Initial release

.formatter.exs

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

.github/workflows/elixir.yaml

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+name: Elixir CI
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  test:
+
+    name: Build and test
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v3
+    - name: Set up Elixir
+      uses: erlef/setup-beam@988e02bfe678367a02564f65ca2e37726dc0268f
+      with:
+        elixir-version: '1.13.4' # Define the elixir version [required]
+        otp-version: '24.3.4.2' # Define the OTP version [required]
+    - name: Restore dependencies cache
+      uses: actions/cache@v3
+      with:
+        path: deps
+        key: ${{ runner.os }}-mix-${{ hashFiles('**/mix.lock') }}
+        restore-keys: ${{ runner.os }}-mix-
+    - name: Install dependencies
+      run: mix deps.get
+    - name: Run tests
+      run: mix test

.gitignore

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+# 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").
+fast_syndication-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/

.tool-versions

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+elixir 1.13.4
+erlang 24.3.4.2

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [0.1.0] - 2022-08-17
+### Added
+- Initial release for parsing RSS and Atom feeds

README.md

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+# FastSyndication
+
+Minimal wrapper around Rust NIFs for fast RSS and Atom feed parsing
+
+## Usage
+
+```elixir
+iex(1)>  {:ok, map_of_rss} = FastRSS.parse(%{rss_string: "...rss_feed_string..."})
+iex(2)>  {:ok, map_of_atom} = FastRSS.parse(%{atom_string: "...rss_feed_string..."})
+```

lib/fast_syndication.ex

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+defmodule FastSyndication do
+  defmodule Native do
+    use Rustler, otp_app: :fast_syndication, crate: "fastsyndication"
+
+    def parse_atom(_a), do: :erlang.nif_error(:nif_not_loaded)
+    def parse_rss(_a), do: :erlang.nif_error(:nif_not_loaded)
+  end
+
+  def parse(""), do: {:error, "Cannot parse blank string"}
+
+  def parse(%{atom_string: atom_string}) when is_binary(atom_string) do
+    atom_string
+    |> Native.parse_atom()
+    |> map_to_tuple()
+  end
+
+  def parse(%{rss_string: rss_string}) when is_binary(rss_string) do
+    rss_string
+    |> Native.parse_rss()
+    |> map_to_tuple()
+  end
+
+  def parse(_somethig_else), do: {:error, "RSS feed must be passed in as a string"}
+
+  defp map_to_tuple(%{"Ok" => map}), do: {:ok, map}
+  defp map_to_tuple({:ok, map}), do: {:ok, map}
+  defp map_to_tuple(%{"Err" => msg}), do: {:error, msg}
+  defp map_to_tuple({:error, msg}), do: {:error, msg}
+end

mix.exs

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+defmodule FastSyndication.MixProject do
+  use Mix.Project
+
+  @source_url "https://github.com/mikhailbot/fast_syndication"
+  @version "0.1.0"
+
+  def project do
+    [
+      app: :fast_syndication,
+      version: @version,
+      elixir: "~> 1.13",
+      start_permanent: Mix.env() == :prod,
+      deps: deps(),
+
+      # hex
+      description: "Fast Elixir RSS and Atom feed parser",
+      package: package()
+    ]
+  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
+    [
+      {:rustler, "~> 0.25.0"}
+    ]
+  end
+
+  defp package() do
+    [
+      files: [
+        "lib",
+        "native/fastsyndication/.cargo",
+        "native/fastsyndication/src",
+        "native/fastsyndication/Cargo.toml",
+        "native/fastsyndication/Cargo.lock",
+        "mix.exs",
+        "README.md",
+        "LICENSE"
+      ],
+      maintainers: ["Mikhail Delport"],
+      licenses: ["Apache-2.0"],
+      links: %{
+        "Changelog" => "#{@source_url}/blob/master/CHANGELOG.md",
+        "GitHub" => @source_url
+      }
+    ]
+  end
+end

mix.lock

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+%{
+  "jason": {:hex, :jason, "1.3.0", "fa6b82a934feb176263ad2df0dbd91bf633d4a46ebfdffea0c8ae82953714946", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "53fc1f51255390e0ec7e50f9cb41e751c260d065dcba2bf0d08dc51a4002c2ac"},
+  "rustler": {:hex, :rustler, "0.25.0", "32526b51af7e58a740f61941bf923486ce6415a91c3934cc16c281aa201a2240", [:mix], [{:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}, {:toml, "~> 0.6", [hex: :toml, repo: "hexpm", optional: false]}], "hexpm", "6b43a11a37fe79c6234d88c4102ab5dfede7a6a764dc5c7b539956cfa02f3cf4"},
+  "toml": {:hex, :toml, "0.6.2", "38f445df384a17e5d382befe30e3489112a48d3ba4c459e543f748c2f25dd4d1", [:mix], [], "hexpm", "d013e45126d74c0c26a38d31f5e8e9b83ea19fc752470feb9a86071ca5a672fa"},
+}

native/fastsyndication/.cargo/config

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+[target.'cfg(target_os = "macos")']
+rustflags = [
+    "-C", "link-arg=-undefined",
+    "-C", "link-arg=dynamic_lookup",
+]

native/fastsyndication/.gitignore

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+/target