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
 103     /*
 104      * If we are at the end of file, print <EOF>,
 105      * otherwise print the current character as is (if printable),
 106      * as decimal and as hex.
 107      */
 108     if (edit->curs1 < edit->last_byte)
 109     {
 110         unsigned char cur_byte = 0;
 111
 112 #ifdef HAVE_CHARSET
 113         int cw = 1;
 114
 115         if (!edit->utf8)
 116         {
 117             cur_byte = edit_get_byte (edit, edit->curs1);
 118
 119             g_snprintf (byte_str, sizeof (byte_str), "%4d 0x%03X",
 120                         (int) cur_byte, (unsigned) cur_byte);
 121         }
 122         else
 123         {
 124             unsigned int cur_utf = 0;
 125
 126             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 127             if (cw > 0)
 128             {
 129                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 130                             (unsigned) cur_utf, (unsigned) cur_utf);
 131             }
 132             else
 133 #endif
 134             {
 135                 cur_byte = edit_get_byte (edit, edit->curs1);
 136                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 137                             (int) cur_byte, (unsigned) cur_utf);
 138             }
 139         }
 140     }
 141     else
 142     {
 143         strcpy (byte_str, "<EOF>     ");
 144     }
 145
 146     /* The field lengths just prevent the status line from shortening too much */
 147     if (simple_statusbar)
 148         g_snprintf (s, w,
 149                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 150                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 151                     edit->modified ? 'M' : '-',
 152                     macro_index < 0 ? '-' : 'R',
 153                     edit->overwrite == 0 ? '-' : 'O',
 154                     edit->curs_col + edit->over_col,
 155                     edit->curs_line + 1,
 156                     edit->total_lines + 1, (long) edit->curs1, (long) edit->last_byte, byte_str,
 157 #ifdef HAVE_CHARSET
 158                     mc_global.source_codepage >=
 159                     0 ? get_codepage_id (mc_global.source_codepage) :
 160 #endif
 161                     ""
 162             );
 163     else
 164         g_snprintf (s, w,
 165                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 166                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 167                     edit->modified ? 'M' : '-',
 168                     macro_index < 0 ? '-' : 'R',
 169                     edit->overwrite == 0 ? '-' : 'O',
 170                     edit->curs_col + edit->over_col,
 171                     edit->start_line + 1,
 172                     edit->curs_row,
 173                     edit->curs_line + 1,
 174                     edit->total_lines + 1, (long) edit->curs1, (long) edit->last_byte, byte_str,
 175 #ifdef HAVE_CHARSET
 176                     mc_global.source_codepage >=
 177                     0 ? get_codepage_id (mc_global.source_codepage) :
 178 #endif
 179                     ""
 180             );
 181 }
 182
 183 /* --------------------------------------------------------------------------------------------- */
 184
 185 static inline void
 186 printwstr (const char *s, int len)
 187 {
 188     if (len > 0)
 189         tty_printf ("%-*.*s", len, len, s);
 190 }
 191
 192 /* --------------------------------------------------------------------------------------------- */
 193
 194 static inline void
 195 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 196                  long end_col, struct line_s line[], char *status, int bookmarked)
 197 {
 198     struct line_s *p;
 199
 200     int x = start_col_real;
 201     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 202     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 203     int cols_to_skip = abs (x);
 204     int i;
 205     int wrap_start;
 206     int len;
 207
 208     tty_setcolor (EDITOR_NORMAL_COLOR);
 209     if (bookmarked != 0)
 210         tty_setcolor (bookmarked);
 211
 212     len = end_col + 1 - start_col;
 213     wrap_start = option_word_wrap_line_length + edit->start_col;
 214
 215     if (len > 0 && edit->widget.y + y >= 0)
 216     {
 217         if (!show_right_margin || wrap_start > end_col)
 218             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 219         else if (wrap_start < 0)
 220         {
 221             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 222             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 223         }
 224         else
 225         {
 226             if (wrap_start > 0)
 227                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', wrap_start);
 228
 229             len -= wrap_start;
 230             if (len > 0)
 231             {
 232                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 233                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1 + wrap_start, ' ', len);
 234             }
 235         }
 236     }
 237
 238     if (option_line_state)
 239     {
