Fix parsing multi subcommands with optional args

CHANGELOG.md

@@ -19,7 +19,7 @@
 - Added support for aliasing options to other options. ([#535](https://github.com/ajalt/clikt/pull/535))
 
 ### Changed
-- In a subcommand with `argument().multiple()`, the behavior is now the same regardless of the value of `allowMultipleSubcommands`: if a token matches a subcommand name, it's now treated as a subcommand rather than a positional argument.
+- In a subcommand with and an `argument()` with `multiple()` or `optional()`, the behavior is now the same regardless of the value of `allowMultipleSubcommands`: if a token matches a subcommand name, it's now treated as a subcommand rather than a positional argument.
 - Due to changes to the internal parsing algorithm, the exact details of error messages when multiple usage errors occur have changed in some cases.
 - **Breaking Change:** Moved the following parameters from `CliktCommand`'s constructor; override the corresponding properties instead:
 

clikt-mordant/src/commonTest/kotlin/com/github/ajalt/clikt/core/CliktCommandTest.kt

@@ -2,6 +2,7 @@ package com.github.ajalt.clikt.core
 
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.arguments.multiple
+import com.github.ajalt.clikt.parameters.arguments.optional
 import com.github.ajalt.clikt.parameters.groups.OptionGroup
 import com.github.ajalt.clikt.parameters.groups.cooccurring
 import com.github.ajalt.clikt.parameters.groups.mutuallyExclusiveOptions
@@ -10,9 +11,7 @@ import com.github.ajalt.clikt.parameters.options.flag
 import com.github.ajalt.clikt.parameters.options.option
 import com.github.ajalt.clikt.parameters.options.required
 import com.github.ajalt.clikt.parameters.types.int
-import com.github.ajalt.clikt.testing.TestCommand
-import com.github.ajalt.clikt.testing.parse
-import com.github.ajalt.clikt.testing.test
+import com.github.ajalt.clikt.testing.*
 import com.github.ajalt.clikt.testing.withEnv
 import io.kotest.assertions.throwables.shouldThrow
 import io.kotest.data.blocking.forAll

clikt-mordant/src/commonTest/kotlin/com/github/ajalt/clikt/parameters/SubcommandTest.kt

@@ -3,6 +3,7 @@ package com.github.ajalt.clikt.parameters
 import com.github.ajalt.clikt.core.*
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.arguments.multiple
+import com.github.ajalt.clikt.parameters.arguments.optional
 import com.github.ajalt.clikt.parameters.arguments.pair
 import com.github.ajalt.clikt.parameters.options.default
 import com.github.ajalt.clikt.parameters.options.option
@@ -338,6 +339,18 @@ class SubcommandTest {
         }
     }
 
+    @Test
+    @JsName("multiple_subcommands_optional_sub_arg")
+    fun `multiple subcommands optional sub arg`() {
+        class Sub: TestCommand(count = 2) {
+            val a by argument().optional()
+        }
+        class C: TestCommand(allowMultipleSubcommands = true)
+        val sub = Sub()
+        C().subcommands(sub).parse("sub sub b")
+        sub.a shouldBe "b"
+    }
+
     @Test
     @JsName("multiple_subcommands_with_nesting")
     fun `multiple subcommands with nesting`() {

clikt/src/commonMain/kotlin/com/github/ajalt/clikt/parsers/ParserInternals.kt

@@ -77,7 +77,9 @@ private class CommandParser<T : BaseCliktCommand<T>>(
     private val errors = mutableListOf<CliktError>()
     private var i = startingIndex
     private var minAliasI = i
-    private val minArgCount = command._arguments.sumOf { it.nvalues.coerceAtLeast(0) }
+    private val minArgCount = command._arguments.sumOf {
+        if (it.required) it.nvalues.coerceAtLeast(0) else 0
+    }
     private val canParseSubcommands get() = argumentTokens.size >= minArgCount
     private var canParseOptions = true
     private var canExpandAtFiles = context.expandArgumentFiles

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.7-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.10-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME