✨ Add allow_duplicate options

Author: ImNotAVirus

CHANGELOG.md

@@ -32,7 +32,9 @@ If you defined custom guards like:
 - defguard is_color_value(value) when value in color(:__values__)
 ```
 
-You can remove them entirely, they are now generated automatically:
+You can remove them entirely, they are now generated automatically.
+
+The following guards are now generated automatically:
 
 - `is_color/1` - checks if a value is a valid key or value
 - `is_color_key/1` - checks if a value is a valid key
@@ -44,6 +46,8 @@ You can remove them entirely, they are now generated automatically:
   for compile-time access to enum data.
 - **Guards**: `is_name/1`, `is_name_key/1`, `is_name_value/1` guard macros
   generated automatically for each enum.
+- **Options**: `allow_duplicate_keys` and `allow_duplicate_values` for
+  fine-grained control over duplicate validation.
 
 ### Improvements
 

lib/simple_enum.ex

@@ -23,6 +23,13 @@ defmodule SimpleEnum do
   [integer-based Enumeration](guides/integer_based_enum.md), you can check the
   corresponding guide.
 
+  ## Options
+
+   * `:allow_duplicate_keys` - when `true`, allows duplicate keys
+     in the enumerators list. Defaults to `false`.
+   * `:allow_duplicate_values` - when `true`, allows duplicate values
+     in the enumerators list. Defaults to `false`.
+
   The following macros are generated:
 
    * `name/1` for bidirectional key/value lookup
@@ -102,11 +109,14 @@ defmodule SimpleEnum do
     fields = kv_to_fields(expanded_kv, enum_name, __CALLER__)
     keys = Keyword.keys(fields)
     values = Keyword.values(fields)
-    allow_duplicate = Keyword.get(opts, :allow_duplicate, false)
+    allow_duplicate_keys = Keyword.get(opts, :allow_duplicate_keys, false)
+    allow_duplicate_values = Keyword.get(opts, :allow_duplicate_values, false)
 
-    raise_if_duplicate!("key", keys, enum_name, __CALLER__)
+    if !allow_duplicate_keys do
+      raise_if_duplicate!("key", keys, enum_name, __CALLER__)
+    end
 
-    if not allow_duplicate do
+    if !allow_duplicate_values do
       raise_if_duplicate!("value", values, enum_name, __CALLER__)
     end
 

test/simple_enum_test.exs

@@ -207,12 +207,24 @@ defmodule SimpleEnumTest do
       defmodule DuplicateAllowedValuesEnum do
         import SimpleEnum, only: [defenum: 3]
 
-        defenum :test, [allow_duplicate: true], [{:a, 1}, :b, :c, {:d, 3}]
+        defenum :test, [allow_duplicate_values: true], [{:a, 1}, :b, :c, {:d, 3}]
       end
       """
 
       assert [{DuplicateAllowedValuesEnum, _}] = Code.compile_string(code)
     end
+
+    test "duplicate keys are allowed" do
+      code = """
+      defmodule DuplicateAllowedKeysEnum do
+        import SimpleEnum, only: [defenum: 3]
+
+        defenum :test, [allow_duplicate_keys: true], ~w(a b c a)a
+      end
+      """
+
+      assert [{DuplicateAllowedKeysEnum, _}] = Code.compile_string(code)
+    end
   end
 
   describe "helpers" do