about summary refs log blame commit diff stats
path: root/examples/fish_automatic_cd.fish
blob: d097ddd1b7c5045e01844a82e1c471dbeef410b4 (plain) (tree) 
885b7a7f ^







3f31b468 ^



0e6f244e ^







3f31b468 ^

885b7a7f ^


0e6f244e ^

1
2
3
4
5
6
7

8
9
10

11
12
13
14
15
16
17

18

19
20

21







                                                                                


                                                                               






                                     
                  

                                                                         
                  
# Automatically change the directory in fish after closing ranger
#
# This is a fish alias to automatically change the directory to the last visited
# one after ranger quits.
# To undo the effect of this function, you can type "cd -" to return to the
# original directory.
#
# Note: funcsave save the alias in fish's config files, you do not need to copy
# this file anywhere, just execute it once

function ranger-cd
    set dir (mktemp -t ranger_cd.XXX)
    ranger --choosedir=$dir
    cd (cat $dir) $argv
    rm $dir
    commandline -f repaint
end
funcsave ranger-cd

# To bind Ctrl-O to ranger-cd, save this in `~/.config/fish/config.fish`:
bind \co ranger-cd
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-23 09:02:04 +0000
58 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 
-- text editor, particularly text drawing, horizontal wrap, vertical scrolling
Text = {}

-- draw a line starting from startpos to screen at y between State.left and State.right
-- return y for the next line, and position of start of final screen line drawn
function Text.draw(State, line_index, y, startpos)
--?   print('text.draw', line_index, y)
  local line = State.lines[line_index]
  local line_cache = State.line_cache[line_index]
  line_cache.starty = y
  line_cache.startpos = startpos
  -- wrap long lines
  local final_screen_line_starting_pos = startpos  -- track value to return
  Text.populate_screen_line_starting_pos(State, line_index)
  assert(#line_cache.screen_line_starting_pos >= 1)
  for i=1,#line_cache.screen_line_starting_pos do
    local pos = line_cache.screen_line_starting_pos[i]
    if pos < startpos then
      -- render nothing
    else
      final_screen_line_starting_pos = pos
      local screen_line = Text.screen_line(line, line_cache, i)
--?       print('text.draw:', screen_line, 'at', line_index,pos, 'after', x,y)
      local frag_len = utf8.len(screen_line)
      -- render any highlights
      if State.selection1.line then
        local lo, hi = Text.clip_selection(State, line_index, pos, pos+frag_len)
        Text.draw_highlight(State, line, State.left,y, pos, lo,hi)
      end
      if line_index == State.cursor1.line then
        -- render search highlight or cursor
        if State.search_term then
          local data = State.lines[State.cursor1.line].data
          local cursor_offset = Text.offset(data, State.cursor1.pos)
          if data:sub(cursor_offset, cursor_offset+#State.search_term-1) == State.search_term then
            local save_selection = State.selection1
            State.selection1 = {line=line_index, pos=State.cursor1.pos+utf8.len(State.search_term)}
            local lo, hi = Text.clip_selection(State, line_index, pos, pos+frag_len)
            Text.draw_highlight(State, line, State.left,y, pos, lo,hi)
            State.selection1 = save_selection
          end
        else
          if pos <= State.cursor1.pos and pos + frag_len > State.cursor1.pos then
            Text.draw_cursor(State, State.left+Text.x(screen_line, State.cursor1.pos-pos+1), y)
          elseif pos + frag_len == State.cursor1.pos then
            -- Show cursor at end of line.
            -- This place also catches end of wrapping screen lines. That doesn't seem worth distinguishing.
            -- It seems useful to see a cursor whether your eye is on the left or right margin.
            Text.draw_cursor(State, State.left+Text.x(screen_line, State.cursor1.pos-pos+1), y)
          end
        end
      end
      -- render fragment
      App.color(Text_color)
      App.screen.print(screen_line, State.left,y)
      y = y + State.line_height
      if y >= App.screen.height then
        break
      end
    end
  end
  return y, final_screen_line_starting_pos
end

function Text.screen_line(line, line_cache, i)
  local pos = line_cache.screen_line_starting_pos[i]
  local offset = Text.offset(line.data, pos)
  if i >= #line_cache.screen_line_starting_pos then
    return line.data:sub(offset)
  end
  local endpos = line_cache.screen_line_starting_pos[i+1]-1
  local end_offset = Text.offset(line.data, endpos)
  return line.data:sub(offset, end_offset)
end

function Text.draw_cursor(State, x, y)
  -- blink every 0.5s
  if math.floor(Cursor_time*2)%2 == 0 then
    App.color(Cursor_color)
    love.graphics.rectangle('fill', x,y, 3,State.line_height)
  end
  State.cursor_x = x
  State.cursor_y = y+State.line_height
end

