src/editor/editdraw.c

   1 /* editor text drawing.
   2
   3    Copyright (C) 1996, 1997, 1998, 2001, 2002, 2003, 2004, 2005, 2006,
   4    2007 Free Software Foundation, Inc.
   5
   6    Authors: 1996, 1997 Paul Sheer
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 2 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program; if not, write to the Free Software
  20    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  21    02110-1301, USA.
  22  */
  23
  24 /** \file
  25  *  \brief Source: editor text drawing
  26  *  \author Paul Sheer
  27  *  \date 1996, 1997
  28  */
  29
  30 #include <config.h>
  31 #include <stdlib.h>
  32 #include <stdio.h>
  33 #include <stdarg.h>
  34 #include <sys/types.h>
  35 #include <unistd.h>
  36 #include <string.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <sys/stat.h>
  40
  41 #include "lib/global.h"
  42 #include "lib/tty/tty.h"        /* tty_printf() */
  43 #include "lib/tty/key.h"        /* is_idle() */
  44 #include "lib/skin.h"
  45 #include "lib/strutil.h"        /* utf string functions */
  46 #include "lib/util.h"           /* is_printable() */
  47 #include "lib/widget.h"         /* buttonbar_redraw() */
  48 #include "lib/charsets.h"
  49
  50 #include "src/main.h"           /* source_codepage */
  51 #include "src/setup.h"          /* edit_tab_spacing */
  52
  53 #include "edit-impl.h"
  54 #include "edit-widget.h"
  55
  56 /*** global variables ****************************************************************************/
  57
  58 /* Toggles statusbar draw style */
  59 int simple_statusbar = 0;
  60
  61 int visible_tabs = 1, visible_tws = 1;
  62
  63 /*** file scope macro definitions ****************************************************************/
  64
  65 #define MAX_LINE_LEN 1024
  66
  67 /* Text styles */
  68 #define MOD_ABNORMAL            (1 << 8)
  69 #define MOD_BOLD                (1 << 9)
  70 #define MOD_MARKED              (1 << 10)
  71 #define MOD_CURSOR              (1 << 11)
  72 #define MOD_WHITESPACE          (1 << 12)
  73
  74 #define FONT_OFFSET_X 0
  75 #define FONT_OFFSET_Y 0
  76 #define FIXED_FONT 1
  77 #define FONT_PIX_PER_LINE 1
  78 #define FONT_MEAN_WIDTH 1
  79
  80 #define edit_move(x,y) widget_move(edit, y, x);
  81
  82 #define key_pending(x) (!is_idle())
  83
  84 #define EDITOR_MINIMUM_TERMINAL_WIDTH 30
  85
  86
  87 /*** file scope type declarations ****************************************************************/
  88
  89 struct line_s
  90 {
  91     unsigned int ch;
  92     unsigned int style;
  93 };
  94
  95 /*** file scope variables ************************************************************************/
  96
  97 /*** file scope functions ************************************************************************/
  98 /* --------------------------------------------------------------------------------------------- */
  99
 100 static inline void
 101 status_string (WEdit * edit, char *s, int w)
 102 {
 103     char byte_str[16];
 104     unsigned char cur_byte = 0;
 105     unsigned int cur_utf = 0;
 106     int cw = 1;
 107
 108     /*
 109      * If we are at the end of file, print <EOF>,
 110      * otherwise print the current character as is (if printable),
 111      * as decimal and as hex.
