pretty good

.gitignore

@@ -10,3 +10,4 @@ devenv.local.yaml
 
 # pre-commit
 .pre-commit-config.yaml
+build

README.md

@@ -34,6 +34,8 @@ If `XDG_CONFIG_HOME` is unset, the fallback is:
 $HOME/.config/jprototerm/config.toml
 ```
 
+If no config file exists, jprototerm writes the default config on startup.
+
 Example, also available in `config.example.toml`:
 
 ```toml
@@ -60,6 +62,7 @@ toggle_floating = "ALT+F"
 new_floating = "ALT+SHIFT+F"
 next_floating = "ALT+F12"
 close_pane = "ALT+X"
+open_font_selector = "ALT+T"
 ```
 
 ## Defaults
@@ -69,5 +72,6 @@ close_pane = "ALT+X"
 - `Alt+Shift+f`: create a new floating pane
 - `Alt+F12`: cycle floating panes
 - `Alt+x`: close the active floating pane
+- `Alt+t`: open the font selector
 - Font default: `JetBrainsMono Nerd Font`
 - Kitty graphics protocol parsing is enabled by default

config.example.toml

@@ -21,3 +21,4 @@ toggle_floating = "ALT+F"
 new_floating = "ALT+SHIFT+F"
 next_floating = "ALT+F12"
 close_pane = "ALT+X"
+open_font_selector = "ALT+T"

devenv.nix

@@ -7,6 +7,7 @@ let
     "git+https://gitea.gregorlohaus.com/gregor/jlibghostty.git";
 
   jlib = jlibghostty.packages.${system}.jlibghostty;
+  hostNvidiaLibs = ".devenv/host-nvidia-libs";
 in
 {
   packages = [
@@ -26,9 +27,10 @@ in
     pkgs.libGL
     pkgs.gtk3
     pkgs.alsa-lib
+    pkgs.mesa-demos
   ];
 
-  env.LD_LIBRARY_PATH = lib.makeLibraryPath [
+  env.LD_LIBRARY_PATH = "${hostNvidiaLibs}:" + lib.makeLibraryPath [
     pkgs.openjfx
 
     pkgs.glib
@@ -42,5 +44,23 @@ in
     pkgs.gtk3
     pkgs.alsa-lib
   ] + ":/usr/lib/x86_64-linux-gnu/nvidia/current";
+  env.__GLX_VENDOR_LIBRARY_NAME = "nvidia";
+  env.__EGL_VENDOR_LIBRARY_FILENAMES = "/usr/share/glvnd/egl_vendor.d/10_nvidia.json";
   env.JLIBGHOSTTY_MAVEN_REPO = "${jlib}/maven";
+
+  enterShell = ''
+    mkdir -p ${hostNvidiaLibs}
+    for lib in \
+      /usr/lib/x86_64-linux-gnu/libnvidia*.so* \
+      /usr/lib/x86_64-linux-gnu/libGLX_nvidia.so* \
+      /usr/lib/x86_64-linux-gnu/libEGL_nvidia.so* \
+      /usr/lib/x86_64-linux-gnu/nvidia/current/libnvidia*.so* \
+      /usr/lib/x86_64-linux-gnu/nvidia/current/libGLX_nvidia.so* \
+      /usr/lib/x86_64-linux-gnu/nvidia/current/libEGL_nvidia.so*
+    do
+      if [ -e "$lib" ]; then
+        ln -sfn "$lib" ${hostNvidiaLibs}/"$(basename "$lib")"
+      fi
+    done
+  '';
 }

src/main/java/com/gregor/jprototerm/AppConfig.java

@@ -8,7 +8,11 @@ import io.github.wasabithumb.jtoml.value.primitive.TomlPrimitive;
 import io.github.wasabithumb.jtoml.value.table.TomlTable;
 
 import java.nio.file.Files;
+import java.io.IOException;
 import java.nio.file.Path;
+import java.nio.file.StandardOpenOption;
+import java.util.LinkedHashMap;
+import java.util.List;
 import java.util.Map;
 
 public record AppConfig(
@@ -22,10 +26,23 @@ public record AppConfig(
         boolean kittyGraphics,
         Map<String, KeyBinding> keybindings
 ) {
+    private static final List<String> KEYBINDING_KEYS = List.of(
+            "navigate_left",
+            "navigate_down",
+            "navigate_up",
+            "navigate_right",
+            "toggle_floating",
+            "new_floating",
+            "next_floating",
+            "close_pane",
+            "open_font_selector"
+    );
+
     public static AppConfig load() {
         AppConfig defaults = defaults();
         Path path = configPath();
         if (!Files.isRegularFile(path)) {
+            writeDefaultConfig(path, defaults);
             return defaults;
         }
 
@@ -40,16 +57,7 @@ public record AppConfig(
                     doubleValue(document, "window.width", defaults.windowWidth),
                     doubleValue(document, "window.height", defaults.windowHeight),
                     booleanValue(document, "kitty_graphics.enabled", defaults.kittyGraphics),
-                    Map.of(
-                            "navigate_left", binding(document, "keybindings.navigate_left", defaults.keybindings.get("navigate_left")),
-                            "navigate_down", binding(document, "keybindings.navigate_down", defaults.keybindings.get("navigate_down")),
