fix(integration): do not error on non-existing tag

integration/commits.ts

@@ -1,45 +1,59 @@
 import type { Repository } from "./repository.ts";
 import * as github from "./github.ts";
+import { equals, parse } from "@std/semver";
 
 /**
  * Get the commits between two Git references in the repository.
+ * If the tags for the specified versions are not found, an empty array is returned.
+ *
+ * @param repo The repository to fetch the commits from.
+ * @param from The version of the dependency to compare from.
+ * @param to The version of the dependency to compare to.
+ *
+ * @returns The commit messages between the two versions.
  */
 export async function compareCommits(
   repo: Repository,
-  base: string,
-  head: string,
+  from: string,
+  to: string,
 ): Promise<string[]> {
   //
   // Return the stored commits if available
   //
   using kv = await Deno.openKv();
-  const stored = await kv.get<string[]>([
-    "commits",
-    repo.owner,
-    repo.name,
-    base,
-    head,
-  ]);
+  const stored = await kv.get<string[]>(
+    ["commits", repo.owner, repo.name, from, to],
+  );
   if (stored.value) {
     return stored.value;
   }
   //
   // Otherwise, fetch the commits from the Git hosting platform
   //
-  const commits = await _compareCommits(repo, base, head);
+  const tags = await _getTags(repo);
+  // Tags and versions not necessarily include the "v" prefix consistently
+  const base = tags.find((it) => equals(parse(it), parse(from)));
+  const head = tags.find((it) => equals(parse(it), parse(to)));
+  if (!base || !head) {
+    return [];
+  }
+  const commits = await _compareCommits(repo, from, to);
   await kv.set(
-    [
-      "commits",
-      repo.owner,
-      repo.name,
-      base,
-      head,
-    ],
+    ["commits", repo.owner, repo.name, from, to],
     commits,
   );
   return commits;
 }
 
+async function _getTags(repo: Repository): Promise<string[]> {
+  switch (repo.host) {
+    case "github":
+      return await github.getTags(repo);
+    default:
+      throw new Error(`Unsupported Git hosting platform: ${repo.host}`);
+  }
+}
+
 async function _compareCommits(
   repo: Repository,
   base: string,

integration/commits_test.ts

@@ -0,0 +1,42 @@
+import { assertEquals } from "@std/assert";
+import { compareCommits } from "./commits.ts";
+
+Deno.test("compareCommits", async () => {
+  assertEquals(
+    await compareCommits(
+      {
+        host: "github",
+        owner: "hasundue",
+        name: "molt",
+      },
+      "0.17.0",
+      "0.17.2",
+    ),
+    [
+      "fix: accept a lock file without `dependencies`",
+      "test(cli): update snapshot",
+      "chore(task/update): enable `--unstable-lock`",
+      "chore(cli): `--version` returns `dev` if undefined",
+      "test(lib/file): check EOL at the end of file",
+      "fix: add EOL at the end of updated lock file",
+      "test(cli): stub latest version of `jsr:@std/`",
+      "test(cli): update snapshot",
+      "build(deps): bump deno.land/std from 0.219.1 to 0.220.1",
+    ],
+  );
+});
+
+Deno.test("compareCommits - non existing tags", async () => {
+  assertEquals(
+    await compareCommits(
+      {
+        host: "github",
+        owner: "hasundue",
+        name: "molt",
+      },
+      "0.0.1",
+      "0.0.2",
+    ),
+    [],
+  );
+});

integration/github.ts

@@ -27,6 +27,16 @@ export async function compareCommits(
   return data.commits.map((it) => it.commit.message);
 }
 
+export async function getTags(
+  repo: Repository<"github">,
+): Promise<string[]> {
+  const { data } = await octokit.repos.listTags({
+    owner: repo.owner,
+    repo: repo.name,
+  });
+  return data.map((it) => it.name);
+}
+
 type GitHubContent = {
   path?: string;
   type?: "blob" | "tree";

integration/github_test.ts

@@ -1,6 +1,6 @@
-import { assertEquals } from "@std/assert";
+import { assertArrayIncludes, assertEquals } from "@std/assert";
 import "@std/dotenv/load";
-import { compareCommits, resolvePackageRoot } from "./github.ts";
+import { compareCommits, getTags, resolvePackageRoot } from "./github.ts";
 import { parse } from "./packages.ts";
 import type { Repository } from "./repository.ts";
 
@@ -26,6 +26,18 @@ Deno.test("compareCommits", async () => {
   );
 });
 
+Deno.test("getTags", async () => {
+  const repo = {
+    host: "github",
+    owner: "hasundue",
+    name: "molt",
+  } satisfies Repository;
+  assertArrayIncludes(await getTags(repo), [
+    "0.18.5",
+    "0.19.0",
+  ]);
+});
+
 Deno.test("resolvePackageRoot", async () => {
   //
   // An example of a single package repository