gem Backend

mise can be used to install CLIs from RubyGems. The code for this is inside of the mise repository at ./src/backend/gem.rs.

Dependencies

This relies on having gem (provided with ruby) installed. You can install it with or without mise. Here is how to install ruby with mise:

mise use -g ruby

The following installs the latest version of rubocop and sets it as the active version on PATH:

mise use -g gem:rubocop
rubocop --version

The version will be set in ~/.config/mise/config.toml with the following format:

toml

[tools]
"gem:rubocop" = "latest"

If the ruby version used by a gem package changes, (by mise or system ruby), you may need to reinstall the gem. This can be done with:

mise install -f gem:rubocop

Or you can reinstall all gems with:

mise install -f "gem:*"

Set these with mise settings set [VARIABLE] [VALUE] or by setting the environment variable listed.