summaryrefslogtreecommitdiffstats
path: root/gem_prelude.rb
blob: 65f3481feabe14f90f8f06c5399b8b32ba7ca784 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
# depends on: array.rb dir.rb env.rb file.rb hash.rb module.rb regexp.rb
# vim: filetype=ruby
# THIS FILE WAS AUTOGENERATED, DO NOT EDIT

# NOTICE: Ruby is during initialization here. 
#   * Encoding.default_external does not reflects -E.
#   * Should not expect Encoding.default_internal.
#   * Locale encoding is available.
if defined?(Gem) then

  module Kernel

    def gem(gem_name, *version_requirements)
      Gem.push_gem_version_on_load_path(gem_name, *version_requirements)
    end

  end

  module Gem

    class LoadError < ::LoadError
    end

    ConfigMap = {
      :sitedir => RbConfig::CONFIG["sitedir"],
      :ruby_version => RbConfig::CONFIG["ruby_version"],
      :rubylibprefix => RbConfig::CONFIG["rubylibprefix"],
      :libdir => RbConfig::CONFIG["libdir"],
      :sitelibdir => RbConfig::CONFIG["sitelibdir"],
      :arch => RbConfig::CONFIG["arch"],
      :bindir => RbConfig::CONFIG["bindir"],
      :EXEEXT => RbConfig::CONFIG["EXEEXT"],
      :RUBY_SO_NAME => RbConfig::CONFIG["RUBY_SO_NAME"],
      :ruby_install_name => RbConfig::CONFIG["ruby_install_name"]
    }

    def self.dir
      @gem_home ||= nil
      set_home(ENV['GEM_HOME'] || default_dir) unless @gem_home
      @gem_home
    end

    def self.path
      @gem_path ||= nil
      unless @gem_path
        paths = [ENV['GEM_PATH']]
        paths << APPLE_GEM_HOME if defined? APPLE_GEM_HOME
        set_paths(paths.compact.join(File::PATH_SEPARATOR))
      end
      @gem_path
    end

    def self.post_install(&hook)
      @post_install_hooks << hook
    end

    def self.post_uninstall(&hook)
      @post_uninstall_hooks << hook
    end

    def self.pre_install(&hook)
      @pre_install_hooks << hook
    end

    def self.pre_uninstall(&hook)
      @pre_uninstall_hooks << hook
    end

    def self.set_home(home)
      @gem_home = home
      ensure_gem_subdirectories(@gem_home)
    end

    def self.set_paths(gpaths)
      if gpaths
        @gem_path = gpaths.split(File::PATH_SEPARATOR)
        @gem_path << Gem.dir
      else
        @gem_path = [Gem.dir]
      end
      @gem_path.uniq!
      @gem_path.each do |gp| ensure_gem_subdirectories(gp) end
    end

    def self.ensure_gem_subdirectories(path)
    end

  
    @post_install_hooks   ||= []
    @post_uninstall_hooks ||= []
    @pre_uninstall_hooks  ||= []
    @pre_install_hooks    ||= []
  
    ##
    # An Array of the default sources that come with RubyGems
  
    def self.default_sources
      %w[http://gems.rubyforge.org/]
    end
  
    ##
    # Default home directory path to be used if an alternate value is not
    # specified in the environment
  
    def self.default_dir
      if defined? RUBY_FRAMEWORK_VERSION then
        File.join File.dirname(ConfigMap[:sitedir]), 'Gems',
                  ConfigMap[:ruby_version]
      else
        ConfigMap[:sitelibdir].sub(%r'/site_ruby/(?=[^/]+)', '/gems/')
      end
    end
  
    ##
    # Path for gems in the user's home directory
  
    def self.user_dir
      File.join(Gem.user_home, '.gem', ruby_engine,
                ConfigMap[:ruby_version])
    end
  
    ##
    # Default gem load path
  
    def self.default_path
      [user_dir, default_dir]
    end
  
    ##
    # Deduce Ruby's --program-prefix and --program-suffix from its install name
  
    def self.default_exec_format
      baseruby = ConfigMap[:BASERUBY] || 'ruby'
      ConfigMap[:RUBY_INSTALL_NAME].sub(baseruby, '%s') rescue '%s'
    end
  
    ##
    # The default directory for binaries
  
    def self.default_bindir
      if defined? RUBY_FRAMEWORK_VERSION then # mac framework support
        '/usr/bin'
      else # generic install
        ConfigMap[:bindir]
      end
    end
  
    ##
    # The default system-wide source info cache directory
  
    def self.default_system_source_cache_dir
      File.join Gem.dir, 'source_cache'
    end
  
    ##
    # The default user-specific source info cache directory
  
    def self.default_user_source_cache_dir
      File.join Gem.user_home, '.gem', 'source_cache'
    end
  
    ##
    # A wrapper around RUBY_ENGINE const that may not be defined
  
    def self.ruby_engine
      if defined? RUBY_ENGINE then
        RUBY_ENGINE
      else
        'ruby'
      end
    end
  
