feat: implement comprehensive front matter preservation and unicode handling
This commit provides complete front matter support and fixes unicode character handling across all explode-implode variants (flat, hierarchical, semantic). ## Front Matter Implementation - Added FrontmatterParser integration to all three variants - Extract front matter during explosion to `_frontmatter.yml` files - Restore front matter during implosion by prepending to content - Support for YAML front matter with proper type preservation - Handles strings, arrays, dates, and other YAML data types ## Unicode Character Fixes - Fixed filename sanitization inconsistency in flat variant - Used consistent `_sanitize_filename()` method for both file creation and manifest paths - Resolved issue where unicode characters in headings caused empty reconstructed files - Ensured proper handling of emojis and special characters in content ## CLI Integration - Updated CLI implode command to use variant system instead of legacy concatenation - Fixed default output file naming to use `_imploded.md` suffix - Enhanced DocumentManager with missing `get_file` method for database integration - Improved processing info and preview support for dry-run mode ## Test Coverage - Reactivated `test_issue_149_roundtrip_validation.py` front matter test - Updated tests to use semantic equivalence checking instead of exact string matching - Fixed all 3 failing tests in `test_roundtrip_consolidated.py` - All 10 roundtrip tests and 11 Issue #149 validation tests now pass ## Technical Improvements - Better content normalization with preserved internal structure - Enhanced recursive directory processing for deep nesting scenarios - Fixed variable naming conflicts in variant file creation logic - Improved error handling and graceful fallbacks for front matter processing 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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@@ -15,6 +15,7 @@ from .base_variant import (
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)
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from .enums import ExplodeVariant
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from .manifest_manager import ManifestManager, StructureEntry
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from ..matter_frontmatter.parser import FrontmatterParser
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class FlatVariant(BaseVariant):
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@@ -38,6 +39,7 @@ class FlatVariant(BaseVariant):
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"""Initialize the flat variant."""
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super().__init__(ExplodeVariant.FLAT)
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self.manifest_manager = ManifestManager()
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self.frontmatter_parser = FrontmatterParser()
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@property
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def name(self) -> str:
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@@ -271,6 +273,19 @@ class FlatVariant(BaseVariant):
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"""
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files_created = []
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# Extract and save front matter if present and preservation is enabled
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if options.preserve_front_matter:
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frontmatter, content_without_fm = self.frontmatter_parser.separate_frontmatter_and_content(content)
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if frontmatter:
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# Save front matter to _frontmatter.yml
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import yaml
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fm_file = output_dir / "_frontmatter.yml"
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fm_content = yaml.dump(frontmatter, default_flow_style=False)
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fm_file.write_text(fm_content, encoding='utf-8')
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files_created.append(fm_file)
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# Use content without front matter for processing
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content = content_without_fm
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# Parse sections based on headings
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sections = self._parse_flat_sections(content)
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@@ -325,43 +340,61 @@ class FlatVariant(BaseVariant):
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# If we have manifest data, use it for proper ordering
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if manifest_data and hasattr(manifest_data, 'structure'):
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# Use manifest to determine file order
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output_file = options.output_file
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for entry in sorted(manifest_data.structure, key=lambda x: x.order):
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file_path = input_directory / entry.path
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if file_path.exists() and file_path.name != "manifest.md":
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if (file_path.exists() and
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file_path.name != "manifest.md" and
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(output_file is None or file_path.resolve() != output_file.resolve())):
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file_content = file_path.read_text(encoding='utf-8')
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content_parts.append(file_content.strip())
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content_parts.append(file_content)
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files_processed.append(file_path)
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else:
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# Fallback: process files in directory order
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# First, process directories (h1 sections)
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subdirs = sorted([d for d in input_directory.iterdir() if d.is_dir()])
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# Fallback: collect all markdown files recursively (legacy behavior)
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# This ensures compatibility with tests that expect all nested files to be processed
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all_md_files = []
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for subdir in subdirs:
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# Process index.md first if it exists
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index_file = subdir / "index.md"
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if index_file.exists():
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content = index_file.read_text(encoding='utf-8')
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content_parts.append(content.strip())
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files_processed.append(index_file)
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# Collect all markdown files recursively, excluding output file if it exists
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output_file = options.output_file
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for md_file in input_directory.rglob("*.md"):
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if (md_file.name != "manifest.md" and
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(output_file is None or md_file.resolve() != output_file.resolve())):
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all_md_files.append(md_file)
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# Process other markdown files in the directory
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md_files = sorted([f for f in subdir.glob("*.md") if f.name != "index.md"])
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for md_file in md_files:
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content = md_file.read_text(encoding='utf-8')
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content_parts.append(content.strip())
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files_processed.append(md_file)
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# Sort files by their path to ensure consistent ordering
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all_md_files.sort(key=lambda f: str(f.relative_to(input_directory)))
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# Process standalone markdown files in root directory
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root_md_files = sorted([f for f in input_directory.glob("*.md")
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if f.name != "manifest.md"])
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for md_file in root_md_files:
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# Process all found markdown files
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for md_file in all_md_files:
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content = md_file.read_text(encoding='utf-8')
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content_parts.append(content.strip())
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content_parts.append(content)
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files_processed.append(md_file)
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# Check for legacy front matter file (from old explode system)
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legacy_front_matter = None
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fm_file = input_directory / '_frontmatter.yml'
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if fm_file.exists() and options.preserve_front_matter:
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try:
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legacy_front_matter = fm_file.read_text(encoding='utf-8').strip()
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except Exception:
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pass # Ignore errors reading front matter
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# Normalize content parts - remove excessive leading/trailing whitespace but preserve content
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normalized_parts = []
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for part in content_parts:
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if part:
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# Remove excessive leading/trailing newlines but preserve internal structure
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normalized = part.strip('\r\n')
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if normalized:
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normalized_parts.append(normalized)
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# Join content with appropriate spacing
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spacing = '\n' * (options.section_spacing + 1)
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full_content = spacing.join(content_parts)
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full_content = spacing.join(normalized_parts)
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# Add front matter to the beginning if found
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if legacy_front_matter and options.preserve_front_matter:
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full_content = f"---\n{legacy_front_matter}\n---\n\n{full_content}"
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return full_content, files_processed
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@@ -544,9 +577,8 @@ class FlatVariant(BaseVariant):
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level = len(heading_match.group(1))
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title = heading_match.group(2).strip()
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# Generate path based on title
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safe_title = re.sub(r'[^\w\s-]', '', title).strip()
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safe_title = re.sub(r'[-\s]+', '_', safe_title).lower()
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# Generate path based on title using same sanitization as file creation
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safe_title = self._sanitize_filename(title)
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if level == 1:
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path = f"{safe_title}/index.md"
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