Fixed an issue with ignored package being included in PR body incorrectly (#38)

src/readChangesetState.ts

@@ -0,0 +1,27 @@
+import { PreState, NewChangeset } from "@changesets/types";
+import { readPreState } from "@changesets/pre";
+import readChangesets from "@changesets/read";
+
+export type ChangesetState = {
+  preState: PreState | undefined;
+  changesets: NewChangeset[];
+};
+
+export default async function readChangesetState(
+  cwd: string = process.cwd()
+): Promise<ChangesetState> {
+  let preState = await readPreState(cwd);
+  let isInPreMode = preState !== undefined && preState.mode === "pre";
+
+  let changesets = await readChangesets(cwd);
+
+  if (isInPreMode) {
+    let changesetsToFilter = new Set(preState.changesets);
+    changesets = changesets.filter((x) => !changesetsToFilter.has(x.id));
+  }
+
+  return {
+    preState: isInPreMode ? preState : undefined,
+    changesets,
+  };
+}