Initial support for reformatting by Ormolu by replacing custom Hindent and Stylish-Haskell paths by Ormolu path.

src/main/scala/intellij/haskell/HTool.scala

@@ -21,4 +21,10 @@ object HTool {
   case object StylishHaskell extends HTool {
     def name: String = "stylish-haskell"
   }
+
+  case object Ormolu extends HTool {
+    def name: String = "ormolu"
+
+  }
+
 }

src/main/scala/intellij/haskell/action/HaskellReformatAction.scala

@@ -21,6 +21,7 @@ import com.intellij.openapi.actionSystem.{AnActionEvent, Presentation}
 import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiFile
 import intellij.haskell.external.component.StackProjectManager
+import intellij.haskell.settings.HaskellSettingsState
 import intellij.haskell.util.{HaskellEditorUtil, HaskellFileUtil}
 
 class HaskellReformatAction extends ReformatCodeAction {
@@ -32,7 +33,7 @@ class HaskellReformatAction extends ReformatCodeAction {
     ActionUtil.findActionContext(actionEvent).foreach(actionContext => {
       val psiFile = actionContext.psiFile
       if (HaskellFileUtil.isHaskellFile(psiFile)) {
-        HaskellEditorUtil.enableExternalAction(actionEvent, (project: Project) => StackProjectManager.isStylishHaskellAvailable(project) && StackProjectManager.isHindentAvailable(project))
+        HaskellEditorUtil.enableExternalAction(actionEvent, (project: Project) => (StackProjectManager.isStylishHaskellAvailable(project) && StackProjectManager.isHindentAvailable(project)) || HaskellReformatAction.reformatByOrmolu)
       } else {
         super.update(actionEvent)
       }
@@ -45,10 +46,10 @@ class HaskellReformatAction extends ReformatCodeAction {
       if (HaskellFileUtil.isHaskellFile(psiFile)) {
         val selectionModel = actionContext.selectionModel
         selectionModel match {
-          case Some(_) =>
+          case Some(_) if StackProjectManager.isHindentAvailable(actionEvent.getProject) =>
             HindentReformatAction.format(psiFile, selectionModel.map(m =>
               HindentReformatAction.translateSelectionModelToSelectionContext(m)))
-          case None => HaskellReformatAction.reformatFile(psiFile)
+          case _ => HaskellReformatAction.reformatFile(psiFile)
         }
       } else {
         super.actionPerformed(actionEvent)
@@ -59,9 +60,17 @@ class HaskellReformatAction extends ReformatCodeAction {
 
 object HaskellReformatAction {
 
+  def reformatByOrmolu: Boolean = {
+    HaskellSettingsState.ormoluPath.isDefined
+  }
+
   def reformatFile(psiFile: PsiFile): Boolean = {
-    HindentReformatAction.format(psiFile)
-    StylishHaskellReformatAction.format(psiFile)
+    HaskellSettingsState.ormoluPath match {
+      case Some(p) => OrmoluReformatAction.format(psiFile, p)
+      case None =>
+        HindentReformatAction.format(psiFile)
+        StylishHaskellReformatAction.format(psiFile)
+    }
     true
   }
 }

src/main/scala/intellij/haskell/action/HindentReformatAction.scala

@@ -26,7 +26,6 @@ import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiFile
 import intellij.haskell.external.component.StackProjectManager
 import intellij.haskell.external.execution.CommandLine
-import intellij.haskell.settings.HaskellSettingsState
 import intellij.haskell.util._
 import intellij.haskell.{GlobalInfo, HTool, HaskellLanguage, HaskellNotificationGroup}
 
