LuaIDE

--
--  Lua IDE
--  Made by GravityScore
--


--  -------- Variables

-- Version
local version = "1.0"
local args = {...}

-- Editing
local w, h = term.getSize()
local tabWidth = 2

local autosaveInterval = 20
local allowEditorEvent = true
local keyboardShortcutTimeout = 0.4

-- Clipboard
local clipboard = nil

-- Theme
local theme = {}

-- Language
local languages = {}
local curLanguage = {}

-- Events
local event_distract = "luaide_distractionEvent"

-- Locations
local updateURL = "https://raw.github.com/GravityScore/LuaIDE/master/luaide.lua"
local ideLocation = "/" .. shell.getRunningProgram()
local themeLocation = "/.LuaIDE-Theme"

local function isAdvanced() return term.isColor and term.isColor() end


--  -------- Utilities

local function modRead(properties)
    local w, h = term.getSize()
    local defaults = {replaceChar = nil, history = nil, visibleLength = nil, textLength = nil,
        liveUpdates = nil, exitOnKey = nil}
    if not properties then properties = {} end
    for k, v in pairs(defaults) do if not properties[k] then properties[k] = v end end
    if properties.replaceChar then properties.replaceChar = properties.replaceChar:sub(1, 1) end
    if not properties.visibleLength then properties.visibleLength = w end

    local sx, sy = term.getCursorPos()
    local line = ""
    local pos = 0
    local historyPos = nil

    local function redraw(repl)
        local scroll = 0
        if properties.visibleLength and sx + pos > properties.visibleLength + 1 then
            scroll = (sx + pos) - (properties.visibleLength + 1)
        end

        term.setCursorPos(sx, sy)
        local a = repl or properties.replaceChar
        if a then term.write(string.rep(a, line:len() - scroll))
        else term.write(line:sub(scroll + 1, -1)) end
        term.setCursorPos(sx + pos - scroll, sy)
    end

    local function sendLiveUpdates(event, ...)
        if type(properties.liveUpdates) == "function" then
            local ox, oy = term.getCursorPos()
            local a, data = properties.liveUpdates(line, event, ...)
            if a == true and data == nil then
                term.setCursorBlink(false)
                return line
            elseif a == true and data ~= nil then
                term.setCursorBlink(false)
                return data
            end
            term.setCursorPos(ox, oy)
        end
    end

    term.setCursorBlink(true)
    while true do
        local e, but, x, y, p4, p5 = os.pullEvent()

        if e == "char" then
            local s = false
            if properties.textLength and line:len() < properties.textLength then s = true
            elseif not properties.textLength then s = true end

            local canType = true
            if not properties.grantPrint and properties.refusePrint then
                local canTypeKeys = {}
                if type(properties.refusePrint) == "table" then
                    for _, v in pairs(properties.refusePrint) do
                        table.insert(canTypeKeys, tostring(v):sub(1, 1))
                    end
                elseif type(properties.refusePrint) == "string" then
                    for char in properties.refusePrint:gmatch(".") do
                        table.insert(canTypeKeys, char)
                    end
                end
                for _, v in pairs(canTypeKeys) do if but == v then canType = false end end
            elseif properties.grantPrint then
                canType = false
                local canTypeKeys = {}
                if type(properties.grantPrint) == "table" then
                    for _, v in pairs(properties.grantPrint) do
                        table.insert(canTypeKeys, tostring(v):sub(1, 1))
                    end
                elseif type(properties.grantPrint) == "string" then
                    for char in properties.grantPrint:gmatch(".") do
                        table.insert(canTypeKeys, char)
                    end
                end
                for _, v in pairs(canTypeKeys) do if but == v then canType = true end end
            end

            if s and canType then
                line = line:sub(1, pos) .. but .. line:sub(pos + 1, -1)
                pos = pos + 1
                redraw()
            end
        elseif e == "key" then
            if but == keys.enter then break
            elseif but == keys.left then if pos > 0 then pos = pos - 1 redraw() end
            elseif but == keys.right then if pos < line:len() then pos = pos + 1 redraw() end
            elseif (but == keys.up or but == keys.down) and properties.history then
                redraw(" ")
                if but == keys.up then
                    if historyPos == nil and #properties.history > 0 then
                        historyPos = #properties.history
                    elseif historyPos > 1 then
                        historyPos = historyPos - 1
                    end
                elseif but == keys.down then
                    if historyPos == #properties.history then historyPos = nil
                    elseif historyPos ~= nil then historyPos = historyPos + 1 end
                end

                if properties.history and historyPos then
                    line = properties.history[historyPos]
                    pos = line:len()
                else
                    line = ""
                    pos = 0
                end

                redraw()
                local a = sendLiveUpdates("history")
                if a then return a end
            elseif but == keys.backspace and pos > 0 then
                redraw(" ")
                line = line:sub(1, pos - 1) .. line:sub(pos + 1, -1)
                pos = pos - 1
                redraw()
                local a = sendLiveUpdates("delete")
                if a then return a end
            elseif but == keys.home then
                pos = 0
                redraw()
            elseif but == keys.delete and pos < line:len() then
                redraw(" ")
                line = line:sub(1, pos) .. line:sub(pos + 2, -1)
                redraw()
                local a = sendLiveUpdates("delete")
                if a then return a end
            elseif but == keys["end"] then
                pos = line:len()
                redraw()
            elseif properties.exitOnKey then
                if but == properties.exitOnKey or (properties.exitOnKey == "control" and
                        (but == 29 or but == 157)) then
                    term.setCursorBlink(false)
                    return nil
                end
            end
        end
        local a = sendLiveUpdates(e, but, x, y, p4, p5)
        if a then return a end
    end

    term.setCursorBlink(false)
    if line ~= nil then line = line:gsub("^%s*(.-)%s*$", "%1") end
    return line
end


--  -------- Themes

local defaultTheme = {
    background = "gray",
    backgroundHighlight = "lightGray",
    prompt = "cyan",
    promptHighlight = "lightBlue",
    err = "red",
    errHighlight = "pink",

    editorBackground = "gray",
    editorLineHightlight = "lightBlue",
    editorLineNumbers = "gray",
    editorLineNumbersHighlight = "lightGray",
    editorError = "pink",
    editorErrorHighlight = "red",

    textColor = "white",
    conditional = "yellow",
    constant = "orange",
    ["function"] = "magenta",
    string = "red",
    comment = "lime"
}

local normalTheme = {
    background = "black",
    backgroundHighlight = "black",
    prompt = "black",
    promptHighlight = "black",
    err = "black",
    errHighlight = "black",

    editorBackground = "black",
    editorLineHightlight = "black",
    editorLineNumbers = "black",
    editorLineNumbersHighlight = "white",
    editorError = "black",
    editorErrorHighlight = "black",

    textColor = "white",
    conditional = "white",
    constant = "white",
    ["function"] = "white",
    string = "white",
    comment = "white"
}

local availableThemes = {
    {"Water (Default)", "https://raw.github.com/GravityScore/LuaIDE/master/themes/default.txt"},
    {"Fire", "https://raw.github.com/GravityScore/LuaIDE/master/themes/fire.txt"},
    {"Sublime Text 2", "https://raw.github.com/GravityScore/LuaIDE/master/themes/st2.txt"},
    {"Midnight", "https://raw.github.com/GravityScore/LuaIDE/master/themes/midnight.txt"},
    {"TheOriginalBIT", "https://raw.github.com/GravityScore/LuaIDE/master/themes/bit.txt"},
    {"Superaxander", "https://raw.github.com/GravityScore/LuaIDE/master/themes/superaxander.txt"},
    {"Forest", "https://raw.github.com/GravityScore/LuaIDE/master/themes/forest.txt"},
    {"Night", "https://raw.github.com/GravityScore/LuaIDE/master/themes/night.txt"},
    {"Original", "https://raw.github.com/GravityScore/LuaIDE/master/themes/original.txt"},
}

local function loadTheme(path)
    local f = io.open(path)
    local l = f:read("*l")
    local config = {}
    while l ~= nil do
        local k, v = string.match(l, "^(%a+)=(%a+)")
        if k and v then config[k] = v end
        l = f:read("*l")
    end
    f:close()
    return config
end

-- Load Theme
if isAdvanced() then theme = defaultTheme
else theme = normalTheme end


