Move CRUD logic from palette app to Vue mixin

docs/assets/scripts/vue/mixins/saved.js

@@ -0,0 +1,109 @@
+import my from '/assets/scripts/my.js';
+import Permalink from '/assets/scripts/tweak/permalink.js';
+
+export default {
+  data() {
+    return {
+      uid: undefined,
+      saved: null,
+      unsavedChanges: false,
+      permalink: new Permalink(),
+    };
+  },
+
+  created() {
+    if (this.permalink.has('uid')) {
+      this.uid = Number(this.permalink.get('uid'));
+      this.saved = this.controller.saved.find(p => p.uid === this.uid);
+    }
+
+    this.controller.addEventListener('delete', ({ detail: palette }) => {
+      if (palette.uid === this.saved?.uid) {
+        this.postDelete();
+      }
+    });
+  },
+
+  mounted() {
+    this.$nextTick().then(() => {
+      if (!location.search || this.saved) {
+        this.unsavedChanges = false;
+      }
+    });
+  },
+
+  computed: {
+    controller() {
+      return my[this.collection];
+    },
+
+    title() {
+      if (this.saved) {
+        return this.saved.title;
+      } else if (this.unsavedChanges) {
+        return this.defaultTitle;
+      } else {
+        return this.originalTitle;
+      }
+    },
+  },
+
+  watch: {
+    saved: {
+      deep: true,
+      handler() {
+        this.unsavedChanges = !this.saved;
+      },
+    },
+  },
+
+  methods: {
+    async save({ title } = {}) {
+      let uid = this.uid;
+
+      this.saved ??= { id: this.paletteId, uid: this.uid };
+
+      if (title) {
+        // Renaming
+        this.saved.title = title;
+      } else {
+        this.saved.title ??= this.defaultTitle;
+      }
+
+      this.saved.search = location.search;
+
+      this.saved = this.controller.save(this.saved);
+
+      if (uid !== this.saved.uid) {
+        // UID changed (most likely from saving a new palette)
+        this.uid = this.saved.uid;
+        this.permalink.set('uid', this.uid);
+        this.permalink.updateLocation();
+        await this.$nextTick();
+        this.save(); // Save again to update the search param to include the UID
+      }
+
+      this.unsavedChanges = false;
+    },
+
+    rename() {
+      let newTitle = prompt('Title:', this.saved?.title ?? this.defaultTitle);
+
+      if (newTitle && newTitle !== this.saved?.title) {
+        this.save({ title: newTitle });
+      }
+    },
+
+    // Cannot name this delete() because Vue complains
+    deleteSaved() {
+      this.controller.delete(this.saved);
+    },
+
+    postDelete() {
+      this.saved = null;
+      this.permalink.delete('uid');
+      this.uid = undefined;
+      this.permalink.updateLocation();
+    },
+  },
+};