@@ -52,7 +51,7 @@ class HindentReformatAction extends AnAction {
 }
 
 object HindentReformatAction {
-  private def hindentPath = HaskellSettingsState.hindentPath.getOrElse(GlobalInfo.defaultHindentPath.toString)
+  private def hindentPath = GlobalInfo.defaultHindentPath.toString
 
   def format(psiFile: PsiFile, selectionContext: Option[SelectionContext] = None): Boolean = {
     val lineLength = CodeStyle.getSettings(psiFile.getProject).getRightMargin(HaskellLanguage.Instance)

src/main/scala/intellij/haskell/action/OrmoluReformatAction.scala

@@ -0,0 +1,77 @@
+/*
+ * Copyright 2014-2019 Rik van der Kleij
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package intellij.haskell.action
+
+import com.intellij.execution.process.ProcessOutput
+import com.intellij.openapi.actionSystem.{AnAction, AnActionEvent}
+import com.intellij.openapi.application.ApplicationManager
+import com.intellij.openapi.project.Project
+import com.intellij.psi.PsiFile
+import intellij.haskell.external.execution.CommandLine
+import intellij.haskell.settings.HaskellSettingsState
+import intellij.haskell.util._
+import intellij.haskell.{HTool, HaskellNotificationGroup}
+
+sealed case class SelectionContext(start: Int, end: Int, text: String)
+
+class OrmoluReformatAction extends AnAction {
+
+  override def update(actionEvent: AnActionEvent): Unit = {
+    HaskellEditorUtil.enableExternalAction(actionEvent, (project: Project) => HaskellReformatAction.reformatByOrmolu)
+  }
+
+  override def actionPerformed(actionEvent: AnActionEvent): Unit = {
+    ActionUtil.findActionContext(actionEvent).foreach { actionContext =>
+      val psiFile = actionContext.psiFile
+      HaskellSettingsState.ormoluPath match {
+        case Some(p) => OrmoluReformatAction.format(psiFile, p)
+        case None => ()
+      }
+    }
+  }
+}
+
+object OrmoluReformatAction {
+
+  def format(psiFile: PsiFile, ormoluPath: String): Unit = {
+    val project = psiFile.getProject
+    HaskellFileUtil.saveFile(psiFile)
+
+    HaskellFileUtil.getAbsolutePath(psiFile) match {
+      case Some(path) =>
+        val processOutputFuture = ApplicationManager.getApplication.executeOnPooledThread(ScalaUtil.callable[ProcessOutput] {
+          CommandLine.run(project, ormoluPath, Seq(path))
+        })
+
+        FutureUtil.waitForValue(project, processOutputFuture, s"reformatting by ${HTool.Ormolu.name}") match {
+          case None => ()
+          case Some(processOutput) =>
+            if (processOutput.getStderrLines.isEmpty) {
+              HaskellFileUtil.saveFileWithNewContent(psiFile, processOutput.getStdout)
+            } else {
+              HaskellNotificationGroup.logInfoEvent(project, s"Error while reformatting by `${HTool.Ormolu.name}`. Error: ${processOutput.getStderr}")
+            }
+        }
+      case None => HaskellNotificationGroup.logWarningBalloonEvent(psiFile.getProject, s"Can not reformat file because could not determine path for file `${psiFile.getName}`. File exists only in memory")
+    }
+  }
+
+
+  def versionInfo(project: Project): String = {
+    HaskellSettingsState.ormoluPath.map(p => CommandLine.run(project, p, Seq("--version")).getStdout).getOrElse("-")
+  }
+}

src/main/scala/intellij/haskell/action/StylishHaskellReformatAction.scala

@@ -23,7 +23,6 @@ import com.intellij.openapi.project.Project
 import com.intellij.psi.PsiFile
 import intellij.haskell.external.component.StackProjectManager
 import intellij.haskell.external.execution.CommandLine
-import intellij.haskell.settings.HaskellSettingsState
 import intellij.haskell.util.{FutureUtil, HaskellEditorUtil, HaskellFileUtil, ScalaUtil}
 import intellij.haskell.{GlobalInfo, HTool, HaskellNotificationGroup}
 
