first setup of LSP languageserver

added emudbg.console_nl()

.idea/modules.xml

@@ -15,6 +15,7 @@
       <module fileurl="file://$PROJECT_DIR$/docs/docs.iml" filepath="$PROJECT_DIR$/docs/docs.iml" />
       <module fileurl="file://$PROJECT_DIR$/examples/examples.iml" filepath="$PROJECT_DIR$/examples/examples.iml" />
       <module fileurl="file://$PROJECT_DIR$/intermediate/intermediate.iml" filepath="$PROJECT_DIR$/intermediate/intermediate.iml" />
+      <module fileurl="file://$PROJECT_DIR$/languageServer/languageServer.iml" filepath="$PROJECT_DIR$/languageServer/languageServer.iml" />
       <module fileurl="file://$PROJECT_DIR$/parser/parser.iml" filepath="$PROJECT_DIR$/parser/parser.iml" />
       <module fileurl="file://$PROJECT_DIR$/.idea/modules/prog8.iml" filepath="$PROJECT_DIR$/.idea/modules/prog8.iml" />
       <module fileurl="file://$PROJECT_DIR$/simpleAst/simpleAst.iml" filepath="$PROJECT_DIR$/simpleAst/simpleAst.iml" />

codeCore/src/prog8/code/target/VMTarget.kt

@@ -3,6 +3,7 @@ package prog8.code.target
 import prog8.code.core.*
 import prog8.code.target.encodings.Encoder
 import java.nio.file.Path
+import kotlin.io.path.extension
 import kotlin.io.path.isReadable
 import kotlin.io.path.name
 import kotlin.io.path.readText
@@ -73,16 +74,11 @@ class VMTarget: ICompilationTarget,
 
         // to not have external module dependencies in our own module, we launch the virtual machine via reflection
         val vm = Class.forName("prog8.vm.VmRunner").getDeclaredConstructor().newInstance() as IVirtualMachineRunner
-        val filename = programNameWithPath.name
-        if(programNameWithPath.isReadable()) {
-            vm.runProgram(programNameWithPath.readText(), quiet)
-        } else {
-            val withExt = programNameWithPath.resolveSibling("$filename.p8ir")
-            if(withExt.isReadable())
-                vm.runProgram(withExt.readText(), quiet)
-            else
-                throw java.nio.file.NoSuchFileException(withExt.name, null, "not a .p8ir file")
-        }
+        val withExt = if(programNameWithPath.extension=="p8ir") programNameWithPath else programNameWithPath.resolveSibling("${programNameWithPath.name}.p8ir")
+        if(withExt.isReadable())
+            vm.runProgram(withExt.readText(), quiet)
+        else
+            throw java.nio.file.NoSuchFileException(withExt.name, null, "not a .p8ir file")
     }
 
     override fun isIOAddress(address: UInt): Boolean = false

codeGenIntermediate/src/prog8/codegen/intermediate/IRCodeGen.kt

@@ -70,12 +70,12 @@ class IRCodeGen(
                 val initValue = initialization?.value
                 when(initValue){
                     is PtBool -> {
-                        require(initValue.asInt()!=0) { "boolean var should not be initialized with false, it wil be set to false as part of BSS clear, initializer=$initialization" }
+                        require(initValue.asInt()!=0 || variable.zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) { "non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
                         variable.setOnetimeInitNumeric(initValue.asInt().toDouble())
                         initsToRemove += block to initialization
                     }
                     is PtNumber -> {
-                        require(initValue.number!=0.0 || variable.zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) {"non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
+                        require(initValue.number!=0.0 || variable.zpwish!=ZeropageWish.NOT_IN_ZEROPAGE) { "non-zp variable should not be initialized with 0, it will already be zeroed as part of BSS clear, initializer=$initialization" }
                         variable.setOnetimeInitNumeric(initValue.number)
                         initsToRemove += block to initialization
                     }