function Text.populate_screen_line_starting_pos(State, line_index)
  local line = State.lines[line_index]
  if line.mode ~= 'text' then return end
  local line_cache = State.line_cache[line_index]
  if line_cache.screen_line_starting_pos then
    return
  end
  line_cache.screen_line_starting_pos = {1}
  local x = 0
  local pos = 1
  -- try to wrap at word boundaries
  for frag in line.data:gmatch('%S*%s*') do
    local frag_width = App.width(frag)
--?     print('-- frag:', frag, pos, x, frag_width, State.width)
    while x + frag_width > State.width do
--?       print('frag:', frag, pos, x, frag_width, State.width)
      if x < 0.8 * State.width then
        -- long word; chop it at some letter
        -- We're not going to reimplement TeX here.
        local bpos = Text.nearest_pos_less_than(frag, State.width - x)
        -- everything works if bpos == 0, but is a little inefficient
        pos = pos + bpos
        local boffset = Text.offset(frag, bpos+1)  -- byte _after_ bpos
        frag = string.sub(frag, boffset)
--?         if bpos > 0 then
--?           print('after chop:', frag)
--?         end
        frag_width = App.width(frag)
      end
--?       print('screen line:', pos)
      table.insert(line_cache.screen_line_starting_pos, pos)
      x = 0  -- new screen line
    end
    x = x + frag_width
    pos = pos + utf8.len(frag)
  end
end

function Text.text_input(State, t)
  if App.mouse_down(1) then return end
  if App.ctrl_down() or App.alt_down() or App.cmd_down() then return end
  local before = snapshot(State, State.cursor1.line)
--?   print(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
  Text.insert_at_cursor(State, t)
  if State.cursor_y > App.screen.height - State.line_height then
    Text.populate_screen_line_starting_pos(State, State.cursor1.line)
    Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
  end
  record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
end

function Text.insert_at_cursor(State, t)
  assert(State.lines[State.cursor1.line].mode == 'text')
  local byte_offset = Text.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
  State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_offset-1)..t..string.sub(State.lines[State.cursor1.line].data, byte_offset)
  Text.clear_screen_line_cache(State, State.cursor1.line)
  State.cursor1.pos = State.cursor1.pos+1
end

