This gem imports a rust file similar to how require imports a ruby file. It creates wrappers for all rust functions marked pub, including type conversions for more complex things like strings.

rust_require makes ruby to rust interop completely automatic and convenient (also fast and memory safe).

Internally it makes heavy use of the awesome ffi gem and should as a result work with all three major ruby implementations.

gem install rust_require

script.rb

require 'rust_require'

class Calculator
  rust_require 'calc.rs'
end

c = Calculator.new
c.add(2,3) # => "2 + 3 = 5"
c.mul(4,7) # => "4 * 7 = 28"

calc.rs

pub fn add(x:i64, y:i64) -> String { format!("{} + {} = {}", x, y, x+y) }
pub fn mul(x:i64, y:i64) -> String { format!("{} * {} = {}", x, y, x+y) }

• Supports rust macros
• Supports free functions
• Supports struct import
• Imports the whole rust module tree

• All primitive Integers
• Currently no structs as types, but support is on the way