Refactor #2: Money out

I refactored money out, namely:

1. Made naming more consistent (e.g. "debt" to "amount" for numerical
   quantitiest that are not a Debt object).
2. Added a utility for automatically setting the right types when
   reading a model from CSV.
3. Simplified message formatting.
4. Added a constant for decimal precision.

My editor automatically formatted everything with Black, I'm not sure
if we are ok with that, let me know and I can figure out how to disable
that.

oldabe/constants.py

@@ -1,18 +1,22 @@
 import os
 
-ABE_ROOT = './abe'
-PAYOUTS_DIR = os.path.join(ABE_ROOT, 'payouts')
-PAYMENTS_DIR = os.path.join(ABE_ROOT, 'payments')
+ABE_ROOT = "./abe"
+PAYOUTS_DIR = os.path.join(ABE_ROOT, "payouts")
+PAYMENTS_DIR = os.path.join(ABE_ROOT, "payments")
 NONATTRIBUTABLE_PAYMENTS_DIR = os.path.join(
-    ABE_ROOT, 'payments', 'nonattributable'
+    ABE_ROOT, "payments", "nonattributable"
 )
 
-TRANSACTIONS_FILE = os.path.join(ABE_ROOT, 'transactions.txt')
-DEBTS_FILE = os.path.join(ABE_ROOT, 'debts.txt')
-ADVANCES_FILE = os.path.join(ABE_ROOT, 'advances.txt')
-UNPAYABLE_CONTRIBUTORS_FILE = os.path.join(ABE_ROOT, 'unpayable_contributors.txt')
-ITEMIZED_PAYMENTS_FILE = os.path.join(ABE_ROOT, 'itemized_payments.txt')
-PRICE_FILE = os.path.join(ABE_ROOT, 'price.txt')
-VALUATION_FILE = os.path.join(ABE_ROOT, 'valuation.txt')
-ATTRIBUTIONS_FILE = 'attributions.txt'
-INSTRUMENTS_FILE = 'instruments.txt'
+TRANSACTIONS_FILE = os.path.join(ABE_ROOT, "transactions.txt")
+DEBTS_FILE = os.path.join(ABE_ROOT, "debts.txt")
+ADVANCES_FILE = os.path.join(ABE_ROOT, "advances.txt")
+UNPAYABLE_CONTRIBUTORS_FILE = os.path.join(
+    ABE_ROOT, "unpayable_contributors.txt"
+)
+ITEMIZED_PAYMENTS_FILE = os.path.join(ABE_ROOT, "itemized_payments.txt")
+PRICE_FILE = os.path.join(ABE_ROOT, "price.txt")
+VALUATION_FILE = os.path.join(ABE_ROOT, "valuation.txt")
+ATTRIBUTIONS_FILE = "attributions.txt"
+INSTRUMENTS_FILE = "instruments.txt"
+
+DECIMAL_PRECISION = 10

oldabe/models.py

@@ -1,6 +1,18 @@
 from datetime import datetime
 from dataclasses import dataclass, field
 from decimal import Decimal
+import re
+
+
+def row_to_model(row, model):
+    for field_, value in row.items():
+        field_type = getattr(model, field_).annotation
+        if field_type == Decimal:
+            row[field_] = Decimal(re.sub("[^0-9.]", "", value))
+        elif field_type == datetime:
+            row[field_] = datetime.fromisoformat(value)
+
+    return model(**row)
 
 
 @dataclass
@@ -74,3 +86,11 @@ class Attribution:
     email: str = None
     share: Decimal = 0
     dilutable: bool = True
+
+
+@dataclass
+class Payout:
+    name: str = None
+    email: str = None
+    amount: Decimal = 0
+    date: datetime = field(default_factory=datetime.utcnow)