libcuj · cuj as a Python library

cuj — n. Clever Use of Jots — is a plain-text PKM engine: one-line captures, inline Jot Syntax annotations (tags, hierarchical categories, labeled references, todos with due dates), a content-addressed fact store underneath, and importers for Evernote (.enex) and Obsidian vaults. Your notes stay plain text; the engine makes them answer questions.

This package (pip install libcuj) binds cuj into Python as import cuj — the library only. The cuj command-line tool is its sibling distribution: pip install cuj (prebuilt binary) or cargo install cuj (from source). What the first release exposes is the vault's query surface — the library twin of the cuj q command, running Quarb over the vault in-process:

import cuj

# The open todo list, due dates as data.
cuj.q("//*<todo && open> | rec(::description, ::due)")
# [{'description': 'buy primus spares', 'due': None},
#  {'description': 'renew NZ transit visas',
#   'due': datetime.datetime(2026, 6, 15, ...)}, ...]

# Who cites note 3 - and who contradicts it.
cuj.q("/default/3<-cites::summary")
cuj.q("/default/3<-contradicts::summary")

# Notes sharing a tag with note 14 but not linked to it.
cuj.q("/default/14 . <-tagged->tagged"
      "[::::id != (1)::::id][!--*[::::id = (1)::::id]]::summary")

Node results return as cuj's own display strings (--default--12, ///wiki/note.md, ..tag); value results as typed Python values — int, float, tz-aware datetime, timedelta, dicts for records, quantities as their written face ("204.808 kB").

Keyword arguments mirror the CLI's flags:

cuj.q(expr,
      config="~/vaults/field/config.toml",  # else CUJ_CONFIG / ~/.cuj
      profile="all",                        # widen across profiles
      at="~8",                              # a historical state
      now="2026-07-31T12:00:00Z")           # pin now() - reproducible

Errors raise ValueError with cuj's or the engine's message.

The vault itself is made with the cuj CLI (pip install cuj or cargo install cuj) — capture, import, label, promote; reading is the engine's job, actions are the tool's. The data model and protocol are documented from cuj.net; the query language in the Quarb spec.

License: MIT OR Apache-2.0.

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libcuj 0.3.2

libcuj · cuj as a Python library

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