refactor: use FileService in importers for cloud compatibility

Refactor importers to use FileService for all file operations instead of
direct filesystem calls. This enables cloud environments to override file
operations via dependency injection (e.g., S3FileService).

Changes:
- Add `to_markdown_string()` method to MarkdownProcessor for content
  serialization without file I/O
- Update Importer base class to accept FileService and use it for:
  - `write_entity()` - now uses FileService.write_file()
  - `ensure_folder_exists()` - now async, uses FileService.ensure_directory()
- Fix direct `mkdir()` calls in:
  - claude_projects_importer.py
  - memory_json_importer.py
- Update deps.py to inject FileService into all importers (v1 and v2)
- Update CLI commands to create and pass FileService to importers
- Update tests to work with new FileService dependency

This follows the pattern used by /knowledge API and SyncService, enabling
cloud to override file operations by providing S3FileService via DI.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Signed-off-by: phernandez <paul@basicmachines.co>

Author: phernandez

src/basic_memory/cli/commands/import_chatgpt.py

@@ -3,26 +3,29 @@
 import asyncio
 import json
 from pathlib import Path
-from typing import Annotated
+from typing import Annotated, Tuple
 
 import typer
 from basic_memory.cli.app import import_app
 from basic_memory.config import ConfigManager, get_project_config
 from basic_memory.importers import ChatGPTImporter
 from basic_memory.markdown import EntityParser, MarkdownProcessor
+from basic_memory.services.file_service import FileService
 from loguru import logger
 from rich.console import Console
 from rich.panel import Panel
 
 console = Console()
 
 
-async def get_markdown_processor() -> MarkdownProcessor:
-    """Get MarkdownProcessor instance."""
+async def get_importer_dependencies() -> Tuple[MarkdownProcessor, FileService]:
+    """Get MarkdownProcessor and FileService instances for importers."""
     config = get_project_config()
     app_config = ConfigManager().config
     entity_parser = EntityParser(config.home)
-    return MarkdownProcessor(entity_parser, app_config=app_config)
+    markdown_processor = MarkdownProcessor(entity_parser, app_config=app_config)
+    file_service = FileService(config.home, markdown_processor, app_config=app_config)
+    return markdown_processor, file_service
 
 
 @import_app.command(name="chatgpt", help="Import conversations from ChatGPT JSON export.")
@@ -49,15 +52,15 @@ def import_chatgpt(
             typer.echo(f"Error: File not found: {conversations_json}", err=True)
             raise typer.Exit(1)
 
-        # Get markdown processor
-        markdown_processor = asyncio.run(get_markdown_processor())
+        # Get importer dependencies
+        markdown_processor, file_service = asyncio.run(get_importer_dependencies())
         config = get_project_config()
         # Process the file
         base_path = config.home / folder
         console.print(f"\nImporting chats from {conversations_json}...writing to {base_path}")
 
         # Create importer and run import
-        importer = ChatGPTImporter(config.home, markdown_processor)
+        importer = ChatGPTImporter(config.home, markdown_processor, file_service)
         with conversations_json.open("r", encoding="utf-8") as file:
             json_data = json.load(file)
             result = asyncio.run(importer.import_data(json_data, folder))

src/basic_memory/cli/commands/import_claude_conversations.py

@@ -3,26 +3,29 @@
 import asyncio
 import json
 from pathlib import Path
-from typing import Annotated
+from typing import Annotated, Tuple
 
 import typer
 from basic_memory.cli.app import claude_app
 from basic_memory.config import ConfigManager, get_project_config
 from basic_memory.importers.claude_conversations_importer import ClaudeConversationsImporter
 from basic_memory.markdown import EntityParser, MarkdownProcessor
+from basic_memory.services.file_service import FileService
 from loguru import logger
 from rich.console import Console
 from rich.panel import Panel
 
 console = Console()
 
 
-async def get_markdown_processor() -> MarkdownProcessor:
-    """Get MarkdownProcessor instance."""
+async def get_importer_dependencies() -> Tuple[MarkdownProcessor, FileService]:
+    """Get MarkdownProcessor and FileService instances for importers."""
     config = get_project_config()
     app_config = ConfigManager().config
     entity_parser = EntityParser(config.home)
-    return MarkdownProcessor(entity_parser, app_config=app_config)
+    markdown_processor = MarkdownProcessor(entity_parser, app_config=app_config)
+    file_service = FileService(config.home, markdown_processor, app_config=app_config)
+    return markdown_processor, file_service
 
 
 @claude_app.command(name="conversations", help="Import chat conversations from Claude.ai.")
@@ -50,11 +53,11 @@ def import_claude(
             typer.echo(f"Error: File not found: {conversations_json}", err=True)
             raise typer.Exit(1)
 
-        # Get markdown processor
-        markdown_processor = asyncio.run(get_markdown_processor())
+        # Get importer dependencies
+        markdown_processor, file_service = asyncio.run(get_importer_dependencies())
 
         # Create the importer
-        importer = ClaudeConversationsImporter(config.home, markdown_processor)
+        importer = ClaudeConversationsImporter(config.home, markdown_processor, file_service)
 
         # Process the file
         base_path = config.home / folder

src/basic_memory/cli/commands/import_claude_projects.py

@@ -3,26 +3,29 @@
 import asyncio
 import json
 from pathlib import Path
-from typing import Annotated
+from typing import Annotated, Tuple
 
 import typer
 from basic_memory.cli.app import claude_app
 from basic_memory.config import ConfigManager, get_project_config
 from basic_memory.importers.claude_projects_importer import ClaudeProjectsImporter
 from basic_memory.markdown import EntityParser, MarkdownProcessor
+from basic_memory.services.file_service import FileService
 from loguru import logger
 from rich.console import Console
 from rich.panel import Panel
 
 console = Console()
 
 
-async def get_markdown_processor() -> MarkdownProcessor:
-    """Get MarkdownProcessor instance."""
+async def get_importer_dependencies() -> Tuple[MarkdownProcessor, FileService]:
+    """Get MarkdownProcessor and FileService instances for importers."""
     config = get_project_config()
     app_config = ConfigManager().config
     entity_parser = EntityParser(config.home)
-    return MarkdownProcessor(entity_parser, app_config=app_config)
+    markdown_processor = MarkdownProcessor(entity_parser, app_config=app_config)
+    file_service = FileService(config.home, markdown_processor, app_config=app_config)
+    return markdown_processor, file_service
 
 
 @claude_app.command(name="projects", help="Import projects from Claude.ai.")
@@ -49,11 +52,11 @@ def import_projects(
             typer.echo(f"Error: File not found: {projects_json}", err=True)
             raise typer.Exit(1)
 
-        # Get markdown processor
-        markdown_processor = asyncio.run(get_markdown_processor())
+        # Get importer dependencies
+        markdown_processor, file_service = asyncio.run(get_importer_dependencies())
 
         # Create the importer
-        importer = ClaudeProjectsImporter(config.home, markdown_processor)
+        importer = ClaudeProjectsImporter(config.home, markdown_processor, file_service)
 
         # Process the file
         base_path = config.home / base_folder if base_folder else config.home

src/basic_memory/cli/commands/import_memory_json.py

@@ -3,26 +3,29 @@
 import asyncio
 import json
 from pathlib import Path
-from typing import Annotated
+from typing import Annotated, Tuple
 
 import typer
 from basic_memory.cli.app import import_app
 from basic_memory.config import ConfigManager, get_project_config
 from basic_memory.importers.memory_json_importer import MemoryJsonImporter
 from basic_memory.markdown import EntityParser, MarkdownProcessor
+from basic_memory.services.file_service import FileService
 from loguru import logger
 from rich.console import Console
 from rich.panel import Panel
 
 console = Console()
 
 
-async def get_markdown_processor() -> MarkdownProcessor:
-    """Get MarkdownProcessor instance."""
+async def get_importer_dependencies() -> Tuple[MarkdownProcessor, FileService]:
+    """Get MarkdownProcessor and FileService instances for importers."""
     config = get_project_config()
     app_config = ConfigManager().config
     entity_parser = EntityParser(config.home)
-    return MarkdownProcessor(entity_parser, app_config=app_config)
+    markdown_processor = MarkdownProcessor(entity_parser, app_config=app_config)
+    file_service = FileService(config.home, markdown_processor, app_config=app_config)
+    return markdown_processor, file_service
 
 
 @import_app.command()
@@ -48,11 +51,11 @@ def memory_json(
 
     config = get_project_config()
     try:
-        # Get markdown processor
-        markdown_processor = asyncio.run(get_markdown_processor())
+        # Get importer dependencies
+        markdown_processor, file_service = asyncio.run(get_importer_dependencies())
 
         # Create the importer
-        importer = MemoryJsonImporter(config.home, markdown_processor)
+        importer = MemoryJsonImporter(config.home, markdown_processor, file_service)
 
         # Process the file
         base_path = config.home if not destination_folder else config.home / destination_folder

src/basic_memory/deps.py

@@ -617,20 +617,24 @@ async def get_directory_service_v2(
 
 
 async def get_chatgpt_importer(
-    project_config: ProjectConfigDep, markdown_processor: MarkdownProcessorDep
+    project_config: ProjectConfigDep,
+    markdown_processor: MarkdownProcessorDep,
+    file_service: FileServiceDep,
 ) -> ChatGPTImporter:
     """Create ChatGPTImporter with dependencies."""
-    return ChatGPTImporter(project_config.home, markdown_processor)
+    return ChatGPTImporter(project_config.home, markdown_processor, file_service)
 
 
 ChatGPTImporterDep = Annotated[ChatGPTImporter, Depends(get_chatgpt_importer)]
 
 
 async def get_claude_conversations_importer(
-    project_config: ProjectConfigDep, markdown_processor: MarkdownProcessorDep
+    project_config: ProjectConfigDep,
+    markdown_processor: MarkdownProcessorDep,
+    file_service: FileServiceDep,
 ) -> ClaudeConversationsImporter:
-    """Create ChatGPTImporter with dependencies."""
-    return ClaudeConversationsImporter(project_config.home, markdown_processor)
+    """Create ClaudeConversationsImporter with dependencies."""
+    return ClaudeConversationsImporter(project_config.home, markdown_processor, file_service)
 
 
 ClaudeConversationsImporterDep = Annotated[
@@ -639,20 +643,24 @@ async def get_claude_conversations_importer(
 
 
 async def get_claude_projects_importer(
-    project_config: ProjectConfigDep, markdown_processor: MarkdownProcessorDep
+    project_config: ProjectConfigDep,
+    markdown_processor: MarkdownProcessorDep,
+    file_service: FileServiceDep,
 ) -> ClaudeProjectsImporter:
-    """Create ChatGPTImporter with dependencies."""
-    return ClaudeProjectsImporter(project_config.home, markdown_processor)
+    """Create ClaudeProjectsImporter with dependencies."""
+    return ClaudeProjectsImporter(project_config.home, markdown_processor, file_service)
 
 
 ClaudeProjectsImporterDep = Annotated[ClaudeProjectsImporter, Depends(get_claude_projects_importer)]
 
 
 async def get_memory_json_importer(
-    project_config: ProjectConfigDep, markdown_processor: MarkdownProcessorDep
+    project_config: ProjectConfigDep,
+    markdown_processor: MarkdownProcessorDep,
+    file_service: FileServiceDep,
 ) -> MemoryJsonImporter:
-    """Create ChatGPTImporter with dependencies."""
-    return MemoryJsonImporter(project_config.home, markdown_processor)
+    """Create MemoryJsonImporter with dependencies."""
+    return MemoryJsonImporter(project_config.home, markdown_processor, file_service)
 
 
 MemoryJsonImporterDep = Annotated[MemoryJsonImporter, Depends(get_memory_json_importer)]
@@ -662,20 +670,24 @@ async def get_memory_json_importer(
 
 
 async def get_chatgpt_importer_v2(
-    project_config: ProjectConfigV2Dep, markdown_processor: MarkdownProcessorV2Dep
+    project_config: ProjectConfigV2Dep,
+    markdown_processor: MarkdownProcessorV2Dep,
+    file_service: FileServiceV2Dep,
 ) -> ChatGPTImporter:
     """Create ChatGPTImporter with v2 dependencies."""
-    return ChatGPTImporter(project_config.home, markdown_processor)
+    return ChatGPTImporter(project_config.home, markdown_processor, file_service)
 
 
 ChatGPTImporterV2Dep = Annotated[ChatGPTImporter, Depends(get_chatgpt_importer_v2)]
 
 
 async def get_claude_conversations_importer_v2(
-    project_config: ProjectConfigV2Dep, markdown_processor: MarkdownProcessorV2Dep
+    project_config: ProjectConfigV2Dep,
+    markdown_processor: MarkdownProcessorV2Dep,
+    file_service: FileServiceV2Dep,
 ) -> ClaudeConversationsImporter:
     """Create ClaudeConversationsImporter with v2 dependencies."""
-    return ClaudeConversationsImporter(project_config.home, markdown_processor)
+    return ClaudeConversationsImporter(project_config.home, markdown_processor, file_service)
 
 
 ClaudeConversationsImporterV2Dep = Annotated[
@@ -684,10 +696,12 @@ async def get_claude_conversations_importer_v2(
 
 
 async def get_claude_projects_importer_v2(
-    project_config: ProjectConfigV2Dep, markdown_processor: MarkdownProcessorV2Dep
+    project_config: ProjectConfigV2Dep,
+    markdown_processor: MarkdownProcessorV2Dep,
+    file_service: FileServiceV2Dep,
 ) -> ClaudeProjectsImporter:
     """Create ClaudeProjectsImporter with v2 dependencies."""
-    return ClaudeProjectsImporter(project_config.home, markdown_processor)
+    return ClaudeProjectsImporter(project_config.home, markdown_processor, file_service)
 
 
 ClaudeProjectsImporterV2Dep = Annotated[
@@ -696,10 +710,12 @@ async def get_claude_projects_importer_v2(
 
 
 async def get_memory_json_importer_v2(
-    project_config: ProjectConfigV2Dep, markdown_processor: MarkdownProcessorV2Dep
+    project_config: ProjectConfigV2Dep,
+    markdown_processor: MarkdownProcessorV2Dep,
+    file_service: FileServiceV2Dep,
 ) -> MemoryJsonImporter:
     """Create MemoryJsonImporter with v2 dependencies."""
-    return MemoryJsonImporter(project_config.home, markdown_processor)
+    return MemoryJsonImporter(project_config.home, markdown_processor, file_service)
 
 
 MemoryJsonImporterV2Dep = Annotated[MemoryJsonImporter, Depends(get_memory_json_importer_v2)]