Update to use single hello.txt file instead of creating new files

Instead of creating a new file for each pull (pull_1.txt, pull_2.txt, etc.),
now updates a single hello.txt file with the pull number and timestamp
with nanosecond precision.

Changes:
- Modified commit generator to update hello.txt instead of creating new files
- Added hello.txt to initial repository commit
- Updated tests to verify hello.txt content instead of checking for new files
- Fixed test expectations to account for counter increment during clone

🤖 Generated with [Claude Code](https://claude.ai/code)

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

internal/generator/commit.go

@@ -63,26 +63,28 @@ func (g *Generator) GenerateCommit() (string, error) {
 	// Parse existing tree entries
 	existingEntries := parseTree(parentTreeData)
 
-	// Create new file content
-	filename := fmt.Sprintf("pull_%d.txt", count)
-	content := fmt.Sprintf("Pull request #%d\nTimestamp: %s\n", count, time.Now().Format(time.RFC3339))
+	// Create updated hello.txt content with nanosecond precision
+	filename := "hello.txt"
+	content := fmt.Sprintf("Pull #%d\nTimestamp: %s\n", count, time.Now().Format("2006-01-02 15:04:05.999999999"))
 
-	// Create blob for new file
+	// Create blob for updated file
 	blob := object.NewBlob([]byte(content))
 	blobHash, err := g.repo.WriteObject(blob)
 	if err != nil {
 		return "", fmt.Errorf("writing blob: %w", err)
 	}
 
-	// Create new tree with all existing entries plus new file
+	// Create new tree with all existing entries, replacing hello.txt
 	tree := object.NewTree()
 
-	// Add existing entries
+	// Add existing entries, but skip hello.txt as we'll add the updated one
 	for _, entry := range existingEntries {
-		tree.AddEntry(entry.Mode, entry.Name, entry.Hash)
+		if entry.Name != filename {
+			tree.AddEntry(entry.Mode, entry.Name, entry.Hash)
+		}
 	}
 
-	// Add new file
+	// Add updated hello.txt
 	tree.AddEntry("100644", filename, blobHash)
 
 	treeHash, err := g.repo.WriteObject(tree)

internal/repo/repo.go

@@ -91,15 +91,24 @@ func (r *Repository) createInitialCommit() error {
 	readmeContent := []byte("# Infinite Git Repository\n\nThis repository generates a new commit every time you pull.\n")
 
 	// Create blob for README
-	blob := object.NewBlob(readmeContent)
-	blobHash, err := object.Write(r.gitDir, blob)
+	readmeBlob := object.NewBlob(readmeContent)
+	readmeBlobHash, err := object.Write(r.gitDir, readmeBlob)
 	if err != nil {
-		return fmt.Errorf("writing blob: %w", err)
+		return fmt.Errorf("writing README blob: %w", err)
 	}
 
-	// Create tree with README
+	// Create initial hello.txt content
+	helloContent := []byte("Pull #0\nTimestamp: Initial commit\n")
+	helloBlob := object.NewBlob(helloContent)
+	helloBlobHash, err := object.Write(r.gitDir, helloBlob)
+	if err != nil {
+		return fmt.Errorf("writing hello.txt blob: %w", err)
+	}
+
+	// Create tree with README and hello.txt
 	tree := object.NewTree()
-	tree.AddEntry("100644", "README.md", blobHash)
+	tree.AddEntry("100644", "README.md", readmeBlobHash)
+	tree.AddEntry("100644", "hello.txt", helloBlobHash)
 	treeHash, err := object.Write(r.gitDir, tree)
 	if err != nil {
 		return fmt.Errorf("writing tree: %w", err)
@@ -124,12 +133,17 @@ func (r *Repository) createInitialCommit() error {
 		return fmt.Errorf("updating ref: %w", err)
 	}
 
-	// Also write README to working directory
+	// Also write README and hello.txt to working directory
 	readmePath := filepath.Join(r.path, "README.md")
 	if err := os.WriteFile(readmePath, readmeContent, 0644); err != nil {
 		return fmt.Errorf("writing README to working directory: %w", err)
 	}
 
+	helloPath := filepath.Join(r.path, "hello.txt")
+	if err := os.WriteFile(helloPath, helloContent, 0644); err != nil {
+		return fmt.Errorf("writing hello.txt to working directory: %w", err)
+	}
+
 	return nil
 }