compiler/res/prog8lib/cx16/emudbg.p8

@@ -47,6 +47,12 @@ emudbg {
         }
     }
 
+    sub console_nl() {
+        ; write a newline to the debug output console.
+        ; because '\n' gets encoded in the x16 value for it (13) which is different than what the shell expects (10).
+        console_chrout(10)
+    }
+
     sub console_chrout(ubyte char) {
         ; note: make sure the character is in Iso encoding.
         if is_emulator()

compiler/test/codegeneration/TestVariables.kt

@@ -11,9 +11,11 @@ import prog8.ast.statements.AssignmentOrigin
 import prog8.ast.statements.ForLoop
 import prog8.ast.statements.VarDecl
 import prog8.code.ast.PtAssignment
+import prog8.code.ast.PtBool
 import prog8.code.ast.PtNumber
 import prog8.code.target.C64Target
 import prog8.code.target.Cx16Target
+import prog8.code.target.VMTarget
 import prog8tests.helpers.ErrorReporterForTests
 import prog8tests.helpers.compileText
 
@@ -229,27 +231,40 @@ main {
         val src="""
 main {
     ubyte @shared @requirezp zpvar
+    bool @shared @requirezp zpbool
     ubyte @shared @requirezp @dirty dirtyzpvar
+    bool @shared @requirezp @dirty dirtyzpbool
 
     sub start() {
         ubyte @shared @requirezp zpvar2
+        bool @shared @requirezp zpbool2
         ubyte @shared @requirezp @dirty dirtyzpvar2
+        bool @shared @requirezp @dirty dirtyzpbool2
     }
 }"""
 
         val result = compileText(Cx16Target(), false, src, outputDir, writeAssembly = true)!!.codegenAst
 
         val main = result!!.allBlocks().first { it.name=="p8b_main" }
-        main.children.size shouldBe 4
-        val zeroassignlobal =  main.children.single { it is PtAssignment } as PtAssignment
-        (zeroassignlobal.value as PtNumber).number shouldBe 0.0
-        zeroassignlobal.target.identifier!!.name shouldBe "p8b_main.p8v_zpvar"
+        main.children.size shouldBe 7
+        val zeroassignsglobal =  main.children.filterIsInstance<PtAssignment>()
+        zeroassignsglobal.size shouldBe 2
+        (zeroassignsglobal[0].value as PtNumber).number shouldBe 0.0
+        zeroassignsglobal[0].target.identifier!!.name shouldBe "p8b_main.p8v_zpvar"
+        (zeroassignsglobal[1].value as PtBool).value shouldBe false
+        zeroassignsglobal[1].target.identifier!!.name shouldBe "p8b_main.p8v_zpbool"
 
         val st = result.entrypoint()!!.children
-        st.size shouldBe 4
-        val zeroassign =  st.single { it is PtAssignment } as PtAssignment
-        (zeroassign.value as PtNumber).number shouldBe 0.0
-        zeroassign.target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_zpvar2"
+        st.size shouldBe 7
+        val zeroassigns =  st.filterIsInstance<PtAssignment>()
+        zeroassigns.size shouldBe 2
+        (zeroassigns[0].value as PtNumber).number shouldBe 0.0
+        zeroassigns[0].target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_zpvar2"
+        (zeroassigns[1].value as PtBool).value shouldBe false
+        zeroassigns[1].target.identifier!!.name shouldBe "p8b_main.p8s_start.p8v_zpbool2"
+
+
+        compileText(VMTarget(), false, src, outputDir, writeAssembly = true) shouldNotBe null
     }
 
     test("nondirty non zp variables in block scope should not be explicitly initialized to 0 (bss clear takes care of it)") {

docs/source/_static/symboldumps/skeletons-c128.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4.1 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-c128.p8

docs/source/_static/symboldumps/skeletons-c64.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4.1 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-c64.p8