--  -------- Drawing

local function centerPrint(text, ny)
    if type(text) == "table" then for _, v in pairs(text) do centerPrint(v) end
    else
        local x, y = term.getCursorPos()
        local w, h = term.getSize()
        term.setCursorPos(w/2 - text:len()/2 + (#text % 2 == 0 and 1 or 0), ny or y)
        print(text)
    end
end

local function title(t)
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.background])
    term.clear()

    term.setBackgroundColor(colors[theme.backgroundHighlight])
    for i = 2, 4 do term.setCursorPos(1, i) term.clearLine() end
    term.setCursorPos(3, 3)
    term.write(t)
end

local function centerRead(wid, begt)
    local function liveUpdate(line, e, but, x, y, p4, p5)
        if isAdvanced() and e == "mouse_click" and x >= w/2 - wid/2 and x <= w/2 - wid/2 + 10
                and y >= 13 and y <= 15 then
            return true, ""
        end
    end

    if not begt then begt = "" end
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.promptHighlight])
    for i = 8, 10 do
        term.setCursorPos(w/2 - wid/2, i)
        term.write(string.rep(" ", wid))
    end

    if isAdvanced() then
        term.setBackgroundColor(colors[theme.errHighlight])
        for i = 13, 15 do
            term.setCursorPos(w/2 - wid/2 + 1, i)
            term.write(string.rep(" ", 10))
        end
        term.setCursorPos(w/2 - wid/2 + 2, 14)
        term.write("> Cancel")
    end

    term.setBackgroundColor(colors[theme.promptHighlight])
    term.setCursorPos(w/2 - wid/2 + 1, 9)
    term.write("> " .. begt)
    return modRead({visibleLength = w/2 + wid/2, liveUpdates = liveUpdate})
end


--  -------- Prompt

local function prompt(list, dir, isGrid)
    local function draw(sel)
        for i, v in ipairs(list) do
            if i == sel then term.setBackgroundColor(v.highlight or colors[theme.promptHighlight])
            else term.setBackgroundColor(v.bg or colors[theme.prompt]) end
            term.setTextColor(v.tc or colors[theme.textColor])
            for i = -1, 1 do
                term.setCursorPos(v[2], v[3] + i)
                term.write(string.rep(" ", v[1]:len() + 4))
            end

            term.setCursorPos(v[2], v[3])
            if i == sel then
                term.setBackgroundColor(v.highlight or colors[theme.promptHighlight])
                term.write(" > ")
            else term.write(" - ") end
            term.write(v[1] .. " ")
        end
    end

    local key1 = dir == "horizontal" and 203 or 200
    local key2 = dir == "horizontal" and 205 or 208
    local sel = 1
    draw(sel)

    while true do
        local e, but, x, y = os.pullEvent()
        if e == "key" and but == 28 then
            return list[sel][1]
        elseif e == "key" and but == key1 and sel > 1 then
            sel = sel - 1
            draw(sel)
        elseif e == "key" and but == key2 and ((err == true and sel < #list - 1) or (sel < #list)) then
            sel = sel + 1
            draw(sel)
        elseif isGrid and e == "key" and but == 203 and sel > 2 then
            sel = sel - 2
            draw(sel)
        elseif isGrid and e == "key" and but == 205 and sel < 3 then
            sel = sel + 2
            draw(sel)
        elseif e == "mouse_click" then
            for i, v in ipairs(list) do
                if x >= v[2] - 1 and x <= v[2] + v[1]:len() + 3 and y >= v[3] - 1 and y <= v[3] + 1 then
                    return list[i][1]
                end
            end
        end
    end
end

local function scrollingPrompt(list)
    local function draw(items, sel, loc)
        for i, v in ipairs(items) do
            local bg = colors[theme.prompt]
            local bghigh = colors[theme.promptHighlight]
            if v:find("Back") or v:find("Return") then
                bg = colors[theme.err]
                bghigh = colors[theme.errHighlight]
            end

            if i == sel then term.setBackgroundColor(bghigh)
            else term.setBackgroundColor(bg) end
            term.setTextColor(colors[theme.textColor])
            for x = -1, 1 do
                term.setCursorPos(3, (i * 4) + x + 4)
                term.write(string.rep(" ", w - 13))
            end

            term.setCursorPos(3, i * 4 + 4)
            if i == sel then
                term.setBackgroundColor(bghigh)
                term.write(" > ")
            else term.write(" - ") end
            term.write(v .. " ")
        end
    end

    local function updateDisplayList(items, loc, len)
        local ret = {}
        for i = 1, len do
            local item = items[i + loc - 1]
            if item then table.insert(ret, item) end
        end
        return ret
    end

    -- Variables
    local sel = 1
    local loc = 1
    local len = 3
    local disList = updateDisplayList(list, loc, len)
    draw(disList, sel, loc)

    -- Loop
    while true do
        local e, key, x, y = os.pullEvent()

        if e == "mouse_click" then
            for i, v in ipairs(disList) do
                if x >= 3 and x <= w - 11 and y >= i * 4 + 3 and y <= i * 4 + 5 then return v end
            end
        elseif e == "key" and key == 200 then
            if sel > 1 then
                sel = sel - 1
                draw(disList, sel, loc)
            elseif loc > 1 then
                loc = loc - 1
                disList = updateDisplayList(list, loc, len)
                draw(disList, sel, loc)
            end
        elseif e == "key" and key == 208 then
            if sel < len then
                sel = sel + 1
                draw(disList, sel, loc)
            elseif loc + len - 1 < #list then
                loc = loc + 1
                disList = updateDisplayList(list, loc, len)
                draw(disList, sel, loc)
            end
        elseif e == "mouse_scroll" then
            os.queueEvent("key", key == -1 and 200 or 208)
        elseif e == "key" and key == 28 then
            return disList[sel]
        end
    end
end

function monitorKeyboardShortcuts()
    local ta, tb = nil, nil
    local allowChar = false
    local shiftPressed = false
    while true do
        local event, char = os.pullEvent()
        if event == "key" and (char == 42 or char == 52) then
            shiftPressed = true
            tb = os.startTimer(keyboardShortcutTimeout)
        elseif event == "key" and (char == 29 or char == 157 or char == 219 or char == 220) then
            allowEditorEvent = false
            allowChar = true
            ta = os.startTimer(keyboardShortcutTimeout)
        elseif event == "key" and allowChar then
            local name = nil
            for k, v in pairs(keys) do
                if v == char then
                    if shiftPressed then os.queueEvent("shortcut", "ctrl shift", k:lower())
                    else os.queueEvent("shortcut", "ctrl", k:lower()) end
                    sleep(0.005)
                    allowEditorEvent = true
                end
            end
            if shiftPressed then os.queueEvent("shortcut", "ctrl shift", char)
            else os.queueEvent("shortcut", "ctrl", char) end
        elseif event == "timer" and char == ta then
            allowEditorEvent = true
            allowChar = false
        elseif event == "timer" and char == tb then
            shiftPressed = false
        end
    end
end


--  -------- Saving and Loading

local function download(url, path)
    for i = 1, 3 do
        local response = http.get(url)
        if response then
            local data = response.readAll()
            response.close()
            if path then
                local f = io.open(path, "w")
                f:write(data)
                f:close()
            end
            return true
        end
    end

    return false
end

local function saveFile(path, lines)
    local dir = path:sub(1, path:len() - fs.getName(path):len())
    if not fs.exists(dir) then fs.makeDir(dir) end
    if not fs.isDir(path) and not fs.isReadOnly(path) then
        local a = ""
        for _, v in pairs(lines) do a = a .. v .. "\n" end

        local f = io.open(path, "w")
        f:write(a)
        f:close()
        return true
    else return false end
end

local function loadFile(path)
    if not fs.exists(path) then
        local dir = path:sub(1, path:len() - fs.getName(path):len())
        if not fs.exists(dir) then fs.makeDir(dir) end
        local f = io.open(path, "w")
        f:write("")
        f:close()
    end

    local l = {}
    if fs.exists(path) and not fs.isDir(path) then
        local f = io.open(path, "r")
        if f then
            local a = f:read("*l")
            while a do
                table.insert(l, a)
                a = f:read("*l")
            end
            f:close()
        end
    else return nil end

    if #l < 1 then table.insert(l, "") end
    return l
end


--  -------- Languages

languages.lua = {}
languages.brainfuck = {}
languages.none = {}

--  Lua

languages.lua.helpTips = {
    "A function you tried to call doesn't exist.",
    "You made a typo.",
    "The index of an array is nil.",
    "The wrong variable type was passed.",
    "A function/variable doesn't exist.",
    "You missed an 'end'.",
    "You missed a 'then'.",
    "You declared a variable incorrectly.",
    "One of your variables is mysteriously nil."
}

languages.lua.defaultHelpTips = {
    2, 5
}

languages.lua.errors = {
    ["Attempt to call nil."] = {1, 2},
    ["Attempt to index nil."] = {3, 2},
    [".+ expected, got .+"] = {4, 2, 9},
    ["'end' expected"] = {6, 2},
    ["'then' expected"] = {7, 2},
    ["'=' expected"] = {8, 2}
}

languages.lua.keywords = {
    ["and"] = "conditional",
    ["break"] = "conditional",
    ["do"] = "conditional",
    ["else"] = "conditional",
    ["elseif"] = "conditional",
    ["end"] = "conditional",
    ["for"] = "conditional",
    ["function"] = "conditional",
    ["if"] = "conditional",
    ["in"] = "conditional",
    ["local"] = "conditional",
    ["not"] = "conditional",
    ["or"] = "conditional",
    ["repeat"] = "conditional",
    ["return"] = "conditional",
    ["then"] = "conditional",
    ["until"] = "conditional",
    ["while"] = "conditional",

