mirror of
https://github.com/getcompanion-ai/co-mono.git
synced 2026-04-16 15:02:32 +00:00
Session tree: simplify types, add branching API, comprehensive tests
Types: - SessionEntryBase with type field, extended by all entry types - CustomEntry for hooks (type: 'custom', customType, data) - Remove XXXContent types and TreeNode (redundant) API: - Rename saveXXX to appendXXX with JSDoc explaining tree semantics - Rename branchInPlace to branch() with better docs - Add createBranchedSession(leafId) replacing index-based version - Add getTree() returning SessionTreeNode[] for tree traversal - Add appendCustomEntry(customType, data) for hooks Tests: - tree-traversal.test.ts: 28 tests covering append, getPath, getTree, branch, branchWithSummary, createBranchedSession - save-entry.test.ts: custom entry integration Docs: - Class-level JSDoc explaining append-only tree model - Method docs explaining leaf advancement and branching - CHANGELOG.md entry for all changes
This commit is contained in:
Mario Zechner
parent
beb70f126d
commit
6f94e24629
8 changed files with 779 additions and 135 deletions
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@ -211,7 +211,7 @@ export class AgentSession {
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// Handle session persistence
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if (event.type === "message_end") {
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this.sessionManager.saveMessage(event.message);
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this.sessionManager.appendMessage(event.message);
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// Track assistant message for auto-compaction (checked on agent_end)
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if (event.message.role === "assistant") {
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@ -535,7 +535,7 @@ export class AgentSession {
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this._disconnectFromAgent();
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await this.abort();
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this.agent.reset();
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this.sessionManager.reset();
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this.sessionManager.newSession();
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this._queuedMessages = [];
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this._reconnectToAgent();
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@ -572,7 +572,7 @@ export class AgentSession {
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}
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this.agent.setModel(model);
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this.sessionManager.saveModelChange(model.provider, model.id);
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this.sessionManager.appendModelChange(model.provider, model.id);
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this.settingsManager.setDefaultModelAndProvider(model.provider, model.id);
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// Re-clamp thinking level for new model's capabilities
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@ -611,7 +611,7 @@ export class AgentSession {
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// Apply model
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this.agent.setModel(next.model);
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this.sessionManager.saveModelChange(next.model.provider, next.model.id);
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this.sessionManager.appendModelChange(next.model.provider, next.model.id);
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this.settingsManager.setDefaultModelAndProvider(next.model.provider, next.model.id);
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// Apply thinking level (setThinkingLevel clamps to model capabilities)
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@ -638,7 +638,7 @@ export class AgentSession {
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}
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this.agent.setModel(nextModel);
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this.sessionManager.saveModelChange(nextModel.provider, nextModel.id);
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this.sessionManager.appendModelChange(nextModel.provider, nextModel.id);
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this.settingsManager.setDefaultModelAndProvider(nextModel.provider, nextModel.id);
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// Re-clamp thinking level for new model's capabilities
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@ -671,7 +671,7 @@ export class AgentSession {
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effectiveLevel = "high";
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}
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this.agent.setThinkingLevel(effectiveLevel);
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this.sessionManager.saveThinkingLevelChange(effectiveLevel);
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this.sessionManager.appendThinkingLevelChange(effectiveLevel);
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this.settingsManager.setDefaultThinkingLevel(effectiveLevel);
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}
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@ -831,7 +831,7 @@ export class AgentSession {
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throw new Error("Compaction cancelled");
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}
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this.sessionManager.saveCompaction(summary, firstKeptEntryId, tokensBefore);
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this.sessionManager.appendCompaction(summary, firstKeptEntryId, tokensBefore);
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const newEntries = this.sessionManager.getEntries();
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const sessionContext = this.sessionManager.buildSessionContext();
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this.agent.replaceMessages(sessionContext.messages);
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@ -1013,7 +1013,7 @@ export class AgentSession {
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return;
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}
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this.sessionManager.saveCompaction(summary, firstKeptEntryId, tokensBefore);
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this.sessionManager.appendCompaction(summary, firstKeptEntryId, tokensBefore);
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const newEntries = this.sessionManager.getEntries();
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const sessionContext = this.sessionManager.buildSessionContext();
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this.agent.replaceMessages(sessionContext.messages);
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@ -1271,7 +1271,7 @@ export class AgentSession {
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this.agent.appendMessage(bashMessage);
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// Save to session
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this.sessionManager.saveMessage(bashMessage);
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this.sessionManager.appendMessage(bashMessage);
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}
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return result;
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@ -1309,7 +1309,7 @@ export class AgentSession {
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this.agent.appendMessage(bashMessage);
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// Save to session
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this.sessionManager.saveMessage(bashMessage);
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this.sessionManager.appendMessage(bashMessage);
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}
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this._pendingBashMessages = [];
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@ -1431,8 +1431,12 @@ export class AgentSession {
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skipConversationRestore = result?.skipConversationRestore ?? false;
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}
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// Create branched session (returns null in --no-session mode)
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const newSessionFile = this.sessionManager.createBranchedSessionFromEntries(entries, entryIndex);
