expose FindFmt function to search for available formatter

closes #130

fmt.go

@@ -53,9 +53,12 @@ type registeredFormatter struct {
 
 var formatters []*registeredFormatter
 
-func findFmt(format string) FormatterFunc {
+// FindFmt searches available formatters registered
+// and returns FormaterFunc matched by given
+// format name or nil otherwise
+func FindFmt(name string) FormatterFunc {
 	for _, el := range formatters {
-		if el.name == format {
+		if el.name == name {
 			return el.fmt
 		}
 	}

fmt_test.go

@@ -14,7 +14,7 @@ func TestShouldFindFormatter(t *testing.T) {
 	}
 
 	for name, shouldFind := range cases {
-		actual := findFmt(name)
+		actual := FindFmt(name)
 		if actual == nil && shouldFind {
 			t.Fatalf("expected %s formatter should be available", name)
 		}

run.go

@@ -125,7 +125,7 @@ func RunWithOptions(suite string, contextInitializer func(suite *Suite), opt Opt
 		fmt.Fprintln(os.Stderr, fmt.Errorf("format \"%s\" does not support concurrent execution", opt.Format))
 		return exitOptionError
 	}
-	formatter := findFmt(opt.Format)
+	formatter := FindFmt(opt.Format)
 	if nil == formatter {
 		var names []string
 		for name := range AvailableFormatters() {

suite_context.go

@@ -115,7 +115,7 @@ func (s *suiteContext) ResetBeforeEachScenario(interface{}) {
 }
 
 func (s *suiteContext) iRunFeatureSuiteWithFormatter(name string) error {
-	f := findFmt(name)
+	f := FindFmt(name)
 	if f == nil {
 		return fmt.Errorf(`formatter "%s" is not available`, name)
 	}