WIP: integration of Language Server Protocol

gradle.properties

@@ -9,7 +9,7 @@ kotlin.code.style=official
 baseIDE=idea
 
 # if you change the version of ide, also change psiViewerPluginVersion accordingly (cf https://plugins.jetbrains.com/plugin/227-psiviewer/versions)
-ideaVersion=IC-2023.3
+ideaVersion=IU-2023.3.5
 pycharmCommunityVersion=PC-2023.3
 psiViewerPluginVersion=233.2
 
@@ -30,4 +30,5 @@ enableBuildSearchableOptions=false
 # Opt-out flag for bundling Kotlin standard library.
 # See https://plugins.jetbrains.com/docs/intellij/kotlin.html#kotlin-standard-library for details.
 # suppress inspection "UnusedProperty"
-kotlin.stdlib.default.dependency = false
+kotlin.stdlib.default.dependency = false
+kotlin.incremental.useClasspathSnapshot=false

gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
-zipStorePath=wrapper/dists
+zipStorePath=wrapper/dists

gradlew

@@ -85,9 +85,6 @@ done
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -133,10 +130,13 @@ location of your Java installation."
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -197,6 +197,10 @@ if "$cygwin" || "$msys" ; then
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in

plugin/src/main/resources/META-INF/plugin.xml

@@ -24,6 +24,7 @@
          on how to target different products -->
     <depends>com.intellij.modules.platform</depends>
     <depends>com.intellij.modules.lang</depends>
+    <depends>com.intellij.modules.ultimate</depends>
 
     <xi:include href="/META-INF/opa-core.xml" xpointer="xpointer(/idea-plugin/*)"/>
 

src/main/kotlin/org/openpolicyagent/ideaplugin/ide/lsp/RegalLsp.kt

@@ -0,0 +1,27 @@
+/*
+ * Use of this source code is governed by the MIT license that can be
+ * found in the LICENSE file.
+ */
+
+package org.openpolicyagent.ideaplugin.ide.lsp
+
+import com.intellij.execution.configurations.GeneralCommandLine
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VirtualFile
+import com.intellij.platform.lsp.api.LspServerSupportProvider
+import com.intellij.platform.lsp.api.ProjectWideLspServerDescriptor
+import org.openpolicyagent.ideaplugin.lang.psi.isRegoFile
+
+
+internal class RegalLspServerSupportProvider : LspServerSupportProvider {
+    override fun fileOpened(project: Project, file: VirtualFile, serverStarter: LspServerSupportProvider.LspServerStarter) {
+        if (file.isRegoFile) {
+            serverStarter.ensureServerStarted(RegalLspServerDescriptor(project))
+        }
+    }
+}
+
+private class RegalLspServerDescriptor(project: Project) : ProjectWideLspServerDescriptor(project, "Foo") {
+    override fun isSupportedFile(file: VirtualFile) = file.isRegoFile
+    override fun createCommandLine() = GeneralCommandLine("/usr/local/bin/regal", "language-server")
+}

src/main/resources/META-INF/opa-core.xml

@@ -53,7 +53,10 @@
                              displayName="Open Policy Agent"
                              instance="org.openpolicyagent.ideaplugin.opa.project.settings.OpaOptionsConfigurable"/>
 
-</extensions>
+        <!-- LSP -->
+        <platform.lsp.serverSupportProvider implementation="org.openpolicyagent.ideaplugin.ide.lsp.RegalLspServerSupportProvider"/>
+
+    </extensions>
 
     <actions>