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_byte);
 138             }
 139 #ifdef HAVE_CHARSET
 140         }
 141 #endif
 142     }
 143     else
 144     {
 145         strcpy (byte_str, "<EOF>     ");
 146     }
 147
 148     /* The field lengths just prevent the status line from shortening too much */
 149     if (simple_statusbar)
 150         g_snprintf (s, w,
 151                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 152                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 153                     edit->modified ? 'M' : '-',
 154                     macro_index < 0 ? '-' : 'R',
 155                     edit->overwrite == 0 ? '-' : 'O',
 156                     edit->curs_col + edit->over_col,
 157                     edit->curs_line + 1,
 158                     edit->total_lines + 1, (long) edit->curs1, (long) edit->last_byte, byte_str,
 159 #ifdef HAVE_CHARSET
 160                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 161 #endif
 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 >= 0 ? get_codepage_id (mc_global.source_codepage) :
 177 #endif
 178                     "");
 179 }
 180
 181 /* --------------------------------------------------------------------------------------------- */
 182
 183 static inline void
 184 printwstr (const char *s, int len)
 185 {
 186     if (len > 0)
 187         tty_printf ("%-*.*s", len, len, s);
 188 }
 189
 190 /* --------------------------------------------------------------------------------------------- */
 191
 192 static inline void
 193 print_to_widget (WEdit * edit, long row, int start_col, int start_col_real,
 194                  long end_col, struct line_s line[], char *status, int bookmarked)
 195 {
 196     struct line_s *p;
 197
 198     int x = start_col_real;
 199     int x1 = start_col + EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 200     int y = row + EDIT_TEXT_VERTICAL_OFFSET;
 201     int cols_to_skip = abs (x);
 202     int i;
 203     int wrap_start;
 204     int len;
 205
 206     tty_setcolor (EDITOR_NORMAL_COLOR);
 207     if (bookmarked != 0)
 208         tty_setcolor (bookmarked);
 209
 210     len = end_col + 1 - start_col;
 211     wrap_start = option_word_wrap_line_length + edit->start_col;
 212
 213     if (len > 0 && edit->widget.y + y >= 0)
 214     {
 215         if (!show_right_margin || wrap_start > end_col)
 216             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 217         else if (wrap_start < 0)
 218         {
 219             tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 220             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 221         }
 222         else
 223         {
 224             if (wrap_start > 0)
 225                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', wrap_start);
 226
 227             len -= wrap_start;
 228             if (len > 0)
 229             {
 230                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 231                 tty_draw_hline (edit->widget.y + y, edit->widget.x + x1 + wrap_start, ' ', len);
 232             }
 233         }
 234     }
 235
 236     if (option_line_state)
 237     {
 238         tty_setcolor (LINE_STATE_COLOR);
 239         for (i = 0; i < LINE_STATE_WIDTH; i++)
 240         {
 241             edit_move (x1 + i - option_line_state_width, y);
 242             if (status[i] == '\0')
 243                 status[i] = ' ';
 244             tty_print_char (status[i]);
 245         }
 246     }
 247
 248     edit_move (x1, y);
 249     i = 1;
 250     for (p = line; p->ch != 0; p++)
 251     {
 252         int style;
 253         unsigned int textchar;
 254         int color;
 255
 256         if (cols_to_skip != 0)
 257         {
 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                 tty_setcolor (EDITOR_WHITESPACE_COLOR);
 281         }
 282         else if (style & MOD_BOLD)
 283             tty_setcolor (EDITOR_BOLD_COLOR);
 284         else if (style & MOD_MARKED)
 285             tty_setcolor (EDITOR_MARKED_COLOR);
 286         else
 287             tty_lowlevel_setcolor (color);
 288
 289         if (show_right_margin)
 290         {
 291             if (i > option_word_wrap_line_length + edit->start_col)
 292                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 293             i++;
 294         }
 295
 296         tty_print_anychar (textchar);
 297     }
 298 }
 299
 300 /* --------------------------------------------------------------------------------------------- */
 301 /** b is a pointer to the beginning of the line */
 302
 303 static void
 304 edit_draw_this_line (WEdit * edit, off_t b, long row, long start_col, long end_col)
 305 {
 306     struct line_s line[MAX_LINE_LEN];
 307     struct line_s *p = line;
 308
 309     off_t m1 = 0, m2 = 0, q;
 310     long c1, c2;
 311     int col, start_col_real;
 312     unsigned int c;
 313     int color;
 314     int abn_style;
 315     int i;
 316     unsigned int cur_line = 0;
 317     int book_mark = 0;
 318     char line_stat[LINE_STATE_WIDTH + 1] = "\0";
 319
 320     if (row > edit->widget.lines - 1 - EDIT_TEXT_VERTICAL_OFFSET)
 321         return;
 322
 323     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 324         book_mark = BOOK_MARK_COLOR;
 325     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 326         book_mark = BOOK_MARK_FOUND_COLOR;
 327
 328     if (book_mark)
 329         abn_style = book_mark << 16;
 330     else
 331         abn_style = MOD_ABNORMAL;
 332
 333     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 334
 335     color = edit_get_syntax_color (edit, b - 1);
 336     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 337     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 338
