# File lib/rubygems/dependency_installer.rb, line 44
44:   def initialize(options = {})
45:     if options[:install_dir] then
46:       spec_dir = options[:install_dir], 'specifications'
47:       @source_index = Gem::SourceIndex.from_gems_in spec_dir
48:     else
49:       @source_index = Gem.source_index
50:     end
51: 
52:     options = DEFAULT_OPTIONS.merge options
53: 
54:     @bin_dir = options[:bin_dir]
55:     @development = options[:development]
56:     @domain = options[:domain]
57:     @env_shebang = options[:env_shebang]
58:     @force = options[:force]
59:     @format_executable = options[:format_executable]
60:     @ignore_dependencies = options[:ignore_dependencies]
61:     @security_policy = options[:security_policy]
62:     @user_install = options[:user_install]
63:     @wrappers = options[:wrappers]
64: 
65:     @installed_gems = []
66: 
67:     @install_dir = options[:install_dir] || Gem.dir
68:     @cache_dir = options[:cache_dir] || @install_dir
69:   end

     # File lib/rubygems/dependency_installer.rb, line 77
 77:   def find_gems_with_sources(dep)
 78:     gems_and_sources = []
 79: 
 80:     if @domain == :both or @domain == :local then
 81:       Dir[File.join(Dir.pwd, "#{dep.name}-[0-9]*.gem")].each do |gem_file|
 82:         spec = Gem::Format.from_file_by_path(gem_file).spec
 83:         gems_and_sources << [spec, gem_file] if spec.name == dep.name
 84:       end
 85:     end
 86: 
 87:     if @domain == :both or @domain == :remote then
 88:       begin
 89:         requirements = dep.version_requirements.requirements.map do |req, ver|
 90:           req
 91:         end
 92: 
 93:         all = requirements.length > 1 ||
 94:                 (requirements.first != ">=" and requirements.first != ">")
 95: 
 96:         found = Gem::SpecFetcher.fetcher.fetch dep, all
 97:         gems_and_sources.push(*found)
 98: 
 99:       rescue Gem::RemoteFetcher::FetchError => e
100:         if Gem.configuration.really_verbose then
101:           say "Error fetching remote data:\t\t#{e.message}"
102:           say "Falling back to local-only install"
103:         end
104:         @domain = :local
105:       end
106:     end
107: 
108:     gems_and_sources.sort_by do |gem, source|
109:       [gem, source =~ /^http:\/\// ? 0 : 1] # local gems win
110:     end
111:   end

     # File lib/rubygems/dependency_installer.rb, line 164
164:   def find_spec_by_name_and_version gem_name, version = Gem::Requirement.default
165:     spec_and_source = nil
166: 
167:     glob = if File::ALT_SEPARATOR then
168:              gem_name.gsub File::ALT_SEPARATOR, File::SEPARATOR
169:            else
170:              gem_name
171:            end
172: 
173:     local_gems = Dir["#{glob}*"].sort.reverse
174: 
175:     unless local_gems.empty? then
176:       local_gems.each do |gem_file|
177:         next unless gem_file =~ /gem$/
178:         begin
179:           spec = Gem::Format.from_file_by_path(gem_file).spec
180:           spec_and_source = [spec, gem_file]
181:           break
182:         rescue SystemCallError, Gem::Package::FormatError
183:         end
184:       end
185:     end
186: 
187:     if spec_and_source.nil? then
188:       dep = Gem::Dependency.new gem_name, version
189:       spec_and_sources = find_gems_with_sources(dep).reverse
190: 
191:       spec_and_source = spec_and_sources.find { |spec, source|
192:         Gem::Platform.match spec.platform
193:       }
194:     end
195: 
196:     if spec_and_source.nil? then
197:       raise Gem::GemNotFoundException,
198:         "could not find gem #{gem_name} locally or in a repository"
199:     end
200: 
201:     @specs_and_sources = [spec_and_source]
202:   end

     # File lib/rubygems/dependency_installer.rb, line 117
117:   def gather_dependencies
118:     specs = @specs_and_sources.map { |spec,_| spec }
119: 
120:     dependency_list = Gem::DependencyList.new
121:     dependency_list.add(*specs)
122: 
123:     unless @ignore_dependencies then
124:       to_do = specs.dup
125:       seen = {}
126: 
127:       until to_do.empty? do
128:         spec = to_do.shift
129:         next if spec.nil? or seen[spec.name]
130:         seen[spec.name] = true
131: 
132:         deps = spec.runtime_dependencies
133:         deps |= spec.development_dependencies if @development
134: 
135:         deps.each do |dep|
136:           results = find_gems_with_sources(dep).reverse
137: 
138:           results.reject! do |dep_spec,|
139:             to_do.push dep_spec
140: 
141:             @source_index.any? do |_, installed_spec|
142:               dep.name == installed_spec.name and
143:                 dep.version_requirements.satisfied_by? installed_spec.version
144:             end
145:           end
146: 
147:           results.each do |dep_spec, source_uri|
148:             next if seen[dep_spec.name]
149:             @specs_and_sources << [dep_spec, source_uri]
150:             dependency_list.add dep_spec
151:           end
152:         end
153:       end
154:     end
155: 
156:     @gems_to_install = dependency_list.dependency_order.reverse
157:   end

     # File lib/rubygems/dependency_installer.rb, line 208
208:   def install dep_or_name, version = Gem::Requirement.default
209:     if String === dep_or_name then
210:       find_spec_by_name_and_version dep_or_name, version
211:     else
212:       @specs_and_sources = [find_gems_with_sources(dep_or_name).last]
213:     end
214: 
215:     @installed_gems = []
216: 
217:     gather_dependencies
218: 
219:     @gems_to_install.each do |spec|
220:       last = spec == @gems_to_install.last
221:       # HACK is this test for full_name acceptable?
222:       next if @source_index.any? { |n,_| n == spec.full_name } and not last
223: 
224:       # TODO: make this sorta_verbose so other users can benefit from it
225:       say "Installing gem #{spec.full_name}" if Gem.configuration.really_verbose
226: 
227:       _, source_uri = @specs_and_sources.assoc spec
228:       begin
229:         local_gem_path = Gem::RemoteFetcher.fetcher.download spec, source_uri,
230:                                                              @cache_dir
231:       rescue Gem::RemoteFetcher::FetchError
232:         next if @force
233:         raise
234:       end
235: 
236:       inst = Gem::Installer.new local_gem_path,
237:                                 :bin_dir             => @bin_dir,
238:                                 :development         => @development,
239:                                 :env_shebang         => @env_shebang,
240:                                 :force               => @force,
241:                                 :format_executable   => @format_executable,
242:                                 :ignore_dependencies => @ignore_dependencies,
243:                                 :install_dir         => @install_dir,
244:                                 :security_policy     => @security_policy,
245:                                 :source_index        => @source_index,
246:                                 :user_install        => @user_install,
247:                                 :wrappers            => @wrappers
248: 
249:       spec = inst.install
250: 
251:       @installed_gems << spec
252:     end
253: 
254:     @installed_gems
255:   end