# MacrowEx
[![hex.pm version](https://img.shields.io/hexpm/v/macrow_ex.svg)](https://hex.pm/packages/macrow_ex)
[![hex.pm](https://img.shields.io/hexpm/l/macrow_ex.svg)](https://github.com/koyo-miyamura/macrow_ex/blob/master/LICENSE)
`MacrowEx` provides DSL for defining rules of text replacing.
It's inspired by https://github.com/syguer/macrow Ruby gem.
## Installation
If [available in Hex](https://hex.pm/docs/publish), the package can be installed
by adding `macrow_ex` to your list of dependencies in `mix.exs`:
```elixir
def deps do
[
{:macrow_ex, "~> 0.1.1"}
]
end
```
## How to use
Define your module and write `use MacrowEx`.
MacrowEx provides `rules/2` DSL to define replacement rules.
The second argument is function to replace and must return string.
```elixir
defmodule MyMacrowEx do
use MacrowEx
rules "hoge", fn ->
"ほげ"
end
rules "len", fn array ->
length(array) |> Integer.to_string()
end
end
```
Then `apply/1` `apply/2` function generates in your module.
```elixir
MyMacrowEx.apply("${hoge}")
"ほげ"
MyMacrowEx.apply("${hoge} length is ${len}", [1,2,3])
"ほげ length is 3"
```
You can customize default prefix `${` and suffix `}` as follows.
```elixir
defmodule MyMacrowEx do
use MacrowEx
macro_prefix "{{"
macro_suffix "}}"
rules "hoge", fn ->
"ほげ"
end
end
MyMacrowEx.apply("{{hoge}}")
"ほげ"
```
## Format
When you do not want to format DSL provided by MacrowEx, try to write in your `.formatter.exs` as follows.
```elixir
[
import_deps: [:macrow_ex]
]
```