# File lib/rubygems/dependency_installer.rb, line 38
38:   def initialize(options = {})
39:     options = DEFAULT_OPTIONS.merge options
40:     @env_shebang = options[:env_shebang]
41:     @domain = options[:domain]
42:     @force = options[:force]
43:     @format_executable = options[:format_executable]
44:     @ignore_dependencies = options[:ignore_dependencies]
45:     @install_dir = options[:install_dir] || Gem.dir
46:     @security_policy = options[:security_policy]
47:     @wrappers = options[:wrappers]
48:     @bin_dir = options[:bin_dir]
49: 
50:     @installed_gems = []
51:   end

    # File lib/rubygems/dependency_installer.rb, line 58
58:   def find_gems_with_sources(dep)
59:     gems_and_sources = []
60: 
61:     if @domain == :both or @domain == :local then
62:       Dir[File.join(Dir.pwd, "#{dep.name}-[0-9]*.gem")].each do |gem_file|
63:         spec = Gem::Format.from_file_by_path(gem_file).spec
64:         gems_and_sources << [spec, gem_file] if spec.name == dep.name
65:       end
66:     end
67: 
68:     if @domain == :both or @domain == :remote then
69:       begin
70:         requirements = dep.version_requirements.requirements.map do |req, ver|
71:           req
72:         end
73: 
74:         all = requirements.length > 1 ||
75:                 (requirements.first != ">=" and requirements.first != ">")
76: 
77:         found = Gem::SourceInfoCache.search_with_source dep, true, all
78: 
79:         gems_and_sources.push(*found)
80: 
81:       rescue Gem::RemoteFetcher::FetchError => e
82:         if Gem.configuration.really_verbose then
83:           say "Error fetching remote data:\t\t#{e.message}"
84:           say "Falling back to local-only install"
85:         end
86:         @domain = :local
87:       end
88:     end
89: 
90:     gems_and_sources.sort_by do |gem, source|
91:       [gem, source =~ /^http:\/\// ? 0 : 1] # local gems win
92:     end
93:   end

     # File lib/rubygems/dependency_installer.rb, line 129
129:   def find_spec_by_name_and_version gem_name, version = Gem::Requirement.default
130:     spec_and_source = nil
131: 
132:     glob = if File::ALT_SEPARATOR then
133:              gem_name.gsub File::ALT_SEPARATOR, File::SEPARATOR
134:            else
135:              gem_name
136:            end
137: 
138:     local_gems = Dir["#{glob}*"].sort.reverse
139: 
140:     unless local_gems.empty? then
141:       local_gems.each do |gem_file|
142:         next unless gem_file =~ /gem$/
143:         begin
144:           spec = Gem::Format.from_file_by_path(gem_file).spec
145:           spec_and_source = [spec, gem_file]
146:           break
147:         rescue SystemCallError, Gem::Package::FormatError
148:         end
149:       end
150:     end
151: 
152:     if spec_and_source.nil? then
153:       dep = Gem::Dependency.new gem_name, version
154:       spec_and_sources = find_gems_with_sources(dep).reverse
155: 
156:       spec_and_source = spec_and_sources.find { |spec, source|
157:         Gem::Platform.match spec.platform
158:       }
159:     end
160: 
161:     if spec_and_source.nil? then
162:       raise Gem::GemNotFoundException,
163:         "could not find #{gem_name} locally or in a repository"
164:     end
165: 
166:     @specs_and_sources = [spec_and_source]
167:   end

     # File lib/rubygems/dependency_installer.rb, line 98
 98:   def gather_dependencies
 99:     specs = @specs_and_sources.map { |spec,_| spec }
100: 
101:     dependency_list = Gem::DependencyList.new
102:     dependency_list.add(*specs)
103: 
104:     unless @ignore_dependencies then
105:       to_do = specs.dup
106:       seen = {}
107: 
108:       until to_do.empty? do
109:         spec = to_do.shift
110:         next if spec.nil? or seen[spec.name]
111:         seen[spec.name] = true
112: 
113:         spec.dependencies.each do |dep|
114:           results = find_gems_with_sources(dep).reverse # local gems first
115: 
116:           results.each do |dep_spec, source_uri|
117:             next if seen[dep_spec.name]
118:             @specs_and_sources << [dep_spec, source_uri]
119:             dependency_list.add dep_spec
120:             to_do.push dep_spec
121:           end
122:         end
123:       end
124:     end
125: 
126:     @gems_to_install = dependency_list.dependency_order.reverse
127:   end

     # File lib/rubygems/dependency_installer.rb, line 171
171:   def install dep_or_name, version = Gem::Requirement.default
172:     if String === dep_or_name then
173:       find_spec_by_name_and_version dep_or_name, version
174:     else
175:       @specs_and_sources = [find_gems_with_sources(dep_or_name).last]
176:     end
177: 
178:     gather_dependencies
179: 
180:     spec_dir = File.join @install_dir, 'specifications'
181:     source_index = Gem::SourceIndex.from_gems_in spec_dir
182: 
183:     @gems_to_install.each do |spec|
184:       last = spec == @gems_to_install.last
185:       # HACK is this test for full_name acceptable?
186:       next if source_index.any? { |n,_| n == spec.full_name } and not last
187: 
188:       # TODO: make this sorta_verbose so other users can benefit from it
189:       say "Installing gem #{spec.full_name}" if Gem.configuration.really_verbose
190: 
191:       _, source_uri = @specs_and_sources.assoc spec
192:       begin
193:         local_gem_path = Gem::RemoteFetcher.fetcher.download spec, source_uri,
194:                                                              @install_dir
195:       rescue Gem::RemoteFetcher::FetchError
196:         next if @force
197:         raise
198:       end
199: 
200:       inst = Gem::Installer.new local_gem_path,
201:                                 :env_shebang => @env_shebang,
202:                                 :force => @force,
203:                                 :format_executable => @format_executable,
204:                                 :ignore_dependencies => @ignore_dependencies,
205:                                 :install_dir => @install_dir,
206:                                 :security_policy => @security_policy,
207:                                 :wrappers => @wrappers,
208:                                 :bin_dir => @bin_dir
209: 
210:       spec = inst.install
211: 
212:       @installed_gems << spec
213:     end
214:   end