daisy/TODO.md

• list and delete variables
• sin() with units (rad and deg)
• Prettyprint: no space when implicit multiply?
• Re-evaluate variables (a = q + 2, q = 3, a should evaluate to 5)
• Remove rug dependency (too big, incompatible)
• 2x^-1 as superscript

Pre-release

• Commands to list constants, units, and substitutions
• Documentation (usage)
• Documentation (comments)
• Print with highlighting
• Cleanup tests
  • Test commands
  • Test functions (nounit, tobase)
• Update README
  • demo
  • tricks (a = 2)

Parser rework

• Better error when sin = 2
• Define functions (f(x) = ??)
• Should functions be operators?

General

• Optional config file
• Optional history file
• Compile to WASM, publish a webapp
• Options:
  • disable replacement
  • disable special characters
  • 1/ as -1 power toggle
  • powers as superscripts toggle
• evaluate straight from command line
• Trigonometry & function tests
• Auto-push to crates.io

Internals

• Non-recursive treeify
• Faster factorial function. Maybe use gamma instead?
• Arbitrary precision float (rug doesn't offer arbitrary exponents)
• Backend-independent colorful printing

Math Features

• Function definitions
• Dice
• Mean, Median, Min, Max: arrays and multi-argument functions
• Arbitrary base logarithm
• Derivatives
• CAS features (trig, roots and powers)
• Complex numbers
• acot/acoth functions
• Binary, hex, octal numbers
• Extra roots? (for convenience)
• Sums and products
• Unit info command
• Constant info command

Prompt

• Live syntax/output (like firefox js terminal)
• Syntax highlight input and output
• fish-style tab completion
• Numbered expressions, history recall
• Better power printing
• Color configuration
• Enable/disable unit sets (defaults?)
• Show base units on error

Units

• long prefixes (megatonne, etc)
• HMS for degrees
• Exact radians, using pi constant?
• Weird units: flops, lumen, lux, bel
• Plural unit names