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POHow to integrate Acid-State's Template Haskell into your own template haskell
 

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  1. POHow to integrate Acid-State's Template Haskell into your own template haskell
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    <p>I'm writing a template haskell library for my own use that generates functions. What I would like to do is pass these generated functions to acid-state's makeAcidic TH function. </p> <p>However, the result of simply passing the generated name in my Q context results in this error:</p> <p>is not in scope at a reify</p> <p>How do I put my freshly created functions in scope for makeAcidic to work?</p> <p>My code:</p> <pre><code>gen_render :: Name -&gt; Q [Dec] gen_render typName = do (TyConI d) &lt;- reify typName -- Get all the information on the type (type_name, vars, nars, constructors) &lt;- typeInfo (return d) -- extract name and constructors x &lt;- mapM func_def constructors let funcs = concat x let setterNames = [setter | (setter, _) &lt;- funcs] acidic &lt;- makeAcidic typName setterNames return $ [newFuncs | (_, newFuncs) &lt;- funcs] ++ acidic where func_def data_con@(con_name, compontents) = do x &lt;- mapM genFieldSetandGet compontents return $ concat x genFieldSetandGet (Just fieldName, fieldType) = do uVar &lt;- runQ $ varE $ mkName "u" ixInsert &lt;- appsE $ [[| IxSet.insert |], (varE $ mkName "u"), parensE $ appsE [(varE fieldName), (varE $ mkName "db")]] {-instanceD (cxt []) (conT (mkName "DatabaseAccess") `appT` (return fieldType) `appT` conT typName)-} let setterName = (mkName $ "updateDb" ++ (capitalize $ nameBase fieldName)) func &lt;- funD setterName $ [clause [(varP $ mkName "u"), (varP $ mkName "db")] (normalB $ [| modify |] `appE` [| IxSet.insert |] `appE` (varE $ mkName "u") ) []] return [(setterName, func)] </code></pre>
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