Add horrible storage system

src/App.svelte

@@ -2,8 +2,27 @@
   import Card from './Card.svelte';
   import CardInput from './CardInput.svelte';
 
+  import { writable } from 'svelte/store';
   import LZString from 'lz-string';
 
+  const NO_CARD_MAGIC_STRING = "---";
+  let saved_cards = {};
+  let saved_cards_keys = [NO_CARD_MAGIC_STRING];
+  let selected_saved_card = NO_CARD_MAGIC_STRING;
+  const saved_cards_store = writable<object>(JSON.parse(localStorage.getItem("saved_cards")) || {} );
+  saved_cards_store.subscribe(v => {
+    if (Object.keys(v).length > 0) {
+      saved_cards = v;
+      saved_cards_keys = Object.keys(v).sort();
+    } else {
+      saved_cards = {};
+      saved_cards_keys = [NO_CARD_MAGIC_STRING]
+    }
+    selected_saved_card = saved_cards_keys[0];
+  })
+  saved_cards_store.update(n => n); // Dummy update
+  saved_cards_store.subscribe((value) => localStorage.setItem("saved_cards", JSON.stringify(value)));
+
   const MAX_CARDS = 9;
   let cards = [];
   let mhp = {
@@ -24,7 +43,7 @@
   function get_idx_by_id(id) {
     for(let idx = 0; idx < cards.length; idx++) {
       if(id === cards[idx].id) {
-	return idx
+	      return idx;
       }
     }
   }
@@ -66,12 +85,44 @@
       }
     }
   }
+
+  function save_card() {
+    saved_cards_store.update(n => {
+      let to_save = {};
+      for (let key in selected_card) {
+        if (key !== "id") {
+          to_save[key] = selected_card[key];
+        }
+      }
+      n[to_save["name"]] = to_save;
+      return n;
+    });
+  }
+
+  function load_card() {
+    if (selected_saved_card !== NO_CARD_MAGIC_STRING) {
+      let new_card = saved_cards[selected_saved_card];
+      selected_card.name = new_card.name;
+      selected_card.type = new_card.type;
+      selected_card.tags = new_card.tags;
+      selected_card.attributes = new_card.attributes;
+      selected_card.description = new_card.description;
+      cards = cards;
+    }
+  }
+
+  function delete_card() {
+    saved_cards_store.update(n => {
+      delete n[selected_saved_card];
+      return n;
+    })
+  }
 </script>
 
 <main>
   <section class="controls">
     <h1>PF2e card generator</h1>
-    <CardInput bind:name={selected_card.name} bind:type={selected_card.type} tags={selected_card.tags} bind:attributes={selected_card.attributes} bind:description={selected_card.description} on:change_tags={change_tags} on:add_card={add_card} on:remove_card={remove_card}/>
+    <CardInput bind:name={selected_card.name} bind:type={selected_card.type} tags={selected_card.tags} bind:attributes={selected_card.attributes} bind:description={selected_card.description} bind:saved_cards={saved_cards_keys} bind:selected_saved_card={selected_saved_card} on:change_tags={change_tags} on:add_card={add_card} on:remove_card={remove_card} on:save_card={save_card} on:load_card={load_card} on:delete_card={delete_card}/>
   </section>
   {#each pages as page}
   <section class="cards">

src/CardInput.svelte

@@ -42,7 +42,7 @@
     },
   };
   
-  export let name, type, tags, attributes, description;
+  export let name, type, tags, attributes, description, saved_cards, selected_saved_card;
   
   const dispatch = createEventDispatcher();
 
@@ -76,8 +76,18 @@
   <div class="row">Description:
     <Editor {apiKey} {conf} bind:value={description}/>
   </div>
+  <div class="row">
+    <select bind:value={selected_saved_card}>
+      {#each saved_cards as card}
+        <option value={card}>{card}</option>
+      {/each}
+    </select>
+  </div>
   <div class="row">
     <button on:click={e => dispatch('add_card')}>+</button>
     <button on:click={e => dispatch('remove_card')}>-</button>
+    <button on:click={e => dispatch('save_card')}>Save</button>
+    <button on:click={e => dispatch('load_card')}>Load</button>
+    <button on:click={e => dispatch('delete_card')}>Delete selected</button>
   </div>
 </div>