diff --git a/Cssfile.go b/Cssfile.go
index 6033fbf..ba35413 100644
--- a/Cssfile.go
+++ b/Cssfile.go
@@ -3,18 +3,24 @@ package cssminify
 import (
 	"os"
 	"path/filepath"
-	"regexp"
+	"strings"
 )
 
-func Files() []string {
+// returns all .css files in the passed directory
+func CssFiles(dir string) []string {
 	files := make([]string, 0)
-	filepath.Walk(".",
+	filepath.Walk(dir,
 		func(root string, info os.FileInfo, err error) error {
-			matched, _ := regexp.MatchString(".css$", root)
-			if matched {
+			if strings.HasSuffix(root, ".css") && !strings.HasSuffix(root, "min.css") {
 				files = append(files, root)
 			}
 			return err
 		})
 	return files
 }
+
+// returns all CSS files in the current directory
+// might in the future also return HTML files to allow inline style minification
+func Files() []string {
+	return CssFiles(".")
+}
diff --git a/Minify.go b/Minify.go
index 06d768d..ee43059 100644
--- a/Minify.go
+++ b/Minify.go
@@ -6,6 +6,8 @@ import (
 	"strings"
 )
 
+var spaceRegexp = regexp.MustCompile(`\s{2,}`)
+
 func Minify(blocks []Block, file string) {
 	for _, block := range blocks {
 		showSelectors(string(block.selector))
@@ -45,10 +47,5 @@ func minifyProp(property string) string {
 }
 
 func cleanSpaces(str string) string {
-	str = strings.TrimSpace(str)
-	re := regexp.MustCompile(`\s\s`)
-	for str = re.ReplaceAllString(str, " "); re.Find([]byte(str)) != nil; {
-		str = re.ReplaceAllString(str, " ")
-	}
-	return str
+	return spaceRegexp.ReplaceAllString(strings.TrimSpace(str), " ")
 }