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, so
mypy, Pyright, and IDE completion see real signatures rather than Any.
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
Python is a Tier-1 binding: 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. There is no opaque field store and no anchor-preserving content
lane (install / revise / apply_change + the import_markdown /
export_markdown / rebase / map_pos codec); those are WASM-only by scope,
serving live editors that Python does not target. See
prose/canon/BINDINGS.md.
Names follow snake_case; the shared model (the Document / Card shapes,
Diagnostics, the storage DTO) is identical to the
@quillmark/wasm package's. Python renders in one shot via
engine.render; the iterative render-session and canvas-preview surface is
WASM-only (see prose/canon/PREVIEW.md).
Capability principle: a Quill is portable, declarative config data,
quill.metadata is a pure, infallible snapshot of the quill: section.
The format probe (supported_formats) and rendering (render) are resolved
by the engine, against a quill; they raise QuillmarkError
(code engine::backend_not_found) only if the declared backend isn't
registered.
Quillmark
engine = Quillmark()
engine.registered_backends() # ['typst', 'pdfform'] (order not guaranteed)
engine.render(quill, parsed, OutputFormat.PDF) # ppi=, pages=, producer= optional
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 # pure config snapshot of the quill: section (never raises)
quill.quill_ref # "name@version"
diags = quill.validate(parsed) # list of validation::* diagnostic dicts ([] = valid)
seed = quill.seed_document() # starter Document seeded from `example:` values
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)
The typed write front door. 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, ephemeral by convention: 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.set_body("A **taro** essay.") # typed body write (edit semantics)
w.revise_field("bio", "make it **bold**") # typed *and* anchor-preserving richtext write
w.add_card("quotes", {"author": "Basho"}, "…", at=None) # make + typed commit + insert (at appends/inserts)
w.remove_card(0)
w.card(0).set("author", "Issa") # a CardWriter: .index, .kind, .set, .set_all, .set_body, .revise_field
Reader: quill.reader(doc)
The interpreted read front door and the read twin of Writer. One get reads
each field by its declared type: a richtext field to its markdown projection,
every other type its canonical value verbatim.
v = quill.reader(doc)
v.get("bio") # richtext → markdown str; scalar → its value; absent → None
# undeclared name raises UnknownField; undecodable content raises FieldRichtextDecode
v.get_body() # the main body markdown (quill-free body read)
v.card(0).kind # the composable card's $kind
v.card(0).get("author") # a card field, interpreted by its $kind schema
v.card(0).get_body()
RenderResult / Artifact
result.artifacts # [Artifact, ...]
result.warnings # [Diagnostic, ...]
result.format # OutputFormat
result.render_time_ms # float
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_json()
restored = Document.from_json(stored)
maybe = Document.try_from_json(blob) # None when not a DTO
Document.schema_version_of(blob) # raw tag (incl. unknown futures)
Document.current_schema_version() # what this build writes
Document.format_rules() # card-yaml authoring rules (static text)
Document.quill_ref_hint() # $quill reference grammar (static text)
Document.blueprint_instruction("taro") # LLM/MCP blueprint header for a quill
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.card_index_by_id("intro") # the durable $id handle → index, or None
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(Document.make_card("note", {"x": 1}, "..."), at=None) # at appends/inserts
doc.remove_card(0) # returns the Card dict, or None
doc.move_card(2, 0); doc.set_card_kind(0, "summary")
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_namespace("agent", {"n": 1}) # one slot, siblings preserved; card=i too
doc.remove_ext_namespace("agent"); doc.remove_ext()
doc.store_seed_namespace("note", {"tag": "T"}) # per-kind $seed overlay; new cards spawn with it
doc.remove_seed_namespace("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's cell is inferred from whether the schema declares a default::
- Unendorsed (no
default:): the blueprint renders the!must_fillmarker (carrying the field'sexampleas a suggested value when one exists). An absent Unendorsed field zero-fills silently. A!must_fillmarker left in the document is non-fatal: it emits thevalidation::must_fillwarning and still renders. Partial documents are accepted;engine.render(quill, doc)only raises for malformed input. - Endorsed (with
default:): the blueprint renders the default value with a type-only# <type>annotation (shippable as-is), and the default is used when the document omits the field.
There is no required: axis on FieldSchema.
Error contract
A single exception type (QuillmarkError) is raised for every failure
mode. Every raised exception carries a non-empty .diagnostics list of
Diagnostic objects. This matches the WASM binding's contract.
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_conform, …:
the same taxonomy WASM uses. Route on diagnostics[0].code, never on message
text.
Changelog
See the changelog and the GitHub Releases page for release notes and version history.
Development
uv venv
uv pip install -e ".[dev]"
uv run pytest
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
uv run python -m mypy.stubtest --ignore-disjoint-bases quillmark
License
Apache-2.0
1 maintainer
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