phie command line tool

[yegor256]

Let's create phie command line binary, which I can run like this:

$ cat > test.phie
ν0(𝜋) ↦ ⟦ 𝜑 ↦ ν3(𝜋) ⟧
ν1(𝜋) ↦ ⟦ Δ ↦ 0x002A ⟧
ν2(𝜋) ↦ ⟦ λ ↦ int-add, ρ ↦ 𝜋.𝛼0, 𝛼0 ↦ 𝜋.𝛼1 ⟧
ν3(𝜋) ↦ ⟦ 𝜑 ↦ ν2(ξ), 𝛼0 ↦ ν1(𝜋), 𝛼1 ↦ ν1(𝜋) ⟧
ν5(𝜋) ↦ ⟦ 𝜑 ↦ ν3(ξ) ⟧
$ phie foo.phie
84

It will take the input from the file provided, pass it to Emu::from_str and then dataize and print out the result.

[yegor256]

@Karina5005 try this one, using "reo" as a sample. Also, try to move slowly in small increments, using PDD methodology.