Moved LK fn as Txn impl. Resolves #41.

src/import_cost_proceeds_etc.rs

@@ -393,19 +393,13 @@ fn perform_likekind_treatment_on_txn(
 
     let txn = txns_map.get(&txn_num).unwrap();
     let tx_type = txn.transaction_type(ars, raw_acct_map, acct_map)?;
+    let home_currency = &settings.home_currency;
 
     match tx_type {
 
         TxType::Exchange => {
 
-            let og_ar = ars.get(&txn.action_record_idx_vec.first().unwrap()).unwrap();
+            if txn.both_exch_ars_are_non_home_curr(ars, raw_acct_map, acct_map, home_currency)? {
-            let ic_ar = ars.get(&txn.action_record_idx_vec.last().unwrap()).unwrap();
-            let og_acct = acct_map.get(&og_ar.account_key).unwrap();
-            let ic_acct = acct_map.get(&ic_ar.account_key).unwrap();
-            let raw_og_acct = raw_acct_map.get(&og_acct.raw_key).unwrap();
-            let raw_ic_acct = raw_acct_map.get(&ic_acct.raw_key).unwrap();
-
-            if _both_are_non_home_curr(raw_og_acct, raw_ic_acct, settings) {
 
                 let mut sum_of_outgoing_lk_cost_basis_in_ar = d128!(0);
 
@@ -487,18 +481,5 @@ fn perform_likekind_treatment_on_txn(
         }
     }
 
-    fn _both_are_non_home_curr(
-        raw_og_acct: &RawAccount,
-        raw_ic_acct: &RawAccount,
-        settings: &ImportProcessParameters
-    ) -> bool {
-
-        let og_is_home_curr = raw_og_acct.is_home_currency(&settings.home_currency);
-        let ic_is_home_curr = raw_ic_acct.is_home_currency(&settings.home_currency);
-        let both_are_non_home_curr = !ic_is_home_curr && !og_is_home_curr;
-
-        both_are_non_home_curr
-    }
-
     Ok(())
 }

src/transaction.rs

@@ -185,6 +185,30 @@ impl Transaction {
         }
 		Ok(flow_or_outgoing_exchange_movements)
 	}
+
+    pub fn both_exch_ars_are_non_home_curr(
+        &self,
+        ars: &HashMap<u32, ActionRecord>,
+        raw_acct_map: &HashMap<u16, RawAccount>,
+        acct_map: &HashMap<u16, Account>,
+        home_currency: &String,
+    ) -> Result<bool, Box<dyn Error>> {
+
+        assert_eq!(self.action_record_idx_vec.len(), (2 as usize));
+
+        let og_ar = ars.get(&self.action_record_idx_vec.first().unwrap()).unwrap();
+        let ic_ar = ars.get(&self.action_record_idx_vec.last().unwrap()).unwrap();
+        let og_acct = acct_map.get(&og_ar.account_key).unwrap();
+        let ic_acct = acct_map.get(&ic_ar.account_key).unwrap();
+        let raw_og_acct = raw_acct_map.get(&og_acct.raw_key).unwrap();
+        let raw_ic_acct = raw_acct_map.get(&ic_acct.raw_key).unwrap();
+
+        let og_is_home_curr = raw_og_acct.is_home_currency(&home_currency);
+        let ic_is_home_curr = raw_ic_acct.is_home_currency(&home_currency);
+        let both_are_non_home_curr = !ic_is_home_curr && !og_is_home_curr;
+
+        Ok(both_are_non_home_curr)
+    }
 }
 
 #[derive(Clone, Debug)]