Hydrogen Version Type.
A sane replacement for Data.Version from the base package.
Hydrogen.Version is also exported by Hydrogen.Prelude where it comes with a few more instances (e.g. for Data.Serialize).
>>>Differences to Data.Version
Sane Ord instanceData.Versionrelies onOrdfor lists, which will consider1.0to be less than1.0.0.Hydrogen.Versionconsiders these to be equal.Sane Read and Show instancesWith
Hydrogen.Versionyou can just doread "1.0.0" :: Version, whereas theReadandShowinstances forData.Versiondo not give a concise representation:
show hydrogenVersion == "1.0.0"
show dataVersion == "Version versionBranch = [1,0,0], versionTags = []"Stricter APIIn
Hydrogen.Versionyou can create aVersiononly viamkVersion, whereas inData.Versionthe constructor is exported, thus you could so such nonsense asData.Version.Version [] [](which is not a proper version at all).No TagsHydrogen.Versiondoes not support tags. This is intentional, since there is no agreed upon definition forOrdin the presence of tags (consideralphavsbetavssnapshotvsgavs ...).
hydrogen-version
A sane replacement for Data.Version from the base package.
Note:Version is also exported by Hydrogen.Prelude, where it comes with some more instances (like Serialize).
Data.Version vs Hydrogen.Version
Sane Ord instance
Data.Version relies on Ord for lists, which will consider 1.0 to be less than 1.0.0. Hydrogen.Version considers these to be equal.
Sane Read and Show instances
With Hydrogen.Version you can just do read "1.0.0" :: Version, whereas the Read and Show instances for Data.Version do not give a concise representation (show dataVersion == "Version {versionBranch = [1,0], versionTags = []}").
Stricter API
In Hydrogen.Version you can create a Version only via mkVersion, whereas in Data.Version the constructor is exported, thus you could do such nonsense as Data.Version.Version [] [] (which is not a proper version at all).
No Tags
Hydrogen.Version does not support tags. This is intentional, since there is no agreed upon definition for Ord in the presence of tags (consider alpha vs beta vs snapshot vs ga vs ...).