Change the default location for Enso projects

app/ide-desktop/lib/project-manager-shim/src/desktopEnvironment.ts

@@ -0,0 +1,81 @@
+/**
+ * @file This module contains the logic for the detection of user-specific desktop environment attributes.
+ */
+
+import * as childProcess from 'node:child_process'
+import * as os from 'node:os'
+import * as path from 'node:path'
+
+export const DOCUMENTS = getDocumentsPath()
+
+const CHILD_PROCESS_TIMEOUT = 3000
+
+/**
+ * Detects path of the user documents directory depending on the operating system.
+ */
+function getDocumentsPath(): string | undefined {
+    if (process.platform === 'linux') {
+        return getLinuxDocumentsPath()
+    } else if (process.platform === 'darwin') {
+        return getMacOsDocumentsPath()
+    } else if (process.platform === 'win32') {
+        return getWindowsDocumentsPath()
+    } else {
+        return
+    }
+}
+
+/**
+ * Returns the user documents path on Linux.
+ */
+function getLinuxDocumentsPath(): string {
+    const xdgDocumentsPath = getXdgDocumentsPath()
+
+    return xdgDocumentsPath ?? path.join(os.homedir(), 'enso')
+}
+
+/**
+ * Gets the documents directory from the XDG directory management system.
+ */
+function getXdgDocumentsPath(): string | undefined {
+    const out = childProcess.spawnSync('xdg-user-dir', ['DOCUMENTS'], {
+        timeout: CHILD_PROCESS_TIMEOUT,
+    })
+
+    if (out.error !== undefined) {
+        return
+    } else {
+        return out.stdout.toString().trim()
+    }
+}
+
+/**
+ * Get the user documents path. On macOS, `Documents` acts as a symlink pointing to the
+ * real locale-specific user documents directory.
+ */
+function getMacOsDocumentsPath(): string {
+    return path.join(os.homedir(), 'Documents')
+}
+
+/**
+ * Get the path to the `My Documents` Windows directory.
+ */
+function getWindowsDocumentsPath(): string | undefined {
+    const out = childProcess.spawnSync(
+        'reg',
+        [
+            'query',
+            '"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellFolders"',
+            '/v',
+            'personal',
+        ],
+        { timeout: CHILD_PROCESS_TIMEOUT }
+    )
+
+    if (out.error !== undefined) {
+        return
+    } else {
+        const stdoutString = out.stdout.toString()
+        return stdoutString.split('\\s\\s+')[4]
+    }
+}

app/ide-desktop/lib/project-manager-shim/src/projectManagement.ts

@@ -17,6 +17,7 @@ import * as tar from 'tar'
 
 import * as common from 'enso-common'
 import * as buildUtils from 'enso-common/src/buildUtils'
+import * as desktopEnvironment from './desktopEnvironment'
 
 const logger = console
 
@@ -369,7 +370,12 @@ export function getProjectRoot(subtreePath: string): string | null {
 
 /** Get the directory that stores Enso projects. */
 export function getProjectsDirectory(): string {
-    return pathModule.join(os.homedir(), 'enso', 'projects')
+    const documentsPath = desktopEnvironment.DOCUMENTS
+    if (documentsPath === undefined) {
+        return pathModule.join(os.homedir(), 'enso', 'projects')
+    } else {
+        return pathModule.join(documentsPath, 'enso-projects')
+    }
 }
 
 /** Check if the given project is installed, i.e. can be opened with the Project Manager. */

app/ide-desktop/lib/project-manager-shim/src/projectManagerShimMiddleware.ts

@@ -3,7 +3,6 @@
 import * as fs from 'node:fs/promises'
 import * as fsSync from 'node:fs'
 import * as http from 'node:http'
-import * as os from 'node:os'
 import * as path from 'node:path'
 
 import * as isHiddenFile from 'is-hidden-file'
@@ -22,7 +21,7 @@ import * as projectManagement from './projectManagement'
 const HTTP_STATUS_OK = 200
 const HTTP_STATUS_BAD_REQUEST = 400
 const HTTP_STATUS_NOT_FOUND = 404
-const PROJECTS_ROOT_DIRECTORY = path.join(os.homedir(), 'enso/projects')
+const PROJECTS_ROOT_DIRECTORY = projectManagement.getProjectsDirectory()
 
