Rust dice-roller

A CLI application that rolls arbitrary combinations of dice and sums up their values.

• dice-roller takes no command line arguments
• the syntax for rolling dice is <number>d<sides> e.g. rolling three 20-sided dice would be 3d20
• you can combine any amount of different dice. 1d20 4d4 would roll one 20-sided die and four 4-sided dice
• the separator doesn't matter. You can write 1d20+4d4 or 1d20,4d4 etc. as long as you don't use d or a number as a separator
• up and down arrows let you quickly go through your roll history to reroll a certain combination or tweak it slightly