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Quillmark: Python bindings

Python bindings for Quillmark, a schema-driven document engine.

Maintained by TTQ.

Installation

pip install quillmark

The package is typed: it ships py.typed and stubs for the whole surface.

Quick Start

from quillmark import Quillmark, Quill, Document, OutputFormat

engine = Quillmark()                       # backend registry + render dispatcher
quill = Quill.from_path("path/to/quill")   # portable, declarative config data

markdown = """~~~
$quill: my_quill
$kind: main
title: Hello World
~~~

# Hello
"""

parsed = Document.from_markdown(markdown)
result = engine.render(quill, parsed, OutputFormat.PDF)
result.artifacts[0].save("output.pdf")

API surface

Field I/O flows through quill.writer(doc) and quill.reader(doc), the schema-bound write/read front doors. Document carries the quill-free surface: parse, storage, structure, $ext / $seed, and remove_field. Names follow snake_case, and the shared model (the Document / Card shapes, Diagnostics, the storage DTO) is identical to @quillmark/wasm's.

Quillmark

engine = Quillmark()
engine.registered_backends()              # ['typst', 'acroform'] (order not guaranteed)
engine.render(quill, parsed, OutputFormat.PDF)   # ppi=, pages=, regions= optional
                                          # today=datetime.date, default the local date
engine.supported_formats(quill)           # [OutputFormat.PDF, ...] (raises if backend unregistered)

Quill

quill = Quill.from_path("path/to/quill")  # pure config load: no backend resolved here

quill.backend_id            # "typst" (declared backend)
quill.blueprint             # auto-generated annotated Markdown blueprint
quill.schema                # structured dict of the quill's document schema
quill.metadata              # `name`, `version`, `backend`, `author`, `description`, extras sorted
quill.quill_ref             # "name@version"

doc     = quill.parse(markdown)           # the bound door: parse + conform, the primary ingestion path
diags   = quill.conform(doc)              # the same walk in place on a transported document ([] = at rest)
diags   = quill.validate(parsed)          # list of validation::* diagnostic dicts ([] = valid)
empty   = quill.empty_document()          # the empty Document: $quill + $kind: main, nothing committed
seed    = quill.seed_document()           # starter Document: one card per kind, each its kind's seed
example = quill.example_document()        # the quill's made-up filled-in page (example.md), pinned; None without one
main    = quill.seed_main()               # just the $kind: main card (dict, like doc.main)
card    = quill.seed_card("note")         # one starter composable card (dict), None if kind undeclared

writer  = quill.writer(doc)               # schema-bound typed write front door
reader  = quill.reader(doc)                 # schema-bound interpreted read front door

Writer: quill.writer(doc)

Resolves each field's type from the bound quill, so a name the schema does not declare is a typo (UnknownField), not a fallback. Holds both handles by reference and owns neither: bind, write, discard.

w = quill.writer(doc)
w.set("title", "On Taro")                 # typed-commit one field (mismatch raises now)
w.set_all({"title": "T", "author": "A"})  # atomic batch; one diagnostic per bad field
w.revise_body("A **taro** essay.")        # body write (edit semantics; a body has no field schema)
w.revise_field("bio", "make it **bold**") # typed *and* anchor-preserving content write (codec by declared type)
w.add_card("quotes", {"author": "Basho"}, "…", at=None)  # make + typed commit + insert (at appends/inserts)
w.remove_card(0)
w.set("author", "Issa", card=0)           # every verb takes card=: None is main, an int the composable card

Reader: quill.reader(doc)

The read twin of Writer. get reads each field in the values form: every content leaf in its type tree as its codec's text (a richtext leaf to markdown, a plaintext leaf to its literal text), everything else as stored, never coerced. get_content is the same read at the other end of the codec, handing back the field's Content as a dict whichever lane stored it.

v = quill.reader(doc)
v.get("bio")                              # richtext → markdown str; scalar → as stored; absent or present-null → None
                                          # undeclared name raises UnknownField; undecodable content raises FieldDecode
v.get_content("bio")                      # the `Content` dict {text, lines, marks, islands}; absent → None
                                          # a type that is not a content leaf raises FieldNotContent
v.body_markdown()                         # the main body markdown (quill-free body read)
v.get("author", card=0)                   # a card field, interpreted by its $kind schema
v.body_markdown(card=0)
doc.card(0)["kind"]                       # the composable card's $kind

RenderResult / Artifact

result.artifacts            # [Artifact, ...]
result.warnings             # [Diagnostic, ...]: parse, then quill.validate, then compile
result.format               # OutputFormat

artifact.format             # OutputFormat
artifact.bytes              # bytes
artifact.mime_type          # 'application/pdf', 'image/svg+xml', ...
artifact.save("out.pdf")

Document

doc = Document("my_quill")                       # blank canvas: $quill only, no fields, no cards
doc = Document.from_markdown(markdown)
emitted = doc.to_markdown()

stored   = doc.to_stored()
restored = Document.from_stored(stored)

Document.storage_version_of(blob)                # raw tag (incl. unknown futures); None when not a DTO
Document.current_storage_version()               # what this build writes

Document.markdown_rules()                        # Quillmark Markdown rules (static text)
Document.quill_ref_hint()                        # $quill reference grammar (static text)

doc.clone()
doc.equals(other)
doc.card_count
doc.main; doc.cards; doc.body; doc.warnings      # total-read snapshots (dicts); body is a content dict
doc.card(0)                                      # one card, same dict shape as main (out of range raises)
doc.seed_overlay("note")                         # one $seed[kind] overlay, or None
doc.set_quill_ref("other@1.0")

# Structure (quill-free, a card kind is a name, not a schema fact):
doc.insert_card({"kind": "note", "body": "..."}, at=None)   # at appends/inserts
doc.insert_card({"kind": "note",                            # fields → payload items
                 "payload_items": [{"type": "field", "key": "x", "value": 1}]})
doc.remove_card(0)                               # returns the Card dict, or None
doc.move_card(2, 0)
doc.remove_field("title")                        # remove has no lane; card=i targets a composable card

# Out-of-band consumer state (never rendered):
doc.store_ext({"agent": {"pinned": True}})       # whole $ext map; card=i for a composable card
doc.store_ext({**doc.main["ext"], "agent": {"n": 1}})   # one namespace: merge, then store
doc.remove_ext()                                 # every namespace at once
doc.store_seed_overlay("note", {"tag": "T"})     # per-kind $seed overlay; new cards spawn with it
doc.remove_seed_overlay("note")

Setting a field's value is the writer's job (quill.writer(doc).set(...)): a field write needs the schema, and Document is quill-free. Reading a field's interpreted value is the reader's (quill.reader(doc).get(...)).

Schema model

A field declares no required: key on FieldSchema: nothing is required.

default: — what an unanswered field renders. With one, the blueprint renders that value under a type-only # <type> annotation and the render path uses it when the document omits the field. Without one, the blueprint leaves the cell empty and an absent field blank-fills.

An unanswered field draws no diagnostic. Partial documents are accepted, and engine.render(quill, doc) raises only for malformed input.

Error contract

An engine refusal raises QuillmarkError, carrying a non-empty .diagnostics list of Diagnostic objects. An argument the binding cannot read at all — a non-finite float, a value with no JSON form, a malformed path sequence — raises ValueError before the engine is called, described by no diagnostic.

try:
    Document.from_markdown(bad_md)
except QuillmarkError as exc:
    for d in exc.diagnostics:
        print(d.severity, d.code, d.message, d.path)
        print(str(d))   # canonical pretty-printed text (matches CLI / WASM)

Mutator failures (invalid field names, kind names, out-of-range indices) carry a namespaced edit::* code on diagnostics[0]: edit::invalid_field_name, edit::unknown_field, edit::index_out_of_range, edit::field_coercion_failed, …. insert_card refuses a card's contents under those same codes. Route on diagnostics[0].code, never on message text.

Card and page indices count from the front, so a negative one addresses nothing rather than the last card or page: it takes the same answer as an index past the end — edit::index_out_of_range where the verb raises, None where remove_card answers absence.

Each refusal anchors at a rooted document path: main.<field> for a main field, cards.<kind>[<i>].<field> for a card field, cards[<i>] for a structural out-of-range op.

Changelog

See the changelog and the GitHub Releases page for release notes and version history.

Development

uv venv
source .venv/bin/activate
uv pip install maturin pytest
maturin develop
pytest

maturin develop builds the extension in the debug profile. Stay in the activated venv: uv sync, uv run, and pip install -e each sync the project through maturin's PEP 517 backend, a release build that replaces the debug .so.

python/quillmark/_quillmark.pyi is hand-written and must track src/. No CI job gates it, so after changing the surface run the stub against the built module yourself:

uv pip install mypy
python -m mypy.stubtest --ignore-disjoint-bases quillmark

License

Apache-2.0

Metadata

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