-                            "navigate_up", binding(document, "keybindings.navigate_up", defaults.keybindings.get("navigate_up")),
-                            "navigate_right", binding(document, "keybindings.navigate_right", defaults.keybindings.get("navigate_right")),
-                            "toggle_floating", binding(document, "keybindings.toggle_floating", defaults.keybindings.get("toggle_floating")),
-                            "new_floating", binding(document, "keybindings.new_floating", defaults.keybindings.get("new_floating")),
-                            "next_floating", binding(document, "keybindings.next_floating", defaults.keybindings.get("next_floating")),
-                            "close_pane", binding(document, "keybindings.close_pane", defaults.keybindings.get("close_pane"))
-                    )
+                    keybindings(document, defaults)
             );
         } catch (TomlException ex) {
             System.err.println("Could not parse " + path + ": " + ex.getMessage());
@@ -75,11 +83,30 @@ public record AppConfig(
                         "toggle_floating", KeyBinding.parse("ALT+F"),
                         "new_floating", KeyBinding.parse("ALT+SHIFT+F"),
                         "next_floating", KeyBinding.parse("ALT+F12"),
-                        "close_pane", KeyBinding.parse("ALT+X")
+                        "close_pane", KeyBinding.parse("ALT+X"),
+                        "open_font_selector", KeyBinding.parse("ALT+T")
                 )
         );
     }
 
+    public AppConfig withFont(String family, double size) {
+        return new AppConfig(
+                columns,
+                rows,
+                shell,
+                family,
+                size,
+                windowWidth,
+                windowHeight,
+                kittyGraphics,
+                keybindings
+        );
+    }
+
+    public void save() {
+        save(configPath(), this);
+    }
+
     public static Path configPath() {
         String configHome = System.getenv("XDG_CONFIG_HOME");
         if (configHome != null && !configHome.isBlank()) {
@@ -92,6 +119,76 @@ public record AppConfig(
         return "/bin/bash";
     }
 
+    private static Map<String, KeyBinding> keybindings(TomlTable table, AppConfig defaults) {
+        Map<String, KeyBinding> parsed = new LinkedHashMap<>();
+        for (String key : KEYBINDING_KEYS) {
+            parsed.put(key, binding(table, "keybindings." + key, defaults.keybindings.get(key)));
+        }
+        return Map.copyOf(parsed);
+    }
+
+    private static void writeDefaultConfig(Path path, AppConfig defaults) {
+        save(path, defaults);
+    }
+
+    private static void save(Path path, AppConfig config) {
+        try {
+            Path parent = path.getParent();
+            if (parent != null) {
+                Files.createDirectories(parent);
+            }
+            Files.writeString(
+                    path,
+                    config.toToml(),
+                    StandardOpenOption.CREATE,
+                    StandardOpenOption.TRUNCATE_EXISTING,
+                    StandardOpenOption.WRITE
+            );
+        } catch (IOException ex) {
+            System.err.println("Could not write " + path + ": " + ex.getMessage());
+        }
+    }
+
+    private String toToml() {
+        StringBuilder builder = new StringBuilder();
+        builder.append("[terminal]\n");
+        builder.append("columns = ").append(columns).append('\n');
+        builder.append("rows = ").append(rows).append('\n');
+        builder.append("shell = ").append(quoted(shell)).append('\n');
+        builder.append("font_family = ").append(quoted(fontFamily)).append('\n');
+        builder.append("font_size = ").append(trimDouble(fontSize)).append("\n\n");
+        builder.append("[window]\n");
+        builder.append("width = ").append(trimDouble(windowWidth)).append('\n');
+        builder.append("height = ").append(trimDouble(windowHeight)).append("\n\n");
+        builder.append("[kitty_graphics]\n");
