add recipe for series on Plots v2 (#4941)

* add recipe

* add import

* handle errorbars, add tests

* improve test

* simplify test

* fix test

PlotsBase/src/DataSeries.jl

@@ -21,17 +21,27 @@ export get_linestyle,
     get_markercolor,
     get_markeralpha
 
+import Base.show
 import ..Commons: get_gradient, get_subplot, _series_defaults
 import ..PlotsBase
 
 using ..PlotsBase: DefaultsDict, RecipesPipeline, get_attr_symbol, KW
 using ..PlotUtils: ColorGradient, plot_color
+using ..RecipesBase: @recipe
 using ..Commons
 
 mutable struct Series
     plotattributes::DefaultsDict
 end
 
+@recipe function f(s::Series)
+    for (k, v) in s.plotattributes
+        k in (:subplot, :yerror, :xerror, :zerror) && continue
+        plotattributes[k] = v
+    end
+    ()
+end
+
 Base.getindex(series::Series, k::Symbol) = series.plotattributes[k]
 Base.setindex!(series::Series, v, k::Symbol) = (series.plotattributes[k] = v)
 Base.get(series::Series, k::Symbol, v) = get(series.plotattributes, k, v)

PlotsBase/test/test_recipes.jl

@@ -20,6 +20,12 @@ using OffsetArrays
     end
 end
 
+@testset "Series" begin
+    pl = plot(1:3, yerror = 1)
+    @test plot(pl[1][1])[1][1][:primary] == true
+    @test plot(pl[1][2])[1][1][:primary] == false
+    @test isequal(plot(pl[1][2])[1][1][:y], pl[1][2][:y])
+end
 @testset "lens!" begin
     pl = plot(1:5)
     lens!(pl, [1, 2], [1, 2], inset = (1, bbox(0.0, 0.0, 0.2, 0.2)), colorbar = false)