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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)
@results = {}
@index = Hash.new { |h,k| h[k] = {} }
sources.each { |source| fetch(source) }
end
# Figures out the best possible configuration of gems that satisfies
# the list of passed dependencies and any child dependencies without
# causing any gem activation errors.
#
# ==== Parameters
# *dependencies<Gem::Dependency>:: The list of dependencies to resolve
#
# ==== Returns
# <GemBundle>,nil:: If the list of dependencies can be resolved, a
# collection of gemspecs is returned. Otherwise, nil is returned.
def resolve(*dependencies)
Bundler.logger.info "Calculating dependencies..."
resolved = Resolver.resolve(dependencies, self)
resolved && GemBundle.new(resolved)
end
# Fetches the index from the remote source
#
# ==== Parameters
# source<String>:: URI pointing to the gem repository
#
# ==== Raises
# ArgumentError:: If the source is not a valid gem repository
def fetch(source)
Bundler.logger.info "Updating source: #{source}"
deflated = Gem::RemoteFetcher.fetcher.fetch_path("#{source}/Marshal.4.8.Z")
inflated = Gem.inflate deflated
append(Marshal.load(inflated), source)
rescue Gem::RemoteFetcher::FetchError => e
raise ArgumentError, "#{source} is not a valid source: #{e.message}"
end
# Adds a new gem index linked to a gem source to the over all
# gem index that gets searched.
#
# ==== Parameters
# index<Gem::SourceIndex>:: The index to append to the list
# source<String>:: The original source
def append(index, source)
index.gems.values.each do |spec|
next unless Gem::Platform.match(spec.platform)
spec.source = source
@index[spec.name][spec.version] ||= spec
end
self
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)
@results[dependency.hash] ||= begin
possibilities = @index[dependency.name].values
possibilities.select do |spec|
dependency =~ spec
end.sort_by {|s| s.version }
end
end
end
end
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