-- Don't handle any keys here that would trigger text_input above.
function Text.keychord_press(State, chord)
--?   print('chord', chord, State.selection1.line, State.selection1.pos)
  --== shortcuts that mutate text
  if chord == 'return' then
    local before_line = State.cursor1.line
    local before = snapshot(State, before_line)
    Text.insert_return(State)
    State.selection1 = {}
    if State.cursor_y > App.screen.height - State.line_height then
      Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
    end
    schedule_save(State)
    record_undo_event(State, {before=before, after=snapshot(State, before_line, State.cursor1.line)})
  elseif chord == 'tab' then
    local before = snapshot(State, State.cursor1.line)
--?     print(State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
    Text.insert_at_cursor(State, '\t')
    if State.cursor_y > App.screen.height - State.line_height then
      Text.populate_screen_line_starting_pos(State, State.cursor1.line)
      Text.snap_cursor_to_bottom_of_screen(State, State.left, State.right)
--?       print('=>', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
    end
    schedule_save(State)
    record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
  elseif chord == 'backspace' then
    if State.selection1.line then
      Text.delete_selection(State, State.left, State.right)
      schedule_save(State)
      return
    end
    local before
    if State.cursor1.pos > 1 then
      before = snapshot(State, State.cursor1.line)
      local byte_start = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos-1)
      local byte_end = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
      if byte_start then
        if byte_end then
          State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)..string.sub(State.lines[State.cursor1.line].data, byte_end)
        else
          State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)
        end
        State.cursor1.pos = State.cursor1.pos-1
      end
    elseif State.cursor1.line > 1 then
      before = snapshot(State, State.cursor1.line-1, State.cursor1.line)
      if State.lines[State.cursor1.line-1].mode == 'drawing' then
        table.remove(State.lines, State.cursor1.line-1)
        table.remove(State.line_cache, State.cursor1.line-1)
      else
        -- join lines
        State.cursor1.pos = utf8.len(State.lines[State.cursor1.line-1].data)+1
        State.lines[State.cursor1.line-1].data = State.lines[State.cursor1.line-1].data..State.lines[State.cursor1.line].data
        table.remove(State.lines, State.cursor1.line)
        table.remove(State.line_cache, State.cursor1.line)
      end
      State.cursor1.line = State.cursor1.line-1
    end
    if State.screen_top1.line > #State.lines then
      Text.populate_screen_line_starting_pos(State, #State.lines)
      local line_cache = State.line_cache[#State.line_cache]
      State.screen_top1 = {line=#State.lines, pos=line_cache.screen_line_starting_pos[#line_cache.screen_line_starting_pos]}
    elseif Text.lt1(State.cursor1, State.screen_top1) then
      State.screen_top1 = {
        line=State.cursor1.line,
        pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
      }
      Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
    end
    Text.clear_screen_line_cache(State, State.cursor1.line)
    assert(Text.le1(State.screen_top1, State.cursor1))
    schedule_save(State)
    record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
  elseif chord == 'delete' then
    if State.selection1.line then
      Text.delete_selection(State, State.left, State.right)
      schedule_save(State)
      return
    end
    local before
    if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
      before = snapshot(State, State.cursor1.line)
    else
      before = snapshot(State, State.cursor1.line, State.cursor1.line+1)
    end
    if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
      local byte_start = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
      local byte_end = utf8.offset(State.lines[State.cursor1.line].data, State.cursor1.pos+1)
      if byte_start then
        if byte_end then
          State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)..string.sub(State.lines[State.cursor1.line].data, byte_end)
        else
          State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_start-1)
        end
        -- no change to State.cursor1.pos
      end
    elseif State.cursor1.line < #State.lines then
      if State.lines[State.cursor1.line+1].mode == 'text' then
        -- join lines
        State.lines[State.cursor1.line].data = State.lines[State.cursor1.line].data..State.lines[State.cursor1.line+1].data
      end
      table.remove(State.lines, State.cursor1.line+1)
      table.remove(State.line_cache, State.cursor1.line+1)
    end
    Text.clear_screen_line_cache(State, State.cursor1.line)
    schedule_save(State)
    record_undo_event(State, {before=before, after=snapshot(State, State.cursor1.line)})
  --== shortcuts that move the cursor
  elseif chord == 'left' then
    Text.left(State)
    State.selection1 = {}
  elseif chord == 'right' then
    Text.right(State)
    State.selection1 = {}
  elseif chord == 'S-left' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.left(State)
  elseif chord == 'S-right' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.right(State)
  -- C- hotkeys reserved for drawings, so we'll use M-
  elseif chord == 'M-left' then
    Text.word_left(State)
    State.selection1 = {}
  elseif chord == 'M-right' then
    Text.word_right(State)
    State.selection1 = {}
  elseif chord == 'M-S-left' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.word_left(State)
  elseif chord == 'M-S-right' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.word_right(State)
  elseif chord == 'home' then
    Text.start_of_line(State)
    State.selection1 = {}
  elseif chord == 'end' then
    Text.end_of_line(State)
    State.selection1 = {}
  elseif chord == 'S-home' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.start_of_line(State)
  elseif chord == 'S-end' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.end_of_line(State)
  elseif chord == 'up' then
    Text.up(State)
    State.selection1 = {}
  elseif chord == 'down' then
    Text.down(State)
    State.selection1 = {}
  elseif chord == 'S-up' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.up(State)
  elseif chord == 'S-down' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.down(State)
  elseif chord == 'pageup' then
    Text.pageup(State)
    State.selection1 = {}
  elseif chord == 'pagedown' then
    Text.pagedown(State)
    State.selection1 = {}
  elseif chord == 'S-pageup' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.pageup(State)
  elseif chord == 'S-pagedown' then
    if State.selection1.line == nil then
      State.selection1 = {line=State.cursor1.line, pos=State.cursor1.pos}
    end
    Text.pagedown(State)
  end
end

function Text.insert_return(State)
  local byte_offset = Text.offset(State.lines[State.cursor1.line].data, State.cursor1.pos)
  table.insert(State.lines, State.cursor1.line+1, {mode='text', data=string.sub(State.lines[State.cursor1.line].data, byte_offset)})
  table.insert(State.line_cache, State.cursor1.line+1, {})
  State.lines[State.cursor1.line].data = string.sub(State.lines[State.cursor1.line].data, 1, byte_offset-1)
  Text.clear_screen_line_cache(State, State.cursor1.line)
  State.cursor1 = {line=State.cursor1.line+1, pos=1}
end

function Text.pageup(State)
--?   print('pageup')
  -- duplicate some logic from love.draw
  local top2 = Text.to2(State, State.screen_top1)
--?   print(App.screen.height)
  local y = App.screen.height - State.line_height
  while y >= State.top do
--?     print(y, top2.line, top2.screen_line, top2.screen_pos)
    if State.screen_top1.line == 1 and State.screen_top1.pos == 1 then break end
    if State.lines[State.screen_top1.line].mode == 'text' then
      y = y - State.line_height
    elseif State.lines[State.screen_top1.line].mode == 'drawing' then
      y = y - Drawing_padding_height - Drawing.pixels(State.lines[State.screen_top1.line].h, State.width)
    end
    top2 = Text.previous_screen_line(State, top2)
  end
  State.screen_top1 = Text.to1(State, top2)
  State.cursor1 = {line=State.screen_top1.line, pos=State.screen_top1.pos}
  Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
--?   print(State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos)
--?   print('pageup end')
end

