Merge #5579

5579: IDE: show parent folder name in editor tab for lib.rs, main.rs and Cargo.toml r=mchernyavsky a=Kobzol

Fixes: #1410

Co-authored-by: Jakub Beránek <berykubik@gmail.com>

src/main/kotlin/org/rust/ide/miscExtensions/RsFileTabTitleProvider.kt

@@ -0,0 +1,42 @@
+/*
+ * Use of this source code is governed by the MIT license that can be
+ * found in the LICENSE file.
+ */
+
+package org.rust.ide.miscExtensions
+
+import com.intellij.ide.ui.UISettings
+import com.intellij.openapi.fileEditor.UniqueVFilePathBuilder
+import com.intellij.openapi.fileEditor.impl.UniqueNameEditorTabTitleProvider
+import com.intellij.openapi.project.DumbService
+import com.intellij.openapi.project.Project
+import com.intellij.openapi.vfs.VirtualFile
+import org.rust.cargo.CargoConstants
+import org.rust.lang.RsConstants
+import org.rust.lang.core.psi.isRustFile
+import java.io.File
+
+class RsFileTabTitleProvider : UniqueNameEditorTabTitleProvider() {
+    override fun getEditorTabTitle(project: Project, file: VirtualFile): String? {
+        if (!((file.isRustFile && file.name in EXPLICIT_FILES) || file.name == CargoConstants.MANIFEST_FILE)) {
+            return null
+        }
+
+        val uiSettings = UISettings.instanceOrNull
+        if (uiSettings == null || !uiSettings.showDirectoryForNonUniqueFilenames || DumbService.isDumb(project)) {
+            return null
+        }
+
+        val uniqueName = UniqueVFilePathBuilder.getInstance().getUniqueVirtualFilePath(project, file)
+        val tabText = getEditorTabText(uniqueName, File.separator, uiSettings.hideKnownExtensionInTabs)
+        return tabText.takeUnless { it == file.name }
+    }
+
+    companion object {
+        private val EXPLICIT_FILES = setOf(
+            RsConstants.MOD_RS_FILE,
+            RsConstants.LIB_RS_FILE,
+            RsConstants.MAIN_RS_FILE
+        )
+    }
+}

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

@@ -870,7 +870,7 @@
 
         <!-- Editor Tab Title Providers -->
 
-        <editorTabTitleProvider implementation="org.rust.ide.miscExtensions.RsModTabTitleProvider"/>
+        <editorTabTitleProvider implementation="org.rust.ide.miscExtensions.RsFileTabTitleProvider"/>
 
         <!-- Refactoring -->