//
// Bobrossrtx
// Tail.gs -- Implementation of the unix tail command
// Prints out content of file on change
// 
// Discord: bobrossrtx#1474
//


if params.len != 1 or params[0] == "--help" or params[0] == "-h" then
    print("Usage: "+program_path.split("/")[-1]+" <filename>")
    exit(1)
end if

inputFile = params[0]

ReadFile = function(filename)
    content = ""
    while true
        file = get_shell.host_computer.File(filename)
        if file == null then
            print("File not found: "+filename)
            exit(1)
        end if
        currContent = file.get_content

        if currContent == content then
            wait(1)
            continue
        else if currContent == null then
            clear_screen
            print("File deleted: "+filename)
            exit(1)
        else
            content = currContent
            clear_screen
            print("File changed: "+filename)
            print(content)
        end if
    end while
end function

Main = function()
    ReadFile(inputFile)
    Main
end function
Main