Function buildCommandParts

src/utils/bash/bashPipeCommand.ts:119–212

* Builds command parts from parsed entries, handling strings and operators. * Special handling for file descriptor redirections to preserve them as single units.

(
  parsed: ParseEntry[],
  start: number,
  end: number,
)

 * Special handling for file descriptor redirections to preserve them as single units.
 */
function buildCommandParts(
  parsed: ParseEntry[],
  start: number,
  end: number,
): string[] {
  const parts: string[] = []
  // Track if we've seen a non-env-var string token yet
  // Environment variables are only valid at the start of a command
  let seenNonEnvVar = false

  for (let i = start; i < end; i++) {
    const entry = parsed[i]

    // Check for file descriptor redirections (e.g., 2>&1, 2>/dev/null)
    if (
      typeof entry === 'string' &&
      /^[012]$/.test(entry) &&
      i + 2 < end &&
      isOperator(parsed[i + 1])
    ) {
      const op = parsed[i + 1] as { op: string }
      const target = parsed[i + 2]

      // Handle 2>&1 style redirections
      if (
        op.op === '>&' &&
        typeof target === 'string' &&
        /^[012]$/.test(target)
      ) {
        parts.push(`${entry}>&${target}`)
        i += 2
        continue
      }

      // Handle 2>/dev/null style redirections
      if (op.op === '>' && target === '/dev/null') {
        parts.push(`${entry}>/dev/null`)
        i += 2
        continue
      }

      // Handle 2> &1 style (space between > and &1)
      if (
        op.op === '>' &&
        typeof target === 'string' &&
        target.startsWith('&')
      ) {
        const fd = target.slice(1)
        if (/^[012]$/.test(fd)) {
          parts.push(`${entry}>&${fd}`)
          i += 2
          continue
        }
      }
    }

    // Handle regular entries
    if (typeof entry === 'string') {