xmonad-config/lib/Data/Internal/Dependency.hs

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{-# LANGUAGE DeriveFunctor #-}
{-# LANGUAGE DeriveGeneric #-}
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{-# LANGUAGE GADTs #-}
{-# LANGUAGE RankNTypes #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE TupleSections #-}
--------------------------------------------------------------------------------
-- | Functions for handling dependencies
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module Data.Internal.Dependency
-- feature types
( Feature
, Always(..)
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, Always_(..)
, FallbackRoot(..)
, FallbackStack(..)
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, Sometimes(..)
, Sometimes_
, AlwaysX
, AlwaysIO
, SometimesX
, SometimesIO
, PostPass(..)
, Subfeature(..)
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, SubfeatureRoot
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, Msg(..)
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, LogLevel(..)
-- configuration
, XParams(..)
, XPFeatures(..)
, XPQuery
-- dependency tree types
, Root(..)
, Tree(..)
, Tree_(..)
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, IOTree
, IOTree_
, DBusTree
, DBusTree_
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, SafeClient(..)
, IODependency(..)
, IODependency_(..)
, SystemDependency(..)
, DBusDependency_(..)
, DBusMember(..)
, UnitType(..)
, Result
, Fulfillment(..)
, ArchPkg(..)
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-- dumping
, dumpFeature
, dumpAlways
, dumpSometimes
, jsonArray
, JSONQuotable(..)
, JSONUnquotable(..)
, JSONMixed(..)
-- testing
, FIO
, withCache
, evalFeature
, executeSometimes
, executeAlways
, evalAlways
, evalSometimes
, fontTreeAlt
, fontTree
, fontTree_
, fontAlways
, fontSometimes
, readEthernet
, readWireless
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, socketExists
-- lifting
, ioSometimes
, ioAlways
-- feature construction
, always1
, sometimes1
, sometimesIO
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, sometimesIO_
, sometimesDBus
, sometimesExe
, sometimesExeArgs
, sometimesEndpoint
-- dependency construction
, sysExe
, localExe
, sysdSystem
, sysdUser
, listToAnds
, toAnd_
, toFallback
, pathR
, pathRW
, pathW
, voidResult
, voidRead
, process
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-- misc
, shellTest
) where
import Control.Monad.IO.Class
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import Control.Monad.Identity
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import Control.Monad.Reader
import Control.Monad.State
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import Data.Aeson hiding (Error, Result)
import Data.Aeson.Key
import Data.Bifunctor
import Data.Either
import qualified Data.HashMap.Strict as H
import Data.Hashable
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import Data.Internal.DBus
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import Data.List
import Data.Maybe
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import Data.Yaml
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import GHC.Generics (Generic)
import GHC.IO.Exception (ioe_description)
import DBus hiding (typeOf)
import qualified DBus.Introspection as I
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import System.Directory
import System.Environment
import System.Exit
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import System.FilePath
import System.IO.Error
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import System.Posix.Files
import XMonad.Core (X, io)
import XMonad.Internal.IO
import XMonad.Internal.Process
import XMonad.Internal.Shell
import XMonad.Internal.Theme
--------------------------------------------------------------------------------
-- | Feature Evaluation
--
-- Here we attempt to build and return the monadic actions encoded by each
-- feature.
-- | Run feature evaluation(s) with the cache
-- Currently there is no easy way to not use this (oh well)
withCache :: FIO a -> IO a
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withCache x = do
p <- getParams
evalStateT (runReaderT x p) emptyCache
-- | Execute an Always immediately
executeAlways :: Always (IO a) -> FIO a
executeAlways = io <=< evalAlways
-- | Execute a Sometimes immediately (or do nothing if failure)
executeSometimes :: Sometimes (IO a) -> FIO (Maybe a)
executeSometimes a = maybe (return Nothing) (io . fmap Just) =<< evalSometimes a
-- | Possibly return the action of an Always/Sometimes
evalFeature :: Feature a -> FIO (Maybe a)
evalFeature (Right a) = Just <$> evalAlways a
evalFeature (Left s) = evalSometimes s
-- | Possibly return the action of a Sometimes
evalSometimes :: Sometimes a -> FIO (Maybe a)
evalSometimes x = either goFail goPass =<< evalSometimesMsg x
where
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goPass (a, ws) = putErrors ws >> return (Just a)
goFail es = putErrors es >> return Nothing
putErrors = mapM_ printMsg
-- | Return the action of an Always
evalAlways :: Always a -> FIO a
evalAlways a = do
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(x, ws) <- evalAlwaysMsg a
mapM_ printMsg ws
return x
printMsg :: FMsg -> FIO ()
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printMsg (FMsg fn n (Msg ll m)) = do
xl <- asks xpLogLevel
p <- io getProgName
io $ when (ll <= xl) $ putStrLn $ unwords $ s p
where
s p = [ bracket p
, bracket $ show ll
, bracket fn
]
++ maybe [] ((:[]) . bracket) n
++ [m]
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--------------------------------------------------------------------------------
-- | Feature status
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-- | Dump the status of a Feature
dumpFeature :: Feature a -> FIO JSONUnquotable
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dumpFeature = either dumpSometimes dumpAlways
-- | Dump the status of an Always to stdout
dumpAlways :: Always a -> FIO JSONUnquotable
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dumpAlways (Always n x) = go [] x
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where
go failed (Option o os) = do
(s, r) <- dumpSubfeatureRoot o
if r
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then return $ jsonAlways (Q n) (Just s) failed $ untested [] os
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else go (s:failed) os
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go failed (Always_ _) = return $ jsonAlways (Q n) (Just (UQ "true")) failed []
untested acc (Always_ _) = acc
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untested acc (Option o os) = untested (dataSubfeatureRoot o:acc) os
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-- | Dump the status of a Sometimes to stdout
dumpSometimes :: Sometimes a -> FIO JSONUnquotable
dumpSometimes (Sometimes n _ a) = go [] a
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where
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go failed [] = return $ jsonSometimes (Q n) Nothing failed []
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go failed (x:xs) = do
(s, r) <- dumpSubfeatureRoot x
if r
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then return $ jsonSometimes (Q n) (Just s) failed $ fmap dataSubfeatureRoot xs
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else go (s:failed) xs
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--------------------------------------------------------------------------------
-- | Wrapper types
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type AlwaysX = Always (X ())
type AlwaysIO = Always (IO ())
type SometimesX = Sometimes (X ())
type SometimesIO = Sometimes (IO ())
type Feature a = Either (Sometimes a) (Always a)
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--------------------------------------------------------------------------------
-- | Feature declaration
-- | Feature that is guaranteed to work
-- This is composed of sub-features that are tested in order, and if all fail
-- the fallback is a monadic action (eg a plain haskell function)
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data Always a = Always String (Always_ a)
-- | Feature that is guaranteed to work (inner data)
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data Always_ a = Option (SubfeatureRoot a) (Always_ a)
| Always_ (FallbackRoot a)
-- | Root of a fallback action for an always
-- This may either be a lone action or a function that depends on the results
-- from other Always features.
