evar

Welcome to evar, a feature-rich CLI calculator REPL! My goal was to create a modern, ergonomic, and simple calculator.

Features ✨

• Basic Math Functions: Perform essential mathematical operations.

  Supported operators: +, -, *, /, %, ^, !

  Supported functions:

  • Trigonometric Functions: sin, cos, tan, sec, csc, cot
  • Inverse Trigonometric Functions: asin, acos, atan
  • Hyperbolic Functions: sinh, cosh, tanh
  • Exponential and Logarithmic Functions: sqrt, exp, exp2, ln, log2, log10, log
  • Angle Conversion Functions: rad, deg
  • Rounding Functions: floor, ceil, round
  • Miscellaneous Functions: abs, log, ntroot

• Mathematical Notation: Write expressions like 2 sin(x) instead of 2 * sin(x).

  > 2sin(2pi/3)
  1.7320508075688774
  > 2 * sin(2 * pi / 3)
  1.7320508075688774
  > sqrt(3)
  1.7320508075688772
  

• Variable & Function Definition: Define your own variables and functions.

  > let x = 3
  3
  > let y = 10
  10
  > let f(z, w) = z + w
  > f(x, y)
  13
  

• Neat Error Handling: Easily understand errors.

  > let f(x) = 
  error: found end of input expected expression
    ┌─ <repl>:1:12
    │
  1 │ let f(x) = 
    │ ---------- ^ found end of input expected expression
    │ │          
    │ while parsing this function definition
  

• Persistent History: Keep a record of your calculations.

• Realtime Input Highlight: See your input highlighted as you type.

• Radian & Degrees Mode: Switch between radian and degrees mode.

• And More...

Inspiration 💡

evar is inspired by eva, another CLI calculator written in Rust.

Installation 🛠️

• crates.io

cargo install evar

• manual

git clone https://github.com/enklht/evar.git
cd evar
cargo run

Usage 🚀

Modern ergonomic math calculator inspired by eva

Usage: evar [OPTIONS]

Options:
  -a, --angle-unit <ANGLE_UNIT>  Angle Unit [default: radian] [possible values: radian,
 degree]
      --no-color                 Disable colored output
  -f, --fix <FIX>                Number of decimal places in output (0-63) [default: No
ne]
  -d, --debug                    Print parsed expression for debug purpose
  -h, --help                     Print help
  -V, --version                  Print version

Contributing 🤝

Contributions are welcome via GitHub.

License 📜

This project is licensed under the MIT License.