Improve File Manager showcase

Major visual lift-up including file icons (thanks to the Papirus icon pack)

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/FileIconRepository.java

@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: MIT */
+package atlantafx.sampler.page.showcase.filemanager;
+
+import atlantafx.sampler.Resources;
+import javafx.scene.image.Image;
+
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.Map;
+import java.util.Set;
+
+final class FileIconRepository {
+
+    private static final String IMAGE_DIRECTORY = "images/papirus/";
+    public static final Image UNKNOWN_FILE = new Image(Resources.getResourceAsStream(IMAGE_DIRECTORY + "mimetypes/text-plain.png"));
+    public static final Image FOLDER = new Image(Resources.getResourceAsStream(IMAGE_DIRECTORY + "places/folder-blue.png"));
+
+    private final Map<String, Image> cache = new HashMap<>();
+    private final Set<String> unknownMimeTypes = new HashSet<>();
+
+    public Image getByMimeType(String mimeType) {
+        if (mimeType == null || unknownMimeTypes.contains(mimeType)) { return UNKNOWN_FILE; }
+
+        var cachedImage = cache.get(mimeType);
+        if (cachedImage != null) { return cachedImage; }
+
+        var fileName = mimeType.replaceAll("/", "-") + ".png";
+
+        try {
+            var image = new Image(Resources.getResourceAsStream(IMAGE_DIRECTORY + "mimetypes/" + fileName));
+            cache.put(mimeType, image);
+            return image;
+        } catch (Exception e) {
+            unknownMimeTypes.add(mimeType);
+            return UNKNOWN_FILE;
+        }
+    }
+}

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/FileManagerPage.java

@@ -3,19 +3,21 @@ package atlantafx.sampler.page.showcase.filemanager;
 
 import atlantafx.base.controls.Breadcrumbs;
 import atlantafx.base.controls.Spacer;
-import atlantafx.base.theme.Styles;
+import atlantafx.base.theme.Tweaks;
 import atlantafx.sampler.page.showcase.ShowcasePage;
 import atlantafx.sampler.util.Containers;
 import javafx.geometry.Insets;
-import javafx.geometry.Pos;
 import javafx.scene.control.*;
 import javafx.scene.layout.BorderPane;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.Region;
+import javafx.scene.text.Text;
 import javafx.util.Callback;
 import org.kordamp.ikonli.feather.Feather;
 import org.kordamp.ikonli.javafx.FontIcon;
+import org.kordamp.ikonli.material2.Material2MZ;
 
+import java.net.URI;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.ArrayList;
@@ -23,10 +25,13 @@ import java.util.Collections;
 import java.util.List;
 import java.util.Objects;
 
-import static atlantafx.base.theme.Styles.*;
+import static atlantafx.base.theme.Styles.BUTTON_ICON;
+import static atlantafx.base.theme.Styles.FLAT;
 import static atlantafx.sampler.page.showcase.filemanager.FileList.PREDICATE_ANY;
 import static atlantafx.sampler.page.showcase.filemanager.FileList.PREDICATE_NOT_HIDDEN;
 import static atlantafx.sampler.page.showcase.filemanager.Utils.openFile;
+import static atlantafx.sampler.util.Controls.hyperlink;
+import static atlantafx.sampler.util.Controls.iconButton;
 
 public class FileManagerPage extends ShowcasePage {
 
@@ -48,36 +53,39 @@ public class FileManagerPage extends ShowcasePage {
     private void createView() {
         var topBar = new ToolBar();
 
-        var backBtn = new Button("", new FontIcon(Feather.ARROW_LEFT));
-        backBtn.getStyleClass().addAll(BUTTON_ICON, LEFT_PILL);
+        var backBtn = iconButton(Feather.ARROW_LEFT, false);
         backBtn.setOnAction(e -> model.back());
         backBtn.disableProperty().bind(model.getHistory().canGoBackProperty().not());
 
-        var forthBtn = new Button("", new FontIcon(Feather.ARROW_RIGHT));
-        forthBtn.getStyleClass().addAll(BUTTON_ICON, RIGHT_PILL);
+        var forthBtn = iconButton(Feather.ARROW_RIGHT, false);
         forthBtn.setOnAction(e -> model.forth());
         forthBtn.disableProperty().bind(model.getHistory().canGoForthProperty().not());
 
