Initial commit: OpenCode mobile app (extracted from opencode monorepo)

src/lib/speech.ts

@@ -0,0 +1,80 @@
+import { useState, useCallback, useRef } from "react"
+import { ExpoSpeechRecognitionModule, useSpeechRecognitionEvent } from "expo-speech-recognition"
+
+interface SpeechState {
+  listening: boolean
+  transcript: string
+  error: string | null
+}
+
+interface SpeechActions {
+  start: () => Promise<void>
+  stop: () => void
+  cancel: () => void
+}
+
+export function useSpeech(onResult: (text: string) => void): SpeechState & SpeechActions {
+  const [listening, setListening] = useState(false)
+  const [transcript, setTranscript] = useState("")
+  const [error, setError] = useState<string | null>(null)
+  const pending = useRef("")
+
+  useSpeechRecognitionEvent("start", () => {
+    setListening(true)
+    setError(null)
+    setTranscript("")
+    pending.current = ""
+  })
+
+  useSpeechRecognitionEvent("end", () => {
+    setListening(false)
+    // Deliver final transcript
+    if (pending.current.trim()) {
+      onResult(pending.current.trim())
+    }
+    setTranscript("")
+    pending.current = ""
+  })
+
+  useSpeechRecognitionEvent("result", (event) => {
+    const text = event.results[0]?.transcript || ""
+    pending.current = text
+    setTranscript(text)
+  })
+
+  useSpeechRecognitionEvent("error", (event) => {
+    // "no-speech" is not really an error — user just didn't say anything
+    if (event.error === "no-speech") {
+      setListening(false)
+      return
+    }
+    setError(event.message || event.error)
+    setListening(false)
+  })
+
+  const start = useCallback(async () => {
+    const result = await ExpoSpeechRecognitionModule.requestPermissionsAsync()
+    if (!result.granted) {
+      setError("Microphone permission denied")
+      return
+    }
+    ExpoSpeechRecognitionModule.start({
+      lang: "en-US",
+      interimResults: true,
+      continuous: true,
+    })
+  }, [])
+
+  const stop = useCallback(() => {
+    ExpoSpeechRecognitionModule.stop()
+  }, [])
+
+  const cancel = useCallback(() => {
+    pending.current = ""
+    ExpoSpeechRecognitionModule.abort()
+    setListening(false)
+    setTranscript("")
+  }, [])
+
+  return { listening, transcript, error, start, stop, cancel }
+}