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data FallbackRoot a = FallbackAlone a
| forall p. FallbackTree (p -> a) (FallbackStack p)
-- | Always features that are used as a payload for a fallback action
data FallbackStack p = FallbackBottom (Always p)
| forall x y. FallbackStack (x -> y -> p) (Always x) (FallbackStack y)
-- | Feature that might not be present
-- This is like an Always except it doesn't fall back on a guaranteed monadic
-- action
data Sometimes a = Sometimes String XPQuery (Sometimes_ a)
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-- | Feature that might not be present (inner data)
type Sometimes_ a = [SubfeatureRoot a]
-- | Individually tested sub-feature data for Always/sometimes
-- The polymorphism allows representing tested and untested states. Includes
-- the 'action' itself to be tested and any auxilary data for describing the
-- sub-feature.
data Subfeature f = Subfeature
{ sfData :: f
, sfName :: String
}
-- | Loglevel at which feature testing should be reported
-- This is currently not used for anything important
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data LogLevel = Silent | Error | Warn | Debug | Info
deriving (Eq, Show, Ord, Generic)
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type SubfeatureRoot a = Subfeature (Root a)
-- | An action and its dependencies
-- May be a plain old monad or be DBus-dependent, in which case a client is
-- needed
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data Root a = forall p. IORoot (p -> a) (IOTree p)
| IORoot_ a IOTree_
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| forall c p. SafeClient c => DBusRoot (p -> c -> a) (DBusTree c p) (Maybe c)
| forall c. SafeClient c => DBusRoot_ (c -> a) (DBusTree_ c) (Maybe c)
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-- | The dependency tree with rule to merge results when needed
data Tree d d_ p =
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forall x y. And12 (x -> y -> p) (Tree d d_ x) (Tree d d_ y)
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| And1 (Tree d d_ p) (Tree_ d_)
| And2 (Tree_ d_) (Tree d d_ p)
| Or (Tree d d_ p) (Tree d d_ p)
| Only (d p)
-- | A dependency tree without functions to merge results
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data Tree_ d = And_ (Tree_ d) (Tree_ d) | Or_ (Tree_ d) (Tree_ d) | Only_ d
-- | Shorthand tree types for lazy typers
type IOTree p = Tree IODependency IODependency_ p
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type DBusTree c p = Tree IODependency (DBusDependency_ c) p
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type IOTree_ = Tree_ IODependency_
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type DBusTree_ c = Tree_ (DBusDependency_ c)
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-- | A dependency that only requires IO to evaluate (with payload)
data IODependency p =
-- a cachable IO action that yields a payload
IORead String [Fulfillment] (FIO (Result p))
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-- always yields a payload
| IOConst p
-- an always that yields a payload
| forall a. IOAlways (Always a) (a -> p)
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-- a sometimes that yields a payload
| forall a. IOSometimes (Sometimes a) (a -> p)
-- | A dependency pertaining to the DBus
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data DBusDependency_ c = Bus [Fulfillment] BusName
| Endpoint [Fulfillment] BusName ObjectPath InterfaceName DBusMember
| DBusIO IODependency_
deriving (Eq, Generic)
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instance Hashable (DBusDependency_ c) where
hashWithSalt s (Bus f b) = s `hashWithSalt` f
`hashWithSalt` formatBusName b
hashWithSalt s (Endpoint f b o i m) = s `hashWithSalt` f
`hashWithSalt` formatBusName b
`hashWithSalt` formatObjectPath o
`hashWithSalt` formatInterfaceName i
`hashWithSalt` m
hashWithSalt s (DBusIO i) = hashWithSalt s i
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-- | A dependency that only requires IO to evaluate (no payload)
data IODependency_ = IOSystem_ [Fulfillment] SystemDependency
| IOTest_ String [Fulfillment] (IO (Maybe Msg))
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| forall a. IOSometimes_ (Sometimes a)
instance Eq IODependency_ where
(==) (IOSystem_ f0 s0) (IOSystem_ f1 s1) = f0 == f1 && s0 == s1
(==) (IOTest_ {}) (IOTest_ {}) = False
(==) (IOSometimes_ _) (IOSometimes_ _) = False
(==) _ _ = False
instance Hashable IODependency_ where
hashWithSalt s (IOSystem_ f y) = s `hashWithSalt` f
`hashWithSalt` y
hashWithSalt s (IOTest_ n f _) = s `hashWithSalt` n
`hashWithSalt` f
hashWithSalt s (IOSometimes_ (Sometimes n _ _)) = hashWithSalt s n
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-- | A system component to an IODependency
-- This name is dumb, but most constructors should be obvious
data SystemDependency =
Executable Bool FilePath
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| AccessiblePath FilePath Bool Bool
| Systemd UnitType String
| Process String
deriving (Eq, Show, Generic)
instance Hashable SystemDependency
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-- | The type of a systemd service
data UnitType = SystemUnit | UserUnit deriving (Eq, Show, Generic)
instance Hashable UnitType
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-- | Wrapper type to describe and endpoint
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data DBusMember = Method_ MemberName
| Signal_ MemberName
| Property_ String
deriving (Eq, Show, Generic)
instance Hashable DBusMember where
hashWithSalt s (Method_ m) = hashWithSalt s $ formatMemberName m
hashWithSalt s (Signal_ m) = hashWithSalt s $ formatMemberName m
hashWithSalt s (Property_ p) = hashWithSalt s p
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-- TODO there is a third type of package: not in aur or official
-- | A means to fulfill a dependency
-- For now this is just the name of an Arch Linux package (AUR or official)
data Fulfillment = Package ArchPkg String deriving (Eq, Show)
instance Hashable Fulfillment where
hashWithSalt s (Package a n) = s `hashWithSalt` a `hashWithSalt` n
data ArchPkg = Official | AUR | Custom deriving (Eq, Show, Generic)
instance Hashable ArchPkg
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--------------------------------------------------------------------------------
-- | Tested dependency tree
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--
-- The main reason I need this is so I have a "result" I can convert to JSON
-- and dump on the CLI (unless there is a way to make Aeson work inside an IO)
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-- | A message with criteria for when to show it
data Msg = Msg LogLevel String
-- | A message annotated with subfeature and feature name
data FMsg = FMsg String (Maybe String) Msg
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-- | Tested Always feature
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data PostAlways a = Primary (SubfeaturePass a) [SubfeatureFail] (Always_ a)
| Fallback a [SubfeatureFail]
-- | Tested Sometimes feature
data PostSometimes a = PostSometimes
{ psSuccess :: Maybe (SubfeaturePass a)
, psFailed :: [SubfeatureFail]
}
-- | Passing subfeature
type SubfeaturePass a = Subfeature (PostPass a)
-- | Failed subfeature
type SubfeatureFail = Subfeature PostFail
-- | An action that passed
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data PostPass a = PostPass a [Msg] deriving (Functor)
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addMsgs :: PostPass a -> [Msg] -> PostPass a
addMsgs (PostPass a ms) ms' = PostPass a $ ms ++ ms'
-- | An action that failed
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data PostFail = PostFail [Msg] | PostMissing Msg
--------------------------------------------------------------------------------
-- | Evaluation cache
--
-- Setting up trees like this usually entails having some repeated dependencies.
