chore: refine names, add mappedTo in TransferPartRecord

contract/src/offer-up.contract.js

@@ -109,8 +109,8 @@ export const start = async zcf => {
     const newItems = itemMint.mintGains(want);
     const charge = { Price: tradePrice };
     atomicRearrange(zcf, [
-      { fromSeat: buyerSeat, toSeat: proceeds, fromAmounts: charge },
-      { fromSeat: newItems, toSeat: buyerSeat, fromAmounts: want },
+      { from: buyerSeat, to: proceeds, amounts: charge },
+      { from: newItems, to: buyerSeat, amounts: want },
     ]);
 
     buyerSeat.exit(true);

contract/src/platform-goals/zcfTools.js

@@ -1,5 +1,6 @@
 // @ts-check
 import { atomicRearrange as atomicRearrangeTuples } from '@agoric/zoe/src/contractSupport/atomicTransfer.js';
+import { mapKeywords } from '@agoric/zoe/src/contractSupport/zoeHelpers.js';
 
 /** @typedef {import("@agoric/zoe/src/contractSupport/atomicTransfer").TransferPart} TransferPart */
 
@@ -10,20 +11,24 @@ import { atomicRearrange as atomicRearrangeTuples } from '@agoric/zoe/src/contra
  * @param { Array<TransferPartRecord | TransferPart>} transferParts
  *
  * @typedef {{
- *   fromSeat?: ZCFSeat,
- *   toSeat?: ZCFSeat,
- *   fromAmounts?: AmountKeywordRecord,
- *   toAmounts?: AmountKeywordRecord
+ *   from?: ZCFSeat,
+ *   to?: ZCFSeat,
+ *   amounts?: AmountKeywordRecord,
+ *   mappedTo?: KeywordKeywordRecord
  * }} TransferPartRecord
  */
 export const atomicRearrange = (zcf, transferParts) => {
   /** @type {TransferPart[]} */
   const tuples = harden(
-    transferParts.map(part =>
-      Array.isArray(part)
-        ? part
-        : [part.fromSeat, part.toSeat, part.fromAmounts, part.toAmounts],
-    ),
+    transferParts.map(part => {
+      if (Array.isArray(part)) {
+        return part;
+      }
+      const toAmounts = part.mappedTo
+        ? mapKeywords(part.amounts, part.mappedTo)
+        : undefined;
+      return [part.from, part.to, part.amounts, toAmounts];
+    }),
   );
   return atomicRearrangeTuples(zcf, tuples);
 };