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 >= 0 ? get_codepage_id (mc_global.source_codepage) :
 159 #endif
 160                     "");
 161     else
 162         g_snprintf (s, w,
 163                     "[%c%c%c%c] %2ld L:[%3ld+%2ld %3ld/%3ld] *(%-4ld/%4ldb) %s  %s",
 164                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 165                     edit->modified ? 'M' : '-',
 166                     macro_index < 0 ? '-' : 'R',
 167                     edit->overwrite == 0 ? '-' : 'O',
 168                     edit->curs_col + edit->over_col,
 169                     edit->start_line + 1,
 170                     edit->curs_row,
 171                     edit->curs_line + 1,
 172                     edit->total_lines + 1, (long) edit->curs1, (long) edit->last_byte, byte_str,
 173 #ifdef HAVE_CHARSET
 174                     mc_global.source_codepage >= 0 ? get_codepage_id (mc_global.source_codepage) :
 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, off_t 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     off_t m1 = 0, m2 = 0, q;
 308     long c1, c2;
 309     int col, start_col_real;
 310     unsigned int c;
 311     int color;
 312     int abn_style;
 313     int i;
 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             off_t 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                         long x;
 385
 386                         x = (long) edit_move_forward3 (edit, b, 0, q);
 387                         c1 = min (edit->column1, edit->column2);
 388                         c2 = max (edit->column1, edit->column2);
 389                         if (x >= c1 && x < c2)
 390                             p->style |= MOD_MARKED;
 391                     }
 392                     else
 393                         p->style |= MOD_MARKED;
 394                 }
 395                 if (q == edit->bracket)
 396                     p->style |= MOD_BOLD;
 397                 if (q >= edit->found_start && q < (off_t) (edit->found_start + edit->found_len))
 398                     p->style |= MOD_BOLD;
 399
 400 #ifdef HAVE_CHARSET
 401                 if (edit->utf8)
 402                     c = edit_get_utf (edit, q, &cw);
 403                 else
 404 #endif
 405                     c = edit_get_byte (edit, q);
 406                 /* we don't use bg for mc - fg contains both */
 407                 if (book_mark)
 408                 {
 409                     p->style |= book_mark << 16;
 410                 }
 411                 else
 412                 {
 413                     edit_get_syntax_color (edit, q, &color);
 414                     p->style |= color << 16;
 415                 }
 416                 switch (c)
 417                 {
 418                 case '\n':
 419                     col = end_col - edit->start_col + 1;        /* quit */
 420                     break;
 421                 case '\t':
 422                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 423                     tab_over = (end_col - edit->start_col) - (col + i - 1);
 424                     if (tab_over < 0)
 425                         i += tab_over;
 426                     col += i;
 427                     if (tty_use_colors () &&
 428                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 429                     {
 430                         if (p->style & MOD_MARKED)
 431                             c = p->style;
 432                         else if (book_mark)
 433                             c |= book_mark << 16;
 434                         else
 435                             c = p->style | MOD_WHITESPACE;
 436                         if (i > 2)
 437                         {
 438                             p->ch = '<';
 439                             p->style = c;
 440                             p++;
 441                             while (--i > 1)
 442                             {
 443                                 p->ch = '-';
 444                                 p->style = c;
 445                                 p++;
 446                             }
 447                             p->ch = '>';
 448                             p->style = c;
 449                             p++;
 450                         }
 451                         else if (i > 1)
 452                         {
 453                             p->ch = '<';
 454                             p->style = c;
 455                             p++;
 456                             p->ch = '>';
 457                             p->style = c;
 458                             p++;
 459                         }
 460                         else
 461                         {
 462                             p->ch = '>';
 463                             p->style = c;
 464                             p++;
 465                         }
 466                     }
 467                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 468                     {
 469                         p->ch = '.';
 470                         p->style |= MOD_WHITESPACE;
 471                         c = p->style & ~MOD_CURSOR;
 472                         p++;
 473                         while (--i)
 474                         {
 475                             p->ch = ' ';
 476                             p->style = c;
 477                             p++;
 478                         }
 479                     }
 480                     else
 481                     {
 482                         p->ch |= ' ';
 483                         c = p->style & ~MOD_CURSOR;
 484                         p++;
 485                         while (--i)
 486                         {
 487                             p->ch = ' ';
 488                             p->style = c;
 489                             p++;
 490                         }
 491                     }
 492                     break;
 493                 case ' ':
 494                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 495                     {
 496                         p->ch = '.';
 497                         p->style |= MOD_WHITESPACE;
 498                         p++;
 499                         col++;
 500                         break;
 501                     }
