From c15b142b18dcdc7f5ab6d5f1afca8ae1696692cc Mon Sep 17 00:00:00 2001
From: Alan Pearce
Date: Tue, 7 May 2024 17:33:06 +0200
Subject: feat: search one set of options

---
 internal/search/search.go | 123 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 internal/search/search.go

(limited to 'internal/search/search.go')

diff --git a/internal/search/search.go b/internal/search/search.go
new file mode 100644
index 0000000..fc53ad0
--- /dev/null
+++ b/internal/search/search.go
@@ -0,0 +1,123 @@
+package search
+
+import (
+	"context"
+	"log"
+	"os"
+	"path"
+	"sync"
+
+	"searchix/internal/options"
+
+	"github.com/bcicen/jstream"
+	"github.com/blevesearch/bleve/v2"
+	"github.com/mitchellh/mapstructure"
+	"github.com/pkg/errors"
+)
+
+const maxResults = 10
+
+var index bleve.Index
+var docs sync.Map
+
+type Result[T options.NixOption] struct {
+	*bleve.SearchResult
+	Results []T
+}
+
+func Index() error {
+	bleve.SetLog(log.Default())
+	textFieldMapping := bleve.NewTextFieldMapping()
+	nameMapping := bleve.NewTextFieldMapping()
+	// something special for tokenisation?
+	// nameMapping.
+	optionMapping := bleve.NewDocumentStaticMapping()
+
+	optionMapping.AddFieldMappingsAt("Option", nameMapping)
+	optionMapping.AddFieldMappingsAt("RelatedPackages", textFieldMapping)
+	optionMapping.AddFieldMappingsAt("Description", textFieldMapping)
+
+	indexMapping := bleve.NewIndexMapping()
+	indexMapping.AddDocumentMapping("option", optionMapping)
+
+	var err error
+	index, err = bleve.NewMemOnly(indexMapping)
+	// index, err = bleve.New(path.Join(cfg.DataPath, const indexFilename = "index.bleve"), indexMapping)
+
+	if err != nil {
+		return errors.WithMessage(err, "error opening index")
+	}
+	batch := index.NewBatch()
+	_ = batch
+
+	jsonFile, err := os.Open(path.Join("data", "processed", "darwin-options.json"))
+	if err != nil {
+		return errors.WithMessage(err, "error opening json file")
+	}
+
+	dec := jstream.NewDecoder(jsonFile, 1)
+	var opt options.NixOption
+	ms, err := mapstructure.NewDecoder(&mapstructure.DecoderConfig{
+		ErrorUnused: true,
+		ZeroFields:  true,
+		Result:      &opt,
+	})
+	if err != nil {
+		return errors.WithMessage(err, "could not create struct decoder")
+	}
+	for mv := range dec.Stream() {
+		err := ms.Decode(mv.Value) // stores in opt
+
+		if err != nil {
+			return errors.WithMessagef(err, "could not decode object into option, object: %#v", mv.Value)
+		}
+
+		docs.Store(opt.Option, opt)
+
+		err = batch.Index(opt.Option, opt)
+		if err != nil {
+			return errors.WithMessagef(err, "could not index option %s", opt.Option)
+		}
+	}
+	err = index.Batch(batch)
+	if err != nil {
+		return errors.WithMessage(err, "failed to run batch index operation")
+	}
+
+	return nil
+}
+
+func Search[T options.NixOption](ctx context.Context, keyword string) (*Result[T], error) {
+	query := bleve.NewMatchQuery(keyword)
+	search := bleve.NewSearchRequest(query)
+
+	bleveResult, err := index.SearchInContext(ctx, search)
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	default:
+		if err != nil {
+			return nil, errors.WithMessage(err, "failed to execute search query")
+		}
+
+		results := make([]T, min(maxResults, bleveResult.Total))
+		for i, result := range bleveResult.Hits {
+			doc, _ := docs.Load(result.ID)
+			results[i] = doc.(T)
+			if i > maxResults {
+				break
+			}
+		}
+
+		return &Result[T]{
+			bleveResult,
+			results,
+		}, nil
+	}
+}
+
+func Load(name string) any {
+	doc, _ := docs.Load(name)
+
+	return doc
+}
-- 
cgit 1.4.1