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

@@ -31,7 +31,7 @@ sealed class Command private constructor(
                 command.renderer.render(result.path)?.let { print(it) }
             }
             is ContextParser.Result.Failure -> {
-                println("error: ${result.error.message}")
+                println("error: ${result.failure.message}")
                 val command = result.path.last()
                 command.renderer.render(result.path)?.let {
                     println()

src/commonMain/kotlin/com/infendro/cli/command/context/ContextParser.kt

@@ -19,13 +19,13 @@ internal class ContextParser(
 
         data class Failure(
             val path: List<Command>,
-            val error: RunError,
+            val failure: RuntimeFailure,
         ) : Result()
     }
 
     private fun success(context: Context) = Result.Success(context)
     private fun help(path: List<Command>) = Result.Help(path)
-    private fun failure(path: List<Command>, exception: RunError) = Result.Failure(path, exception)
+    private fun failure(path: List<Command>, exception: RuntimeFailure) = Result.Failure(path, exception)
 
     private var index = 0
     private val current: String
@@ -63,7 +63,7 @@ internal class ContextParser(
             if (cmd is Command.Fallback<*>) {
                 val value = when (val result = cmd.parser.parse(current)) {
                     is Parser.Result.Success<*> -> result.value
-                    is Parser.Result.Failure<*> -> return failure(path, result.error)
+                    is Parser.Result.Failure<*> -> return failure(path, result.failure)
                 }
                 commands[cmd.key] = value
             }
@@ -91,7 +91,7 @@ internal class ContextParser(
 
                     val value = when (val result = argument.parser.parse(trimmed)) {
                         is Parser.Result.Success<*> -> result.value
-                        is Parser.Result.Failure<*> -> return failure(path, result.error)
+                        is Parser.Result.Failure<*> -> return failure(path, result.failure)
                     }
                     arguments[argument]!! += value
                     argumentCount++
@@ -141,7 +141,7 @@ internal class ContextParser(
                             text != null ->
                                 when (val result = option.parser.parse(current)) {
                                     is Parser.Result.Success<*> -> result.value
-                                    is Parser.Result.Failure<*> -> return failure(path, result.error)
+                                    is Parser.Result.Failure<*> -> return failure(path, result.failure)
                                 }
                             option.flag -> option.fallback!!
                             else -> return failure(path, MissingOptionValue(option))

src/commonMain/kotlin/com/infendro/cli/error/run/InvalidArgumentCount.kt

@@ -5,7 +5,7 @@ import com.infendro.cli.command.argument.Argument
 class InvalidArgumentCount(
     val argument: Argument<*>,
     val count: Int,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() {
             val expected = when {

src/commonMain/kotlin/com/infendro/cli/error/run/InvalidOptionCount.kt

@@ -5,7 +5,7 @@ import com.infendro.cli.command.option.Option
 class InvalidOptionCount(
     val option: Option<*>,
     val count: Int,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() {
             val expected = when {

src/commonMain/kotlin/com/infendro/cli/error/run/InvalidValue.kt

@@ -5,7 +5,7 @@ import kotlin.reflect.KClass
 class InvalidValue(
     val value: String,
     val type: KClass<*>,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() = """"$value" cannot be converted to ${type.simpleName ?: "Unknown"}"""
 }

src/commonMain/kotlin/com/infendro/cli/error/run/MalformedOption.kt

@@ -2,7 +2,7 @@ package com.infendro.cli.error.run
 
 class MalformedOption(
     val option: String,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() = """malformed option "$option""""
 }

src/commonMain/kotlin/com/infendro/cli/error/run/MissingOptionValue.kt

@@ -4,7 +4,7 @@ import com.infendro.cli.command.option.Option
 
 class MissingOptionValue(
     val option: Option<*>,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() = """no value provided for option "${option.name}""""
 }

src/commonMain/kotlin/com/infendro/cli/error/run/RuntimeFailure.kt

@@ -1,5 +1,5 @@
 package com.infendro.cli.error.run
 
-abstract class RunError {
+abstract class RuntimeFailure {
     abstract val message: String
 }

src/commonMain/kotlin/com/infendro/cli/error/run/UnexpectedArgument.kt

@@ -1,6 +1,6 @@
 package com.infendro.cli.error.run
 
-class UnexpectedArgument : RunError() {
+class UnexpectedArgument : RuntimeFailure() {
     override val message: String
         get() = """unexpected argument"""
 }

src/commonMain/kotlin/com/infendro/cli/error/run/UnknownCommand.kt

@@ -2,7 +2,7 @@ package com.infendro.cli.error.run
 
 class UnknownCommand(
     val command: String,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() = """unknown command "$command""""
 }

src/commonMain/kotlin/com/infendro/cli/error/run/UnknownOption.kt

@@ -2,7 +2,7 @@ package com.infendro.cli.error.run
 
 class UnknownOption(
     val option: String,
-) : RunError() {
+) : RuntimeFailure() {
     override val message: String
         get() = """unknown option "$option""""
 }

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

@@ -1,7 +1,7 @@
 package com.infendro.cli.parser
 
 import com.infendro.cli.error.run.InvalidValue
-import com.infendro.cli.error.run.RunError
+import com.infendro.cli.error.run.RuntimeFailure
 import kotlin.reflect.KClass
 
 abstract class Parser<T : Any>(
@@ -13,7 +13,7 @@ abstract class Parser<T : Any>(
         ) : Result<T>()
 
         data class Failure<T : Any>(
-            val error: RunError,
+            val failure: RuntimeFailure,
         ) : Result<T>()
     }