function Text.pagedown(State)
--?   print('pagedown')
  -- If a line/paragraph gets to a page boundary, I often want to scroll
  -- before I get to the bottom.
  -- However, only do this if it makes forward progress.
  local bot2 = Text.to2(State, State.screen_bottom1)
  if bot2.screen_line > 1 then
    bot2.screen_line = math.max(bot2.screen_line-10, 1)
  end
  local new_top1 = Text.to1(State, bot2)
  if Text.lt1(State.screen_top1, new_top1) then
    State.screen_top1 = new_top1
  else
    State.screen_top1 = {line=State.screen_bottom1.line, pos=State.screen_bottom1.pos}
  end
--?   print('setting top to', State.screen_top1.line, State.screen_top1.pos)
  State.cursor1 = {line=State.screen_top1.line, pos=State.screen_top1.pos}
  Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
--?   print('top now', State.screen_top1.line)
  Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
--?   print('pagedown end')
end

function Text.up(State)
  assert(State.lines[State.cursor1.line].mode == 'text')
--?   print('up', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos)
  local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)
  if screen_line_starting_pos == 1 then
--?     print('cursor is at first screen line of its line')
    -- line is done; skip to previous text line
    local new_cursor_line = State.cursor1.line
    while new_cursor_line > 1 do
      new_cursor_line = new_cursor_line-1
      if State.lines[new_cursor_line].mode == 'text' then
--?         print('found previous text line')
        State.cursor1 = {line=new_cursor_line, pos=nil}
        Text.populate_screen_line_starting_pos(State, State.cursor1.line)
        -- previous text line found, pick its final screen line
--?         print('has multiple screen lines')
        local screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos
--?         print(#screen_line_starting_pos)
        screen_line_starting_pos = screen_line_starting_pos[#screen_line_starting_pos]
        local screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, screen_line_starting_pos)
        local s = string.sub(State.lines[State.cursor1.line].data, screen_line_starting_byte_offset)
        State.cursor1.pos = screen_line_starting_pos + Text.nearest_cursor_pos(s, State.cursor_x, State.left) - 1
        break
      end
    end
  else
    -- move up one screen line in current line
    assert(screen_line_index > 1)
    local new_screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos[screen_line_index-1]
    local new_screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, new_screen_line_starting_pos)
    local s = string.sub(State.lines[State.cursor1.line].data, new_screen_line_starting_byte_offset)
    State.cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, State.cursor_x, State.left) - 1
--?     print('cursor pos is now '..tostring(State.cursor1.pos))
  end
  if Text.lt1(State.cursor1, State.screen_top1) then
    State.screen_top1 = {
      line=State.cursor1.line,
      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
    }
    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
  end
end

function Text.down(State)
  assert(State.lines[State.cursor1.line].mode == 'text')
--?   print('down', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
  assert(State.cursor1.pos)
  if Text.cursor_at_final_screen_line(State) then
    -- line is done, skip to next text line
--?     print('cursor at final screen line of its line')
    local new_cursor_line = State.cursor1.line
    while new_cursor_line < #State.lines do
      new_cursor_line = new_cursor_line+1
      if State.lines[new_cursor_line].mode == 'text' then
        State.cursor1 = {
          line = new_cursor_line,
          pos = Text.nearest_cursor_pos(State.lines[new_cursor_line].data, State.cursor_x, State.left),
        }
--?         print(State.cursor1.pos)
        break
      end
    end
    if State.cursor1.line > State.screen_bottom1.line then
--?       print('screen top before:', State.screen_top1.line, State.screen_top1.pos)
--?       print('scroll up preserving cursor')
      Text.snap_cursor_to_bottom_of_screen(State)
--?       print('screen top after:', State.screen_top1.line, State.screen_top1.pos)
    end
  else
    -- move down one screen line in current line
    local scroll_down = Text.le1(State.screen_bottom1, State.cursor1)
--?     print('cursor is NOT at final screen line of its line')
    local screen_line_starting_pos, screen_line_index = Text.pos_at_start_of_screen_line(State, State.cursor1)
    Text.populate_screen_line_starting_pos(State, State.cursor1.line)
    local new_screen_line_starting_pos = State.line_cache[State.cursor1.line].screen_line_starting_pos[screen_line_index+1]
--?     print('switching pos of screen line at cursor from '..tostring(screen_line_starting_pos)..' to '..tostring(new_screen_line_starting_pos))
    local new_screen_line_starting_byte_offset = Text.offset(State.lines[State.cursor1.line].data, new_screen_line_starting_pos)
    local s = string.sub(State.lines[State.cursor1.line].data, new_screen_line_starting_byte_offset)
    State.cursor1.pos = new_screen_line_starting_pos + Text.nearest_cursor_pos(s, State.cursor_x, State.left) - 1
--?     print('cursor pos is now', State.cursor1.line, State.cursor1.pos)
    if scroll_down then
--?       print('scroll up preserving cursor')
      Text.snap_cursor_to_bottom_of_screen(State)
--?       print('screen top after:', State.screen_top1.line, State.screen_top1.pos)
    end
  end
--?   print('=>', State.cursor1.line, State.cursor1.pos, State.screen_top1.line, State.screen_top1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
end

