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brandonkachenbrandonkachen
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refactor(cli): consolidate block utils and add tree traversal primitives (Commit 2.2)
- Create cli/src/utils/block-tree-utils.ts with unified block tree utilities: - traverseBlocks (visitor pattern for recursive traversal) - findBlockByPredicate (generic block finder) - mapBlocks (recursive transformation with reference equality) - updateBlockById, updateAgentBlockById, toggleBlockCollapse - Migrate message-block-helpers.ts to use new utilities: - autoCollapseBlocks now uses mapBlocks - findAgentTypeById now uses findBlockByPredicate - checkBlockIsUnderParent uses findBlockByPredicate (removed findBlockInChildren) - transformAskUserBlocks and updateToolBlockWithOutput use mapBlocks - Removed lodash isEqual import - Add CollapsibleBlock type and isCollapsibleBlock type guard - Refactor use-chat-messages.ts to use updateBlockById + toggleBlockCollapse - Add 16 tests for block-tree-utils
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‎REFACTORING_PLAN.md‎

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@@ -15,8 +15,8 @@ This document outlines a prioritized refactoring plan for the 51 issues identifi
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## Progress Tracker
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> **Last Updated:** 2025-01-20 (Commit 2.1 Complete)
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> **Current Status:** Ready for Commit 2.2 (block utils + think tags)
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> **Last Updated:** 2025-01-20 (Commits 2.1–2.2 Complete)
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> **Current Status:** Ready for Commit 2.3 (run-agent-step)
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### Phase 1 Progress
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| Commit | Description | Status | Completed By |
@@ -31,7 +31,7 @@ This document outlines a prioritized refactoring plan for the 51 issues identifi
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| Commit | Description | Status | Completed By |
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|--------|-------------|--------|-------------|
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| 2.1 | Refactor use-send-message.ts | ✅ Complete | Codebuff |
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| 2.2 | Consolidate block utils + think tags | ⬜ Not Started | - |
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| 2.2 | Consolidate block utils + think tags | ✅ Complete | Codebuff |
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| 2.3 | Refactor loopAgentSteps | ⬜ Not Started | - |
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| 2.4 | Consolidate billing duplication | ⬜ Not Started | - |
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| 2.5a | Extract multiline keyboard navigation | ⬜ Not Started | - |
@@ -211,26 +211,44 @@ This document outlines a prioritized refactoring plan for the 51 issues identifi
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---
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### Commit 2.2: Consolidate Block Utils and Think Tag Parsing
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### Commit 2.2: Consolidate Block Utils and Think Tag Parsing ✅ COMPLETE
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**Files:** Multiple CLI files + `utils/think-tag-parser.ts`
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**Est. Time:** 3-4 hours
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**Est. LOC Changed:** ~550-650
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**Actual Time:** ~4 hours
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**Est. LOC Changed:** ~550-650
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**Actual LOC Changed:** 576 insertions, 200 deletions
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> ⚠️ **Corrected:** `think-tag-parser.ts` already exists. Task is migration/consolidation, not creation.
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| Task | Description | Status |
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|------|-------------|--------|
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| Audit all `updateBlocksRecursively` usages | Mapped implementations and reduced duplication | ✅ |
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| Create `utils/block-tree-utils.ts` | Unified block tree operations (traverse, find, update, map) | ✅ |
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| Refactor `use-chat-messages.ts` | Use `updateBlockById` + `toggleBlockCollapse` for block toggling | ✅ |
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| Refactor `updateBlocksRecursively` | Delegate to `updateAgentBlockById` from block-tree utils | ✅ |
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| Migrate `autoCollapseBlocks` | Now uses `mapBlocks` (removed 25 lines of manual recursion) | ✅ |
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| Migrate `findAgentTypeById` | Now uses `findBlockByPredicate` (reduced from 15 to 6 lines) | ✅ |
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| Migrate `checkBlockIsUnderParent` | Now uses `findBlockByPredicate` (removed `findBlockInChildren` helper) | ✅ |
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| Migrate `transformAskUserBlocks` | Now uses `mapBlocks` (removed nested recursion) | ✅ |
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| Migrate `updateToolBlockWithOutput` | Now uses `mapBlocks` (removed lodash `isEqual` import) | ✅ |
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| Add `CollapsibleBlock` type | Type-safe collapse toggling with `isCollapsibleBlock` guard | ✅ |
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| Add unit tests | `block-tree-utils.test.ts` with 19 tests for all utilities | ✅ |
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| Fix `traverseBlocks` early exit bug | Stop signal now propagates from nested calls | ✅ |
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| Task | Description |
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|------|-------------|
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| Audit all `updateBlocksRecursively` usages | Map duplicates |
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| Create `utils/block-tree-utils.ts` | Unified block tree operations |
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| Audit all think tag parsing | Map implementations |
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| Migrate to existing `think-tag-parser.ts` | Use as single source |
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| Add type-safe variants | `updateBlockById`, `parseThinkTags` |
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| Replace all usages | Update imports across CLI |
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| Add unit tests | Cover edge cases |
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**New Files Created:**
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- `cli/src/utils/block-tree-utils.ts` - Unified block tree utilities:
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- `traverseBlocks` (visitor pattern with early exit)
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- `findBlockByPredicate` (generic block finder)
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- `mapBlocks` (recursive transformation with reference equality)
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- `updateBlockById`, `updateAgentBlockById`, `toggleBlockCollapse`
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- `cli/src/utils/__tests__/block-tree-utils.test.ts` - 19 comprehensive tests
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**Type Additions:**
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- `CollapsibleBlock` union type in `cli/src/types/chat.ts`
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- `isCollapsibleBlock` type guard for safe collapse toggling
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**Dependencies:** None
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**Risk:** Low
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**Rollback:** Revert single commit
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**Rollback:** Revert single commit
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**Commit:** `c7be7d70e`
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---
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‎cli/src/hooks/use-chat-messages.ts‎