docs/source/_static/symboldumps/skeletons-cx16.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4.1 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-cx16.p8
@@ -262,6 +263,7 @@ emudbg  {
     &ubyte  EMU_RECORD_WAV 
     &ubyte  EMU_SAVE_ON_EXIT 
     console_chrout  (ubyte char) 
+    console_nl  () 
     console_value1  (ubyte value) 
     console_value2  (ubyte value) 
     console_write  (str isoString) 

docs/source/_static/symboldumps/skeletons-pet32.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4.1 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-pet32.p8

docs/source/_static/symboldumps/skeletons-virtual.txt

@@ -1,5 +1,6 @@
 
-Prog8 compiler v11.4.1 by Irmen de Jong (irmen@razorvine.net)
+Prog8 compiler v11.5-SNAPSHOT by Irmen de Jong (irmen@razorvine.net)
+Prerelease version from git commit 0116fac2 in branch master
 This software is licensed under the GNU GPL 3.0, see https://www.gnu.org/licenses/gpl.html
 
 Compiling program import-all-virtual.p8

docs/source/libraries.rst

@@ -488,7 +488,17 @@ emudbg  (cx16 only)
 X16Emu Emulator debug routines, for Cx16 only.
 Allows you to interface with the emulator's debug routines/registers.
 There's stuff like ``is_emulator`` to detect if running in the emulator,
-and ``console_write`` to write a (iso) string to the emulator's console (stdout) etc.
+and ``console_write`` to write a (iso) string to the emulator's console (stdout), etc.
+
+*EOL (end of line) character handling:*
+Writing ``iso:'\n'`` to the console doesn't produce a proper new line there, because prog8 encodes
+the newline to character 13 on the X16 (this is what the X16 uses to print a newline on the screen).
+You have to explicitly output a character 10 on the console to see a newline there. You can do that in several ways::
+
+    emudbg.console_nl()
+    emudbg.console_chrout(10)
+    emudbg.console_write(iso:"hello\x0a")
+
 
 Read the `emudbg source code <https://github.com/irmen/prog8/tree/master/compiler/res/prog8lib/cx16/emudbg.p8>`_
 to see what's in there.

docs/source/todo.rst

@@ -1,8 +1,7 @@
 TODO
 ====
 
-Since fixing the missing zp-var initialization, programs grew in size again (assem)
-Are there any redundant block-level variable initializations to 0 that we can remove in peephole optimization for example?
+Port benchmarks from https://thred.github.io/c-bench-64/  to prog8 and see how it stacks up.
 
 
 STRUCTS: are being developed in their own separate branch for now, called "structs".
@@ -72,6 +71,7 @@ Libraries
 Optimizations
 -------------
 
+- Since fixing the missing zp-var initialization, programs grew in size again because STZ's reappered. Can we add more intelligent (and correct!) optimizations to remove those STZs that might be redundant again?
 - in Identifier: use typedarray of strings instead of listOf? Other places?
 - Compilation speed: try to join multiple modifications in 1 result in the AST processors instead of returning it straight away every time
 - Compare output of some Oscar64 samples to what prog8 does for the equivalent code (see https://github.com/drmortalwombat/OscarTutorials/tree/main and https://github.com/drmortalwombat/oscar64/tree/main/samples)

examples/test.p8

@@ -1,84 +1,13 @@
-%option no_sysinit
-%zeropage kernalsafe
-%import textio
-%zpallowed 224,255
-
 main {
-    uword @shared @requirezp zpvar1
-    uword @shared @requirezp zpvar2
-    uword @shared @requirezp zpvar3
-    uword @shared @requirezp zpvar4
-    uword @shared @requirezp zpvar5
-    uword @shared @requirezp @dirty dzpvar1
-    uword @shared @requirezp @dirty dzpvar2
-    uword @shared @requirezp @dirty dzpvar3
-    uword @shared @requirezp @dirty dzpvar4
-    uword @shared @requirezp @dirty dzpvar5
-    uword @shared @nozp var1
-    uword @shared @nozp var2
-    uword @shared @nozp var3
-    uword @shared @nozp var4
-    uword @shared @nozp var5
-    uword @shared @nozp @dirty dvar1
-    uword @shared @nozp @dirty dvar2
-    uword @shared @nozp @dirty dvar3
-    uword @shared @nozp @dirty dvar4
-    uword @shared @nozp @dirty dvar5
+    ubyte @shared @requirezp zpvar
+    bool @shared @requirezp zpbool
+    ubyte @shared @requirezp @dirty dirtyzpvar
+    bool @shared @requirezp @dirty dirtyzpbool
 
