Function movePromptHistory

packages/opencode/src/cli/cmd/run/prompt.shared.ts:96–153

(state: PromptHistoryState, dir: -1 | 1, text: string, cursor: number)

}

export function movePromptHistory(state: PromptHistoryState, dir: -1 | 1, text: string, cursor: number): PromptMove {
  if (state.items.length === 0) {
    return { state, apply: false }
  }

  if (dir === -1 && cursor !== 0) {
    return { state, apply: false }
  }

  if (dir === 1 && cursor !== Bun.stringWidth(text)) {
    return { state, apply: false }
  }

  if (state.index === null) {
    if (dir === 1) {
      return { state, apply: false }
    }

    const idx = state.items.length - 1
    return {
      state: {
        ...state,
        index: idx,
        draft: text,
      },
      text: state.items[idx].text,
      cursor: 0,
      apply: true,
    }
  }

  const idx = state.index + dir
  if (idx < 0) {
    return { state, apply: false }
  }

  if (idx >= state.items.length) {
    return {
      state: {
        ...state,
        index: null,
      },
      text: state.draft,
      cursor: Bun.stringWidth(state.draft),
      apply: true,
    }
  }

  return {
    state: {
      ...state,
      index: idx,
    },
    text: state.items[idx].text,
    cursor: dir === -1 ? 0 : Bun.stringWidth(state.items[idx].text),
    apply: true,
  }
}