function Text.start_of_line(State)
  State.cursor1.pos = 1
  if Text.lt1(State.cursor1, State.screen_top1) then
    State.screen_top1 = {line=State.cursor1.line, pos=State.cursor1.pos}  -- copy
  end
end

function Text.end_of_line(State)
  State.cursor1.pos = utf8.len(State.lines[State.cursor1.line].data) + 1
  if Text.cursor_out_of_screen(State) then
    Text.snap_cursor_to_bottom_of_screen(State)
  end
end

function Text.word_left(State)
  -- skip some whitespace
  while true do
    if State.cursor1.pos == 1 then
      break
    end
    if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos-1, '%S') then
      break
    end
    Text.left(State)
  end
  -- skip some non-whitespace
  while true do
    Text.left(State)
    if State.cursor1.pos == 1 then
      break
    end
    assert(State.cursor1.pos > 1)
    if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos-1, '%s') then
      break
    end
  end
end

function Text.word_right(State)
  -- skip some whitespace
  while true do
    if State.cursor1.pos > utf8.len(State.lines[State.cursor1.line].data) then
      break
    end
    if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos, '%S') then
      break
    end
    Text.right_without_scroll(State)
  end
  while true do
    Text.right_without_scroll(State)
    if State.cursor1.pos > utf8.len(State.lines[State.cursor1.line].data) then
      break
    end
    if Text.match(State.lines[State.cursor1.line].data, State.cursor1.pos, '%s') then
      break
    end
  end
  if Text.cursor_out_of_screen(State) then
    Text.snap_cursor_to_bottom_of_screen(State)
  end
end

function Text.match(s, pos, pat)
  local start_offset = Text.offset(s, pos)
  assert(start_offset)
  local end_offset = Text.offset(s, pos+1)
  assert(end_offset > start_offset)
  local curr = s:sub(start_offset, end_offset-1)
  return curr:match(pat)
end

function Text.left(State)
  assert(State.lines[State.cursor1.line].mode == 'text')
  if State.cursor1.pos > 1 then
    State.cursor1.pos = State.cursor1.pos-1
  else
    local new_cursor_line = State.cursor1.line
    while new_cursor_line > 1 do
      new_cursor_line = new_cursor_line-1
      if State.lines[new_cursor_line].mode == 'text' then
        State.cursor1 = {
          line = new_cursor_line,
          pos = utf8.len(State.lines[new_cursor_line].data) + 1,
        }
        break
      end
    end
  end
  if Text.lt1(State.cursor1, State.screen_top1) then
    State.screen_top1 = {
      line=State.cursor1.line,
      pos=Text.pos_at_start_of_screen_line(State, State.cursor1),
    }
    Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
  end
end

function Text.right(State)
  Text.right_without_scroll(State)
  if Text.cursor_out_of_screen(State) then
    Text.snap_cursor_to_bottom_of_screen(State)
  end
end

function Text.right_without_scroll(State)
  assert(State.lines[State.cursor1.line].mode == 'text')
  if State.cursor1.pos <= utf8.len(State.lines[State.cursor1.line].data) then
    State.cursor1.pos = State.cursor1.pos+1
  else
    local new_cursor_line = State.cursor1.line
    while new_cursor_line <= #State.lines-1 do
      new_cursor_line = new_cursor_line+1
      if State.lines[new_cursor_line].mode == 'text' then
        State.cursor1 = {line=new_cursor_line, pos=1}
        break
      end
    end
  end
end

-- result: pos, index of screen line
function Text.pos_at_start_of_screen_line(State, loc1)
  Text.populate_screen_line_starting_pos(State, loc1.line)
  local line_cache = State.line_cache[loc1.line]
  for i=#line_cache.screen_line_starting_pos,1,-1 do
    local spos = line_cache.screen_line_starting_pos[i]
    if spos <= loc1.pos then
      return spos,i
    end
  end
  assert(false)
end

function Text.pos_at_end_of_screen_line(State, loc1)
  Text.populate_screen_line_starting_pos(State, loc1.line)
  local line_cache = State.line_cache[loc1.line]
  local most_recent_final_pos = utf8.len(State.lines[loc1.line].data)+1
  for i=#line_cache.screen_line_starting_pos,1,-1 do
    local spos = line_cache.screen_line_starting_pos[i]
    if spos <= loc1.pos then
      return most_recent_final_pos
    end
    most_recent_final_pos = spos-1
  end
  assert(false)
end