 502                     /* fallthrough */
 503                 default:
 504 #ifdef HAVE_CHARSET
 505                     if (mc_global.utf8_display)
 506                     {
 507                         if (!edit->utf8)
 508                         {
 509                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 510                         }
 511                         else
 512                         {
 513                             if (g_unichar_iswide (c))
 514                             {
 515                                 wide_width_char = TRUE;
 516                                 col++;
 517                             }
 518                         }
 519                     }
 520                     else if (edit->utf8)
 521                         c = convert_from_utf_to_current_c (c, edit->converter);
 522                     else
 523                         c = convert_to_display_c (c);
 524 #endif
 525
 526                     /* Caret notation for control characters */
 527                     if (c < 32)
 528                     {
 529                         p->ch = '^';
 530                         p->style = abn_style;
 531                         p++;
 532                         p->ch = c + 0x40;
 533                         p->style = abn_style;
 534                         p++;
 535                         col += 2;
 536                         control_char = TRUE;
 537                         break;
 538                     }
 539                     if (c == 127)
 540                     {
 541                         p->ch = '^';
 542                         p->style = abn_style;
 543                         p++;
 544                         p->ch = '?';
 545                         p->style = abn_style;
 546                         p++;
 547                         col += 2;
 548                         control_char = TRUE;
 549                         break;
 550                     }
 551 #ifdef HAVE_CHARSET
 552                     if (edit->utf8)
 553                     {
 554                         if (g_unichar_isprint (c))
 555                             p->ch = c;
 556                         else
 557                         {
 558                             p->ch = '.';
 559                             p->style = abn_style;
 560                         }
 561                         p++;
 562                     }
 563                     else
 564 #endif
 565                     {
 566                         if ((mc_global.utf8_display && g_unichar_isprint (c)) ||
 567                             (!mc_global.utf8_display && is_printable (c)))
 568                         {
 569                             p->ch = c;
 570                             p++;
 571                         }
 572                         else
 573                         {
 574                             p->ch = '.';
 575                             p->style = abn_style;
 576                             p++;
 577                         }
 578                     }
 579                     col++;
 580                     break;
 581                 }               /* case */
 582
 583                 q++;
 584                 if (cw > 1)
 585                 {
 586                     q += cw - 1;
 587                 }
 588
 589                 if (col > (end_col - edit->start_col + 1))
 590                 {
 591                     if (wide_width_char)
 592                     {
 593                         p--;
 594                         break;
 595                     }
 596                     if (control_char)
 597                     {
 598                         p -= 2;
 599                         break;
 600                     }
 601                 }
 602             }
 603         }
 604     }
 605     else
 606     {
 607         start_col_real = start_col = 0;
 608     }
 609
 610     p->ch = 0;
 611
 612     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 613 }
 614
 615 /* --------------------------------------------------------------------------------------------- */
 616
 617 static inline void
 618 edit_draw_this_char (WEdit * edit, off_t curs, long row, long start_column, long end_column)
 619 {
 620     off_t b = edit_bol (edit, curs);
 621
 622     edit_draw_this_line (edit, b, row, start_column, end_column);
 623 }
 624
 625 /* --------------------------------------------------------------------------------------------- */
 626 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 627
 628 static inline void
 629 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 630 {
 631     static long prev_curs_row = 0;
 632     static off_t prev_curs = 0;
 633
 634     Widget *w = (Widget *) edit;
 635     Dlg_head *h = w->owner;
 636
 637     long row = 0, curs_row;
 638     int force = edit->force;
 639     long b;
 640     int y1, x1, y2, x2;
 641
 642     int last_line;
 643     int last_column;
 644
 645     /* draw only visible region */
 646
 647     last_line = h->y + h->lines - 1;
 648
 649     y1 = w->y;
 650     if (y1 > last_line - 1 /* buttonbar */ )
 651         return;
 652
 653     last_column = h->x + h->cols - 1;
 654
 655     x1 = w->x;
 656     if (x1 > last_column)
 657         return;
 658
 659     y2 = w->y + w->lines - 1;
 660     if (y2 < h->y + 1 /* menubar */ )
 661         return;
 662
 663     x2 = w->x + w->cols - 1;
 664     if (x2 < h->x)
 665         return;
 666
 667     if ((force & REDRAW_IN_BOUNDS) == 0)
 668     {
 669         /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 670         /* draw only visible region */
 671
 672         if (y2 <= last_line - 1 /* buttonbar */ )
 673             end_row = w->lines - 1;
 674         else if (y1 >= h->y + 1 /* menubar */ )
 675             end_row = h->lines - 1 - y1 - 1;
 676         else
 677             end_row = start_row + h->lines - 1 - 1;
 678
 679         if (x2 <= last_column)
 680             end_column = w->cols - 1;
 681         else if (x1 >= h->x)
 682             end_column = h->cols - 1 - x1;
 683         else
 684             end_column = start_column + h->cols - 1;
 685     }
 686
 687     /*
 688      * If the position of the page has not moved then we can draw the cursor
 689      * character only.  This will prevent line flicker when using arrow keys.