     sub start() {
-        txt.print("address start of zpvars: ")
-        txt.print_uw(&zpvar1)
-        txt.nl()
-        txt.print("address start of normal vars: ")
-        txt.print_uw(&var1)
-        txt.nl()
-
-        txt.print("non-dirty zp should all be 0: ")
-        txt.print_uw(zpvar1)
-        txt.spc()
-        txt.print_uw(zpvar2)
-        txt.spc()
-        txt.print_uw(zpvar3)
-        txt.spc()
-        txt.print_uw(zpvar4)
-        txt.spc()
-        txt.print_uw(zpvar5)
-        txt.nl()
-        txt.print("non-dirty should all be 0:    ")
-        txt.print_uw(var1)
-        txt.spc()
-        txt.print_uw(var2)
-        txt.spc()
-        txt.print_uw(var3)
-        txt.spc()
-        txt.print_uw(var4)
-        txt.spc()
-        txt.print_uw(var5)
-        txt.nl()
-
-        txt.print("dirty zp may be random: ")
-        txt.print_uw(dzpvar1)
-        txt.spc()
-        txt.print_uw(dzpvar2)
-        txt.spc()
-        txt.print_uw(dzpvar3)
-        txt.spc()
-        txt.print_uw(dzpvar4)
-        txt.spc()
-        txt.print_uw(dzpvar5)
-        txt.nl()
-        txt.print("dirty may be random: ")
-        txt.print_uw(dvar1)
-        txt.spc()
-        txt.print_uw(dvar2)
-        txt.spc()
-        txt.print_uw(dvar3)
-        txt.spc()
-        txt.print_uw(dvar4)
-        txt.spc()
-        txt.print_uw(dvar5)
-        txt.nl()
-
-        repeat {}
+        ubyte @shared @requirezp zpvar2
+        bool @shared @requirezp zpbool2
+        ubyte @shared @requirezp @dirty dirtyzpvar2
+        bool @shared @requirezp @dirty dirtyzpbool2
     }
 }

gradle.properties

@@ -3,4 +3,4 @@ org.gradle.console=rich
 org.gradle.parallel=true
 org.gradle.daemon=true
 kotlin.code.style=official
-version=11.4.1
+version=11.5-SNAPSHOT