function Text.cursor_at_final_screen_line(State)
  Text.populate_screen_line_starting_pos(State, State.cursor1.line)
  local screen_lines = State.line_cache[State.cursor1.line].screen_line_starting_pos
--?   print(screen_lines[#screen_lines], State.cursor1.pos)
  return screen_lines[#screen_lines] <= State.cursor1.pos
end

function Text.move_cursor_down_to_next_text_line_while_scrolling_again_if_necessary(State)
  local y = State.top
  while State.cursor1.line <= #State.lines do
    if State.lines[State.cursor1.line].mode == 'text' then
      break
    end
--?     print('cursor skips', State.cursor1.line)
    y = y + Drawing_padding_height + Drawing.pixels(State.lines[State.cursor1.line].h, State.width)
    State.cursor1.line = State.cursor1.line + 1
  end
  if State.cursor1.pos == nil then
    State.cursor1.pos = 1
  end
  -- hack: insert a text line at bottom of file if necessary
  if State.cursor1.line > #State.lines then
    assert(State.cursor1.line == #State.lines+1)
    table.insert(State.lines, {mode='text', data=''})
    table.insert(State.line_cache, {})
  end
--?   print(y, App.screen.height, App.screen.height-State.line_height)
  if y > App.screen.height - State.line_height then
--?     print('scroll up')
    Text.snap_cursor_to_bottom_of_screen(State)
  end
end

-- should never modify State.cursor1
function Text.snap_cursor_to_bottom_of_screen(State)
--?   print('to2:', State.cursor1.line, State.cursor1.pos)
  local top2 = Text.to2(State, State.cursor1)
--?   print('to2: =>', top2.line, top2.screen_line, top2.screen_pos)
  -- slide to start of screen line
  top2.screen_pos = 1  -- start of screen line
--?   print('snap', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
--?   print('cursor pos '..tostring(State.cursor1.pos)..' is on the #'..tostring(top2.screen_line)..' screen line down')
  local y = App.screen.height - State.line_height
  -- duplicate some logic from love.draw
  while true do
--?     print(y, 'top2:', top2.line, top2.screen_line, top2.screen_pos)
    if top2.line == 1 and top2.screen_line == 1 then break end
    if top2.screen_line > 1 or State.lines[top2.line-1].mode == 'text' then
      local h = State.line_height
      if y - h < State.top then
        break
      end
      y = y - h
    else
      assert(top2.line > 1)
      assert(State.lines[top2.line-1].mode == 'drawing')
      -- We currently can't draw partial drawings, so either skip it entirely
      -- or not at all.
      local h = Drawing_padding_height + Drawing.pixels(State.lines[top2.line-1].h, State.width)
      if y - h < State.top then
        break
      end
--?       print('skipping drawing of height', h)
      y = y - h
    end
    top2 = Text.previous_screen_line(State, top2)
  end
--?   print('top2 finally:', top2.line, top2.screen_line, top2.screen_pos)
  State.screen_top1 = Text.to1(State, top2)
--?   print('top1 finally:', State.screen_top1.line, State.screen_top1.pos)
--?   print('snap =>', State.screen_top1.line, State.screen_top1.pos, State.cursor1.line, State.cursor1.pos, State.screen_bottom1.line, State.screen_bottom1.pos)
  Text.redraw_all(State)  -- if we're scrolling, reclaim all fragments to avoid memory leaks
end

function Text.in_line(State, line_index, x,y)
  local line = State.lines[line_index]
  local line_cache = State.line_cache[line_index]
  if line_cache.starty == nil then return false end  -- outside current page
  if y < line_cache.starty then return false end
  Text.populate_screen_line_starting_pos(State, line_index)
  return y < line_cache.starty + State.line_height*(#line_cache.screen_line_starting_pos - Text.screen_line_index(line_cache.screen_line_starting_pos, line_cache.startpos) + 1)
end