 112      */
 113     if (edit->curs1 < edit->last_byte)
 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             cur_utf = edit_get_utf (edit, edit->curs1, &cw);
 125             if (cw > 0)
 126             {
 127                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 128                             (unsigned) cur_utf, (unsigned) cur_utf);
 129             }
 130             else
 131             {
 132                 cur_utf = edit_get_byte (edit, edit->curs1);
 133                 g_snprintf (byte_str, sizeof (byte_str), "%04d 0x%03X",
 134                             (int) cur_utf, (unsigned) cur_utf);
 135             }
 136
 137         }
 138     }
 139     else
 140     {
 141         strcpy (byte_str, "<EOF>     ");
 142     }
 143
 144     /* The field lengths just prevent the status line from shortening too much */
 145     if (simple_statusbar)
 146         g_snprintf (s, w,
 147                     "%c%c%c%c %3ld %5ld/%ld %6ld/%ld %s %s",
 148                     edit->mark1 != edit->mark2 ? (edit->column_highlight ? 'C' : 'B') : '-',
 149                     edit->modified ? 'M' : '-',
 150                     edit->macro_i < 0 ? '-' : 'R',
 151                     edit->overwrite == 0 ? '-' : 'O',
 152                     edit->curs_col + edit->over_col,
 153                     edit->curs_line + 1,
 154                     edit->total_lines + 1, edit->curs1, edit->last_byte, byte_str,
 155 #ifdef HAVE_CHARSET
 156                     source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 157 #else
 158                     ""
 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                     edit->macro_i < 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, edit->curs1, edit->last_byte, byte_str,
 173 #ifdef HAVE_CHARSET
 174                     source_codepage >= 0 ? get_codepage_id (source_codepage) : ""
 175 #else
 176                     ""
 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
 204     tty_setcolor (EDITOR_NORMAL_COLOR);
 205     if (bookmarked != 0)
 206         tty_setcolor (bookmarked);
 207
 208     if (!show_right_margin)
 209     {
 210         int len;
 211
 212         len = end_col + 1 - start_col;
 213         if (len > 0)
 214             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 215     }
 216     else if (edit->start_col < option_word_wrap_line_length)
 217     {
 218         int len;
 219
 220         len = option_word_wrap_line_length - edit->start_col;
 221         if (len > 0)
 222         {
 223             tty_draw_hline (edit->widget.y + y, edit->widget.x + x1, ' ', len);
 224
 225             len = end_col + 1 - start_col;
 226             if (len > 0)
 227             {
 228                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 229                 tty_draw_hline (edit->widget.y + y,
 230                                 edit->widget.x + x1 + option_word_wrap_line_length +
 231                                 edit->start_col, ' ', len);
 232             }
 233         }
 234     }
 235
 236     if (option_line_state)
 237     {
 238         for (i = 0; i < LINE_STATE_WIDTH; i++)
 239             if (status[i] == '\0')
 240                 status[i] = ' ';
 241
 242         tty_setcolor (LINE_STATE_COLOR);
 243         edit_move (x1 + FONT_OFFSET_X - option_line_state_width, y + FONT_OFFSET_Y);
 244         tty_print_string (status);
 245     }
 246
 247     edit_move (x1 + FONT_OFFSET_X, y + FONT_OFFSET_Y);
 248     p = line;
 249     i = 1;
 250     while (p->ch)
 251     {
 252         int style;
 253         unsigned int textchar;
 254         int color;
 255
 256         if (cols_to_skip)
 257         {
 258             p++;
 259             cols_to_skip--;
 260             continue;
 261         }
 262
 263         style = p->style & 0xFF00;
 264         textchar = p->ch;
 265         color = p->style >> 16;
 266
 267         if (style & MOD_ABNORMAL)
 268         {
 269             /* Non-printable - use black background */
 270             color = 0;
 271         }
 272
 273         if (style & MOD_WHITESPACE)
 274         {
 275             if (style & MOD_MARKED)
 276             {
 277                 textchar = ' ';
 278                 tty_setcolor (EDITOR_MARKED_COLOR);
 279             }
 280             else
 281             {
 282 #if 0
 283                 if (color != EDITOR_NORMAL_COLOR)
 284                 {
 285                     textchar = ' ';
 286                     tty_lowlevel_setcolor (color);
 287                 }
 288                 else
 289 #endif
 290                     tty_setcolor (EDITOR_WHITESPACE_COLOR);
 291             }
