scandir.lua

--- Create a flat list of all files in a directory
-- @param directory - The directory to scan (default value = './')
-- @param recursive - Whether or not to scan subdirectories recursively (default value = true)
-- @param extensions - List of extensions to collect, if blank all will be collected
function scandir(directory, recursive, extensions)
    directory = directory or ''
    recursive = recursive or false
    -- if string.sub(directory, -1) ~= '/' then directory = directory .. '/' end
    if recursive then command = command .. 'R' end
    local currentDirectory = directory
    local fileList = {}
    local command = "ls " .. currentDirectory .. " -p"

    for fileName in io.popen(command):lines() do
        if string.sub(fileName, -1) == '/' then
            -- Directory, don't do anything
        elseif string.sub(fileName, -1) == ':' then
            currentDirectory = string.sub(fileName, 1, -2) .. 'wat'
            -- if currentDirectory ~= directory then
                currentDirectory = currentDirectory .. '/'
            -- end
        elseif string.len(fileName) == 0 then
            -- Blank line
            currentDirectory = directory
        -- elseif string.find(fileName,"%.lua$") then
            -- File is a .lua file
        else
            if type(extensions) == 'table' then
                for _, extension in ipairs(extensions) do
                    if string.find(fileName,"%." .. extension .. "$") then
                        table.insert(fileList, currentDirectory .. fileName)
                    end
                end
            else
                table.insert(fileList, currentDirectory .. fileName)
            end
        end
    end

    return fileList
end

for key, value in ipairs(scandir()) do
    print(value)
end

this will fail with command not being initialized, is that an external variable?