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Add boolFieldM for Compiler-dependent bool fields #1044

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Add boolFieldM for Compiler-dependent bool fields #1044

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13 changes: 12 additions & 1 deletion lib/Hakyll/Web/Template/Context.hs
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@ module Hakyll.Web.Template.Context
, Context (..)
, field
, boolField
, boolFieldM
, constField
, listField
, listFieldWith
Expand Down Expand Up @@ -147,7 +148,17 @@ boolField
:: String
-> (Item a -> Bool)
-> Context a
boolField name f = field' name (\i -> if f i
boolField name f = boolFieldM name (pure . f)

-- | Creates a 'field' to use with the @$if()$@ template macro, in the 'Compiler' monad.
-- Attempting to substitute the field into the template will cause an error.
boolFieldM
:: String
-> (Item a -> Compiler Bool)
-> Context a
boolFieldM name f = field' name (\i -> do
b <- f i
if b
then return EmptyField
else noResult $ "Field " ++ name ++ " is false")

Expand Down