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 "editwidget.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     i = 1;
 248     for (p = line; p->ch != 0; p++)
 249     {
 250         int style;
 251         unsigned int textchar;
 252         int color;
 253
 254         if (cols_to_skip != 0)
 255         {
 256             cols_to_skip--;
 257             continue;
 258         }
 259
 260         style = p->style & 0xFF00;
 261         textchar = p->ch;
 262         color = p->style >> 16;
 263
 264         if (style & MOD_ABNORMAL)
 265         {
 266             /* Non-printable - use black background */
 267             color = 0;
 268         }
 269
 270         if (style & MOD_WHITESPACE)
 271         {
 272             if (style & MOD_MARKED)
 273             {
 274                 textchar = ' ';
 275                 tty_setcolor (EDITOR_MARKED_COLOR);
 276             }
 277             else
 278                 tty_setcolor (EDITOR_WHITESPACE_COLOR);
 279         }
 280         else if (style & MOD_BOLD)
 281             tty_setcolor (EDITOR_BOLD_COLOR);
 282         else if (style & MOD_MARKED)
 283             tty_setcolor (EDITOR_MARKED_COLOR);
 284         else
 285             tty_lowlevel_setcolor (color);
 286
 287         if (show_right_margin)
 288         {
 289             if (i > option_word_wrap_line_length + edit->start_col)
 290                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 291             i++;
 292         }
 293
 294         tty_print_anychar (textchar);
 295     }
 296 }
 297
 298 /* --------------------------------------------------------------------------------------------- */
 299 /** b is a pointer to the beginning of the line */
 300
 301 static void
 302 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 303 {
 304     struct line_s line[MAX_LINE_LEN];
 305     struct line_s *p = line;
 306
 307     long m1 = 0, m2 = 0, q, c1, c2;
 308     int col, start_col_real;
 309     unsigned int c;
 310     int color;
 311     int abn_style;
 312     int i;
 313     int utf8lag = 0;
 314     unsigned int cur_line = 0;
 315     int book_mark = 0;
 316     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 317
 318     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 319         return;
 320
 321     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 322         book_mark = BOOK_MARK_COLOR;
 323     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 324         book_mark = BOOK_MARK_FOUND_COLOR;
 325
 326     if (book_mark)
 327         abn_style = book_mark << 16;
 328     else
 329         abn_style = MOD_ABNORMAL;
 330
 331     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 332
 333     edit_get_syntax_color (edit, b - 1, &color);
 334     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 335     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 336
 337     if (option_line_state)
 338     {
 339         cur_line = edit->start_line + row;
 340         if (cur_line <= (unsigned int) edit->total_lines)
 341         {
 342             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 343         }
 344         else
 345         {
 346             memset (line_stat, ' ', LINE_STATE_WIDTH);
 347             line_stat[LINE_STATE_WIDTH] = '\0';
 348         }
 349         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 350         {
 351             g_snprintf (line_stat, 2, "*");
 352         }
 353     }
 354
 355     if (col + 16 > -edit->start_col)
 356     {
 357         eval_marks (edit, &m1, &m2);
 358
 359         if (row <= edit->total_lines - edit->start_line)
 360         {
 361             long tws = 0;
 362             if (tty_use_colors () && visible_tws)
 363             {
 364                 tws = edit_eol (edit, b);
 365                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 366                     tws--;
 367             }
 368
 369             while (col <= end_col - edit->start_col)
 370             {
 371                 int cw = 1;
 372                 int tab_over = 0;
 373                 gboolean wide_width_char = FALSE;
 374                 gboolean control_char = FALSE;
 375
 376                 p->ch = 0;
 377                 p->style = 0;
 378                 if (q == edit->curs1)
 379                     p->style |= MOD_CURSOR;
 380                 if (q >= m1 && q < m2)
 381                 {
 382                     if (edit->column_highlight)
 383                     {
 384                         int x;
 385                         x = edit_move_forward3 (edit, b, 0, q);
 386                         c1 = min (edit->column1, edit->column2);
 387                         c2 = max (edit->column1, edit->column2);
 388                         if (x >= c1 && x < c2)
 389                             p->style |= MOD_MARKED;
 390                     }
 391                     else
 392                         p->style |= MOD_MARKED;
 393                 }
 394                 if (q == edit->bracket)
 395                     p->style |= MOD_BOLD;
 396                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 397                     p->style |= MOD_BOLD;
 398
 399                 if (!edit->utf8)
 400                 {
