Dhall.Import refactorings
#2646
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Simply replace the value of `_newManager` with `return manager` for caching an already acquired `manager`.
Those settings as well as the lenses necessary to access their fields live now in an own internal module Dhall.Settings. This enables us to remove all fields from Dhall.Import.Status that were in fact duplicates of the fields of EvaluateSettings.
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This PR includes the following changes:
Use more lenses in
Dhall.Importand friends. My hope is that we can ultimately move to a MTL approach inDhall.Import, i.e. use(MonadIO m, MonadState Status m) => m ainstead ofStateT Status IO a.I moved
EvaluateSettingsandInputSettingsto a new (internal) moduleDhall.Settings. This enables us to have a field_evaluateSettings :: EvaluateSettingsinDhall.Import.Types.Status, since we need all the fields ofEvaluateSettingsduring import resolution anyway.A new
HasInputSettingsclass similiar toHasEvaluateSettings. The functions for the different phases in theDhallmodule now take a value ofHasInputSettings s => sinstead ofInputSettingsaccordingly.