 836         else
 837             fname_len = w - (gap + status_len + right_gap);
 838         fname = str_trunc (fname, fname_len);
 839     }
 840
 841     dlg_move (edit->widget.owner, 0, 0);
 842     tty_setcolor (STATUSBAR_COLOR);
 843     printwstr (fname, fname_len + gap);
 844     printwstr (status, w - (fname_len + gap));
 845
 846     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 847     {
 848         size_t percent = 100;
 849
 850         if (edit->total_lines + 1 != 0)
 851             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 852         dlg_move (edit->widget.owner, 0, w - 5);
 853         tty_printf (" %3d%%", percent);
 854     }
 855
 856     g_free (status);
 857 }
 858
 859 /* --------------------------------------------------------------------------------------------- */
 860 /** this scrolls the text so that cursor is on the screen */
 861 void
 862 edit_scroll_screen_over_cursor (WEdit * edit)
 863 {
 864     int p;
 865     int outby;
 866     int b_extreme, t_extreme, l_extreme, r_extreme;
 867
 868     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 869         return;
 870
 871     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 872     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 873
 874     r_extreme = EDIT_RIGHT_EXTREME;
 875     l_extreme = EDIT_LEFT_EXTREME;
 876     b_extreme = EDIT_BOTTOM_EXTREME;
 877     t_extreme = EDIT_TOP_EXTREME;
 878     if (edit->found_len)
 879     {
 880         b_extreme = max (edit->widget.lines / 4, b_extreme);
 881         t_extreme = max (edit->widget.lines / 4, t_extreme);
 882     }
 883     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 884     {
 885         int n;
 886
 887         n = b_extreme + t_extreme;
 888         if (n == 0)
 889             n = 1;
 890         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 891         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 892     }
 893     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 894     {
 895         int n;
 896
 897         n = l_extreme + t_extreme;
 898         if (n == 0)
 899             n = 1;
 900         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 901         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 902     }
 903     p = edit_get_col (edit) + edit->over_col;
 904     edit_update_curs_row (edit);
 905     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 906     if (outby > 0)
 907         edit_scroll_right (edit, outby);
 908     outby = l_extreme - p - edit->start_col;
 909     if (outby > 0)
 910         edit_scroll_left (edit, outby);
 911     p = edit->curs_row;
 912     outby = p - edit->widget.lines + 1 + b_extreme;
 913     if (outby > 0)
 914         edit_scroll_downward (edit, outby);
 915     outby = t_extreme - p;
 916     if (outby > 0)
 917         edit_scroll_upward (edit, outby);
 918     edit_update_curs_row (edit);
 919
 920     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 921     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 922 }
 923
 924 /* --------------------------------------------------------------------------------------------- */
 925
 926 void
 927 edit_render_keypress (WEdit * edit)
 928 {
 929     edit_render (edit, 0, 0, 0, 0, 0);
 930 }
 931
 932 /* --------------------------------------------------------------------------------------------- */