 240         tty_setcolor (LINE_STATE_COLOR);
 241         for (i = 0; i < LINE_STATE_WIDTH; i++)
 242         {
 243             edit_move (x1 + i - option_line_state_width, y);
 244             if (status[i] == '\0')
 245                 status[i] = ' ';
 246             tty_print_char (status[i]);
 247         }
 248     }
 249
 250     edit_move (x1, y);
 251     i = 1;
 252     for (p = line; p->ch != 0; p++)
 253     {
 254         int style;
 255         unsigned int textchar;
 256         int color;
 257
 258         if (cols_to_skip != 0)
 259         {
 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                 tty_setcolor (EDITOR_WHITESPACE_COLOR);
 283         }
 284         else if (style & MOD_BOLD)
 285             tty_setcolor (EDITOR_BOLD_COLOR);
 286         else if (style & MOD_MARKED)
 287             tty_setcolor (EDITOR_MARKED_COLOR);
 288         else
 289             tty_lowlevel_setcolor (color);
 290
 291         if (show_right_margin)
 292         {
 293             if (i > option_word_wrap_line_length + edit->start_col)
 294                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 295             i++;
 296         }
 297
 298         tty_print_anychar (textchar);
 299     }
 300 }
 301
 302 /* --------------------------------------------------------------------------------------------- */
 303 /** b is a pointer to the beginning of the line */
 304
 305 static void
 306 edit_draw_this_line (WEdit * edit, off_t b, long row, long start_col, long end_col)
 307 {
 308     struct line_s line[MAX_LINE_LEN];
 309     struct line_s *p = line;
 310
 311     off_t m1 = 0, m2 = 0, q;
 312     long c1, c2;
 313     int col, start_col_real;
 314     unsigned int c;
 315     int color;
 316     int abn_style;
 317     int i;
 318     unsigned int cur_line = 0;
 319     int book_mark = 0;
 320     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 321
 322     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 323         return;
 324
 325     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 326         book_mark = BOOK_MARK_COLOR;
 327     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 328         book_mark = BOOK_MARK_FOUND_COLOR;
 329
 330     if (book_mark)
 331         abn_style = book_mark << 16;
 332     else
 333         abn_style = MOD_ABNORMAL;
 334
 335     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 336
 337     edit_get_syntax_color (edit, b - 1, &color);
 338     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 339     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 340
 341     if (option_line_state)
 342     {
 343         cur_line = edit->start_line + row;
 344         if (cur_line <= (unsigned int) edit->total_lines)
 345         {
 346             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 347         }
 348         else
 349         {
 350             memset (line_stat, ' ', LINE_STATE_WIDTH);
 351             line_stat[LINE_STATE_WIDTH] = '\0';
 352         }
 353         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 354         {
 355             g_snprintf (line_stat, 2, "*");
 356         }
 357     }
 358
 359     if (col + 16 > -edit->start_col)
 360     {
 361         eval_marks (edit, &m1, &m2);
 362
 363         if (row <= edit->total_lines - edit->start_line)
 364         {
 365             off_t tws = 0;
 366             if (tty_use_colors () && visible_tws)
 367             {
 368                 tws = edit_eol (edit, b);
 369                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 370                     tws--;
 371             }
 372
 373             while (col <= end_col - edit->start_col)
 374             {
 375                 int cw = 1;
 376                 int tab_over = 0;
 377                 gboolean wide_width_char = FALSE;
 378                 gboolean control_char = FALSE;
 379
 380                 p->ch = 0;
 381                 p->style = 0;
 382                 if (q == edit->curs1)
 383                     p->style |= MOD_CURSOR;
 384                 if (q >= m1 && q < m2)
 385                 {
 386                     if (edit->column_highlight)
 387                     {
 388                         long x;
 389
 390                         x = (long) edit_move_forward3 (edit, b, 0, q);
 391                         c1 = min (edit->column1, edit->column2);
 392                         c2 = max (edit->column1, edit->column2);
 393                         if (x >= c1 && x < c2)
 394                             p->style |= MOD_MARKED;
 395                     }
 396                     else
 397                         p->style |= MOD_MARKED;
 398                 }
 399                 if (q == edit->bracket)
 400                     p->style |= MOD_BOLD;
 401                 if (q >= edit->found_start && q < (off_t) (edit->found_start + edit->found_len))
 402                     p->style |= MOD_BOLD;
 403
 404 #ifdef HAVE_CHARSET
 405                 if (edit->utf8)
 406                     c = edit_get_utf (edit, q, &cw);
 407                 else
 408 #endif
 409                     c = edit_get_byte (edit, q);
