Rewrite as Flutter app and rename to Quicklogmain

Drop the Go/Fyne implementation and replace it with a native Flutter app
targeting Android (primary) and Linux desktop (development). Rename
quicklogger -> quicklog throughout (project, applicationId, MethodChannel,
cache filename, AppBar title, Linux binary).

Storage on Android moves to /Android/data/org.buetow.quicklog/files/ so
MANAGE_EXTERNAL_STORAGE is no longer required. Share-intent receive is
preserved via a Kotlin ShareActivity that writes shared text to the app
cache, which Dart reads through a MethodChannel on app resume; MainActivity
also accepts SEND directly so launchers that prefer the main target work.

New since the Fyne version: an entry browser screen with read-only viewer
and long-press delete.

Cross-compiling to Android ARM from amd64 Linux no longer needs Docker /
fyne-cross / NDK -- flutter build apk emits ARM binaries directly.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

3 files changed, 496 insertions, 0 deletions

diff --git a/lib/screens/entry_browser_screen.dart b/lib/screens/entry_browser_screen.dart
new file mode 100644
index 0000000..5ffa707
--- /dev/null
+++ b/lib/screens/entry_browser_screen.dart
@@ -0,0 +1,170 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:intl/intl.dart';
+import 'package:path/path.dart' as p;
+
+import '../services/log_service.dart';
+import '../services/preferences.dart';
+
+final _displayFormat = DateFormat('yyyy-MM-dd HH:mm:ss');
+
+class EntryBrowserScreen extends StatefulWidget {
+  const EntryBrowserScreen({super.key});
+
+  @override
+  State<EntryBrowserScreen> createState() => _EntryBrowserScreenState();
+}
+
+class _EntryBrowserScreenState extends State<EntryBrowserScreen> {
+  final PreferencesService _prefs = PreferencesService();
+  Future<List<LogEntry>>? _future;
+  String _dir = '';
+
+  @override
+  void initState() {
+    super.initState();
+    _refresh();
+  }
+
+  void _refresh() {
+    setState(() {
+      _future = _load();
+    });
+  }
+
+  Future<List<LogEntry>> _load() async {
+    _dir = await _prefs.directory();
+    return listEntries(_dir);
+  }
+
+  Future<void> _open(LogEntry entry) async {
+    final content = await entry.file.readAsString();
+    if (!mounted) return;
+    await Navigator.of(context).push(
+      MaterialPageRoute(
+        builder: (_) => _EntryDetailScreen(entry: entry, content: content),
+      ),
+    );
+  }
+
+  Future<void> _confirmDelete(LogEntry entry) async {
+    final ok = await showDialog<bool>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Delete entry?'),
+        content: Text(p.basename(entry.file.path)),
+        actions: [
+          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Cancel')),
+          FilledButton(onPressed: () => Navigator.pop(ctx, true), child: const Text('Delete')),
+        ],
+      ),
+    );
+    if (ok == true) {
+      await deleteEntry(entry.file);
+      _refresh();
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Entries'),
+        actions: [
+          IconButton(
+            tooltip: 'Refresh',
+            icon: const Icon(Icons.refresh),
+            onPressed: _refresh,
+          ),
+        ],
+      ),
+      body: FutureBuilder<List<LogEntry>>(
+        future: _future,
+        builder: (ctx, snap) {
+          if (snap.connectionState != ConnectionState.done) {
+            return const Center(child: CircularProgressIndicator());
+          }
+          if (snap.hasError) {
+            return Center(child: Text('Error: ${snap.error}'));
+          }
+          final entries = snap.data ?? const [];
+          if (entries.isEmpty) {
+            return Center(
+              child: Padding(
+                padding: const EdgeInsets.all(24),
+                child: Text(
+                  'No entries in $_dir',
+                  textAlign: TextAlign.center,
+                ),
+              ),
+            );
+          }
+          return RefreshIndicator(
+            onRefresh: () async => _refresh(),
+            child: ListView.separated(
+              itemCount: entries.length,
+              separatorBuilder: (_, _) => const Divider(height: 1),
+              itemBuilder: (_, i) => _EntryTile(
+                entry: entries[i],
+                onTap: () => _open(entries[i]),
+                onLongPress: () => _confirmDelete(entries[i]),
+              ),
+            ),
+          );
+        },
+      ),
+    );
+  }
+}
+
+class _EntryTile extends StatelessWidget {
+  const _EntryTile({required this.entry, required this.onTap, required this.onLongPress});
+  final LogEntry entry;
+  final VoidCallback onTap;
+  final VoidCallback onLongPress;
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(_displayFormat.format(entry.timestamp)),
+      subtitle: FutureBuilder<String>(
+        future: _firstLine(entry.file),
+        builder: (_, snap) => Text(
+          snap.data ?? '',
+          maxLines: 1,
+          overflow: TextOverflow.ellipsis,
+        ),
+      ),
+      onTap: onTap,
+      onLongPress: onLongPress,