    ["true"] = "constant",
    ["false"] = "constant",
    ["nil"] = "constant",

    ["print"] = "function",
    ["write"] = "function",
    ["sleep"] = "function",
    ["pairs"] = "function",
    ["ipairs"] = "function",
    ["loadstring"] = "function",
    ["loadfile"] = "function",
    ["dofile"] = "function",
    ["rawset"] = "function",
    ["rawget"] = "function",
    ["setfenv"] = "function",
    ["getfenv"] = "function",
}

languages.lua.parseError = function(e)
    local ret = {filename = "unknown", line = -1, display = "Unknown!", err = ""}
    if e and e ~= "" then
        ret.err = e
        if e:find(":") then
            ret.filename = e:sub(1, e:find(":") - 1):gsub("^%s*(.-)%s*$", "%1")
            -- The "" is needed to circumvent a CC bug
            e = (e:sub(e:find(":") + 1) .. ""):gsub("^%s*(.-)%s*$", "%1")
            if e:find(":") then
                ret.line = e:sub(1, e:find(":") - 1)
                e = e:sub(e:find(":") + 2):gsub("^%s*(.-)%s*$", "%1") .. ""
            end
        end
        ret.display = e:sub(1, 1):upper() .. e:sub(2, -1) .. "."
    end

    return ret
end

languages.lua.getCompilerErrors = function(code)
    code = "local function ee65da6af1cb6f63fee9a081246f2fd92b36ef2(...)\n\n" .. code .. "\n\nend"
    local fn, err = loadstring(code)
    if not err then
        local _, e = pcall(fn)
        if e then err = e end
    end

    if err then
        local a = err:find("]", 1, true)
        if a then err = "string" .. err:sub(a + 1, -1) end
        local ret = languages.lua.parseError(err)
        if tonumber(ret.line) then ret.line = tonumber(ret.line) end
        return ret
    else return languages.lua.parseError(nil) end
end

languages.lua.run = function(path, ar)
    local fn, err = loadfile(path)
    setfenv(fn, getfenv())
    if not err then
        _, err = pcall(function() fn(unpack(ar)) end)
    end
    return err
end


--  Brainfuck

languages.brainfuck.helpTips = {
    "Well idk...",
    "Isn't this the whole point of the language?",
    "Ya know... Not being able to debug it?",
    "You made a typo."
}

languages.brainfuck.defaultHelpTips = {
    1, 2, 3
}

languages.brainfuck.errors = {
    ["No matching '['"] = {1, 2, 3, 4}
}

languages.brainfuck.keywords = {}

languages.brainfuck.parseError = function(e)
    local ret = {filename = "unknown", line = -1, display = "Unknown!", err = ""}
    if e and e ~= "" then
        ret.err = e
        ret.line = e:sub(1, e:find(":") - 1)
        e = e:sub(e:find(":") + 2):gsub("^%s*(.-)%s*$", "%1") .. ""
        ret.display = e:sub(1, 1):upper() .. e:sub(2, -1) .. "."
    end

    return ret
end

languages.brainfuck.mapLoops = function(code)
    -- Map loops
    local loopLocations = {}
    local loc = 1
    local line = 1
    for let in string.gmatch(code, ".") do
        if let == "[" then
            loopLocations[loc] = true
        elseif let == "]" then
            local found = false
            for i = loc, 1, -1 do
                if loopLocations[i] == true then
                    loopLocations[i] = loc
                    found = true
                end
            end

            if not found then
                return line .. ": No matching '['"
            end
        end

        if let == "\n" then line = line + 1 end
        loc = loc + 1
    end
    return loopLocations
end

languages.brainfuck.getCompilerErrors = function(code)
    local a = languages.brainfuck.mapLoops(code)
    if type(a) == "string" then return languages.brainfuck.parseError(a)
    else return languages.brainfuck.parseError(nil) end
end

languages.brainfuck.run = function(path)
    -- Read from file
    local f = io.open(path, "r")
    local content = f:read("*a")
    f:close()

    -- Define environment
    local dataCells = {}
    local dataPointer = 1
    local instructionPointer = 1

    -- Map loops
    local loopLocations = languages.brainfuck.mapLoops(content)
    if type(loopLocations) == "string" then return loopLocations end

    -- Execute code
    while true do
        local let = content:sub(instructionPointer, instructionPointer)

        if let == ">" then
            dataPointer = dataPointer + 1
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
        elseif let == "<" then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            dataPointer = dataPointer - 1
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
        elseif let == "+" then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            dataCells[tostring(dataPointer)] = dataCells[tostring(dataPointer)] + 1
        elseif let == "-" then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            dataCells[tostring(dataPointer)] = dataCells[tostring(dataPointer)] - 1
        elseif let == "." then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            if term.getCursorPos() >= w then print("") end
            write(string.char(math.max(1, dataCells[tostring(dataPointer)])))
        elseif let == "," then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            term.setCursorBlink(true)
            local e, but = os.pullEvent("char")
            term.setCursorBlink(false)
            dataCells[tostring(dataPointer)] = string.byte(but)
            if term.getCursorPos() >= w then print("") end
            write(but)
        elseif let == "/" then
            if not dataCells[tostring(dataPointer)] then dataCells[tostring(dataPointer)] = 0 end
            if term.getCursorPos() >= w then print("") end
            write(dataCells[tostring(dataPointer)])
        elseif let == "[" then
            if dataCells[tostring(dataPointer)] == 0 then
                for k, v in pairs(loopLocations) do
                    if k == instructionPointer then instructionPointer = v end
                end
            end
        elseif let == "]" then
            for k, v in pairs(loopLocations) do
                if v == instructionPointer then instructionPointer = k - 1 end
            end
        end

        instructionPointer = instructionPointer + 1
        if instructionPointer > content:len() then print("") break end
    end
end

--  None

languages.none.helpTips = {}
languages.none.defaultHelpTips = {}
languages.none.errors = {}
languages.none.keywords = {}

languages.none.parseError = function(err)
    return {filename = "", line = -1, display = "", err = ""}
end

languages.none.getCompilerErrors = function(code)
    return languages.none.parseError(nil)
end

languages.none.run = function(path) end


-- Load language
curLanguage = languages.lua


--  -------- Run GUI

local function viewErrorHelp(e)
    title("LuaIDE - Error Help")

    local tips = nil
    for k, v in pairs(curLanguage.errors) do
        if e.display:find(k) then tips = v break end
    end

    term.setBackgroundColor(colors[theme.err])
    for i = 6, 8 do
        term.setCursorPos(5, i)
        term.write(string.rep(" ", 35))
    end

    term.setBackgroundColor(colors[theme.prompt])
    for i = 10, 18 do
        term.setCursorPos(5, i)
        term.write(string.rep(" ", 46))
    end

    if tips then
        term.setBackgroundColor(colors[theme.err])
        term.setCursorPos(6, 7)
        term.write("Error Help")

        term.setBackgroundColor(colors[theme.prompt])
        for i, v in ipairs(tips) do
            term.setCursorPos(7, i + 10)
            term.write("- " .. curLanguage.helpTips[v])
        end
    else
        term.setBackgroundColor(colors[theme.err])
        term.setCursorPos(6, 7)
        term.write("No Error Tips Available!")

