Create Model struct

src/Model.jl

@@ -0,0 +1,33 @@
+using Crayons
+
+"""
+Type for a stock-flow consistent model.
+"""
+mutable struct Model
+    endogenous_variables::Vector{Symbol}
+    exogenous_variables::Vector{Symbol}
+    parameters::Vector{Symbol}
+    math_operators::Set{Symbol}
+    equations::Vector{Expr}
+    f!::Function
+end
+
+Model() = Model(Symbol[], Symbol[], Symbol[], math_operators, Expr[], x -> nothing)
+
+const math_operators = Set([:+, :-, :*, :/, :÷, :\, :^, :%])
+const name = [:diff, :endos, :lags, :exos, :params]
+
+function Base.show(io::IO, m::Model)
+    descriptors = ["Endogenous Variables: ", "Exogenous Variables: ", "Parameters: ", "Equations: "]
+    max_width = maximum(length.(descriptors))
+    for i in eachindex(descriptors)
+        descriptors[i] = descriptors[i] * ' '^(max_width - length(descriptors[i]))
+    end
+    print(io, Crayon(foreground = :green), descriptors[1]); println(io, Crayon(reset=true), m.endogenous_variables)
+    print(io, Crayon(foreground = :yellow), descriptors[2]); println(io, Crayon(reset=true), m.exogenous_variables)
+    print(io, Crayon(foreground = :blue), descriptors[3]); println(io, Crayon(reset=true), m.parameters)
+    print(io, Crayon(foreground = :red), descriptors[4]); print(io, Crayon(reset=true))
+    for i in 1:length(m.equations)
+        print(io, "\n", ' '^max_width, "($i)  ", m.equations[i])
+    end
+end