-        var backForthBox = new HBox(backBtn, forthBtn);
-        backForthBox.setAlignment(Pos.CENTER_LEFT);
-
         Breadcrumbs<Path> breadcrumbs = breadCrumbs();
         breadcrumbs.setOnCrumbAction(e -> model.navigate(e.getSelectedCrumb().getValue(), true));
 
+        var createMenuBtn = new MenuButton();
+        createMenuBtn.setText("New");
+        createMenuBtn.getItems().setAll(
+                new MenuItem("New Folder"),
+                new MenuItem("New Document")
+        );
+
         var toggleHiddenCheck = new CheckMenuItem("Show Hidden Files");
-        toggleHiddenCheck.setSelected(true);
+        toggleHiddenCheck.setSelected(false);
 
         var menuBtn = new MenuButton();
-        menuBtn.setGraphic(new FontIcon(Feather.MORE_HORIZONTAL));
-        menuBtn.getItems().setAll(
-                toggleHiddenCheck
-        );
-        menuBtn.getStyleClass().add(BUTTON_ICON);
+        menuBtn.setGraphic(new FontIcon(Material2MZ.MENU));
+        menuBtn.getItems().setAll(toggleHiddenCheck);
+        menuBtn.getStyleClass().addAll(BUTTON_ICON, Tweaks.NO_ARROW);
 
         topBar.getItems().setAll(
-                backForthBox,
+                backBtn,
+                forthBtn,
+                new Spacer(10),
                 breadcrumbs,
                 new Spacer(),
+                createMenuBtn,
                 menuBtn
         );
 
@@ -98,18 +106,31 @@ public class FileManagerPage extends ShowcasePage {
         // ~
 
         var splitPane = new SplitPane(bookmarksList, directoryView.getView());
-        splitPane.setDividerPositions(0.2, 0.8);
+        splitPane.widthProperty().addListener(
+                // set sidebar width in pixels depending on split pane width
+                (obs, old, val) -> splitPane.setDividerPosition(0, 200 / splitPane.getWidth())
+        );
+
+        var creditsBox = new HBox(5,
+                                  new Spacer(),
+                                  new Text("Inspired by"),
+                                  hyperlink("Gnome Files", URI.create("https://gitlab.gnome.org/GNOME/nautilus"))
+        );
+        creditsBox.getStyleClass().add("credits");
+        creditsBox.setPadding(new Insets(5, 0, 5, 0));
 
         var root = new BorderPane();
         root.getStyleClass().add("file-manager-showcase");
         root.getStylesheets().add(STYLESHEET_URL);
         root.setTop(topBar);
         root.setCenter(splitPane);
+        root.setBottom(creditsBox);
 
         toggleHiddenCheck.selectedProperty().addListener((obs, old, val) -> directoryView.getFileList()
                 .predicateProperty()
                 .set(val ? PREDICATE_ANY : PREDICATE_NOT_HIDDEN)
         );
+        directoryView.getFileList().predicateProperty().set(PREDICATE_NOT_HIDDEN);
 
         model.currentPathProperty().addListener((obs, old, val) -> {
             if (!Files.isReadable(val)) {
@@ -117,8 +138,9 @@ public class FileManagerPage extends ShowcasePage {
                 return;
             }
 
+            // crumb count should be calculated depending on available width
             breadcrumbs.setSelectedCrumb(
-                    Breadcrumbs.buildTreeModel(getParentPath(val, 5).toArray(Path[]::new))
+                    Breadcrumbs.buildTreeModel(getParentPath(val, 4).toArray(Path[]::new))
             );
             directoryView.setDirectory(val);
         });
@@ -130,13 +152,13 @@ public class FileManagerPage extends ShowcasePage {
     private Breadcrumbs<Path> breadCrumbs() {
         Callback<TreeItem<Path>, Button> crumbFactory = crumb -> {
             var btn = new Button(crumb.getValue().getFileName().toString());
-            btn.getStyleClass().add(Styles.FLAT);
+            btn.getStyleClass().add(FLAT);
             btn.setFocusTraversable(false);
             if (!crumb.getChildren().isEmpty()) {
                 btn.setGraphic(new FontIcon(Feather.CHEVRON_RIGHT));
             }
             btn.setContentDisplay(ContentDisplay.RIGHT);
-            btn.setStyle("-fx-padding: 6px 12px 6px 12px;");
+            btn.setStyle("-fx-padding: 6px 0 6px 6px;");
             return btn;
         };
 