 292         }
 293         else
 294         {
 295             if (style & MOD_BOLD)
 296             {
 297                 tty_setcolor (EDITOR_BOLD_COLOR);
 298             }
 299             else if (style & MOD_MARKED)
 300             {
 301                 tty_setcolor (EDITOR_MARKED_COLOR);
 302             }
 303             else
 304             {
 305                 tty_lowlevel_setcolor (color);
 306             }
 307         }
 308         if (show_right_margin)
 309         {
 310             if (i > option_word_wrap_line_length + edit->start_col)
 311                 tty_setcolor (EDITOR_RIGHT_MARGIN_COLOR);
 312             i++;
 313         }
 314         tty_print_anychar (textchar);
 315         p++;
 316     }
 317 }
 318
 319 /* --------------------------------------------------------------------------------------------- */
 320 /** b is a pointer to the beginning of the line */
 321
 322 static void
 323 edit_draw_this_line (WEdit * edit, long b, long row, long start_col, long end_col)
 324 {
 325     struct line_s line[MAX_LINE_LEN];
 326     struct line_s *p = line;
 327
 328     long m1 = 0, m2 = 0, q, c1, c2;
 329     int col, start_col_real;
 330     unsigned int c;
 331     int color;
 332     int abn_style;
 333     int i;
 334     int utf8lag = 0;
 335     unsigned int cur_line = 0;
 336     int book_mark = 0;
 337     char line_stat[LINE_STATE_WIDTH + 1];
 338
 339     if (row > edit->widget.lines - EDIT_TEXT_VERTICAL_OFFSET)
 340         return;
 341
 342     if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_COLOR))
 343         book_mark = BOOK_MARK_COLOR;
 344     else if (book_mark_query_color (edit, edit->start_line + row, BOOK_MARK_FOUND_COLOR))
 345         book_mark = BOOK_MARK_FOUND_COLOR;
 346
 347     if (book_mark)
 348         abn_style = book_mark << 16;
 349     else
 350         abn_style = MOD_ABNORMAL;
 351
 352     end_col -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 353
 354     edit_get_syntax_color (edit, b - 1, &color);
 355     q = edit_move_forward3 (edit, b, start_col - edit->start_col, 0);
 356     start_col_real = (col = (int) edit_move_forward3 (edit, b, 0, q)) + edit->start_col;
 357     if (option_line_state)
 358     {
 359         cur_line = edit->start_line + row;
 360         if (cur_line <= (unsigned int) edit->total_lines)
 361         {
 362             g_snprintf (line_stat, LINE_STATE_WIDTH + 1, "%7i ", cur_line + 1);
 363         }
 364         else
 365         {
 366             memset (line_stat, ' ', LINE_STATE_WIDTH);
 367             line_stat[LINE_STATE_WIDTH] = '\0';
 368         }
 369         if (book_mark_query_color (edit, cur_line, BOOK_MARK_COLOR))
 370         {
 371             g_snprintf (line_stat, 2, "*");
 372         }
 373     }
 374
 375     if (col + 16 > -edit->start_col)
 376     {
 377         eval_marks (edit, &m1, &m2);
 378
 379         if (row <= edit->total_lines - edit->start_line)
 380         {
 381             long tws = 0;
 382             if (tty_use_colors () && visible_tws)
 383             {
 384                 tws = edit_eol (edit, b);
 385                 while (tws > b && ((c = edit_get_byte (edit, tws - 1)) == ' ' || c == '\t'))
 386                     tws--;
 387             }
 388
 389             while (col <= end_col - edit->start_col)
 390             {
 391                 int cw = 1;
 392
 393                 p->ch = 0;
 394                 p->style = 0;
 395                 if (q == edit->curs1)
 396                     p->style |= MOD_CURSOR;
 397                 if (q >= m1 && q < m2)
 398                 {
 399                     if (edit->column_highlight)
 400                     {
 401                         int x;
 402                         x = edit_move_forward3 (edit, b, 0, q);
 403                         c1 = min (edit->column1, edit->column2);
 404                         c2 = max (edit->column1, edit->column2);
 405                         if (x >= c1 && x < c2)
 406                             p->style |= MOD_MARKED;
 407                     }
 408                     else
 409                         p->style |= MOD_MARKED;
 410                 }
 411                 if (q == edit->bracket)
 412                     p->style |= MOD_BOLD;
 413                 if (q >= edit->found_start && q < edit->found_start + edit->found_len)
 414                     p->style |= MOD_BOLD;
 415
 416                 if (!edit->utf8)
 417                 {
 418                     c = edit_get_byte (edit, q);
 419                 }
 420                 else
 421                 {
 422                     c = edit_get_utf (edit, q, &cw);
 423                 }