+    );
+  }
+
+  Future<String> _firstLine(File f) async {
+    try {
+      final content = await f.readAsString();
+      final i = content.indexOf('\n');
+      return i < 0 ? content : content.substring(0, i);
+    } catch (_) {
+      return '';
+    }
+  }
+}
+
+class _EntryDetailScreen extends StatelessWidget {
+  const _EntryDetailScreen({required this.entry, required this.content});
+  final LogEntry entry;
+  final String content;
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(title: Text(p.basename(entry.file.path))),
+      body: SingleChildScrollView(
+        padding: const EdgeInsets.all(12),
+        child: SelectableText(content),
+      ),
+    );
+  }
+}
diff --git a/lib/screens/home_screen.dart b/lib/screens/home_screen.dart
new file mode 100644
index 0000000..86dd4d0
--- /dev/null
+++ b/lib/screens/home_screen.dart
@@ -0,0 +1,230 @@
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+
+import '../services/log_service.dart';
+import '../services/preferences.dart';
+import '../services/share_service.dart';
+import '../services/shared_text_handler.dart';
+import 'entry_browser_screen.dart';
+import 'preferences_screen.dart';
+
+const int kMaxTextLength = 5000;
+
+class HomeScreen extends StatefulWidget {
+  const HomeScreen({super.key});
+
+  @override
+  State<HomeScreen> createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> with WidgetsBindingObserver {
+  final TextEditingController _controller = TextEditingController();
+  final FocusNode _focusNode = FocusNode();
+  final PreferencesService _prefs = PreferencesService();
+  bool _warnShown = false;
+  bool _loadingShared = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addObserver(this);
+    _controller.addListener(_onTextChanged);
+    if (Platform.isAndroid) {
+      WidgetsBinding.instance.addPostFrameCallback((_) => _loadSharedText());
+    }
+  }
+
+  @override
+  void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
+    _controller.removeListener(_onTextChanged);
+    _controller.dispose();
+    _focusNode.dispose();
+    super.dispose();
+  }
+
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (state == AppLifecycleState.resumed && Platform.isAndroid) {
+      _loadSharedText();
+    }
+  }
+
+  void _onTextChanged() {
+    final length = _controller.text.length;
+    if (_loadingShared) {
+      _warnShown = false;
+      setState(() {});
+      return;
+    }
+    if (length > kMaxTextLength && !_warnShown) {
+      _warnShown = true;
+      _showLengthWarning(length);
+    } else if (length <= kMaxTextLength) {
+      _warnShown = false;
+    }
+    setState(() {});
+  }
+
+  void _showLengthWarning(int length) {
+    showDialog<void>(
+      context: context,
+      builder: (ctx) => AlertDialog(
+        title: const Text('Text Limit'),
+        content: Text(
+          'Text is getting long ($length chars). Consider logging to avoid '
+          'performance issues.',
+        ),
+        actions: [
+          TextButton(onPressed: () => Navigator.of(ctx).pop(), child: const Text('OK')),
+        ],
+      ),
+    );
+  }
+
+  void _resetInput() {
+    _controller.clear();
+    _warnShown = false;
+    setState(() {});
+  }
+
+  Future<void> _logText() async {
+    final dir = await _prefs.directory();
+    try {
+      await logEntry(dir, _controller.text);
+      _resetInput();
+    } catch (e) {
+      _showError(e);
+    }
+  }
+
+  void _showError(Object error) {
+    if (!mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(
+      SnackBar(content: Text('Error: $error'), backgroundColor: Colors.red),
+    );
+  }
+
+  void _showInfo(String title, String message) {
+    if (!mounted) return;
+    ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(message)));
+  }
+
+  Future<void> _loadSharedText() async {
+    final txt = await ShareService.readSharedTextFromCache();
+    if (txt == null || txt.isEmpty) return;
+    _loadingShared = true;
+    final dir = await _prefs.directory();
+    final autoLog = await _prefs.autoLogSharedText();
+    await handleSharedTextLoad(
+      text: txt,
+      autoLog: autoLog,
+      dir: dir,
+      prefill: (s) {
+        _controller.text = s;
+        _controller.selection = TextSelection.collapsed(offset: s.length);
+      },
+      focus: () => _focusNode.requestFocus(),
+      resetInput: _resetInput,
+      clearCache: ShareService.clearSharedTextCache,
+      logFn: (d, t) async {
+        await logEntry(d, t);
+      },
+      showInfo: _showInfo,
+      showError: _showError,
+    );
+    _loadingShared = false;
+    if (mounted) setState(() {});
+  }
+
+  Future<void> _openPreferences() async {
+    await Navigator.of(context).push(
+      MaterialPageRoute(builder: (_) => const PreferencesScreen()),
+    );
+  }
+
+  Future<void> _openEntryBrowser() async {
+    await Navigator.of(context).push(
+      MaterialPageRoute(builder: (_) => const EntryBrowserScreen()),
+    );
+  }
+
+  void _showAbout() {
+    showAboutDialog(
+      context: context,
+      applicationName: 'Quicklog',
+      applicationVersion: '0.1.2',