-- Testing the same dependency multiple times is stupid, so cache the results.
-- Note this is basically memorization, except that the results are IO-dependent
-- and this may technically change with each invocation. The assumption here is
-- that each repeated test without caching would be run in such close succession
-- that the results will always be the same.
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-- TODO cache DBus calls
emptyCache :: Cache
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emptyCache = Cache H.empty H.empty
memoizeIO_ :: (IODependency_ -> FIO Result_) -> IODependency_ -> FIO Result_
memoizeIO_ f d = do
m <- gets cIO_
case H.lookup d m of
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(Just r) -> return $ info "retrieving from to cache" r
Nothing -> do
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r <- info "adding to cache" <$> f d
modify (\s -> s { cIO_ = H.insert d r (cIO_ s) })
return r
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where
info m = fmap (++ [Msg Info m])
memoizeFont :: (String -> IO (Result FontBuilder)) -> String -> FIO (Result FontBuilder)
memoizeFont f d = do
m <- gets cFont
case H.lookup d m of
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(Just r) -> return $ info "retrieving from cache" r
Nothing -> do
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r <- io $ info "adding to cache" <$> f d
modify (\s -> s { cFont = H.insert d r (cFont s) })
return r
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where
info m = fmap (`addMsgs` [Msg Info m])
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--------------------------------------------------------------------------------
-- | Configuration
type FIO a = ReaderT XParams (StateT Cache IO) a
data XParams = XParams
{ xpLogLevel :: LogLevel
, xpFeatures :: XPFeatures
}
instance FromJSON XParams where
parseJSON = withObject "parameters" $ \o -> XParams
<$> o .: fromString "loglevel"
<*> o .: fromString "features"
instance FromJSON LogLevel
data XPFeatures = XPFeatures
{ xpfOptimus :: Bool
, xpfVirtualBox :: Bool
, xpfXSANE :: Bool
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, xpfEthernet :: Bool
, xpfWireless :: Bool
, xpfVPN :: Bool
, xpfBluetooth :: Bool
, xpfIntelBacklight :: Bool
, xpfClevoBacklight :: Bool
, xpfBattery :: Bool
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, xpfF5VPN :: Bool
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}
instance FromJSON XPFeatures where
parseJSON = withObject "features" $ \o -> XPFeatures
<$> o .:+ "optimus"
<*> o .:+ "virtualbox"
<*> o .:+ "xsane"
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<*> o .:+ "ethernet"
<*> o .:+ "wireless"
<*> o .:+ "vpn"
<*> o .:+ "bluetooth"
<*> o .:+ "intel_backlight"
<*> o .:+ "clevo_backlight"
<*> o .:+ "battery"
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<*> o .:+ "f5vpn"
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defParams :: XParams
defParams = XParams
{ xpLogLevel = Error
, xpFeatures = defXPFeatures
}
defXPFeatures :: XPFeatures
defXPFeatures = XPFeatures
{ xpfOptimus = False
, xpfVirtualBox = False
, xpfXSANE = False
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, xpfEthernet = False
, xpfWireless = False
-- TODO this might be broken down into different flags (expressvpn, etc)
, xpfVPN = False
, xpfBluetooth = False
, xpfIntelBacklight = False
, xpfClevoBacklight = False
, xpfBattery = False
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, xpfF5VPN = False
}
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type XPQuery = XPFeatures -> Bool
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data Cache = Cache
{ --cIO :: forall p. Memoizable p => H.HashMap (IODependency p) (Result p)
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cIO_ :: H.HashMap IODependency_ Result_
-- , cDBus_ :: forall c. H.HashMap (DBusDependency_ c) Result_
, cFont :: H.HashMap String (Result FontBuilder)
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}
getParams :: IO XParams
getParams = do
p <- getParamFile
maybe (return defParams) decodeYaml p
where
decodeYaml p = either (\e -> print e >> return defParams) return
=<< decodeFileEither p
getParamFile :: IO (Maybe FilePath)
getParamFile = do
e <- lookupEnv "XDG_CONFIG_HOME"
parent <- case e of
Nothing -> fallback
Just path
| isRelative path -> fallback
| otherwise -> return path
let full = parent </> "xmonad.yml"
(\x -> if x then Just full else Nothing) <$> fileExist full
where
fallback = (</> ".config") <$> getHomeDirectory
(.:+) :: Object -> String -> Parser Bool
(.:+) o n = o .:? fromString n .!= False
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infix .:+
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--------------------------------------------------------------------------------
-- | Testing pipeline
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evalSometimesMsg :: Sometimes a -> FIO (Either [FMsg] (a, [FMsg]))
evalSometimesMsg (Sometimes n u xs) = do
r <- asks (u . xpFeatures)
if not r then return $ Left [dis n] else do
PostSometimes { psSuccess = s, psFailed = fs } <- testSometimes xs
let fs' = failedMsgs n fs
return $ case s of
(Just p) -> Right $ second (++ fs') $ passActMsg n p
_ -> Left fs'
where
dis name = FMsg name Nothing (Msg Debug "feature disabled")
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evalAlwaysMsg :: Always a -> FIO (a, [FMsg])
evalAlwaysMsg (Always n x) = do
r <- testAlways x
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return $ case r of
(Primary p fs _) -> second (++ failedMsgs n fs) $ passActMsg n p
(Fallback act fs) -> (act, failedMsgs n fs)
passActMsg :: String -> SubfeaturePass a -> (a, [FMsg])
passActMsg fn Subfeature { sfData = PostPass a ws, sfName = n } = (a, fmap (FMsg fn (Just n)) ws)
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failedMsgs :: String -> [SubfeatureFail] -> [FMsg]
failedMsgs n = concatMap (failedMsg n)
failedMsg :: String -> SubfeatureFail -> [FMsg]
failedMsg fn Subfeature { sfData = d, sfName = n } = case d of
(PostFail es) -> f es
(PostMissing e) -> f [e]
where
f = fmap (FMsg fn (Just n))
testAlways :: Always_ a -> FIO (PostAlways a)
testAlways = go []
where
go failed (Option fd next) = do
r <- testSubfeature fd
case r of
(Left l) -> go (l:failed) next
(Right pass) -> return $ Primary pass failed next
go failed (Always_ ar) = (`Fallback` failed) <$> evalFallbackRoot ar
evalFallbackRoot :: FallbackRoot a -> FIO a
evalFallbackRoot (FallbackAlone a) = return a
evalFallbackRoot (FallbackTree a s) = a <$> evalFallbackStack s
evalFallbackStack :: FallbackStack p -> FIO p
evalFallbackStack (FallbackBottom a) = evalAlways a
evalFallbackStack (FallbackStack f a as) = do
ps <- evalFallbackStack as
p <- evalAlways a
return $ f p ps
testSometimes :: Sometimes_ a -> FIO (PostSometimes a)