@@ -144,7 +166,7 @@ public class FileManagerPage extends ShowcasePage {
         breadcrumbs.setAutoNavigationEnabled(false);
         breadcrumbs.setCrumbFactory(crumbFactory);
         breadcrumbs.setSelectedCrumb(
-                Breadcrumbs.buildTreeModel(getParentPath(model.currentPathProperty().get(), 5).toArray(Path[]::new))
+                Breadcrumbs.buildTreeModel(getParentPath(model.currentPathProperty().get(), 4).toArray(Path[]::new))
         );
         breadcrumbs.setMaxWidth(Region.USE_PREF_SIZE);
         breadcrumbs.setMaxHeight(Region.USE_PREF_SIZE);

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/RightClickMenu.java

@@ -0,0 +1,47 @@
+/* SPDX-License-Identifier: MIT */
+package atlantafx.sampler.page.showcase.filemanager;
+
+import javafx.scene.control.ContextMenu;
+import javafx.scene.control.MenuItem;
+import javafx.scene.control.SeparatorMenuItem;
+import javafx.scene.input.KeyCode;
+import javafx.scene.input.KeyCodeCombination;
+
+import static javafx.scene.input.KeyCombination.CONTROL_DOWN;
+
+public class RightClickMenu extends ContextMenu {
+
+    public RightClickMenu() {
+        super();
+        createMenu();
+    }
+
+    private void createMenu() {
+        var open = new MenuItem("Open");
+
+        var cut = new MenuItem("Cut");
+        cut.setAccelerator(new KeyCodeCombination(KeyCode.X, CONTROL_DOWN));
+
+        var copy = new MenuItem("Copy");
+        copy.setAccelerator(new KeyCodeCombination(KeyCode.C, CONTROL_DOWN));
+
+        var rename = new MenuItem("Rename");
+        rename.setAccelerator(new KeyCodeCombination(KeyCode.F2));
+
+        var compress = new MenuItem("Compress");
+
+        var properties = new MenuItem("Properties");
+
+        getItems().setAll(
+                open,
+                new SeparatorMenuItem(),
+                cut,
+                copy,
+                rename,
+                new SeparatorMenuItem(),
+                compress,
+                new SeparatorMenuItem(),
+                properties
+        );
+    }
+}

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/TableDirectoryView.java

@@ -1,7 +1,9 @@
 /* SPDX-License-Identifier: MIT */
 package atlantafx.sampler.page.showcase.filemanager;
 
+import atlantafx.base.theme.Styles;
 import atlantafx.sampler.util.Containers;
+import atlantafx.sampler.util.HumanReadableFormat;
 import javafx.beans.property.SimpleLongProperty;
 import javafx.beans.property.SimpleObjectProperty;
 import javafx.beans.property.SimpleStringProperty;
@@ -11,28 +13,29 @@ import javafx.scene.control.TableCell;
 import javafx.scene.control.TableColumn;
 import javafx.scene.control.TableRow;
 import javafx.scene.control.TableView;
+import javafx.scene.image.ImageView;
 import javafx.scene.layout.AnchorPane;
 import javafx.scene.layout.Pane;
-import org.kordamp.ikonli.javafx.FontIcon;
-import org.kordamp.ikonli.material2.Material2AL;
-import org.kordamp.ikonli.material2.Material2OutlinedAL;
 
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.attribute.FileTime;
 import java.time.ZoneId;
-import java.time.format.DateTimeFormatter;
 import java.util.Comparator;
 import java.util.function.Consumer;
 import java.util.stream.Stream;
 
 import static atlantafx.sampler.page.showcase.filemanager.Utils.*;
+import static atlantafx.sampler.util.HumanReadableFormat.byteCount;
+import static java.nio.file.LinkOption.NOFOLLOW_LINKS;
 import static javafx.scene.control.TableColumn.SortType.ASCENDING;
 
 final class TableDirectoryView extends AnchorPane implements DirectoryView {
 
     private static final PseudoClass HIDDEN = PseudoClass.getPseudoClass("hidden");
     private static final PseudoClass FOLDER = PseudoClass.getPseudoClass("folder");
+    private static final FileIconRepository REPO = new FileIconRepository();
+    private static final String UNKNOWN = "unknown";
 
     private final FileList fileList;
     private Consumer<Path> actionHandler;
@@ -42,7 +45,7 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
         fileList = new FileList(table);
 
         getChildren().setAll(table);
-        getStyleClass().add("table-directory-view");
+        getStyleClass().addAll("table-directory-view");
         Containers.setAnchors(table, Insets.EMPTY);
     }
 