+        builder.append("enabled = ").append(kittyGraphics).append("\n\n");
+        builder.append("[keybindings]\n");
+        for (String key : KEYBINDING_KEYS) {
+            KeyBinding binding = keybindings.get(key);
+            if (binding != null) {
+                builder.append(key).append(" = ").append(quoted(binding.toString())).append('\n');
+            }
+        }
+        return builder.toString();
+    }
+
+    private static String quoted(String value) {
+        return "\"" + value
+                .replace("\\", "\\\\")
+                .replace("\"", "\\\"")
+                .replace("\n", "\\n")
+                .replace("\r", "\\r")
+                .replace("\t", "\\t")
+                + "\"";
+    }
+
+    private static String trimDouble(double value) {
+        if (value == Math.rint(value)) {
+            return Long.toString((long) value);
+        }
+        return Double.toString(value);
+    }
+
     private static KeyBinding binding(TomlTable table, String key, KeyBinding fallback) {
         String value = stringValue(table, key, null);
         if (value == null) {

src/main/java/com/gregor/jprototerm/KeyBinding.java

@@ -35,6 +35,22 @@ public record KeyBinding(boolean alt, boolean control, boolean shift, KeyCode co
                 && event.getCode() == code;
     }
 
+    @Override
+    public String toString() {
+        StringBuilder builder = new StringBuilder();
+        if (control) {
+            builder.append("CTRL+");
+        }
+        if (alt) {
+            builder.append("ALT+");
+        }
+        if (shift) {
+            builder.append("SHIFT+");
+        }
+        builder.append(code.getName().toUpperCase(Locale.ROOT).replace(' ', '_'));
+        return builder.toString();
+    }
+
     private static KeyCode keyCode(String token) {
         KeyCode alias = switch (token) {
             case "GRAVE", "BACKTICK", "BACK_QUOTE", "`" -> KeyCode.BACK_QUOTE;

src/main/java/com/gregor/jprototerm/Main.java

@@ -3,19 +3,29 @@ package com.gregor.jprototerm;
 import javafx.animation.AnimationTimer;
 import javafx.application.Application;
 import javafx.scene.Scene;
+import javafx.scene.control.ButtonType;
+import javafx.scene.control.ComboBox;
+import javafx.scene.control.Dialog;
+import javafx.scene.control.Label;
+import javafx.scene.control.Spinner;
+import javafx.scene.control.SpinnerValueFactory;
 import javafx.scene.input.KeyEvent;
+import javafx.scene.layout.GridPane;
 import javafx.scene.layout.StackPane;
+import javafx.scene.text.Font;
 import javafx.stage.Stage;
 
 public final class Main extends Application {
     private TerminalWorkspace workspace;
+    private TerminalCanvasView terminalView;
+    private AppConfig config;
 
     @Override
     public void start(Stage stage) {
-        AppConfig config = AppConfig.load();
+        config = AppConfig.load();
 
         workspace = new TerminalWorkspace(config);
-        TerminalCanvasView terminalView = new TerminalCanvasView(workspace, config);
+        terminalView = new TerminalCanvasView(workspace, config);
 
         StackPane root = new StackPane(terminalView.canvas());
         terminalView.canvas().widthProperty().bind(root.widthProperty());
@@ -23,7 +33,7 @@ public final class Main extends Application {
         terminalView.canvas().setOnMousePressed(event -> terminalView.canvas().requestFocus());
 
         Scene scene = new Scene(root, config.windowWidth(), config.windowHeight());
-        scene.addEventFilter(KeyEvent.KEY_PRESSED, event -> handlePressed(config, event));
+        scene.addEventFilter(KeyEvent.KEY_PRESSED, this::handlePressed);
         scene.addEventFilter(KeyEvent.KEY_TYPED, event -> handleTyped(event));
 
         new AnimationTimer() {
@@ -42,7 +52,7 @@ public final class Main extends Application {
         terminalView.canvas().requestFocus();
     }
 
-    private void handlePressed(AppConfig config, KeyEvent event) {
+    private void handlePressed(KeyEvent event) {
         if (config.keybindings().get("navigate_left").matches(event)) {
             workspace.navigate(Direction.LEFT);
