Merge pull request #1709 from nirhaas/nhaas/required_flag_with_alias_…

…errors_with_actual_name

Fix missing required flag error uses flag name and not alias

context.go

@@ -204,9 +204,10 @@ func (cCtx *Context) checkRequiredFlags(flags []Flag) requiredFlagsErr {
 			var flagPresent bool
 			var flagName string
 
-			for _, key := range f.Names() {
-				flagName = key
+			flagNames := f.Names()
+			flagName = flagNames[0]
 
+			for _, key := range flagNames {
 				if cCtx.IsSet(strings.TrimSpace(key)) {
 					flagPresent = true
 				}

context_test.go

@@ -602,6 +602,21 @@ func TestCheckRequiredFlags(t *testing.T) {
 				&StringFlag{Name: "n", Required: true},
 			},
 		},
+		{
+			testCase:              "required_flag_with_alias_errors_with_actual_name",
+			expectedAnError:       true,
+			expectedErrorContents: []string{"Required flag \"collection\" not set"},
+			flags: []Flag{
+				&StringFlag{Name: "collection", Required: true, Aliases: []string{"c"}},
+			},
+		},
+		{
+			testCase:        "required_flag_without_name_or_aliases_doesnt_error",
+			expectedAnError: false,
+			flags: []Flag{
+				&StringFlag{Required: true},
+			},
+		},
 	}
 
 	for _, test := range tdata {