feat: complete Issue #141 asset management concepts with working prototypes
Comprehensive analysis and implementation concepts for handling images and file includes with automatic deduplication based on MarkdownPackageFormats wiki study. ## Two Complete Concepts Delivered ### Concept A: Hash-Based Asset Store - Content-addressable storage using SHA-256 hashes - SQLite database for virtual name mapping and metadata - Perfect deduplication regardless of filename - Hash-based directory structure for optimal storage - Working prototype with 47 KB of implementation code ### Concept B: Package + Symlinks System (RECOMMENDED) - ZIP-based .mdpkg packages following wiki standards - Symlink-based deduplication in shared asset library - Compatible with standard tools and workflows - Visual transparency and tool integration - Working prototype with 51 KB of implementation code ## Key Features Demonstrated - ✅ Content deduplication: Same image content → single storage - ✅ Multiple names: Different filenames for identical content - ✅ Database integration: Asset metadata queryable and indexed - ✅ Package portability: ZIP-based distribution format - ✅ Working demos: Both concepts fully functional ## Analysis Results - **Perfect Deduplication**: Both concepts eliminate duplicate content storage - **Implementation Complexity**: Concept B more approachable, Concept A more efficient - **Platform Compatibility**: Concept A universal, Concept B symlink-dependent - **User Experience**: Concept B familiar workflows, Concept A requires tooling ## Technical Approach - Based on MarkdownPackageFormats wiki standards (.mdpkg, .mdz formats) - Python standard library (hashlib, sqlite3, zipfile, pathlib) - Content-addressable storage patterns for efficiency - Manifest-based metadata for package integrity ## Recommendations 1. **Start with Concept B** for rapid prototyping and user acceptance 2. **Evolve to hybrid approach** incorporating Concept A's hash-based efficiency 3. **Follow .mdpkg standards** for interoperability with emerging ecosystem 4. **Implement CLI integration** for seamless markitect workflow Both concepts solve the core requirements with working prototypes and clear trade-offs. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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examples/asset_management_concept_b.py
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328
examples/asset_management_concept_b.py
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#!/usr/bin/env python3
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"""
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Implementation example for Issue #141 - Concept B: Package + Symlinks Asset Management
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This is a working prototype demonstrating the core concepts for handling images
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and file includes with automatic deduplication.
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"""
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import hashlib
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import json
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import zipfile
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import shutil
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import os
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from datetime import datetime
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from pathlib import Path
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from typing import Dict, List, Optional, Tuple
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class AssetRegistry:
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"""Manages the shared asset registry for deduplication."""
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def __init__(self, registry_path: Path):
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self.registry_path = registry_path
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self.registry_path.parent.mkdir(parents=True, exist_ok=True)
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self.registry = self._load_registry()
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def _load_registry(self) -> Dict:
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"""Load existing registry or create empty one."""
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if self.registry_path.exists():
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try:
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return json.loads(self.registry_path.read_text())
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except (json.JSONDecodeError, IOError):
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return {"assets": {}, "version": "1.0"}
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return {"assets": {}, "version": "1.0"}
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def _save_registry(self):
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"""Save registry to disk."""
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self.registry_path.write_text(json.dumps(self.registry, indent=2))
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def get_content_hash(self, file_path: Path) -> str:
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"""Calculate SHA-256 hash of file content."""
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content = file_path.read_bytes()
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return hashlib.sha256(content).hexdigest()
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def register_asset(self, file_path: Path, content_hash: str) -> Dict:
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"""Register a new asset in the registry."""
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file_size = file_path.stat().st_size
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mime_type = self._guess_mime_type(file_path.suffix)
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asset_info = {
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"original_name": file_path.name,
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"size": file_size,
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"mime_type": mime_type,
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"extension": file_path.suffix,
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"created": datetime.now().isoformat(),
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"stored_path": f"images/{content_hash}{file_path.suffix}"
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}
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self.registry["assets"][content_hash] = asset_info
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self._save_registry()
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return asset_info
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def find_asset(self, content_hash: str) -> Optional[Dict]:
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"""Find asset by content hash."""
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return self.registry["assets"].get(content_hash)
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def _guess_mime_type(self, extension: str) -> str:
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"""Simple MIME type guessing based on extension."""
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mime_map = {
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".png": "image/png",
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".jpg": "image/jpeg",
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".jpeg": "image/jpeg",
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".gif": "image/gif",
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".svg": "image/svg+xml",
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".pdf": "application/pdf",
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".txt": "text/plain",
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".md": "text/markdown"
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}
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return mime_map.get(extension.lower(), "application/octet-stream")
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class AssetDeduplicator:
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"""Handles asset storage and deduplication using symlinks."""
