rely less on Requires.jl

Project.toml

@@ -9,6 +9,7 @@ Observables = "510215fc-4207-5dde-b226-833fc4488ee2"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 AssetRegistry = "bf4720bc-e11a-5d0c-854e-bdca1663c893"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
+Mux = "a975b10e-0019-58db-a62f-e48ff68538c9"
 Distributed = "8ba89e20-285c-5b6f-9357-94700520ee1b"
 Widgets = "cc8bc4a8-27d6-5769-a93b-9d913e69aa62"
 JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
@@ -25,7 +26,6 @@ Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 DataStructures = "864edb3b-99cc-5e75-8d2d-829cb0a9cfe8"
 JSExpr = "97c1335a-c9c5-57fe-bc5d-ec35cebe8660"
 IJulia = "7073ff75-c697-5162-941a-fcdaad2a7d2a"
-Mux = "a975b10e-0019-58db-a62f-e48ff68538c9"
 Blink = "ad839575-38b3-5650-b840-f874b8c74a25"
 NBInclude = "0db19996-df87-5ea3-a455-e3a50d440464"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"

src/WebIO.jl

@@ -9,6 +9,8 @@ import Widgets: node, AbstractWidget
 using Logging
 using UUIDs
 using Base64
+using Mux
+using WebSockets
 
 include("../deps/bundlepaths.jl")
 
@@ -94,35 +96,16 @@ function prefetch_provider_file(basename)
   (file = filepath, code = code)
 end
 
-provider_mux = prefetch_provider_file("mux.jl")
-provider_blink = prefetch_provider_file("blink.jl")
+include("providers/mux.jl")
+include("providers/generic_http.jl")
+
 provider_ijulia = prefetch_provider_file("ijulia.jl")
-provider_generic_http = prefetch_provider_file("generic_http.jl")
 
 function __init__()
     push!(Observables.addhandler_callbacks, WebIO.setup_comm)
-    @require Mux="a975b10e-0019-58db-a62f-e48ff68538c9" begin
-        include_string(@__MODULE__, provider_mux.code, provider_mux.file)
-    end
-    @require Blink="ad839575-38b3-5650-b840-f874b8c74a25" begin
-        # The latest version of Blink defines their own WebIO integration
-        # (after https://github.com/JunoLab/Blink.jl/pull/201).
-        if isdefined(Blink.AtomShell, :initwebio!)
-            return
-        end
-        Base.depwarn(
-            "Please upgrade Blink for a smoother integration with WebIO.",
-            :webio_blink_upgrade,
-        )
-        include_string(@__MODULE__, provider_blink.code, provider_blink.file)
-    end
     @require IJulia="7073ff75-c697-5162-941a-fcdaad2a7d2a" begin
         include_string(@__MODULE__, provider_ijulia.code, provider_ijulia.file)
     end
-    @require WebSockets="104b5d7c-a370-577a-8038-80a2059c5097" begin
-        include_string(@__MODULE__, provider_generic_http.code, provider_generic_http.file)
-    end
-
 end
 
 end # module