Add project time settings command and related files

src/commands/set-project-time-settings-command.ts

@@ -0,0 +1,47 @@
+import { createOpaqueId } from "../core/ids";
+import {
+  cloneProjectTimeSettings,
+  type ProjectTimeSettings
+} from "../document/project-time-settings";
+
+import type { EditorCommand } from "./command";
+
+interface SetProjectTimeSettingsCommandOptions {
+  label: string;
+  time: ProjectTimeSettings;
+}
+
+export function createSetProjectTimeSettingsCommand(
+  options: SetProjectTimeSettingsCommandOptions
+): EditorCommand {
+  const nextTime = cloneProjectTimeSettings(options.time);
+  let previousTime: ProjectTimeSettings | null = null;
+
+  return {
+    id: createOpaqueId("command"),
+    label: options.label,
+    execute(context) {
+      const currentProjectDocument = context.getProjectDocument();
+
+      if (previousTime === null) {
+        previousTime = cloneProjectTimeSettings(currentProjectDocument.time);
+      }
+
+      context.setProjectDocument({
+        ...currentProjectDocument,
+        time: cloneProjectTimeSettings(nextTime)
+      });
+    },
+    undo(context) {
+      if (previousTime === null) {
+        return;
+      }
+
+      const currentProjectDocument = context.getProjectDocument();
+      context.setProjectDocument({
+        ...currentProjectDocument,
+        time: cloneProjectTimeSettings(previousTime)
+      });
+    }
+  };
+}