add get_basis_names for massunivariate models (#208)

src/condense.jl

@@ -175,6 +175,28 @@ function get_basis_colnames(rhs::AbstractTerm)
     return colnames(rhs.basisfunction)
 end
 
+"""
+    get_basisnames(model::UnfoldModel)
+
+Return the basisnames for all predictor terms as a vector.
+
+The returned vector contains the name of the event type/basis, repeated by their actual coefficient number (after StatsModels.apply_schema / timeexpansion).
+If a model has more than one event type (e.g. stimulus and fixation), the vectors are concatenated.
+"""
+@traitfn function get_basis_names(m::T) where {T <: UnfoldModel; !ContinuousTimeTrait{T}}
+
+    # Extract the event names from the design
+    design_keys = first.((Unfold.design(m)))
+
+    # Create a list of the basis names corresponding to each model term
+    basisnames = String[]
+    for (ix, event) in enumerate(design_keys)
+        push!(basisnames, repeat([event], size(modelmatrix(m)[ix], 2))...)
+    end
+    return basisnames
+end
+
+
 @traitfn get_basis_names(m::T) where {T <: UnfoldModel; ContinuousTimeTrait{T}} =
     get_basis_names.(formulas(m))
 function get_basis_names(m::FormulaTerm)