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text-editor.lua
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local fenster = require('fenster')
-- Define the microknight font
local microknight_font = {
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0x18, 0x0c, 0x1b, 0x03, 0x0c, 0x00, 0x00, 0xc0, 0x30, 0x18, 0x39, 0x1b, 0x07, 0x80, 0x00, 0x00,
0x20, 0x33, 0x00, 0x04, 0x0f, 0x83, 0xc0, 0x20, 0x40, 0x66, 0x4e, 0x00, 0x0c, 0xc7, 0xe3, 0xc0,
0xc6, 0x63, 0x31, 0x98, 0xcc, 0xc6, 0x60, 0xf0, 0x78, 0x3c, 0x1e, 0x0f, 0x07, 0x81, 0xb6, 0x60,
0xc6, 0x63, 0x31, 0x98, 0xcc, 0x66, 0xe0, 0x18, 0x0c, 0x06, 0x03, 0x01, 0x80, 0xc7, 0xf6, 0x00,
0xc6, 0x63, 0x31, 0x8f, 0x8f, 0xc6, 0x31, 0xf8, 0xfc, 0x7e, 0x3f, 0x1f, 0x8f, 0xcd, 0x86, 0x00,
0xc6, 0x63, 0x31, 0x81, 0x8c, 0x06, 0x33, 0x19, 0x8c, 0xc6, 0x63, 0x31, 0x98, 0xcd, 0x86, 0x30,
0x7c, 0x3e, 0x1f, 0x01, 0x8c, 0x06, 0xe1, 0xf8, 0xfc, 0x7e, 0x3f, 0x1f, 0x8f, 0xc7, 0xf3, 0xe0,
0x00, 0x00, 0x00, 0x00, 0x0c, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x80,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x30, 0x0c, 0x0c, 0x0d, 0x83, 0x00, 0xc0, 0x60, 0xd8, 0x0c, 0x39, 0x0c, 0x03, 0x01, 0x83, 0x90,
0x08, 0x10, 0x33, 0x00, 0x00, 0x81, 0x01, 0x98, 0x00, 0x16, 0x4e, 0x02, 0x04, 0x06, 0x64, 0xe0,
0x78, 0x3c, 0x1e, 0x0f, 0x03, 0x81, 0xc0, 0xe0, 0x70, 0x3e, 0x7c, 0x1e, 0x0f, 0x07, 0x83, 0xc0,
0xfc, 0x7e, 0x3f, 0x1f, 0x81, 0x80, 0xc0, 0x60, 0x30, 0x66, 0x66, 0x33, 0x19, 0x8c, 0xc6, 0x60,
0xc0, 0x60, 0x30, 0x18, 0x01, 0x80, 0xc0, 0x60, 0x30, 0xc6, 0x63, 0x31, 0x98, 0xcc, 0x66, 0x30,
0xc6, 0x63, 0x31, 0x98, 0xc1, 0x80, 0xc0, 0x60, 0x30, 0xc6, 0x63, 0x31, 0x98, 0xcc, 0x66, 0x30,
0x7c, 0x3e, 0x1f, 0x0f, 0x87, 0xe3, 0xf1, 0xf8, 0xfc, 0x7e, 0x63, 0x1f, 0x0f, 0x87, 0xc3, 0xe0,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x6c, 0x00, 0x00, 0x06, 0x01, 0x80, 0xc1, 0xb0, 0x30, 0xc0, 0x36, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x0c, 0x1e, 0x01, 0x02, 0x03, 0x30, 0x00, 0x40, 0xc0, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x78, 0x00, 0x33, 0x18, 0xcc, 0x66, 0x33, 0x19, 0x8c, 0xf8, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00,
0xcc, 0x3f, 0x37, 0x98, 0xcc, 0x66, 0x33, 0x19, 0x8c, 0xcc, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00,
0xc6, 0x00, 0x3d, 0x98, 0xcc, 0x66, 0x33, 0x19, 0x8c, 0xc6, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00,
0xc6, 0x0c, 0x39, 0x98, 0xcc, 0x66, 0x33, 0x18, 0xfc, 0xfc, 0x3f, 0x00, 0x00, 0x00, 0x00, 0x00,
0x7c, 0x00, 0x1f, 0x0f, 0xc7, 0xe3, 0xf1, 0xf8, 0x0c, 0xc0, 0x03, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xf8, 0xc0, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
}
-- Define the microknight layout
local microknight_layout = {
{ 0, 0 }, { 9, 0 }, { 18, 0 }, { 27, 0 }, { 36, 0 }, { 45, 0 }, { 54, 0 }, { 63, 0 }, { 72, 0 }, { 81, 0 }, { 90, 0 },
{ 99, 0 }, { 108, 0 }, { 117, 0 }, { 0, 9 }, { 9, 9 }, { 18, 9 }, { 27, 9 }, { 36, 9 }, { 45, 9 }, { 54, 9 },
{ 63, 9 }, { 72, 9 }, { 81, 9 }, { 90, 9 }, { 99, 9 }, { 108, 9 }, { 117, 9 }, { 0, 18 }, { 9, 18 }, { 18, 18 },
{ 27, 18 }, { 36, 18 }, { 45, 18 }, { 54, 18 }, { 63, 18 }, { 72, 18 }, { 81, 18 }, { 90, 18 }, { 99, 18 },
{ 108, 18 }, { 117, 18 }, { 0, 27 }, { 9, 27 }, { 18, 27 }, { 27, 27 }, { 36, 27 }, { 45, 27 }, { 54, 27 }, { 63, 27 },
{ 72, 27 }, { 81, 27 }, { 90, 27 }, { 99, 27 }, { 108, 27 }, { 117, 27 }, { 0, 36 }, { 9, 36 }, { 18, 36 },
