Physics Calculator

A simple program to calculate expressions with physical units.

This is a miniature version of some broader compiler/interpreter techniques, for fun/to help me learn C better.

Usage

See docs.

Develop

(Everything from the project's root directory. Assumes clang is installed.)

Run:

• Build + run: make
• With debug logs: make DEBUG=1

Test:

• Build + test: make test
• With debug logs: make test DEBUG=1
• Specific test case: make test test=3 case=4
• Disable spawning separate processes for each test/case: make test fork=0

Build to wasm:

• Download and install emscripten
• make wasm
• Serve files: python3 -m http.server --directory website
• Open http://localhost:8000

See the makefile for more info.

Contributors welcome!

To do

Things I'd like to do at some point:

• Add the rest of the of the SI units
• Add a bunch of builtin unit aliases like newtons, watts, mph
  • Somehow show results in simplified forms using unit aliases
  • Would be cool to add non-physics unit stuff like storage/memory sizes (bytes, kb, mb, gb, tb)
  • Other ideas: unitconverters.net
• Add a bunch of builtin constants like G, pi
• Support some more math/expressions like pow, log, parentheses
• Allow custom units/conversions - user can define a unit and it's conversion to an existing unit in some linear equation
• Syntax highlighting and autocompletion in the prompt
• BUG: Unit division of same category is broken, e.g. 60 s / 60 s/min should result in 1 min but instead results in 1 s