dev: save the parse positions of PriceDirectives

hledger-lib/Hledger/Data/Types.hs

@@ -552,7 +552,8 @@ data TimeclockEntry = TimeclockEntry {
 -- It declares two things: a historical exchange rate between two commodities,
 -- and an amount display style for the second commodity.
 data PriceDirective = PriceDirective {
-   pddate      :: Day
+   pdsourcepos :: SourcePos
+  ,pddate      :: Day
   ,pdcommodity :: CommoditySymbol
   ,pdamount    :: Amount
   } deriving (Eq,Ord,Generic,Show)

hledger-lib/Hledger/Data/Valuation.hs

@@ -119,7 +119,7 @@ amountPriceDirectiveFromCost d amt@Amount{acommodity=fromcomm, aquantity=n} = ca
       where u = amountSetFullPrecisionUpTo Nothing $ divideAmount n t
     _                            -> Nothing
   where
-    pd = PriceDirective{pddate = d, pdcommodity = fromcomm, pdamount = nullamt}
+    pd = PriceDirective{pdsourcepos=nullsourcepos, pddate=d, pdcommodity=fromcomm, pdamount=nullamt}
 
 ------------------------------------------------------------------------------
 -- Converting things to value

hledger-lib/Hledger/Read/JournalReader.hs

@@ -671,6 +671,7 @@ defaultcommoditydirectivep = do
 
 marketpricedirectivep :: JournalParser m PriceDirective
 marketpricedirectivep = do
+  pos <- getSourcePos
   char 'P' <?> "market price"
   lift skipNonNewlineSpaces
   date <- try (do {LocalTime d _ <- datetimep; return d}) <|> datep -- a time is ignored
@@ -679,7 +680,7 @@ marketpricedirectivep = do
   lift skipNonNewlineSpaces
   price <- amountp
   lift restofline
-  return $ PriceDirective date symbol price
+  return $ PriceDirective pos date symbol price
 
 ignoredpricecommoditydirectivep :: JournalParser m ()
 ignoredpricecommoditydirectivep = do
@@ -1145,6 +1146,7 @@ tests_JournalReader = testGroup "JournalReader" [
   ,testCase "marketpricedirectivep" $ assertParseEq marketpricedirectivep
     "P 2017/01/30 BTC $922.83\n"
     PriceDirective{
+      pdsourcepos = nullsourcepos,
       pddate      = fromGregorian 2017 1 30,
       pdcommodity = "BTC",
       pdamount    = usd 922.83