Phase 6: Add tree-style progress visualization

- TreePrinter class for formatted output
- Tree characters (├──, └──, │) for hierarchy
- Status indicators (✓ created, ○ skipped, ✗ error)
- Box-drawing characters for header/summary
- Consistent output format matching spec

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

outline_import.py

@@ -40,6 +40,43 @@ logging.basicConfig(
 logger = logging.getLogger('outline_import')
 
 
+class TreePrinter:
+    """Utility for printing tree-style output."""
+
+    PIPE = "│   "
+    ELBOW = "└── "
+    TEE = "├── "
+    BLANK = "    "
+
+    @staticmethod
+    def format_line(title: str, status: str, message: str = None, prefix: str = "") -> str:
+        """Format a tree line with status indicator."""
+        # Status symbols and labels
+        if status == "created":
+            symbol = "✓"
+            label = "created"
+        elif status == "skipped":
+            symbol = "○"
+            label = "skipped"
+        elif status == "dry_run":
+            symbol = "○"
+            label = "(dry run)"
+        else:
+            symbol = "✗"
+            label = message or "error"
+
+        # Truncate title if too long
+        max_title_len = 40
+        if len(title) > max_title_len:
+            display_title = title[:max_title_len - 3] + "..."
+        else:
+            display_title = title
+
+        # Format: prefix + title + padding + symbol + label
+        filename = f"{display_title}.md"
+        return f"{prefix}{filename:<45} {symbol} {label}"
+
+
 class OutlineImporter:
     """Import documents into Outline with hierarchy preservation."""
 
@@ -181,14 +218,16 @@ class OutlineImporter:
         Returns:
             True if API is accessible and authenticated
         """
-        logger.info("Checking API connectivity...")
+        print("Checking API connectivity...", end=" ")
         result = self._api_request("/api/auth.info")
         if result and "data" in result:
             user = result["data"].get("user", {})
             team = result["data"].get("team", {})
-            logger.info(f"Authenticated as: {user.get('name', 'Unknown')} ({user.get('email', 'N/A')})")
-            logger.info(f"Team: {team.get('name', 'Unknown')}")
+            print("✓")
+            logger.debug(f"Authenticated as: {user.get('name', 'Unknown')} ({user.get('email', 'N/A')})")
+            logger.debug(f"Team: {team.get('name', 'Unknown')}")
             return True
+        print("✗")
         logger.error("Health check failed: Unable to verify authentication")
         return False
 
@@ -453,7 +492,7 @@ class OutlineImporter:
         parent_document_id: Optional[str] = None
     ) -> Tuple[int, int, int]:
         """
-        Import a single collection.
+        Import a single collection with tree-style output.
 
         Args:
             collection_dir: Path to collection directory
@@ -492,108 +531,144 @@ class OutlineImporter:
             # Check if collection exists
             if collection_name in self.existing_collections:
                 if self.force:
-                    logger.info(f"  Deleting existing collection \"{collection_name}\"...")
+                    print(f"  Deleting existing collection \"{collection_name}\"...")
                     if not self.dry_run:
                         self._delete_collection(self.existing_collections[collection_name])
                         del self.existing_collections[collection_name]
                 else:
-                    logger.info(f"  Collection exists, skipping...")
+                    print(f"  Collection exists, skipping...")
                     self.stats["collections_skipped"] += 1
                     return (0, doc_count, 0)
 
             # Create collection
-            logger.info(f"  Creating collection...")
-            collection_id = self._create_collection(collection_name)
-            if not collection_id:
-                self.stats["collections_errors"] += 1
-                self.errors.append({
-                    "type": "collection",
-                    "name": collection_name,
-                    "error": "Failed to create collection"
-                })
-                return (0, 0, 1)
+            if self.dry_run:
+                print(f"  [DRY RUN] Would create collection \"{collection_name}\"")
+                collection_id = "dry-run-collection-id"
+            else:
+                print(f"  Creating collection...", end=" ")
+                collection_id = self._create_collection(collection_name)
+                if not collection_id:
+                    print("✗ failed")
+                    self.stats["collections_errors"] += 1
+                    self.errors.append({
+                        "type": "collection",
+                        "name": collection_name,
+                        "error": "Failed to create collection"
+                    })
+                    return (0, 0, 1)
+                print(f"✓ (id: {collection_id[:8]}...)")
 
-            if not self.dry_run:
-                logger.info(f"  ✓ (id: {collection_id[:8]}...)")
             self.stats["collections_created"] += 1
 
-        # Build document tree and flatten for import
+        # Build document tree for tree-style import
         doc_tree = self.build_document_tree(documents)
-        import_order = self.flatten_for_import(doc_tree)
 
-        # Import documents
+        # Import documents with tree visualization
         created = 0
         skipped = 0
         errors = 0
 
-        for doc_meta in import_order:
-            old_id = doc_meta["id"]
-            title = doc_meta["title"]
-            filename = doc_meta["filename"]
-            old_parent_id = doc_meta.get("parent_id")
+        def import_tree_recursive(
+            docs: List[Dict],
+            prefix: str = "  ",
+            coll_id: str = None,
+            default_parent_id: str = None
+        ) -> Tuple[int, int, int]:
+            """Recursively import documents with tree-style output."""
+            nonlocal created, skipped, errors
 
-            # Resolve parent ID
-            new_parent_id = parent_document_id  # Default for single mode
-            if old_parent_id:
-                new_parent_id = self.id_map.get(old_parent_id)
-                if not new_parent_id and not self.dry_run:
-                    logger.warning(f"Parent not found for {title}, creating as root-level")
+            for i, doc in enumerate(docs):
+                is_last = (i == len(docs) - 1)
+                connector = TreePrinter.ELBOW if is_last else TreePrinter.TEE
 
-            # Read content
-            content = self.read_document_content(collection_dir, filename)
-            if content is None:
-                self._print_doc_status(title, "error", "file not found")
-                errors += 1
-                self.stats["documents_errors"] += 1
-                self.errors.append({
-                    "type": "document",
-                    "title": title,
-                    "collection": collection_name,
-                    "error": "File not found"
-                })
-                continue
+                old_id = doc["id"]
+                title = doc["title"]
+                filename = doc["filename"]
+                old_parent_id = doc.get("parent_id")
+                children = doc.get("_children", []) or doc.get("children", [])
 
-            # Create document
-            new_id = self._create_document(
-                collection_id,
-                title,
-                content,
-                parent_document_id=new_parent_id
-            )
+                # Resolve parent ID
+                new_parent_id = default_parent_id
+                if old_parent_id:
+                    new_parent_id = self.id_map.get(old_parent_id, default_parent_id)
 
-            if new_id:
-                self.id_map[old_id] = new_id
-                self._print_doc_status(title, "created")
-                created += 1
-                self.stats["documents_created"] += 1
-            else:
-                self._print_doc_status(title, "error", "API error")
-                errors += 1
-                self.stats["documents_errors"] += 1
-                self.errors.append({
-                    "type": "document",
-                    "title": title,
-                    "collection": collection_name,
-                    "error": "API error during creation"
-                })
+                # Read content
+                content = self.read_document_content(collection_dir, filename)
+                if content is None:
+                    line = TreePrinter.format_line(title, "error", "file not found", prefix + connector)
+                    print(line)
+                    errors += 1
+                    self.stats["documents_errors"] += 1
+                    self.errors.append({
+                        "type": "document",
+                        "title": title,
+                        "collection": collection_name,
+                        "error": "File not found"
+                    })
+                    # Skip children if parent failed
+                    if children:
+                        child_prefix = prefix + (TreePrinter.BLANK if is_last else TreePrinter.PIPE)
+                        print(f"{child_prefix}└── (children skipped due to parent failure)")
+                    continue
+
+                # Create document
+                if self.dry_run:
+                    line = TreePrinter.format_line(title, "dry_run", prefix=prefix + connector)
+                    print(line)
+                    self.id_map[old_id] = f"dry-run-{old_id}"
+                    created += 1
+                    self.stats["documents_created"] += 1
+                else:
+                    new_id = self._create_document(
+                        coll_id,
+                        title,
+                        content,
+                        parent_document_id=new_parent_id
+                    )
+
+                    if new_id:
+                        self.id_map[old_id] = new_id
+                        line = TreePrinter.format_line(title, "created", prefix=prefix + connector)
+                        print(line)
+                        created += 1
+                        self.stats["documents_created"] += 1
+                    else:
+                        line = TreePrinter.format_line(title, "error", "API error", prefix + connector)
+                        print(line)
+                        errors += 1
+                        self.stats["documents_errors"] += 1
+                        self.errors.append({
+                            "type": "document",
+                            "title": title,
+                            "collection": collection_name,
+                            "error": "API error during creation"
+                        })
+                        # Skip children if parent failed
+                        if children:
+                            child_prefix = prefix + (TreePrinter.BLANK if is_last else TreePrinter.PIPE)
+                            print(f"{child_prefix}└── (children skipped due to parent failure)")
+                        continue
+
+                # Process children recursively
+                if children:
+                    child_prefix = prefix + (TreePrinter.BLANK if is_last else TreePrinter.PIPE)
+                    import_tree_recursive(
+                        children,
+                        prefix=child_prefix,
+                        coll_id=coll_id,
+                        default_parent_id=self.id_map.get(old_id, default_parent_id)
+                    )
+
+        # Start recursive import
+        import_tree_recursive(
+            doc_tree,
+            prefix="  ",
+            coll_id=collection_id,
+            default_parent_id=parent_document_id
+        )
 
         return (created, skipped, errors)
 
-    def _print_doc_status(self, title: str, status: str, message: str = None):
-        """Print document import status."""
-        if status == "created":
-            symbol = "✓"
-            label = "created"
-        elif status == "skipped":
-            symbol = "○"
-            label = "skipped"
-        else:
-            symbol = "✗"
-            label = message or "error"
-
-        # This will be enhanced in Phase 6 with tree formatting
-        logger.info(f"    {symbol} {title[:50]:<50} {label}")
-
     def import_all(self) -> None:
         """Import all collections from source directory."""
         start_time = time.time()
@@ -602,9 +677,9 @@ class OutlineImporter:
         mode_str = "Single collection" if self.single_mode else "Collection per folder"
         dry_run_str = " (DRY RUN)" if self.dry_run else ""
 
-        print("=" * 60)
+        print("════════════════════════════════════════════════════════════")
         print(f"  OUTLINE IMPORT{dry_run_str}")
-        print("=" * 60)
+        print("════════════════════════════════════════════════════════════")
         print()
         print(f"Source:  {self.source_dir}/")
         print(f"Target:  {self.base_url}")
@@ -687,9 +762,12 @@ class OutlineImporter:
         # Print summary
         duration = time.time() - start_time
         print()
-        print("=" * 60)
-        print("SUMMARY")
-        print("=" * 60)
+        print("════════════════════════════════════════════════════════════")
+        if self.dry_run:
+            print("DRY RUN SUMMARY")
+        else:
+            print("SUMMARY")
+        print("════════════════════════════════════════════════════════════")
         print(f"  Collections:  {self.stats['collections_created']} created, "
               f"{self.stats['collections_skipped']} skipped, "
               f"{self.stats['collections_errors']} errors")
@@ -697,11 +775,11 @@ class OutlineImporter:
               f"{self.stats['documents_skipped']} skipped, "
               f"{self.stats['documents_errors']} errors")
         print(f"  Duration:     {duration:.1f} seconds")
-        print("=" * 60)
+        print("════════════════════════════════════════════════════════════")
 
         if self.errors:
             print()
-            logger.warning(f"Encountered {len(self.errors)} errors during import")
+            print(f"Encountered {len(self.errors)} errors during import:")
 
 
 def load_settings(settings_file: str = "settings.json") -> Dict: