# File lib/rubygems/dependency_installer.rb, line 43
43:   def initialize(options = {})
44:     options = DEFAULT_OPTIONS.merge options
45: 
46:     @bin_dir = options[:bin_dir]
47:     @development = options[:development]
48:     @domain = options[:domain]
49:     @env_shebang = options[:env_shebang]
50:     @force = options[:force]
51:     @format_executable = options[:format_executable]
52:     @ignore_dependencies = options[:ignore_dependencies]
53:     @security_policy = options[:security_policy]
54:     @wrappers = options[:wrappers]
55: 
56:     @installed_gems = []
57: 
58:     @install_dir = options[:install_dir] || Gem.dir
59:     @cache_dir = options[:cache_dir] || @install_dir
60: 
61:     if options[:install_dir] then
62:       spec_dir = File.join @install_dir, 'specifications'
63:       @source_index = Gem::SourceIndex.from_gems_in spec_dir
64:     else
65:       @source_index = Gem.source_index
66:     end
67:   end

     # File lib/rubygems/dependency_installer.rb, line 75
 75:   def find_gems_with_sources(dep)
 76:     gems_and_sources = []
 77: 
 78:     if @domain == :both or @domain == :local then
 79:       Dir[File.join(Dir.pwd, "#{dep.name}-[0-9]*.gem")].each do |gem_file|
 80:         spec = Gem::Format.from_file_by_path(gem_file).spec
 81:         gems_and_sources << [spec, gem_file] if spec.name == dep.name
 82:       end
 83:     end
 84: 
 85:     if @domain == :both or @domain == :remote then
 86:       begin
 87:         requirements = dep.version_requirements.requirements.map do |req, ver|
 88:           req
 89:         end
 90: 
 91:         all = requirements.length > 1 ||
 92:                 (requirements.first != ">=" and requirements.first != ">")
 93: 
 94:         found = Gem::SpecFetcher.fetcher.fetch dep, all
 95:         gems_and_sources.push(*found)
 96: 
 97:       rescue Gem::RemoteFetcher::FetchError => e
 98:         if Gem.configuration.really_verbose then
 99:           say "Error fetching remote data:\t\t#{e.message}"
100:           say "Falling back to local-only install"
101:         end
102:         @domain = :local
103:       end
104:     end
105: 
106:     gems_and_sources.sort_by do |gem, source|
107:       [gem, source =~ /^http:\/\// ? 0 : 1] # local gems win
108:     end
109:   end

     # File lib/rubygems/dependency_installer.rb, line 162
162:   def find_spec_by_name_and_version gem_name, version = Gem::Requirement.default
163:     spec_and_source = nil
164: 
165:     glob = if File::ALT_SEPARATOR then
166:              gem_name.gsub File::ALT_SEPARATOR, File::SEPARATOR
167:            else
168:              gem_name
169:            end
170: 
171:     local_gems = Dir["#{glob}*"].sort.reverse
172: 
173:     unless local_gems.empty? then
174:       local_gems.each do |gem_file|
175:         next unless gem_file =~ /gem$/
176:         begin
177:           spec = Gem::Format.from_file_by_path(gem_file).spec
178:           spec_and_source = [spec, gem_file]
179:           break
180:         rescue SystemCallError, Gem::Package::FormatError
181:         end
182:       end
183:     end
184: 
185:     if spec_and_source.nil? then
186:       dep = Gem::Dependency.new gem_name, version
187:       spec_and_sources = find_gems_with_sources(dep).reverse
188: 
189:       spec_and_source = spec_and_sources.find { |spec, source|
190:         Gem::Platform.match spec.platform
191:       }
192:     end
193: 
194:     if spec_and_source.nil? then
195:       raise Gem::GemNotFoundException,
196:         "could not find gem #{gem_name} locally or in a repository"
197:     end
198: 
199:     @specs_and_sources = [spec_and_source]
200:   end

     # File lib/rubygems/dependency_installer.rb, line 115
115:   def gather_dependencies
116:     specs = @specs_and_sources.map { |spec,_| spec }
117: 
118:     dependency_list = Gem::DependencyList.new
119:     dependency_list.add(*specs)
120: 
121:     unless @ignore_dependencies then
122:       to_do = specs.dup
123:       seen = {}
124: 
125:       until to_do.empty? do
126:         spec = to_do.shift
127:         next if spec.nil? or seen[spec.name]
128:         seen[spec.name] = true
129: 
130:         deps = spec.runtime_dependencies
131:         deps |= spec.development_dependencies if @development
132: 
133:         deps.each do |dep|
134:           results = find_gems_with_sources(dep).reverse
135: 
136:           results.reject! do |dep_spec,|
137:             to_do.push dep_spec
138: 
139:             @source_index.any? do |_, installed_spec|
140:               dep.name == installed_spec.name and
141:                 dep.version_requirements.satisfied_by? installed_spec.version
142:             end
143:           end
144: 
145:           results.each do |dep_spec, source_uri|
146:             next if seen[dep_spec.name]
147:             @specs_and_sources << [dep_spec, source_uri]
148:             dependency_list.add dep_spec
149:           end
150:         end
151:       end
152:     end
153: 
154:     @gems_to_install = dependency_list.dependency_order.reverse
155:   end

     # File lib/rubygems/dependency_installer.rb, line 206
206:   def install dep_or_name, version = Gem::Requirement.default
207:     if String === dep_or_name then
208:       find_spec_by_name_and_version dep_or_name, version
209:     else
210:       @specs_and_sources = [find_gems_with_sources(dep_or_name).last]
211:     end
212: 
213:     @installed_gems = []
214: 
215:     gather_dependencies
216: 
217:     @gems_to_install.each do |spec|
218:       last = spec == @gems_to_install.last
219:       # HACK is this test for full_name acceptable?
220:       next if @source_index.any? { |n,_| n == spec.full_name } and not last
221: 
222:       # TODO: make this sorta_verbose so other users can benefit from it
223:       say "Installing gem #{spec.full_name}" if Gem.configuration.really_verbose
224: 
225:       _, source_uri = @specs_and_sources.assoc spec
226:       begin
227:         local_gem_path = Gem::RemoteFetcher.fetcher.download spec, source_uri,
228:                                                              @cache_dir
229:       rescue Gem::RemoteFetcher::FetchError
230:         next if @force
231:         raise
232:       end
233: 
234:       inst = Gem::Installer.new local_gem_path,
235:                                 :env_shebang => @env_shebang,
236:                                 :force => @force,
237:                                 :format_executable => @format_executable,
238:                                 :ignore_dependencies => @ignore_dependencies,
239:                                 :install_dir => @install_dir,
240:                                 :security_policy => @security_policy,
241:                                 :wrappers => @wrappers,
242:                                 :bin_dir => @bin_dir,
243:                                 :development => @development
244: 
245:       spec = inst.install
246: 
247:       @installed_gems << spec
248:     end
249: 
250:     @installed_gems
251:   end