Fix argfiles specified after subcommands (#574)

Fixes #570

Author: ajalt

CHANGELOG.md

@@ -1,13 +1,16 @@
 # Changelog
 
 ## Unreleased
+### Fixed
+- Fixed `@argfiles` not being expanded when specified after a subcommand ([#570](https://github.com/ajalt/clikt/pull/570))
+
 ## 5.0.2
 ### Changed
 - Update Kotlin to 2.1.0
 
 ## 5.0.1
 ### Added
-- Added completion commands for suspending and chained commands.  ([#553](https://github.com/ajalt/clikt/pull/553))
+- Added completion commands for suspending and chained commands. ([#553](https://github.com/ajalt/clikt/pull/553))
 - Added no-op suspending commands. ([#554](https://github.com/ajalt/clikt/pull/554))
 
 ### Changed

clikt/src/commonMain/kotlin/com/github/ajalt/clikt/core/Context.kt

@@ -317,7 +317,7 @@ class Context private constructor(
          *
          * The block should throw [FileNotFound] if the given `filename` cannot be read.
          */
-        var readArgumentFile: ((filename: String) -> String)? = null
+        var readArgumentFile: ((filename: String) -> String)? = parent?.readArgumentFile
 
         @Suppress("unused")
         @Deprecated("Renamed to readArgumentFile", ReplaceWith("readArgumentFile"))

test/src/commonTest/kotlin/com/github/ajalt/clikt/parsers/AtFileTest.kt

@@ -3,8 +3,10 @@ package com.github.ajalt.clikt.parsers
 import com.github.ajalt.clikt.core.CliktCommand
 import com.github.ajalt.clikt.core.UsageError
 import com.github.ajalt.clikt.core.context
+import com.github.ajalt.clikt.core.subcommands
 import com.github.ajalt.clikt.parameters.arguments.argument
 import com.github.ajalt.clikt.parameters.arguments.multiple
+import com.github.ajalt.clikt.parameters.options.flag
 import com.github.ajalt.clikt.parameters.options.option
 import com.github.ajalt.clikt.testing.TestCommand
 import com.github.ajalt.clikt.testing.parse
@@ -151,6 +153,21 @@ class AtFileTest {
         C(false).withAtFiles("baz" to "bar").parse("foo @baz")
     }
 
+    @Test
+    @JsName("atfile_after_subcommand")
+    fun `atfile after subcommand`() {
+        class C: TestCommand() {
+            val o by option().flag()
+
+            override fun run_() {
+                o shouldBe true
+            }
+        }
+
+        TestCommand().subcommands(C())
+            .withAtFiles("f" to "--o").parse("c @f")
+    }
+
     @Test
     @JsName("disabling_atfile")
     fun `disabling atfile`() {