Hook types

Init hooks are executed before anything else.
The variables crate_type/authors/username/os-arch and is_init are available.
The variable project-name may be available.

And only if cargo-generate was called with the --init flag, in which case it is the raw user input.
The variable project-name may be set - avoiding a user prompt!

The variable will still be subject for case changes to fit with the rust/cargo expectations.

The --name parameter still decides the final destination dir (together with the the --init flag), in order not to confuse the user.

Pre hooks are run after all placeholders mentioned in cargo-generate.toml has been resolved.
The hooks are free to add additional variables, but its too late to influence the conditional system.

This is a side effect of conditionals influencing the hooks - so placeholders need to be evaluated before the hooks are known.

Post hooks are run after template expansion, but before final output is moved to the final destination.

Why not later? Security, and the fact that a failing script still causes no errors in the users destination.