 // =============
 // === Types ===

build.sbt

@@ -1120,6 +1120,7 @@ lazy val `project-manager` = (project in file("lib/scala/project-manager"))
       .value
   )
   .dependsOn(`akka-native`)
+  .dependsOn(`desktop-environment`)
   .dependsOn(`version-output`)
   .dependsOn(editions)
   .dependsOn(`edition-updater`)
@@ -2791,6 +2792,17 @@ lazy val `benchmarks-common` =
     )
     .dependsOn(`polyglot-api`)
 
+lazy val `desktop-environment` =
+  project
+    .in(file("lib/java/desktop-environment"))
+    .settings(
+      frgaalJavaCompilerSetting,
+      libraryDependencies ++= Seq(
+        "junit"          % "junit"           % junitVersion   % Test,
+        "com.github.sbt" % "junit-interface" % junitIfVersion % Test
+      )
+    )
+
 lazy val `bench-processor` = (project in file("lib/scala/bench-processor"))
   .settings(
     frgaalJavaCompilerSetting,

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/Platform.java

@@ -0,0 +1,34 @@
+package org.enso.desktopenvironment;
+
+import org.enso.desktopenvironment.directories.Directories;
+import org.enso.desktopenvironment.directories.DirectoriesFactory;
+
+public final class Platform {
+
+  private static final String OS_NAME = "os.name";
+  private static final String LINUX = "linux";
+  private static final String MAC = "mac";
+  private static final String WINDOWS = "windows";
+
+  private Platform() {}
+
+  public static Directories getDirectories() {
+    return DirectoriesFactory.getInstance();
+  }
+
+  public static String getOsName() {
+    return System.getProperty(OS_NAME);
+  }
+
+  public static boolean isLinux() {
+    return System.getProperty(OS_NAME).toLowerCase().contains(LINUX);
+  }
+
+  public static boolean isMacOs() {
+    return System.getProperty(OS_NAME).toLowerCase().contains(MAC);
+  }
+
+  public static boolean isWindows() {
+    return System.getProperty(OS_NAME).toLowerCase().contains(WINDOWS);
+  }
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/Directories.java

@@ -0,0 +1,12 @@
+package org.enso.desktopenvironment.directories;
+
+import java.nio.file.Path;
+
+public interface Directories {
+
+  default Path getUserHome() {
+    return Path.of(System.getProperty("user.home"));
+  }
+
+  Path getDocuments() throws DirectoriesException;
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/DirectoriesException.java

@@ -0,0 +1,15 @@
+package org.enso.desktopenvironment.directories;
+
+import java.io.IOException;
+
+/** Indicates an issue when accessing user directories. */
+public final class DirectoriesException extends IOException {
+
+  public DirectoriesException(String message) {
+    super(message);
+  }
+
+  public DirectoriesException(String message, Throwable cause) {
+    super(message, cause);
+  }
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/DirectoriesFactory.java

@@ -0,0 +1,30 @@
+package org.enso.desktopenvironment.directories;
+
+import org.enso.desktopenvironment.Platform;
+
+public final class DirectoriesFactory {
+
+  private static final Directories INSTANCE = initDirectories();
+
+  private static Directories initDirectories() {
+    if (Platform.isLinux()) {
+      return new LinuxDirectories();
+    }
+
+    if (Platform.isMacOs()) {
+      return new MacOsDirectories();
+    }
+
+    if (Platform.isWindows()) {
+      return new WindowsDirectories();
+    }
+
+    throw new UnsupportedOperationException("Unsupported OS '" + Platform.getOsName() + "'");
+  }
+
+  private DirectoriesFactory() {}
+
+  public static Directories getInstance() {
+    return INSTANCE;
+  }
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/LinuxDirectories.java