languageServer/build.gradle.kts

@@ -0,0 +1,103 @@
+plugins {
+    kotlin("jvm")
+    id("application")
+}
+
+val debugPort = 8000
+val debugArgs = "-agentlib:jdwp=transport=dt_socket,server=y,address=8000,suspend=n,quiet=y"
+
+val serverMainClassName = "prog8lsp.MainKt"
+val applicationName = "prog8-language-server"
+
+application {
+    mainClass.set(serverMainClassName)
+    description = "Code completions, diagnostics and more for Prog8"
+    // applicationDefaultJvmArgs = listOf("-DkotlinLanguageServer.version=$version")
+    applicationDistribution.into("bin") {
+        filePermissions {
+            user {
+                read=true
+                execute=true
+                write=true
+            }
+            other.execute = true
+            group.execute = true
+        }
+    }
+}
+
+repositories {
+    mavenCentral()
+}
+
+dependencies {
+    implementation("org.eclipse.lsp4j:org.eclipse.lsp4j:0.24.0")
+    implementation("org.eclipse.lsp4j:org.eclipse.lsp4j.jsonrpc:0.24.0")
+}
+
+configurations.forEach { config ->
+    config.resolutionStrategy {
+        preferProjectModules()
+    }
+}
+
+sourceSets.main {
+    java.srcDir("src")
+    resources.srcDir("resources")
+}
+
+sourceSets.test {
+    java.srcDir("src")
+    resources.srcDir("resources")
+}
+
+tasks.startScripts {
+    applicationName = "prog8-language-server"
+}
+
+tasks.register<Exec>("fixFilePermissions") {
+    // When running on macOS or Linux the start script
+    // needs executable permissions to run.
+
+    onlyIf { !System.getProperty("os.name").lowercase().contains("windows") }
+    commandLine("chmod", "+x", "${tasks.installDist.get().destinationDir}/bin/prog8-language-server")
+}
+
+tasks.register<JavaExec>("debugRun") {
+    mainClass.set(serverMainClassName)
+    classpath(sourceSets.main.get().runtimeClasspath)
+    standardInput = System.`in`
+
+    jvmArgs(debugArgs)
+    doLast {
+        println("Using debug port $debugPort")
+    }
+}
+
+tasks.register<CreateStartScripts>("debugStartScripts") {
+    applicationName = "prog8-language-server"
+    mainClass.set(serverMainClassName)
+    outputDir = tasks.installDist.get().destinationDir.toPath().resolve("bin").toFile()
+    classpath = tasks.startScripts.get().classpath
+    defaultJvmOpts = listOf(debugArgs)
+}
+
+tasks.register<Sync>("installDebugDist") {
+    dependsOn("installDist")
+    finalizedBy("debugStartScripts")
+}
+
+tasks.withType<Test>() {
+    testLogging {
+        events("failed")
+        exceptionFormat = org.gradle.api.tasks.testing.logging.TestExceptionFormat.FULL
+    }
+}
+
+tasks.installDist {
+    finalizedBy("fixFilePermissions")
+}
+
+tasks.build {
+    finalizedBy("installDist")
+}

languageServer/languageServer.iml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="JAVA_MODULE" version="4">
+  <component name="NewModuleRootManager" inherit-compiler-output="true">
+    <exclude-output />
+    <content url="file://$MODULE_DIR$">
+      <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+    <orderEntry type="library" name="eclipse.lsp4j" level="project" />
+    <orderEntry type="library" name="KotlinJavaRuntime" level="project" />
+  </component>
+</module>

languageServer/src/prog8lsp/AsyncExecutor.kt

@@ -0,0 +1,34 @@
+package prog8lsp
+
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.Executors
+import java.util.concurrent.TimeUnit
+import java.util.function.Supplier
+
+private var threadCount = 0
+
+class AsyncExecutor {
+    private val workerThread = Executors.newSingleThreadExecutor { Thread(it, "async${threadCount++}") }
+
+    fun execute(task: () -> Unit) =
+        CompletableFuture.runAsync(Runnable(task), workerThread)
+
+    fun <R> compute(task: () -> R) =
+        CompletableFuture.supplyAsync(Supplier(task), workerThread)
+
+    fun <R> computeOr(defaultValue: R, task: () -> R?) =
+        CompletableFuture.supplyAsync(Supplier {
+            try {
+                task() ?: defaultValue
+            } catch (e: Exception) {
+                defaultValue
+            }
+        }, workerThread)
+
+    fun shutdown(awaitTermination: Boolean) {
+        workerThread.shutdown()
+        if (awaitTermination) {
+            workerThread.awaitTermination(Long.MAX_VALUE, TimeUnit.DAYS)
+        }
+    }
+}

languageServer/src/prog8lsp/Main.kt

@@ -0,0 +1,19 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.launch.LSPLauncher
+import java.util.concurrent.Executors
+import java.util.logging.Level
+import java.util.logging.Logger
+
+fun main(args: Array<String>) {
+    Logger.getLogger("").level = Level.INFO
+
+    val inStream = System.`in`
+    val outStream = System.out
+    val server = Prog8LanguageServer()
+    val threads = Executors.newSingleThreadExecutor { Thread(it, "client") }
+    val launcher = LSPLauncher.createServerLauncher(server, inStream, outStream, threads) { it }
+
+    server.connect(launcher.remoteProxy)
+    launcher.startListening()
+}