testSometimes = go (PostSometimes Nothing [])
where
go ts [] = return ts
go ts (x:xs) = do
sf <- testSubfeature x
case sf of
(Left l) -> go (ts { psFailed = l:psFailed ts }) xs
(Right pass) -> return $ ts { psSuccess = Just pass }
testSubfeature :: SubfeatureRoot a -> FIO (Either SubfeatureFail (SubfeaturePass a))
testSubfeature sf@Subfeature{ sfData = t } = do
t' <- testRoot t
-- monomorphism restriction :(
return $ bimap (\n -> sf { sfData = n }) (\n -> sf { sfData = n }) t'
testRoot :: Root a -> FIO (Either PostFail (PostPass a))
testRoot r = do
case r of
(IORoot a t) -> go a testIODependency_ testIODependency t
(IORoot_ a t) -> go_ a testIODependency_ t
(DBusRoot a t (Just cl)) -> go (`a` cl) (testDBusDependency_ cl) testIODependency t
(DBusRoot_ a t (Just cl)) -> go_ (a cl) (testDBusDependency_ cl) t
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_ -> return $ Left $ PostMissing
$ Msg Error "client not available"
where
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-- rank N polymorphism is apparently undecidable...gross
go a f_ (f :: forall q. d q -> FIO (Result q)) t =
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bimap PostFail (fmap a) <$> testTree f_ f t
go_ a f_ t = bimap PostFail (PostPass a) <$> testTree_ f_ t
--------------------------------------------------------------------------------
-- | Payloaded dependency testing
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type Result p = Either [Msg] (PostPass p)
testTree :: forall d d_ p. (d_ -> FIO Result_) -> (forall q. d q -> FIO (Result q))
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-> Tree d d_ p -> FIO (Either [Msg] (PostPass p))
testTree test_ test = go
where
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go :: forall q. Tree d d_ q -> FIO (Either [Msg] (PostPass q))
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go (And12 f a b) = do
ra <- go a
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liftRight (\pa -> (and2nd f pa =<<) <$> go b) ra
go (And1 a b) = do
ra <- go a
liftRight (\p -> fmap (addMsgs p) <$> testTree_ test_ b) ra
go (And2 a b) = do
ra <- testTree_ test_ a
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liftRight (\wa -> fmap (`addMsgs` wa) <$> go b) ra
go (Or a b) = do
ra <- go a
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either (\ea -> fmap (`addMsgs` ea) <$> go b) (return . Right) ra
go (Only a) = test a
and2nd f (PostPass pa wa) (PostPass pb wb) = Right $ PostPass (f pa pb) $ wa ++ wb
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liftRight = either (return . Left)
testIODependency :: IODependency p -> FIO (Result p)
testIODependency (IORead _ _ t) = t
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testIODependency (IOConst c) = return $ Right $ PostPass c []
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-- TODO this is a bit odd because this is a dependency that will always
-- succeed, which kinda makes this pointless. The only reason I would want this
-- is if I want to have a built-in logic to "choose" a payload to use in
-- building a higher-level feature
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testIODependency (IOAlways a f) = Right . uncurry PostPass
-- TODO this is wetter than Taco Bell shit
. bimap f (fmap stripMsg) <$> evalAlwaysMsg a
testIODependency (IOSometimes x f) =
bimap (fmap stripMsg) (uncurry PostPass . bimap f (fmap stripMsg))
<$> evalSometimesMsg x
stripMsg :: FMsg -> Msg
stripMsg (FMsg _ _ m) = m
--------------------------------------------------------------------------------
-- | Standalone dependency testing
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type Result_ = Either [Msg] [Msg]
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testTree_ :: (d -> FIO Result_) -> Tree_ d -> FIO Result_
testTree_ test = go
where
go (And_ a b) = either (return . Left) (`test2nd` b) =<< go a
go (Or_ a b) = either (`test2nd` b) (return . Right) =<< go a
go (Only_ a) = test a
test2nd ws = fmap ((Right . (ws ++)) =<<) . go
testIODependency_ :: IODependency_ -> FIO Result_
testIODependency_ = memoizeIO_ testIODependency'_
testIODependency'_ :: IODependency_ -> FIO Result_
testIODependency'_ (IOSystem_ _ s) = io $ readResult_ <$> testSysDependency s
testIODependency'_ (IOTest_ _ _ t) = io $ readResult_ <$> t
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testIODependency'_ (IOSometimes_ x) = bimap (fmap stripMsg) (fmap stripMsg . snd)
<$> evalSometimesMsg x
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--------------------------------------------------------------------------------
-- | System Dependency Testing
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testSysDependency :: SystemDependency -> IO (Maybe Msg)
testSysDependency (Executable sys bin) = maybe (Just msg) (const Nothing)
<$> findExecutable bin
where
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msg = Msg Error $ unwords [e, "executable", singleQuote bin, "not found"]
e = if sys then "system" else "local"
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testSysDependency (Systemd t n) = shellTest cmd msg
where
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msg = unwords ["systemd", unitType t, "unit", singleQuote n, "not found"]
cmd = fmtCmd "systemctl" $ ["--user" | t == UserUnit] ++ ["status", n]
testSysDependency (Process n) = shellTest (fmtCmd "pidof" [n])
$ "Process " ++ singleQuote n ++ " not found"
testSysDependency (AccessiblePath p r w) = permMsg <$> getPermissionsSafe p
where
testPerm False _ _ = Nothing
testPerm True f res = Just $ f res
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mkErr = Just . Msg Error
permMsg NotFoundError = mkErr "file not found"
permMsg PermError = mkErr "could not get permissions"
permMsg (PermResult res) =
case (testPerm r readable res, testPerm w writable res) of
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(Just False, Just False) -> mkErr "file not readable or writable"
(Just False, _) -> mkErr "file not readable"
(_, Just False) -> mkErr "file not writable"
_ -> Nothing
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shellTest :: String -> String -> IO (Maybe Msg)
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shellTest cmd msg = do
(rc, _, _) <- readCreateProcessWithExitCode' (shell cmd) ""
return $ case rc of
ExitSuccess -> Nothing
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_ -> Just $ Msg Error msg
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unitType :: UnitType -> String
unitType SystemUnit = "system"
unitType UserUnit = "user"
--------------------------------------------------------------------------------
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-- | Font testers
--
-- Make a special case for these since we end up testing the font alot, and it
-- would be nice if I can cache them.