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// Create branched session ending before the selected message (returns null in --no-session mode)
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// User will re-enter/edit the selected message
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if (!selectedEntry.parentId) {
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throw new Error("Cannot branch from first message");
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}
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const newSessionFile = this.sessionManager.createBranchedSession(selectedEntry.parentId);
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// Update session file if we have one (file-based mode)
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if (newSessionFile !== null) {
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@ -26,54 +26,47 @@ export interface SessionHeader {
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branchedFrom?: string;
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}
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export interface MessageContent {
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type: "message";
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message: AppMessage;
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}
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export interface ThinkingLevelContent {
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type: "thinking_level_change";
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thinkingLevel: string;
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}
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export interface ModelChangeContent {
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type: "model_change";
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provider: string;
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modelId: string;
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}
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export interface CompactionContent {
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type: "compaction";
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summary: string;
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firstKeptEntryId: string;
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tokensBefore: number;
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}
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export interface BranchSummaryContent {
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type: "branch_summary";
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summary: string;
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}
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/** Union of all content types (for "write" methods in SessionManager) */
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export type SessionContent =
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| MessageContent
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| ThinkingLevelContent
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| ModelChangeContent
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| CompactionContent
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| BranchSummaryContent;
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export interface TreeNode {
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export interface SessionEntryBase {
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type: string;
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id: string;
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parentId: string | null;
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timestamp: string;
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}
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export type SessionMessageEntry = TreeNode & MessageContent;
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export type ThinkingLevelChangeEntry = TreeNode & ThinkingLevelContent;
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export type ModelChangeEntry = TreeNode & ModelChangeContent;
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export type CompactionEntry = TreeNode & CompactionContent;
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export type BranchSummaryEntry = TreeNode & BranchSummaryContent;
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export interface SessionMessageEntry extends SessionEntryBase {
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type: "message";
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message: AppMessage;
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}
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export interface ThinkingLevelChangeEntry extends SessionEntryBase {
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type: "thinking_level_change";
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thinkingLevel: string;
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}
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export interface ModelChangeEntry extends SessionEntryBase {
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type: "model_change";
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provider: string;
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modelId: string;
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}
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export interface CompactionEntry extends SessionEntryBase {
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type: "compaction";
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summary: string;
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firstKeptEntryId: string;
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tokensBefore: number;
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}
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export interface BranchSummaryEntry extends SessionEntryBase {
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type: "branch_summary";
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summary: string;
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}
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/** Custom entry for hooks. Use customType to identify your hook's entries. */
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export interface CustomEntry extends SessionEntryBase {
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type: "custom";
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customType: string;
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data?: unknown;
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}
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/** Session entry - has id/parentId for tree structure (returned by "read" methods in SessionManager) */
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export type SessionEntry =
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@ -81,11 +74,18 @@ export type SessionEntry =
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| ThinkingLevelChangeEntry
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| ModelChangeEntry
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| CompactionEntry
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| BranchSummaryEntry;
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| BranchSummaryEntry
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| CustomEntry;
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/** Raw file entry (includes header) */
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export type FileEntry = SessionHeader | SessionEntry;
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/** Tree node for getTree() - defensive copy of session structure */
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export interface SessionTreeNode {
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entry: SessionEntry;
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children: SessionTreeNode[];
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}
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export interface SessionContext {
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messages: AppMessage[];
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thinkingLevel: string;
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@ -387,6 +387,17 @@ export function findMostRecentSession(sessionDir: string): string | null {
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}
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}
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/**
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* Manages conversation sessions as append-only trees stored in JSONL files.
