Add flag that gives the ability to disable bash default completion

bash_completions.go

@@ -268,7 +268,7 @@ __%[1]s_handle_word()
 `, name))
 }
 
-func writePostscript(buf *bytes.Buffer, name string) {
+func writePostscript(buf *bytes.Buffer, name string, disableDefaultValues bool) {
 	name = strings.Replace(name, ":", "__", -1)
 	buf.WriteString(fmt.Sprintf("__start_%s()\n", name))
 	buf.WriteString(fmt.Sprintf(`{
@@ -297,13 +297,19 @@ func writePostscript(buf *bytes.Buffer, name string) {
 }
 
 `, name))
+
+	defaultsValue := "-o default"
+	if disableDefaultValues == true {
+		defaultsValue = ""
+	}
+
 	buf.WriteString(fmt.Sprintf(`if [[ $(type -t compopt) = "builtin" ]]; then
-    complete -o default -F __start_%s %s
+    complete %s -F __start_%s %s
 else
-    complete -o default -o nospace -F __start_%s %s
+    complete %s -o nospace -F __start_%s %s
 fi
 
-`, name, name, name, name))
+`, defaultsValue, name, name, defaultsValue, name, name))
 	buf.WriteString("# ex: ts=4 sw=4 et filetype=sh\n")
 }
 
@@ -514,7 +520,7 @@ func (c *Command) GenBashCompletion(w io.Writer) error {
 		buf.WriteString(c.BashCompletionFunction + "\n")
 	}
 	gen(buf, c)
-	writePostscript(buf, c.Name())
+	writePostscript(buf, c.Name(), c.DisableBashCompletionDefaultValues)
 
 	_, err := buf.WriteTo(w)
 	return err

bash_completions_test.go

@@ -215,3 +215,29 @@ func TestBashCompletionDeprecatedFlag(t *testing.T) {
 		t.Errorf("expected completion to not include %q flag: Got %v", flagName, output)
 	}
 }
+
+func TestBashCompletionDisableDefaultValuesSet(t *testing.T) {
+	c := &Command{Run: emptyRun, DisableBashCompletionDefaultValues: true}
+
+	buf := new(bytes.Buffer)
+	c.GenBashCompletion(buf)
+	output := buf.String()
+
+	const defaultOutput = "-o default"
+	if strings.Contains(output, defaultOutput) {
+		t.Errorf("expected completion to not include %q flag: Got %v", defaultOutput, output)
+	}
+}
+
+func TestBashCompletionDisableDefaultValuesUnset(t *testing.T) {
+	c := &Command{Run: emptyRun}
+
+	buf := new(bytes.Buffer)
+	c.GenBashCompletion(buf)
+	output := buf.String()
+
+	const defaultOutput = "-o default"
+	if !strings.Contains(output, defaultOutput) {
+		t.Errorf("expected completion to include %q flag: Got %v", defaultOutput, output)
+	}
+}

command.go

@@ -133,6 +133,12 @@ type Command struct {
 	// DisableSuggestions disables the suggestions based on Levenshtein distance
 	// that go along with 'unknown command' messages.
 	DisableSuggestions bool
+
+	// DisableBashCompletionDefaultValues disables the default values that bash automatically
+	// suggests when the functions generated by the library ultimately don't returns any results
+	// The default suggestions bash gives are the files in the current directory
+	DisableBashCompletionDefaultValues bool
+
 	// SuggestionsMinimumDistance defines minimum levenshtein distance to display suggestions.
 	// Must be > 0.
 	SuggestionsMinimumDistance int