@@ -41,7 +40,7 @@ class StylishHaskellReformatAction extends AnAction {
 }
 
 object StylishHaskellReformatAction {
-  private def stylishHaskellPath = HaskellSettingsState.stylishHaskellPath.getOrElse(GlobalInfo.defaultStylishHaskellPath.toString)
+  private def stylishHaskellPath = GlobalInfo.defaultStylishHaskellPath.toString
 
   def versionInfo(project: Project): String = {
     if (StackProjectManager.isStylishHaskellAvailable(project)) {

src/main/scala/intellij/haskell/external/execution/CommandLine.scala

@@ -75,7 +75,7 @@ object CommandLine {
     val commandLine = createCommandLine(workDir, commandPath, arguments)
 
     if (!logOutput) {
-      HaskellNotificationGroup.logInfoEvent(project, s"Executing: `${commandLine.getCommandLineString}`")
+      HaskellNotificationGroup.logInfoEvent(project, s"Executing: ${commandLine.getCommandLineString} ")
     }
 
     val processHandler = createProcessHandler(project, commandLine, logOutput)

src/main/scala/intellij/haskell/settings/HaskellConfigurable.scala

@@ -34,6 +34,7 @@ class HaskellConfigurable extends Configurable {
   private val hindentPathField = new JTextField
   private val hlintPathField = new JTextField
   private val hooglePathField = new JTextField
+  private val ormoluPathField = new JTextField
   private val stylishHaskellPathField = new JTextField
   private val useCustomToolsToggle = new JCheckBox
   private val extraStackArgumentsField = new JTextField
@@ -54,6 +55,7 @@ class HaskellConfigurable extends Configurable {
       hlintPathField.setVisible(visible)
       hooglePathField.setVisible(visible)
       stylishHaskellPathField.setVisible(visible)
+      ormoluPathField.setVisible(visible)
     }
 
     toggleToolPathsVisibility()
@@ -68,10 +70,9 @@ class HaskellConfigurable extends Configurable {
     hlintOptionsField.getDocument.addDocumentListener(docListener)
     replTimeoutField.getDocument.addDocumentListener(docListener)
     newProjectTemplateNameField.getDocument.addDocumentListener(docListener)
-    hindentPathField.getDocument.addDocumentListener(docListener)
     hlintPathField.getDocument.addDocumentListener(docListener)
     hooglePathField.getDocument.addDocumentListener(docListener)
-    stylishHaskellPathField.getDocument.addDocumentListener(docListener)
+    ormoluPathField.getDocument.addDocumentListener(docListener)
     useSystemGhcToggle.addChangeListener { _ =>
       isModifiedByUser = true
     }
@@ -126,10 +127,9 @@ class HaskellConfigurable extends Configurable {
       (new JLabel(NewProjectTemplateName), newProjectTemplateNameField),
       (new JLabel(BuildToolsUsingSystemGhc), useSystemGhcToggle),
       (new JLabel(UseCustomTool), useCustomToolsToggle),
-      (new JLabel(HindentPath), hindentPathField),
       (new JLabel(HlintPath), hlintPathField),
       (new JLabel(HooglePath), hooglePathField),
-      (new JLabel(StylishHaskellPath), stylishHaskellPathField),
+      (new JLabel(OrmoluPath), ormoluPathField),
       (new JLabel(""), afterRestartLabel)
     )
 