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*
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* Each session entry has an id and parentId forming a tree structure. The "leaf"
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* pointer tracks the current position. Appending creates a child of the current leaf.
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* Branching moves the leaf to an earlier entry, allowing new branches without
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* modifying history.
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*
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* Use buildSessionContext() to get the resolved message list for the LLM, which
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* handles compaction summaries and follows the path from root to current leaf.
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*/
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export class SessionManager {
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private sessionId: string = "";
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private sessionFile: string = "";
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@ -394,7 +405,7 @@ export class SessionManager {
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private cwd: string;
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private persist: boolean;
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private flushed: boolean = false;
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private inMemoryEntries: FileEntry[] = [];
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private fileEntries: FileEntry[] = [];
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private byId: Map<string, SessionEntry> = new Map();
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private leafId: string = "";
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@ -409,7 +420,7 @@ export class SessionManager {
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if (sessionFile) {
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this.setSessionFile(sessionFile);
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} else {
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this._initNewSession();
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this.newSession();
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}
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}
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@ -417,22 +428,22 @@ export class SessionManager {
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setSessionFile(sessionFile: string): void {
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this.sessionFile = resolve(sessionFile);
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if (existsSync(this.sessionFile)) {
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this.inMemoryEntries = loadEntriesFromFile(this.sessionFile);
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const header = this.inMemoryEntries.find((e) => e.type === "session") as SessionHeader | undefined;
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this.fileEntries = loadEntriesFromFile(this.sessionFile);
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const header = this.fileEntries.find((e) => e.type === "session") as SessionHeader | undefined;
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this.sessionId = header?.id ?? randomUUID();
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if (migrateToCurrentVersion(this.inMemoryEntries)) {
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if (migrateToCurrentVersion(this.fileEntries)) {
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this._rewriteFile();
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}
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this._buildIndex();
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this.flushed = true;
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} else {
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this._initNewSession();
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this.newSession();
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}
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}
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private _initNewSession(): void {
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newSession(): void {
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this.sessionId = randomUUID();
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const timestamp = new Date().toISOString();
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const header: SessionHeader = {
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@ -442,7 +453,7 @@ export class SessionManager {
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timestamp,
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cwd: this.cwd,
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};
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this.inMemoryEntries = [header];
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this.fileEntries = [header];
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this.byId.clear();
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this.leafId = "";
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this.flushed = false;
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@ -456,7 +467,7 @@ export class SessionManager {
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private _buildIndex(): void {
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this.byId.clear();
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this.leafId = "";
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for (const entry of this.inMemoryEntries) {
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for (const entry of this.fileEntries) {
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if (entry.type === "session") continue;
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this.byId.set(entry.id, entry);
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this.leafId = entry.id;
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@ -465,7 +476,7 @@ export class SessionManager {
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private _rewriteFile(): void {
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if (!this.persist) return;
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const content = `${this.inMemoryEntries.map((e) => JSON.stringify(e)).join("\n")}\n`;
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const content = `${this.fileEntries.map((e) => JSON.stringify(e)).join("\n")}\n`;
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writeFileSync(this.sessionFile, content);
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}
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@ -489,18 +500,14 @@ export class SessionManager {
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return this.sessionFile;
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}
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reset(): void {
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this._initNewSession();
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}
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_persist(entry: SessionEntry): void {
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if (!this.persist) return;
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const hasAssistant = this.inMemoryEntries.some((e) => e.type === "message" && e.message.role === "assistant");
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const hasAssistant = this.fileEntries.some((e) => e.type === "message" && e.message.role === "assistant");
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if (!hasAssistant) return;
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if (!this.flushed) {
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for (const e of this.inMemoryEntries) {
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for (const e of this.fileEntries) {
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appendFileSync(this.sessionFile, `${JSON.stringify(e)}\n`);
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}
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this.flushed = true;
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@ -510,13 +517,14 @@ export class SessionManager {
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}
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private _appendEntry(entry: SessionEntry): void {
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this.inMemoryEntries.push(entry);
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this.fileEntries.push(entry);
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this.byId.set(entry.id, entry);
