Function useChatInput

cli/src/hooks/use-chat-input.ts:23–106

({
  setInputValue,
  agentMode,
  setAgentMode,
  separatorWidth,
  initialPrompt,
  onSubmitPrompt,
  isCompactHeight,
  isNarrowWidth,
}: UseChatInputOptions)

const BUILD_IT_TEXT = 'Build it!'

export const useChatInput = ({
  setInputValue,
  agentMode,
  setAgentMode,
  separatorWidth,
  initialPrompt,
  onSubmitPrompt,
  isCompactHeight,
  isNarrowWidth,
}: UseChatInputOptions) => {
  const hasAutoSubmittedRef = useRef(false)
  const inputMode = useChatStore((state) => state.inputMode)

  // Estimate the collapsed toggle width as rendered by AgentModeToggle.
  // In Freebuff, the toggle is always hidden, so never reserve width for it.
  // In non-Freebuff: hide in bash mode, compact height, or narrow width.
  const estimatedToggleWidth = IS_FREEBUFF || inputMode !== 'default' || isCompactHeight || isNarrowWidth
    ? 0
    : stringWidth(`< ${agentMode}`) + 6 // 2 padding + 2 borders + 2 gap

  // The content box that wraps the input row has paddingLeft/paddingRight = 1
  // (see cli/src/chat.tsx). Subtract those columns so our MultilineInput width
  // matches the true drawable area between the borders.
  const contentPadding = 2 // 1 left + 1 right padding
  const availableContentWidth = Math.max(1, separatorWidth - contentPadding)
  const inputWidth = Math.max(1, availableContentWidth - estimatedToggleWidth)

  const handleBuildFast = useCallback(() => {
    setAgentMode('DEFAULT')
    setInputValue({
      text: BUILD_IT_TEXT,
      cursorPosition: BUILD_IT_TEXT.length,
      lastEditDueToNav: true,
    })
    setTimeout(() => {
      onSubmitPrompt(BUILD_IT_TEXT, 'DEFAULT')
      setInputValue({ text: '', cursorPosition: 0, lastEditDueToNav: false })
    }, 0)
  }, [setAgentMode, setInputValue, onSubmitPrompt])

  const handleBuildMax = useCallback(() => {
    setAgentMode('MAX')
    setInputValue({
      text: BUILD_IT_TEXT,
      cursorPosition: BUILD_IT_TEXT.length,
      lastEditDueToNav: true,
    })
    setTimeout(() => {
      onSubmitPrompt('Build it!', 'MAX')
      setInputValue({ text: '', cursorPosition: 0, lastEditDueToNav: false })
    }, 0)
  }, [setAgentMode, setInputValue, onSubmitPrompt])

  const handleBuildLite = useCallback(() => {
    setAgentMode('LITE')
    setInputValue({
      text: BUILD_IT_TEXT,
      cursorPosition: BUILD_IT_TEXT.length,