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Class: Gem::SpecFetcher

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, UserInteraction, DefaultUserInteraction, Text
Inherits: Object
Defined in: lib/rubygems/spec_fetcher.rb

Overview

SpecFetcher handles metadata updates from remote gem repositories.

Class Attribute Summary

Class Method Summary

Instance Attribute Summary

DefaultUserInteraction - Included

#ui

See DefaultUserInteraction.ui
#ui=

See DefaultUserInteraction.ui=

Instance Method Summary

UserInteraction - Included

#alert

Displays an alert statement.
#alert_error

Displays an error statement to the error output location.
#alert_warning

Displays a warning statement to the warning output location.
#ask

Asks a question and returns the answer.
#ask_for_password

Asks for a password with a prompt
#ask_yes_no

Asks a yes or no question.
#choose_from_list

Asks the user to answer question with an answer from the given list.
#say

Displays the given statement on the standard output (or equivalent).
#terminate_interaction

Terminates the RubyGems process with the given exit_code
#verbose

Calls say with msg or the results of the block if really_verbose is true.

DefaultUserInteraction - Included

#use_ui

See DefaultUserInteraction.use_ui

Text - Included

#clean_text

Remove any non-printable characters and make the text suitable for printing.
#format_text

Wraps text to wrap characters and optionally indents by indent characters.
#levenshtein_distance

This code is based directly on the Text gem implementation Returns a value representing the “cost” of transforming str1 into str2.
#truncate_text

Constructor Details

.new(sources = nil) ⇒ SpecFetcher

Creates a new SpecFetcher. Ordinarily you want to use the default fetcher from .fetcher which uses the Gem.sources.

If you need to retrieve specifications from a different source, you can send it as an argument.

[ GitHub ] 

  


# File 'lib/rubygems/spec_fetcher.rb', line 57



def initialize sources = nil
  @sources = sources || Gem.sources

  @update_cache =
    begin
      File.stat(Gem.user_home).uid == Process.uid
    rescue Errno::EACCES, Errno::ENOENT
      false
    end

  @specs = {}
  @latest_specs = {}
  @prerelease_specs = {}

  @caches = {
    :latest => @latest_specs,
    :prerelease => @prerelease_specs,
    :released => @specs,
  }

  @fetcher = Gem::RemoteFetcher.fetcher
end


  







Class Attribute Details



  

    .fetcher   (rw)
  



  

    

Default fetcher instance.  Use this instead of .new to reduce object allocation.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 42



def self.fetcher
  @fetcher ||= new
end


  







Instance Method Details



  

    #available_specs(type)  
  



  

    

Returns a list of gems available for each source in Gem.sources.



type can be one of 3 values: :released   => Return the list of all released specs :complete   => Return the list of all specs :latest     => Return the list of only the highest version of each gem :prerelease => Return the list of all prerelease only specs


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 219



def available_specs(type)
  errors = []
  list = {}

  @sources.each_source do |source|
    begin
      names = case type
              when :latest
                tuples_for source, :latest
              when :released
                tuples_for source, :released
              when :complete
                names =
                  tuples_for(source, :prerelease, true) +
                  tuples_for(source, :released)

                names.sort
              when :abs_latest
                names =
                  tuples_for(source, :prerelease, true) +
                  tuples_for(source, :latest)

                names.sort
              when :prerelease
                tuples_for(source, :prerelease)
              else
                raise Gem::Exception, "Unknown type - :#{type}"
              end
    rescue Gem::RemoteFetcher::FetchError => e
      errors << Gem::SourceFetchProblem.new(source, e)
    else
      list[source] = names
    end
  end

  [list, errors]
end


  








  

    #detect(type = :complete)  
  



  

    

Return all gem name tuples who's names match obj


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 145



def detect(type=:complete)
  tuples = []

  list, _ = available_specs(type)
  list.each do |source, specs|
    specs.each do |tup|
      if yield(tup)
        tuples << [tup, source]
      end
    end
  end

  tuples
end


  








  

    #search_for_dependency(dependency, matching_platform = true)  
  



  

    

Find and fetch gem name tuples that match dependency.



If matching_platform is false, gems for all platforms are returned.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 86



def search_for_dependency(dependency, matching_platform=true)
  found = {}

  rejected_specs = {}

  if dependency.prerelease?
    if dependency.specific?
      type = :complete
    else
      type = :abs_latest
    end
  elsif dependency.latest_version?
    type = :latest
  else
    type = :released
  end

  list, errors = available_specs(type)
  list.each do |source, specs|
    if dependency.name.is_a?(String) && specs.respond_to?(:bsearch)
      start_index = (0 ... specs.length).bsearch{ |i| specs[i].name >= dependency.name }
      end_index   = (0 ... specs.length).bsearch{ |i| specs[i].name > dependency.name }
      specs = specs[start_index ... end_index] if start_index && end_index
    end

    found[source] = specs.select do |tup|
      if dependency.match?(tup)
        if matching_platform and !Gem::Platform.match(tup.platform)
          pm = (
            rejected_specs[dependency] ||= \
              Gem::PlatformMismatch.new(tup.name, tup.version))
          pm.add_platform tup.platform
          false
        else
          true
        end
      end
    end
  end

  errors += rejected_specs.values

  tuples = []

  found.each do |source, specs|
    specs.each do |s|
      tuples << [s, source]
    end
  end

  tuples = tuples.sort_by { |x| x[0] }

  return [tuples, errors]
end


  








  

    #spec_for_dependency(dependency, matching_platform = true)  
  



  

    

Find and fetch specs that match dependency.



If matching_platform is false, gems for all platforms are returned.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 166



def spec_for_dependency(dependency, matching_platform=true)
  tuples, errors = search_for_dependency(dependency, matching_platform)

  specs = []
  tuples.each do |tup, source|
    begin
      spec = source.fetch_spec(tup)
    rescue Gem::RemoteFetcher::FetchError => e
      errors << Gem::SourceFetchProblem.new(source, e)
    else
      specs << [spec, source]
    end
  end

  return [specs, errors]
end


  








  

    #suggest_gems_from_name(gem_name)  
  



  

    

Suggests gems based on the supplied gem_name. Returns an array of alternative gem names.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/spec_fetcher.rb', line 187



def suggest_gems_from_name gem_name
  gem_name        = gem_name.downcase.tr('_-', '')
  max             = gem_name.size / 2
  names           = available_specs(:latest).first.values.flatten(1)

  matches = names.map { |n|
    next unless n.match_platform?

    distance = levenshtein_distance gem_name, n.name.downcase.tr('_-', '')

    next if distance >= max

    return [n.name] if distance == 0

    [n.name, distance]
  }.compact

  matches = matches.uniq.sort_by { |name, dist| dist }

  matches.first(5).map { |name, dist| name }
end