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this.leafId = entry.id;
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this._persist(entry);
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}
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saveMessage(message: AppMessage): string {
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/** Append a message as child of current leaf, then advance leaf. Returns entry id. */
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appendMessage(message: AppMessage): string {
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const entry: SessionMessageEntry = {
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type: "message",
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id: generateId(this.byId),
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@ -528,7 +536,8 @@ export class SessionManager {
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return entry.id;
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}
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saveThinkingLevelChange(thinkingLevel: string): string {
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/** Append a thinking level change as child of current leaf, then advance leaf. Returns entry id. */
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appendThinkingLevelChange(thinkingLevel: string): string {
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const entry: ThinkingLevelChangeEntry = {
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type: "thinking_level_change",
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id: generateId(this.byId),
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@ -540,7 +549,8 @@ export class SessionManager {
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return entry.id;
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}
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saveModelChange(provider: string, modelId: string): string {
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/** Append a model change as child of current leaf, then advance leaf. Returns entry id. */
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appendModelChange(provider: string, modelId: string): string {
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const entry: ModelChangeEntry = {
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type: "model_change",
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id: generateId(this.byId),
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@ -553,7 +563,8 @@ export class SessionManager {
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return entry.id;
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}
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saveCompaction(summary: string, firstKeptEntryId: string, tokensBefore: number): string {
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/** Append a compaction summary as child of current leaf, then advance leaf. Returns entry id. */
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appendCompaction(summary: string, firstKeptEntryId: string, tokensBefore: number): string {
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const entry: CompactionEntry = {
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type: "compaction",
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id: generateId(this.byId),
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@ -567,6 +578,20 @@ export class SessionManager {
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return entry.id;
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}
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/** Append a custom entry (for hooks) as child of current leaf, then advance leaf. Returns entry id. */
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appendCustomEntry(customType: string, data?: unknown): string {
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const entry: CustomEntry = {
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type: "custom",
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customType,
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data,
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id: generateId(this.byId),
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parentId: this.leafId || null,
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timestamp: new Date().toISOString(),
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};
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this._appendEntry(entry);
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return entry.id;
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}
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// =========================================================================
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// Tree Traversal
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// =========================================================================
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@ -575,11 +600,19 @@ export class SessionManager {
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return this.leafId;
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}
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getLeafEntry(): SessionEntry | undefined {
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return this.byId.get(this.leafId);
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}
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getEntry(id: string): SessionEntry | undefined {
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return this.byId.get(id);
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}
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/** Walk from entry to root, returning path (conversation entries only) */
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/**
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* Walk from entry to root, returning all entries in path order.
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* Includes all entry types (messages, compaction, model changes, etc.).
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* Use buildSessionContext() to get the resolved messages for the LLM.
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*/
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getPath(fromId?: string): SessionEntry[] {
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const path: SessionEntry[] = [];
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let current = this.byId.get(fromId ?? this.leafId);
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@ -602,31 +635,75 @@ export class SessionManager {
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* Get session header.
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*/
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getHeader(): SessionHeader | null {
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const h = this.inMemoryEntries.find((e) => e.type === "session");
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const h = this.fileEntries.find((e) => e.type === "session");
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return h ? (h as SessionHeader) : null;
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}
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/**
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* Get all session entries (excludes header). Returns a defensive copy.
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* Use buildSessionContext() if you need the messages for the LLM.
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* Get all session entries (excludes header). Returns a shallow copy.
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* The session is append-only: use appendXXX() to add entries, branch() to
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* change the leaf pointer. Entries cannot be modified or deleted.
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*/
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getEntries(): SessionEntry[] {
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return this.inMemoryEntries.filter((e): e is SessionEntry => e.type !== "session");
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return this.fileEntries.filter((e): e is SessionEntry => e.type !== "session");
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}
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/**
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* Get the session as a tree structure. Returns a shallow defensive copy of all entries.
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* A well-formed session has exactly one root (first entry with parentId === null).
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* Orphaned entries (broken parent chain) are also returned as roots.
