fix: Interactive pty identification for proxy mode (#174)

internal/pty/session.go

@@ -36,13 +36,21 @@ type InteractiveSession interface {
 
 // IsInteractiveTerminal returns true if stdin is a real terminal (TTY).
 // Returns false in CI environments (when the "CI" env var set to "true"),
-// when input is piped, or in non-interactive shells.
+// when input or output is piped, or in non-interactive shells.
 func IsInteractiveTerminal() bool {
 	if ci := os.Getenv("CI"); ci != "" && strings.ToLower(ci) == "true" {
 		return false
 	}
 
-	return term.IsTerminal(int(os.Stdin.Fd()))
+	if !term.IsTerminal(int(os.Stdout.Fd())) {
+		return false
+	}
+
+	if !term.IsTerminal(int(os.Stdin.Fd())) {
+		return false
+	}
+
+	return true
 }
 
 var _ InteractiveSession = &session{}

internal/pty/session_test.go

@@ -0,0 +1,49 @@
+package pty
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestIsInteractiveTerminal(t *testing.T) {
+	tests := []struct {
+		name     string
+		ciEnv    string
+		expected bool
+	}{
+		{
+			name:     "returns false when CI env is set to true",
+			ciEnv:    "true",
+			expected: false,
+		},
+		{
+			name:     "returns false when CI env is set to TRUE (case insensitive)",
+			ciEnv:    "TRUE",
+			expected: false,
+		},
+		{
+			name:     "returns false when CI env is set to True (mixed case)",
+			ciEnv:    "True",
+			expected: false,
+		},
+		{
+			name:     "returns false in test runner (stdin/stdout are pipes)",
+			ciEnv:    "",
+			expected: false,
+		},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if tt.ciEnv != "" {
+				t.Setenv("CI", tt.ciEnv)
+			} else {
+				t.Setenv("CI", "")
+			}
+
+			result := IsInteractiveTerminal()
+			assert.Equal(t, tt.expected, result)
+		})
+	}
+}