add elixir project files

.formatter.exs

@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]

.gitignore

@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+ssb_bfe-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

lib/ssb_bfe.ex

@@ -0,0 +1,18 @@
+defmodule SsbBfe do
+  @moduledoc """
+  Documentation for `SsbBfe`.
+  """
+
+  @doc """
+  Hello world.
+
+  ## Examples
+
+      iex> SsbBfe.hello()
+      :world
+
+  """
+  def hello do
+    :world
+  end
+end

lib/ssb_bfe/encoder.ex

@@ -0,0 +1,5 @@
+defmodule SsbBfe.Encoder do
+  def encode_bool(blob_id) do
+    # Enum.sum(list) / Kernel.length(list)
+  end
+end

lib/ssb_bfe/types.ex

@@ -0,0 +1,21 @@
+defmodule SsbBfe.Types do
+  @doc ~S"""
+  Take a blob ID as a string and return the encoded bytes representing the blob
+  type-format. Return `nil` if the ID does not end with `.sha256`.
+  """
+  def get_blob_type(blob_id) do
+    if String.ends_with?(blob_id, ".sha256") do
+      <<2, 0>>
+    end
+  end
+  
+  @doc ~S"""
+  Take a feed ID (key) as a string and return the encoded bytes representing
+  the feed type-format. Return `nil` if the ID does not end with `.ed25519`.
+  """
+  def get_feed_type(feed_id) do
+    if String.ends_with?(feed_id, ".ed25519") do
+      <<0, 0>>
+    end
+  end
+end

mix.exs

@@ -0,0 +1,28 @@
+defmodule SsbBfe.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :ssb_bfe,
+      version: "0.1.0",
+      elixir: "~> 1.13",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end

test/ssb_bfe_test.exs

@@ -0,0 +1,8 @@
+defmodule SsbBfeTest do
+  use ExUnit.Case
+  doctest SsbBfe
+
+  test "greets the world" do
+    assert SsbBfe.hello() == :world
+  end
+end

test/test_helper.exs

@@ -0,0 +1 @@
+ExUnit.start()