        term.setBackgroundColor(colors[theme.prompt])
        term.setCursorPos(6, 11)
        term.write("There are no error tips available, but")
        term.setCursorPos(6, 12)
        term.write("you could see if it was any of these:")

        for i, v in ipairs(curLanguage.defaultHelpTips) do
            term.setCursorPos(7, i + 12)
            term.write("- " .. curLanguage.helpTips[v])
        end
    end

    prompt({{"Back", w - 8, 7}}, "horizontal")
end

local function run(path, lines, useArgs)
    local ar = {}
    if useArgs then
        title("LuaIDE - Run " .. fs.getName(path))
        local s = centerRead(w - 13, fs.getName(path) .. " ")
        for m in string.gmatch(s, "[^ \t]+") do ar[#ar + 1] = m:gsub("^%s*(.-)%s*$", "%1") end
    end

    saveFile(path, lines)
    term.setCursorBlink(false)
    term.setBackgroundColor(colors.black)
    term.setTextColor(colors.white)
    term.clear()
    term.setCursorPos(1, 1)
    local err = curLanguage.run(path, ar)

    term.setBackgroundColor(colors.black)
    print("\n")
    if err then
        if isAdvanced() then term.setTextColor(colors.red) end
        centerPrint("The program has crashed!")
    end
    term.setTextColor(colors.white)
    centerPrint("Press any key to return to LuaIDE...")
    while true do
        local e = os.pullEvent()
        if e == "key" then break end
    end

    -- To prevent key from showing up in editor
    os.queueEvent(event_distract)
    os.pullEvent()

    if err then
        if curLanguage == languages.lua and err:find("]") then
            err = fs.getName(path) .. err:sub(err:find("]", 1, true) + 1, -1)
        end

        while true do
            title("LuaIDE - Error!")

            term.setBackgroundColor(colors[theme.err])
            for i = 6, 8 do
                term.setCursorPos(3, i)
                term.write(string.rep(" ", w - 5))
            end
            term.setCursorPos(4, 7)
            term.write("The program has crashed!")

            term.setBackgroundColor(colors[theme.prompt])
            for i = 10, 14 do
                term.setCursorPos(3, i)
                term.write(string.rep(" ", w - 5))
            end

            local formattedErr = curLanguage.parseError(err)
            term.setCursorPos(4, 11)
            term.write("Line: " .. formattedErr.line)
            term.setCursorPos(4, 12)
            term.write("Error:")
            term.setCursorPos(5, 13)

            local a = formattedErr.display
            local b = nil
            if a:len() > w - 8 then
                for i = a:len(), 1, -1 do
                    if a:sub(i, i) == " " then
                        b = a:sub(i + 1, -1)
                        a = a:sub(1, i)
                        break
                    end
                end
            end

            term.write(a)
            if b then
                term.setCursorPos(5, 14)
                term.write(b)
            end

            local opt = prompt({{"Error Help", w/2 - 15, 17}, {"Go To Line", w/2 + 2, 17}},
                "horizontal")
            if opt == "Error Help" then
                viewErrorHelp(formattedErr)
            elseif opt == "Go To Line" then
                -- To prevent key from showing up in editor
                os.queueEvent(event_distract)
                os.pullEvent()

                return "go to", tonumber(formattedErr.line)
            end
        end
    end
end


--  -------- Functions

local function goto()
    term.setBackgroundColor(colors[theme.backgroundHighlight])
    term.setCursorPos(2, 1)
    term.clearLine()
    term.write("Line: ")
    local line = modRead({visibleLength = w - 2})

    local num = tonumber(line)
    if num and num > 0 then return num
    else
        term.setCursorPos(2, 1)
        term.clearLine()
        term.write("Not a line number!")
        sleep(1.6)
        return nil
    end
end

local function setsyntax()
    local opts = {
        "[Lua]   Brainfuck    None ",
        " Lua   [Brainfuck]   None ",
        " Lua    Brainfuck   [None]"
    }
    local sel = 1

    term.setCursorBlink(false)
    term.setBackgroundColor(colors[theme.backgroundHighlight])
    term.setCursorPos(2, 1)
    term.clearLine()
    term.write(opts[sel])
    while true do
        local e, but, x, y = os.pullEvent("key")
        if but == 203 then
            sel = math.max(1, sel - 1)
            term.setCursorPos(2, 1)
            term.clearLine()
            term.write(opts[sel])
        elseif but == 205 then
            sel = math.min(#opts, sel + 1)
            term.setCursorPos(2, 1)
            term.clearLine()
            term.write(opts[sel])
        elseif but == 28 then
            if sel == 1 then curLanguage = languages.lua
            elseif sel == 2 then curLanguage = languages.brainfuck
            elseif sel == 3 then curLanguage = languages.none end
            term.setCursorBlink(true)
            return
        end
    end
end


--  -------- Re-Indenting

local tabWidth = 2

local comments = {}
local strings = {}

local increment = {
    "if%s+.+%s+then%s*$",
    "for%s+.+%s+do%s*$",
    "while%s+.+%s+do%s*$",
    "repeat%s*$",
    "function%s+[a-zA-Z_0-9]\(.*\)%s*$"
}

local decrement = {
    "end",
    "until%s+.+"
}

local special = {
    "else%s*$",
    "elseif%s+.+%s+then%s*$"
}

local function check(func)
    for _, v in pairs(func) do
        local cLineStart = v["lineStart"]
        local cLineEnd = v["lineEnd"]
        local cCharStart = v["charStart"]
        local cCharEnd = v["charEnd"]

        if line >= cLineStart and line <= cLineEnd then
            if line == cLineStart then return cCharStart < charNumb
            elseif line == cLineEnd then return cCharEnd > charNumb
            else return true end
        end
    end
end

local function isIn(line, loc)
    if check(comments) then return true end
    if check(strings) then return true end
    return false
end

local function setComment(ls, le, cs, ce)
    comments[#comments + 1] = {}
    comments[#comments].lineStart = ls
    comments[#comments].lineEnd = le
    comments[#comments].charStart = cs
    comments[#comments].charEnd = ce
end

local function setString(ls, le, cs, ce)
    strings[#strings + 1] = {}
    strings[#strings].lineStart = ls
    strings[#strings].lineEnd = le
    strings[#strings].charStart = cs
    strings[#strings].charEnd = ce
end

local function map(contents)
    local inCom = false
    local inStr = false

    for i = 1, #contents do
        if content[i]:find("%-%-%[%[") and not inStr and not inCom then
            local cStart = content[i]:find("%-%-%[%[")
            setComment(i, nil, cStart, nil)
            inCom = true
        elseif content[i]:find("%-%-%[=%[") and not inStr and not inCom then
            local cStart = content[i]:find("%-%-%[=%[")
            setComment(i, nil, cStart, nil)
            inCom = true
        elseif content[i]:find("%[%[") and not inStr and not inCom then
            local cStart = content[i]:find("%[%[")
            setString(i, nil, cStart, nil)
            inStr = true
        elseif content[i]:find("%[=%[") and not inStr and not inCom then
            local cStart = content[i]:find("%[=%[")
            setString(i, nil, cStart, nil)
            inStr = true
        end

        if content[i]:find("%]%]") and inStr and not inCom then
            local cStart, cEnd = content[i]:find("%]%]")
            strings[#strings].lineEnd = i
            strings[#strings].charEnd = cEnd
            inStr = false
        elseif content[i]:find("%]=%]") and inStr and not inCom then
            local cStart, cEnd = content[i]:find("%]=%]")
            strings[#strings].lineEnd = i
            strings[#strings].charEnd = cEnd
            inStr = false
        end

        if content[i]:find("%]%]") and not inStr and inCom then
            local cStart, cEnd = content[i]:find("%]%]")
            comments[#comments].lineEnd = i
            comments[#comments].charEnd = cEnd
            inCom = false
        elseif content[i]:find("%]=%]") and not inStr and inCom then
            local cStart, cEnd = content[i]:find("%]=%]")
            comments[#comments].lineEnd = i
            comments[#comments].charEnd = cEnd
            inCom = false
        end

        if content[i]:find("%-%-") and not inStr and not inCom then
            local cStart = content[i]:find("%-%-")
            setComment(i, i, cStart, -1)
        elseif content[i]:find("'") and not inStr and not inCom then
            local cStart, cEnd = content[i]:find("'")
            local nextChar = content[i]:sub(cEnd + 1, string.len(content[i]))
            local _, cEnd = nextChar:find("'")
            setString(i, i, cStart, cEnd)
        elseif content[i]:find('"') and not inStr and not inCom then
            local cStart, cEnd = content[i]:find('"')
            local nextChar = content[i]:sub(cEnd + 1, string.len(content[i]))
            local _, cEnd = nextChar:find('"')
            setString(i, i, cStart, cEnd)
        end
    end
end

