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
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. The opaque field
store and the anchor-preserving content lane are WASM-only by scope, as are the
render session and canvas preview; Python renders in one shot via
engine.render. Names follow snake_case, and the shared model (the Document
/ Card shapes, Diagnostics, the storage DTO) is identical to
@quillmark/wasm's.
A Quill is portable, declarative config data, and quill.metadata a pure,
infallible snapshot of the quill: section. The engine resolves the declared
backend, so only the format probe (supported_formats) and render raise
engine::backend_not_found.
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"
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)
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)
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.card(0).set("author", "Issa") # a CardWriter: .index, .kind, .set, .set_all, .revise_body, .revise_field
Reader: quill.reader(doc)
The read twin of Writer. get reads each field by its declared type: a
richtext field to its markdown projection, a plaintext field to its literal text,
every other type verbatim. 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 → its value; absent → 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.card(0).kind # the composable card's $kind
v.card(0).get("author") # a card field, interpreted by its $kind schema
v.card(0).body_markdown()
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.storage_version_of(blob) # raw tag (incl. unknown futures)
Document.current_storage_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.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_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 carries two independent axes, and no required: one on FieldSchema.
Value — what the cell holds. With a default:, 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, an example takes the cell as a
suggested value, and an absent field blank-fills.
Obligation — whether a human must author the field, read off default:'s
absence: a defaulted field asks nobody, a defaultless one asks. An obliged
field carries the !must_fill marker in the blueprint, and validation emits the
non-fatal validation::must_fill warning while the document leaves it
unauthored — from either of two triggers, named by the diagnostic's trigger
arg: marker for a marker the document still carries, unauthored for a cell
the schema obliges and the document never filled. Authoring the field's blank
discharges the obligation; clearing the key does not.
Neither axis gates render. Partial documents are accepted, and
engine.render(quill, doc) raises only for malformed input.
Error contract
Every failure raises QuillmarkError, carrying a non-empty .diagnostics list
of Diagnostic objects.
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,
…. 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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