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*/
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getTree(): SessionTreeNode[] {
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const entries = this.getEntries();
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const nodeMap = new Map<string, SessionTreeNode>();
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const roots: SessionTreeNode[] = [];
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// Create nodes
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for (const entry of entries) {
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nodeMap.set(entry.id, { entry, children: [] });
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}
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// Build tree
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for (const entry of entries) {
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const node = nodeMap.get(entry.id)!;
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if (entry.parentId === null) {
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roots.push(node);
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} else {
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||||
const parent = nodeMap.get(entry.parentId);
|
||||
if (parent) {
|
||||
parent.children.push(node);
|
||||
} else {
|
||||
// Orphan - treat as root
|
||||
roots.push(node);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return roots;
|
||||
}
|
||||
|
||||
// =========================================================================
|
||||
// Branching
|
||||
// =========================================================================
|
||||
|
||||
/** Branch in-place by changing the leaf pointer */
|
||||
branchInPlace(branchFromId: string): void {
|
||||
/**
|
||||
* Start a new branch from an earlier entry.
|
||||
* Moves the leaf pointer to the specified entry. The next appendXXX() call
|
||||
* will create a child of that entry, forming a new branch. Existing entries
|
||||
* are not modified or deleted.
|
||||
*/
|
||||
branch(branchFromId: string): void {
|
||||
if (!this.byId.has(branchFromId)) {
|
||||
throw new Error(`Entry ${branchFromId} not found`);
|
||||
}
|
||||
this.leafId = branchFromId;
|
||||
}
|
||||
|
||||
/** Branch with a summary of the abandoned path */
|
||||
/**
|
||||
* Start a new branch with a summary of the abandoned path.
|
||||
* Same as branch(), but also appends a branch_summary entry that captures
|
||||
* context from the abandoned conversation path.
|
||||
*/
|
||||
branchWithSummary(branchFromId: string, summary: string): string {
|
||||
if (!this.byId.has(branchFromId)) {
|
||||
throw new Error(`Entry ${branchFromId} not found`);
|
||||
|
|
@ -643,35 +720,41 @@ export class SessionManager {
|
|||
return entry.id;
|
||||
}
|
||||
|
||||
createBranchedSessionFromEntries(entries: FileEntry[], branchBeforeIndex: number): string | null {
|
||||
const newSessionId = randomUUID();
|
||||
const timestamp = new Date().toISOString().replace(/[:.]/g, "-");
|
||||
const newSessionFile = join(this.getSessionDir(), `${timestamp}_${newSessionId}.jsonl`);
|
||||
|
||||
const newEntries: FileEntry[] = [];
|
||||
for (let i = 0; i < branchBeforeIndex; i++) {
|
||||
const entry = entries[i];
|
||||
|
||||
if (entry.type === "session") {
|
||||
newEntries.push({
|
||||
...entry,
|
||||
version: CURRENT_SESSION_VERSION,
|
||||
id: newSessionId,
|
||||
timestamp: new Date().toISOString(),
|
||||
branchedFrom: this.persist ? this.sessionFile : undefined,
|
||||
});
|
||||
} else {
|
||||
newEntries.push(entry);
|
||||
}
|
||||
/**
|
||||
* Create a new session file containing only the path from root to the specified leaf.
|
||||
* Useful for extracting a single conversation path from a branched session.
|
||||
* Returns the new session file path, or null if not persisting.
|
||||
*/
|
||||
createBranchedSession(leafId: string): string | null {
|
||||
const path = this.getPath(leafId);
|
||||
if (path.length === 0) {
|
||||
throw new Error(`Entry ${leafId} not found`);
|
||||
}
|
||||
|
||||
const newSessionId = randomUUID();
|
||||
const timestamp = new Date().toISOString();
|
||||
const fileTimestamp = timestamp.replace(/[:.]/g, "-");
|
||||
const newSessionFile = join(this.getSessionDir(), `${fileTimestamp}_${newSessionId}.jsonl`);
|
||||
|
||||
const header: SessionHeader = {
|
||||
type: "session",
|
||||
version: CURRENT_SESSION_VERSION,
|
||||
id: newSessionId,
|
||||
timestamp,
|
||||
cwd: this.cwd,
|
||||
branchedFrom: this.persist ? this.sessionFile : undefined,
|
||||
};
|
||||
|
||||
if (this.persist) {
|
||||
for (const entry of newEntries) {
|
||||
appendFileSync(newSessionFile, `${JSON.stringify(header)}\n`);
|
||||
for (const entry of path) {
|
||||
appendFileSync(newSessionFile, `${JSON.stringify(entry)}\n`);
|
||||
}
|
||||
return newSessionFile;
|
||||
}
|
||||
this.inMemoryEntries = newEntries;
|
||||
|
||||
// In-memory mode: replace current session with the path
|
||||
this.fileEntries = [header, ...path];
|
||||
this.sessionId = newSessionId;
|
||||
this._buildIndex();
|
||||
return null;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue