It seems awesome, specially the --tree option.
I would love to try it, but
Download and install Rust Nightly for your platform.
Install libgit2 and cmake using your favourite package
management system (or pass --no-default-features to the
next step)
Run git clone https://github.com/ogham/exa.git to download
the latest version of exa.
Run cargo build in the new directory to compile exa.
Move the resulting target/exa executable into a directory
in your $PATH, or add an alias for it in your shell.
But what? This is some code that some dude wrote and published courteously open-source, it's written in a rather-newborn language and it is for computer-savvy users. Were you expecting a binary installer?