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gem_helper.rb - comments, fixup Gem::Version vs Gem::Requirement. Fixes #233 #234

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Jun 20, 2024
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gem_helper.rb - comments, fixup Gem::Version vs Gem::Requirement. Fixes #233 #234

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53 changes: 26 additions & 27 deletions src/testup/gem_helper.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -6,62 +6,61 @@
#-------------------------------------------------------------------------------

module TestUp

module GemHelper

# Requires a gem, and installs it as needed.
#
# If a version is specified, a matching gem of `version` or higher will be
# activated if it is already installed. The exact version will be installed otherwise.
#
# If no version is specified, the most recent version will be installed.
#
# @param [String] gem_name
# @param [String] filename
# @param [Gem::Requirement] version
def self.require(gem_name, filename, version: Gem::Requirement.default)
# @param [String, nil] version
def self.require(gem_name, filename, version: nil)
Kernel.require 'rubygems'

# restrict to major value of `version`
requirement = version ? "~> #{version[/\A\d+\.\d+/]}" : ">= 0"

begin
gem gem_name, ">=#{version}"
gem gem_name, requirement
rescue Gem::LoadError
puts "Installing Gem: #{gem_name} (Please wait...)"
begin
self.install(gem_name, version)
rescue Gem::LoadError # rubocop:disable Lint/HandleExceptions
# Needed because of Ruby 2.2. Ruby 2.0 did not need this. Seems like
# a bug. This pattern is probably not that common, to be
# programmatically installing gems.
rescue Gem::LoadError
end
gem gem_name, ">=#{version}"
gem gem_name, requirement
end
Kernel.require filename
end

# @return [String]
def self.local_copy
File.join(__dir__, 'gems')
end

# @return [Array<String>]
def self.local_gems
pattern = File.join(self.local_copy, '*.gem')
Dir.glob(pattern).to_a
end

# @param [String] gem_name
# @param [Gem::Requirement, String] gem_version
# @return [String, nil]
# @param [String, nil] gem_version
# @return [String, nil] the full path to the gem file
def self.find_local_copy(gem_name, gem_version)
self.local_gems.find { |gem_file|
basename = File.basename(gem_file)
name, version = basename.match(/^(.+)-([^-]+)\.gem$/).captures
Dir["#{__dir__}/gems/*.gem"].find { |gem_file|
basename = File.basename(gem_file, '.gem')
name, _, version = basename.rpartition '-'
gem_name.casecmp(name).zero? && gem_version.to_s.casecmp(version).zero?
}
end

# @param [String] gem_name
# @param [Gem::Requirement] version
def self.install(gem_name, version = Gem::Requirement.default)
# @param [String] version
def self.install(gem_name, version = nil)
local_path = self.find_local_copy(gem_name, version)
if local_path
puts '> Installing from local copy...'
puts "> #{local_path}"
Gem.install(local_path, nil, {domain: :local})
puts "> Installed #{gem_name}-#{version}"
else
puts '> Installing from Ruby Gems...'
puts '> Installing from rubygems.org...'
version ||= Gem::Requirement.default
Gem.install(gem_name, version)
end
end
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