@@ -163,10 +163,9 @@ class HaskellConfigurable extends Configurable {
     state.hlintOptions = hlintOptionsField.getText
     state.useSystemGhc = useSystemGhcToggle.isSelected
     state.newProjectTemplateName = newProjectTemplateNameField.getText
-    state.hindentPath = hindentPathField.getText
     state.hlintPath = hlintPathField.getText
     state.hooglePath = hooglePathField.getText
-    state.stylishHaskellPath = stylishHaskellPathField.getText
+    state.ormoluPath = ormoluPathField.getText
     state.customTools = useCustomToolsToggle.isSelected
     state.extraStackArguments = extraStackArgumentsField.getText
   }
@@ -192,17 +191,16 @@ class HaskellConfigurable extends Configurable {
 
   private def validateCustomTools(): Unit = {
     if (useCustomToolsToggle.isSelected) {
-      if (hindentPathField.getText.trim.isEmpty ||
-        hlintPathField.getText.trim.isEmpty ||
-        hooglePathField.getText.trim.isEmpty ||
-        stylishHaskellPathField.getText.trim.isEmpty) {
+      if (
+        ormoluPathField.getText.trim.isEmpty ||
+          hlintPathField.getText.trim.isEmpty ||
+          hooglePathField.getText.trim.isEmpty) {
         throw new ConfigurationException(s"All Haskell tools paths have to be set")
       }
 
-      checkFileExists(hindentPathField.getText)
       checkFileExists(hlintPathField.getText)
       checkFileExists(hooglePathField.getText)
-      checkFileExists(stylishHaskellPathField.getText)
+      checkFileExists(ormoluPathField.getText)
     }
   }
 
@@ -217,10 +215,9 @@ class HaskellConfigurable extends Configurable {
     useSystemGhcToggle.setSelected(state.useSystemGhc)
     replTimeoutField.setText(state.replTimeout.toString)
     newProjectTemplateNameField.setText(state.newProjectTemplateName)
-    hindentPathField.setText(state.hindentPath)
     hlintPathField.setText(state.hlintPath)
     hooglePathField.setText(state.hooglePath)
-    stylishHaskellPathField.setText(state.stylishHaskellPath)
+    ormoluPathField.setText(state.ormoluPath)
     useCustomToolsToggle.setSelected(state.customTools)
     extraStackArgumentsField.setText(state.extraStackArguments)
   }
@@ -235,6 +232,7 @@ object HaskellConfigurable {
   final val HlintPath = "Hlint path"
   final val HooglePath = "Hoogle path"
   final val StylishHaskellPath = "Stylish Haskell path"
+  final val OrmoluPath = "Ormolu path"
   final val UseCustomTool = "Use custom Haskell tools *"
   final val CustomToolPathWarning =
     """WARNING! Specifying a path for a Haskell tool will override the default

src/main/scala/intellij/haskell/settings/HaskellSettingsPersistentStateComponent.java

@@ -54,10 +54,9 @@ public class HaskellSettingsPersistentStateComponent implements PersistentStateC
         public Boolean reformatCodeBeforeCommit = false;
         public Boolean optimizeImportsBeforeCommit = false;
         public String newProjectTemplateName = "new-template";
-        public String hindentPath = "";
         public String hlintPath = "";
         public String hooglePath = "";
-        public String stylishHaskellPath = "";
+        public String ormoluPath = "";
         public Boolean customTools = false;
         public String extraStackArguments = "";
     }

src/main/scala/intellij/haskell/settings/HaskellSettingsState.scala

@@ -55,10 +55,6 @@ object HaskellSettingsState {
     state.customTools
   }
 
-  def hindentPath: Option[String] = {
-    Option.when(customTools && state.hindentPath.nonEmpty)(state.hindentPath)
-  }
-
   def hlintPath: Option[String] = {
     Option.when(customTools && state.hlintPath.nonEmpty)(state.hlintPath)
   }
@@ -67,8 +63,8 @@ object HaskellSettingsState {
     Option.when(customTools && state.hooglePath.nonEmpty)(state.hooglePath)
   }
 
-  def stylishHaskellPath: Option[String] = {
-    Option.when(customTools && state.stylishHaskellPath.nonEmpty)(state.stylishHaskellPath)
+  def ormoluPath: Option[String] = {
+    Option.when(customTools && state.ormoluPath.nonEmpty)(state.ormoluPath)
   }
 
   def useCustomTools: Boolean = {