1 files changed, 71 insertions, 0 deletions
diff --git a/pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/cli.ex b/pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/cli.ex
new file mode 100644
index 00000000000..e735c428516
--- /dev/null
+++ b/pkgs/desktops/pantheon/nixpkgs_github_update/lib/nixpkgs_github_update/cli.ex
@@ -0,0 +1,71 @@
+defmodule NixpkgsGitHubUpdate.CLI do
+  @moduledoc """
+  Run updates on Nix Expressions that use fetchFromGitHub.
+
+  Arguments the script accepts:
+  --attribute <attribute_path>
+
+  Example usage:
+  ```
+  ./nixpkgs_github_update --attribute "notes-up"
+  ```
+  """
+  alias NixpkgsGitHubUpdate.{Nix, GitHubLatestVersion}
+
+  def help do
+    IO.puts("""
+    Run updates on Nix Expressions that use fetchFromGitHub.
+
+    Arguments the script accepts:
+    --attribute <attribute_path>
+
+    Example usage:
+    ./nixpkgs_github_update --attribute "notes-up"
+    """)
+  end
+
+  def main([]) do
+    help()
+  end
+
+  def main(args) do
+    opts = parse_args(args)
+
+    attribute = opts[:attribute]
+
+    case Nix.attribute_exists?(attribute) do
+      true -> update(attribute)
+      _ -> exit("Requested attribute doesn't exist.")
+    end
+  end
+
+  def parse_args(args) do
+    {options, _, _} =
+      args
+      |> OptionParser.parse(strict: [attribute: :string])
+
+    options
+  end
+
+  def update(attribute) do
+    version =
+      Nix.get_owner_repo(attribute)
+      |> GitHubLatestVersion.fetch()
+      |> decode_response()
+      |> construct_version()
+
+    Nix.update_source_version(attribute, version)
+  end
+
+  def decode_response({:ok, response}), do: response
+
+  def decode_response({:error, error}) do
+    IO.puts("Error getting latest release from GitHub: #{error["message"]}")
+    System.halt(2)
+  end
+
+  def construct_version(response) do
+    Map.get(response, "tag_name")
+    |> String.trim_leading("v")
+  end
+end