Merge pull request #106 from dallbee/subcommand-usage

Subcommand usage options

1 files changed, 37 insertions, 0 deletions

diff --git a/usage_test.go b/usage_test.go
index d9d33f0..31b439b 100644
--- a/usage_test.go
+++ b/usage_test.go
@@ -266,8 +266,45 @@ Options:
 	p, err := NewParser(Config{}, &args)
 	require.NoError(t, err)
 
+	var help bytes.Buffer
+	p.WriteHelp(&help)
+	assert.Equal(t, expectedHelp, help.String())
+}
+
+func TestUsagWithNestedSubcommands(t *testing.T) {
+	expectedHelp := `Usage: example child nested [--enable] OUTPUT
+
+Positional arguments:
+  OUTPUT
+
+Options:
+  --enable
+
+Global options:
+  --values VALUES        Values
+  --verbose, -v          verbosity level
+  --help, -h             display this help and exit
+`
+
+	var args struct {
+		Verbose bool `arg:"-v" help:"verbosity level"`
+		Child   *struct {
+			Values []float64 `help:"Values"`
+			Nested *struct {
+				Enable bool
+				Output string `arg:"positional,required"`
+			} `arg:"subcommand:nested"`
+		} `arg:"subcommand:child"`
+	}
+
 	os.Args[0] = "example"
+	p, err := NewParser(Config{}, &args)
+	require.NoError(t, err)
+
+	_ = p.Parse([]string{"child", "nested", "value"})
+
 	var help bytes.Buffer
 	p.WriteHelp(&help)
+	fmt.Println(help.String())
 	assert.Equal(t, expectedHelp, help.String())
 }