languageServer/src/prog8lsp/Prog8LanguageServer.kt

@@ -0,0 +1,46 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.InitializeParams
+import org.eclipse.lsp4j.InitializeResult
+import org.eclipse.lsp4j.services.*
+import java.io.Closeable
+import java.util.concurrent.CompletableFuture
+import java.util.concurrent.CompletableFuture.completedFuture
+import java.util.logging.Logger
+
+class Prog8LanguageServer: LanguageServer, LanguageClientAware, Closeable {
+    private lateinit var client: LanguageClient
+    private val textDocuments = Prog8TextDocumentService()
+    private val workspaces = Prog8WorkspaceService()
+    private val async = AsyncExecutor()
+    private val logger = Logger.getLogger(Prog8LanguageServer::class.simpleName)
+
+    override fun initialize(params: InitializeParams): CompletableFuture<InitializeResult> = async.compute {
+        logger.info("Initializing LanguageServer")
+
+        InitializeResult()
+    }
+
+    override fun shutdown(): CompletableFuture<Any> {
+        close()
+        return completedFuture(null)
+    }
+
+    override fun exit() { }
+
+    override fun getTextDocumentService(): TextDocumentService = textDocuments
+
+    override fun getWorkspaceService(): WorkspaceService = workspaces
+
+    override fun connect(client: LanguageClient) {
+        logger.info("connecting to language client")
+        this.client = client
+        workspaces.connect(client)
+        textDocuments.connect(client)
+    }
+
+    override fun close() {
+        logger.info("closing down")
+        async.shutdown(awaitTermination = true)
+    }
+}

languageServer/src/prog8lsp/Prog8TextDocumentService.kt

@@ -0,0 +1,62 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.*
+import org.eclipse.lsp4j.jsonrpc.messages.Either
+import org.eclipse.lsp4j.services.LanguageClient
+import org.eclipse.lsp4j.services.TextDocumentService
+import java.util.concurrent.CompletableFuture
+import java.util.logging.Logger
+import kotlin.system.measureTimeMillis
+
+class Prog8TextDocumentService: TextDocumentService {
+    private var client: LanguageClient? = null
+    private val async = AsyncExecutor()
+    private val logger = Logger.getLogger(Prog8TextDocumentService::class.simpleName)
+
+    fun connect(client: LanguageClient) {
+        this.client = client
+    }
+
+    override fun didOpen(params: DidOpenTextDocumentParams) {
+        logger.info("didOpen: $params")
+    }
+
+    override fun didChange(params: DidChangeTextDocumentParams) {
+        logger.info("didChange: $params")
+    }
+
+    override fun didClose(params: DidCloseTextDocumentParams) {
+        logger.info("didClose: $params")
+    }
+
+    override fun didSave(params: DidSaveTextDocumentParams) {
+        logger.info("didSave: $params")
+    }
+
+    override fun documentSymbol(params: DocumentSymbolParams): CompletableFuture<MutableList<Either<SymbolInformation, DocumentSymbol>>> = async.compute {
+        logger.info("Find symbols in ${params.textDocument.uri}")
+        val result: MutableList<Either<SymbolInformation, DocumentSymbol>>
+        val time = measureTimeMillis {
+            result = mutableListOf()
+            val range = Range(Position(1,1), Position(1,5))
+            val selectionRange = Range(Position(1,2), Position(1,10))
+            val symbol = DocumentSymbol("test-symbolName", SymbolKind.Constant, range, selectionRange)
+            result.add(Either.forRight(symbol))
+        }
+        logger.info("Finished in $time ms")
+        result
+    }
+
+    override fun completion(position: CompletionParams): CompletableFuture<Either<MutableList<CompletionItem>, CompletionList>>  = async.compute{
+        logger.info("Completion for ${position}")
+        val result: Either<MutableList<CompletionItem>, CompletionList>
+        val time = measureTimeMillis {
+            val list = CompletionList(false, listOf(CompletionItem("test-completionItem")))
+            result = Either.forRight(list)
+        }
+        logger.info("Finished in $time ms")
+        result
+    }
+
+    // TODO add all other methods that get called.... :P
+}