@@ -0,0 +1,38 @@
+package org.enso.desktopenvironment.directories;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+
+class LinuxDirectories implements Directories {
+
+  private static final String[] PROCESS_XDG_DOCUMENTS = new String[] {"xdg-user-dir", "DOCUMENTS"};
+
+  /**
+   * Get the user 'Documents' directory.
+   *
+   * <p>Tries to obtain the documents directory from the XDG directory management system if
+   * available and falls back to {@code $HOME/enso}.
+   *
+   * @return the path to the user documents directory.
+   */
+  @Override
+  public Path getDocuments() {
+    try {
+      return getXdgDocuments();
+    } catch (IOException | InterruptedException e) {
+      return getUserHome().resolve("enso");
+    }
+  }
+
+  private Path getXdgDocuments() throws IOException, InterruptedException {
+    var process = new ProcessBuilder(PROCESS_XDG_DOCUMENTS).start();
+    process.waitFor(3, TimeUnit.SECONDS);
+
+    var documentsString =
+        new String(process.getInputStream().readAllBytes(), StandardCharsets.UTF_8);
+
+    return Path.of(documentsString.trim());
+  }
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/MacOsDirectories.java

@@ -0,0 +1,27 @@
+package org.enso.desktopenvironment.directories;
+
+import java.io.IOException;
+import java.nio.file.Path;
+
+class MacOsDirectories implements Directories {
+
+  private static final String DOCUMENTS = "Documents";
+
+  /**
+   * Get the user documents path.
+   *
+   * <p>On macOS, the 'Documents' directory acts like a symlink and points to the real
+   * locale-dependent user documents folder.
+   *
+   * @return the path to the user documents directory.
+   * @throws DirectoriesException when unable to resolve the real documents path.
+   */
+  @Override
+  public Path getDocuments() throws DirectoriesException {
+    try {
+      return getUserHome().resolve(DOCUMENTS).toRealPath();
+    } catch (IOException e) {
+      throw new DirectoriesException("Failed to resolve real MacOs documents path", e);
+    }
+  }
+}

lib/java/desktop-environment/src/main/java/org/enso/desktopenvironment/directories/WindowsDirectories.java

@@ -0,0 +1,48 @@
+package org.enso.desktopenvironment.directories;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Path;
+import java.util.concurrent.TimeUnit;
+
+class WindowsDirectories implements Directories {
+
+  private static final String[] PROCESS_REG_QUERY =
+      new String[] {
+        "reg",
+        "query",
+        "\"HKCU\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\ShellFolders\"",
+        "/v",
+        "personal"
+      };
+
+  /**
+   * Get the path to 'My Documents' user directory.
+   *
+   * <p>Method uses the registry query that may not work on Windows XP versions and below.
+   *
+   * @return the 'My Documents' user directory path.
+   * @throws DirectoriesException when fails to detect the user documents directory.
+   */
+  @Override
+  public Path getDocuments() throws DirectoriesException {
+    try {
+      var process = new ProcessBuilder(PROCESS_REG_QUERY).start();
+      process.waitFor(3, TimeUnit.SECONDS);
+
+      var stdoutString =
+          new String(process.getInputStream().readAllBytes(), StandardCharsets.UTF_8);
+      var stdoutParts = stdoutString.split("\\s\\s+");
+      if (stdoutParts.length < 5) {
+        throw new DirectoriesException(
+            "Invalid Windows registry query output: '" + stdoutString + "'");
+      }
+
+      return Path.of(stdoutParts[4].trim());
+    } catch (IOException e) {
+      throw new DirectoriesException("Failed to run Windows registry query", e);
+    } catch (InterruptedException e) {
+      throw new DirectoriesException("Windows registry query timeout", e);
+    }
+  }
+}

lib/java/desktop-environment/src/test/java/org/enso/desktopenvironment/PlatformTest.java

@@ -0,0 +1,12 @@
+package org.enso.desktopenvironment;
+
+import org.junit.Assert;
+import org.junit.Test;
+
+public class PlatformTest {
+
+  @Test
+  public void getDirectories() {
+    Assert.assertNotNull(Platform.getDirectories());
+  }
+}