implement EnumParser

src/commonMain/kotlin/com/infendro/cli/command/Argument.kt

@@ -1,9 +1,7 @@
 package com.infendro.cli.command
 
-import com.infendro.cli.parser.BooleanParser
-import com.infendro.cli.parser.IntParser
+import com.infendro.cli.parser.*
 import com.infendro.cli.parser.Parser
-import com.infendro.cli.parser.StringParser
 
 sealed class Argument<T>(
     val parser: Parser<T>,
@@ -75,5 +73,17 @@ sealed class Argument<T>(
 
         fun booleans() =
             Variable(BooleanParser)
+
+        inline fun <reified T : Enum<T>> enum() =
+            Required(enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enumOrElse(other: T) =
+            OrElse(other, enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enumOrNull() =
+            OrNull(enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enums() =
+            Variable(enumParser<T>())
     }
 }

src/commonMain/kotlin/com/infendro/cli/command/Option.kt

@@ -1,10 +1,8 @@
 package com.infendro.cli.command
 
 import com.infendro.cli.exception.build.NoOptionNameException
-import com.infendro.cli.parser.BooleanParser
-import com.infendro.cli.parser.IntParser
+import com.infendro.cli.parser.*
 import com.infendro.cli.parser.Parser
-import com.infendro.cli.parser.StringParser
 
 sealed class Option<T>(
     val names: List<String>,
@@ -89,5 +87,17 @@ sealed class Option<T>(
 
         fun booleans(vararg names: String) =
             Variable(names.asList(), BooleanParser)
+
+        inline fun <reified T : Enum<T>> enum(vararg names: String) =
+            Required(names.asList(), enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enumOrElse(vararg names: String, other: T) =
+            OrElse(names.asList(), other, enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enumOrNull(vararg names: String) =
+            OrNull(names.asList(), enumParser<T>())
+
+        inline fun <reified T : Enum<T>> enums(vararg names: String) =
+            Variable(names.asList(), enumParser<T>())
     }
 }

src/commonMain/kotlin/com/infendro/cli/parser/EnumParser.kt

@@ -0,0 +1,17 @@
+package com.infendro.cli.parser
+
+import com.infendro.cli.exception.run.ParseException
+import kotlin.enums.enumEntries
+
+class EnumParser<T : Enum<T>>(
+    private val name: String,
+    private val values: List<T>,
+) : Parser<T> {
+    override fun parse(text: String?): T = try {
+        values.first { it.name == text }
+    } catch (_: Exception) {
+        throw ParseException(text, name)
+    }
+}
+
+inline fun <reified T : Enum<T>> enumParser() = EnumParser(T::class.simpleName!!, enumEntries<T>())