@@ -61,12 +64,14 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
         sizeCol.setCellFactory(col -> new FileSizeCell());
 
         var mtimeCol = new TableColumn<Path, FileTime>("Modified");
-        mtimeCol.setCellValueFactory(param -> new SimpleObjectProperty<>(fileMTime(param.getValue())));
+        mtimeCol.setCellValueFactory(param -> new SimpleObjectProperty<>(fileMTime(param.getValue(), NOFOLLOW_LINKS)));
         mtimeCol.setCellFactory(col -> new FileTimeCell());
+        mtimeCol.setStyle("-fx-alignment: CENTER-RIGHT;");
 
         // ~
 
         var table = new TableView<Path>();
+        table.getStyleClass().add(Styles.STRIPED);
         table.getColumns().setAll(filenameCol, sizeCol, mtimeCol);
         table.getSortOrder().add(filenameCol);
         table.setSortPolicy(param -> true);
@@ -83,6 +88,7 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
 
             return row;
         });
+        table.setContextMenu(new RightClickMenu());
 
         return table;
     }
@@ -119,10 +125,12 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
 
     private static class FilenameCell extends TableCell<Path, String> {
 
-        private final FontIcon icon = new FontIcon();
+        private final ImageView imageView = new ImageView();
 
         public FilenameCell() {
             setGraphicTextGap(10);
+            imageView.setFitWidth(24);
+            imageView.setFitHeight(24);
         }
 
         @Override
@@ -132,11 +140,19 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
                 setGraphic(null);
                 setText(null);
             } else {
-                boolean isDirectory = Files.isDirectory(getTableRow().getItem());
-                icon.setIconCode(isDirectory ? Material2AL.FOLDER : Material2OutlinedAL.INSERT_DRIVE_FILE);
+                var isDirectory = Files.isDirectory(getTableRow().getItem());
+                var path = getTableRow().getItem();
+
+                if (!isDirectory) {
+                    imageView.setImage(REPO.getByMimeType(Utils.getMimeType(path)));
+                } else {
+                    imageView.setImage(FileIconRepository.FOLDER);
+                }
+
                 pseudoClassStateChanged(FOLDER, isDirectory);
-                getTableRow().pseudoClassStateChanged(HIDDEN, isFileHidden(getTableRow().getItem()));
-                setGraphic(icon);
+                getTableRow().pseudoClassStateChanged(HIDDEN, isFileHidden(path));
+
+                setGraphic(imageView);
                 setText(filename);
             }
         }
@@ -159,10 +175,10 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
                             throw new RuntimeException(e);
                         }
                     } else {
-                        setText("unknown");
+                        setText(UNKNOWN);
                     }
                 } else {
-                    setText(humanReadableByteCount(fileSize.longValue()));
+                    setText(byteCount(fileSize.longValue()));
                 }
             }
         }
@@ -176,9 +192,10 @@ final class TableDirectoryView extends AnchorPane implements DirectoryView {
             if (empty) {
                 setText(null);
             } else {
-                setText(DateTimeFormatter.ISO_DATE.format(
-                        fileTime.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime()
-                ));
+                setText(fileTime != null ?
+                                HumanReadableFormat.date(fileTime.toInstant().atZone(ZoneId.systemDefault()).toLocalDateTime()) :
+                                UNKNOWN
+                );
             }
         }
     }

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/Utils.java

@@ -4,6 +4,7 @@ package atlantafx.sampler.page.showcase.filemanager;
 import java.awt.*;
 import java.io.IOException;
 import java.nio.file.Files;
+import java.nio.file.LinkOption;
 import java.nio.file.Path;
 import java.nio.file.attribute.FileTime;
 import java.text.CharacterIterator;
@@ -29,24 +30,16 @@ final class Utils {
         }
     }
 
-    public static FileTime fileMTime(Path path) {
+    public static FileTime fileMTime(Path path, LinkOption... options) {
         if (path == null) { return null; }
         try {
-            return Files.getLastModifiedTime(path);
+            return Files.getLastModifiedTime(path, options);
         } catch (IOException e) {
             return null;
         }
     }
 
