SVG

Tools for caching and serving encoded SVGs for Phoenix.

Installation

Add to your mix.exs as usual:

def deps do
  [{:svg, "~> 1.0"}]
end

If you're not using application inference, then add :svg to your applications list.

Replacing urls to SVGs in your CSS

Using the mix svg.encode task, all references to svg files in your priv/static/css will be replaced with the base64 encoded svg.

For example, if you have an app.css file with the following contents:

.foo {
  background-url: url(/icons/add.svg)
}

it will be transformed to this:

.foo {
  background-url: url(data:image/svg+xml;base64,PHN2ZyB4bWxucz0ia...)
}

By default, task will look for SVGs in the /priv/static/images folder.

Using encoded SVGs at runtime

You need to configure :svg in your config.exs first:

config :svg, otp_app: :my_app # Replace :my_app

And then run the background server:

defmodule MyApp do
  use Application

  def start(_type, _args) do
    import Supervisor.Spec

    children = [
      # .. Ecto, Repo, etc.

      worker(SVG.Server, [])
    ]

    # ...
  end
end

The server will build up cache when the main application starts. It will concurrently read all svgs in your priv/static/images folder and cache them in memory. You can then use the base64 encoded svgs like so:

<img src="<%=raw SVG.Server.get("icons/add") %>">

Where icons/add corresponds to priv/static/images/icons/add.svg on the filesystem. You may want to alias the server when using in templates:

alias SVG.Server, as: SVG

and then you can use SVG.get/1 directly.

Utility functions

See docs for functions available on the main SVG module.

Roadmap

~~Mix task for replacing svg refs in CSS~~
Option for URI-encoding instead of Base64
Option for raw svg output (no encoding, just inline)
Use SVGO if installed locally

License

svg: See LICENSE file.