How to extract detailed data from license_finder. Beware of caveats.

extract_license_data.rb

#!/usr/bin/env ruby

require 'license_finder'

# See lib/license_finder/core.rb for more configuration options.
# A quiet logger is required when running reports...
lf = LicenseFinder::Core.new(logger: { quiet: true })

# Groups of packages
lf.acknowledged # All (non-ignored) packages license_finder is tracking
lf.unapproved # The packages which have not been approved or whitelisted
lf.blacklisted # The packages which have been blacklisted

# Package details
lf.acknowledged.each do |package|
  # Approvals
  package.approved? # Whether the package has been approved manually or whitelisted
  package.approved_manually?
  package.whitelisted?
  package.blacklisted?
  
  # Licensing
  package.licenses # The set of licenses, each of which has a name and url, which
                   # license_finder will report for this package.
  package.activations # Additional information about how these licenses were chosen
                      # (from decision, from spec, from files, or none-found).  See
                      # LicenseFinder::Licensing and LicenseFinder::Activation
  package.license_files # The files that look like licenses, found in the package's
                        # directory.  Caveat: if a package's licenses were specified by a decision or
                        # by the package's spec, the license_files will be ignored.  That means,
                        # package.licenses may report different licenses than those found in
                        # license_files.
  package.license_files.each do |file|
    file.license # The license found in this file.
    file.text # The text of the file.  Sometimes this will be an entire README file,
              # because license_finder has found the phrase "is released under the 
              # MIT license" in it.
  end
  package.licensing.activations_from_decisions # If license_finder only knew about decisions, what licenses would it report?
  package.licensing.activations_from_spec      # If license_finder only knew about package specs, what licenses would it report?
  package.licensing.activations_from_files     # If license_finder only knew about package files, what licenses would it report?
  package.licensing.activations_from_files.each do |activation|
    # Each activation groups together all files that point to the same license.
    # Each file contains its #license and #text.
    activation.license
    activation.files
  end
end

pivotal/LicenseFinder#786