Function writeDiffToTerminal

src/ink/terminal.ts:198–280

(
  terminal: Terminal,
  diff: Diff,
  skipSyncMarkers = false,
)

}

export function writeDiffToTerminal(
  terminal: Terminal,
  diff: Diff,
  skipSyncMarkers = false,
): number {
  // No output if there are no patches
  if (diff.length === 0) {
    return 0
  }

  // BSU/ESU wrapping is only valid when the terminal actually supports
  // DEC 2026. Callers can still opt out explicitly for high-frequency modes
  // like alt-screen, but unsupported environments such as tmux must never
  // receive the markers on the default main-screen path either.
  const startedAt = nowMs()
  const useSync = !skipSyncMarkers && isSynchronizedOutputSupported()
  const inputPatchTypes = diff.map(patch => patch.type)

  // Buffer all writes into a single string to avoid multiple write calls
  let buffer = useSync ? BSU : ''
  let stdoutPatchBytes = 0
  let stdoutPatchCount = 0

  for (const patch of diff) {
    switch (patch.type) {
      case 'stdout':
        buffer += patch.content
        stdoutPatchBytes += Buffer.byteLength(patch.content)
        stdoutPatchCount += 1
        break
      case 'clear':
        if (patch.count > 0) {
          buffer += eraseLines(patch.count)
        }
        break
      case 'clearTerminal':
        buffer += getResetSequenceForReason(patch.reason)
        break
      case 'cursorHide':
        buffer += HIDE_CURSOR
        break
      case 'cursorShow':
        buffer += SHOW_CURSOR
        break
      case 'cursorMove':
        buffer += cursorMove(patch.x, patch.y)
        break
      case 'cursorTo':
        buffer += cursorTo(patch.col)
        break
      case 'carriageReturn':
        buffer += '\r'
        break
      case 'hyperlink':
        buffer += link(patch.uri)
        break
      case 'styleStr':
        buffer += patch.str