akkartik/lines-and-links - Change IYW7X3WLOPYLSNO5IQNSULUNO4XFEM24DJ2VB5HPBUKWUYFPRCGQC

left/right cursor movement, deleting characters

Created by Kartik K. Agaram on May 16, 2022

IYW7X3WLOPYLSNO5IQNSULUNO4XFEM24DJ2VB5HPBUKWUYFPRCGQC

Dependencies

In channels

main

Change contents

Replacement in main.lua at line 31 [5.2]

∅:D[4.22] → [5.3:14]

∅:D[6.1237] → [5.3:14]

B:BD[5.2] → [5.3:14]

lines = {}

[6.1237]

[6.1238]

lines = {''}
cursor_line = 1
-- this is a line
-- ^cursor_pos = 1
--  ^cursor_pos = 2
--   ...
--               ^cursor_pos past end of line is 15
cursor_pos = #lines[cursor_line]+1

Replacement in main.lua at line 162 [5.2]

B:BD[7.71] → [3.1:127]

  love.graphics.print('_', 25+text:getWidth()*1.5, y+6)  -- drop the cursor down a bit to account for the increased font size

[7.71]

[5.416]

  local line_before_cursor = lines[cursor_line]:sub(1, cursor_pos-1)
  local text_before_cursor = love.graphics.newText(love.graphics.getFont(), line_before_cursor)
  love.graphics.print('_', 25+text_before_cursor:getWidth()*1.5, y+6)  -- drop the cursor down a bit to account for the increased font size

Replacement in main.lua at line 496 [5.2]

∅:D[8.81] → [4.50:85]

B:BD[4.50] → [4.50:85]

  lines[#lines] = lines[#lines]..t

[8.81]

[2.62]

  local byteoffset
  if cursor_pos > 1 then
    byteoffset = utf8.offset(lines[cursor_line], cursor_pos-1)
  else
    byteoffset = 0
  end
  lines[cursor_line] = string.sub(lines[cursor_line], 1, byteoffset)..t..string.sub(lines[cursor_line], byteoffset+1)
  cursor_pos = cursor_pos+1

Replacement in main.lua at line 519 [5.2]

B:BD[9.148] → [9.148:296]

      local byteoffset = utf8.offset(lines[#lines], -1)
      if byteoffset then
        lines[#lines] = string.sub(lines[#lines], 1, byteoffset-1)

[9.148]

[9.296]

      if cursor_pos > 1 then
        local byte_start = utf8.offset(lines[cursor_line], cursor_pos-1)
        local byte_end = utf8.offset(lines[cursor_line], cursor_pos)
        if byte_start then
          if byte_end then
            lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)..string.sub(lines[cursor_line], byte_end)
          else
            lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)
          end
          cursor_pos = cursor_pos-1
        end
      end
    end
  elseif chord == 'left' then
    if cursor_pos > 1 then
      cursor_pos = cursor_pos - 1
    end
  elseif chord == 'right' then
    if cursor_pos <= #lines[cursor_line] then
      cursor_pos = cursor_pos + 1
    end
  elseif chord == 'delete' then
    if cursor_pos <= #lines[cursor_line] then
      local byte_start = utf8.offset(lines[cursor_line], cursor_pos)
      local byte_end = utf8.offset(lines[cursor_line], cursor_pos+1)
      if byte_start then
        if byte_end then
          lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)..string.sub(lines[cursor_line], byte_end)
        else
          lines[cursor_line] = string.sub(lines[cursor_line], 1, byte_start-1)
        end
        -- no change to cursor_pos