Display help text for positional arguments

1 files changed, 25 insertions, 2 deletions

diff --git a/usage_test.go b/usage_test.go
index 5a9199c..4a56e6e 100644
--- a/usage_test.go
+++ b/usage_test.go
@@ -16,7 +16,7 @@ func TestWriteUsage(t *testing.T) {
 
 positional arguments:
   input
-  output
+  output                 positional output
 
 options:
   --verbose, -v          verbosity level
@@ -27,7 +27,7 @@ options:
 `
 	var args struct {
 		Input    string   `arg:"positional"`
-		Output   []string `arg:"positional"`
+		Output   []string `arg:"positional,help:positional output"`
 		Verbose  bool     `arg:"-v,help:verbosity level"`
 		Dataset  string   `arg:"help:dataset to use"`
 		Optimize int      `arg:"-O,help:optimization level"`
@@ -45,3 +45,26 @@ options:
 	p.WriteHelp(&help)
 	assert.Equal(t, expectedHelp, help.String())
 }
+
+func TestUsageLongPositionalWithHelp(t *testing.T) {
+	expectedHelp := `usage: example VERYLONGPOSITIONALWITHHELP
+
+positional arguments:
+  verylongpositionalwithhelp
+                         this positional argument is very long
+
+options:
+  --help, -h             display this help and exit
+`
+	var args struct {
+		VeryLongPositionalWithHelp string `arg:"positional,help:this positional argument is very long"`
+	}
+
+	p, err := NewParser(&args)
+	require.NoError(t, err)
+
+	os.Args[0] = "example"
+	var help bytes.Buffer
+	p.WriteHelp(&help)
+	assert.Equal(t, expectedHelp, help.String())
+}