 424                 /* we don't use bg for mc - fg contains both */
 425                 if (book_mark)
 426                 {
 427                     p->style |= book_mark << 16;
 428                 }
 429                 else
 430                 {
 431                     edit_get_syntax_color (edit, q, &color);
 432                     p->style |= color << 16;
 433                 }
 434                 switch (c)
 435                 {
 436                 case '\n':
 437                     col = (end_col + utf8lag) - edit->start_col + 1;    /* quit */
 438                     break;
 439                 case '\t':
 440                     i = TAB_SIZE - ((int) col % TAB_SIZE);
 441                     col += i;
 442                     if (tty_use_colors () &&
 443                         ((visible_tabs || (visible_tws && q >= tws)) && enable_show_tabs_tws))
 444                     {
 445                         if (p->style & MOD_MARKED)
 446                             c = p->style;
 447                         else if (book_mark)
 448                             c |= book_mark << 16;
 449                         else
 450                             c = p->style | MOD_WHITESPACE;
 451                         if (i > 2)
 452                         {
 453                             p->ch = '<';
 454                             p->style = c;
 455                             p++;
 456                             while (--i > 1)
 457                             {
 458                                 p->ch = '-';
 459                                 p->style = c;
 460                                 p++;
 461                             }
 462                             p->ch = '>';
 463                             p->style = c;
 464                             p++;
 465                         }
 466                         else if (i > 1)
 467                         {
 468                             p->ch = '<';
 469                             p->style = c;
 470                             p++;
 471                             p->ch = '>';
 472                             p->style = c;
 473                             p++;
 474                         }
 475                         else
 476                         {
 477                             p->ch = '>';
 478                             p->style = c;
 479                             p++;
 480                         }
 481                     }
 482                     else if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 483                     {
 484                         p->ch = '.';
 485                         p->style |= MOD_WHITESPACE;
 486                         c = p->style & ~MOD_CURSOR;
 487                         p++;
 488                         while (--i)
 489                         {
 490                             p->ch = ' ';
 491                             p->style = c;
 492                             p++;
 493                         }
 494                     }
 495                     else
 496                     {
 497                         p->ch |= ' ';
 498                         c = p->style & ~MOD_CURSOR;
 499                         p++;
 500                         while (--i)
 501                         {
 502                             p->ch = ' ';
 503                             p->style = c;
 504                             p++;
 505                         }
 506                     }
 507                     break;
 508                 case ' ':
 509                     if (tty_use_colors () && visible_tws && q >= tws && enable_show_tabs_tws)
 510                     {
 511                         p->ch = '.';
 512                         p->style |= MOD_WHITESPACE;
 513                         p++;
 514                         col++;
 515                         break;
 516                     }
 517                     /* fallthrough */
 518                 default:
 519 #ifdef HAVE_CHARSET
 520                     if (utf8_display)
 521                     {
 522                         if (!edit->utf8)
 523                         {
 524                             c = convert_from_8bit_to_utf_c ((unsigned char) c, edit->converter);
 525                         }
 526                     }
 527                     else if (edit->utf8)
 528                         c = convert_from_utf_to_current_c (c, edit->converter);
 529                     else
 530 #endif
 531                         c = convert_to_display_c (c);
 532
 533                     /* Caret notation for control characters */
 534                     if (c < 32)
 535                     {
