cln: Derive more instances in Hledger.Data.Types to reduce orphans.

Also clean up some outdated or inaccurate comments.

hledger-lib/Hledger/Data/Amount.hs

@@ -43,7 +43,6 @@ exchange rates.
 {-# LANGUAGE BangPatterns       #-}
 {-# LANGUAGE OverloadedStrings  #-}
 {-# LANGUAGE RecordWildCards    #-}
-{-# LANGUAGE StandaloneDeriving #-}
 
 module Hledger.Data.Amount (
   -- * Amount
@@ -166,8 +165,6 @@ import Hledger.Data.Types
 import Hledger.Data.Commodity
 import Hledger.Utils
 
-deriving instance Show MarketPrice
-
 
 -- | Options for the display of Amount and MixedAmount.
 data AmountDisplayOpts = AmountDisplayOpts

hledger-lib/Hledger/Data/Journal.hs

@@ -107,7 +107,7 @@ import Data.Foldable (toList)
 import Data.Function ((&))
 import qualified Data.HashTable.Class as H (toList)
 import qualified Data.HashTable.ST.Cuckoo as H
-import Data.List ((\\), find, foldl', sortOn)
+import Data.List ((\\), find, foldl', sortBy, sortOn)
 import Data.List.Extra (nubSort)
 import qualified Data.Map.Strict as M
 import Data.Maybe (catMaybes, fromJust, fromMaybe, isJust, mapMaybe, maybeToList)
@@ -129,14 +129,9 @@ import Hledger.Data.Transaction
 import Hledger.Data.TransactionModifier
 import Hledger.Data.Posting
 import Hledger.Query
-import Data.List (sortBy)
 
 
--- try to make Journal ppShow-compatible
--- instance Show ClockTime where
---   show t = "<ClockTime>"
 -- deriving instance Show Journal
-
 instance Show Journal where
   show j
     | debugLevel < 3 = printf "Journal %s with %d transactions, %d accounts"

hledger-lib/Hledger/Data/Json.hs

@@ -2,28 +2,10 @@
 JSON instances. Should they be in Types.hs ?
 -}
 
-{-# OPTIONS_GHC -fno-warn-orphans #-}
-
---{-# LANGUAGE DataKinds           #-}
---{-# LANGUAGE DeriveAnyClass      #-}
-{-# LANGUAGE DeriveGeneric       #-}
---{-# LANGUAGE FlexibleContexts #-}
 {-# LANGUAGE FlexibleInstances #-}
 {-# LANGUAGE LambdaCase        #-}
---{-# LANGUAGE NamedFieldPuns #-}
---{-# LANGUAGE OverloadedStrings   #-}
 {-# LANGUAGE OverloadedStrings #-}
---{-# LANGUAGE PolyKinds           #-}
---{-# LANGUAGE QuasiQuotes         #-}
---{-# LANGUAGE QuasiQuotes #-}
---{-# LANGUAGE Rank2Types #-}
---{-# LANGUAGE RankNTypes #-}
 {-# LANGUAGE RecordWildCards   #-}
---{-# LANGUAGE ScopedTypeVariables #-}
-{-# LANGUAGE StandaloneDeriving #-}
---{-# LANGUAGE TemplateHaskell       #-}
---{-# LANGUAGE TypeFamilies        #-}
---{-# LANGUAGE TypeOperators       #-}
 
 module Hledger.Data.Json (
   -- * Instances
@@ -42,7 +24,6 @@ import           Data.Decimal (DecimalRaw(..), roundTo)
 import           Data.Maybe (fromMaybe)
 import qualified Data.Text.Lazy    as TL
 import qualified Data.Text.Lazy.Builder as TB
-import           GHC.Generics (Generic)
 
 import           Hledger.Data.Types
 import           Hledger.Data.Amount (amountsRaw, mixed)
@@ -172,7 +153,6 @@ accountKV a =
     , "asubs"        .= ([]::[Account])
     ]
 