  

    # Methods before this line will be removed when QuickLoader is replaced
    # with the real RubyGems

    GEM_PRELUDE_METHODS = Gem.methods(false)

    begin
      verbose, debug = $VERBOSE, $DEBUG
      $DEBUG = $VERBOSE = nil

      begin
        require 'rubygems/defaults/operating_system'
      rescue ::LoadError
      end

      if defined?(RUBY_ENGINE) then
        begin
          require "rubygems/defaults/#{RUBY_ENGINE}"
        rescue ::LoadError
        end
      end
    ensure
      $VERBOSE, $DEBUG = verbose, debug
    end

    module QuickLoader

      @loaded_full_rubygems_library = false

      def self.load_full_rubygems_library
        return if @loaded_full_rubygems_library

        @loaded_full_rubygems_library = true

        class << Gem
          Gem::GEM_PRELUDE_METHODS.each do |method_name|
            undef_method method_name
          end
        end

        Kernel.module_eval do
          undef_method :gem if method_defined? :gem
        end

        $".delete File.join(Gem::ConfigMap[:rubylibprefix],
                            Gem::ConfigMap[:ruby_version], 'rubygems.rb')

        require 'rubygems'
      end

      GemPaths = {}
      GemVersions = {}

      def push_gem_version_on_load_path(gem_name, *version_requirements)
        if version_requirements.empty?
          unless GemPaths.has_key?(gem_name)
            raise Gem::LoadError.new("Could not find RubyGem #{gem_name} (>= 0)\n")
          end

          # highest version gems already active
          return false
        else
          if version_requirements.length > 1
            QuickLoader.load_full_rubygems_library
            return gem(gem_name, *version_requirements)
          end

          requirement, version = version_requirements[0].split
          requirement.strip!

          if loaded_version = GemVersions[gem_name]
            case requirement
            when ">", ">="
              if (loaded_version <=> Gem.calculate_integers_for_gem_version(version)) >= 0
                return false
              end
            when "~>"
              required_version = Gem.calculate_integers_for_gem_version(version)
              if (loaded_version[0] == required_version[0])
                return false
              end
            end
          end

          QuickLoader.load_full_rubygems_library
          gem(gem_name, *version_requirements)
        end
      end

      def calculate_integers_for_gem_version(gem_version)
        numbers = gem_version.split(".").collect {|n| n.to_i}
        numbers.pop while numbers.last == 0
        numbers << 0 if numbers.empty?
        numbers
      end

      def push_all_highest_version_gems_on_load_path
        Gem.path.each do |path|
          gems_directory = File.join(path, "gems")
          if File.exist?(gems_directory)
            Dir.entries(gems_directory).each do |gem_directory_name|
              next if gem_directory_name == "." || gem_directory_name == ".."
              dash = gem_directory_name.rindex("-")
              next if dash.nil?
              gem_name = gem_directory_name[0...dash]
              current_version = GemVersions[gem_name]
              new_version = calculate_integers_for_gem_version(gem_directory_name[dash+1..-1])
              if current_version
                if (current_version <=> new_version) == -1
                  GemVersions[gem_name] = new_version
                  GemPaths[gem_name] = File.join(gems_directory, gem_directory_name)
                end
              else
                GemVersions[gem_name] = new_version
                GemPaths[gem_name] = File.join(gems_directory, gem_directory_name)
              end
            end
          end
        end

        require_paths = []

        GemPaths.each_value do |path|
          if File.exist?(file = File.join(path, ".require_paths")) then
            paths = File.read(file).split.map do |require_path|
              File.join path, require_path
            end

            require_paths.concat paths
          else
            require_paths << file if File.exist?(file = File.join(path, "bin"))
            require_paths << file if File.exist?(file = File.join(path, "lib"))
          end
        end

        # "tag" the first require_path inserted into the $LOAD_PATH to enable
        # indexing correctly with rubygems proper when it inserts an explicitly
        # gem version
        unless require_paths.empty?
          require_paths.first.instance_variable_set(:@gem_prelude_index, true)
        end
        # gem directories must come after -I and ENV['RUBYLIB']
        $:[$:.index(ConfigMap[:sitelibdir]),0] = require_paths
      end

      def const_missing(constant)
        QuickLoader.load_full_rubygems_library
        if Gem.const_defined?(constant)
          Gem.const_get(constant)
        else
          super
        end
      end

      def method_missing(method, *args, &block)
        QuickLoader.load_full_rubygems_library
        super unless Gem.respond_to?(method)
        Gem.send(method, *args, &block)
      end
    end

    extend QuickLoader

  end

  begin
    Gem.push_all_highest_version_gems_on_load_path
    $" << File.join(Gem::ConfigMap[:rubylibprefix], 
                    Gem::ConfigMap[:ruby_version], "rubygems.rb")
  rescue Exception => e
    puts "Error loading gem paths on load path in gem_prelude"
    puts e
    puts e.backtrace.join("\n")
  end

end