 536                         p->ch = '^';
 537                         p->style = abn_style;
 538                         p++;
 539                         p->ch = c + 0x40;
 540                         p->style = abn_style;
 541                         p++;
 542                         col += 2;
 543                         break;
 544                     }
 545                     if (c == 127)
 546                     {
 547                         p->ch = '^';
 548                         p->style = abn_style;
 549                         p++;
 550                         p->ch = '?';
 551                         p->style = abn_style;
 552                         p++;
 553                         col += 2;
 554                         break;
 555                     }
 556                     if (!edit->utf8)
 557                     {
 558                         if ((utf8_display && g_unichar_isprint (c)) ||
 559                             (!utf8_display && is_printable (c)))
 560                         {
 561                             p->ch = c;
 562                             p++;
 563                         }
 564                         else
 565                         {
 566                             p->ch = '.';
 567                             p->style = abn_style;
 568                             p++;
 569                         }
 570                     }
 571                     else
 572                     {
 573                         if (g_unichar_isprint (c))
 574                         {
 575                             p->ch = c;
 576                             p++;
 577                         }
 578                         else
 579                         {
 580                             p->ch = '.';
 581                             p->style = abn_style;
 582                             p++;
 583                         }
 584                     }
 585                     col++;
 586                     break;
 587                 }               /* case */
 588
 589                 q++;
 590                 if (cw > 1)
 591                 {
 592                     q += cw - 1;
 593                 }
 594             }
 595         }
 596     }
 597     else
 598     {
 599         start_col_real = start_col = 0;
 600     }
 601
 602     p->ch = '\0';
 603
 604     print_to_widget (edit, row, start_col, start_col_real, end_col, line, line_stat, book_mark);
 605 }
 606
 607 /* --------------------------------------------------------------------------------------------- */
 608
 609 static inline void
 610 edit_draw_this_char (WEdit * edit, long curs, long row)
 611 {
 612     int b = edit_bol (edit, curs);
 613     edit_draw_this_line (edit, b, row, 0, edit->widget.cols - 1);
 614 }
 615
 616 /* --------------------------------------------------------------------------------------------- */
 617 /** cursor must be in screen for other than REDRAW_PAGE passed in force */
 618
 619 static inline void
 620 render_edit_text (WEdit * edit, long start_row, long start_column, long end_row, long end_column)
 621 {
 622     long row = 0, curs_row;
 623     static long prev_curs_row = 0;
 624     static long prev_curs = 0;
 625
 626     int force = edit->force;
 627     long b;
 628
 629     edit->widget.lines = max (edit->widget.lines, 1);
 630     edit->widget.cols = max (edit->widget.cols, 1);
 631
 632     /*
 633      * If the position of the page has not moved then we can draw the cursor
 634      * character only.  This will prevent line flicker when using arrow keys.
 635      */
 636     if ((!(force & REDRAW_CHAR_ONLY)) || (force & REDRAW_PAGE))
 637     {
 638         if (!(force & REDRAW_IN_BOUNDS))
 639         {                       /* !REDRAW_IN_BOUNDS means to ignore bounds and redraw whole rows */
 640             start_row = 0;
 641             end_row = edit->widget.lines - 1;
 642             start_column = 0;
 643             end_column = edit->widget.cols - 1;
 644         }
 645         if (force & REDRAW_PAGE)
 646         {
 647             row = start_row;
 648             b = edit_move_forward (edit, edit->start_display, start_row, 0);
 649             while (row <= end_row)
 650             {
 651                 if (key_pending (edit))
 652                     return;
 653                 edit_draw_this_line (edit, b, row, start_column, end_column);
 654                 b = edit_move_forward (edit, b, 1, 0);
 655                 row++;
 656             }
 657         }
 658         else
 659         {
 660             curs_row = edit->curs_row;
 661
 662             if (force & REDRAW_BEFORE_CURSOR)
 663             {
 664                 if (start_row < curs_row)