fontAlways :: String -> String -> [Fulfillment] -> Always FontBuilder
fontAlways n fam ful = always1 n (fontFeatureName fam) root fallbackFont
where
root = IORoot id $ fontTree fam ful
fontSometimes :: String -> String -> [Fulfillment]-> Sometimes FontBuilder
fontSometimes n fam ful = sometimes1 n (fontFeatureName fam) root
where
root = IORoot id $ fontTree fam ful
fontFeatureName :: String -> String
fontFeatureName n = unwords ["Font family for", singleQuote n]
fontTreeAlt :: String -> [Fulfillment] -> Tree IODependency d_ FontBuilder
fontTreeAlt fam ful = Or (fontTree fam ful) $ Only $ IOConst fallbackFont
fontTree :: String -> [Fulfillment] -> Tree IODependency d_ FontBuilder
fontTree n = Only . fontDependency n
fontTree_ :: String -> [Fulfillment] -> IOTree_
fontTree_ n = Only_ . fontDependency_ n
fontDependency :: String -> [Fulfillment] -> IODependency FontBuilder
fontDependency fam ful = IORead (fontTestName fam) ful $ testFont fam
fontDependency_ :: String -> [Fulfillment] -> IODependency_
fontDependency_ fam ful = IOTest_ (fontTestName fam) ful $ voidRead <$> testFont' fam
fontTestName :: String -> String
fontTestName fam = unwords ["test if font", singleQuote fam, "exists"]
testFont :: String -> FIO (Result FontBuilder)
testFont = memoizeFont testFont'
testFont' :: String -> IO (Result FontBuilder)
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testFont' fam = maybe pass (Left . (:[])) <$> shellTest cmd msg
where
msg = unwords ["font family", qFam, "not found"]
cmd = fmtCmd "fc-list" ["-q", qFam]
qFam = singleQuote fam
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pass = Right $ PostPass (buildFont $ Just fam) []
--------------------------------------------------------------------------------
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-- | Network Testers
--
-- ASSUME that the system uses systemd in which case ethernet interfaces always
-- start with "en" and wireless interfaces always start with "wl"
readEthernet :: IODependency String
readEthernet = readInterface "get ethernet interface" isEthernet
readWireless :: IODependency String
readWireless = readInterface "get wireless interface" isWireless
isWireless :: String -> Bool
isWireless ('w':'l':_) = True
isWireless _ = False
isEthernet :: String -> Bool
isEthernet ('e':'n':_) = True
isEthernet _ = False
listInterfaces :: IO [String]
listInterfaces = fromRight [] <$> tryIOError (listDirectory sysfsNet)
sysfsNet :: FilePath
sysfsNet = "/sys/class/net"
-- ASSUME there are no (non-base) packages required to make these interfaces
-- work (all at the kernel level)
readInterface :: String -> (String -> Bool) -> IODependency String
readInterface n f = IORead n [] go
where
go = io $ do
ns <- filter f <$> listInterfaces
case ns of
[] -> return $ Left [Msg Error "no interfaces found"]
(x:xs) -> do
return $ Right $ PostPass x
$ fmap (Msg Warn . ("ignoring extra interface: " ++)) xs
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--------------------------------------------------------------------------------
-- | Misc testers
socketExists :: String -> [Fulfillment] -> IO FilePath -> IODependency_
socketExists n ful = IOTest_ ("test if " ++ n ++ " socket exists") ful
. socketExists'
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socketExists' :: IO FilePath -> IO (Maybe Msg)
socketExists' getPath = do
p <- getPath
r <- tryIOError $ getFileStatus p
return $ case r of
Left e -> toErr $ ioe_description e
Right s -> if isSocket s then Nothing else toErr $ p ++ " is not a socket"
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where
toErr = Just . Msg Error
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--------------------------------------------------------------------------------
-- | DBus Dependency Testing
introspectInterface :: InterfaceName
introspectInterface = interfaceName_ "org.freedesktop.DBus.Introspectable"
introspectMethod :: MemberName
introspectMethod = memberName_ "Introspect"
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testDBusDependency_ :: SafeClient c => c -> DBusDependency_ c -> FIO Result_
-- testDBusDependency_ cl = memoizeDBus_ (testDBusDependency'_ cl)
testDBusDependency_ = testDBusDependency'_
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testDBusDependency'_ :: SafeClient c => c -> DBusDependency_ c -> FIO Result_
testDBusDependency'_ cl (Bus _ bus) = io $ do
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ret <- callMethod cl queryBus queryPath queryIface queryMem
return $ case ret of
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Left e -> Left [Msg Error e]
Right b -> let ns = bodyGetNames b in
if bus' `elem` ns then Right []
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else Left [
Msg Error $ unwords ["name", singleQuote bus', "not found on dbus"]
]
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where
bus' = formatBusName bus
queryBus = busName_ "org.freedesktop.DBus"
queryIface = interfaceName_ "org.freedesktop.DBus"
queryPath = objectPath_ "/"
queryMem = memberName_ "ListNames"
bodyGetNames [v] = fromMaybe [] $ fromVariant v :: [String]
bodyGetNames _ = []
testDBusDependency'_ cl (Endpoint _ busname objpath iface mem) = io $ do
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ret <- callMethod cl busname objpath introspectInterface introspectMethod
return $ case ret of
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Left e -> Left [Msg Error e]
Right body -> procBody body
where
procBody body = let res = findMem =<< I.parseXML objpath =<< fromVariant
=<< listToMaybe body in
case res of
Just True -> Right []
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_ -> Left [Msg Error $ fmtMsg' mem]
