chore: add a badge to the plugin update button

src/main/kotlin/app/termora/BadgeGlassPaneExtension.kt

@@ -0,0 +1,18 @@
+package app.termora
+
+import java.awt.Graphics2D
+import javax.swing.JComponent
+
+class BadgeGlassPaneExtension private constructor() : GlassPaneExtension {
+    companion object {
+        val instance = BadgeGlassPaneExtension()
+    }
+
+    override fun paint(c: JComponent, g2d: Graphics2D): Boolean {
+        return false
+    }
+
+    override fun ordered(): Long {
+        return 0
+    }
+}

src/main/kotlin/app/termora/TermoraFrame.kt

@@ -276,9 +276,10 @@ class TermoraFrame : JFrame(), DataProvider {
                 .getExtensions(GlassPaneExtension::class.java)
             if (extensions.isNotEmpty()) {
                 for (extension in extensions) {
-                    if (extension.paint(this, g2d)) {
-                        return
-                    }
+                    g2d.save()
+                    val painted = extension.paint(this, g2d)
+                    g2d.restore()
+                    if (painted) break
                 }
             }
         }

src/main/kotlin/app/termora/plugin/PluginManager.kt

@@ -3,6 +3,7 @@ package app.termora.plugin
 import app.termora.Application
 import app.termora.ApplicationScope
 import app.termora.account.AccountPlugin
+import app.termora.plugin.internal.badge.BadgePlugin
 import app.termora.plugin.internal.extension.DynamicExtensionPlugin
 import app.termora.plugin.internal.local.LocalInternalPlugin
 import app.termora.plugin.internal.plugin.PluginInternalPlugin
@@ -103,6 +104,8 @@ internal class PluginManager private constructor() {
         plugins.add(PluginDescriptor(PluginInternalPlugin(), origin = PluginOrigin.Internal, version = version))
         // account plugin
         plugins.add(PluginDescriptor(AccountPlugin(), origin = PluginOrigin.Internal, version = version))
+        // badge plugin
+        plugins.add(PluginDescriptor(BadgePlugin(), origin = PluginOrigin.Internal, version = version))
 
         // ssh plugin
         plugins.add(PluginDescriptor(SSHInternalPlugin(), origin = PluginOrigin.Internal, version = version))

src/main/kotlin/app/termora/plugin/internal/badge/BadgePlugin.kt

@@ -0,0 +1,22 @@
+package app.termora.plugin.internal.badge
+
+import app.termora.BadgeGlassPaneExtension
+import app.termora.GlassPaneExtension
+import app.termora.plugin.Extension
+import app.termora.plugin.InternalPlugin
+
+internal class BadgePlugin : InternalPlugin() {
+
+    init {
+        support.addExtension(GlassPaneExtension::class.java) { BadgeGlassPaneExtension.instance }
+    }
+
+    override fun getName(): String {
+        return "Badge"
+    }
+
+
+    override fun <T : Extension> getExtensions(clazz: Class<T>): List<T> {
+        return support.getExtensions(clazz)
+    }
+}

src/main/kotlin/app/termora/plugin/internal/plugin/InstallButton.kt

@@ -1,11 +1,14 @@
 package app.termora.plugin.internal.plugin
 
 import app.termora.DynamicColor
+import app.termora.setupAntialiasing
 import com.formdev.flatlaf.extras.components.FlatButton
 import com.formdev.flatlaf.ui.FlatButtonUI
 import java.awt.Color
 import java.awt.Graphics
+import java.awt.Graphics2D
 import javax.swing.JComponent
+import javax.swing.UIManager
 import kotlin.math.round
 
 open class InstallButton : FlatButton() {
@@ -15,6 +18,7 @@ open class InstallButton : FlatButton() {
             field = value
             repaint()
         }
+    var update = false
 
     private var paintingBackground = false
 
@@ -44,6 +48,18 @@ open class InstallButton : FlatButton() {
         return super.getText()
     }
 
+    override fun paint(g: Graphics?) {
+        super.paint(g)
+        if (g is Graphics2D) {
+            setupAntialiasing(g)
+            if (update && installing.not()) {
+                val size = 6
+                g.color = UIManager.getColor("Component.error.focusedBorderColor")
+                g.fillRoundRect(width - size - 4, 4, size, size, size, size)
+            }
+        }
+    }
+
 
     private inner class InstallButtonUI : FlatButtonUI(true) {
         override fun paintBackground(g: Graphics?, c: JComponent?) {

src/main/kotlin/app/termora/plugin/internal/plugin/PluginPanel.kt

@@ -38,7 +38,7 @@ class PluginPanel(val descriptor: PluginPluginDescriptor) : JPanel(), Disposable
     }
 
     private val restartButton = JButton(I18n.getString("termora.settings.restart.title"))
-    private val updateButton = InstallButton()
+    private val updateButton = InstallButton().apply { update = true }
     private val installButton = InstallButton()
     private val uninstallButton = JButton(I18n.getString("termora.settings.plugin.uninstall"))