-- convert mx,my in pixels to schema-1 coordinates
function Text.to_pos_on_line(State, line_index, mx, my)
  local line = State.lines[line_index]
  local line_cache = State.line_cache[line_index]
  assert(my >= line_cache.starty)
  -- duplicate some logic from Text.draw
  local y = line_cache.starty
  local start_screen_line_index = Text.screen_line_index(line_cache.screen_line_starting_pos, line_cache.startpos)
  for screen_line_index = start_screen_line_index,#line_cache.screen_line_starting_pos do
    local screen_line_starting_pos = line_cache.screen_line_starting_pos[screen_line_index]
    local screen_line_starting_byte_offset = Text.offset(line.data, screen_line_starting_pos)
--?     print('iter', y, screen_line_index, screen_line_starting_pos, string.sub(line.data, screen_line_starting_byte_offset))
    local nexty = y + State.line_height
    if my < nexty then
      -- On all wrapped screen lines but the final one, clicks past end of
      -- line position cursor on final character of screen line.
      -- (The final screen line positions past end of screen line as always.)
      if screen_line_index < #line_cache.screen_line_starting_pos and mx > State.left + Text.screen_line_width(State, line_index, screen_line_index) then
--?         print('past end of non-final line; return')
        return line_cache.screen_line_starting_pos[screen_line_index+1]-1
      end
      local s = string.sub(line.data, screen_line_starting_byte_offset)
--?       print('return', mx, Text.nearest_cursor_pos(s, mx, State.left), '=>', screen_line_starting_pos + Text.nearest_cursor_pos(s, mx, State.left) - 1)
      return screen_line_starting_pos + Text.nearest_cursor_pos(s, mx, State.left) - 1
    end
    y = nexty
  end
  assert(false)
end

function Text.screen_line_width(State, line_index, i)
  local line = State.lines[line_index]
  local line_cache = State.line_cache[line_index]
  local start_pos = line_cache.screen_line_starting_pos[i]
  local start_offset = Text.offset(line.data, start_pos)
  local screen_line
  if i < #line_cache.screen_line_starting_pos then
    local past_end_pos = line_cache.screen_line_starting_pos[i+1]
    local past_end_offset = Text.offset(line.data, past_end_pos)
    screen_line = string.sub(line.data, start_offset, past_end_offset-1)
  else
    screen_line = string.sub(line.data, start_pos)
  end
  return App.width(screen_line)
end

function Text.screen_line_index(screen_line_starting_pos, pos)
  for i = #screen_line_starting_pos,1,-1 do
    if screen_line_starting_pos[i] <= pos then
      return i
    end
  end
end

-- convert x pixel coordinate to pos
-- oblivious to wrapping
-- result: 1 to len+1
function Text.nearest_cursor_pos(line, x, left)
  if x < left then
    return 1
  end
  local len = utf8.len(line)
  local max_x = left+Text.x(line, len+1)
  if x > max_x then
    return len+1
  end
  local leftpos, rightpos = 1, len+1
--?   print('-- nearest', x)
  while true do
--?     print('nearest', x, '^'..line..'$', leftpos, rightpos)
    if leftpos == rightpos then
      return leftpos
    end
    local curr = math.floor((leftpos+rightpos)/2)
    local currxmin = left+Text.x(line, curr)
    local currxmax = left+Text.x(line, curr+1)
--?     print('nearest', x, leftpos, rightpos, curr, currxmin, currxmax)
    if currxmin <= x and x < currxmax then
      if x-currxmin < currxmax-x then
        return curr
      else
        return curr+1
      end
    end
    if leftpos >= rightpos-1 then
      return rightpos
    end
    if currxmin > x then
      rightpos = curr
    else
      leftpos = curr
    end
  end
  assert(false)
end

-- return the nearest index of line (in utf8 code points) which lies entirely
-- within x pixels of the left margin
-- result: 0 to len+1
function Text.nearest_pos_less_than(line, x)
--?   print('', '-- nearest_pos_less_than', line, x)
  local len = utf8.len(line)
  local max_x = Text.x_after(line, len)
  if x > max_x then
    return len+1
  end
  local left, right = 0, len+1
  while true do
    local curr = math.floor((left+right)/2)
    local currxmin = Text.x_after(line, curr+1)
    local currxmax = Text.x_after(line, curr+2)
--?     print('', x, left, right, curr, currxmin, currxmax)
    if currxmin <= x and x < currxmax then
      return curr
    end
    if left >= right-1 then
      return left
    end
    if currxmin > x then
      right = curr
    else
      left = curr
    end
  end
  assert(false)
end

function Text.x_after(s, pos)
  local offset = Text.offset(s, math.min(pos+1, #s+1))
  local s_before = s:sub(1, offset-1)
--?   print('^'..s_before..'$')
  return App.width(s_before)
end

function Text.x(s, pos)
  local offset = Text.offset(s, pos)
  local s_before = s:sub(1, offset-1)
  return App.width(s_before)
end

function Text.to2(State, loc1)
  if State.lines[loc1.line].mode == 'drawing' then
    return {line=loc1.line, screen_line=1, screen_pos=1}
  end
  local result = {line=loc1.line}
  local line_cache = State.line_cache[loc1.line]
  Text.populate_screen_line_starting_pos(State, loc1.line)
  for i=#line_cache.screen_line_starting_pos,1,-1 do
    local spos = line_cache.screen_line_starting_pos[i]
    if spos <= loc1.pos then
      result.screen_line = i
      result.screen_pos = loc1.pos - spos + 1
      break
    end
  end
  assert(result.screen_pos)
  return result
end

function Text.to1(State, loc2)
  local result = {line=loc2.line, pos=loc2.screen_pos}
  if loc2.screen_line > 1 then
    result.pos = State.line_cache[loc2.line].screen_line_starting_pos[loc2.screen_line] + loc2.screen_pos - 1
  end
  return result
end

function Text.eq1(a, b)
  return a.line == b.line and a.pos == b.pos
end

function Text.lt1(a, b)
  if a.line < b.line then
    return true
  end
  if a.line > b.line then
    return false
  end
  return a.pos < b.pos
end

function Text.le1(a, b)
  if a.line < b.line then
    return true
  end
  if a.line > b.line then
    return false
  end
  return a.pos <= b.pos
end

function Text.offset(s, pos1)
  if pos1 == 1 then return 1 end
  local result = utf8.offset(s, pos1)
  if result == nil then
    print(pos1, #s, s)
  end
  assert(result)
  return result
end

function Text.previous_screen_line(State, loc2)
  if loc2.screen_line > 1 then
    return {line=loc2.line, screen_line=loc2.screen_line-1, screen_pos=1}
  elseif loc2.line == 1 then
    return loc2
  elseif State.lines[loc2.line-1].mode == 'drawing' then
    return {line=loc2.line-1, screen_line=1, screen_pos=1}
  else
    local l = State.lines[loc2.line-1]
    Text.populate_screen_line_starting_pos(State, loc2.line-1)
    return {line=loc2.line-1, screen_line=#State.line_cache[loc2.line-1].screen_line_starting_pos, screen_pos=1}
  end
end

-- resize helper
function Text.tweak_screen_top_and_cursor(State)
  if State.screen_top1.pos == 1 then return end
  Text.populate_screen_line_starting_pos(State, State.screen_top1.line)
  local line = State.lines[State.screen_top1.line]
  local line_cache = State.line_cache[State.screen_top1.line]
  for i=2,#line_cache.screen_line_starting_pos do
    local pos = line_cache.screen_line_starting_pos[i]
    if pos == State.screen_top1.pos then
      break
    end
    if pos > State.screen_top1.pos then
      -- make sure screen top is at start of a screen line
      local prev = line_cache.screen_line_starting_pos[i-1]
      if State.screen_top1.pos - prev < pos - State.screen_top1.pos then
        State.screen_top1.pos = prev
      else
        State.screen_top1.pos = pos
      end
      break
    end
  end
  -- make sure cursor is on screen
  if Text.lt1(State.cursor1, State.screen_top1) then
    State.cursor1 = {line=State.screen_top1.line, pos=State.screen_top1.pos}
  elseif State.cursor1.line >= State.screen_bottom1.line then
--?     print('too low')
    if Text.cursor_out_of_screen(State) then
--?       print('tweak')
      State.cursor1 = {
          line=State.screen_bottom1.line,
          pos=Text.to_pos_on_line(State, State.screen_bottom1.line, State.right-5, App.screen.height-5),
      }
    end
  end
end

-- slightly expensive since it redraws the screen
function Text.cursor_out_of_screen(State)
  edit.draw(State)
  return State.cursor_y == nil
  -- this approach is cheaper and almost works, except on the final screen
  -- where file ends above bottom of screen
--?   local botpos = Text.pos_at_start_of_screen_line(State, State.cursor1)
--?   local botline1 = {line=State.cursor1.line, pos=botpos}
--?   return Text.lt1(State.screen_bottom1, botline1)
end

function Text.redraw_all(State)
--?   print('clearing fragments')
  State.line_cache = {}
  for i=1,#State.lines do
    State.line_cache[i] = {}
  end
end

function Text.clear_screen_line_cache(State, line_index)
  State.line_cache[line_index].screen_line_starting_pos = nil
end

function trim(s)
  return s:gsub('^%s+', ''):gsub('%s+$', '')
end

function ltrim(s)
  return s:gsub('^%s+', '')
end

function rtrim(s)
  return s:gsub('%s+$', '')
end

function starts_with(s, prefix)
  if #s < #prefix then
    return false
  end
  for i=1,#prefix do
    if s:sub(i,i) ~= prefix:sub(i,i) then
      return false
    end
  end
  return true
end

function ends_with(s, suffix)
  if #s < #suffix then
    return false
  end
  for i=0,#suffix-1 do
    if s:sub(#s-i,#s-i) ~= suffix:sub(#suffix-i,#suffix-i) then
      return false
    end
  end
  return true
end
generated by cgit-pink 1.4.1-2-gfad0 (git 2.36.2.497.gbbea4dcf42) at 2024-12-23 09:02:04 +0000