+      applicationIcon: Image.asset('logo-small.png', width: 48, height: 48),
+      applicationLegalese: 'Jot timestamped markdown notes.',
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    final length = _controller.text.length;
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Quicklog'),
+        actions: [
+          IconButton(
+            tooltip: 'Browse entries',
+            icon: const Icon(Icons.list),
+            onPressed: _openEntryBrowser,
+          ),
+          IconButton(
+            tooltip: 'Preferences',
+            icon: const Icon(Icons.settings),
+            onPressed: _openPreferences,
+          ),
+          IconButton(
+            tooltip: 'About',
+            icon: const Icon(Icons.info_outline),
+            onPressed: _showAbout,
+          ),
+        ],
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(12),
+        child: Column(
+          crossAxisAlignment: CrossAxisAlignment.stretch,
+          children: [
+            Expanded(
+              child: TextField(
+                controller: _controller,
+                focusNode: _focusNode,
+                maxLines: null,
+                expands: true,
+                textAlignVertical: TextAlignVertical.top,
+                decoration: const InputDecoration(
+                  hintText: 'Enter text here...',
+                  border: OutlineInputBorder(),
+                ),
+              ),
+            ),
+            const SizedBox(height: 8),
+            Row(
+              children: [
+                FilledButton.icon(
+                  onPressed: _logText,
+                  icon: const Icon(Icons.save),
+                  label: const Text('Log text'),
+                ),
+                const SizedBox(width: 8),
+                OutlinedButton(
+                  onPressed: () {
+                    _resetInput();
+                    _focusNode.requestFocus();
+                  },
+                  child: const Text('Clear'),
+                ),
+                const Spacer(),
+                Text('$length chars'),
+              ],
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
diff --git a/lib/screens/preferences_screen.dart b/lib/screens/preferences_screen.dart
new file mode 100644
index 0000000..842b6cc
--- /dev/null
+++ b/lib/screens/preferences_screen.dart
@@ -0,0 +1,96 @@
+import 'package:flutter/material.dart';
+
+import '../services/preferences.dart';
+import '../services/storage.dart';
+
+class PreferencesScreen extends StatefulWidget {
+  const PreferencesScreen({super.key});
+
+  @override
+  State<PreferencesScreen> createState() => _PreferencesScreenState();
+}
+
+class _PreferencesScreenState extends State<PreferencesScreen> {
+  final PreferencesService _prefs = PreferencesService();
+  final TextEditingController _dirController = TextEditingController();
+  bool _autoLog = false;
+  bool _loaded = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _load();
+  }
+
+  Future<void> _load() async {
+    _dirController.text = await _prefs.directory();
+    _autoLog = await _prefs.autoLogSharedText();
+    if (!mounted) return;
+    setState(() => _loaded = true);
+  }
+
+  Future<void> _resetToDefault() async {
+    _dirController.text = await defaultLogDirectory();
+    setState(() {});
+  }
+
+  Future<void> _save() async {
+    await _prefs.setDirectory(_dirController.text);
+    await _prefs.setAutoLogSharedText(_autoLog);
+    if (!mounted) return;
+    Navigator.of(context).pop();
+  }
+
+  @override
+  void dispose() {
+    _dirController.dispose();
+    super.dispose();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    if (!_loaded) {
+      return const Scaffold(body: Center(child: CircularProgressIndicator()));
+    }
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Preferences'),
+        actions: [
+          IconButton(
+            tooltip: 'Save',
+            icon: const Icon(Icons.check),
+            onPressed: _save,
+          ),
+        ],
+      ),
+      body: ListView(
+        padding: const EdgeInsets.all(12),
+        children: [
+          const Text('Directory:', style: TextStyle(fontWeight: FontWeight.bold)),
+          const SizedBox(height: 4),
+          TextField(
+            controller: _dirController,
+            decoration: InputDecoration(
+              border: const OutlineInputBorder(),
+              suffixIcon: IconButton(
+                tooltip: 'Reset to default',
+                icon: const Icon(Icons.restore),
+                onPressed: _resetToDefault,
+              ),
+            ),
+          ),
+          const SizedBox(height: 16),
+          SwitchListTile(
+            title: const Text('Auto-log shared text'),
+            subtitle: const Text(
+              'When enabled, text shared from other apps is logged immediately '
+              'instead of prefilled into the editor.',
+            ),
+            value: _autoLog,
+            onChanged: (v) => setState(() => _autoLog = v),
+          ),
+        ],
+      ),
+    );
+  }
+}