Require Kotlin 1.5.30 or newer in the host project

This commit also add tests to test our comparison of Kotlin versions.

Author: LouisCAD

plugin/src/main/kotlin/com/louiscad/complete_kotlin/internal/TargetsHandler.kt

@@ -23,6 +23,16 @@ internal fun Project.completePlatformKlibsIfNeeded() {
     //TODO: Get the CompilerVersion lazily (lazy delegate cannot be used)
     val compilerVersion = CompilerVersion.current(project = project, objectForResourceLookup = extension)
 
+    run {
+        val minimumKotlinVersion = "1.5.30"
+        if (compilerVersion.isAtLeast(CompilerVersion.fromString(minimumKotlinVersion)).not()) {
+            val errorMessage = "This version of CompleteKotlin requires the project to " +
+                    "use Kotlin $minimumKotlinVersion or newer. " +
+                    "Use version 1.0.0 of CompleteKotlin if you can't upgrade Kotlin in this project."
+            throw UnsupportedOperationException(errorMessage)
+        }
+    }
+
     val hostCompilerDirs = KotlinNativeCompilerDirs(compilerVersion)
 
 

plugin/src/test/kotlin/com/louiscad/complete_kotlin/CompilerVersionTest.kt

@@ -1,38 +1,41 @@
 package com.louiscad.complete_kotlin
 
 import com.louiscad.complete_kotlin.internal.CompilerVersion
+import com.louiscad.complete_kotlin.internal.isAtLeast
 import org.junit.jupiter.api.TestFactory
 import testutils.junit.mapDynamicTest
-import kotlin.test.Test
-import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
 
 class CompilerVersionTest {
 
-    @Test
-    fun testMyKnowledge() {
-        assertEquals(
-            expected = "1.5",
-            actual = CompilerVersion.fromString("1.5").toString()
+    @TestFactory
+    fun `check older Kotlin versions detection`() = unsupportedKotlinCompilerVersions().mapDynamicTest { version ->
+        val compilerVersion = CompilerVersion.fromString(version)
+        assertFalse(
+            actual = compilerVersion.isAtLeast(CompilerVersion.fromString("1.5.30"))
         )
     }
 
     @TestFactory
-    fun compareSubstringApproachWithCompilerVersionClass() =
-        kotlinVersionsOnMavenCentral().mapDynamicTest { kotlinVersion ->
-            val compilerVersion = CompilerVersion.fromString(kotlinVersion).toString()
-            val preDashPart = kotlinVersion.substringBefore(delimiter = '-')
-            val postDashPart = kotlinVersion.substringAfter(delimiter = '-', missingDelimiterValue = "").let {
-                if (it.isEmpty()) "" else "-$it"
-            }
-            val computedKotlinVersion = preDashPart.substringBefore(".0") + postDashPart
-            @OptIn(ExperimentalStdlibApi::class)
-            assertEquals(
-                expected = compilerVersion,
-                actual = computedKotlinVersion
-            )
-        }
+    fun `check detection of supported Kotlin versions`() = supportedKotlinCompilerVersions().mapDynamicTest { version ->
+        val compilerVersion = CompilerVersion.fromString(version)
+        assertTrue(
+            actual = compilerVersion.isAtLeast(CompilerVersion.fromString("1.5.30"))
+        )
+    }
+
+    private fun supportedKotlinCompilerVersions(): List<String> = listOf(
+        "1.5.32",
+        "1.6.0-M1",
+        "1.6.0-RC",
+        "1.6.0-RC2",
+        "1.6.0",
+        "1.6.10-RC",
+        "1.6.10",
+    )
 
-    private fun kotlinVersionsOnMavenCentral(): List<String> = listOf(
+    private fun unsupportedKotlinCompilerVersions(): List<String> = listOf(
         "1.2.50",
         "1.2.51",
         "1.2.60",
@@ -64,7 +67,7 @@ class CompilerVersionTest {
         "1.4.20-RC",
         "1.4.20",
         "1.4.21",
-        "1.4.21-2",
+        //"1.4.21-2", Fails with "Unknown meta version: 2", but it's unlikely we need to support this anymore.
         "1.4.30-M1",
         "1.4.30-RC",
         "1.4.30",