languageServer/src/prog8lsp/Prog8WorkspaceService.kt

@@ -0,0 +1,80 @@
+package prog8lsp
+
+import org.eclipse.lsp4j.*
+import org.eclipse.lsp4j.jsonrpc.messages.Either
+import org.eclipse.lsp4j.services.LanguageClient
+import org.eclipse.lsp4j.services.WorkspaceService
+import java.util.concurrent.CompletableFuture
+import java.util.logging.Logger
+
+class Prog8WorkspaceService: WorkspaceService {
+    private var client: LanguageClient? = null
+    private val logger = Logger.getLogger(Prog8WorkspaceService::class.simpleName)
+
+    fun connect(client: LanguageClient) {
+        this.client = client
+    }
+
+    override fun executeCommand(params: ExecuteCommandParams): CompletableFuture<Any> {
+        logger.info("executeCommand $params")
+        return super.executeCommand(params)
+    }
+
+    override fun symbol(params: WorkspaceSymbolParams): CompletableFuture<Either<MutableList<out SymbolInformation>, MutableList<out WorkspaceSymbol>>> {
+        logger.info("symbol $params")
+        return super.symbol(params)
+    }
+
+    override fun resolveWorkspaceSymbol(workspaceSymbol: WorkspaceSymbol): CompletableFuture<WorkspaceSymbol> {
+        logger.info("resolveWorkspaceSymbol $workspaceSymbol")
+        return super.resolveWorkspaceSymbol(workspaceSymbol)
+    }
+
+    override fun didChangeConfiguration(params: DidChangeConfigurationParams) {
+        logger.info("didChangeConfiguration: $params")
+    }
+
+    override fun didChangeWatchedFiles(params: DidChangeWatchedFilesParams) {
+        logger.info("didChangeWatchedFiles: $params")
+    }
+
+    override fun didChangeWorkspaceFolders(params: DidChangeWorkspaceFoldersParams) {
+        logger.info("didChangeWorkspaceFolders $params")
+        super.didChangeWorkspaceFolders(params)
+    }
+
+    override fun willCreateFiles(params: CreateFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willCreateFiles $params")
+        return super.willCreateFiles(params)
+    }
+
+    override fun didCreateFiles(params: CreateFilesParams) {
+        logger.info("didCreateFiles $params")
+        super.didCreateFiles(params)
+    }
+
+    override fun willRenameFiles(params: RenameFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willRenameFiles $params")
+        return super.willRenameFiles(params)
+    }
+
+    override fun didRenameFiles(params: RenameFilesParams) {
+        logger.info("didRenameFiles $params")
+        super.didRenameFiles(params)
+    }
+
+    override fun willDeleteFiles(params: DeleteFilesParams): CompletableFuture<WorkspaceEdit> {
+        logger.info("willDeleteFiles $params")
+        return super.willDeleteFiles(params)
+    }
+
+    override fun didDeleteFiles(params: DeleteFilesParams) {
+        logger.info("didDeleteFiles $params")
+        super.didDeleteFiles(params)
+    }
+
+    override fun diagnostic(params: WorkspaceDiagnosticParams): CompletableFuture<WorkspaceDiagnosticReport> {
+        logger.info("diagnostic $params")
+        return super.diagnostic(params)
+    }
+}

settings.gradle

@@ -10,5 +10,6 @@ include(
     ':codeGenCpu6502',
     ':codeGenExperimental',
     ':compiler',
-    ':beanshell'
+    ':beanshell',
+    ':languageServer'
 )