using Filesystem

# Helper function to handle errors
function check(e)
    if e !== nothing
        throw(e)
    end
end

# Create a new sub-directory in the current working directory
mkdir("subdir")

# When creating temporary directories, it's good practice to ensure their removal
# Julia doesn't have a direct equivalent to Go's defer, so we'll use a try-finally block
try
    # Helper function to create a new empty file
    function createEmptyFile(name)
        write(name, "")
    end

    createEmptyFile("subdir/file1")

    # We can create a hierarchy of directories, including parents with mkpath
    # This is similar to the command-line `mkdir -p`
    mkpath("subdir/parent/child")

    createEmptyFile("subdir/parent/file2")
    createEmptyFile("subdir/parent/file3")
    createEmptyFile("subdir/parent/child/file4")

    # readdir lists directory contents
    c = readdir("subdir/parent")

    println("Listing subdir/parent")
    for entry in c
        println(" ", entry, " ", isdir(joinpath("subdir/parent", entry)))
    end

    # cd lets us change the current working directory
    cd("subdir/parent/child")

    # Now we'll see the contents of subdir/parent/child when listing the current directory
    c = readdir(".")

    println("Listing subdir/parent/child")
    for entry in c
        println(" ", entry, " ", isdir(entry))
    end

    # cd back to where we started
    cd("../../..")

    # We can also visit a directory recursively, including all its sub-directories
    println("Visiting subdir")
    for (root, dirs, files) in walkdir("subdir")
        for file in files
            path = joinpath(root, file)
            println(" ", path, " ", isdir(path))
        end
        for dir in dirs
            path = joinpath(root, dir)
            println(" ", path, " ", isdir(path))
        end
    end

finally
    # Ensure cleanup of the created directory
    rm("subdir", recursive=true)
end