Josep Bigorra created OrgWebAlchemy, a Guile Scheme library that parses Org-mode documents with Parsing Expression Grammars (PEG, via ice-9 peg) into an AST and renders them to HTML using SXML. Motivated by the fragility of ad-hoc regex approaches, the project expresses grammar rules as S-expressions (or traditional PEG syntax) so the grammar itself reads like language documentation. The pipeline is Org -> PEG -> AST -> SXML -> HTML, and supports headings, paragraphs, unordered/ordered/description lists, inline markup (italic, bold, code), links (with descriptions), tables, separators, source/example/quote blocks, and raw HTML export blocks that bypass inline parsing. Code and tests are on Codeberg; the author notes AI-assisted debugging but emphasizes handcrafted implementation and unit tests.
Concrete design choices include producing a flat sequence of list items from the PEG and then transforming indentation into a nested list tree during AST processing, which yields proper nested HTML lists; one remaining bug concerns mixing different list types. Representing HTML as SXML keeps rendering flexible and customizable via Guile parameters (including per-heading class functions). The project is LGPLv3-licensed, has a test suite, aims for Guix packaging, and invites feedback on grammar, AST design, parser architecture and missing Org constructs.
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