Changelog

Added

• Safe modes for hay dist-update: --help and --check subcommands, argument validation with unit tests.
• English-only user-facing output: all error messages and printed strings translated to English. Mathematical notation preserved.
• Interpreter decomposition: interpreter.rs split into focused submodules (execution, eval_expr, dispatch, helpers, value, models). Reduced from ~4,800 to ~680 lines.
• for loop index/value binding: for i, v in list and for k, v in dict.
• try/catch/finally: finally block runs regardless of try outcome.
• hay install with version: install specific release tags.
• hay list shows versions from plugin metadata.
• match as contextual keyword: works as identifier and match expression.
• list_files() builtin: list_files(dir) and list_files(dir, pattern).
• ++ and -- operators: increment and decrement with desugaring to x = x + 1.

Changed

• quietly(expr) deprecated: use quietly on / quietly off instead.
• Validation runner exit semantics: non-zero exit on blocked cases unless --allow-blocked.
• data_source field added to validation cases.

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. Previously, append() produced empty strings for columns with repeated values (dates, tickers, sectors).
• Plugin resolution on Windows: HOME falls back to USERPROFILE. Searches executable directory. HAYASHI_PATH uses ; separator on Windows.
• Validation workflow: repaired validation.yml, added Greeners checkout.
• Clippy warnings: fixed empty_line_after_doc_comments, too_many_arguments, needless_range_loop.

Fixed

• CSV export column order: to_csv no longer sorts columns alphabetically. Insertion order preserved via IndexMap (replacing HashMap in Greeners).
• append() losing string columns: get_string() now handles Categorical columns. Previously, append() produced empty strings for any column with repeated values (dates, tickers, sectors).
• Plugin resolution on Windows: HOME falls back to USERPROFILE. Searches executable directory (exe_dir/, exe_dir/plugins/). HAYASHI_PATH uses ; as separator on Windows.

Added

• ++ and -- operators: increment and decrement.
• for i, v in list and for k, v in dict: index/value and key/value bindings.
• try/catch/finally: finally block runs regardless of try outcome.
• hay install with version: install specific release tags.
• hay list shows versions from plugin metadata.
• match as contextual keyword: works as identifier and match expression.
• list_files() builtin: list_files(dir) and list_files(dir, pattern).
• Interpreter decomposition: interpreter.rs reduced from ~4,800 to ~680 lines.
• English-only user-facing output: all error messages and printed strings in English.

Changed

• quietly(expr) deprecated: use quietly on / quietly off instead.
• Greeners 1.5.3: IndexMap for column order preservation, get_string handles Categorical.

Downloads

Added

• ++ and -- operators: increment/decrement with desugaring to x = x + 1.
• Greeners 1.5.1 dependency (crates.io, no path dependency).

Fixed

• Greeners dependency: uses greeners = "1.5.1" from crates.io in release builds.
• crossbeam-epoch advisory: updated to fix RUSTSEC advisory.

Added

• Hybrid plugin system: Native Rust (.so/.dll), WebAssembly (.wasm), and Script (.hay) tiers via unified HayashiPlugin trait.
• Pipe placeholder _: df |> ols(lw ~ yos, _) passes piped value to any argument position.
• ttest option unequal=false: pooled (equal-variance) t-test.
• Validation programme expanded to 40 cases: ridge, elasticnet, nbreg, oprobit, mlogit, SUR.
• Parametric-bootstrap SE for VECM with inference enabled.

Fixed

• Non-numeric columns in generate and estimators: to_float() instead of hard-failing on Boolean/Categorical columns.
• Hardened URL downloads (security, contributed by Charles Shaw): SSRF prevention, DNS rebinding protection, timeout and size limits.
• Clippy warnings fixed in Hayashi and Greeners.
• argmin updated to resolve RUSTSEC-2024-0384.

Changed

• ttest delegated to Greeners: interpreter is now a thin dispatcher.

Removed

• Unused anyhow dependency (contributed by Charles Shaw).

Added

• codebook(df): detailed variable description.
• Normality tests: swilk, sfrancia, sktest.
• mutate, group_by, pivot_longer, pivot_wider, select: pipe-friendly data manipulation.
• print() multi-arg: print(a, b, sep=", ").
• Improved error messages: source line preview, Levenshtein suggestions, stack traces.

Fixed

• Keywords followed by ( now parse as function calls.
• Parser line numbers correctly tracked after newlines.
• MomentHelpers exported from Greeners.

Added

• Operators: % (modulo), ** (power alias), compound assignment (+=, -=, *=, /=, %=).
• gmm(): two-step efficient GMM with Hansen J-test.
• cmnlogit(): conditional multinomial logit.
• help(about) and help(license).

Fixed

• Formula parsing unified: all 53 estimators accept bare and string formulas.

Fixed

• Scalar math functions: sqrt(), abs(), ln(), exp(), pow(), sin(), cos(), tan(), ceil(), floor(), round(), sign(), factorial(), normalden(), invnormal(), max(), min() now work as standalone expressions.

Breaking Changes

• Extension: .hy → .hay
• Binary: hayashi → hay
• Namespaced imports: import("mod") → mod::func()

Added

• CI/CD: GitHub Actions with fmt, clippy, test on Linux/macOS/Windows; release workflow for 4 targets.
• Namespaces: import("mod", as=alias), import("mod", only=["f"]).
• REPL: tab completion, syntax highlighting, colored prompt, fish-style history hints.
• Date/time: date(), datetime(), year(), month(), day(), hour(), dow().
• Collinearity detection: QR-based across 9 estimators with Stata-style (omitted) display.
• VS Code extension 0.2.0.

Fixed

• Stack overflow on Windows/macOS: 32 MB stack for main thread.
• Cross-platform tests: std::env::temp_dir() replaces hardcoded paths.
• Package manager: correct user/repo/ directory structure.

Initial Release

• 46 estimators: OLS, IV, Logit, Probit, Poisson, NegBin, Tobit, Heckman, FE, RE, Arellano-Bond, System GMM, ARIMA, GARCH, VAR, VECM, Lasso, Ridge, DID, RD, Cox, Fama-MacBeth, and more.
• Stata-like syntax with closures, pipe, match, f-strings, try/catch.
• 8 I/O formats: CSV, TSV, JSON, DTA, Excel, Parquet, SQLite, ODBC.
• Plugin system with package manager (hay install).
• Post-estimation: test, nlcom, margins, bootstrap, esttab, vif, hausman, predict.
• 387 tests, 59 examples, ~110 help topics.
• 100% Rust — no C, no Fortran, no system BLAS/LAPACK.