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require 'semantic_puppet/dependency'
module SemanticPuppet
module Dependency
class UnsatisfiableGraph < StandardError
attr_reader :graph
def initialize(graph)
@graph = graph
deps = sentence_from_list(graph.modules)
super "Could not find satisfying releases for #{deps}"
end
private
def sentence_from_list(list)
case list.length
when 1
list.first
when 2
list.join(' and ')
else
list = list.dup
list.push("and #{list.pop}")
list.join(', ')
end
end
end
end
end
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