First commit. Basic functionality already provided

Author: pggalaviz

.formatter.exs

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

.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 3rd-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").
+qr_coder-*.tar
+
+# Rust stuff
+/native/qr_coder/target/
+/priv/native/*.so
+
+.DS_Store

README.md

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+# QRCoder
+
+An Elixir Rust NIF to create SVG QR codes.
+It's a wrapper around [qrcode-rust](https://github.com/kennytm/qrcode-rust).
+
+## Installation
+
+You can add this package to your project dependencies:
+
+```elixir
+# mix.exs
+def deps do
+  [
+    {:qr_coder, git: "https://github.com/pggalaviz/qrcoder.git"}
+  ]
+end
+```
+## Usage
+
+You can then call the function:
+
+```elixir
+{:ok, svg} = QRCoder.generate_svg("Elixir is awesome")
+```
+This will return a `tuple` where **svg** is black & white svg binary.
+
+You can change the dark color by providing a valid HEX color:
+
+```elixir
+{:ok, svg} = QRCoder.generate_svg("Elixir is awesome", "#d5dae6")
+```
+
+You can then save it:
+
+```elixir
+{:ok, svg} = QRCoder.generate_svg("Elixir is awesome")
+File..write("/your/path/qrcode.svg", svg)
+```
+
+Or just return the binary:
+
+```elixir
+# inside a Phoenix controller
+{:ok, svg} = QRCoder.generate_svg("Elixir is awesome")
+
+conn
+|> put_resp_header("content-type", "image/svg+xml")
+|> put_resp_header("cache-control", "private")
+|> send_resp(200, svg)
+```

config/config.exs

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+# This file is responsible for configuring your application
+# and its dependencies with the aid of the Mix.Config module.
+use Mix.Config
+
+# This configuration is loaded before any dependency and is restricted
+# to this project. If another project depends on this project, this
+# file won't be loaded nor affect the parent project. For this reason,
+# if you want to provide default values for your application for
+# 3rd-party users, it should be done in your "mix.exs" file.
+
+# You can configure your application as:
+#
+#     config :qr_coder, key: :value
+#
+# and access this configuration in your application as:
+#
+#     Application.get_env(:qr_coder, :key)
+#
+# You can also configure a 3rd-party app:
+#
+#     config :logger, level: :info
+#
+
+# It is also possible to import configuration files, relative to this
+# directory. For example, you can emulate configuration per environment
+# by uncommenting the line below and defining dev.exs, test.exs and such.
+# Configuration from the imported file will override the ones defined
+# here (which is why it is important to import them last).
+#
+#     import_config "#{Mix.env()}.exs"

lib/qr_coder.ex

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+defmodule QRCoder do
+  @moduledoc """
+  Generates an svg binary with given data.
+  """
+
+  use Rustler, otp_app: :qr_coder, crate: :qr_coder
+
+  @spec generate_svg(String.t()) :: {:ok, String.t()} | {:error, :invalid}
+  def generate_svg(bin) when is_binary(bin) do
+    generate_svg(bin, "#000000")
+  end
+
+  def generate_svg(_), do: {:error, :invalid}
+
+  @doc """
+  Generate SVG QRCode
+  ## Example
+      iex> QRCoder.generate_svg("Elixir is awesome")
+      {:ok, "<svg>...</svg>"}
+  """
+  @spec generate_svg(String.t(), String.t()) :: {:ok, String.t()}
+  def generate_svg(_, _), do: exit(:nif_not_loaded)
+end

mix.exs

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+defmodule QRCoder.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :qr_coder,
+      version: "0.1.0",
+      elixir: "~> 1.7",
+      build_embedded: Mix.env() == :prod,
+      start_permanent: Mix.env() == :prod,
+      compilers: [:rustler] ++ Mix.compilers(),
+      rustler_crates: rustler_crates(),
+      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
+    [
+      {:rustler, "~> 0.18.0"}
+    ]
+  end
+
+  defp rustler_crates do
+    [
+      qr_coder: [
+        path: "native/qr_coder",
+        mode: if(Mix.env() == :prod, do: :release, else: :debug)
+      ]
+    ]
+  end
+end

mix.lock

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+%{
+  "rustler": {:hex, :rustler, "0.18.0", "db4bd0c613d83a1badc31be90ddada6f9821de29e4afd15c53a5da61882e4f2d", [:mix], [], "hexpm"},
+}