Class: Descriptions

Inherits:
Object
  • Object
show all
Defined in:
Library/Homebrew/descriptions.rb

Constant Summary collapse

CACHE_FILE = 
HOMEBREW_CACHE + "desc_cache.json"

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(descriptions) ⇒ Descriptions

Create an actual instance.


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# File 'Library/Homebrew/descriptions.rb', line 114

def initialize(descriptions)
  @descriptions = descriptions
end

Class Method Details

.cache ⇒ Object 


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# File 'Library/Homebrew/descriptions.rb', line 8

def self.cache
  @cache || load_cache
end

.cache_formulae(formula_names, options = { save: true }) ⇒ Object

Given an array of formula names, add them and their descriptions to the cache. Save the updated cache to disk, unless explicitly told not to.


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# File 'Library/Homebrew/descriptions.rb', line 76

def self.cache_formulae(formula_names, options = { save: true })
  return unless cache

  formula_names.each do |name|
    begin
      @cache[name] = Formulary.factory(name).desc
    rescue FormulaUnavailableError, *FormulaVersions::IGNORED_EXCEPTIONS
      @cache.delete(name)
    end
  end
  save_cache if options[:save]
end

.cache_fresh? ⇒ Boolean

Return true if the cache exists, and none of the Taps repos were updated more recently than it was.

Returns:

  • (Boolean) 

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# File 'Library/Homebrew/descriptions.rb', line 37

def self.cache_fresh?
  return false unless CACHE_FILE.exist?
  cache_mtime = File.mtime(CACHE_FILE)

  Tap.each do |tap|
    next unless tap.git?
    repo_mtime = File.mtime(tap.path/".git/refs/heads/master")
    return false if repo_mtime > cache_mtime
  end

  true
end

.ensure_cache ⇒ Object

Create the cache if it doesn't already exist.


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# File 'Library/Homebrew/descriptions.rb', line 51

def self.ensure_cache
  generate_cache unless cache_fresh? && cache
end

.generate_cache ⇒ Object

Create a hash mapping all formulae to their descriptions; save it for future use.


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# File 'Library/Homebrew/descriptions.rb', line 27

def self.generate_cache
  @cache = {}
  Formula.each do |f|
    @cache[f.full_name] = f.desc
  end
  save_cache
end

.load_cache ⇒ Object

If the cache file exists, load it into, and return, a hash; otherwise, return nil.


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# File 'Library/Homebrew/descriptions.rb', line 14

def self.load_cache
  @cache = JSON.parse(CACHE_FILE.read) if CACHE_FILE.exist?
end

.save_cache ⇒ Object

Write the cache to disk after ensuring the existence of the containing directory.


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# File 'Library/Homebrew/descriptions.rb', line 20

def self.save_cache
  HOMEBREW_CACHE.mkpath
  CACHE_FILE.atomic_write JSON.dump(@cache)
end

.search(regex, field = :either) ⇒ Object

Given a regex, find all formulae whose specified fields contain a match.


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# File 'Library/Homebrew/descriptions.rb', line 98

def self.search(regex, field = :either)
  ensure_cache

  results = case field
  when :name
    @cache.select { |name, _| name =~ regex }
  when :desc
    @cache.select { |_, desc| desc =~ regex }
  when :either
    @cache.select { |name, desc| (name =~ regex) || (desc =~ regex) }
  end

  new(results)
end

.uncache_formulae(formula_names, options = { save: true }) ⇒ Object

Given an array of formula names, remove them and their descriptions from the cache. Save the updated cache to disk, unless explicitly told not to.


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# File 'Library/Homebrew/descriptions.rb', line 91

def self.uncache_formulae(formula_names, options = { save: true })
  return unless cache
  formula_names.each { |name| @cache.delete(name) }
  save_cache if options[:save]
end

.update_cache(report) ⇒ Object

Take a Report, as generated by cmd/update.rb. Unless the cache file exists, do nothing. If it does exist, but the Report is empty, just touch the cache file. Otherwise, use the report to update the cache.


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# File 'Library/Homebrew/descriptions.rb', line 59

def self.update_cache(report)
  return unless CACHE_FILE.exist?

  if report.empty?
    FileUtils.touch CACHE_FILE
  else
    renamings = report.select_formula(:R)
    alterations = report.select_formula(:A) + report.select_formula(:M) +
                  renamings.map(&:last)
    cache_formulae(alterations, save: false)
    uncache_formulae(report.select_formula(:D) +
                          renamings.map(&:first))
  end
end

Instance Method Details

Take search results – a hash mapping formula names to descriptions – and print them.


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# File 'Library/Homebrew/descriptions.rb', line 120

def print
  blank = Formatter.warning("[no description]")
  @descriptions.keys.sort.each do |full_name|
    short_name = short_names[full_name]
    printed_name = (short_name_counts[short_name] == 1) ? short_name : full_name
    description = @descriptions[full_name] || blank
    puts "#{Tty.bold}#{printed_name}:#{Tty.reset} #{description}"
  end
end