findMem = fmap (matchMem mem)
. find (\i -> I.interfaceName i == iface)
. I.objectInterfaces
matchMem (Method_ n) = elemMember n I.methodName I.interfaceMethods
matchMem (Signal_ n) = elemMember n I.signalName I.interfaceSignals
matchMem (Property_ n) = elemMember n I.propertyName I.interfaceProperties
elemMember n fname fmember = elem n . fmap fname . fmember
fmtMem (Method_ n) = "method " ++ singleQuote (formatMemberName n)
fmtMem (Signal_ n) = "signal " ++ singleQuote (formatMemberName n)
fmtMem (Property_ n) = "property " ++ singleQuote n
fmtMsg' m = unwords
[ "could not find"
, fmtMem m
, "on interface"
, singleQuote $ formatInterfaceName iface
, "on bus"
, formatBusName busname
]
testDBusDependency'_ _ (DBusIO i) = testIODependency_ i
--------------------------------------------------------------------------------
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-- | IO Lifting functions
ioSometimes :: MonadIO m => Sometimes (IO a) -> Sometimes (m a)
ioSometimes (Sometimes n t xs) = Sometimes n t $ fmap ioSubfeature xs
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ioAlways :: MonadIO m => Always (IO a) -> Always (m a)
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ioAlways (Always n x) = Always n $ ioAlways' x
ioAlways' :: MonadIO m => Always_ (IO a) -> Always_ (m a)
ioAlways' (Always_ ar) = Always_ $ ioFallbackRoot ar
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ioAlways' (Option sf a) = Option (ioSubfeature sf) $ ioAlways' a
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ioFallbackRoot :: MonadIO m => FallbackRoot (IO a) -> FallbackRoot (m a)
ioFallbackRoot (FallbackAlone a) = FallbackAlone $ io a
ioFallbackRoot (FallbackTree a s) = FallbackTree (io . a) s
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ioSubfeature :: MonadIO m => SubfeatureRoot (IO a) -> SubfeatureRoot (m a)
ioSubfeature sf = sf { sfData = ioRoot $ sfData sf }
ioRoot :: MonadIO m => Root (IO a) -> Root (m a)
ioRoot (IORoot a t) = IORoot (io . a) t
ioRoot (IORoot_ a t) = IORoot_ (io a) t
ioRoot (DBusRoot a t cl) = DBusRoot (\p c -> io $ a p c) t cl
ioRoot (DBusRoot_ a t cl) = DBusRoot_ (io . a) t cl
--------------------------------------------------------------------------------
-- | Feature constructors
sometimes1_ :: XPQuery -> String -> String -> Root a -> Sometimes a
sometimes1_ x fn n t = Sometimes fn x
[Subfeature{ sfData = t, sfName = n }]
always1_ :: String -> String -> Root a -> a -> Always a
always1_ fn n t x = Always fn
$ Option (Subfeature{ sfData = t, sfName = n }) (Always_ $ FallbackAlone x)
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sometimes1 :: String -> String -> Root a -> Sometimes a
sometimes1 = sometimes1_ (const True)
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always1 :: String -> String -> Root a -> a -> Always a
always1 = always1_
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sometimesIO_ :: String -> String -> IOTree_ -> a -> Sometimes a
sometimesIO_ fn n t x = sometimes1 fn n $ IORoot_ x t
sometimesIO :: String -> String -> IOTree p -> (p -> a) -> Sometimes a
sometimesIO fn n t x = sometimes1 fn n $ IORoot x t
sometimesExe :: MonadIO m => String -> String -> [Fulfillment] -> Bool
-> FilePath -> Sometimes (m ())
sometimesExe fn n ful sys path = sometimesExeArgs fn n ful sys path []
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sometimesExeArgs :: MonadIO m => String -> String -> [Fulfillment] -> Bool
-> FilePath -> [String] -> Sometimes (m ())
sometimesExeArgs fn n ful sys path args =
sometimesIO_ fn n (Only_ (IOSystem_ ful $ Executable sys path)) $ spawnCmd path args
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sometimesDBus :: SafeClient c => Maybe c -> String -> String
-> Tree_ (DBusDependency_ c) -> (c -> a) -> Sometimes a
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sometimesDBus c fn n t x = sometimes1 fn n $ DBusRoot_ x t c
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sometimesEndpoint :: (SafeClient c, MonadIO m) => String -> String
-> [Fulfillment] -> BusName -> ObjectPath -> InterfaceName -> MemberName
-> Maybe c -> Sometimes (m ())
sometimesEndpoint fn name ful busname path iface mem cl =
sometimesDBus cl fn name deps cmd
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where
deps = Only_ $ Endpoint ful busname path iface $ Method_ mem
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cmd c = io $ void $ callMethod c busname path iface mem
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--------------------------------------------------------------------------------
-- | Dependency Tree Constructors
listToAnds :: d -> [d] -> Tree_ d
listToAnds i = foldr (And_ . Only_) (Only_ i)
toAnd_ :: d -> d -> Tree_ d
toAnd_ a b = And_ (Only_ a) (Only_ b)
toFallback :: IODependency p -> p -> Tree IODependency d_ p
toFallback a = Or (Only a) . Only . IOConst
voidResult :: Result p -> Result_
voidResult (Left es) = Left es
voidResult (Right (PostPass _ ws)) = Right ws
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voidRead :: Result p -> Maybe Msg
voidRead (Left []) = Just $ Msg Error "unspecified error"
voidRead (Left (e:_)) = Just e
voidRead (Right _) = Nothing
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readResult_ :: Maybe Msg -> Result_
readResult_ (Just w) = Left [w]
readResult_ _ = Right []
--------------------------------------------------------------------------------
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-- | IO Dependency Constructors
exe :: Bool -> [Fulfillment] -> String -> IODependency_
exe b ful = IOSystem_ ful . Executable b
sysExe :: [Fulfillment] -> String -> IODependency_
