class R10K::Feature
Detect whether a given feature is present or absent
Attributes
name[R]
@attribute [r] name
@return [Symbol] The name of this feature
Public Class Methods
new(name, opts = {}, &block)
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@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.
# File lib/r10k/feature.rb, line 19 def initialize(name, opts = {}, &block) @name = name @libraries = Array(opts.delete(:libraries)) @block = block end
Public Instance Methods
available?()
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@return [true, false] Is this feature available?
# File lib/r10k/feature.rb, line 26 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 Instance Methods
library_available?(lib)
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# File lib/r10k/feature.rb, line 36 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
proc_available?()
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# File lib/r10k/feature.rb, line 45 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