 410                 /* we don't use bg for mc - fg contains both */
 411                 if (book_mark)
 412                 {
 413                     p->style |= book_mark << 16;
 414                 }
 415                 else
 416                 {
 417                     edit_get_syntax_color (edit, q, &color);
 418                     p->style |= color << 16;
 419                 }
 420                 switch (c)
 421                 {
 422                 case '\n':
 423                     col = end_col - edit->start_col + 1;    /* quit */
 424                     break;
 425                 case '\t':
 426                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 427                     tab_over = (end_col - edit->start_col) - (col + i - 1);
 428                     if (tab_over < 0)
 429                         i += tab_over;
 430                     col += i;
 431                     if (tty_use_colors () &&
 432                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 433                     {
 434                         if (p->style & MOD_MARKED)
 435                             c = p->style;
 436                         else if (book_mark)
 437                             c |= book_mark << 16;
 438                         else
 439                             c = p->style | MOD_WHITESPACE;
 440                         if (i > 2)
 441                         {
 442                             p->ch = '<';
 443                             p->style = c;
 444                             p++;
 445                             while (--i > 1)
 446                             {
 447                                 p->ch = '-';
 448                                 p->style = c;
 449                                 p++;
 450                             }
 451                             p->ch = '>';
 452                             p->style = c;
 453                             p++;
 454                         }
 455                         else if (i > 1)
 456                         {
 457                             p->ch = '<';
 458                             p->style = c;
 459                             p++;
 460                             p->ch = '>';
 461                             p->style = c;
 462                             p++;
 463                         }
 464                         else
 465                         {
 466                             p->ch = '>';
 467                             p->style = c;
 468                             p++;
 469                         }
 470                     }
 471                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 472                     {
 473                         p->ch = '.';
 474                         p->style |= MOD_WHITESPACE;
 475                         c = p->style & ~MOD_CURSOR;
 476                         p++;
 477                         while (--i)
 478                         {
 479                             p->ch = ' ';
 480                             p->style = c;
 481                             p++;
 482                         }
 483                     }
 484                     else
 485                     {
 486                         p->ch |= ' ';
 487                         c = p->style & ~MOD_CURSOR;
 488                         p++;
 489                         while (--i)
 490                         {
 491                             p->ch = ' ';
 492                             p->style = c;
 493                             p++;
 494                         }
 495                     }
 496                     break;
 497                 case ' ':
 498                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 499                     {
 500                         p->ch = '.';
 501                         p->style |= MOD_WHITESPACE;
 502                         p++;
 503                         col++;
 504                         break;
 505                     }
 506                     /* fallthrough */
 507                 default:
 508 #ifdef HAVE_CHARSET
 509                     if (mc_global.utf8_display)
 510                     {
 511                         if (!edit->utf8)
 512                         {
 513                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 514                         }
 515                         else
 516                         {
 517                             if (g_unichar_iswide (c))
 518                             {
 519                                 wide_width_char = TRUE;
 520                                 col++;
 521                             }
 522                         }
 523                     }
 524                     else if (edit->utf8)
 525                         c = convert_from_utf_to_current_c (c, edit->converter);
 526                     else
 527                         c = convert_to_display_c (c);
 528 #endif
 529
 530                     /* Caret notation for control characters */
 531                     if (c < 32)
 532                     {
 533                         p->ch = '^';
 534                         p->style = abn_style;
