Long road to 4.0

[ikalnytskyi]

• frontmatter processor
  • use --- for YAML format (hugo/zola style)
  • use +++ for TOML format (hugo/zola style)
  • autodetect format
  • allow delimiter overwrite
  • auto detect YAML/TOML by delimiter
• commonmark processor
  • replace misletoe with markdown-it-py
  • support optional markdown-it-py extensions
• items refactoring
  • website item should be set on the application level
  • generators should be using the item class from application using some factory/clone function
  • items must be regular dictionaries
  • items should get a helper method to return URL (absolute and with hash trick)
• jinja processor
  • add filter/function to introduce "hashed" assets to overcome caching issue
• command processor
  • a processor that can invoke any command and acts as a passthrough
  • or maybe the result is used as a content? 🤔
• image processor
  • Use Pillow to resize or chance format
• git processor
  • get updated_at and created_at values from git
  • get author from git
• some processor to extract published date
• Some general blog processor that
  • Takes source directory as input
  • Takes output directory as input
  • Sets feed generation
  • Sets renderer engines
  • Uses frontmatter by default
  • Generates sitemap
  • Contains NO LOGIC, only invokes other processors
• Use dataclasses instead of mappings for the document models inside pipeline
• Set document model class in the configuration class (to support various use cases)
• Ensure that basic blog workflows is super simple and does not require dozens processors