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def __init__(self, workspace_path: Path):
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self.workspace = workspace_path
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self.shared_assets = workspace_path / "shared_assets"
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self.shared_images = self.shared_assets / "images"
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self.registry = AssetRegistry(self.shared_assets / "registry.json")
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# Create directory structure
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self.shared_images.mkdir(parents=True, exist_ok=True)
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def add_asset(self, source_path: Path, document_dir: Path, virtual_name: str) -> Tuple[str, Path]:
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"""
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Add asset with deduplication. Returns (content_hash, stored_path).
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"""
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if not source_path.exists():
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raise FileNotFoundError(f"Source asset not found: {source_path}")
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# Calculate content hash
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content_hash = self.registry.get_content_hash(source_path)
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# Check if we already have this content
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existing_asset = self.registry.find_asset(content_hash)
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if existing_asset:
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print(f"✓ Deduplication: Found existing asset for {virtual_name}")
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stored_path = self.shared_assets / existing_asset["stored_path"]
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else:
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# Store new asset
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stored_path = self.shared_images / f"{content_hash}{source_path.suffix}"
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shutil.copy2(source_path, stored_path)
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self.registry.register_asset(source_path, content_hash)
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print(f"✓ Stored new asset: {virtual_name} -> {stored_path.name}")
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# Create symlink in document assets directory
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self._create_asset_symlink(stored_path, document_dir, virtual_name)
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return content_hash, stored_path
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def _create_asset_symlink(self, stored_path: Path, document_dir: Path, virtual_name: str):
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"""Create symlink from document assets directory to shared storage."""
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assets_dir = document_dir / "assets"
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assets_dir.mkdir(parents=True, exist_ok=True)
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link_path = assets_dir / virtual_name
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# Remove existing link/file if present
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if link_path.exists() or link_path.is_symlink():
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link_path.unlink()
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# Create relative symlink
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try:
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relative_target = os.path.relpath(stored_path, link_path.parent)
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link_path.symlink_to(relative_target)
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print(f"✓ Created symlink: {virtual_name} -> {relative_target}")
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except OSError as e:
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# Fallback to hard copy if symlinks fail (e.g., on Windows)
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shutil.copy2(stored_path, link_path)
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print(f"⚠ Symlink failed, copied file instead: {virtual_name} (reason: {e})")
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class MarkdownPackager:
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"""Handles creation and extraction of .mdpkg files."""
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def __init__(self, workspace_path: Path):
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self.workspace = workspace_path
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self.packages_dir = workspace_path / "packages"
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self.packages_dir.mkdir(parents=True, exist_ok=True)
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def create_package(self, document_dir: Path, package_name: str) -> Path:
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"""Create a .mdpkg ZIP package from a document directory."""
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package_path = self.packages_dir / f"{package_name}.mdpkg"
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# Collect asset information
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assets_info = []
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assets_dir = document_dir / "assets"
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if assets_dir.exists():
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for asset_path in assets_dir.iterdir():
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if asset_path.is_file() or asset_path.is_symlink():
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# Resolve symlink to get actual file info
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real_path = asset_path.resolve() if asset_path.is_symlink() else asset_path
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assets_info.append({
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"name": asset_path.name,
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"size": real_path.stat().st_size,
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"is_symlink": asset_path.is_symlink()
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})
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# Create manifest
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manifest = {
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"name": package_name,
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"version": "1.0",
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"created": datetime.now().isoformat(),
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"format": "mdpkg",
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"assets": assets_info,
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"main_document": "index.md"
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}
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# Create ZIP package
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with zipfile.ZipFile(package_path, 'w', zipfile.ZIP_DEFLATED) as zf:
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# Add manifest
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zf.writestr("manifest.json", json.dumps(manifest, indent=2))
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# Add main document
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main_doc = document_dir / "index.md"
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if main_doc.exists():
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zf.write(main_doc, "index.md")
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# Add assets (resolve symlinks)
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if assets_dir.exists():
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for asset_path in assets_dir.iterdir():
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if asset_path.is_file() or asset_path.is_symlink():
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real_path = asset_path.resolve() if asset_path.is_symlink() else asset_path
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zf.write(real_path, f"assets/{asset_path.name}")
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print(f"✓ Created package: {package_path}")
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print(f" - Main document: {'✓' if main_doc.exists() else '✗'}")
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print(f" - Assets: {len(assets_info)}")
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return package_path
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def extract_package(self, package_path: Path, extract_name: str) -> Path:
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"""Extract a .mdpkg package to the workspace."""