 535                         p++;
 536                         p->ch = c + 0x40;
 537                         p->style = abn_style;
 538                         p++;
 539                         col += 2;
 540                         control_char = TRUE;
 541                         break;
 542                     }
 543                     if (c == 127)
 544                     {
 545                         p->ch = '^';
 546                         p->style = abn_style;
 547                         p++;
 548                         p->ch = '?';
 549                         p->style = abn_style;
 550                         p++;
 551                         col += 2;
 552                         control_char = TRUE;
 553                         break;
 554                     }
 555 #ifdef HAVE_CHARSET
 556                     if (edit->utf8)
 557                     {
 558                         if (g_unichar_isprint (c))
 559                             p->ch = c;
 560                         else
 561                         {
 562                             p->ch = '.';
 563                             p->style = abn_style;
 564                         }
 565                         p++;
 566                     }
 567                     else
 568 #endif
 569                     {
 570                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 571                             (!mc_global.utf8_display && is_printable (c)))
 572                         {
 573                             p->ch = c;
 574                             p++;
 575                         }
 576                         else
 577                         {
 578                             p->ch = '.';
 579                             p->style = abn_style;
 580                             p++;
 581                         }
 582                     }
 583                     col++;
 584                     break;
 585                 }               /* case */
 586
 587                 q++;
 588                 if (cw > 1)
 589                 {
 590                     q += cw - 1;
 591                 }
 592
 593                 if (col > (end_col - edit->start_col + 1))
 594                 {
 595                     if (wide_width_char)
 596                     {
 597                         p--;
 598                         break;
 599                     }
 600                     if (control_char)
 601                     {
 602                         p -= 2;
 603                         break;
 604                     }
 605                 }
 606             }
 607         }
 608     }
 609     else
 610     {
 611         start_col_real = start_col = 0;
 612     }
 613
 614     p->ch = 0;
 615
 616     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 617 }
 618
 619 /* --------------------------------------------------------------------------------------------- */
 620
 621 static inline void
 622 edit_draw_this_char (WEdit * edit, off_t curs, long row, long start_column, long end_column)
 623 {
 624     off_t b = edit_bol (edit, curs);
 625
 626     edit_draw_this_line (edit, b, row, start_column, end_column);
 627 }
 628
 629 /* --------------------------------------------------------------------------------------------- */
 630 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 631
 632 static inline void
 633 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 634 {
 635     static long prev_curs_row = 0;
 636     static off_t prev_curs = 0;
 637
 638     Widget *w = (Widget *) edit;
 639     Dlg_head *h = w->owner;
 640
 641     long row = 0, curs_row;
 642     int force = edit->force;
 643     long b;
 644     int y1, x1, y2, x2;
 645
 646     int last_line;
 647     int last_column;
 648
 649     /* draw only visible region */
 650
 651     last_line = h->y + h->lines - 1;
 652
 653     y1 = w->y;
 654     if (y1 > last_line - 1 /* buttonbar */ )
 655         return;
 656
 657     last_column = h->x + h->cols - 1;
 658
 659     x1 = w->x;
 660     if (x1 > last_column)
 661         return;
 662
 663     y2 = w->y + w->lines - 1;
 664     if (y2 < h->y + 1 /* menubar */ )
 665         return;
 666
 667     x2 = w->x + w->cols - 1;
 668     if (x2 < h->x)
 669         return;
 670
 671     if ((force & REDRAW_IN_BOUNDS) == 0)
 672     {
 673         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 674         /* draw only visible region */
 675
 676         if (y2 <= last_line - 1 /* buttonbar */ )
 677             end_row = w->lines - 1;
 678         else if (y1 >= h->y + 1 /* menubar */ )
 679             end_row = h->lines - 1 - y1 - 1;
 680         else
 681             end_row = start_row + h->lines - 1 - 1;
 682
 683         if (x2 <= last_column)
 684             end_column = w->cols - 1;
 685         else if (x1 >= h->x)
 686             end_column = h->cols - 1 - x1;
 687         else
 688             end_column = start_column + h->cols - 1;
 689     }
 690
 691     /*
 692      * If the position of the page has not moved then we can draw the cursor
 693      * character only.  This will prevent line flicker when using arrow keys.
