fascia

Version: 0.1.1

fascia is a thin command-line REPL wrapper around the Rust crate evalexpr. It provides a simple interactive interface for evaluating expressions, defining variables, and creating functions.

The goal is to expose evalexpr functionality through a clean CLI without unnecessary abstractions.

Features

• Interactive expression evaluation
• Variable definitions (var / let)
• User-defined functions
• Built-in math, trigonometric, and logarithmic functions
• Minimal overhead (delegates evaluation to evalexpr)
• MIT licensed

Installation

Via Cargo

cargo install fascia

Via Git/Source

git clone <https://github.com/mcsamdev/fascia>
cd fascia
cargo install --path . --locked --force

Usage

To start the repl simply run fascia in the terminal.

Commands

Calculator Commands: ─────────────────────────────────────────────────────────────

• <expression> Evaluate an expression directly
• var <name> = <expr> Define a variable
• let <name> = <expr> Define a variable (alias)
• func <name>(<args>) -> <expr> Define a function
• list Show all variables and functions
• help Show this help message
• quit / exit Exit the calculator

Built-in Functions

• Math: abs, floor, round, ceil, pow(x, y), min(a, b), max(a, b)
• Trig: sin, cos, tan, asin, acos, atan, sinh, cosh, tanh
• Logs: sqrt, exp, ln, log2, log10
• Constants: pi, e

Examples

sqrt(16)
sin(pi / 2)
pow(2, 8)

var x = 10
x * 3

func double(n) -> n * 2
double(5)

func sqr(x) -> sqrt(x)

Cli Flags

--help or -h or help Show help information --version or -v or version Show version information bench Time expression evaluation in microseconds