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-- | This module provides a declarative DSL in which the user can specify the
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-- different rules used to run the compilers.
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--
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-- The convention is to just list all items in the 'RulesM' monad, routes and
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-- compilation rules.
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--
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-- A typical usage example would be:
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--
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-- > main = hakyll $ do
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-- > route "posts/*" (setExtension "html")
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-- > compile "posts/*" someCompiler
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--
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{-# LANGUAGE GeneralizedNewtypeDeriving, OverloadedStrings #-}
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module Hakyll.Core.Rules
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( RulesM
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, Rules
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, compile
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, create
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, route
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, metaCompile
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, metaCompileWith
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) where
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import Control.Applicative ((<$>))
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import Control.Monad.Writer (tell)
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import Control.Monad.Reader (ask)
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import Control.Arrow (second, (>>>), arr, (>>^))
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import Control.Monad.State (get, put)
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import Data.Monoid (mempty)
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import Data.Typeable (Typeable)
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import Data.Binary (Binary)
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import Hakyll.Core.ResourceProvider
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import Hakyll.Core.Identifier
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import Hakyll.Core.Identifier.Pattern
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import Hakyll.Core.Compiler.Internal
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import Hakyll.Core.Routes
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import Hakyll.Core.CompiledItem
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import Hakyll.Core.Writable
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import Hakyll.Core.Rules.Internal
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-- | Add a route
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--
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tellRoute :: Routes -> Rules
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tellRoute route' = RulesM $ tell $ RuleSet route' mempty
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-- | Add a number of compilers
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--
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tellCompilers :: (Binary a, Typeable a, Writable a)
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=> [(Identifier, Compiler () a)]
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-> Rules
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tellCompilers compilers = RulesM $ tell $ RuleSet mempty $
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map (second boxCompiler) compilers
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where
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boxCompiler = (>>> arr compiledItem >>> arr CompileRule)
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-- | Add a compilation rule to the rules.
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--
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-- This instructs all resources matching the given pattern to be compiled using
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-- the given compiler. When no resources match the given pattern, nothing will
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-- happen. In this case, you might want to have a look at 'create'.
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--
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compile :: (Binary a, Typeable a, Writable a)
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=> Pattern -> Compiler () a -> Rules
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compile pattern compiler = RulesM $ do
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identifiers <- matches pattern . resourceList <$> ask
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unRulesM $ tellCompilers $ zip identifiers (repeat compiler)
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-- | Add a compilation rule
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--
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-- This sets a compiler for the given identifier. No resource is needed, since
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-- we are creating the item from scratch.
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--
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create :: (Binary a, Typeable a, Writable a)
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=> Identifier -> Compiler () a -> Rules
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create identifier compiler = tellCompilers [(identifier, compiler)]
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-- | Add a route.
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--
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-- This adds a route for all items matching the given pattern.
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--
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route :: Pattern -> Routes -> Rules
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route pattern route' = tellRoute $ ifMatch pattern route'
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-- | Apart from regular compilers, one is also able to specify metacompilers.
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-- Metacompilers are a special class of compilers: they are compilers which
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-- produce other compilers.
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--
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-- And indeed, we can see that the first argument to 'metaCompile' is a
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-- 'Compiler' which produces a list of ('Identifier', 'Compiler') pairs. The
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-- idea is simple: 'metaCompile' produces a list of compilers, and the
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-- corresponding identifiers.
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--
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-- For simple hakyll systems, it is no need for this construction. More
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-- formally, it is only needed when the content of one or more items determines
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-- which items must be rendered.
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--
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metaCompile :: (Binary a, Typeable a, Writable a)
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=> Compiler () [(Identifier, Compiler () a)]
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-- ^ Compiler generating the other compilers
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-> Rules
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-- ^ Resulting rules
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metaCompile compiler = RulesM $ do
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-- Create an identifier from the state
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state <- get
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let index = rulesMetaCompilerIndex state
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id' = fromCaptureString "Hakyll.Core.Rules.metaCompile/*" (show index)
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-- Update the state with a new identifier
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put $ state {rulesMetaCompilerIndex = index + 1}
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-- Fallback to 'metaCompileWith' with now known identifier
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unRulesM $ metaCompileWith id' compiler
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-- | Version of 'metaCompile' that allows you to specify a custom identifier for
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-- the metacompiler.
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--
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metaCompileWith :: (Binary a, Typeable a, Writable a)
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=> Identifier
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-- ^ Identifier for this compiler
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-> Compiler () [(Identifier, Compiler () a)]
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-- ^ Compiler generating the other compilers
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-> Rules
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-- ^ Resulting rules
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metaCompileWith identifier compiler = RulesM $ tell $ RuleSet mempty
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[(identifier, compiler >>> arr makeRule )]
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where
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makeRule = MetaCompileRule . map (second box)
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box = (>>> fromDependency identifier >>^ CompileRule . compiledItem)
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