             event.consume();
@@ -67,6 +77,9 @@ public final class Main extends Application {
         } else if (config.keybindings().get("close_pane").matches(event)) {
             workspace.closeActivePane();
             event.consume();
+        } else if (config.keybindings().get("open_font_selector").matches(event)) {
+            openFontSelector();
+            event.consume();
         } else {
             String encoded = KeyEncoder.encode(event);
             if (encoded != null) {
@@ -88,6 +101,49 @@ public final class Main extends Application {
         }
     }
 
+    private void openFontSelector() {
+        Dialog<ButtonType> dialog = new Dialog<>();
+        dialog.setTitle("Font");
+        dialog.getDialogPane().getButtonTypes().addAll(ButtonType.OK, ButtonType.CANCEL);
+
+        ComboBox<String> family = new ComboBox<>();
+        family.getItems().setAll(Font.getFamilies());
+        family.setEditable(true);
+        family.setMaxWidth(Double.MAX_VALUE);
+        family.setValue(config.fontFamily());
+
+        Spinner<Double> size = new Spinner<>();
+        size.setEditable(true);
+        size.setValueFactory(new SpinnerValueFactory.DoubleSpinnerValueFactory(6.0, 48.0, config.fontSize(), 0.5));
+
+        GridPane content = new GridPane();
+        content.setHgap(10.0);
+        content.setVgap(10.0);
+        content.add(new Label("Family"), 0, 0);
+        content.add(family, 1, 0);
+        content.add(new Label("Size"), 0, 1);
+        content.add(size, 1, 1);
+        dialog.getDialogPane().setContent(content);
+
+        dialog.showAndWait()
+                .filter(button -> button == ButtonType.OK)
+                .ifPresent(ignored -> {
+                    String selectedFamily = family.getEditor().getText();
+                    if (selectedFamily == null || selectedFamily.isBlank()) {
+                        selectedFamily = family.getValue();
+                    }
+                    if (selectedFamily == null || selectedFamily.isBlank()) {
+                        return;
+                    }
+
+                    double selectedSize = size.getValue();
+                    config = config.withFont(selectedFamily.trim(), selectedSize);
+                    config.save();
+                    terminalView.setFont(config.fontFamily(), config.fontSize());
+                    terminalView.canvas().requestFocus();
+                });
+    }
+
     public static void main(String[] args) {
         System.setProperty("prism.order", System.getProperty("prism.order", "es2,sw"));
         launch(Main.class, args);

src/main/java/com/gregor/jprototerm/ShellSession.java

@@ -19,7 +19,7 @@ public final class ShellSession implements AutoCloseable {
     private final ExecutorService reader;
     private volatile boolean closed;
 
-    private ShellSession(PtyProcess process, TerminalPane pane) {
+    private ShellSession(PtyProcess process) {
         this.process = process;
         this.stdin = process.getOutputStream();
         this.reader = Executors.newSingleThreadExecutor(runnable -> {
@@ -27,7 +27,6 @@ public final class ShellSession implements AutoCloseable {
             thread.setDaemon(true);
             return thread;
         });
-        reader.submit(() -> readOutput(pane));
     }
 
     public static ShellSession start(String shell, TerminalPane pane, int columns, int rows) {
@@ -42,13 +41,17 @@ public final class ShellSession implements AutoCloseable {
                     .setInitialRows(rows)
                     .setDirectory(System.getProperty("user.home"))
                     .start();
-            return new ShellSession(process, pane);
+            return new ShellSession(process);
         } catch (IOException ex) {
             pane.write("failed to start shell: " + ex.getMessage() + "\r\n");
             throw new IllegalStateException("Could not start shell " + shell, ex);
         }
     }
 
+    public void startReading(TerminalPane pane) {
+        reader.submit(() -> readOutput(pane));
+    }
+
     public void resize(int columns, int rows) {
