Adds ingredients managing

cookbook/src/bin/write_recipe.rs

@@ -25,10 +25,18 @@ impl<'a> CreateRecipe<'a> {
         self.title = title;
     }
 
-    fn add_ingredient(&mut self, ingredient: String) {
-        // TODO: Validate ingredient
-        self.ingredients.push_str(&ingredient);
-        println!("+");
+    fn add_ingredient(&mut self, name: String) {
+        use crate::ingredients::*;
+
+        // Check it exists or create
+        if let Some(ingdt) = find(self.connection, &name) {
+            println!("=");
+        } else {
+            create(self.connection, &name);
+            println!("+{}", &name);
+        }
+
+        self.ingredients.push_str(&name);
     }
 
     fn insert(self) {