Use Jason Instead of JSX

Given that the broader Elixir community is circling their wagons around
Jason, and issue parroty#153, it seems that moving to Jason would be a wise
choice.

Author: jherdman

lib/exvcr/json.ex

@@ -7,11 +7,12 @@ defmodule ExVCR.JSON do
   Save responses into the json file.
   """
   def save(file_name, recordings) do
-    json = recordings
-    |> Enum.map(&encode_binary_data/1)
-    |> Enum.reverse()
-    |> JSX.encode!()
-    |> JSX.prettify!()
+    json =
+      recordings
+      |> Enum.map(&encode_binary_data/1)
+      |> Enum.reverse()
+      |> Jason.encode_to_iodata!()
+      |> Jason.Formatter.pretty_print_to_iodata()
 
     unless File.exists?(path = Path.dirname(file_name)), do: File.mkdir_p!(path)
     File.write!(file_name, json)

lib/exvcr/records.ex

@@ -2,17 +2,51 @@ defmodule ExVCR.Record do
   defstruct options: nil, responses: nil
 end
 
+defmodule ExVCR.Utils do
+  @moduledoc false
+
+  def keyword_to_map(kw) do
+    Enum.reduce(kw, %{}, fn {k, v}, acc -> Map.put(acc, k, v) end)
+  end
+end
+
 defmodule ExVCR.Request do
   defstruct url: nil, headers: [], method: nil, body: nil, options: [], request_body: ""
+
+  defimpl Jason.Encoder, for: ExVCR.Request do
+    def encode(value, opts) do
+      %{headers: headers, options: options} = Map.take(value, [:headers, :options])
+
+      map = value
+            |> Map.take([:url, :method, :body, :request_body])
+            |> Map.put(:headers, ExVCR.Utils.keyword_to_map(headers))
+            |> Map.put(:options, ExVCR.Utils.keyword_to_map(options))
+
+      Jason.Encode.map(map, opts)
+    end
+  end
 end
 
 defmodule ExVCR.Response do
   defstruct type: "ok", status_code: nil, headers: [], body: nil, binary: false
+
+  defimpl Jason.Encoder, for: ExVCR.Response do
+    def encode(value, opts) do
+      headers = Map.get(value, :headers)
+
+      map = value
+            |> Map.take([:type, :status_code, :body, :binary])
+            |> Map.put(:headers, ExVCR.Utils.keyword_to_map(headers))
+
+      Jason.Encode.map(map, opts)
+    end
+  end
 end
 
 defmodule ExVCR.Checker.Results do
   defstruct dirs: nil, files: []
 end
+
 defmodule ExVCR.Checker.Counts do
   defstruct server: 0, cache: 0
 end

mix.exs

@@ -20,14 +20,14 @@ defmodule ExVCR.Mixfile do
   end
 
   def application do
-    [applications: [:meck, :exactor, :exjsx], mod: {ExVCR.Application, []}]
+    [applications: [:meck, :exactor], mod: {ExVCR.Application, []}]
   end
 
   def deps do
     [
       {:meck, "~> 0.8"},
       {:exactor, "~> 2.2"},
-      {:exjsx, "~> 4.0"},
+      {:jason, "~> 1.0"},
       {:ibrowse, "4.4.0", optional: true},
       {:httpotion, "~> 3.1", optional: true},
       {:httpoison, "~> 1.0", optional: true},

mix.lock

@@ -16,7 +16,6 @@
   "ibrowse": {:hex, :ibrowse, "4.4.0", "2d923325efe0d2cb09b9c6a047b2835a5eda69d8a47ed6ff8bc03628b764e991", [:rebar3], [], "hexpm", "6a8e5988872086f0506bef68311493551ac5beae7c06ba2a00d5e9f97a60f1c2"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~>0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
   "jason": {:hex, :jason, "1.2.2", "ba43e3f2709fd1aa1dce90aaabfd039d000469c05c56f0b8e31978e03fa39052", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "18a228f5f0058ee183f29f9eae0805c6e59d61c3b006760668d8d18ff0d12179"},
-  "jsx": {:hex, :jsx, "2.8.3", "a05252d381885240744d955fbe3cf810504eb2567164824e19303ea59eef62cf", [:mix, :rebar3], [], "hexpm", "fc3499fed7a726995aa659143a248534adc754ebd16ccd437cd93b649a95091f"},
   "makeup": {:hex, :makeup, "1.0.0", "671df94cf5a594b739ce03b0d0316aa64312cee2574b6a44becb83cd90fb05dc", [:mix], [{:nimble_parsec, "~> 0.5.0", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "a10c6eb62cca416019663129699769f0c2ccf39428b3bb3c0cb38c718a0c186d"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.14.0", "cf8b7c66ad1cff4c14679698d532f0b5d45a3968ffbcbfd590339cb57742f1ae", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "d4b316c7222a85bbaa2fd7c6e90e37e953257ad196dc229505137c5e505e9eff"},
   "meck": {:hex, :meck, "0.9.2", "85ccbab053f1db86c7ca240e9fc718170ee5bda03810a6292b5306bf31bae5f5", [:rebar3], [], "hexpm", "81344f561357dc40a8344afa53767c32669153355b626ea9fcbc8da6b3045826"},