{ 27, 36 }, { 36, 36 }, { 45, 36 }, { 54, 36 }, { 63, 36 }, { 72, 36 }, { 81, 36 }, { 90, 36 }, { 99, 36 },
{ 108, 36 }, { 117, 36 }, { 0, 45 }, { 9, 45 }, { 18, 45 }, { 27, 45 }, { 36, 45 }, { 45, 45 }, { 54, 45 },
{ 63, 45 }, { 72, 45 }, { 81, 45 }, { 90, 45 }, { 99, 45 }, { 108, 45 }, { 117, 45 }, { 0, 54 }, { 9, 54 }, { 18, 54 },
{ 27, 54 }, { 36, 54 }, { 45, 54 }, { 54, 54 }, { 63, 54 },
{ 72, 54 }, { 81, 54 }, { 90, 54 }, { 99, 54 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 }, { 0, 0 },
{ 0, 0 }, { 0, 0 }, { 108, 54 }, { 117, 54 }, { 0, 63 }, { 9, 63 }, { 18, 63 }, { 27, 63 }, { 36, 63 }, { 45, 63 },
{ 54, 63 }, { 63, 63 }, { 72, 63 }, { 81, 63 }, { 90, 63 }, { 99, 63 }, { 108, 63 }, { 117, 63 }, { 0, 72 }, { 9, 72 },
{ 18, 72 }, { 27, 72 }, { 36, 72 }, { 45, 72 }, { 54, 72 }, { 63, 72 }, { 72, 72 }, { 81, 72 }, { 90, 72 }, { 99, 72 },
{ 108, 72 }, { 117, 72 }, { 0, 81 }, { 9, 81 }, { 18, 81 }, { 27, 81 }, { 36, 81 }, { 45, 81 }, { 54, 81 }, { 63, 81 },
{ 72, 81 }, { 81, 81 }, { 90, 81 }, { 99, 81 }, { 108, 81 }, { 117, 81 }, { 0, 90 }, { 9, 90 }, { 18, 90 },
{ 27, 90 }, { 36, 90 }, { 45, 90 }, { 54, 90 }, { 63, 90 }, { 72, 90 }, { 81, 90 }, { 90, 90 }, { 99, 90 },
{ 108, 90 }, { 117, 90 }, { 0, 99 }, { 9, 99 }, { 18, 99 }, { 27, 99 }, { 36, 99 }, { 45, 99 }, { 54, 99 }, { 63, 99 },
{ 72, 99 }, { 81, 99 }, { 90, 99 }, { 99, 99 }, { 108, 99 }, { 117, 99 }, { 0, 108 }, { 9, 108 }, { 18, 108 },
{ 27, 108 }, { 36, 108 }, { 45, 108 }, { 54, 108 }, { 63, 108 }, { 72, 108 }, { 81, 108 }, { 90, 108 }, { 99, 108 },
{ 108, 108 }, { 117, 108 }, { 0, 117 }, { 9, 117 }, { 18, 117 }, { 27, 117 }, { 36, 117 }, { 45, 117 }, { 54, 117 },
{ 63, 117 }, { 72, 117 }, { 81, 117 },
}
-- Calculate the microknight texture
local microknight_texture = {} ---@type integer[]
for _, t in ipairs(microknight_font) do
local bits = {} ---@type number[]
for b = 8, 1, -1 do
bits[b] = math.fmod(t, 2)
t = math.floor((t - bits[b]) / 2)
end
microknight_texture[#microknight_texture + 1] = bits[1] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[2] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[3] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[4] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[5] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[6] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[7] == 0 and 0x000000 or 0xffffff
microknight_texture[#microknight_texture + 1] = bits[8] == 0 and 0x000000 or 0xffffff
end
-- Define the height/width of each microknight character
local microknight_size = 8
---Draw text using the microknight font (8x8 pixels per character)
---@param window window*
---@param text string
---@param x integer
---@param y integer
local function draw_text(window, text, x, y)
for character in text:gmatch('.') do
local index = character:byte() - 31
if index > #microknight_layout then
index = 0
end
local layout = microknight_layout[index]
local texture_offset = (layout[2] * 128) + layout[1]
for fy = 0, microknight_size do
for fx = 0, microknight_size do
local texture_index = texture_offset + (fy * 128) + fx
window:set(
x + fx,
y + fy,
microknight_texture[texture_index + 1]
)
end
end
x = x + microknight_size
end
end
-- Define the key mappings
local escape_key = 27
local enter_key = 10
local backspace_key = 8
local character_keys = {
[' '] = 32,
["'"] = 39,
[','] = 44,
['-'] = 45,
['.'] = 46,
['/'] = 47,
['0'] = 48,
['1'] = 49,
['2'] = 50,
['3'] = 51,
