feat(clipboard): add plugin (#323)

plugins/clipboard/android/src/androidTest/java/ExampleInstrumentedTest.kt

@@ -0,0 +1,24 @@
+package app.tauri.clipboard
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("app.tauri.clipboard", appContext.packageName)
+    }
+}

plugins/clipboard/android/src/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+</manifest>

plugins/clipboard/android/src/main/java/ClipboardPlugin.kt

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+package app.tauri.clipboard
+
+import android.R.attr.value
+import android.app.Activity
+import android.content.ClipData
+import android.content.ClipDescription
+import android.content.ClipboardManager
+import android.content.Context
+import app.tauri.annotation.Command
+import app.tauri.annotation.TauriPlugin
+import app.tauri.plugin.Invoke
+import app.tauri.plugin.JSObject
+import app.tauri.plugin.Plugin
+
+
+@TauriPlugin
+class ClipboardPlugin(private val activity: Activity) : Plugin(activity) {
+  private val manager: ClipboardManager =
+    activity.getSystemService(Context.CLIPBOARD_SERVICE) as ClipboardManager
+
+  @Command
+  @Suppress("MoveVariableDeclarationIntoWhen")
+  fun write(invoke: Invoke) {
+    val options = invoke.getObject("options")
+    if (options == null) {
+      invoke.reject("Missing `options` input")
+      return
+    }
+    val kind = invoke.getString("kind", "")
+
+    val clipData = when (kind) {
+      "PlainText" -> {
+        val label = options.getString("label", "")
+        val text = options.getString("text", "")
+        ClipData.newPlainText(label, text)
+      }
+
+      else -> {
+        invoke.reject("Unknown kind $kind")
+        return
+      }
+    }
+
+    manager.setPrimaryClip(clipData)
+
+    invoke.resolve()
+  }
+
+  @Command
+  fun read(invoke: Invoke) {
+    val (kind, options) = if (manager.hasPrimaryClip()) {
+      if (manager.primaryClipDescription?.hasMimeType(ClipDescription.MIMETYPE_TEXT_PLAIN) == true) {
+        val item: ClipData.Item = manager.primaryClip!!.getItemAt(0)
+        Pair("PlainText", item.text)
+      } else {
+        // TODO
+        invoke.reject("Clipboard content reader not implemented")
+        return
+      }
+    } else {
+      invoke.reject("Clipboard is empty")
+        return
+    }
+
+    val response = JSObject()
+    response.put("kind", kind)
+    response.put("options", options)
+    invoke.resolve(response)
+  }
+}

plugins/clipboard/android/src/test/java/ExampleUnitTest.kt

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+package app.tauri.clipboard
+
+import org.junit.Test
+
+import org.junit.Assert.*
+
+/**
+ * Example local unit test, which will execute on the development machine (host).
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+class ExampleUnitTest {
+    @Test
+    fun addition_isCorrect() {
+        assertEquals(4, 2 + 2)
+    }
+}