local function reindent(contents)
    local err = nil
    if curLanguage ~= languages.lua then
        err = "Cannot indent languages other than Lua!"
    elseif curLanguage.getCompilerErrors(table.concat(contents, "\n")).line ~= -1 then
        err = "Cannot indent a program with errors!"
    end

    if err then
        term.setCursorBlink(false)
        term.setCursorPos(2, 1)
        term.setBackgroundColor(colors[theme.backgroundHighlight])
        term.clearLine()
        term.write(err)
        sleep(1.6)
        return contents
    end

    local new = {}
    local level = 0
    for k, v in pairs(contents) do
        local incrLevel = false
        local foundIncr = false
        for _, incr in pairs(increment) do
            if v:find(incr) and not isIn(k, v:find(incr)) then
                incrLevel = true
            end
            if v:find(incr:sub(1, -2)) and not isIn(k, v:find(incr)) then
                foundIncr = true
            end
        end

        local decrLevel = false
        if not incrLevel then
            for _, decr in pairs(decrement) do
                if v:find(decr) and not isIn(k, v:find(decr)) and not foundIncr then
                    level = math.max(0, level - 1)
                    decrLevel = true
                end
            end
        end

        if not decrLevel then
            for _, sp in pairs(special) do
                if v:find(sp) and not isIn(k, v:find(sp)) then
                    incrLevel = true
                    level = math.max(0, level - 1)
                end
            end
        end

        new[k] = string.rep(" ", level * tabWidth) .. v
        if incrLevel then level = level + 1 end
    end

    return new
end


--  -------- Menu

local menu = {
    [1] = {"File",
--      "About",
--      "Settings",
--      "",
        "New File  ^+N",
        "Open File ^+O",
        "Save File ^+S",
        "Close     ^+W",
        "Print     ^+P",
        "Quit      ^+Q"
    }, [2] = {"Edit",
        "Cut Line   ^+X",
        "Copy Line  ^+C",
        "Paste Line ^+V",
        "Delete Line",
        "Clear Line"
    }, [3] = {"Functions",
        "Go To Line    ^+G",
        "Re-Indent     ^+I",
        "Set Syntax    ^+E",
        "Start of Line ^+<",
        "End of Line   ^+>"
    }, [4] = {"Run",
        "Run Program       ^+R",
        "Run w/ Args ^+Shift+R"
    }
}

local shortcuts = {
    -- File
    ["ctrl n"] = "New File  ^+N",
    ["ctrl o"] = "Open File ^+O",
    ["ctrl s"] = "Save File ^+S",
    ["ctrl w"] = "Close     ^+W",
    ["ctrl p"] = "Print     ^+P",
    ["ctrl q"] = "Quit      ^+Q",

    -- Edit
    ["ctrl x"] = "Cut Line   ^+X",
    ["ctrl c"] = "Copy Line  ^+C",
    ["ctrl v"] = "Paste Line ^+V",

    -- Functions
    ["ctrl g"] = "Go To Line    ^+G",
    ["ctrl i"] = "Re-Indent     ^+I",
    ["ctrl e"] = "Set Syntax    ^+E",
    ["ctrl 203"] = "Start of Line ^+<",
    ["ctrl 205"] = "End of Line   ^+>",

    -- Run
    ["ctrl r"] = "Run Program       ^+R",
    ["ctrl shift r"] = "Run w/ Args ^+Shift+R"
}

local menuFunctions = {
    -- File
--  ["About"] = function() end,
--  ["Settings"] = function() end,
    ["New File  ^+N"] = function(path, lines) saveFile(path, lines) return "new" end,
    ["Open File ^+O"] = function(path, lines) saveFile(path, lines) return "open" end,
    ["Save File ^+S"] = function(path, lines) saveFile(path, lines) end,
    ["Close     ^+W"] = function(path, lines) saveFile(path, lines) return "menu" end,
    ["Print     ^+P"] = function(path, lines) saveFile(path, lines) return nil end,
    ["Quit      ^+Q"] = function(path, lines) saveFile(path, lines) return "exit" end,

    -- Edit
    ["Cut Line   ^+X"] = function(path, lines, y)
        clipboard = lines[y] table.remove(lines, y) return nil, lines end,
    ["Copy Line  ^+C"] = function(path, lines, y) clipboard = lines[y] end,
    ["Paste Line ^+V"] = function(path, lines, y)
        if clipboard then table.insert(lines, y, clipboard) end return nil, lines end,
    ["Delete Line"] = function(path, lines, y) table.remove(lines, y) return nil, lines end,
    ["Clear Line"] = function(path, lines, y) lines[y] = "" return nil, lines, "cursor" end,

    -- Functions
    ["Go To Line    ^+G"] = function() return nil, "go to", goto() end,
    ["Re-Indent     ^+I"] = function(path, lines)
        local a = reindent(lines) saveFile(path, lines) return nil, a
    end,
    ["Set Syntax    ^+E"] = function(path, lines)
        setsyntax()
        if curLanguage == languages.brainfuck and lines[1] ~= "-- Syntax: Brainfuck" then
            table.insert(lines, 1, "-- Syntax: Brainfuck")
            return nil, lines
        end
    end,
    ["Start of Line ^+<"] = function() os.queueEvent("key", 199) end,
    ["End of Line   ^+>"] = function() os.queueEvent("key", 207) end,

    -- Run
    ["Run Program       ^+R"] = function(path, lines)
        saveFile(path, lines)
        return nil, run(path, lines, false)
    end,
    ["Run w/ Args ^+Shift+R"] = function(path, lines)
        saveFile(path, lines)
        return nil, run(path, lines, true)
    end,
}

local function drawMenu(open)
    term.setCursorPos(1, 1)
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.backgroundHighlight])
    term.clearLine()
    local curX = 0
    for _, v in pairs(menu) do
        term.setCursorPos(3 + curX, 1)
        term.write(v[1])
        curX = curX + v[1]:len() + 3
    end

    if open then
        local it = {}
        local x = 1
        for _, v in pairs(menu) do
            if open == v[1] then
                it = v
                break
            end
            x = x + v[1]:len() + 3
        end
        x = x + 1

        local items = {}
        for i = 2, #it do
            table.insert(items, it[i])
        end

        local len = 1
        for _, v in pairs(items) do if v:len() + 2 > len then len = v:len() + 2 end end

        for i, v in ipairs(items) do
            term.setCursorPos(x, i + 1)
            term.write(string.rep(" ", len))
            term.setCursorPos(x + 1, i + 1)
            term.write(v)
        end
        term.setCursorPos(x, #items + 2)
        term.write(string.rep(" ", len))
        return items, len
    end
end

local function triggerMenu(cx, cy)
    -- Determine clicked menu
    local curX = 0
    local open = nil
    for _, v in pairs(menu) do
        if cx >= curX + 3 and cx <= curX + v[1]:len() + 2 then
            open = v[1]
            break
        end
        curX = curX + v[1]:len() + 3
    end
    local menux = curX + 2
    if not open then return false end

    -- Flash menu item
    term.setCursorBlink(false)
    term.setCursorPos(menux, 1)
    term.setBackgroundColor(colors[theme.background])
    term.write(string.rep(" ", open:len() + 2))
    term.setCursorPos(menux + 1, 1)
    term.write(open)
    sleep(0.1)
    local items, len = drawMenu(open)

    local ret = true

    -- Pull events on menu
    local ox, oy = term.getCursorPos()
    while type(ret) ~= "string" do
        local e, but, x, y = os.pullEvent()
        if e == "mouse_click" then
            -- If clicked outside menu
            if x < menux - 1 or x > menux + len - 1 then break
            elseif y > #items + 2 then break
            elseif y == 1 then break end

            for i, v in ipairs(items) do
                if y == i + 1 and x >= menux and x <= menux + len - 2 then
                    -- Flash when clicked
                    term.setCursorPos(menux, y)
                    term.setBackgroundColor(colors[theme.background])
                    term.write(string.rep(" ", len))
                    term.setCursorPos(menux + 1, y)
                    term.write(v)
                    sleep(0.1)
                    drawMenu(open)

