# ![](temple.png)

[![Actions Status](https://github.com/mhanberg/temple/workflows/CI/badge.svg)](https://github.com/mhanberg/temple/actions)
[![Hex.pm](https://img.shields.io/hexpm/v/temple.svg)](https://hex.pm/packages/temple)
[![Slack](https://img.shields.io/badge/chat-Slack-blue)](https://elixir-lang.slack.com/messages/CMH6MA4UD)

Temple is a DSL for writing HTML using Elixir.

You're probably here because you want to use Temple to write Phoenix templates, which is why Temple includes a [Phoenix template engine](#phoenix-templates) and Temple-compatible [Phoenix form helpers](#phoenixhtml).

## Installation

Add `temple` to your list of dependencies in `mix.exs`:

```elixir
def deps do
  [{:temple, "~> 0.4.0"}]
end
```

## Usage

Using Temple is a as simple as using the DSL inside of an `temple/1` block. This returns a safe result of the form `{:safe, html_string}`.

See the [documentation](https://hexdocs.pm/temple/Temple.Html.html) for more details.

```elixir
use Temple

temple do
  h2 "todos"

  ul class: "list" do
    for item <- @items do
      li class: "item" do
        div class: "checkbox" do
          div class: "bullet hidden"
        end

        div item
      end
    end
  end

  script """
  function toggleCheck({currentTarget}) {
    currentTarget.children[0].children[0].classList.toggle("hidden");
  }

  let items = document.querySelectorAll("li");

  Array.from(items).forEach(checkbox => checkbox.addEventListener("click", toggleCheck));
  """
end
```

### Components

Temple provides an API for creating custom components that act as custom HTML elements.

These components can be given `assigns` that are available inside the component definition as module attributes. The contents of a components `do` block are available as a special `@children` assign.

See the [documentation](https://hexdocs.pm/temple/Temple.html#defcomponent/2) for more details.

```elixir
defcomponent :flex do
  div id: @id, class: "flex" do
    @children
  end
end

temple do
  flex id: "my-flex" do
    div "Item 1"
    div "Item 2"
    div "Item 3"
  end
end
```

### Phoenix.HTML

Temple provides macros for working with the helpers provided by the [Phoenix.HTML](https://www.github.com/phoenixframework/phoenix_html) package.

Most of the macros are purely wrappers, while the semantics of some are changed to work with Temple.

See the [documentation](https://hexdocs.pm/temple/Temple.Form.html#content) for more details.

```elixir
temple do
  form_for @conn, Routes.some_path(@conn, :create) do
    text_input form, :name
  end
end
```

### Phoenix templates

Add the templating engine to your Phoenix configuration.

See the [documentation](https://hexdocs.pm/temple/Temple.Engine.html#content) for more details.

```elixir
# config.exs
config :phoenix, :template_engines, exs: Temple.Engine

# config/dev.exs
config :your_app, YourAppWeb.Endpoint,
  live_reload: [
    patterns: [
      ~r"lib/your_app_web/templates/.*(exs)$"
    ]
  ]

# your_app_web.ex
def view do
  quote do
    # ...
    use Temple # Replaces the call to import Phoenix.HTML
  end
end
```

```elixir
# app.html.exs
html lang: "en" do
  head do
    meta charset: "utf-8"
    meta http_equiv: "X-UA-Compatible", content: "IE=edge"
    meta name: "viewport", content: "width=device-width, initial-scale=1.0"
    title "YourApp · Phoenix Framework"

    link rel: "stylesheet", href: Routes.static_path(@conn, "/css/app.css")
  end

  body do
    header do
      section class: "container" do
        nav role: "navigation" do
          ul do
            li do: a("Get Started", href: "https://hexdocs.pm/phoenix/overview.html")
          end
        end

        a href: "http://phoenixframework.org/", class: "phx-logo" do
          img src: Routes.static_path(@conn, "/images/phoenix.png"),
              alt: "Phoenix Framework Logo"
        end
      end
    end

    main role: "main", class: "container" do
      p get_flash(@conn, :info), class: "alert alert-info", role: "alert"
      p get_flash(@conn, :error), class: "alert alert-danger", role: "alert"

      partial render(@view_module, @view_template, assigns)
    end

    script type: "text/javascript", src: Routes.static_path(@conn, "/js/app.js")
  end
end
```

### Tasks

#### temple.convert

This task can be used to convert plain HTML and SVG into Temple syntax. Input is taken from stdin or from a file and the output is sent to stdout.

`cat index.html | mix temple.convert > index.html.exs`

### Formatter

To include Temple's formatter configuration, add `:temple` to your `.formatter.exs`.

```elixir
[
  import_deps: [:temple],
  inputs: ["*.{ex,exs}", "priv/*/seeds.exs", "{config,lib,test}/**/*.{ex,exs}"],
]
```