How to find the path a Ruby Gem is installed at (i.e. Gem.lib_path c.f. Gem.bin_path)

Question

Gem.bin_path(\'cucumber\', \'cucumber\')

Will return the binary/executable\'s path. It seems there is no such function to return the library path.

Answer 1

After the gem has been loaded with require, you find the lib path using Gem.loaded_specs as follows:

require 'rubygems'
require 'cucumber'
gem_root = Gem.loaded_specs['cucumber'].full_gem_path
gem_lib = File.join(gem_root, 'lib')