Add search functionality

database.go

@@ -4,12 +4,39 @@ import (
 	"io/fs"
 	"log"
 	"os"
+	"slices"
 	"strings"
+
+	"golang.org/x/text/search"
 )
 
 type Database struct {
 	Keys []string
 	Entries map[string]string
+	matcher *search.Matcher
+}
+
+func (db *Database) search(query string) []string { // returns keys (entry names)
+	results := []string{}
+	// compile patterns
+	queryPatterns := []*search.Pattern{}
+	for _, q := range strings.Split(query, " ") { // per word
+		queryPatterns = append(queryPatterns, db.matcher.CompileString(q))
+	}
+	// search
+	for _, k := range db.Keys {
+		patternsFound := 0
+		for _, p := range queryPatterns {
+			if s, _ := p.IndexString(db.Entries[k]); s != -1 {
+				patternsFound++ // this pattern was found
+			}
+		}
+		if patternsFound == len(queryPatterns) && !slices.Contains(results, k) {
+			// if all patterns were found, add the key (entry name) to the list
+			results = append(results, k)
+		}
+	}
+	return results
 }
 
 func BuildDB(directory string) Database {
@@ -19,14 +46,16 @@ func BuildDB(directory string) Database {
 	var keys []string
 	entries := map[string]string{}
 	// get files in directory and read them
-	directory = strings.TrimRight(directory, "/") // we don't need that last / -> if '/' is used as directory, you are dumb.
+	directory = strings.TrimRight(directory, "/") // we don't need that last /, don't use the root directory /
 	entriesDirFs := os.DirFS(directory)
 	keys, err := fs.Glob(entriesDirFs, "*")
 	if err != nil { logger.Panicln(err) }
 	for _, k := range keys {
 		contentB, err := os.ReadFile(directory + "/" + k)
 		if err != nil { logger.Panicln(err) }
-		entries[k] = string(contentB)
+		content := string(contentB)
+		entries[k] = content
 	}
-	return Database{Keys: keys, Entries: entries}
+	matcher := search.New(ContentLanguage, search.IgnoreCase, search.IgnoreDiacritics)
+	return Database{Keys: keys, Entries: entries, matcher: matcher}
 }