Added a module to coalesce adjacent same-speaker segments

internal/overlap/detect.go

@@ -2,6 +2,7 @@ package overlap
 
 import (
 	"fmt"
+	"sort"
 
 	"gitea.maximumdirect.net/eric/seriatim/internal/model"
 )
@@ -18,9 +19,10 @@ func Detect(in model.MergedTranscript) model.MergedTranscript {
 		return in
 	}
 
+	order := sortedSegmentIndices(in.Segments)
 	var groupID int
 	var candidate overlapCandidate
-	for index := range in.Segments {
+	for _, index := range order {
 		segment := in.Segments[index]
 		if !candidate.active {
 			candidate = newCandidate(index, segment)
@@ -40,6 +42,17 @@ func Detect(in model.MergedTranscript) model.MergedTranscript {
 	return in
 }
 
+func sortedSegmentIndices(segments []model.Segment) []int {
+	indices := make([]int, len(segments))
+	for index := range segments {
+		indices[index] = index
+	}
+	sort.SliceStable(indices, func(i, j int) bool {
+		return model.SegmentLess(segments[indices[i]], segments[indices[j]])
+	})
+	return indices
+}
+
 type overlapCandidate struct {
 	active  bool
 	indices []int