Unity version 0.1.0

v0.1.0 (2026-04-11)

Initial release.

Features

• NimbleParsec-based expression parser supporting integers, floats, rational numbers (1|3), unit names, arithmetic (+, -, *, /, ^, **), per, conversion (to, in, ->), parentheses, function calls, concatenated exponents (cm3), and juxtaposition multiplication (kg m).

• AST interpreter evaluating expressions against Localize.Unit and Localize.Unit.Math.

• Over 150 unit aliases mapping common abbreviations (m, km, ft, lb, mph, etc.) to CLDR unit identifiers, with fuzzy suggestions for unknown units via String.jaro_distance/2.

• Built-in functions: sqrt, cbrt, abs, round, ceil, floor, sin, cos, tan, asin, acos, atan, ln, log, log2, exp.

• Measurement system conversion targets: to metric, to us, to uk, to imperial, to SI, to preferred. The preferred keyword selects the measurement system appropriate for the current locale's territory.

• Variable bindings via let name = expression with subsequent reference by name.

• _ (underscore) references the previous REPL result for chained conversions.

• Mixed-unit decomposition: 3.756 hours to h;min;s → 3 hours, 45 minutes, 21.6 seconds.

• Locale-aware output via Localize.Unit.to_string/2 and Localize.Number.to_string/2. REPL locale command and CLI --locale flag for runtime locale switching.

• Interactive REPL with help, list, search, conformable, info, and locale commands. Command history persisted to ~/.units_history.

• CLI entry point supporting single-expression evaluation, two-argument GNU-style conversion, verbose (-v), terse (-t), exponential (-e), digits (-d), output-format (-o), strict (-s), and one-line (-1) modes, stdin piping, --conformable, and --list.

• Reciprocal conversion line shown by default for conversions (suppressed with --strict or --one-line).

• Formatter with default, verbose, and terse output modes.

• User-friendly error messages with parse position indicators and fuzzy unit suggestions.