Handle blobs GitHub cannot preview

Binary files with no preview (a .ttf, say) have no rawLines, no
colorizedLines and no richText, so the blob view's final branch threw on
a null textLines and the page 500ed. Offer the raw file instead.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 18 insertions, 0 deletions

diff --git a/src/scraper.test.ts b/src/scraper.test.ts
index 24fdfc0..836235e 100644
--- a/src/scraper.test.ts
+++ b/src/scraper.test.ts
@@ -332,6 +332,24 @@ describe("GitHub scraper", () => {
       assert.strictEqual(data.htmlLines, null);
       assert.strictEqual(data.htmlContent, null);
     });
+
+    // A binary file GitHub has no preview for: no content of any kind, and the
+    // path exercises escaping of a space.
+    it("should support an unpreviewable binary file", async () => {
+      const data = await getGitHubBlob("justrajdeep", "fonts", "master", "Times New Roman.ttf");
+
+      assert.strictEqual(data.repo.owner, "justrajdeep");
+      assert.strictEqual(data.repo.name, "fonts");
+      assert.strictEqual(data.branch, "master");
+      assert.strictEqual(data.path, "Times New Roman.ttf");
+
+      assert.strictEqual(data.size, "815 KB");
+      assert.strictEqual(data.language, null);
+      assert.strictEqual(data.image, false);
+      assert.strictEqual(data.textLines, null);
+      assert.strictEqual(data.htmlLines, null);
+      assert.strictEqual(data.htmlContent, null);
+    });
   });
 
   describe("owner pages", () => {