More concise printing of some standard Range types

Fixes PainterQubits#199

src/display.jl

@@ -84,6 +84,20 @@ function show(io::IO, x::Type{T}) where T<:Unitlike
     invoke(show, Tuple{IO, typeof(x)}, IOContext(io, :showoperators=>true), x)
 end
 
+function show(io::IO, r::Union{StepRange{T},StepRangeLen{T}}) where T<:Quantity
+    a,s,b = first(r), step(r), last(r)
+    U = unit(a)
+    print(io, '(')
+    if ustrip(U, s) == 1
+        show(io, ustrip(U, a):ustrip(U, b))
+    else
+        show(io, ustrip(U, a):ustrip(U, s):ustrip(U, b))
+    end
+    print(io, ')')
+    has_unit_spacing(U) && print(io,' ')
+    show(io, U)
+end
+
 function show(io::IO, x::typeof(NoDims))
     print(io, "NoDims")
 end

test/runtests.jl

@@ -1188,6 +1188,11 @@ Base.show(io::IO, ::MIME"text/plain", ::Foo) = print(io, "42.0")
     # Angular degree printing #253
     @test sprint(show, 1.0°)       == "1.0°"
     @test repr("text/plain", 1.0°) == "1.0°"
+
+    # Concise printing of ranges
+    @test repr((1:10)*u"kg/m^3") == "(1:10) kg m^-3"
+    @test repr((1.0:0.1:10.0)*u"kg/m^3") == "(1.0:0.1:10.0) kg m^-3"
+    @test repr((1:10)*°) == "(1:10)°"
 end
 
 @testset "DimensionError message" begin