sysExe = exe True
localExe :: [Fulfillment] -> String -> IODependency_
localExe = exe False
path' :: Bool -> Bool -> String -> [Fulfillment] -> IODependency_
path' r w n ful = IOSystem_ ful $ AccessiblePath n r w
pathR :: String -> [Fulfillment] -> IODependency_
pathR = path' True False
pathW :: String -> [Fulfillment] -> IODependency_
pathW = path' False True
pathRW :: String -> [Fulfillment] -> IODependency_
pathRW = path' True True
sysd :: UnitType -> [Fulfillment] -> String -> IODependency_
sysd u ful = IOSystem_ ful . Systemd u
sysdUser :: [Fulfillment] -> String -> IODependency_
sysdUser = sysd UserUnit
sysdSystem :: [Fulfillment] -> String -> IODependency_
sysdSystem = sysd SystemUnit
process :: [Fulfillment] -> String -> IODependency_
process ful = IOSystem_ ful . Process
--------------------------------------------------------------------------------
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-- | Printing
dumpSubfeatureRoot :: SubfeatureRoot a -> FIO (JSONUnquotable, Bool)
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dumpSubfeatureRoot Subfeature { sfData = r, sfName = n } =
first (jsonSubfeature $ Q n) <$> dumpRoot r
dumpRoot :: Root a -> FIO (JSONUnquotable, Bool)
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dumpRoot (IORoot _ t) = first jsonIORoot <$>
dumpTree testIODependency testIODependency_ dataIODependency dataIODependency_ t
dumpRoot (IORoot_ _ t) = first jsonIORoot <$>
dumpTree_ testIODependency_ dataIODependency_ t
dumpRoot (DBusRoot _ t (Just cl)) = first jsonDBusRoot <$>
dumpTree testIODependency (testDBusDependency_ cl) dataIODependency dataDBusDependency t
dumpRoot (DBusRoot_ _ t (Just cl)) = first jsonDBusRoot <$>
dumpTree_ (testDBusDependency_ cl) dataDBusDependency t
-- TODO somehow return a message here that these failed
dumpRoot (DBusRoot _ t Nothing) =
return (jsonDBusRoot $ dataTree dataIODependency dataDBusDependency t, False)
dumpRoot (DBusRoot_ _ t Nothing) =
return (jsonDBusRoot $ dataTree_ dataDBusDependency t, False)
dumpTree :: forall d d_ p. (forall q. d q -> FIO (Result q))
-> (d_ -> FIO Result_) -> (forall q. d q -> DependencyData)
-> (d_ -> DependencyData) -> Tree d d_ p -> FIO (JSONUnquotable, Bool)
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dumpTree test test_ dd dd_ = go
where
go :: forall q. Tree d d_ q -> FIO (JSONUnquotable, Bool)
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go (And12 _ a b) = doAnd go go data' a b
go (And1 a b) = doAnd go dump_' (dataTree_ dd_) a b
go (And2 a b) = doAnd dump_' go data' a b
go (Or a b) = do
(sa, ra) <- go a
let j = jsonOr sa
if ra then return (j $ data' b, ra) else first j <$> go b
go (Only d) = do
r <- fromResult <$> test d
let (x, y) = dd d
return (jsonLeaf (Just r) x y, fst r)
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data' :: forall q. Tree d d_ q -> JSONUnquotable
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data' = dataTree dd dd_
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dump_' = dumpTree_ test_ dd_
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doAnd fa fb fb_ a b = do
(sa, ra) <- fa a
let j = jsonAnd sa
if ra then first j <$> fb b else return (j $ fb_ b, ra)
dumpTree_ :: (d_ -> FIO Result_) -> (d_ -> DependencyData) -> Tree_ d_
-> FIO (JSONUnquotable, Bool)
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dumpTree_ test_ dd_ = go
where
go (And_ a b) = do
(sa, ra) <- go a
let j = jsonAnd sa
if ra then first j <$> go b else return (j $ dataTree_ dd_ b, ra)
go (Or_ a b) = do
(sa, ra) <- go a
let j = jsonAnd sa
if ra then return (j $ dataTree_ dd_ b, ra) else first j <$> go b
go (Only_ d) = do
r <- fromResult_ <$> test_ d
let (x, y) = dd_ d
return (jsonLeaf (Just r) x y, fst r)
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--------------------------------------------------------------------------------
-- | Dependency data for JSON
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type DependencyData = (JSONQuotable, [(String, JSONMixed)])
dataSubfeatureRoot :: SubfeatureRoot a -> JSONUnquotable
dataSubfeatureRoot Subfeature { sfData = r, sfName = n } =
jsonSubfeature (Q n) $ dataRoot r
dataRoot :: Root a -> JSONUnquotable
dataRoot (IORoot _ t) = dataTree dataIODependency dataIODependency_ t
dataRoot (IORoot_ _ t) = dataTree_ dataIODependency_ t
dataRoot (DBusRoot _ t _) = dataTree dataIODependency dataDBusDependency t
dataRoot (DBusRoot_ _ t _) = dataTree_ dataDBusDependency t
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dataTree :: forall d d_ p. (forall q. d q -> DependencyData)
-> (d_ -> DependencyData) -> Tree d d_ p -> JSONUnquotable
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dataTree f f_ = go
where
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go :: forall q. Tree d d_ q -> JSONUnquotable
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go (And12 _ a b) = jsonAnd (go a) (go b)
go (And1 a b) = jsonAnd (go a) (dataTree_ f_ b)
go (And2 a b) = jsonAnd (dataTree_ f_ a) (go b)
go (Or a b) = jsonOr (go a) (go b)
go (Only d) = uncurry jsonLeafUntested $ f d
dataTree_ :: (d_ -> DependencyData) -> Tree_ d_ -> JSONUnquotable
dataTree_ f_ = go
where
go (And_ a b) = jsonAnd (go a) (go b)
go (Or_ a b) = jsonOr (go a) (go b)
go (Only_ d) = uncurry jsonLeafUntested $ f_ d
dataIODependency :: IODependency p -> DependencyData
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dataIODependency d = first Q $ case d of
(IORead n f _) -> ("ioread", [ ("desc", JSON_Q $ Q n)
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, ("fulfillment", JSON_UQ
$ dataFulfillments f)
])
(IOConst _) -> ("const", [])
-- TODO what if this isn't required?
