Add support for URIs (#302)

User must load HTTP manually for this to be activated.
(It exploits Requires.)

Closes #219
Closes #89

Project.toml

@@ -4,6 +4,7 @@ version = "1.6.0"
 
 [deps]
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
+Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
 [compat]
@@ -12,8 +13,9 @@ julia = "0.7, 1"
 [extras]
 ColorTypes = "3da002f7-5984-5a60-b8a6-cbb66c0b333f"
 FilePathsBase = "48062228-2e41-5def-b9a4-89aafe57970f"
+HTTP = "cd3eb016-35fb-5094-929b-558a96fad6f3"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 Test = "8dfed614-e22c-5e08-85e1-65c5234f0b40"
 
 [targets]
-test = ["ColorTypes", "FilePathsBase", "Random", "Test"]
+test = ["ColorTypes", "FilePathsBase", "HTTP", "Random", "Test"]

src/FileIO.jl

@@ -26,6 +26,7 @@ import Base.showerror
 using Base: RefValue, PkgId
 using Pkg
 using UUIDs
+using Requires
 
 include("types.jl")
 include("registry_setup.jl")
@@ -63,6 +64,12 @@ include("registry.jl")
 """
 FileIO
 
+function __init__()
+    @require HTTP="cd3eb016-35fb-5094-929b-558a96fad6f3" begin
+        load(uri::HTTP.URI) = load(IOBuffer(HTTP.get(uri).body))
+    end
+end
+
 if VERSION >= v"1.4.2" # https://github.com/JuliaLang/julia/pull/35378
     include("precompile.jl")
     _precompile_()

test/integration.jl

@@ -1,11 +1,12 @@
 using FileIO
 using ColorTypes
 using ColorTypes.FixedPointNumbers
+using HTTP
 using Pkg
 using Test
 
 @testset "Integration" begin
-    if haskey(ENV, "CI") && Base.VERSION >= v"1.3"
+    if haskey(ENV, "CI") && Base.VERSION >= v"1.3"  # ImageIO can't be loaded on Julia < 1.3, so putting it as test dep is problematic
         Pkg.add("ImageIO")
         img = rand(RGB{N0f8}, 50, 50)
         io = IOBuffer()
@@ -14,5 +15,8 @@ using Test
         io2 = IOBuffer(buf)
         img2 = load(io2)
         @test img2 == img
+
+        uri = HTTP.URI("https://upload.wikimedia.org/wikipedia/commons/thumb/b/b3/Wikipedia-logo-v2-en.svg/135px-Wikipedia-logo-v2-en.svg.png")
+        @test isa(load(uri), Matrix)
     end
 end