Upgrade to vue3 (#16)

* upgrade to vue 3.x and framework7 8.x
* change calendar plugin to vue-datepicker
* disable export button when user does not hava any transaction
* implement new pin code input
* append thousands separator in amount in exchange rates page

pkg/utils/io.go

@@ -3,8 +3,38 @@ package utils
 import (
 	"io"
 	"os"
+	"strings"
 )
 
+// ListFileNamesWithPrefixAndSuffix returns file name list which has specified prefix and suffix
+func ListFileNamesWithPrefixAndSuffix(path string, prefix string, suffix string) []string {
+	dir, err := os.Open(path)
+
+	if err != nil {
+		return nil
+	}
+
+	fileInfos, err := dir.Readdir(0)
+
+	if err != nil {
+		return nil
+	}
+
+	var fileNames []string
+
+	for i := 0; i < len(fileInfos); i++ {
+		fileInfo := fileInfos[i]
+
+		if !fileInfo.IsDir() &&
+			strings.HasPrefix(fileInfo.Name(), prefix) &&
+			strings.HasSuffix(fileInfo.Name(), suffix) {
+			fileNames = append(fileNames, fileInfo.Name())
+		}
+	}
+
+	return fileNames
+}
+
 // IsExists returns whether specified file or directory path exits
 func IsExists(path string) (bool, error) {
 	_, err := os.Stat(path)