From 648408622220d7c1fc4cda0963f6696059230e56 Mon Sep 17 00:00:00 2001
From: Dave Horton <daveh@beachdognet.com>
Date: Fri, 25 Nov 2022 08:15:18 -0500
Subject: [PATCH] feature: return transcript faster if we get an exact match to
 a provided hint on an interim transcript (requires env
 JAMBONZ_GATHER_EARLY_HINTS_MATCH=1)

---
 lib/tasks/gather.js | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/lib/tasks/gather.js b/lib/tasks/gather.js
index 61f9569f..bb7ce8a5 100644
--- a/lib/tasks/gather.js
+++ b/lib/tasks/gather.js
@@ -143,6 +143,14 @@ class TaskGather extends Task {
       this.logger.debug({hints: this.hints, hintsBoost: this.hintsBoost},
         'Gather:exec - applying global sttHints');
     }
+    if (process.env.JAMBONZ_GATHER_EARLY_HINTS_MATCH &&
+      !this.isContinuousAsr &&
+      this.hints.length > 0 && this.hints.length <= 10) {
+      this.earlyHintsMatch = true;
+      this.interim = true;
+      this.logger.debug('Gather:exec - early hints match enabled');
+    }
+
     if (cs.hasAltLanguages) {
       this.altLanguages = this.altLanguages.concat(cs.altLanguages);
       this.logger.debug({altLanguages: this.altLanguages},
@@ -526,6 +534,15 @@ class TaskGather extends Task {
       }
     }
 
+    if (this.earlyHintsMatch && evt.is_final === false) {
+      const transcript = evt.alternatives[0].transcript?.toLowerCase();
+      if (this.hints.find((h) => h.toLowerCase() === transcript)) {
+        this.logger.debug({evt}, 'Gather:_onTranscription: early hint match');
+        this._resolve('speech', evt);
+        return;
+      }
+    }
+
     /* count words for bargein feature */
     const words = evt.alternatives[0].transcript.split(' ').length;
     const bufferedWords = this._bufferedTranscripts.reduce((count, e) => {