 401                     c = edit_get_byte (edit, q);
 402                 }
 403                 else
 404                 {
 405                     c = edit_get_utf (edit, q, &cw);
 406                 }
 407                 /* we don't use bg for mc - fg contains both */
 408                 if (book_mark)
 409                 {
 410                     p->style |= book_mark << 16;
 411                 }
 412                 else
 413                 {
 414                     edit_get_syntax_color (edit, q, &color);
 415                     p->style |= color << 16;
 416                 }
 417                 switch (c)
 418                 {
 419                 case '\n':
 420                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 421                     break;
 422                 case '\t':
 423                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 424                     tab_over = (end_col - edit->start_col) - (col + i - 1);
 425                     if (tab_over < 0)
 426                         i += tab_over;
 427                     col += i;
 428                     if (tty_use_colors () &&
 429                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 430                     {
 431                         if (p->style & MOD_MARKED)
 432                             c = p->style;
 433                         else if (book_mark)
 434                             c |= book_mark << 16;
 435                         else
 436                             c = p->style | MOD_WHITESPACE;
 437                         if (i > 2)
 438                         {
 439                             p->ch = '<';
 440                             p->style = c;
 441                             p++;
 442                             while (--i > 1)
 443                             {
 444                                 p->ch = '-';
 445                                 p->style = c;
 446                                 p++;
 447                             }
 448                             p->ch = '>';
 449                             p->style = c;
 450                             p++;
 451                         }
 452                         else if (i > 1)
 453                         {
 454                             p->ch = '<';
 455                             p->style = c;
 456                             p++;
 457                             p->ch = '>';
 458                             p->style = c;
 459                             p++;
 460                         }
 461                         else
 462                         {
 463                             p->ch = '>';
 464                             p->style = c;
 465                             p++;
 466                         }
 467                     }
 468                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 469                     {
 470                         p->ch = '.';
 471                         p->style |= MOD_WHITESPACE;
 472                         c = p->style & ~MOD_CURSOR;
 473                         p++;
 474                         while (--i)
 475                         {
 476                             p->ch = ' ';
 477                             p->style = c;
 478                             p++;
 479                         }
 480                     }
 481                     else
 482                     {
 483                         p->ch |= ' ';
 484                         c = p->style & ~MOD_CURSOR;
 485                         p++;
 486                         while (--i)
 487                         {
 488                             p->ch = ' ';
 489                             p->style = c;
 490                             p++;
 491                         }
 492                     }
 493                     break;
 494                 case ' ':
 495                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 496                     {
 497                         p->ch = '.';
 498                         p->style |= MOD_WHITESPACE;
 499                         p++;
 500                         col++;
 501                         break;
 502                     }
 503                     /* fallthrough */
 504                 default:
 505 #ifdef HAVE_CHARSET
 506                     if (mc_global.utf8_display)
 507                     {
 508                         if (!edit->utf8)
 509                         {
 510                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 511                         }
 512                         else
 513                         {
 514                             if (g_unichar_iswide (c))
 515                             {
 516                                 wide_width_char = TRUE;
 517                                 col++;
 518                             }
 519                         }
 520                     }
 521                     else if (edit->utf8)
 522                         c = convert_from_utf_to_current_c (c, edit->converter);
 523                     else
 524 #endif
 525                         c = convert_to_display_c (c);
 526
 527                     /* Caret notation for control characters */
 528                     if (c < 32)
 529                     {
 530                         p->ch = '^';
 531                         p->style = abn_style;
 532                         p++;
 533                         p->ch = c + 0x40;
 534                         p->style = abn_style;
 535                         p++;
 536                         col += 2;
 537                         control_char = TRUE;
 538                         break;
 539                     }
 540                     if (c == 127)
 541                     {
 542                         p->ch = '^';
 543                         p->style = abn_style;
 544                         p++;
 545                         p->ch = '?';
 546                         p->style = abn_style;
 547                         p++;
 548                         col += 2;
 549                         control_char = TRUE;
 550                         break;
 551                     }
 552                     if (!edit->utf8)
 553                     {
 554                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 555                             (!mc_global.utf8_display && is_printable (c)))
 556                         {
 557                             p->ch = c;
 558                             p++;
 559                         }
 560                         else
 561                         {
 562                             p->ch = '.';
 563                             p->style = abn_style;
 564                             p++;
 565                         }
 566                     }
 567                     else
 568                     {
 569                         if (g_unichar_isprint (c))
 570                         {
 571                             p->ch = c;
 572                             p++;
 573                         }
 574                         else
 575                         {
 576                             p->ch = '.';
 577                             p->style = abn_style;
 578                             p++;
 579                         }
 580                     }
 581                     col++;
 582                     break;
 583                 }               /* case */
 584
 585                 q++;
 586                 if (cw > 1)
 587                 {
 588                     q += cw - 1;
 589                 }
 590
 591                 if (col > (end_col - edit->start_col + 1))
 592                 {
 593                     if (wide_width_char)
 594                     {
 595                         p--;
 596                         break;
 597                     }
 598                     if (control_char)
 599                     {
 600                         p -= 2;
 601                         break;
 602                     }
 603                 }
 604             }
 605         }
 606     }
 607     else
 608     {
 609         start_col_real = start_col = 0;
 610     }
 611
 612     p->ch = 0;
 613
 614     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 615 }
 616
 617 /* --------------------------------------------------------------------------------------------- */
 618
 619 static inline void
 620 edit_draw_this_char (WEdit * edit, long curs, long row, long start_column, long end_column)
 621 {
 622     int b = edit_bol (edit, curs);
 623     edit_draw_this_line (edit, b, row, start_column, end_column);
 624 }
 625
 626 /* --------------------------------------------------------------------------------------------- */
 627 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 628
 629 static inline void
 630 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 631 {
 632     static long prev_curs_row = 0;
 633     static long prev_curs = 0;
 634
 635     Widget *w = (Widget *) edit;
 636     Dlg_head *h = w->owner;
 637
 638     long row = 0, curs_row;
 639     int force = edit->force;
 640     long b;
 641     int y1, x1, y2, x2;
 642
 643     int last_line;
 644     int last_column;
 645
 646     /* draw only visible region */
 647
 648     last_line = h->y + h->lines - 1;
 649
 650     y1 = w->y;
 651     if (y1 > last_line - 1 /* buttonbar */ )
 652         return;
 653
 654     last_column = h->x + h->cols - 1;
 655
 656     x1 = w->x;
 657     if (x1 > last_column)
 658         return;
 659
 660     y2 = w->y + w->lines - 1;
 661     if (y2 < h->y + 1 /* menubar */ )
 662         return;
 663
 664     x2 = w->x + w->cols - 1;
 665     if (x2 < h->x)
 666         return;
 667
 668     if ((force & REDRAW_IN_BOUNDS) == 0)
 669     {
 670         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 671         /* draw only visible region */
 672
 673         if (y2 <= last_line - 1 /* buttonbar */ )
 674             end_row = w->lines - 1;
 675         else if (y1 >= h->y + 1 /* menubar */ )
 676             end_row = h->lines - 1 - y1 - 1;
 677         else
 678             end_row = start_row + h->lines - 1 - 1;
 679
 680         if (x2 <= last_column)
 681             end_column = w->cols - 1;
 682         else if (x1 >= h->x)
 683             end_column = h->cols - 1 - x1;
 684         else
 685             end_column = start_column + h->cols - 1;
 686     }
 687
 688     /*
 689      * If the position of the page has not moved then we can draw the cursor
 690      * character only.  This will prevent line flicker when using arrow keys.
 691      */
 692     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 693     {
 694         if ((force & REDRAW_PAGE) != 0)
 695         {
 696             row = start_row;
 697             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 698             while (row <= end_row)
 699             {
 700                 if (key_pending (edit))
 701                     return;
 702                 edit_draw_this_line (edit, b, row, start_column, end_column);
 703                 b = edit_move_forward (edit, b, 1, 0);
 704                 row++;
 705             }
 706         }
 707         else
 708         {
 709             curs_row = edit->curs_row;
 710
 711             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 712             {
 713                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 714
 715                 row = start_row;
 716                 b = edit->start_display;
 717                 while (row <= upto)
 718                 {
 719                     if (key_pending (edit))
 720                         return;
 721                     edit_draw_this_line (edit, b, row, start_column, end_column);
 722                     b = edit_move_forward (edit, b, 1, 0);
 723                 }
 724             }
 725
 726             /*          if (force & REDRAW_LINE)          ---> default */
 727             b = edit_bol (edit, edit->curs1);
 728             if (curs_row >= start_row && curs_row <= end_row)
 729             {
 730                 if (key_pending (edit))
 731                     return;
 732                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 733             }
 734
 735             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 736             {
 737                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 738                 b = edit_move_forward (edit, b, 1, 0);
 739                 while (row <= end_row)
 740                 {
 741                     if (key_pending (edit))
 742                         return;
 743                     edit_draw_this_line (edit, b, row, start_column, end_column);
 744                     b = edit_move_forward (edit, b, 1, 0);
 745                     row++;
 746                 }
 747             }
 748
 749             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 750             {
 751                 row = curs_row - 1;
 752                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 753                 if (row >= start_row && row <= end_row)
 754                 {
 755                     if (key_pending (edit))
 756                         return;
 757                     edit_draw_this_line (edit, b, row, start_column, end_column);
 758                 }
 759             }
 760
 761             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 762             {
 763                 row = curs_row + 1;
 764                 b = edit_bol (edit, edit->curs1);
 765                 b = edit_move_forward (edit, b, 1, 0);
 766                 if (row >= start_row && row <= end_row)
 767                 {
 768                     if (key_pending (edit))
 769                         return;
 770                     edit_draw_this_line (edit, b, row, start_column, end_column);
 771                 }
 772             }
 773         }
 774     }
 775     else if (prev_curs_row < edit->curs_row)
 776     {
 777         /* with the new text highlighting, we must draw from the top down */
 778         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 779         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 780     }
 781     else
 782     {
 783         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 784         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 785     }
 786
 787     edit->force = 0;
 788
 789     prev_curs_row = edit->curs_row;
 790     prev_curs = edit->curs1;
 791 }
 792
 793 /* --------------------------------------------------------------------------------------------- */
 794
 795 static inline void
 796 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 797 {
 798     if (page)                   /* if it was an expose event, 'page' would be set */
 799         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 800
 801     if (edit->force & REDRAW_COMPLETELY)
 802         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 803     render_edit_text (edit, row_start, col_start, row_end, col_end);
 804     /*
 805      * edit->force != 0 means a key was pending and the redraw
 806      * was halted, so next time we must redraw everything in case stuff
 807      * was left undrawn from a previous key press.
