Issue JuliaDynamics#399 package dependencies

Project.toml

@@ -15,6 +15,14 @@ Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 Scratch = "6c6a2e73-6563-6170-7368-637461726353"
 UnPack = "3a884ed6-31ef-47d7-9d2a-63182c4928ed"
 
+[weakdeps]
+Requires = "ae029012-a4dd-5104-9daa-d747884805df"
+DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+
+[extensions]
+Requires = "Requires"
+DataFrames = "DataFrames"
+
 [compat]
 FileIO = "1.0.6"
 JLD2 = "0.4.15"

src/DrWatson.jl

@@ -51,7 +51,18 @@ include("saving_files.jl")
 include("dict_list.jl")
 
 # Functionality that requires Dataframes and other heavy dependencies:
-using Requires
+
+if !isdefined(Base, :get_extension)
+    using Requires
+    end
+
+    function __init__()
+        # Other init functionality here
+
+        @static if !isdefined(Base, :get_extension)
+            @require DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+        end
+    end
 
 # Update messages
 using Scratch

src/result_collection.jl

@@ -1,5 +1,7 @@
 export collect_results, collect_results!
 
+isdefined(Base, :get_extension) ? (using DataFrames) : (using ..DataFrames)
+
 """
     collect_results!([filename,] folder; kwargs...) -> df