Helix Calc is a simple Reverse Polish Notation calculator.

It's written in Rust, using Ratatui for the cross-platform interface and bigdecimal-rs for the internal operations.

The name is inspired by Helix Editor, and the functionality by the venerable GNU dc.

This is a toy app that fulfills my personal needs, but I'm open to PR :)

Operations

• +, -, *, / : perform the arithmetic operation on the top two values.
• % : compute the modulo of the second value divided by the first.
• ^ : raise the second value to the power of the first.
• P : pop the top value off the stack.
• d : duplicate the top value.
• v : compute the square root of the top value.
• k : pop the top value and use it to set the precision.
• r : swap the first two values.
• u : undo the last operation.
• U : redo the last undone operation.
• [Up]: edit the value at the top of the stack.

Negative numbers

Two options to enter them:

• Type them as _123.
• Type them as 123- (careful, no space).

Limitations

By default, BigDecimal is compiled with a max precision of 100 digits: beyond that size, decimal places will be dropped, even if the integer part can handle much larger numbers.