(IOSometimes (Sometimes n _ _) _) -> ("sometimes", [ ("name", JSON_Q $ Q n)])
(IOAlways (Always n _) _) -> ("always", [("name", JSON_Q $ Q n)])
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dataIODependency_ :: IODependency_ -> DependencyData
dataIODependency_ d = case d of
(IOSystem_ f s) -> dataSysDependency f s
(IOSometimes_ _) -> (Q "sometimes", [])
(IOTest_ desc f _) -> (Q "iotest", [ ("desc", JSON_Q $ Q desc)
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, ("fulfillment", JSON_UQ $ dataFulfillments f)
])
dataSysDependency :: [Fulfillment] -> SystemDependency -> DependencyData
dataSysDependency f d = first Q $
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case d of
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(Executable sys path) -> ("executable", [ ("system", JSON_UQ $ jsonBool sys)
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, ("path", JSON_Q $ Q path)
, f'
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])
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(AccessiblePath p r w) -> ("path", [ ("path", JSON_Q $ Q p)
, ("readable", JSON_UQ $ jsonBool r)
, ("writable", JSON_UQ $ jsonBool w)
, f'
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])
(Systemd t n) -> ("systemd", [ ("unittype", JSON_Q $ Q $ unitType t)
, ("unit", JSON_Q $ Q n)
, f'
])
(Process n) -> ("process", [("name", JSON_Q $ Q n), f'])
where
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f' = ("fulfillment", JSON_UQ $ dataFulfillments f)
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dataDBusDependency :: DBusDependency_ c -> DependencyData
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dataDBusDependency d =
case d of
(DBusIO i) -> dataIODependency_ i
(Bus f b) -> (Q "bus", [ ("busname", JSON_Q $ Q $ formatBusName b)
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, ("fulfillment", JSON_UQ $ dataFulfillments f)
])
(Endpoint f b o i m) -> let (mt, mn) = memberData m
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in (Q "endpoint", [ ("busname", JSON_Q $ Q $ formatBusName b)
, ("objectpath", JSON_Q $ Q $ formatObjectPath o)
, ("interface", JSON_Q $ Q $ formatInterfaceName i)
, ("membertype", JSON_Q $ Q mt)
, ("membername", JSON_Q $ Q mn)
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, ("fulfillment", JSON_UQ $ dataFulfillments f)
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])
where
memberData (Method_ n) = ("method", formatMemberName n)
memberData (Signal_ n) = ("signal", formatMemberName n)
memberData (Property_ n) = ("property", n)
dataFulfillments :: [Fulfillment] -> JSONUnquotable
dataFulfillments = jsonArray . fmap (JSON_UQ . dataFulfillment)
dataFulfillment :: Fulfillment -> JSONUnquotable
dataFulfillment (Package a n) = jsonObject [ ("type", JSON_Q $ Q "package")
, ("type", JSON_Q $ Q $ show a)
, ("name", JSON_Q $ Q n)
]
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fromMsg :: Msg -> JSONUnquotable
fromMsg (Msg e s) = jsonObject [ ("level", JSON_Q $ Q $ show e)
, ("msg", JSON_Q $ Q s)
]
fromResult :: Result a -> (Bool, [JSONUnquotable])
fromResult = second (fmap fromMsg) . either (False,) (\(PostPass _ ws) -> (True, ws))
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fromResult_ :: Result_ -> (Bool, [JSONUnquotable])
fromResult_ = second (fmap fromMsg) . either (False,) (True,)
--------------------------------------------------------------------------------
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-- | JSON formatting
--
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-- I could use Aeson...but I don't feel like it (too many intermediate types)
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newtype JSONQuotable = Q String
newtype JSONUnquotable = UQ String
data JSONMixed = JSON_UQ JSONUnquotable | JSON_Q JSONQuotable
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jsonAlways :: JSONQuotable -> Maybe JSONUnquotable -> [JSONUnquotable]
-> [JSONUnquotable] -> JSONUnquotable
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jsonAlways = jsonFeature True
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jsonSometimes :: JSONQuotable -> Maybe JSONUnquotable -> [JSONUnquotable]
-> [JSONUnquotable] -> JSONUnquotable
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jsonSometimes = jsonFeature False
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jsonFeature :: Bool -> JSONQuotable -> Maybe JSONUnquotable -> [JSONUnquotable]
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-> [JSONUnquotable] -> JSONUnquotable
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jsonFeature isalways name success failed untested = jsonObject
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[ ("type", JSON_Q $ Q $ if isalways then "always" else "sometimes")
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, ("name", JSON_Q name)
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, ("success", JSON_UQ $ fromMaybe (UQ "null") success)
, ("failed", JSON_UQ $ jsonArray $ fmap JSON_UQ failed)
, ("untested", JSON_UQ $ jsonArray $ fmap JSON_UQ untested)
]
jsonSubfeature :: JSONQuotable -> JSONUnquotable -> JSONUnquotable
jsonSubfeature n r = jsonObject
[ ("name", JSON_Q n)
, ("root", JSON_UQ r)
]
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jsonIORoot :: JSONUnquotable -> JSONUnquotable
jsonIORoot = jsonRoot True
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jsonDBusRoot :: JSONUnquotable -> JSONUnquotable
jsonDBusRoot = jsonRoot False
jsonRoot :: Bool -> JSONUnquotable -> JSONUnquotable
jsonRoot isIO tree = jsonObject
[ ("type", JSON_Q $ Q $ if isIO then "io" else "dbus")
, ("tree", JSON_UQ tree)
]
jsonLeafUntested :: JSONQuotable -> [(String, JSONMixed)] -> JSONUnquotable
jsonLeafUntested = jsonLeaf Nothing
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jsonLeaf :: Maybe (Bool, [JSONUnquotable]) -> JSONQuotable -> [(String, JSONMixed)]
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-> JSONUnquotable
jsonLeaf status deptype depdata = jsonObject
[ ("type", JSON_Q deptype)
, ("status", jsonMaybe (JSON_UQ . uncurry jsonStatus) status)
, ("data", JSON_UQ $ jsonObject depdata)
]
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jsonStatus :: Bool -> [JSONUnquotable] -> JSONUnquotable
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jsonStatus present messages = jsonObject
[ ("present", JSON_UQ $ jsonBool present)
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, ("messages", JSON_UQ $ jsonArray $ fmap JSON_UQ messages)
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]
jsonAnd :: JSONUnquotable -> JSONUnquotable -> JSONUnquotable
jsonAnd = jsonBranch True
jsonOr :: JSONUnquotable -> JSONUnquotable -> JSONUnquotable
jsonOr = jsonBranch False
jsonBranch :: Bool -> JSONUnquotable -> JSONUnquotable -> JSONUnquotable
jsonBranch isAnd l r = jsonObject
[ ("test", JSON_Q $ Q $ if isAnd then "and" else "or")
, ("left", JSON_UQ l)
, ("right",JSON_UQ r)
]
jsonMaybe :: (a -> JSONMixed) -> Maybe a -> JSONMixed
jsonMaybe = maybe (JSON_UQ $ UQ "null")
jsonBool :: Bool -> JSONUnquotable
jsonBool True = UQ "true"
jsonBool False = UQ "false"
jsonArray :: [JSONMixed] -> JSONUnquotable
jsonArray = UQ . bracket . intercalate "," . fmap quoteMaybe
jsonObject :: [(String, JSONMixed)] -> JSONUnquotable
jsonObject = UQ . curly . intercalate ","
. fmap (\(k, v) -> doubleQuote k ++ ":" ++ quoteMaybe v)
quoteMaybe :: JSONMixed -> String
quoteMaybe (JSON_Q (Q s)) = doubleQuote s
quoteMaybe (JSON_UQ (UQ s)) = s
bracket :: String -> String
bracket s = "[" ++ s ++ "]"
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curly :: String -> String
curly s = "{" ++ s ++ "}"