* Gets a ReadStream for /dev/tty when stdin is piped. * This allows interactive Ink rendering even when stdin is a pipe. * Result is cached for the lifetime of the process.
()
| 24 | * Result is cached for the lifetime of the process. |
| 25 | */ |
| 26 | function getStdinOverride(): ReadStream | undefined { |
| 27 | // Return cached result if already computed |
| 28 | if (cachedStdinOverride !== null) { |
| 29 | return cachedStdinOverride |
| 30 | } |
| 31 | |
| 32 | // No override needed if stdin is already a TTY |
| 33 | if (process.stdin.isTTY) { |
| 34 | cachedStdinOverride = undefined |
| 35 | return undefined |
| 36 | } |
| 37 | |
| 38 | // PTY test harnesses and some supervisors provide a valid stdin stream even |
| 39 | // when a compiled runtime misreports process.stdin.isTTY. Do not steal input |
| 40 | // from the harness by reopening /dev/tty in those explicitly marked cases. |
| 41 | if (isStdinOverrideDisabled()) { |
| 42 | cachedStdinOverride = undefined |
| 43 | return undefined |
| 44 | } |
| 45 | |
| 46 | // Skip in CI environments |
| 47 | if (isEnvTruthy(process.env.CI)) { |
| 48 | cachedStdinOverride = undefined |
| 49 | return undefined |
| 50 | } |
| 51 | |
| 52 | // Skip if running MCP (input hijacking breaks MCP) |
| 53 | if (process.argv.includes('mcp')) { |
| 54 | cachedStdinOverride = undefined |
| 55 | return undefined |
| 56 | } |
| 57 | |
| 58 | // No /dev/tty on Windows |
| 59 | if (process.platform === 'win32') { |
| 60 | cachedStdinOverride = undefined |
| 61 | return undefined |
| 62 | } |
| 63 | |
| 64 | // Try to open /dev/tty as an alternative input source |
| 65 | try { |
| 66 | const ttyFd = openSync('/dev/tty', 'r') |
| 67 | const ttyStream = new ReadStream(ttyFd) |
| 68 | // Explicitly set isTTY to true since we know /dev/tty is a TTY. |
| 69 | // This is needed because some runtimes (like Bun's compiled binaries) |
| 70 | // may not correctly detect isTTY on ReadStream created from a file descriptor. |
| 71 | ttyStream.isTTY = true |
| 72 | cachedStdinOverride = ttyStream |
| 73 | return cachedStdinOverride |
| 74 | } catch (err) { |
| 75 | logError(err as Error) |
| 76 | cachedStdinOverride = undefined |
| 77 | return undefined |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Returns base render options for Ink, including stdin override when needed. |
no test coverage detected