 339     if (option_line_state)
 340     {
 341         cur_line = edit->start_line + row;
 342         if (cur_line <= (unsigned int) edit->total_lines)
 343         {
 344             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 345         }
 346         else
 347         {
 348             memset (line_stat, ' ', LINE_STATE_WIDTH);
 349             line_stat[LINE_STATE_WIDTH] = '\0';
 350         }
 351         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 352         {
 353             g_snprintf (line_stat, 2, "*");
 354         }
 355     }
 356
 357     if (col + 16 > -edit->start_col)
 358     {
 359         eval_marks (edit, &m1, &m2);
 360
 361         if (row <= edit->total_lines - edit->start_line)
 362         {
 363             off_t tws = 0;
 364             if (tty_use_colors () && visible_tws)
 365             {
 366                 tws = edit_eol (edit, b);
 367                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 368                     tws--;
 369             }
 370
 371             while (col <= end_col - edit->start_col)
 372             {
 373                 int cw = 1;
 374                 int tab_over = 0;
 375                 gboolean wide_width_char = FALSE;
 376                 gboolean control_char = FALSE;
 377
 378                 p->ch = 0;
 379                 p->style = 0;
 380                 if (q == edit->curs1)
 381                     p->style |= MOD_CURSOR;
 382                 if (q >= m1 && q < m2)
 383                 {
 384                     if (edit->column_highlight)
 385                     {
 386                         long x;
 387
 388                         x = (long) edit_move_forward3 (edit, b, 0, q);
 389                         c1 = min (edit->column1, edit->column2);
 390                         c2 = max (edit->column1, edit->column2);
 391                         if (x >= c1 && x < c2)
 392                             p->style |= MOD_MARKED;
 393                     }
 394                     else
 395                         p->style |= MOD_MARKED;
 396                 }
 397                 if (q == edit->bracket)
 398                     p->style |= MOD_BOLD;
 399                 if (q >= edit->found_start && q < (off_t) (edit->found_start + edit->found_len))
 400                     p->style |= MOD_BOLD;
 401
 402 #ifdef HAVE_CHARSET
 403                 if (edit->utf8)
 404                     c = edit_get_utf (edit, q, &cw);
 405                 else
 406 #endif
 407                     c = edit_get_byte (edit, q);
 408                 /* we don't use bg for mc - fg contains both */
 409                 if (book_mark)
 410                 {
 411                     p->style |= book_mark << 16;
 412                 }
 413                 else
 414                 {
 415                     color = edit_get_syntax_color (edit, q);
 416                     p->style |= color << 16;
 417                 }
 418                 switch (c)
 419                 {
 420                 case '\n':
 421                     col = end_col - edit->start_col + 1;        /* quit */
 422                     break;
 423                 case '\t':
 424                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 425                     tab_over = (end_col - edit->start_col) - (col + i - 1);
 426                     if (tab_over < 0)
 427                         i += tab_over;
 428                     col += i;
 429                     if (tty_use_colors () &&
 430                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 431                     {
 432                         if (p->style & MOD_MARKED)
 433                             c = p->style;
 434                         else if (book_mark)
 435                             c |= book_mark << 16;
 436                         else
 437                             c = p->style | MOD_WHITESPACE;
 438                         if (i > 2)
 439                         {
 440                             p->ch = '<';
 441                             p->style = c;
 442                             p++;
 443                             while (--i > 1)
 444                             {
 445                                 p->ch = '-';
 446                                 p->style = c;
 447                                 p++;
 448                             }
 449                             p->ch = '>';
 450                             p->style = c;
 451                             p++;
 452                         }
 453                         else if (i > 1)
 454                         {
 455                             p->ch = '<';
 456                             p->style = c;
 457                             p++;
 458                             p->ch = '>';
 459                             p->style = c;
 460                             p++;
 461                         }
 462                         else
 463                         {
 464                             p->ch = '>';
 465                             p->style = c;
 466                             p++;
 467                         }
 468                     }
 469                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 470                     {
 471                         p->ch = '.';
 472                         p->style |= MOD_WHITESPACE;
 473                         c = p->style & ~MOD_CURSOR;
 474                         p++;
 475                         while (--i)
 476                         {
 477                             p->ch = ' ';
 478                             p->style = c;
 479                             p++;
 480                         }
