add show method

Author: dkarrasch

src/show.jl

@@ -39,6 +39,9 @@ end
 function _show(io::IO, A::ScaledMap{T}, i) where {T}
     " with scale: $(A.λ) of\n" * map_show(io, A.lmap, i+2)
 end
+function _show(io::IO, A::FillMap{T}) where {T}
+    println(io, " with fill value: $(A.λ)")
+end
 
 # helper functions
 function _show_typeof(A::LinearMap{T}) where {T}

test/fillmap.jl

@@ -6,6 +6,7 @@ using LinearMaps, LinearAlgebra, Test
     for λ in (true, false, 3, μ, μ + 2im)
         L = LinearMap(λ, (M, N))
         @test L == LinearMap(λ, M, N)
+        @test occursin("$M×$N LinearMaps.FillMap{$(typeof(λ))}", sprint((t, s) -> show(t, "text/plain", s), L))
         @test LinearMaps.MulStyle(L) === LinearMaps.FiveArg()
         A = fill(λ, (M, N))
         x = rand(typeof(λ) <: Real ? Float64 : ComplexF64, 3)