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

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

     # File lib/rubygems/dependency_installer.rb, line 167
167:   def find_spec_by_name_and_version gem_name, version = Gem::Requirement.default
168:     spec_and_source = nil
169: 
170:     glob = if File::ALT_SEPARATOR then
171:              gem_name.gsub File::ALT_SEPARATOR, File::SEPARATOR
172:            else
173:              gem_name
174:            end
175: 
176:     local_gems = Dir["#{glob}*"].sort.reverse
177: 
178:     unless local_gems.empty? then
179:       local_gems.each do |gem_file|
180:         next unless gem_file =~ /gem$/
181:         begin
182:           spec = Gem::Format.from_file_by_path(gem_file).spec
183:           spec_and_source = [spec, gem_file]
184:           break
185:         rescue SystemCallError, Gem::Package::FormatError
186:         end
187:       end
188:     end
189: 
190:     if spec_and_source.nil? then
191:       dep = Gem::Dependency.new gem_name, version
192:       spec_and_sources = find_gems_with_sources(dep).reverse
193: 
194:       spec_and_source = spec_and_sources.find { |spec, source|
195:         Gem::Platform.match spec.platform
196:       }
197:     end
198: 
199:     if spec_and_source.nil? then
200:       raise Gem::GemNotFoundException,
201:         "could not find gem #{gem_name} locally or in a repository"
202:     end
203: 
204:     @specs_and_sources = [spec_and_source]
205:   end

     # File lib/rubygems/dependency_installer.rb, line 120
120:   def gather_dependencies
121:     specs = @specs_and_sources.map { |spec,_| spec }
122: 
123:     dependency_list = Gem::DependencyList.new
124:     dependency_list.add(*specs)
125: 
126:     unless @ignore_dependencies then
127:       to_do = specs.dup
128:       seen = {}
129: 
130:       until to_do.empty? do
131:         spec = to_do.shift
132:         next if spec.nil? or seen[spec.name]
133:         seen[spec.name] = true
134: 
135:         deps = spec.runtime_dependencies
136:         deps |= spec.development_dependencies if @development
137: 
138:         deps.each do |dep|
139:           results = find_gems_with_sources(dep).reverse
140: 
141:           results.reject! do |dep_spec,|
142:             to_do.push dep_spec
143: 
144:             @source_index.any? do |_, installed_spec|
145:               dep.name == installed_spec.name and
146:                 dep.version_requirements.satisfied_by? installed_spec.version
147:             end
148:           end
149: 
150:           results.each do |dep_spec, source_uri|
151:             next if seen[dep_spec.name]
152:             @specs_and_sources << [dep_spec, source_uri]
153:             dependency_list.add dep_spec
154:           end
155:         end
156:       end
157:     end
158: 
159:     @gems_to_install = dependency_list.dependency_order.reverse
160:   end

     # File lib/rubygems/dependency_installer.rb, line 211
211:   def install dep_or_name, version = Gem::Requirement.default
212:     if String === dep_or_name then
213:       find_spec_by_name_and_version dep_or_name, version
214:     else
215:       @specs_and_sources = [find_gems_with_sources(dep_or_name).last]
216:     end
217: 
218:     @installed_gems = []
219: 
220:     gather_dependencies
221: 
222:     @gems_to_install.each do |spec|
223:       last = spec == @gems_to_install.last
224:       # HACK is this test for full_name acceptable?
225:       next if @source_index.any? { |n,_| n == spec.full_name } and not last
226: 
227:       # TODO: make this sorta_verbose so other users can benefit from it
228:       say "Installing gem #{spec.full_name}" if Gem.configuration.really_verbose
229: 
230:       _, source_uri = @specs_and_sources.assoc spec
231:       begin
232:         local_gem_path = Gem::RemoteFetcher.fetcher.download spec, source_uri,
233:                                                              @cache_dir
234:       rescue Gem::RemoteFetcher::FetchError
235:         next if @force
236:         raise
237:       end
238: 
239:       inst = Gem::Installer.new local_gem_path,
240:                                 :bin_dir             => @bin_dir,
241:                                 :development         => @development,
242:                                 :env_shebang         => @env_shebang,
243:                                 :force               => @force,
244:                                 :format_executable   => @format_executable,
245:                                 :ignore_dependencies => @ignore_dependencies,
246:                                 :install_dir         => @install_dir,
247:                                 :security_policy     => @security_policy,
248:                                 :source_index        => @source_index,
249:                                 :user_install        => @user_install,
250:                                 :wrappers            => @wrappers
251: 
252:       spec = inst.install
253: 
254:       @installed_gems << spec
255:     end
256: 
257:     @installed_gems
258:   end