Add ElixirScript.Context module

Author: gaggle

lib/context.ex

@@ -0,0 +1,59 @@
+defmodule ElixirScript.Context do
+  alias __MODULE__
+
+  defstruct [
+    :payload,
+    :event_name,
+    :sha,
+    :ref,
+    :workflow,
+    :action,
+    :actor,
+    :job,
+    :run_number,
+    :run_id,
+    :api_url,
+    :server_url,
+    :graphql_url
+  ]
+
+  defimpl Jason.Encoder, for: Context do
+    def encode(%Context{} = context, opts) do
+      Map.from_struct(context) |> Jason.Encode.map(opts)
+    end
+  end
+
+  def from_github_environment() do
+    payload = if System.get_env("GITHUB_EVENT_PATH") do
+      path = System.get_env("GITHUB_EVENT_PATH")
+      if File.exists?(path) do
+        File.read!(path) |> Jason.decode!()
+      else
+        IO.puts("GITHUB_EVENT_PATH #{path} does not exist")
+        %{}
+      end
+    else
+      %{}
+    end
+
+    %Context{
+      payload: payload,
+      event_name: System.get_env("GITHUB_EVENT_NAME") || "",
+      sha: System.get_env("GITHUB_SHA") || "",
+      ref: System.get_env("GITHUB_REF") || "",
+      workflow: System.get_env("GITHUB_WORKFLOW") || "",
+      action: System.get_env("GITHUB_ACTION") || "",
+      actor: System.get_env("GITHUB_ACTOR") || "",
+      job: System.get_env("GITHUB_JOB") || "",
+      run_number: System.get_env("GITHUB_RUN_NUMBER") |> parse_int(),
+      run_id: System.get_env("GITHUB_RUN_ID") |> parse_int(),
+      api_url: System.get_env("GITHUB_API_URL") || "https://api.github.com",
+      server_url: System.get_env("GITHUB_SERVER_URL") || "https://github.com",
+      graphql_url: System.get_env("GITHUB_GRAPHQL_URL") || "https://api.github.com/graphql"
+    }
+  end
+
+  defp parse_int(nil), do: nil
+  defp parse_int(value), do: String.to_integer(value)
+end
+