add: meal ingestion CLI for images and metadata

scripts/lib/meals.js

@@ -60,6 +60,10 @@ function validateMeals(meals) {
       }
     }
 
+    if (!/^\d+$/.test(meal.id)) {
+      throw new Error(`Meal ${index} has a non-numeric id "${meal.id}"`);
+    }
+
     if (meal.position !== undefined && typeof meal.position !== "string") {
       throw new Error(`Meal ${index} has a non-string "position" value`);
     }
@@ -82,8 +86,31 @@ function loadMeals() {
   return meals;
 }
 
+function saveMeals(meals) {
+  validateMeals(meals);
+  fs.writeFileSync(mealsPath, `${JSON.stringify(meals, null, 2)}\n`);
+}
+
+function getNextMealId(meals) {
+  if (meals.length === 0) {
+    return "01";
+  }
+
+  const nextNumber =
+    Math.max(...meals.map((meal) => Number.parseInt(meal.id, 10))) + 1;
+  const idWidth = Math.max(
+    2,
+    ...meals.map((meal) => meal.id.length),
+    String(nextNumber).length
+  );
+
+  return String(nextNumber).padStart(idWidth, "0");
+}
+
 module.exports = {
+  getNextMealId,
   loadMeals,
   mealsPath,
   repoRoot,
+  saveMeals,
 };