 694      */
 695     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 696     {
 697         if ((force & REDRAW_PAGE) != 0)
 698         {
 699             row = start_row;
 700             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 701             while (row <= end_row)
 702             {
 703                 if (key_pending (edit))
 704                     return;
 705                 edit_draw_this_line (edit, b, row, start_column, end_column);
 706                 b = edit_move_forward (edit, b, 1, 0);
 707                 row++;
 708             }
 709         }
 710         else
 711         {
 712             curs_row = edit->curs_row;
 713
 714             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 715             {
 716                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 717
 718                 row = start_row;
 719                 b = edit->start_display;
 720                 while (row <= upto)
 721                 {
 722                     if (key_pending (edit))
 723                         return;
 724                     edit_draw_this_line (edit, b, row, start_column, end_column);
 725                     b = edit_move_forward (edit, b, 1, 0);
 726                 }
 727             }
 728
 729             /*          if (force & REDRAW_LINE)          ---> default */
 730             b = edit_bol (edit, edit->curs1);
 731             if (curs_row >= start_row && curs_row <= end_row)
 732             {
 733                 if (key_pending (edit))
 734                     return;
 735                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 736             }
 737
 738             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 739             {
 740                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 741                 b = edit_move_forward (edit, b, 1, 0);
 742                 while (row <= end_row)
 743                 {
 744                     if (key_pending (edit))
 745                         return;
 746                     edit_draw_this_line (edit, b, row, start_column, end_column);
 747                     b = edit_move_forward (edit, b, 1, 0);
 748                     row++;
 749                 }
 750             }
 751
 752             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 753             {
 754                 row = curs_row - 1;
 755                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 756                 if (row >= start_row && row <= end_row)
 757                 {
 758                     if (key_pending (edit))
 759                         return;
 760                     edit_draw_this_line (edit, b, row, start_column, end_column);
 761                 }
 762             }
 763
 764             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 765             {
 766                 row = curs_row + 1;
 767                 b = edit_bol (edit, edit->curs1);
 768                 b = edit_move_forward (edit, b, 1, 0);
 769                 if (row >= start_row && row <= end_row)
 770                 {
 771                     if (key_pending (edit))
 772                         return;
 773                     edit_draw_this_line (edit, b, row, start_column, end_column);
 774                 }
 775             }
 776         }
 777     }
 778     else if (prev_curs_row < edit->curs_row)
 779     {
 780         /* with the new text highlighting, we must draw from the top down */
 781         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 782         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 783     }
 784     else
 785     {
 786         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 787         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 788     }
 789
 790     edit->force = 0;
 791
 792     prev_curs_row = edit->curs_row;
 793     prev_curs = edit->curs1;
 794 }
 795
 796 /* --------------------------------------------------------------------------------------------- */
 797
 798 static inline void
 799 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 800 {
 801     if (page)                   /* if it was an expose event, 'page' would be set */
 802         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 803
 804     if (edit->force & REDRAW_COMPLETELY)
 805         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 806     render_edit_text (edit, row_start, col_start, row_end, col_end);
 807     /*
 808      * edit->force != 0 means a key was pending and the redraw
 809      * was halted, so next time we must redraw everything in case stuff
 810      * was left undrawn from a previous key press.
