### TOML Example with Server Data

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

This TOML snippet defines server configurations, including IP addresses and ports, which will be used in the transformation example.

```toml
[servers.alpha]
ip = "192.168.1.1"
ports = [8080, 8081]

[servers.beta]
ip = "192.168.1.2"
ports = [8082, 8083]

```

--------------------------------

### Example TOML File Structure

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

This is a sample TOML file demonstrating various data types and structures, including strings, numbers, dates, arrays, and nested tables.

```toml
# This is a TOML document.

title = "TOML Example"

[owner]
name = "Tom Preston-Werner"
dob = 1979-05-27T07:32:00-08:00 # First class dates

[database]
server = "192.168.1.1"
ports = [ 8001, 8001, 8002 ]
connection_max = 5000
enabled = true

[servers]

  # Indentation (tabs and/or spaces) is allowed but not required
  [servers.alpha]
  ip = "10.0.0.1"
  dc = "eqdc10"

  [servers.beta]
  ip = "10.0.0.2"
  dc = "eqdc10"

[clients]
data = [ ["gamma", "delta"], [1, 2] ]

# Line breaks are OK when inside arrays
hosts = [
  "alpha",
  "omega"
]

```

--------------------------------

### Distillery Release Configuration with TOML Provider

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

This example shows how to set up TOML as a configuration provider within a Distillery release configuration file (`rel/config.exs`). It uses environment variables for the TOML file path.

```elixir
release :myapp do
  # ...snip...
  set config_providers: [
    {Toml.Provider, [path: "${XDG_CONFIG_DIR}/myapp.toml", transforms: [...]]}
  ]
end
```

--------------------------------

### Elixir Release Configuration with TOML Provider

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

Use this example to configure TOML as a provider in Elixir releases (1.9+). It specifies the path to the TOML file using system environment variables.

```elixir
config_providers: [
  {Toml.Provider, [
    path: {:system, "XDG_CONFIG_DIR", "myapp.toml"},
    transforms: [...] 
  ]}
]
```

--------------------------------

### Decoding TOML Data in Elixir

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

Demonstrates decoding TOML data from strings, streams, and files using the `Toml.decode` and related functions. Includes examples for default decoding and decoding with atoms as keys, as well as handling invalid TOML input.

```elixir
iex> input = """
[database]
server = "192.168.1.1"
"""
...> {:ok, %{"database" => %{"server" => "192.168.1.1"}}} = Toml.decode(input)
...> {:ok, %{database: %{server: "192.168.1.1"}}} = Toml.decode(input, keys: :atoms)
...> stream = File.stream!("example.toml")
...> {:ok, %{"database" => %{"server" => "192.168.1.1"}}} = Toml.decode_stream(stream)
...> {:ok, %{"database" => %{"server" => "192.168.1.1"}}} = Toml.decode_file("example.toml")
...> invalid = """
[invalid]
a = 1 b = 2
"""
...> {:error, {:invalid_toml, reason}} = Toml.decode(invalid); IO.puts(reason)
expected '\n', but got 'b' in nofile on line 2:

    a = 1 b = 2
         ^

:ok

```

--------------------------------

### TOML Configuration File Structure

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

This TOML structure demonstrates how to organize configuration for applications like 'myapp' and 'logger'. Keys at the root must be tables corresponding to application names.

```toml
# This is an example of something that would be ignored
title = "My config file"

# We're expecting something like this:
[myapp]
key = "value"

# To use a bit of Phoenix config, you translate to TOML like so:
[myapp."MyApp.Endpoint"]
cache_static_manifest = "priv/static/cache_manifest.json"

[myapp."MyApp.Endpoint".http]
port = "4000"

[myapp."MyApp.Endpoint".force_ssl]
hsts = true

# Or logger..
[logger]
level = "info"

[logger.console]
format = "[$level] $message \n"
```

--------------------------------

### Applying Multiple TOML Transformations in Elixir

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

Shows how to apply a list of custom transformation modules to a TOML document during decoding. The transformations are applied in order, depth-first, and bottom-up.

```elixir
iex> transforms = [IPStringToCharlist, CharlistToIP, ServerMapToList]
...> {:ok, result} = Toml.decode("example.toml", keys: :atoms, transforms: transforms)
%{servers: [%Server{name: :alpha, ip: {192,168,1,1}}, ports: [8080, 8081] | _]}

```

--------------------------------

### Add TOML Dependency to Elixir Project

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

Add the `:toml` dependency to your Elixir project's `deps` function. You can check the latest version on Hex.pm.

```elixir
def deps do
  [
    {:toml, "~> 0.7"}
  ]
end
```

--------------------------------

### Elixir Modules for TOML Transformations

Source: https://github.com/bitwalker/toml-elixir/blob/main/README.md

Defines Elixir modules that implement the `Toml.Transform` behavior to customize how specific TOML values are converted. These include converting IP strings to charlists, charlists to IP addresses, and server maps to a list of structs.

```elixir
defmodule Server do
  defstruct [:name, :ip, :ports]
end

defmodule IPStringToCharlist do
  use Toml.Transform
  
  def transform(:ip, v) when is_binary(v) do
    String.to_charlist(v)
  end
  def transform(_k, v), do: v
end

defmodule CharlistToIP do
  use Toml.Transform
  
  def transform(:ip, v) when is_list(v) do
    case :inet.parse_ipv4_address(v) do
      {:ok, address} ->
        address
      {:error, reason} ->
        {:error, {:invalid_ip_address, reason}}
    end
  end
  def transform(:ip, v), do: {:error, {:invalid_ip_address, v}}
  def transform(_k, v), do: v
end

defmodule ServerMapToList do
  use Toml.Transform
  
  def transform(:servers, v) when is_map(v) do
    for {name, server} <- v, do: struct(Server, Map.put(server, :name, name))
  end
  def transform(_k, v), do: v
end

```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.