def message_with_trees(opts = {})
solver_name = opts.delete(:solver_name) { self.class.name.split('::').first }
possibility_type = opts.delete(:possibility_type) { 'possibility named' }
reduce_trees = opts.delete(:reduce_trees) { proc { |trees| trees.uniq.sort_by(&:to_s) } }
printable_requirement = opts.delete(:printable_requirement) { proc { |req| req.to_s } }
additional_message_for_conflict = opts.delete(:additional_message_for_conflict) { proc {} }
version_for_spec = opts.delete(:version_for_spec) { proc(&:to_s) }
incompatible_version_message_for_conflict = opts.delete(:incompatible_version_message_for_conflict) do
proc do |name, _conflict|
%(#{solver_name} could not find compatible versions for #{possibility_type} "#{name}":)
end
end
conflicts.sort.reduce(''.dup) do |o, (name, conflict)|
o << "\n" << incompatible_version_message_for_conflict.call(name, conflict) << "\n"
if conflict.locked_requirement
o << %( In snapshot (#{name_for_locking_dependency_source}):\n)
o << %( #{printable_requirement.call(conflict.locked_requirement)}\n)
o << %(\n)
end
o << %( In #{name_for_explicit_dependency_source}:\n)
trees = reduce_trees.call(conflict.requirement_trees)
o << trees.map do |tree|
t = ''.dup
depth = 2
tree.each do |req|
t << ' ' * depth << req.to_s
unless tree.last == req
if spec = conflict.activated_by_name[name_for(req)]
t << %( was resolved to #{version_for_spec.call(spec)}, which)
end
t << %( depends on)
end
t << %(\n)
depth += 1
end
t
end.join("\n")
additional_message_for_conflict.call(o, name, conflict)
o
end.strip
end