add option to clone current config

ts/deckoptions/ConfigSelector.svelte

@@ -40,38 +40,52 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
         }
     }
 
+    function onCloneConfig(text: string): void {
+        const trimmed = text.trim();
+        if (trimmed.length) {
+            state.cloneConfig(trimmed);
+        }
+    }
+
     function onRenameConfig(text: string): void {
         state.setCurrentName(text);
     }
 
     const modals = getContext<Map<string, Modal>>(modalsKey);
 
-    let addModalKey: string;
-    let renameModalKey: string;
-    let oldName = "";
+    let modalKey: string;
+    let modalStartingValue = "";
+    let modalTitle = "";
+    let modalSuccess = (_text: string) => {};
 
-    function onAdd() {
-        modals.get(addModalKey)!.show();
+    function promptToAdd() {
+        modalTitle = "Add Config";
+        modalSuccess = onAddConfig;
+        modalStartingValue = "";
+        modals.get(modalKey)!.show();
     }
 
-    function onRename() {
-        oldName = state.getCurrentName();
-        modals.get(renameModalKey)!.show();
+    function promptToClone() {
+        modalTitle = "Clone Config";
+        modalSuccess = onCloneConfig;
+        modalStartingValue = state.getCurrentName();
+        modals.get(modalKey)!.show();
+    }
+
+    function promptToRename() {
+        modalTitle = "Rename Config";
+        modalSuccess = onRenameConfig;
+        modalStartingValue = state.getCurrentName();
+        modals.get(modalKey)!.show();
     }
 </script>
 
 <TextInputModal
-    title="Add Config"
+    title={modalTitle}
     prompt="Name"
-    onOk={onAddConfig}
-    bind:modalKey={addModalKey}
-/>
-<TextInputModal
-    title="Rename Config"
-    prompt="Name"
-    onOk={onRenameConfig}
-    value={oldName}
-    bind:modalKey={renameModalKey}
+    value={modalStartingValue}
+    onOk={modalSuccess}
+    bind:modalKey
 />
 
 <StickyBar>
@@ -95,7 +109,12 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             </ButtonToolbarItem>
 
             <ButtonToolbarItem>
-                <SaveButton {state} on:add={onAdd} on:rename={onRename} />
+                <SaveButton
+                    {state}
+                    on:add={promptToAdd}
+                    on:clone={promptToClone}
+                    on:rename={promptToRename}
+                />
             </ButtonToolbarItem>
         </ButtonToolbar>
     </WithTheming>

ts/deckoptions/SaveButton.svelte

@@ -57,6 +57,9 @@ License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html
             <LabelButton on:mount={createDropdown} on:click={activateDropdown} />
             <DropdownMenu id={menuId}>
                 <DropdownItem on:click={() => dispatch("add")}>Add Config</DropdownItem>
+                <DropdownItem on:click={() => dispatch("clone")}
+                    >Clone Config</DropdownItem
+                >
                 <DropdownItem on:click={() => dispatch("rename")}>
                     Rename Config
                 </DropdownItem>

ts/deckoptions/lib.ts

@@ -140,11 +140,24 @@ export class DeckOptionsState {
 
     /// Adds a new config, making it current.
     addConfig(name: string): void {
+        this.addConfigFrom(name, this.defaults);
+    }
+
+    /// Clone the current config, making it current.
+    cloneConfig(name: string): void {
+        this.addConfigFrom(name, this.configs[this.selectedIdx].config.config!);
+    }
+
+    /// Clone the current config, making it current.
+    private addConfigFrom(
+        name: string,
+        source: pb.BackendProto.DeckConfig.IConfig
+    ): void {
         const uniqueName = this.ensureNewNameUnique(name);
         const config = pb.BackendProto.DeckConfig.create({
             id: 0,
             name: uniqueName,
-            config: cloneDeep(this.defaults),
+            config: cloneDeep(source),
         });
         const configWithCount = { config, useCount: 0 };
         this.configs.push(configWithCount);