Adds a few convenience methods to the Entry type

mailcap.go

@@ -137,6 +137,28 @@ func (e Entry) SetAction(action string) error {
 	return nil
 }
 
+// Retrieve the command for a particular action as a string.
+// The string will not have a path inserted into it and will have
+// %s to represent the place that the path will go.
+func (e Entry) GetCommand(action string) (string, error) {
+	if v, ok := e[action]; ok {
+		return v, nil
+	}
+	return "", fmt.Errorf("This entry does not have the action %q available", action)
+}
+
+// Get the available actions/attributes for an entry as
+// a string slice
+func (e Entry) Actions() []string {
+	o := make([]string, len(e))
+	i := 0
+	for k, _ := range e {
+		o[i] = k
+		i++
+	}
+	return o
+}
+
 // Look up all of the Entry types available for 
 // a given mime and key. Returns an Entry slice (Fields)
 func (m *Mailcap) lookup(mime, key string) Entries {