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internal/util/file.go

@@ -0,0 +1,29 @@
+package util
+
+import (
+	"io/ioutil"
+	"path/filepath"
+	"strings"
+)
+
+// DirByExt returns entries in a directory with the specified extension
+func DirByExt(dir, ext string) ([]string, error) {
+	fis, err := ioutil.ReadDir(dir)
+	if err != nil {
+		return nil, err
+	}
+
+	out := make([]string, 0, len(fis))
+
+	for _, fi := range fis {
+		relname := fi.Name()
+		extname := filepath.Ext(relname)
+
+		// Skip anything that doesn't match the extension
+		if strings.EqualFold(extname, ext) {
+			out = append(out, relname)
+		}
+	}
+
+	return out, nil
+}