 481                     }
 482                     else
 483                     {
 484                         p->ch |= ' ';
 485                         c = p->style & ~MOD_CURSOR;
 486                         p++;
 487                         while (--i)
 488                         {
 489                             p->ch = ' ';
 490                             p->style = c;
 491                             p++;
 492                         }
 493                     }
 494                     break;
 495                 case ' ':
 496                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 497                     {
 498                         p->ch = '.';
 499                         p->style |= MOD_WHITESPACE;
 500                         p++;
 501                         col++;
 502                         break;
 503                     }
 504                     /* fallthrough */
 505                 default:
 506 #ifdef HAVE_CHARSET
 507                     if (mc_global.utf8_display)
 508                     {
 509                         if (!edit->utf8)
 510                         {
 511                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 512                         }
 513                         else
 514                         {
 515                             if (g_unichar_iswide (c))
 516                             {
 517                                 wide_width_char = TRUE;
 518                                 col++;
 519                             }
 520                         }
 521                     }
 522                     else if (edit->utf8)
 523                         c = convert_from_utf_to_current_c (c, edit->converter);
 524                     else
 525                         c = convert_to_display_c (c);
 526 #endif
 527
 528                     /* Caret notation for control characters */
 529                     if (c < 32)
 530                     {
 531                         p->ch = '^';
 532                         p->style = abn_style;
 533                         p++;
 534                         p->ch = c + 0x40;
 535                         p->style = abn_style;
 536                         p++;
 537                         col += 2;
 538                         control_char = TRUE;
 539                         break;
 540                     }
 541                     if (c == 127)
 542                     {
 543                         p->ch = '^';
 544                         p->style = abn_style;
 545                         p++;
 546                         p->ch = '?';
 547                         p->style = abn_style;
 548                         p++;
 549                         col += 2;
 550                         control_char = TRUE;
 551                         break;
 552                     }
 553 #ifdef HAVE_CHARSET
 554                     if (edit->utf8)
 555                     {
 556                         if (g_unichar_isprint (c))
 557                             p->ch = c;
 558                         else
 559                         {
 560                             p->ch = '.';
 561                             p->style = abn_style;
 562                         }
 563                         p++;
 564                     }
 565                     else
 566 #endif
 567                     {
 568                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 569                             (!mc_global.utf8_display && is_printable (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, off_t curs, long row, long start_column, long end_column)
 621 {
 622     off_t b = edit_bol (edit, curs);
 623
 624     edit_draw_this_line (edit, b, row, start_column, end_column);
 625 }
 626
 627 /* --------------------------------------------------------------------------------------------- */
 628 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 629
 630 static inline void
 631 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 632 {
 633     static long prev_curs_row = 0;
 634     static off_t prev_curs = 0;
 635
 636     Widget *w = (Widget *) edit;
 637     Dlg_head *h = w->owner;
 638
 639     long row = 0, curs_row;
 640     int force = edit->force;
 641     long b;
 642     int y1, x1, y2, x2;
 643
 644     int last_line;
 645     int last_column;
 646
 647     /* draw only visible region */
 648
 649     last_line = h->y + h->lines - 1;
 650
 651     y1 = w->y;
 652     if (y1 > last_line - 1 /* buttonbar */ )
 653         return;
 654
 655     last_column = h->x + h->cols - 1;
 656
 657     x1 = w->x;
 658     if (x1 > last_column)
 659         return;
 660
 661     y2 = w->y + w->lines - 1;
 662     if (y2 < h->y + 1 /* menubar */ )
 663         return;
 664
 665     x2 = w->x + w->cols - 1;
 666     if (x2 < h->x)
 667         return;
 668
 669     if ((force & REDRAW_IN_BOUNDS) == 0)
 670     {
 671         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 672         /* draw only visible region */
 673
 674         if (y2 <= last_line - 1 /* buttonbar */ )
 675             end_row = w->lines - 1;
 676         else if (y1 >= h->y + 1 /* menubar */ )
 677             end_row = h->lines - 1 - y1 - 1;
 678         else
 679             end_row = start_row + h->lines - 1 - 1;
 680
 681         if (x2 <= last_column)
 682             end_column = w->cols - 1;
 683         else if (x1 >= h->x)
 684             end_column = h->cols - 1 - x1;
 685         else
 686             end_column = start_column + h->cols - 1;
 687     }
 688
 689     /*
 690      * If the position of the page has not moved then we can draw the cursor
 691      * character only.  This will prevent line flicker when using arrow keys.