 690      */
 691     if ((force & REDRAW_CHAR_ONLY) == 0 || (force & REDRAW_PAGE) != 0)
 692     {
 693         if ((force & REDRAW_PAGE) != 0)
 694         {
 695             row = start_row;
 696             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 697             while (row <= end_row)
 698             {
 699                 if (key_pending (edit))
 700                     return;
 701                 edit_draw_this_line (edit, b, row, start_column, end_column);
 702                 b = edit_move_forward (edit, b, 1, 0);
 703                 row++;
 704             }
 705         }
 706         else
 707         {
 708             curs_row = edit->curs_row;
 709
 710             if ((force & REDRAW_BEFORE_CURSOR) != 0 && start_row < curs_row)
 711             {
 712                 long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 713
 714                 row = start_row;
 715                 b = edit->start_display;
 716                 while (row <= upto)
 717                 {
 718                     if (key_pending (edit))
 719                         return;
 720                     edit_draw_this_line (edit, b, row, start_column, end_column);
 721                     b = edit_move_forward (edit, b, 1, 0);
 722                 }
 723             }
 724
 725             /*          if (force & REDRAW_LINE)          ---> default */
 726             b = edit_bol (edit, edit->curs1);
 727             if (curs_row >= start_row && curs_row <= end_row)
 728             {
 729                 if (key_pending (edit))
 730                     return;
 731                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 732             }
 733
 734             if ((force & REDRAW_AFTER_CURSOR) != 0 && end_row > curs_row)
 735             {
 736                 row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 737                 b = edit_move_forward (edit, b, 1, 0);
 738                 while (row <= end_row)
 739                 {
 740                     if (key_pending (edit))
 741                         return;
 742                     edit_draw_this_line (edit, b, row, start_column, end_column);
 743                     b = edit_move_forward (edit, b, 1, 0);
 744                     row++;
 745                 }
 746             }
 747
 748             if ((force & REDRAW_LINE_ABOVE) != 0 && curs_row >= 1)
 749             {
 750                 row = curs_row - 1;
 751                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 752                 if (row >= start_row && row <= end_row)
 753                 {
 754                     if (key_pending (edit))
 755                         return;
 756                     edit_draw_this_line (edit, b, row, start_column, end_column);
 757                 }
 758             }
 759
 760             if ((force & REDRAW_LINE_BELOW) != 0 && row < edit->widget.lines - 1)
 761             {
 762                 row = curs_row + 1;
 763                 b = edit_bol (edit, edit->curs1);
 764                 b = edit_move_forward (edit, b, 1, 0);
 765                 if (row >= start_row && row <= end_row)
 766                 {
 767                     if (key_pending (edit))
 768                         return;
 769                     edit_draw_this_line (edit, b, row, start_column, end_column);
 770                 }
 771             }
 772         }
 773     }
 774     else if (prev_curs_row < edit->curs_row)
 775     {
 776         /* with the new text highlighting, we must draw from the top down */
 777         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 778         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 779     }
 780     else
 781     {
 782         edit_draw_this_char (edit, edit->curs1, edit->curs_row, start_column, end_column);
 783         edit_draw_this_char (edit, prev_curs, prev_curs_row, start_column, end_column);
 784     }
 785
 786     edit->force = 0;
 787
 788     prev_curs_row = edit->curs_row;
 789     prev_curs = edit->curs1;
 790 }
 791
 792 /* --------------------------------------------------------------------------------------------- */
 793
 794 static inline void
 795 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 796 {
 797     if (page)                   /* if it was an expose event, 'page' would be set */
 798         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 799
 800     if (edit->force & REDRAW_COMPLETELY)
 801         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 802     render_edit_text (edit, row_start, col_start, row_end, col_end);
 803     /*
 804      * edit->force != 0 means a key was pending and the redraw
 805      * was halted, so next time we must redraw everything in case stuff
 806      * was left undrawn from a previous key press.