                    -- Return item
                    ret = v
                    break
                end
            end
        end
    end

    term.setCursorPos(ox, oy)
    term.setCursorBlink(true)
    return ret
end


--  -------- Editing

local standardsCompletions = {
    "if%s+.+%s+then%s*$",
    "for%s+.+%s+do%s*$",
    "while%s+.+%s+do%s*$",
    "repeat%s*$",
    "function%s+[a-zA-Z_0-9]?\(.*\)%s*$",
    "=%s*function%s*\(.*\)%s*$",
    "else%s*$",
    "elseif%s+.+%s+then%s*$"
}

local liveCompletions = {
    ["("] = ")",
    ["{"] = "}",
    ["["] = "]",
    ["\""] = "\"",
    ["'"] = "'",
}

local x, y = 0, 0
local edw, edh = 0, h - 1
local offx, offy = 0, 1
local scrollx, scrolly = 0, 0
local lines = {}
local liveErr = curLanguage.parseError(nil)
local displayCode = true
local lastEventClock = os.clock()

local function attemptToHighlight(line, regex, col)
    local match = string.match(line, regex)
    if match then
        if type(col) == "number" then term.setTextColor(col)
        elseif type(col) == "function" then term.setTextColor(col(match)) end
        term.write(match)
        term.setTextColor(colors[theme.textColor])
        return line:sub(match:len() + 1, -1)
    end
    return nil
end

local function writeHighlighted(line)
    if curLanguage == languages.lua then
        while line:len() > 0 do
            line = attemptToHighlight(line, "^%-%-%[%[.-%]%]", colors[theme.comment]) or
                attemptToHighlight(line, "^%-%-.*", colors[theme.comment]) or
                attemptToHighlight(line, "^\".*[^\\]\"", colors[theme.string]) or
                attemptToHighlight(line, "^\'.*[^\\]\'", colors[theme.string]) or
                attemptToHighlight(line, "^%[%[.-%]%]", colors[theme.string]) or
                attemptToHighlight(line, "^[%w_]+", function(match)
                    if curLanguage.keywords[match] then
                        return colors[theme[curLanguage.keywords[match]]]
                    end
                    return colors[theme.textColor]
                end) or
                attemptToHighlight(line, "^[^%w_]", colors[theme.textColor])
        end
    else term.write(line) end
end

local function draw()
    -- Menu
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.editorBackground])
    term.clear()
    drawMenu()

    -- Line numbers
    offx, offy = tostring(#lines):len() + 1, 1
    edw, edh = w - offx, h - 1

    -- Draw text
    for i = 1, edh do
        local a = lines[scrolly + i]
        if a then
            local ln = string.rep(" ", offx - 1 - tostring(scrolly + i):len()) .. tostring(scrolly + i)
            local l = a:sub(scrollx + 1, edw + scrollx + 1)
            ln = ln .. ":"

            if liveErr.line == scrolly + i then ln = string.rep(" ", offx - 2) .. "!:" end

            term.setCursorPos(1, i + offy)
            term.setBackgroundColor(colors[theme.editorBackground])
            if scrolly + i == y then
                if scrolly + i == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorErrorHighlight])
                else term.setBackgroundColor(colors[theme.editorLineHightlight]) end
                term.clearLine()
            elseif scrolly + i == liveErr.line then
                term.setBackgroundColor(colors[theme.editorError])
                term.clearLine()
            end

            term.setCursorPos(1 - scrollx + offx, i + offy)
            if scrolly + i == y then
                if scrolly + i == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorErrorHighlight])
                else term.setBackgroundColor(colors[theme.editorLineHightlight]) end
            elseif scrolly + i == liveErr.line then term.setBackgroundColor(colors[theme.editorError])
            else term.setBackgroundColor(colors[theme.editorBackground]) end
            if scrolly + i == liveErr.line then
                if displayCode then term.write(a)
                else term.write(liveErr.display) end
            else writeHighlighted(a) end

            term.setCursorPos(1, i + offy)
            if scrolly + i == y then
                if scrolly + i == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorError])
                else term.setBackgroundColor(colors[theme.editorLineNumbersHighlight]) end
            elseif scrolly + i == liveErr.line then
                term.setBackgroundColor(colors[theme.editorErrorHighlight])
            else term.setBackgroundColor(colors[theme.editorLineNumbers]) end
            term.write(ln)
        end
    end
    term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
end

local function drawLine(...)
    local ls = {...}
    offx = tostring(#lines):len() + 1
    for _, ly in pairs(ls) do
        local a = lines[ly]
        if a then
            local ln = string.rep(" ", offx - 1 - tostring(ly):len()) .. tostring(ly)
            local l = a:sub(scrollx + 1, edw + scrollx + 1)
            ln = ln .. ":"

            if liveErr.line == ly then ln = string.rep(" ", offx - 2) .. "!:" end

            term.setCursorPos(1, (ly - scrolly) + offy)
            term.setBackgroundColor(colors[theme.editorBackground])
            if ly == y then
                if ly == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorErrorHighlight])
                else term.setBackgroundColor(colors[theme.editorLineHightlight]) end
            elseif ly == liveErr.line then
                term.setBackgroundColor(colors[theme.editorError])
            end
            term.clearLine()

            term.setCursorPos(1 - scrollx + offx, (ly - scrolly) + offy)
            if ly == y then
                if ly == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorErrorHighlight])
                else term.setBackgroundColor(colors[theme.editorLineHightlight]) end
            elseif ly == liveErr.line then term.setBackgroundColor(colors[theme.editorError])
            else term.setBackgroundColor(colors[theme.editorBackground]) end
            if ly == liveErr.line then
                if displayCode then term.write(a)
                else term.write(liveErr.display) end
            else writeHighlighted(a) end

            term.setCursorPos(1, (ly - scrolly) + offy)
            if ly == y then
                if ly == liveErr.line and os.clock() - lastEventClock > 3 then
                    term.setBackgroundColor(colors[theme.editorError])
                else term.setBackgroundColor(colors[theme.editorLineNumbersHighlight]) end
            elseif ly == liveErr.line then
                term.setBackgroundColor(colors[theme.editorErrorHighlight])
            else term.setBackgroundColor(colors[theme.editorLineNumbers]) end
            term.write(ln)
        end
    end
    term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
end

local function cursorLoc(x, y, force)
    local sx, sy = x - scrollx, y - scrolly
    local redraw = false
    if sx < 1 then
        scrollx = x - 1
        sx = 1
        redraw = true
    elseif sx > edw then
        scrollx = x - edw
        sx = edw
        redraw = true
    end if sy < 1 then
        scrolly = y - 1
        sy = 1
        redraw = true
    elseif sy > edh then
        scrolly = y - edh
        sy = edh
        redraw = true
    end if redraw or force then draw() end
    term.setCursorPos(sx + offx, sy + offy)
end

local function executeMenuItem(a, path)
    if type(a) == "string" and menuFunctions[a] then
        local opt, nl, gtln = menuFunctions[a](path, lines, y)
        if type(opt) == "string" then term.setCursorBlink(false) return opt end
        if type(nl) == "table" then
            if #lines < 1 then table.insert(lines, "") end
            y = math.min(y, #lines)
            x = math.min(x, lines[y]:len() + 1)
            lines = nl
        elseif type(nl) == "string" then
            if nl == "go to" and gtln then
                x, y = 1, math.min(#lines, gtln)
                cursorLoc(x, y)
            end
        end
    end
    term.setCursorBlink(true)
    draw()
    term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
end

local function edit(path)
    -- Variables
    x, y = 1, 1
    offx, offy = 0, 1
    scrollx, scrolly = 0, 0
    lines = loadFile(path)
    if not lines then return "menu" end

    -- Enable brainfuck
    if lines[1] == "-- Syntax: Brainfuck" then
        curLanguage = languages.brainfuck
    end

    -- Clocks
    local autosaveClock = os.clock()
    local scrollClock = os.clock() -- To prevent redraw flicker
    local liveErrorClock = os.clock()
    local hasScrolled = false

    -- Draw
    draw()
    term.setCursorPos(x + offx, y + offy)
    term.setCursorBlink(true)

