v0.2.9

What's new in 0.2.9

Formula system

• Arbitrary expressions in RHS terms: log(K), I(x^2), log(K):log(L) now work end-to-end
• Interactions between any expressions via : operator
• Readable coefficient names in output (log(K):log(L) instead of __inter_2)

Language

• F-strings parsed at parse-time (zero runtime reparse)
• expr_display covers all AST variants — no more silent _ for valid expressions

Robustness

• Eliminated all unjustified unwrap() calls in interpreter core
• env.rs, post_estimation_ts.rs, estimators_panel.rs, dispatch.rs hardened

Code quality

• exec() decomposed into 7 private methods — from 1366 to ~240 lines
• helpers.rs organised into 9 labelled sections

Validation programme (new)

• ~40 cases validated against R and Python on real datasets (Wooldridge, AER, statsmodels)
• All estimators pass: OLS, WLS, IV, Logit, Probit, Panel FE/RE, Poisson, NegBin, Tobit, Heckman, Cox, Quantile, ARIMA, VAR, VECM, GARCH, DiD, GMM, PSM, RDD, SUR, and more
• hay validate command runs the full programme locally

Dependencies

• Greeners 1.5.4 (preserves column insertion order, fixes get_string for Categorical columns)

What's Changed

• fix: update crossbeam-epoch advisory dependency by @shawcharles in #48
• docs: clarify validation reference semantics by @shawcharles in #46

Full Changelog: v0.2.8...v0.2.9

Nightly Build

Automated nightly build from the dev branch.

Not a stable release. May contain bugs and incomplete features.
Use hay dist-update --nightly to install, or download manually below.

Build date:
Commit: 36d04b4

v0.2.9-beta.1

Pre-release (beta)

Fixed

• CSV export column order: to_csv no longer sorts columns alphabetically. Insertion order preserved via IndexMap.
• append() losing string columns: get_string() now handles Categorical columns.
• Plugin resolution on Windows: HOME falls back to USERPROFILE. Searches executable directory. HAYASHI_PATH uses ; on Windows.

Added

• ++ and -- increment/decrement operators
• for i, v in list and for k, v in dict bindings
• try/catch/finally with finally block
• hay install with version, hay list shows versions
• match as contextual keyword
• list_files() builtin
• Interpreter decomposition (~4800 → ~680 lines)
• English-only user-facing output

Not published to crates.io. Binary-only pre-release for testing.

v0.2.8

What's new

• WebAssembly playground: full Hayashi interpreter runs in the browser with syntax highlighting, live output capture, and example snippets
• Increment/decrement operators: x++ and x-- desugar to x = x + 1 and x = x - 1
• Static site: landing page, docs, plugins, community, and playground pages
• Privacy: no cookies, no tracking, no external dependencies beyond Google Fonts

Dependencies

• Greeners 1.5.2 (fixes RUSTSEC-2026-0204: crossbeam-epoch vulnerability)

Install

git clone https://github.com/sheep-farm/hayashi.git
cd hayashi
cargo build --release
./target/release/hay --version

What's Changed

• validation: align tobit_mroz with AER reference by @shawcharles in #44

Full Changelog: v0.2.7...v0.2.8

v0.2.7

What's Changed

• validation: add focused runner CLI by @shawcharles in #37

Full Changelog: v0.2.6...v0.2.7

v0.2.6

What's Changed

• fix: harden URL downloads by @shawcharles in #11
• chore: remove unused anyhow dependency by @shawcharles in #13
• ci: restore format check and Windows smoke test by @shawcharles in #15
• fix: handle user-reachable panic paths by @shawcharles in #20
• docs: add trust model for SQL and remote data by @shawcharles in #18
• refactor: add command metadata help registry by @shawcharles in #22
• fix: avoid non-finite label comparison panics by @shawcharles in #24
• fix: standardise initial user-facing errors by @shawcharles in #27
• ci: add dependency advisory policy by @shawcharles in #16

Full Changelog: v0.2.5...v0.2.6

What's Changed

• fix: harden URL downloads by @shawcharles in #11
• chore: remove unused anyhow dependency by @shawcharles in #13
• ci: restore format check and Windows smoke test by @shawcharles in #15

Full Changelog: v0.2.5...v0.2.6

v0.2.5

Full Changelog: v0.2.4...v0.2.5

v0.2.4

Full Changelog: v0.2.3...v0.2.4

v0.2.3-patch.202601

Full Changelog: v0.2.3...v0.2.3-patch.202601

v0.2.3

Full Changelog: v0.2.2...v0.2.3