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Contents
require 'r10k/logging'
module R10K
# Detect whether a given feature is present or absent
class Feature
include R10K::Logging
# @attribute [r] name
# @return [Symbol] The name of this feature
attr_reader :name
# @param name [Symbol] The name of this feature
# @param opts [Hash]
# @param block [Proc] An optional block to detect if this feature is available
#
# @option opts [String, Array<String>] :libraries One or more libraries to
# require to make sure this feature is present.
def initialize(name, opts = {}, &block)
@name = name
@libraries = Array(opts.delete(:libraries))
@block = block
end
# @return [true, false] Is this feature available?
def available?
logger.debug1 { "Testing to see if feature #{@name} is available." }
rv = @libraries.all? { |lib| library_available?(lib) } && proc_available?
msg = rv ? "is" : "is not"
logger.debug1 { "Feature #{@name} #{msg} available." }
rv
end
private
def library_available?(lib)
logger.debug2 { "Attempting to load library '#{lib}' for feature #{@name}" }
require lib
true
rescue ScriptError => e
logger.debug2 { "Error while loading library #{lib} for feature #{@name}: #{e.message}" }
false
end
def proc_available?
if @block
logger.debug2 { "Evaluating proc #{@block.inspect} to test for feature #{@name}" }
output = @block.call
logger.debug2 { "Proc #{@block.inspect} for feature #{@name} returned #{output.inspect}" }
!!output
else
true
end
end
end
end
Version data entries
11 entries across 11 versions & 1 rubygems