    -- Main loop
    local tid = os.startTimer(3)
    while true do
        local e, key, cx, cy = os.pullEvent()
        if e == "key" and allowEditorEvent then
            if key == 200 and y > 1 then
                -- Up
                x, y = math.min(x, lines[y - 1]:len() + 1), y - 1
                drawLine(y, y + 1)
                cursorLoc(x, y)
            elseif key == 208 and y < #lines then
                -- Down
                x, y = math.min(x, lines[y + 1]:len() + 1), y + 1
                drawLine(y, y - 1)
                cursorLoc(x, y)
            elseif key == 203 and x > 1 then
                -- Left
                x = x - 1
                local force = false
                if y - scrolly + offy < offy + 1 then force = true end
                cursorLoc(x, y, force)
            elseif key == 205 and x < lines[y]:len() + 1 then
                -- Right
                x = x + 1
                local force = false
                if y - scrolly + offy < offy + 1 then force = true end
                cursorLoc(x, y, force)
            elseif (key == 28 or key == 156) and (displayCode and true or y + scrolly - 1 ==
                    liveErr.line) then
                -- Enter
                local f = nil
                for _, v in pairs(standardsCompletions) do
                    if lines[y]:find(v) then f = v end
                end

                local _, spaces = lines[y]:find("^[ ]+")
                if not spaces then spaces = 0 end
                if f then
                    table.insert(lines, y + 1, string.rep(" ", spaces + 2))
                    if not f:find("else", 1, true) and not f:find("elseif", 1, true) then
                        table.insert(lines, y + 2, string.rep(" ", spaces) ..
                            (f:find("repeat", 1, true) and "until " or f:find("{", 1, true) and "}" or
                            "end"))
                    end
                    x, y = spaces + 3, y + 1
                    cursorLoc(x, y, true)
                else
                    local oldLine = lines[y]

                    lines[y] = lines[y]:sub(1, x - 1)
                    table.insert(lines, y + 1, string.rep(" ", spaces) .. oldLine:sub(x, -1))

                    x, y = spaces + 1, y + 1
                    cursorLoc(x, y, true)
                end
            elseif key == 14 and (displayCode and true or y + scrolly - 1 == liveErr.line) then
                -- Backspace
                if x > 1 then
                    local f = false
                    for k, v in pairs(liveCompletions) do
                        if lines[y]:sub(x - 1, x - 1) == k then f = true end
                    end

                    lines[y] = lines[y]:sub(1, x - 2) .. lines[y]:sub(x + (f and 1 or 0), -1)
                    drawLine(y)
                    x = x - 1
                    cursorLoc(x, y)
                elseif y > 1 then
                    local prevLen = lines[y - 1]:len() + 1
                    lines[y - 1] = lines[y - 1] .. lines[y]
                    table.remove(lines, y)
                    x, y = prevLen, y - 1
                    cursorLoc(x, y, true)
                end
            elseif key == 199 then
                -- Home
                x = 1
                local force = false
                if y - scrolly + offy < offy + 1 then force = true end
                cursorLoc(x, y, force)
            elseif key == 207 then
                -- End
                x = lines[y]:len() + 1
                local force = false
                if y - scrolly + offy < offy + 1 then force = true end
                cursorLoc(x, y, force)
            elseif key == 211 and (displayCode and true or y + scrolly - 1 == liveErr.line) then
                -- Forward Delete
                if x < lines[y]:len() + 1 then
                    lines[y] = lines[y]:sub(1, x - 1) .. lines[y]:sub(x + 1)
                    local force = false
                    if y - scrolly + offy < offy + 1 then force = true end
                    drawLine(y)
                    cursorLoc(x, y, force)
                elseif y < #lines then
                    lines[y] = lines[y] .. lines[y + 1]
                    table.remove(lines, y + 1)
                    draw()
                    cursorLoc(x, y)
                end
            elseif key == 15 and (displayCode and true or y + scrolly - 1 == liveErr.line) then
                -- Tab
                lines[y] = string.rep(" ", tabWidth) .. lines[y]
                x = x + 2
                local force = false
                if y - scrolly + offy < offy + 1 then force = true end
                drawLine(y)
                cursorLoc(x, y, force)
            elseif key == 201 then
                -- Page up
                y = math.min(math.max(y - edh, 1), #lines)
                x = math.min(lines[y]:len() + 1, x)
                cursorLoc(x, y, true)
            elseif key == 209 then
                -- Page down
                y = math.min(math.max(y + edh, 1), #lines)
                x = math.min(lines[y]:len() + 1, x)
                cursorLoc(x, y, true)
            end
        elseif e == "char" and allowEditorEvent and (displayCode and true or
                y + scrolly - 1 == liveErr.line) then
            local shouldIgnore = false
            for k, v in pairs(liveCompletions) do
                if key == v and lines[y]:find(k, 1, true) and lines[y]:sub(x, x) == v then
                    shouldIgnore = true
                end
            end

            local addOne = false
            if not shouldIgnore then
                for k, v in pairs(liveCompletions) do
                    if key == k and lines[y]:sub(x, x) ~= k then key = key .. v addOne = true end
                end
                lines[y] = lines[y]:sub(1, x - 1) .. key .. lines[y]:sub(x, -1)
            end

            x = x + (addOne and 1 or key:len())
            local force = false
            if y - scrolly + offy < offy + 1 then force = true end
            drawLine(y)
            cursorLoc(x, y, force)
        elseif e == "mouse_click" and key == 1 then
            if cy > 1 then
                if cx <= offx and cy - offy == liveErr.line - scrolly then
                    displayCode = not displayCode
                    drawLine(liveErr.line)
                else
                    local oldy = y
                    y = math.min(math.max(scrolly + cy - offy, 1), #lines)
                    x = math.min(math.max(scrollx + cx - offx, 1), lines[y]:len() + 1)
                    if oldy ~= y then drawLine(oldy, y) end
                    cursorLoc(x, y)
                end
            else
                local a = triggerMenu(cx, cy)
                if a then
                    local opt = executeMenuItem(a, path)
                    if opt then return opt end
                end
            end
        elseif e == "shortcut" then
            local a = shortcuts[key .. " " .. cx]
            if a then
                local parent = nil
                local curx = 0
                for i, mv in ipairs(menu) do
                    for _, iv in pairs(mv) do
                        if iv == a then
                            parent = menu[i][1]
                            break
                        end
                    end
                    if parent then break end
                    curx = curx + mv[1]:len() + 3
                end
                local menux = curx + 2

                -- Flash menu item
                term.setCursorBlink(false)
                term.setCursorPos(menux, 1)
                term.setBackgroundColor(colors[theme.background])
                term.write(string.rep(" ", parent:len() + 2))
                term.setCursorPos(menux + 1, 1)
                term.write(parent)
                sleep(0.1)
                drawMenu()

                -- Execute item
                local opt = executeMenuItem(a, path)
                if opt then return opt end
            end
        elseif e == "mouse_scroll" then
            if key == -1 and scrolly > 0 then
                scrolly = scrolly - 1
                if os.clock() - scrollClock > 0.0005 then
                    draw()
                    term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
                end
                scrollClock = os.clock()
                hasScrolled = true
            elseif key == 1 and scrolly < #lines - edh then
                scrolly = scrolly + 1
                if os.clock() - scrollClock > 0.0005 then
                    draw()
                    term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
                end
                scrollClock = os.clock()
                hasScrolled = true
            end
        elseif e == "timer" and key == tid then
            drawLine(y)
            tid = os.startTimer(3)
        end

        -- Draw
        if hasScrolled and os.clock() - scrollClock > 0.1 then
            draw()
            term.setCursorPos(x - scrollx + offx, y - scrolly + offy)
            hasScrolled = false
        end

        -- Autosave
        if os.clock() - autosaveClock > autosaveInterval then
            saveFile(path, lines)
            autosaveClock = os.clock()
        end

        -- Errors
        if os.clock() - liveErrorClock > 1 then
            local prevLiveErr = liveErr
            liveErr = curLanguage.parseError(nil)
            local code = ""
            for _, v in pairs(lines) do code = code .. v .. "\n" end

            liveErr = curLanguage.getCompilerErrors(code)
            liveErr.line = math.min(liveErr.line - 2, #lines)
            if liveErr ~= prevLiveErr then draw() end
            liveErrorClock = os.clock()
        end
    end

    return "menu"
end


--  -------- Open File

local function newFile()
    local wid = w - 13

    -- Get name
    title("Lua IDE - New File")
    local name = centerRead(wid, "/")
    if not name or name == "" then return "menu" end
    name = "/" .. name

    -- Clear
    title("Lua IDE - New File")
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.promptHighlight])
    for i = 8, 10 do
        term.setCursorPos(w/2 - wid/2, i)
        term.write(string.rep(" ", wid))
    end
    term.setCursorPos(1, 9)
    if fs.isDir(name) then
        centerPrint("Cannot Edit a Directory!")
        sleep(1.6)
        return "menu"
    elseif fs.exists(name) then
        centerPrint("File Already Exists!")
        local opt = prompt({{"Open", w/2 - 9, 14}, {"Cancel", w/2 + 2, 14}}, "horizontal")
        if opt == "Open" then return "edit", name
        elseif opt == "Cancel" then return "menu" end
    else return "edit", name end
end

local function openFile()
    local wid = w - 13

    -- Get name
    title("Lua IDE - Open File")
    local name = centerRead(wid, "/")
    if not name or name == "" then return "menu" end
    name = "/" .. name

