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persist_config
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Persists configurations from given files at compile time.
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lib/persist_config.ex
defmodule PersistConfig do
@moduledoc """
Persists configuration files and puts the current app in a module attribute.
## use PersistConfig
Supports the following options:
- `:app` - module attribute to hold the current app, defaults to `:app`
- `:files` - (wildcard) paths, defaults to `["config/persist*.exs"]`
Option `:files` lists the configuration files to be persisted.
These are typically imported in the `config/config.exs` file.
For example: `import_config "persist_this_config.exs"`.
Each entry represents a (wildcard) path relative to the root.
If the list is or ends up being empty, no files are persisted.
## Usage
```elixir
use PersistConfig files: ["config/persist_path.exs"]
...
@path Application.get_env(@app, :path)
```
```elixir
use PersistConfig, app :my_app
...
@my_attr Application.get_env(@my_app, :my_attr)
```
"""
defmacro __using__(options \\ []) do
app = options[:app] || :app
files = options[:files] || ["config/persist*.exs"]
files = files |> Enum.map(&Path.wildcard/1) |> List.flatten()
quote bind_quoted: [app: app, files: files] do
Enum.each(files, fn file ->
file |> Mix.Config.eval!() |> elem(0) |> Mix.Config.persist()
@external_resource Path.expand(file)
end)
Module.put_attribute(__MODULE__, app, Mix.Project.config()[:app])
end
end
end