['4'] = 52,
['5'] = 53,
['6'] = 54,
['7'] = 55,
['8'] = 56,
['9'] = 57,
[';'] = 59,
['='] = 61,
a = 65,
b = 66,
c = 67,
d = 68,
e = 69,
f = 70,
g = 71,
h = 72,
i = 73,
j = 74,
k = 75,
l = 76,
m = 77,
n = 78,
o = 79,
p = 80,
q = 81,
r = 82,
s = 83,
t = 84,
u = 85,
v = 86,
w = 87,
x = 88,
y = 89,
z = 90,
['['] = 91,
['\\'] = 92,
[']'] = 93,
['`'] = 96,
}
local character_uppercase_map = {
["'"] = '"',
[','] = '<',
['-'] = '_',
['.'] = '>',
['/'] = '?',
['1'] = '!',
['2'] = '@',
['3'] = '#',
['4'] = '$',
['5'] = '%',
['6'] = '^',
['7'] = '&',
['8'] = '*',
['9'] = '(',
['0'] = ')',
[';'] = ':',
['='] = '+',
['['] = '{',
['\\'] = '|',
[']'] = '}',
['`'] = '~',
}
-- Text settings
local text_offset_x = 16
local text_offset_y = 16
local text_line_height = microknight_size * 2
local max_text_line_length = 80 -- should be higher than 30
local max_text_lines = 30
-- Open a window
local window_width = text_offset_x + microknight_size * max_text_line_length +
text_offset_x
local window_height = text_offset_y + text_line_height * (max_text_lines - 1) +
microknight_size + text_offset_y
local window = fenster.open(window_width, window_height, 'Text Demo')
-- Draw instructions
draw_text(
window,
'Type anything'
.. string.rep(' ', max_text_line_length - 30)
.. 'Press ESC to exit',
text_offset_x,
text_offset_y + text_line_height * 0
)
draw_text(
window,
string.rep('-', max_text_line_length),
text_offset_x,
text_offset_y + text_line_height * 1
)
-- Main loop
local typed_text_lines = { '' }
local curr_line = 1
while window:loop() and not window.keys[escape_key] do
local keys = window.keys
-- Get text input and draw the new text when needed
local pressed_key ---@type integer
if keys[enter_key] then
pressed_key = enter_key
-- Check if we are under the line limit
if curr_line + 1 < max_text_lines - 1 then
-- Go to the next line and initialize if needed
curr_line = curr_line + 1
typed_text_lines[curr_line] = typed_text_lines[curr_line] or ''
end
elseif keys[backspace_key] then
pressed_key = backspace_key
-- Check if we are at the first position any line under the first
if #typed_text_lines[curr_line] == 0 and curr_line > 1 then
-- Return to the previous line
curr_line = curr_line - 1
else
-- Remove last character from text
typed_text_lines[curr_line] = typed_text_lines[curr_line]:sub(1, -2)
-- Clear last character from window
local start_x = text_offset_x + #typed_text_lines[curr_line] * microknight_size
local start_y = text_offset_y + text_line_height * (curr_line + 1)
for y = start_y, start_y + microknight_size do
for x = start_x, start_x + microknight_size do
window:set(x, y, 0x000000)
end
end
end
else
-- Loop through all character keys (keys that add text)
for key, code in pairs(character_keys) do
if keys[code] then
pressed_key = code
-- Check if line is at max length
if #typed_text_lines[curr_line] + 1 > max_text_line_length then
break
end
-- Get the character to print
local character = window.modshift
and (character_uppercase_map[key] or key:upper())
or key
-- Draw new character
draw_text(
window,
character,
text_offset_x + #typed_text_lines[curr_line] * microknight_size,
text_offset_y + text_line_height * (curr_line + 1)
)
-- Add new character to text line
typed_text_lines[curr_line] = typed_text_lines[curr_line] .. character
break
end
end
end
-- Wait until pressed key was released
if pressed_key then
while window:loop() and window.keys[pressed_key] do
--
end
end
end