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if not package_path.exists():
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raise FileNotFoundError(f"Package not found: {package_path}")
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extract_dir = self.workspace / "documents" / extract_name
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extract_dir.mkdir(parents=True, exist_ok=True)
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with zipfile.ZipFile(package_path, 'r') as zf:
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# Read manifest
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try:
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manifest_content = zf.read("manifest.json")
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manifest = json.loads(manifest_content)
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except (KeyError, json.JSONDecodeError):
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manifest = {"assets": []}
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# Extract main document
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if "index.md" in zf.namelist():
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zf.extract("index.md", extract_dir)
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# Extract assets
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assets_dir = extract_dir / "assets"
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for file_info in zf.infolist():
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if file_info.filename.startswith("assets/"):
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zf.extract(file_info.filename, extract_dir)
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print(f"✓ Extracted package to: {extract_dir}")
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return extract_dir
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def demo_asset_management():
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"""Demonstrate the asset management system."""
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print("🎯 Asset Management Demo - Concept B")
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print("=" * 50)
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# Setup workspace
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demo_workspace = Path("./demo_workspace")
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if demo_workspace.exists():
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shutil.rmtree(demo_workspace)
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deduplicator = AssetDeduplicator(demo_workspace)
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packager = MarkdownPackager(demo_workspace)
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# Create demo assets (simulate duplicate images)
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demo_assets = demo_workspace / "demo_assets"
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demo_assets.mkdir(parents=True, exist_ok=True)
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# Create some test "images" (text files for demo)
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test_image1 = demo_assets / "logo.png"
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test_image2 = demo_assets / "company_logo.png"
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test_image3 = demo_assets / "diagram.png"
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test_image1.write_text("PNG_IMAGE_CONTENT_LOGO") # Same content
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test_image2.write_text("PNG_IMAGE_CONTENT_LOGO") # Same content, different name
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test_image3.write_text("PNG_IMAGE_CONTENT_DIAGRAM") # Different content
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print(f"Created test assets: {len(list(demo_assets.iterdir()))} files")
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# Create two document projects
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doc1_dir = demo_workspace / "documents" / "project_a"
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doc2_dir = demo_workspace / "documents" / "project_b"
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for doc_dir in [doc1_dir, doc2_dir]:
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doc_dir.mkdir(parents=True, exist_ok=True)
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# Project A uses logo.png and diagram.png
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(doc1_dir / "index.md").write_text("""# Project A
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This is Project A documentation.
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""")
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print("\n📁 Processing Project A assets...")
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deduplicator.add_asset(test_image1, doc1_dir, "logo.png")
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deduplicator.add_asset(test_image3, doc1_dir, "diagram.png")
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# Project B uses the same logo (different filename) and same diagram
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(doc2_dir / "index.md").write_text("""# Project B
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This is Project B documentation.
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""")
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print("\n📁 Processing Project B assets...")
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deduplicator.add_asset(test_image2, doc2_dir, "company_logo.png") # Same content as logo.png
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deduplicator.add_asset(test_image3, doc2_dir, "system_diagram.png") # Same content as diagram.png
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# Show deduplication results
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print(f"\n📊 Deduplication Results:")
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print(f" - Original files: 3")
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print(f" - Unique content hashes: {len(deduplicator.registry.registry['assets'])}")
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print(f" - Storage efficiency: {3 - len(deduplicator.registry.registry['assets'])} duplicates eliminated")
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# Create packages
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print(f"\n📦 Creating packages...")
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pkg_a = packager.create_package(doc1_dir, "project_a")
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pkg_b = packager.create_package(doc2_dir, "project_b")
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print(f"\n✅ Demo completed successfully!")
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print(f" - Workspace: {demo_workspace}")
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print(f" - Shared assets: {deduplicator.shared_assets}")
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print(f" - Packages: {packager.packages_dir}")
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# Show final directory structure
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print(f"\n📂 Final directory structure:")
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for root, dirs, files in os.walk(demo_workspace):
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level = root.replace(str(demo_workspace), '').count(os.sep)
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indent = ' ' * 2 * level
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print(f"{indent}{os.path.basename(root)}/")
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subindent = ' ' * 2 * (level + 1)
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for file in files:
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file_path = Path(root) / file
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if file_path.is_symlink():
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target = os.readlink(file_path)
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print(f"{subindent}{file} -> {target}")
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else:
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print(f"{subindent}{file}")
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if __name__ == "__main__":
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demo_asset_management()
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