 808      */
 809     if (edit->force)
 810         edit->force |= REDRAW_PAGE;
 811 }
 812
 813 /* --------------------------------------------------------------------------------------------- */
 814 /*** public functions ****************************************************************************/
 815 /* --------------------------------------------------------------------------------------------- */
 816
 817 /** Draw the status line at the top of the screen. The size of the filename
 818  * field varies depending on the width of the screen and the length of
 819  * the filename. */
 820 void
 821 edit_status (WEdit * edit)
 822 {
 823     const int w = edit->widget.owner->cols;
 824     const size_t status_size = w + 1;
 825     char *const status = g_malloc (status_size);
 826     int status_len;
 827     const char *fname = "";
 828     int fname_len;
 829     const int gap = 3;          /* between the filename and the status */
 830     const int right_gap = 5;    /* at the right end of the screen */
 831     const int preferred_fname_len = 16;
 832
 833     status_string (edit, status, status_size);
 834     status_len = (int) str_term_width1 (status);
 835
 836     if (edit->filename_vpath != NULL)
 837         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 838
 839     fname_len = str_term_width1 (fname);
 840     if (fname_len < preferred_fname_len)
 841         fname_len = preferred_fname_len;
 842
 843     if (fname_len + gap + status_len + right_gap >= w)
 844     {
 845         if (preferred_fname_len + gap + status_len + right_gap >= w)
 846             fname_len = preferred_fname_len;
 847         else
 848             fname_len = w - (gap + status_len + right_gap);
 849         fname = str_trunc (fname, fname_len);
 850     }
 851
 852     dlg_move (edit->widget.owner, 0, 0);
 853     tty_setcolor (STATUSBAR_COLOR);
 854     printwstr (fname, fname_len + gap);
 855     printwstr (status, w - (fname_len + gap));
 856
 857     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 858     {
 859         size_t percent = 100;
 860
 861         if (edit->total_lines + 1 != 0)
 862             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 863         dlg_move (edit->widget.owner, 0, w - 5);
 864         tty_printf (" %3d%%", percent);
 865     }
 866
 867     g_free (status);
 868 }
 869
 870 /* --------------------------------------------------------------------------------------------- */
 871 /** this scrolls the text so that cursor is on the screen */
 872 void
 873 edit_scroll_screen_over_cursor (WEdit * edit)
 874 {
 875     int p;
 876     int outby;
 877     int b_extreme, t_extreme, l_extreme, r_extreme;
 878
 879     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 880         return;
 881
 882     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 883     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 884
 885     r_extreme = EDIT_RIGHT_EXTREME;
 886     l_extreme = EDIT_LEFT_EXTREME;
 887     b_extreme = EDIT_BOTTOM_EXTREME;
 888     t_extreme = EDIT_TOP_EXTREME;
 889     if (edit->found_len)
 890     {
 891         b_extreme = max (edit->widget.lines / 4, b_extreme);
 892         t_extreme = max (edit->widget.lines / 4, t_extreme);
 893     }
 894     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 895     {
 896         int n;
 897
 898         n = b_extreme + t_extreme;
 899         if (n == 0)
 900             n = 1;
 901         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 902         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 903     }
 904     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 905     {
 906         int n;
 907
 908         n = l_extreme + t_extreme;
 909         if (n == 0)
 910             n = 1;
 911         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 912         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 913     }
 914     p = edit_get_col (edit) + edit->over_col;
 915     edit_update_curs_row (edit);
 916     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 917     if (outby > 0)
 918         edit_scroll_right (edit, outby);
 919     outby = l_extreme - p - edit->start_col;
 920     if (outby > 0)
 921         edit_scroll_left (edit, outby);
 922     p = edit->curs_row;
 923     outby = p - edit->widget.lines + 1 + b_extreme;
 924     if (outby > 0)
 925         edit_scroll_downward (edit, outby);
 926     outby = t_extreme - p;
 927     if (outby > 0)
 928         edit_scroll_upward (edit, outby);
 929     edit_update_curs_row (edit);
 930
 931     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 932     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 933 }
 934
 935 /* --------------------------------------------------------------------------------------------- */
 936
 937 void
 938 edit_render_keypress (WEdit * edit)
 939 {
 940     edit_render (edit, 0, 0, 0, 0, 0);
 941 }
 942
 943 /* --------------------------------------------------------------------------------------------- */