-    public static String humanReadableByteCount(long bytes) {
-        if (-1000 < bytes && bytes < 1000) { return bytes + " B"; }
-        CharacterIterator ci = new StringCharacterIterator("kMGTPE");
-        while (bytes <= -999_950 || bytes >= 999_950) {
-            bytes /= 1000;
-            ci.next();
-        }
-        return String.format("%.1f %cB", bytes / 1000.0, ci.current());
-    }
+
 
     public static void openFile(Path path) {
         if (Desktop.isDesktopSupported()) {
@@ -59,4 +52,12 @@ final class Utils {
             }).start();
         }
     }
+
+    public static String getMimeType(Path path) {
+        try {
+            return Files.probeContentType(path);
+        } catch (IOException e) {
+            return null;
+        }
+    }
 }

sampler/src/main/java/atlantafx/sampler/page/showcase/filemanager/file-manager.css

@@ -4,24 +4,22 @@
     -fx-border-width: 0 0 1 1;
 }
 .file-manager-showcase .table-directory-view .table-view {
+    -color-header-bg: -color-bg-default;
+    -color-cell-bg-selected: -color-accent-emphasis;
+    -color-cell-fg-selected: -color-fg-emphasis;
     -fx-border-width: 0 1 1 0;
 }
 
+.file-manager-showcase .tool-bar {
+    -fx-background-insets: 0, 1;
+}
+
 /* setting opacity directly to the .table-cell or .table-row-cell
    leads to incorrect table row height calculation #javafx-bug */
 .file-manager-showcase .table-row-cell:hidden >.table-cell > * {
     -fx-opacity: 0.6;
 }
 
-.file-manager-showcase .table-row-cell >.table-cell:folder .ikonli-font-icon {
-    -fx-icon-color: -color-accent-emphasis;
-    -fx-fill: -color-accent-emphasis;
-}
-
 .file-manager-showcase .bookmark-list .ikonli-font-icon {
     -fx-icon-size: 18px;
 }
-
-.file-manager-showcase .table-directory-view .ikonli-font-icon {
-    -fx-icon-size: 18px;
-}

sampler/src/main/java/atlantafx/sampler/util/HumanReadableFormat.java

@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: MIT */
+package atlantafx.sampler.util;
+
+import java.text.CharacterIterator;
+import java.text.StringCharacterIterator;
+import java.time.LocalDateTime;
+import java.time.format.DateTimeFormatter;
+import java.time.temporal.WeekFields;
+import java.util.Locale;
+import java.util.Objects;
+
+public final class HumanReadableFormat {
+
+    public static final DateTimeFormatter DAY_MONTH_YEAR = DateTimeFormatter.ofPattern("d LLL yyyy");
+    public static final DateTimeFormatter DAY_MONTH = DateTimeFormatter.ofPattern("d LLL");
+    public static final DateTimeFormatter DAY_OF_WEEK = DateTimeFormatter.ofPattern("EEE");
+    public static final DateTimeFormatter HOUR_MINUTE = DateTimeFormatter.ofPattern("HH:mm");
+
+    public static String byteCount(long bytes) {
+        if (-1000 < bytes && bytes < 1000) { return bytes + " B"; }
+        CharacterIterator ci = new StringCharacterIterator("kMGTPE");
+        while (bytes <= -999_950 || bytes >= 999_950) {
+            bytes /= 1000;
+            ci.next();
+        }
+        return String.format("%.1f %cB", bytes / 1000.0, ci.current());
+    }
+
+    public static String date(LocalDateTime x) {
+        Objects.requireNonNull(x);
+        var now = LocalDateTime.now();
+
+        // not this year
+        if (x.getYear() != now.getYear()) { return DAY_MONTH_YEAR.format(x); }
+
+        // not this week
+        if (getWeekNumber(x) != getWeekNumber(now)) { return DAY_MONTH.format(x); }
+
+        // not today
+        int xDay = x.getDayOfWeek().getValue();
+        int nowDay = now.getDayOfWeek().getValue();
+        if (xDay == nowDay - 1) { return "Yesterday"; }
+        if (xDay != nowDay) { return DAY_OF_WEEK.format(x); }
+
+        return HOUR_MINUTE.format(x);
+    }
+
+    private static int getWeekNumber(LocalDateTime date) {
+        return date.get(WeekFields.of(Locale.getDefault()).weekOfYear());
+    }
+}

sampler/src/main/resources/assets/styles/scss/general/_root.scss

@@ -29,6 +29,10 @@
         -fx-padding: 0;
         -fx-spacing: 0;
       }
+
+      .credits {
+        @include hide();
+      }
     }
   }
 }

sampler/src/main/resources/images/papirus/LICENSE.txt

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.