expose diarization support checking function

src/audio.ts

@@ -33,7 +33,7 @@ export class Audio {
 		return lines.join('\n');
 	}
 
-	private async isPyannoteInstalled(): Promise<boolean> {
+	async canDiarization(): Promise<boolean> {
 		return new Promise((resolve) => {
 			const proc = spawn('python3', ['-c', 'import pyannote.audio']);
 			proc.on('close', (code: number) => resolve(code === 0));
@@ -42,7 +42,7 @@ export class Audio {
 	}
 
 	private async runDiarization(audioPath: string): Promise<any[]> {
-		if(!await this.isPyannoteInstalled()) throw new Error('Pyannote is not installed: pip install pyannote.audio');
+		if(!await this.canDiarization()) throw new Error('Pyannote is not installed: pip install pyannote.audio');
 		const script = `
 import sys
 import json