Fix 11102 by allowing users to add local bst files to preview layout list

CHANGELOG.md

@@ -18,6 +18,7 @@ Note that this project **does not** adhere to [Semantic Versioning](https://semv
 - We added tooltip on main table cells that shows cell content or cell content and entry preview if set in preferences. [10925](https://github.com/JabRef/jabref/issues/10925)
 - We added the ability to add a keyword/crossref when typing the separator character (e.g., comma) in the keywords/crossref fields. [#11178](https://github.com/JabRef/jabref/issues/11178)
 - We added an exporter and improved the importer for Endnote XML format. [#11137](https://github.com/JabRef/jabref/issues/11137)
+- We added a button in gui to give users an easy option to select and add local bst files to available styles in preview layout list. [#11102](https://github.com/JabRef/jabref/issues/11102)
 
 ### Changed
 

src/main/java/org/jabref/gui/preferences/preview/PreviewTab.fxml

@@ -22,6 +22,7 @@
     <CheckBox fx:id="showAsTabCheckBox" text="%Show preview as a tab in entry editor"/>
     <CheckBox fx:id="showPreviewTooltipCheckBox" text="Show preview in entry table tooltip"/>
     <HBox spacing="4.0">
+        <Button fx:id="bstFileButton" text="Select BST File" onAction="#selectBstFile" />
         <VBox spacing="4.0" HBox.hgrow="ALWAYS">
             <Label text="%Available" styleClass="sectionHeader"/>
             <CustomTextField fx:id="searchBox" promptText="%Filter" VBox.vgrow="NEVER" prefHeight="20.0"/>

src/main/java/org/jabref/gui/preferences/preview/PreviewTab.java

@@ -1,10 +1,13 @@
 package org.jabref.gui.preferences.preview;
 
+import java.io.File;
+import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.List;
 
 import javafx.application.Platform;
 import javafx.beans.property.ListProperty;
+import javafx.event.ActionEvent;
 import javafx.fxml.FXML;
 import javafx.scene.control.Button;
 import javafx.scene.control.CheckBox;
@@ -18,6 +21,7 @@
 import javafx.scene.input.KeyEvent;
 import javafx.scene.input.MouseEvent;
 import javafx.scene.input.TransferMode;
+import javafx.stage.FileChooser;
 
 import org.jabref.gui.Globals;
 import org.jabref.gui.StateManager;
@@ -32,6 +36,7 @@
 import org.jabref.gui.util.BindingsHelper;
 import org.jabref.gui.util.IconValidationDecorator;
 import org.jabref.gui.util.ViewModelListCellFactory;
+import org.jabref.logic.bst.BstPreviewLayout;
 import org.jabref.logic.l10n.Localization;
 import org.jabref.logic.preview.PreviewLayout;
 import org.jabref.logic.util.TestEntry;
@@ -104,6 +109,20 @@ public String getTabName() {
         return Localization.lang("Entry preview");
     }
 
+    @FXML
+    private void selectBstFile(ActionEvent event) {
+    FileChooser fileChooser = new FileChooser();
+    fileChooser.setTitle("Select BST File");
+    fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter("BST Files", "*.bst"));
+
+    File selectedFile = fileChooser.showOpenDialog(null);
+    if (selectedFile != null) {
+        String filePath = selectedFile.getAbsolutePath();
+        BstPreviewLayout bstPreviewLayout = new BstPreviewLayout(Path.of(filePath));
+        viewModel.availableListProperty().add(bstPreviewLayout);
+    }
+}
+
     public void initialize() {
         this.viewModel = new PreviewTabViewModel(dialogService, preferencesService.getPreviewPreferences(), taskExecutor, stateManager);
         lastKeyPressTime = System.currentTimeMillis();

src/main/java/org/jabref/gui/preferences/preview/PreviewTabViewModel.java

@@ -33,6 +33,7 @@
 import org.jabref.gui.util.CustomLocalDragboard;
 import org.jabref.gui.util.NoSelectionModel;
 import org.jabref.gui.util.TaskExecutor;
+import org.jabref.logic.bst.BstPreviewLayout;
 import org.jabref.logic.citationstyle.CitationStyle;
 import org.jabref.logic.citationstyle.CitationStylePreviewLayout;
 import org.jabref.logic.l10n.Localization;
@@ -153,12 +154,16 @@ public void setPreviewLayout(PreviewLayout selectedLayout) {
                     Localization.lang("Parsing error") + ": " + Localization.lang("illegal backslash expression"), exception);
         }
 
-        if (selectedLayout instanceof TextBasedPreviewLayout layout) {
-            sourceTextProperty.setValue(layout.getText().replace("__NEWLINE__", "\n"));
-            selectedIsEditableProperty.setValue(true);
+        if (selectedLayout instanceof BstPreviewLayout) {
+            // needs implementation of getSource() for bst layout otherwise throwing runtime error.
         } else {
-            sourceTextProperty.setValue(((CitationStylePreviewLayout) selectedLayout).getSource());
-            selectedIsEditableProperty.setValue(false);
+            if (selectedLayout instanceof TextBasedPreviewLayout layout) {
+                sourceTextProperty.setValue(layout.getText().replace("__NEWLINE__", "\n"));
+                selectedIsEditableProperty.setValue(true);
+            } else {
+                sourceTextProperty.setValue(((CitationStylePreviewLayout) selectedLayout).getSource());
+                selectedIsEditableProperty.setValue(false);
+            }
         }
     }