 692      */
 693     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 694     {
 695         if ((force & REDRAW_PAGE) != 0)
 696         {
 697             row = start_row;
 698             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 699             while (row <= end_row)
 700             {
 701                 if (key_pending (edit))
 702                     return;
 703                 edit_draw_this_line (edit, b, row, start_column, end_column);
 704                 b = edit_move_forward (edit, b, 1, 0);
 705                 row++;
 706             }
 707         }
 708         else
 709         {
 710             curs_row = edit->curs_row;
 711
 712             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 713             {
 714                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 715
 716                 row = start_row;
 717                 b = edit->start_display;
 718                 while (row <= upto)
 719                 {
 720                     if (key_pending (edit))
 721                         return;
 722                     edit_draw_this_line (edit, b, row, start_column, end_column);
 723                     b = edit_move_forward (edit, b, 1, 0);
 724                 }
 725             }
 726
 727             /*          if (force & REDRAW_LINE)          ---> default */
 728             b = edit_bol (edit, edit->curs1);
 729             if (curs_row >= start_row && curs_row <= end_row)
 730             {
 731                 if (key_pending (edit))
 732                     return;
 733                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 734             }
 735
 736             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 737             {
 738                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 739                 b = edit_move_forward (edit, b, 1, 0);
 740                 while (row <= end_row)
 741                 {
 742                     if (key_pending (edit))
 743                         return;
 744                     edit_draw_this_line (edit, b, row, start_column, end_column);
 745                     b = edit_move_forward (edit, b, 1, 0);
 746                     row++;
 747                 }
 748             }
 749
 750             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 751             {
 752                 row = curs_row - 1;
 753                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 754                 if (row >= start_row && row <= end_row)
 755                 {
 756                     if (key_pending (edit))
 757                         return;
 758                     edit_draw_this_line (edit, b, row, start_column, end_column);
 759                 }
 760             }
 761
 762             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 763             {
 764                 row = curs_row + 1;
 765                 b = edit_bol (edit, edit->curs1);
 766                 b = edit_move_forward (edit, b, 1, 0);
 767                 if (row >= start_row && row <= end_row)
 768                 {
 769                     if (key_pending (edit))
 770                         return;
 771                     edit_draw_this_line (edit, b, row, start_column, end_column);
 772                 }
 773             }
 774         }
 775     }
 776     else if (prev_curs_row < edit->curs_row)
 777     {
 778         /* with the new text highlighting, we must draw from the top down */
 779         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 780         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 781     }
 782     else
 783     {
 784         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 785         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 786     }
 787
 788     edit->force = 0;
 789
 790     prev_curs_row = edit->curs_row;
 791     prev_curs = edit->curs1;
 792 }
 793
 794 /* --------------------------------------------------------------------------------------------- */
 795
 796 static inline void
 797 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 798 {
 799     if (page)                   /* if it was an expose event, 'page' would be set */
 800         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 801
 802     if (edit->force & REDRAW_COMPLETELY)
 803         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 804     render_edit_text (edit, row_start, col_start, row_end, col_end);
 805     /*
 806      * edit->force != 0 means a key was pending and the redraw
 807      * was halted, so next time we must redraw everything in case stuff
 808      * was left undrawn from a previous key press.