         if (closed) {
             return;
@@ -57,11 +60,15 @@ public final class ShellSession implements AutoCloseable {
     }
 
     public void send(String text) {
+        send(text.getBytes(StandardCharsets.UTF_8));
+    }
+
+    public void send(byte[] bytes) {
         if (closed) {
             return;
         }
         try {
-            stdin.write(text.getBytes(StandardCharsets.UTF_8));
+            stdin.write(bytes);
             stdin.flush();
         } catch (IOException ex) {
             close();

src/main/java/com/gregor/jprototerm/TerminalCanvasView.java

@@ -32,10 +32,14 @@ public final class TerminalCanvasView {
     private final TerminalWorkspace workspace;
     private final AppConfig config;
     private final Map<Long, Image> kittyImageCache = new HashMap<>();
+    private String fontFamily;
+    private double fontSize;
 
     public TerminalCanvasView(TerminalWorkspace workspace, AppConfig config) {
         this.workspace = workspace;
         this.config = config;
+        this.fontFamily = config.fontFamily();
+        this.fontSize = config.fontSize();
         canvas.setFocusTraversable(true);
     }
 
@@ -43,6 +47,11 @@ public final class TerminalCanvasView {
         return canvas;
     }
 
+    public void setFont(String family, double size) {
+        this.fontFamily = family;
+        this.fontSize = size;
+    }
+
     public void render() {
         double width = canvas.getWidth();
         double height = canvas.getHeight();
@@ -75,7 +84,7 @@ public final class TerminalCanvasView {
         gc.setLineWidth(workspace.isActive(pane) ? 2.0 : 1.0);
         gc.strokeRect(pane.x() + 0.5, pane.y() + 0.5, pane.width() - 1.0, pane.height() - 1.0);
 
-        Font font = Font.font(config.fontFamily(), config.fontSize());
+        Font font = Font.font(fontFamily, fontSize);
         gc.setFont(font);
 
         FontMetrics metrics = measureFontMetrics(font);
@@ -105,15 +114,14 @@ public final class TerminalCanvasView {
     }
 
     private static FontMetrics measureFontMetrics(Font font) {
-        Text text = new Text("Mg");
+        Text text = new Text("┃MgÅjy");
         text.setFont(font);
-        double textHeight = text.getLayoutBounds().getHeight();
-        double lineHeight = Math.max(1.0, Math.ceil(textHeight * 1.2));
-        double baselineOffset = -text.getLayoutBounds().getMinY() + ((lineHeight - textHeight) / 2.0);
+        double lineHeight = Math.max(1.0, text.getLayoutBounds().getHeight());
+        double baselineOffset = -text.getLayoutBounds().getMinY();
 
         Text cell = new Text("M");
         cell.setFont(font);
-        double cellWidth = Math.max(1.0, Math.ceil(cell.getLayoutBounds().getWidth()));
+        double cellWidth = Math.max(1.0, cell.getLayoutBounds().getWidth());
         return new FontMetrics(cellWidth, lineHeight, baselineOffset);
     }
 

src/main/java/com/gregor/jprototerm/TerminalPane.java

@@ -5,6 +5,7 @@ import dev.jlibghostty.KittyGraphics;
 import dev.jlibghostty.RenderStateSnapshot;
 import dev.jlibghostty.Terminal;
 import dev.jlibghostty.TerminalOptions;
+import dev.jlibghostty.DeviceAttributes;
 
 import java.util.Optional;
 import java.util.concurrent.atomic.AtomicReference;
@@ -32,6 +33,7 @@ public final class TerminalPane implements AutoCloseable {
 
     public static TerminalPane create(int columns, int rows) {
         Terminal terminal = Ghostty.open(TerminalOptions.of(columns, rows));
+        terminal.setDeviceAttributesProvider(DeviceAttributes::xtermCompatible);
         TerminalPane pane = new TerminalPane(terminal, columns, rows);
         pane.refresh();
         return pane;
@@ -53,6 +55,13 @@ public final class TerminalPane implements AutoCloseable {
 
     public void attach(ShellSession session) {
         this.session = session;
+        terminal.setPtyWriter(bytes -> {
+            ShellSession current = this.session;
+            if (current != null) {
+                current.send(bytes);
+            }
+        });
+        session.startReading(this);
     }
 
     public void send(String text) {