 665                 {
 666                     long upto = curs_row - 1 <= end_row ? curs_row - 1 : end_row;
 667                     row = start_row;
 668                     b = edit->start_display;
 669                     while (row <= upto)
 670                     {
 671                         if (key_pending (edit))
 672                             return;
 673                         edit_draw_this_line (edit, b, row, start_column, end_column);
 674                         b = edit_move_forward (edit, b, 1, 0);
 675                     }
 676                 }
 677             }
 678             /*          if (force & REDRAW_LINE)          ---> default */
 679             b = edit_bol (edit, edit->curs1);
 680             if (curs_row >= start_row && curs_row <= end_row)
 681             {
 682                 if (key_pending (edit))
 683                     return;
 684                 edit_draw_this_line (edit, b, curs_row, start_column, end_column);
 685             }
 686             if (force & REDRAW_AFTER_CURSOR)
 687             {
 688                 if (end_row > curs_row)
 689                 {
 690                     row = curs_row + 1 < start_row ? start_row : curs_row + 1;
 691                     b = edit_move_forward (edit, b, 1, 0);
 692                     while (row <= end_row)
 693                     {
 694                         if (key_pending (edit))
 695                             return;
 696                         edit_draw_this_line (edit, b, row, start_column, end_column);
 697                         b = edit_move_forward (edit, b, 1, 0);
 698                         row++;
 699                     }
 700                 }
 701             }
 702             if (force & REDRAW_LINE_ABOVE && curs_row >= 1)
 703             {
 704                 row = curs_row - 1;
 705                 b = edit_move_backward (edit, edit_bol (edit, edit->curs1), 1);
 706                 if (row >= start_row && row <= end_row)
 707                 {
 708                     if (key_pending (edit))
 709                         return;
 710                     edit_draw_this_line (edit, b, row, start_column, end_column);
 711                 }
 712             }
 713             if (force & REDRAW_LINE_BELOW && row < edit->widget.lines - 1)
 714             {
 715                 row = curs_row + 1;
 716                 b = edit_bol (edit, edit->curs1);
 717                 b = edit_move_forward (edit, b, 1, 0);
 718                 if (row >= start_row && row <= end_row)
 719                 {
 720                     if (key_pending (edit))
 721                         return;
 722                     edit_draw_this_line (edit, b, row, start_column, end_column);
 723                 }
 724             }
 725         }
 726     }
 727     else
 728     {
 729         if (prev_curs_row < edit->curs_row)
 730         {                       /* with the new text highlighting, we must draw from the top down */
 731             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 732             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 733         }
 734         else
 735         {
 736             edit_draw_this_char (edit, edit->curs1, edit->curs_row);
 737             edit_draw_this_char (edit, prev_curs, prev_curs_row);
 738         }
 739     }
 740
 741     edit->force = 0;
 742
 743     prev_curs_row = edit->curs_row;
 744     prev_curs = edit->curs1;
 745 }
 746
 747 /* --------------------------------------------------------------------------------------------- */
 748
 749 static inline void
 750 edit_render (WEdit * edit, int page, int row_start, int col_start, int row_end, int col_end)
 751 {
 752     if (page)                   /* if it was an expose event, 'page' would be set */
 753         edit->force |= REDRAW_PAGE | REDRAW_IN_BOUNDS;
 754
 755     if (edit->force & REDRAW_COMPLETELY)
 756         buttonbar_redraw (find_buttonbar (edit->widget.owner));
 757     render_edit_text (edit, row_start, col_start, row_end, col_end);
 758     /*
 759      * edit->force != 0 means a key was pending and the redraw
 760      * was halted, so next time we must redraw everything in case stuff
 761      * was left undrawn from a previous key press.
 762      */
 763     if (edit->force)
 764         edit->force |= REDRAW_PAGE;
 765 }
 766
 767 /* --------------------------------------------------------------------------------------------- */
 768 /*** public functions ****************************************************************************/
 769 /* --------------------------------------------------------------------------------------------- */
