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module Bundler
# Finder behaves like a rubygems source index in that it responds
# to #search. It also resolves a list of dependencies finding the
# best possible configuration of gems that satisifes all requirements
# without causing any gem activation errors.
class Finder
# Takes an array of gem sources and fetches the full index of
# gems from each one. It then combines the indexes together keeping
# track of the original source so that any resolved gem can be
# fetched from the correct source.
#
# ==== Parameters
# *sources<String>:: URI pointing to the gem repository
def initialize(*sources)
@cache = {}
@index = {}
@sources = sources
end
# Searches for a gem that matches the dependency
#
# ==== Parameters
# dependency<Gem::Dependency>:: The gem dependency to search for
#
# ==== Returns
# [Gem::Specification]:: A collection of gem specifications
# matching the search
def search(dependency)
@cache[dependency.hash] ||= begin
find_by_name(dependency.name).select do |spec|
dependency =~ spec
end.sort_by {|s| s.version }
end
end
private
def find_by_name(name)
matches = @index[name] ||= begin
versions = {}
@sources.reverse_each do |source|
versions.merge! source.specs[name] || {}
end
versions
end
matches.values
end
end
end
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