Initial commit: Claude Code session viewer (Flutter macOS)

A desktop app that parses Claude Code .jsonl session logs and provides
a rich UI for exploring conversations, tool usage, subagents, and token
consumption. Features include project browser with auto-discovery of
~/.claude/projects, conversation timeline with inline subagent expansion,
agents overview, toolbelt chart, and token usage dashboard.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/providers/session_provider.dart

@@ -0,0 +1,117 @@
+import 'package:flutter/foundation.dart';
+import '../models/agent_info.dart';
+import '../models/log_entry.dart';
+import '../services/jsonl_parser.dart';
+
+class SessionProvider with ChangeNotifier {
+  final JsonlParser _parser = JsonlParser();
+
+  SessionLog? _session;
+  bool _isLoading = false;
+  String? _error;
+  String? _filePath;
+
+  // Filter state
+  String? _selectedAgentId;
+  Set<String> _visibleTypes = {'user', 'assistant', 'system'};
+  String _searchQuery = '';
+
+  SessionLog? get session => _session;
+  bool get isLoading => _isLoading;
+  String? get error => _error;
+  String? get filePath => _filePath;
+  String? get selectedAgentId => _selectedAgentId;
+  Set<String> get visibleTypes => _visibleTypes;
+  String get searchQuery => _searchQuery;
+
+  AgentInfo? get selectedAgent {
+    if (_session == null || _selectedAgentId == null) return null;
+    return _session!.agents
+        .where((a) => a.id == _selectedAgentId)
+        .firstOrNull;
+  }
+
+  List<LogEntry> get filteredEntries {
+    if (_session == null) return [];
+
+    List<LogEntry> entries;
+    if (_selectedAgentId != null && _selectedAgentId != 'main') {
+      final agent = selectedAgent;
+      entries = agent?.messages ?? [];
+    } else {
+      entries = _session!.mainConversation;
+    }
+
+    return entries.where((e) {
+      if (!_visibleTypes.contains(e.type)) return false;
+      if (_searchQuery.isNotEmpty) {
+        return _entryMatchesSearch(e, _searchQuery.toLowerCase());
+      }
+      return true;
+    }).toList();
+  }
+
+  bool _entryMatchesSearch(LogEntry entry, String query) {
+    if (entry is UserEntry) {
+      return entry.promptText.toLowerCase().contains(query);
+    }
+    if (entry is AssistantEntry) {
+      for (final block in entry.textBlocks) {
+        if (block.text.toLowerCase().contains(query)) return true;
+      }
+      for (final block in entry.toolUseBlocks) {
+        if (block.name.toLowerCase().contains(query)) return true;
+        if (block.input.toString().toLowerCase().contains(query)) return true;
+      }
+    }
+    return false;
+  }
+
+  Future<void> loadSession(String filePath) async {
+    _isLoading = true;
+    _error = null;
+    _filePath = filePath;
+    _selectedAgentId = null;
+    _searchQuery = '';
+    notifyListeners();
+
+    try {
+      _session = await _parser.parseFile(filePath);
+      _error = null;
+    } catch (e) {
+      _error = e.toString();
+      _session = null;
+    }
+
+    _isLoading = false;
+    notifyListeners();
+  }
+
+  void selectAgent(String? agentId) {
+    _selectedAgentId = agentId;
+    notifyListeners();
+  }
+
+  void toggleTypeFilter(String type) {
+    if (_visibleTypes.contains(type)) {
+      _visibleTypes = Set.from(_visibleTypes)..remove(type);
+    } else {
+      _visibleTypes = Set.from(_visibleTypes)..add(type);
+    }
+    notifyListeners();
+  }
+
+  void setSearchQuery(String query) {
+    _searchQuery = query;
+    notifyListeners();
+  }
+
+  void clearSession() {
+    _session = null;
+    _filePath = null;
+    _error = null;
+    _selectedAgentId = null;
+    _searchQuery = '';
+    notifyListeners();
+  }
+}