-deriving instance Generic (Ledger)
 instance ToJSON Ledger
 
 -- From JSON
@@ -216,9 +196,6 @@ instance FromJSON Account
 -- $(deriveFromJSON defaultOptions ''DecimalRaw)  -- works; requires TH, but gives better parse error messages
 --
 -- https://github.com/PaulJohnson/Haskell-Decimal/issues/6
---deriving instance Generic Decimal
---instance FromJSON Decimal
-deriving instance Generic (DecimalRaw a)
 instance FromJSON (DecimalRaw Integer)
 --
 -- @simonmichael, I think the code in your first comment should work if it compiles—though “work” doesn’t mean you can parse a JSON number directly into a `Decimal` using the generic instance, as you’ve discovered.

hledger-lib/Hledger/Data/Types.hs

@@ -27,7 +27,7 @@ module Hledger.Data.Types
 where
 
 import GHC.Generics (Generic)
-import Data.Decimal (Decimal)
+import Data.Decimal (Decimal, DecimalRaw(..))
 import Data.Default (Default(..))
 import Data.Functor (($>))
 import Data.List (intercalate)
@@ -172,6 +172,7 @@ type Quantity = Decimal
 instance ToMarkup Quantity
  where
    toMarkup = toMarkup . show
+deriving instance Generic (DecimalRaw a)
 
 -- | An amount's per-unit or total cost/selling price in another
 -- commodity, as recorded in the journal entry eg with @ or @@.
@@ -390,10 +391,6 @@ data GenericSourcePos = GenericSourcePos FilePath Int Int    -- ^ file path, 1-b
                       | JournalSourcePos FilePath (Int, Int) -- ^ file path, inclusive range of 1-based line numbers (first, last).
   deriving (Eq, Read, Show, Ord, Generic)
 
---{-# ANN Transaction "HLint: ignore" #-}
---    Ambiguous type variable ‘p0’ arising from an annotation
---    prevents the constraint ‘(Data p0)’ from being solved.
---    Probable fix: use a type annotation to specify what ‘p0’ should be.
 data Transaction = Transaction {
       tindex                   :: Integer,   -- ^ this transaction's 1-based position in the transaction stream, or 0 when not available
       tprecedingcomment        :: Text,      -- ^ any comment lines immediately preceding this transaction
@@ -425,7 +422,7 @@ nulltransactionmodifier = TransactionModifier{
 
 -- | A transaction modifier transformation, which adds an extra posting
 -- to the matched posting's transaction.
--- Can be like a regular posting, or the amount can have the aismultiplier flag set,
+-- Can be like a regular posting, or can have the tmprIsMultiplier flag set,
 -- indicating that it's a multiplier for the matched posting's amount.
 data TMPostingRule = TMPostingRule
   { tmprPosting :: Posting
@@ -476,7 +473,6 @@ data PriceDirective = PriceDirective {
   ,pdcommodity :: CommoditySymbol
   ,pdamount    :: Amount
   } deriving (Eq,Ord,Generic,Show)
-        -- Show instance derived in Amount.hs (XXX why ?)
 
 -- | A historical market price (exchange rate) from one commodity to another.
 -- A more concise form of a PriceDirective, without the amount display info.
@@ -485,8 +481,7 @@ data MarketPrice = MarketPrice {
   ,mpfrom :: CommoditySymbol    -- ^ The commodity being converted from.
   ,mpto   :: CommoditySymbol    -- ^ The commodity being converted to.
   ,mprate :: Quantity           -- ^ One unit of the "from" commodity is worth this quantity of the "to" commodity.
-  } deriving (Eq,Ord,Generic)
-        -- Show instance derived in Amount.hs (XXX why ?)
+  } deriving (Eq,Ord,Generic, Show)
 
 -- additional valuation-related types in Valuation.hs
 
@@ -592,7 +587,6 @@ data NormalSign = NormallyPositive | NormallyNegative deriving (Show, Eq)
 -- tree-wise, since each one knows its parent and subs; the first
 -- account is the root of the tree and always exists.
 data Ledger = Ledger {
-  ljournal  :: Journal,
-  laccounts :: [Account]
-}
-
+   ljournal  :: Journal
+  ,laccounts :: [Account]
+  } deriving (Generic)