Function getUniqueForkName

src/commands/branch/branch.ts:179–220

* Generates a unique fork name by checking for collisions with existing session names. * If "baseName (Branch)" already exists, tries "baseName (Branch 2)", "baseName (Branch 3)", etc.

(baseName: string)

 * If "baseName (Branch)" already exists, tries "baseName (Branch 2)", "baseName (Branch 3)", etc.
 */
async function getUniqueForkName(baseName: string): Promise<string> {
  const candidateName = `${baseName} (Branch)`

  // Check if this exact name already exists
  const existingWithExactName = await searchSessionsByCustomTitle(
    candidateName,
    { exact: true },
  )

  if (existingWithExactName.length === 0) {
    return candidateName
  }

  // Name collision - find a unique numbered suffix
  // Search for all sessions that start with the base pattern
  const existingForks = await searchSessionsByCustomTitle(`${baseName} (Branch`)

  // Extract existing fork numbers to find the next available
  const usedNumbers = new Set<number>([1]) // Consider " (Branch)" as number 1
  const forkNumberPattern = new RegExp(
    `^${escapeRegExp(baseName)} \\(Branch(?: (\\d+))?\\)$`,
  )

  for (const session of existingForks) {
    const match = session.customTitle?.match(forkNumberPattern)
    if (match) {
      if (match[1]) {
        usedNumbers.add(parseInt(match[1], 10))
      } else {
        usedNumbers.add(1) // " (Branch)" without number is treated as 1
      }
    }
  }

  // Find the next available number
  let nextNumber = 2
  while (usedNumbers.has(nextNumber)) {
    nextNumber++
  }

  return `${baseName} (Branch ${nextNumber})`
}

export async function call(
  onDone: LocalJSXCommandOnDone,