    -- Clear
    title("Lua IDE - New File")
    term.setTextColor(colors[theme.textColor])
    term.setBackgroundColor(colors[theme.promptHighlight])
    for i = 8, 10 do
        term.setCursorPos(w/2 - wid/2, i)
        term.write(string.rep(" ", wid))
    end
    term.setCursorPos(1, 9)
    if fs.isDir(name) then
        centerPrint("Cannot Open a Directory!")
        sleep(1.6)
        return "menu"
    elseif not fs.exists(name) then
        centerPrint("File Doesn't Exist!")
        local opt = prompt({{"Create", w/2 - 11, 14}, {"Cancel", w/2 + 2, 14}}, "horizontal")
        if opt == "Create" then return "edit", name
        elseif opt == "Cancel" then return "menu" end
    else return "edit", name end
end


--  -------- Settings

local function update()
    local function draw(status)
        title("LuaIDE - Update")
        term.setBackgroundColor(colors[theme.prompt])
        term.setTextColor(colors[theme.textColor])
        for i = 8, 10 do
            term.setCursorPos(w/2 - (status:len() + 4), i)
            write(string.rep(" ", status:len() + 4))
        end
        term.setCursorPos(w/2 - (status:len() + 4), 9)
        term.write(" - " .. status .. " ")

        term.setBackgroundColor(colors[theme.errHighlight])
        for i = 8, 10 do
            term.setCursorPos(w/2 + 2, i)
            term.write(string.rep(" ", 10))
        end
        term.setCursorPos(w/2 + 2, 9)
        term.write(" > Cancel ")
    end

    if not http then
        draw("HTTP API Disabled!")
        sleep(1.6)
        return "settings"
    end

    draw("Updating...")
    local tID = os.startTimer(10)
    http.request(updateURL)
    while true do
        local e, but, x, y = os.pullEvent()
        if (e == "key" and but == 28) or
                (e == "mouse_click" and x >= w/2 + 2 and x <= w/2 + 12 and y == 9) then
            draw("Cancelled")
            sleep(1.6)
            break
        elseif e == "http_success" and but == updateURL then
            local new = x.readAll()
            local curf = io.open(ideLocation, "r")
            local cur = curf:read("*a")
            curf:close()

            if cur ~= new then
                draw("Update Found")
                sleep(1.6)
                local f = io.open(ideLocation, "w")
                f:write(new)
                f:close()

                draw("Click to Exit")
                while true do
                    local e = os.pullEvent()
                    if e == "mouse_click" or (not isAdvanced() and e == "key") then break end
                end
                return "exit"
            else
                draw("No Updates Found!")
                sleep(1.6)
                break
            end
        elseif e == "http_failure" or (e == "timer" and but == tID) then
            draw("Update Failed!")
            sleep(1.6)
            break
        end
    end

    return "settings"
end

local function changeTheme()
    title("LuaIDE - Theme")

    if isAdvanced() then
        local disThemes = {"Back"}
        for _, v in pairs(availableThemes) do table.insert(disThemes, v[1]) end
        local t = scrollingPrompt(disThemes)
        local url = nil
        for _, v in pairs(availableThemes) do if v[1] == t then url = v[2] end end

        if not url then return "settings" end
        if t == "Dawn (Default)" then
            term.setBackgroundColor(colors[theme.backgroundHighlight])
            term.setCursorPos(3, 3)
            term.clearLine()
            term.write("LuaIDE - Loaded Theme!")
            sleep(1.6)

            fs.delete(themeLocation)
            theme = defaultTheme
            return "menu"
        end

        term.setBackgroundColor(colors[theme.backgroundHighlight])
        term.setCursorPos(3, 3)
        term.clearLine()
        term.write("LuaIDE - Downloading...")

        fs.delete("/.LuaIDE_temp_theme_file")
        download(url, "/.LuaIDE_temp_theme_file")
        local a = loadTheme("/.LuaIDE_temp_theme_file")

        term.setCursorPos(3, 3)
        term.clearLine()
        if a then
            term.write("LuaIDE - Loaded Theme!")
            fs.delete(themeLocation)
            fs.move("/.LuaIDE_temp_theme_file", themeLocation)
            theme = a
            sleep(1.6)
            return "menu"
        end

        term.write("LuaIDE - Could Not Load Theme!")
        fs.delete("/.LuaIDE_temp_theme_file")
        sleep(1.6)
        return "settings"
    else
        term.setCursorPos(1, 8)
        centerPrint("Themes are not available on")
        centerPrint("normal computers!")
    end
end

local function settings()
    title("LuaIDE - Settings")

    local opt = prompt({{"Change Theme", w/2 - 17, 8}, {"Return to Menu", w/2 - 22, 13},
        {"Check for Updates", w/2 + 2, 8}, {"Exit IDE", w/2 + 2, 13, bg = colors[theme.err],
        highlight = colors[theme.errHighlight]}}, "vertical", true)
    if opt == "Change Theme" then return changeTheme()
    elseif opt == "Check for Updates" then return update()
    elseif opt == "Return to Menu" then return "menu"
    elseif opt == "Exit IDE" then return "exit" end
end


--  -------- Menu

local function menu()
    title("Welcome to LuaIDE " .. version)

    local opt = prompt({{"New File", w/2 - 13, 8}, {"Open File", w/2 - 14, 13},
        {"Settings", w/2 + 2, 8}, {"Exit IDE", w/2 + 2, 13, bg = colors[theme.err],
        highlight = colors[theme.errHighlight]}}, "vertical", true)
    if opt == "New File" then return "new"
    elseif opt == "Open File" then return "open"
    elseif opt == "Settings" then return "settings"
    elseif opt == "Exit IDE" then return "exit" end
end


--  -------- Main

local function main(arguments)
    local opt, data = "menu", nil

    -- Check arguments
    if type(arguments) == "table" and #arguments > 0 then
        local f = "/" .. shell.resolve(arguments[1])
        if fs.isDir(f) then print("Cannot edit a directory.") end
        opt, data = "edit", f
    end

    -- Main run loop
    while true do
        -- Menu
        if opt == "menu" then opt = menu() end

        -- Other
        if opt == "new" then opt, data = newFile()
        elseif opt == "open" then opt, data = openFile()
        elseif opt == "settings" then opt = settings()
        end if opt == "exit" then break end

        -- Edit
        if opt == "edit" and data then opt = edit(data) end
    end
end

-- Load Theme
if fs.exists(themeLocation) then theme = loadTheme(themeLocation) end
if not theme and isAdvanced() then theme = defaultTheme
elseif not theme then theme = normalTheme end

-- Run
local _, err = pcall(function()
    parallel.waitForAny(function() main(args) end, monitorKeyboardShortcuts)
end)

-- Catch errors
if err and not err:find("Terminated") then
    term.setCursorBlink(false)
    title("LuaIDE - Crash! D:")

    term.setBackgroundColor(colors[theme.err])
    for i = 6, 8 do
        term.setCursorPos(5, i)
        term.write(string.rep(" ", 36))
    end
    term.setCursorPos(6, 7)
    term.write("LuaIDE Has Crashed! D:")

    term.setBackgroundColor(colors[theme.background])
    term.setCursorPos(2, 10)
    print(err)

    term.setBackgroundColor(colors[theme.prompt])
    local _, cy = term.getCursorPos()
    for i = cy + 1, cy + 4 do
        term.setCursorPos(5, i)
        term.write(string.rep(" ", 36))
    end
    term.setCursorPos(6, cy + 2)
    term.write("Please report this error to")
    term.setCursorPos(6, cy + 3)
    term.write("GravityScore! ")

    term.setBackgroundColor(colors[theme.background])
    if isAdvanced() then centerPrint("Click to Exit...", h - 1)
    else centerPrint("Press Any Key to Exit...", h - 1) end
    while true do
        local e = os.pullEvent()
        if e == "mouse_click" or (not isAdvanced() and e == "key") then break end
    end

    -- Prevent key from being shown
    os.queueEvent(event_distract)
    os.pullEvent()
end

-- Exit
term.setBackgroundColor(colors.black)
term.setTextColor(colors.white)
term.clear()
term.setCursorPos(1, 1)
centerPrint("Thank You for Using Lua IDE " .. version)
centerPrint("Made by GravityScore")