lib: showAmountCost(B): drop leading whitespace

hledger-lib/Hledger/Data/Amount.hs

@@ -673,22 +673,22 @@ showAmountB
     space = if not (T.null comm) && ascommodityspaced style then WideBuilder (TB.singleton ' ') 1 else mempty
     cost = if displayCost then showAmountCostB afmt a else mempty
 
--- Show an amount's cost as @ UNITCOST or @@ TOTALCOST.
+-- Show an amount's cost as @ UNITCOST or @@ TOTALCOST, plus a leading space, or "" if there's no cost.
 showAmountCost :: Amount -> String
 showAmountCost = wbUnpack . showAmountCostB defaultFmt
 
--- Show an amount's cost as @ UNITCOST or @@ TOTALCOST (builder version).
+-- showAmountCost, efficient builder version.
 showAmountCostB :: AmountFormat -> Amount -> WideBuilder
 showAmountCostB afmt amt = case acost amt of
-  Nothing              -> mempty
+  Nothing             -> mempty
   Just (UnitCost  pa) -> WideBuilder (TB.fromString " @ ")  3 <> showAmountB afmt pa
   Just (TotalCost pa) -> WideBuilder (TB.fromString " @@ ") 4 <> showAmountB afmt (sign pa)
   where sign = if aquantity amt < 0 then negate else id
 
 showAmountCostDebug :: Maybe AmountCost -> String
 showAmountCostDebug Nothing                = ""
-showAmountCostDebug (Just (UnitCost pa))  = " @ "  ++ showAmountDebug pa
-showAmountCostDebug (Just (TotalCost pa)) = " @@ " ++ showAmountDebug pa
+showAmountCostDebug (Just (UnitCost pa))  = "@ "  ++ showAmountDebug pa
+showAmountCostDebug (Just (TotalCost pa)) = "@@ " ++ showAmountDebug pa
 
 -- | Colour version. For a negative amount, adds ANSI codes to change the colour,
 -- currently to hard-coded red.

hledger-lib/Hledger/Data/Journal.hs

@@ -1176,9 +1176,9 @@ pivotComponent fieldortagname p
   | fieldortagname == "note",        Just t <- ptransaction p = transactionNote t
   | fieldortagname == "status",      Just t <- ptransaction p = T.pack . show . tstatus $ t
   | fieldortagname == "acct"        = paccount p
-  | fieldortagname `elem` commnames = case map acommodity $ amounts $ pamount p of [s] -> s;                             _ -> unknown
-  | fieldortagname == "amt"         = case amounts $ pamount p of [a] -> T.pack $ show $ aquantity a;                    _ -> unknown
-  | fieldortagname == "cost"        = case amounts $ pamount p of [a@Amount{acost=Just _}] -> T.pack $ showAmountCost a; _ -> unknown
+  | fieldortagname `elem` commnames = case map acommodity $ amounts $ pamount p of [s] -> s; _ -> unknown
+  | fieldortagname == "amt"         = case amounts $ pamount p of [a] -> T.pack $ show $ aquantity a; _ -> unknown
+  | fieldortagname == "cost"        = case amounts $ pamount p of [a@Amount{acost=Just _}] -> T.pack $ lstrip $ showAmountCost a; _ -> unknown
   | Just (_, tagvalue) <- postingFindTag fieldortagname p = tagvalue
   | otherwise = unknown
   where

hledger/test/pivot.test

@@ -200,10 +200,10 @@ Balance changes in 2025:
 $ hledger -f- bal -Y --pivot=cost
 Balance changes in 2025:
 
-         ||            2025 
-=========++=================
-         ||           $-210 
-  @ $10  ||             1 A 
-  @ $100 ||             2 B 
----------++-----------------
-         || $-210, 1 A, 2 B 
+        ||            2025 
+========++=================
+        ||           $-210 
+ @ $10  ||             1 A 
+ @ $100 ||             2 B 
+--------++-----------------
+        || $-210, 1 A, 2 B