The VimL Primer

Autoloading Functions

The main point of autoload is to make it easy to use reusable functions. To use a function from more than one script file, we place it in a script file under the autoload directory. Vim calls this kind of file a library script. We can call the functions in that file from anywhere else in the plugin.

There’s a special syntax for calling autoloaded functions. As an example, if we had a file called mpc.vim in the autoload directory and it contained the function FromAutoload, this is how we would call FromAutoload from another function:

Everything before the # represents a part of the path to the mpc.vim file; the last piece before the # is the filename ...