Migrate to Deno (#86)

Big bang migration to Deno 🤯

web/commands.ts

@@ -0,0 +1,60 @@
+import { EditorSelection, StateCommand, Transaction } from "@codemirror/state";
+import { Text } from "@codemirror/state";
+
+export function insertMarker(marker: string): StateCommand {
+  return ({ state, dispatch }) => {
+    const changes = state.changeByRange((range) => {
+      const isBoldBefore =
+        state.sliceDoc(range.from - marker.length, range.from) === marker;
+      const isBoldAfter =
+        state.sliceDoc(range.to, range.to + marker.length) === marker;
+      const changes = [];
+
+      changes.push(
+        isBoldBefore
+          ? {
+              from: range.from - marker.length,
+              to: range.from,
+              insert: Text.of([""]),
+            }
+          : {
+              from: range.from,
+              insert: Text.of([marker]),
+            }
+      );
+
+      changes.push(
+        isBoldAfter
+          ? {
+              from: range.to,
+              to: range.to + marker.length,
+              insert: Text.of([""]),
+            }
+          : {
+              from: range.to,
+              insert: Text.of([marker]),
+            }
+      );
+
+      const extendBefore = isBoldBefore ? -marker.length : marker.length;
+      const extendAfter = isBoldAfter ? -marker.length : marker.length;
+
+      return {
+        changes,
+        range: EditorSelection.range(
+          range.from + extendBefore,
+          range.to + extendAfter
+        ),
+      };
+    });
+
+    dispatch(
+      state.update(changes, {
+        scrollIntoView: true,
+        annotations: Transaction.userEvent.of("input"),
+      })
+    );
+
+    return true;
+  };
+}