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import { useCallback, useEffect, useMemo, useRef, useState } from 'react'
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import { toggleBlockCollapse, updateBlockById } from '../utils/block-tree-utils'
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import { buildMessageTree } from '../utils/message-tree-utils'
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import type { ChatMessage, ContentBlock } from '../types/chat'
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// Handle blocks within messages
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if (!message.blocks) return message
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const updateBlocksRecursively = (
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blocks: ContentBlock[],
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): ContentBlock[] => {
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let foundTarget = false
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const result = blocks.map((block) => {
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// Handle thinking blocks - just match by thinkingId
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if (block.type === 'text' && block.thinkingId === id) {
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foundTarget = true
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const wasCollapsed = block.isCollapsed ?? false
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return {
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...block,
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isCollapsed: !wasCollapsed,
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userOpened: wasCollapsed, // Mark as user-opened if expanding
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}
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}
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// Handle agent blocks
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if (block.type === 'agent' && block.agentId === id) {
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foundTarget = true
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const wasCollapsed = block.isCollapsed ?? false
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return {
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...block,
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isCollapsed: !wasCollapsed,
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userOpened: wasCollapsed, // Mark as user-opened if expanding
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}
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}
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// Handle tool blocks
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if (block.type === 'tool' && block.toolCallId === id) {
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foundTarget = true
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const wasCollapsed = block.isCollapsed ?? false
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return {
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...block,
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isCollapsed: !wasCollapsed,
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userOpened: wasCollapsed, // Mark as user-opened if expanding
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}
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}
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// Handle agent-list blocks
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if (block.type === 'agent-list' && block.id === id) {
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foundTarget = true
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const wasCollapsed = block.isCollapsed ?? false
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return {
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...block,
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isCollapsed: !wasCollapsed,
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userOpened: wasCollapsed, // Mark as user-opened if expanding
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}
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}
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// Recursively update nested blocks inside agent blocks
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if (block.type === 'agent' && block.blocks) {
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const updatedBlocks = updateBlocksRecursively(block.blocks)
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// Only create new block if nested blocks actually changed
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if (updatedBlocks !== block.blocks) {
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foundTarget = true
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return {
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...block,
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blocks: updatedBlocks,
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}
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}
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}
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return block
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})
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// Return original array reference if nothing changed
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return foundTarget ? result : blocks
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}
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// Use unified block tree utility + shared collapse helper
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const updatedBlocks = updateBlockById(
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message.blocks,
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id,
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toggleBlockCollapse,
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)
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// Only create new message if blocks actually changed
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if (updatedBlocks === message.blocks) return message
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return {
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...message,
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blocks: updateBlocksRecursively(message.blocks),
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blocks: updatedBlocks,
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}
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})
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})

‎cli/src/types/chat.ts‎

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| ToolContentBlock
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| PlanContentBlock
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/**
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* Block types that support collapse state (isCollapsed/userOpened).
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* Used for type-safe collapse toggling operations.
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*/
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export type CollapsibleBlock =
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| AgentContentBlock
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| AgentListContentBlock
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| ImageContentBlock
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| TextContentBlock
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| ToolContentBlock
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export type AgentMessage = {
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agentName: string
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agentType: string
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export function isImageBlock(block: ContentBlock): block is ImageContentBlock {
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return block.type === 'image'
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}
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/**
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* Type guard for blocks that support collapse state (isCollapsed/userOpened).
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*/
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export function isCollapsibleBlock(block: ContentBlock): block is CollapsibleBlock {
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return (
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block.type === 'agent' ||
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block.type === 'agent-list' ||
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block.type === 'image' ||
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block.type === 'text' ||
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block.type === 'tool'
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)
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}

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