Add TTY check and debounce behavior; update README and tests

README.md

@@ -11,7 +11,7 @@ Privacy-friendly by design: no system notifications, no message content, no exte
 ```json
 {
   "$schema": "https://opencode.ai/config.json",
-  "plugin": ["opencode-bell@0.1.0"]
+  "plugin": ["opencode-bell@0.1.1"]
 }
 ```
 
@@ -32,6 +32,12 @@ The plugin triggers a terminal bell for these events:
 - `session.idle`
 - `session.error`
 
+Behavior details:
+
+- Rings only when `process.stdout.isTTY` is true.
+- Debounces repeated rings for the same key within 1200ms.
+- Uses per-session keys when `event.properties.sessionID` is present.
+
 ## Verify
 
 - Trigger a permission request (e.g., any tool that requires approval).

test/plugin.test.js

@@ -3,6 +3,47 @@ import assert from "node:assert/strict"
 
 import { OpencodeBellPlugin } from "../index.js"
 
+const withStdoutStub = async ({ isTTY = true }, run) => {
+  const originalWrite = process.stdout.write
+  const originalDescriptor = Object.getOwnPropertyDescriptor(process.stdout, "isTTY")
+  const writes = []
+
+  process.stdout.write = (chunk) => {
+    writes.push(chunk)
+    return true
+  }
+  Object.defineProperty(process.stdout, "isTTY", {
+    configurable: true,
+    value: isTTY
+  })
+
+  try {
+    await run(writes)
+  } finally {
+    process.stdout.write = originalWrite
+    if (originalDescriptor) {
+      Object.defineProperty(process.stdout, "isTTY", originalDescriptor)
+    }
+  }
+}
+
+const withMockedNow = async (times, run) => {
+  const originalNow = Date.now
+  let index = 0
+
+  Date.now = () => {
+    const value = times[index]
+    index += 1
+    return value
+  }
+
+  try {
+    await run()
+  } finally {
+    Date.now = originalNow
+  }
+}
+
 test("does not throw when event.properties is missing", async () => {
   const plugin = await OpencodeBellPlugin()
   await assert.doesNotReject(
@@ -11,3 +52,72 @@ test("does not throw when event.properties is missing", async () => {
     })
   )
 })
+
+test("rings once for each supported event type", async () => {
+  const plugin = await OpencodeBellPlugin()
+
+  await withStdoutStub({ isTTY: true }, async (writes) => {
+    await plugin.event({ event: { type: "permission.asked" } })
+    await plugin.event({ event: { type: "question.asked" } })
+    await plugin.event({ event: { type: "session.idle" } })
+    await plugin.event({ event: { type: "session.error" } })
+
+    assert.equal(writes.length, 4)
+    assert.deepEqual(writes, ["\x07", "\x07", "\x07", "\x07"])
+  })
+})
+
+test("does not ring for unsupported event types", async () => {
+  const plugin = await OpencodeBellPlugin()
+
+  await withStdoutStub({ isTTY: true }, async (writes) => {
+    await plugin.event({ event: { type: "session.started" } })
+    assert.equal(writes.length, 0)
+  })
+})
+
+test("does not ring when stdout is not a TTY", async () => {
+  const plugin = await OpencodeBellPlugin()
+
+  await withStdoutStub({ isTTY: false }, async (writes) => {
+    await plugin.event({ event: { type: "session.idle" } })
+    assert.equal(writes.length, 0)
+  })
+})
+
+test("debounces repeated events within 1200ms for the same key", async () => {
+  const plugin = await OpencodeBellPlugin()
+
+  await withStdoutStub({ isTTY: true }, async (writes) => {
+    await withMockedNow([2000, 2500, 3301], async () => {
+      await plugin.event({ event: { type: "permission.asked" } })
+      await plugin.event({ event: { type: "permission.asked" } })
+      await plugin.event({ event: { type: "permission.asked" } })
+    })
+
+    assert.equal(writes.length, 2)
+  })
+})
+
+test("uses session-specific debounce keys", async () => {
+  const plugin = await OpencodeBellPlugin()
+
+  await withStdoutStub({ isTTY: true }, async (writes) => {
+    await withMockedNow([2000, 2100], async () => {
+      await plugin.event({
+        event: {
+          type: "permission.asked",
+          properties: { sessionID: "A" }
+        }
+      })
+      await plugin.event({
+        event: {
+          type: "permission.asked",
+          properties: { sessionID: "B" }
+        }
+      })
+    })
+
+    assert.equal(writes.length, 2)
+  })
+})