 811      */
 812     if (edit->force)
 813         edit->force |= REDRAW_PAGE;
 814 }
 815
 816 /* --------------------------------------------------------------------------------------------- */
 817 /*** public functions ****************************************************************************/
 818 /* --------------------------------------------------------------------------------------------- */
 819
 820 /** Draw the status line at the top of the screen. The size of the filename
 821  * field varies depending on the width of the screen and the length of
 822  * the filename. */
 823 void
 824 edit_status (WEdit * edit)
 825 {
 826     const int w = edit->widget.owner->cols;
 827     const size_t status_size = w + 1;
 828     char *const status = g_malloc (status_size);
 829     int status_len;
 830     const char *fname = "";
 831     int fname_len;
 832     const int gap = 3;          /* between the filename and the status */
 833     const int right_gap = 5;    /* at the right end of the screen */
 834     const int preferred_fname_len = 16;
 835
 836     status_string (edit, status, status_size);
 837     status_len = (int) str_term_width1 (status);
 838
 839     if (edit->filename_vpath != NULL)
 840         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 841
 842     fname_len = str_term_width1 (fname);
 843     if (fname_len < preferred_fname_len)
 844         fname_len = preferred_fname_len;
 845
 846     if (fname_len + gap + status_len + right_gap >= w)
 847     {
 848         if (preferred_fname_len + gap + status_len + right_gap >= w)
 849             fname_len = preferred_fname_len;
 850         else
 851             fname_len = w - (gap + status_len + right_gap);
 852         fname = str_trunc (fname, fname_len);
 853     }
 854
 855     dlg_move (edit->widget.owner, 0, 0);
 856     tty_setcolor (STATUSBAR_COLOR);
 857     printwstr (fname, fname_len + gap);
 858     printwstr (status, w - (fname_len + gap));
 859
 860     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 861     {
 862         size_t percent = 100;
 863
 864         if (edit->total_lines + 1 != 0)
 865             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 866         dlg_move (edit->widget.owner, 0, w - 5);
 867         tty_printf (" %3d%%", percent);
 868     }
 869
 870     g_free (status);
 871 }
 872
 873 /* --------------------------------------------------------------------------------------------- */
 874 /** this scrolls the text so that cursor is on the screen */
 875 void
 876 edit_scroll_screen_over_cursor (WEdit * edit)
 877 {
 878     long p;
 879     long outby;
 880     int b_extreme, t_extreme, l_extreme, r_extreme;
 881
 882     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 883         return;
 884
 885     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 886     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 887
 888     r_extreme = EDIT_RIGHT_EXTREME;
 889     l_extreme = EDIT_LEFT_EXTREME;
 890     b_extreme = EDIT_BOTTOM_EXTREME;
 891     t_extreme = EDIT_TOP_EXTREME;
 892     if (edit->found_len != 0)
 893     {
 894         b_extreme = max (edit->widget.lines / 4, b_extreme);
 895         t_extreme = max (edit->widget.lines / 4, t_extreme);
 896     }
 897     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 898     {
 899         int n;
 900
 901         n = b_extreme + t_extreme;
 902         if (n == 0)
 903             n = 1;
 904         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 905         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 906     }
 907     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 908     {
 909         int n;
 910
 911         n = l_extreme + t_extreme;
 912         if (n == 0)
 913             n = 1;
 914         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 915         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 916     }
 917     p = edit_get_col (edit) + edit->over_col;
 918     edit_update_curs_row (edit);
 919     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 920     if (outby > 0)
 921         edit_scroll_right (edit, outby);
 922     outby = l_extreme - p - edit->start_col;
 923     if (outby > 0)
 924         edit_scroll_left (edit, outby);
 925     p = edit->curs_row;
 926     outby = p - edit->widget.lines + 1 + b_extreme;
 927     if (outby > 0)
 928         edit_scroll_downward (edit, outby);
 929     outby = t_extreme - p;
 930     if (outby > 0)
 931         edit_scroll_upward (edit, outby);
 932     edit_update_curs_row (edit);
 933
 934     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 935     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 936 }
 937
 938 /* --------------------------------------------------------------------------------------------- */
 939
 940 void
 941 edit_render_keypress (WEdit * edit)
 942 {
 943     edit_render (edit, 0, 0, 0, 0, 0);
 944 }
 945
 946 /* --------------------------------------------------------------------------------------------- */