allow using a single string as an ingredient instead of a dict

comfyrecipes/parsing.py

@@ -1,5 +1,6 @@
 from abc import abstractmethod
 import collections
+import re
 from typing import Any, Dict, List, Optional, Self
 
 import comfyrecipes.settings as settings
@@ -178,8 +179,8 @@ class IngredientInstance(Element):
         self,
         ctx: Context,
         name: str,
-        amount: float,
-        unit: Unit,
+        amount: Optional[float],
+        unit: Optional[Unit],
         alternatives: List["IngredientInstance"],
         note: str,
         price: Optional["PriceDB"],
@@ -193,7 +194,37 @@ class IngredientInstance(Element):
         self.price = price
 
     @classmethod
-    def from_dict(cls, ctx: Context, dct: Dict[str, Any]) -> Self:
+    def from_dict(cls, ctx: Context, dct: str | Dict[str, Any]) -> Self:
+        if isinstance(dct, str):
+            string = dct.strip()
+            p = re.compile(r"^(?:([0-9\.]+) ([a-zA-Z]+) )?([\w ]+)(?: \((.*)\))?$")
+            match = p.match(string)
+            if match is None:
+                raise RuntimeError(
+                    "ingredient {string} regex not matched, it should be in the format [amount(num) unit(string, one word)] name(string, any number of words) [(note(string))]"
+                )
+            amount = float(match.group(1))
+            unitstr = match.group(2)
+            unit = ctx.default_unit
+            if unit is not None:
+                unitx = ctx.units.get(unitstr)
+                if unitx is None:
+                    ctx.issues.error(issues.ISSUE_UNKNOWN_UNIT, "unknown unit {unitstr}")
+                else:
+                    unit = unitx
+            name = match.group(3)
+            note = match.group(4)
+            if note is None:
+                note = ""
+            return cls(
+                ctx=ctx,
+                name=dct,
+                amount=amount,
+                unit=unit,
+                alternatives=[],
+                note=note,
+                price=None,
+            )
         name = dct["name"]
 
         ingredient = ctx.ingredients.get(name)