 770
 771 /** Draw the status line at the top of the screen. The size of the filename
 772  * field varies depending on the width of the screen and the length of
 773  * the filename. */
 774 void
 775 edit_status (WEdit * edit)
 776 {
 777     const int w = edit->widget.owner->cols;
 778     const size_t status_size = w + 1;
 779     char *const status = g_malloc (status_size);
 780     int status_len;
 781     const char *fname = "";
 782     int fname_len;
 783     const int gap = 3;          /* between the filename and the status */
 784     const int right_gap = 5;    /* at the right end of the screen */
 785     const int preferred_fname_len = 16;
 786
 787     status_string (edit, status, status_size);
 788     status_len = (int) str_term_width1 (status);
 789
 790     if (edit->filename)
 791         fname = edit->filename;
 792     fname_len = str_term_width1 (fname);
 793     if (fname_len < preferred_fname_len)
 794         fname_len = preferred_fname_len;
 795
 796     if (fname_len + gap + status_len + right_gap >= w)
 797     {
 798         if (preferred_fname_len + gap + status_len + right_gap >= w)
 799             fname_len = preferred_fname_len;
 800         else
 801             fname_len = w - (gap + status_len + right_gap);
 802         fname = str_trunc (fname, fname_len);
 803     }
 804
 805     dlg_move (edit->widget.owner, 0, 0);
 806     tty_setcolor (STATUSBAR_COLOR);
 807     printwstr (fname, fname_len + gap);
 808     printwstr (status, w - (fname_len + gap));
 809
 810     if (simple_statusbar && w > EDITOR_MINIMUM_TERMINAL_WIDTH)
 811     {
 812         size_t percent = 100;
 813
 814         if (edit->total_lines + 1 != 0)
 815             percent = (edit->curs_line + 1) * 100 / (edit->total_lines + 1);
 816         dlg_move (edit->widget.owner, 0, w - 5);
 817         tty_printf (" %3d%%", percent);
 818     }
 819
 820     g_free (status);
 821 }
 822
 823 /* --------------------------------------------------------------------------------------------- */
 824 /** this scrolls the text so that cursor is on the screen */
 825 void
 826 edit_scroll_screen_over_cursor (WEdit * edit)
 827 {
 828     int p;
 829     int outby;
 830     int b_extreme, t_extreme, l_extreme, r_extreme;
 831
 832     if (edit->widget.lines <= 0 || edit->widget.cols <= 0)
 833         return;
 834
 835     edit->widget.cols -= EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 836     edit->widget.lines -= EDIT_TEXT_VERTICAL_OFFSET - 1;
 837
 838     r_extreme = EDIT_RIGHT_EXTREME;
 839     l_extreme = EDIT_LEFT_EXTREME;
 840     b_extreme = EDIT_BOTTOM_EXTREME;
 841     t_extreme = EDIT_TOP_EXTREME;
 842     if (edit->found_len)
 843     {
 844         b_extreme = max (edit->widget.lines / 4, b_extreme);
 845         t_extreme = max (edit->widget.lines / 4, t_extreme);
 846     }
 847     if (b_extreme + t_extreme + 1 > edit->widget.lines)
 848     {
 849         int n;
 850
 851         n = b_extreme + t_extreme;
 852         if (n == 0)
 853             n = 1;
 854         b_extreme = (b_extreme * (edit->widget.lines - 1)) / n;
 855         t_extreme = (t_extreme * (edit->widget.lines - 1)) / n;
 856     }
 857     if (l_extreme + r_extreme + 1 > edit->widget.cols)
 858     {
 859         int n;
 860
 861         n = l_extreme + t_extreme;
 862         if (n == 0)
 863             n = 1;
 864         l_extreme = (l_extreme * (edit->widget.cols - 1)) / n;
 865         r_extreme = (r_extreme * (edit->widget.cols - 1)) / n;
 866     }
 867     p = edit_get_col (edit) + edit->over_col;
 868     edit_update_curs_row (edit);
 869     outby = p + edit->start_col - edit->widget.cols + 1 + (r_extreme + edit->found_len);
 870     if (outby > 0)
 871         edit_scroll_right (edit, outby);
 872     outby = l_extreme - p - edit->start_col;
 873     if (outby > 0)
 874         edit_scroll_left (edit, outby);
 875     p = edit->curs_row;
 876     outby = p - edit->widget.lines + 1 + b_extreme;
 877     if (outby > 0)
 878         edit_scroll_downward (edit, outby);
 879     outby = t_extreme - p;
 880     if (outby > 0)
 881         edit_scroll_upward (edit, outby);
 882     edit_update_curs_row (edit);
 883
 884     edit->widget.lines += EDIT_TEXT_VERTICAL_OFFSET - 1;
 885     edit->widget.cols += EDIT_TEXT_HORIZONTAL_OFFSET + option_line_state_width;
 886 }
 887
 888 /* --------------------------------------------------------------------------------------------- */
 889
 890 void
 891 edit_render_keypress (WEdit * edit)
 892 {
 893     edit_render (edit, 0, 0, 0, 0, 0);
 894 }
 895
 896 /* --------------------------------------------------------------------------------------------- */