add FindFile to FSHelper

cmd/fs.go

@@ -12,6 +12,7 @@ import (
 	"path"
 	"path/filepath"
 	"runtime"
+	"strings"
 
 	"github.com/leaanthony/slicer"
 )
@@ -47,6 +48,22 @@ func (fs *FSHelper) FileExists(path string) bool {
 	return fi.Mode().IsRegular()
 }
 
+// FindFile returns the first occurrence of match inside path.
+func (fs *FSHelper) FindFile(path, match string) (string, error) {
+	files, err := ioutil.ReadDir(path)
+	if err != nil {
+		return "", err
+	}
+
+	for _, f := range files {
+		if !f.IsDir() && strings.Contains(f.Name(), match) {
+			return f.Name(), nil
+		}
+	}
+
+	return "", fmt.Errorf("file not found")
+}
+
 // CreateFile creates a file at the given filename location with the contents
 // set to the given data. It will create intermediary directories if needed.
 func (fs *FSHelper) CreateFile(filename string, data []byte) error {