Feat: Add epilog after help text

Similar to the Description at the top of the
help text an Epilog is added at the bottom.

Resolves #189

1 files changed, 12 insertions, 0 deletions

diff --git a/parse.go b/parse.go
index a883a10..c8cd79e 100644
--- a/parse.go
+++ b/parse.go
@@ -134,6 +134,7 @@ type Parser struct {
 	config      Config
 	version     string
 	description string
+	epilogue    string
 
 	// the following field changes during processing of command line arguments
 	lastCmd *command
@@ -155,6 +156,14 @@ type Described interface {
 	Description() string
 }
 
+// Epilogued is the interface that the destination struct should implement to
+// add an epilogue string at the bottom of the help message.
+type Epilogued interface {
+	// Epilogue returns the string that will be printed on a line by itself
+	// at the end of the help message.
+	Epilogue() string
+}
+
 // walkFields calls a function for each field of a struct, recursively expanding struct fields.
 func walkFields(t reflect.Type, visit func(field reflect.StructField, owner reflect.Type) bool) {
 	walkFieldsImpl(t, visit, nil)
@@ -236,6 +245,9 @@ func NewParser(config Config, dests ...interface{}) (*Parser, error) {
 		if dest, ok := dest.(Described); ok {
 			p.description = dest.Description()
 		}
+		if dest, ok := dest.(Epilogued); ok {
+			p.epilogue = dest.Epilogue()
+		}
 	}
 
 	return &p, nil