 809      */
 810     if (edit->force)
 811         edit->force |= REDRAW_PAGE;
 812 }
 813
 814 /* --------------------------------------------------------------------------------------------- */
 815 /*** public functions ****************************************************************************/
 816 /* --------------------------------------------------------------------------------------------- */
 817
 818 /** Draw the status line at the top of the screen. The size of the filename
 819  * field varies depending on the width of the screen and the length of
 820  * the filename. */
 821 void
 822 edit_status (WEdit * edit)
 823 {
 824     const int w = edit->widget.owner->cols;
 825     const size_t status_size = w + 1;
 826     char *const status = g_malloc (status_size);
 827     int status_len;
 828     const char *fname = "";
 829     int fname_len;
 830     const int gap = 3;          /* between the filename and the status */
 831     const int right_gap = 5;    /* at the right end of the screen */
 832     const int preferred_fname_len = 16;
 833
 834     status_string (edit, status, status_size);
 835     status_len = (int) str_term_width1 (status);
 836
 837     if (edit->filename_vpath != NULL)
 838         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 839
 840     fname_len = str_term_width1 (fname);
 841     if (fname_len < preferred_fname_len)
 842         fname_len = preferred_fname_len;
 843
 844     if (fname_len + gap + status_len + right_gap >= w)
 845     {
 846         if (preferred_fname_len + gap + status_len + right_gap >= w)
 847             fname_len = preferred_fname_len;
 848         else
 849             fname_len = w - (gap + status_len + right_gap);
 850         fname = str_trunc (fname, fname_len);
 851     }
 852
 853     dlg_move (edit->widget.owner, 0, 0);
 854     tty_setcolor (STATUSBAR_COLOR);
 855     printwstr (fname, fname_len + gap);
 856     printwstr (status, w - (fname_len + gap));
 857
 858     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 859     {
 860         size_t percent = 100;
 861
 862         if (edit->total_lines + 1 != 0)
 863             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 864         dlg_move (edit->widget.owner, 0, w - 5);
 865         tty_printf (" %3d%%", percent);
 866     }
 867
 868     g_free (status);
 869 }
 870
 871 /* --------------------------------------------------------------------------------------------- */
 872 /** this scrolls the text so that cursor is on the screen */
 873 void
 874 edit_scroll_screen_over_cursor (WEdit * edit)
 875 {
 876     long p;
 877     long outby;
 878     int b_extreme, t_extreme, l_extreme, r_extreme;
 879
 880     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 881         return;
 882
 883     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 884     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 885
 886     r_extreme = EDIT_RIGHT_EXTREME;
 887     l_extreme = EDIT_LEFT_EXTREME;
 888     b_extreme = EDIT_BOTTOM_EXTREME;
 889     t_extreme = EDIT_TOP_EXTREME;
 890     if (edit->found_len != 0)
 891     {
 892         b_extreme = max (edit->widget.lines / 4, b_extreme);
 893         t_extreme = max (edit->widget.lines / 4, t_extreme);
 894     }
 895     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 896     {
 897         int n;
 898
 899         n = b_extreme + t_extreme;
 900         if (n == 0)
 901             n = 1;
 902         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 903         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 904     }
 905     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 906     {
 907         int n;
 908
 909         n = l_extreme + t_extreme;
 910         if (n == 0)
 911             n = 1;
 912         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 913         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 914     }
 915     p = edit_get_col (edit) + edit->over_col;
 916     edit_update_curs_row (edit);
 917     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 918     if (outby > 0)
 919         edit_scroll_right (edit, outby);
 920     outby = l_extreme - p - edit->start_col;
 921     if (outby > 0)
 922         edit_scroll_left (edit, outby);
 923     p = edit->curs_row;
 924     outby = p - edit->widget.lines + 1 + b_extreme;
 925     if (outby > 0)
 926         edit_scroll_downward (edit, outby);
 927     outby = t_extreme - p;
 928     if (outby > 0)
 929         edit_scroll_upward (edit, outby);
 930     edit_update_curs_row (edit);
 931
 932     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 933     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 934 }
 935
 936 /* --------------------------------------------------------------------------------------------- */
 937
 938 void
 939 edit_render_keypress (WEdit * edit)
 940 {
 941     edit_render (edit, 0, 0, 0, 0, 0);
 942 }
 943
 944 /* --------------------------------------------------------------------------------------------- */