providers/os: Add functions to check if something is a dir or file

providers/os/os.go

@@ -29,6 +29,8 @@ func (this *Provider) FuncMap () template.FuncMap {
 	return template.FuncMap {
 		"env":        funcEnv,
 		"fileExists": funcFileExists,
+		"isFile":     funcIsFile,
+		"isDir":      funcIsDir,
 		"statFile":   funcStatFile,
 		"readFile":   funcReadFile,
 		"readDir":    funcReadDir,
@@ -47,6 +49,18 @@ func funcFileExists (name string) (bool) {
 	return err == nil
 }
 
+func funcIsFile (name string) (bool, error) {
+	info, err := os.Stat(name)
+	if err != nil { return false, err }
+	return info.Mode().IsRegular(), nil
+}
+
+func funcIsDir (name string) (bool, error) {
+	info, err := os.Stat(name)
+	if err != nil { return false, err }
+	return info.IsDir(), nil
+}
+
 func funcStatFile (name string) (FileInfo, error) {
 	info, err := os.Stat(name)
 	if err != nil { return FileInfo { }, err }