fix: Call error when adding -FILE after parameter name (#227)

Author: night556

CHANGELOG.md

@@ -2,6 +2,8 @@
 
 ### Master
 
+- fix: Invoke error when reading parameter value from file using `-FILE`
+
 ### 3.0.28
 
 - update: meta data

cli/flag_set.go

@@ -15,6 +15,7 @@ package cli
 
 import (
 	"fmt"
+	"strings"
 )
 
 type FlagSet struct {
@@ -59,6 +60,9 @@ func (fs *FlagSet) AddByName(name string) (*Flag, error) {
 	f := &Flag{
 		Name: name,
 	}
+	if strings.HasSuffix(name, "-FILE") {
+		f.Aliases = append(f.Aliases, strings.TrimSuffix(name, "-FILE"))
+	}
 	fs.Add(f)
 	return f, nil
 }

cli/flag_set_test.go

@@ -58,6 +58,11 @@ func TestAddByName(t *testing.T) {
 	assert.Nil(t, f)
 	assert.EqualError(t, err, "flag duplicated --MrX2")
 
+	f, err = fs.AddByName("Mrx-FILE")
+	assert.Nil(t, err)
+	assert.Equal(t, 1, len(f.Aliases))
+	assert.Equal(t, "Mrx", f.Aliases[0])
+
 }
 
 func TestGet(t *testing.T) {