Change default struct of Tags in Search Struct (#1437)

Doing this makes it possible to use the method from ArrayString (Contains and Join).
Therefore:
* Tags.Join() would return a string of all the tags separated by commas
* Tags.Contains(str) would return a boolean on whether there is the str or not

config/structs.go

@@ -1,5 +1,9 @@
 package config
 
+import (
+	"strings"
+)
+
 // Config : Configuration for DB, I2P, Fetcher, Go Server and Translation
 type Config struct {
 	Host                   string `json:"host" yaml:"host,omitempty"`
@@ -211,8 +215,10 @@ type SearchConfig struct {
 	ElasticsearchType     string `yaml:"es_type,omitempty"`
 }
 
+// ArrayString is an array of string with some easy functions
 type ArrayString []string
 
+// Contains check if there is a string in the array of string
 func (ar ArrayString) Contains(str string) bool {
 	for _, s := range ar {
 		if s == str {
@@ -222,6 +228,11 @@ func (ar ArrayString) Contains(str string) bool {
 	return false
 }
 
+// Join regroup the array of string in one string separated by commas
+func (ar ArrayString) Join() string {
+	return strings.Join(ar, ",")
+}
+
 var tagtypes map[string]int
 
 func initTagTypes() {

utils/search/tags.go

@@ -2,10 +2,12 @@ package search
 
 import (
 	"strings"
+
+	"github.com/NyaaPantsu/nyaa/config"
 )
 
 // Tags struct for search
-type Tags []string
+type Tags config.ArrayString
 
 // Parse a tag list separated by commas to Tags struct
 func (ta *Tags) Parse(str string) bool {