Move go-sql-queryrepo package into go-kit/sqr

Signed-off-by: Jan Tytgat <jan.tytgat@corelayer.eu>

sqr/loader.go

@@ -0,0 +1,30 @@
+package queryrepo
+
+import (
+	"embed"
+	"fmt"
+	"io/fs"
+	"path"
+	"path/filepath"
+)
+
+// LoadQueryFromFs retrieves a query from a filesystem.
+// It needs the root path to start the search from, as well as a collection name and a query name.
+// The collection name equals to a direct directory name in the root path.
+// The query name is the file name (without extension) to load the contents from.
+// It returns and empty string and an error if the file cannot be found.
+func LoadQueryFromFs(f fs.FS, rootPath, collectionName, queryName string) (string, error) {
+	var err error
+	var contents []byte
+	switch f.(type) {
+	case embed.FS:
+		if contents, err = fs.ReadFile(f, path.Join(rootPath, collectionName, queryName)+".sql"); err != nil {
+			return "", fmt.Errorf("failed to read file %s: %w", path.Join(rootPath, collectionName, queryName)+".sql", err)
+		}
+	default:
+		if contents, err = fs.ReadFile(f, filepath.Join(rootPath, collectionName, queryName)+".sql"); err != nil {
+			return "", fmt.Errorf("failed to read file %s: %w", filepath.Join(rootPath, collectionName, queryName)+".sql", err)
+		}
+	}
+	return string(contents), nil
+}