 807      */
 808     if (edit->force)
 809         edit->force |= REDRAW_PAGE;
 810 }
 811
 812 /* --------------------------------------------------------------------------------------------- */
 813 /*** public functions ****************************************************************************/
 814 /* --------------------------------------------------------------------------------------------- */
 815
 816 /** Draw the status line at the top of the screen. The size of the filename
 817  * field varies depending on the width of the screen and the length of
 818  * the filename. */
 819 void
 820 edit_status (WEdit * edit)
 821 {
 822     const int w = edit->widget.owner->cols;
 823     const size_t status_size = w + 1;
 824     char *const status = g_malloc (status_size);
 825     int status_len;
 826     const char *fname = "";
 827     int fname_len;
 828     const int gap = 3;          /* between the filename and the status */
 829     const int right_gap = 5;    /* at the right end of the screen */
 830     const int preferred_fname_len = 16;
 831
 832     status_string (edit, status, status_size);
 833     status_len = (int) str_term_width1 (status);
 834
 835     if (edit->filename_vpath != NULL)
 836         fname = vfs_path_get_last_path_str (edit->filename_vpath);
 837
 838     fname_len = str_term_width1 (fname);
 839     if (fname_len < preferred_fname_len)
 840         fname_len = preferred_fname_len;
 841
 842     if (fname_len + gap + status_len + right_gap >= w)
 843     {
 844         if (preferred_fname_len + gap + status_len + right_gap >= w)
 845             fname_len = preferred_fname_len;
 846         else
 847             fname_len = w - (gap + status_len + right_gap);
 848         fname = str_trunc (fname, fname_len);
 849     }
 850
 851     dlg_move (edit->widget.owner, 0, 0);
 852     tty_setcolor (STATUSBAR_COLOR);
 853     printwstr (fname, fname_len + gap);
 854     printwstr (status, w - (fname_len + gap));
 855
 856     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 857     {
 858         size_t percent = 100;
 859
 860         if (edit->total_lines + 1 != 0)
 861             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 862         dlg_move (edit->widget.owner, 0, w - 5);
 863         tty_printf (" %3d%%", percent);
 864     }
 865
 866     g_free (status);
 867 }
 868
 869 /* --------------------------------------------------------------------------------------------- */
 870 /** this scrolls the text so that cursor is on the screen */
 871 void
 872 edit_scroll_screen_over_cursor (WEdit * edit)
 873 {
 874     long p;
 875     long outby;
 876     int b_extreme, t_extreme, l_extreme, r_extreme;
 877
 878     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 879         return;
 880
 881     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 882     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET;
 883
 884     r_extreme = EDIT_RIGHT_EXTREME;
 885     l_extreme = EDIT_LEFT_EXTREME;
 886     b_extreme = EDIT_BOTTOM_EXTREME;
 887     t_extreme = EDIT_TOP_EXTREME;
 888     if (edit->found_len != 0)
 889     {
 890         b_extreme = max (edit->widget.lines / 4, b_extreme);
 891         t_extreme = max (edit->widget.lines / 4, t_extreme);
 892     }
 893     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 894     {
 895         int n;
 896
 897         n = b_extreme + t_extreme;
 898         if (n == 0)
 899             n = 1;
 900         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 901         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 902     }
 903     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 904     {
 905         int n;
 906
 907         n = l_extreme + t_extreme;
 908         if (n == 0)
 909             n = 1;
 910         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 911         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 912     }
 913     p = edit_get_col (edit) + edit->over_col;
 914     edit_update_curs_row (edit);
 915     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 916     if (outby > 0)
 917         edit_scroll_right (edit, outby);
 918     outby = l_extreme - p - edit->start_col;
 919     if (outby > 0)
 920         edit_scroll_left (edit, outby);
 921     p = edit->curs_row;
 922     outby = p - edit->widget.lines + 1 + b_extreme;
 923     if (outby > 0)
 924         edit_scroll_downward (edit, outby);
 925     outby = t_extreme - p;
 926     if (outby > 0)
 927         edit_scroll_upward (edit, outby);
 928     edit_update_curs_row (edit);
 929
 930     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET;
 931     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 932 }
 933
 934 /* --------------------------------------------------------------------------------------------- */
 935
 936 void
 937 edit_render_keypress (WEdit * edit)
 938 {
 939     edit_render (edit, 0, 0, 0, 0, 0);
 940 }
 941
 942 /* --------------------------------------------------------------------------------------------- */