内容简介：Sometimes I come across cases where I need to write a simple script which uses a gem. The simplest way to go about this is toBundler has an inline gemfile definition feature that lets you define gem dependencies in a single-file Ruby script. To use this fe
Sometimes I come across cases
where I need to write a simple script which uses a gem.
The simplest way to go about this
is to gem install gem-name
and then require 'gem-name'
in your script.
However, this means that you need to remember
to install the gem before running the script.
Bundler has an inline gemfile definition feature
that lets you define gem dependencies in a single-file Ruby script.
To use this feature,
require 'bundler/inline'
and provide a gemfile
block
that has the code that you normally put in a Gemfile
.
require 'bundler/inline'
gemfile do
source 'https://rubygems.org'
gem 'benchmark-ips', require: 'benchmark/ips'
end
Benchmark.ips do |x|
x.report('original') { naive_implementation() }
x.report('optimized') { fast_implementation() }
x.compare!
end
Now running ruby myfile.rb
will automatically install the gem
and run the script.
I always have a script like the above one handy. When suggesting a performance optimization when reviewing some code, it’s useful to be able to share a script like that. This lets the PR author to easily copy and tweak it without having to worry about installing the necessary gems.
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