Add logLocalTZ to app settings

Allow users to configure their log timezone for all sites.

Advances #2
Closes #8

lib/screens/SettingsScreen.dart

@@ -34,7 +34,9 @@ class _SettingsScreenState extends State<SettingsScreen> {
   @override
   Widget build(BuildContext context) {
     List<Widget> colorSection = [];
+    List<Widget> logSection = [];
 
+    // System Color Configs
     colorSection.add(ConfigItem(
       label: Text('Use system colors'),
       labelWidth: 200,
@@ -63,10 +65,8 @@ class _SettingsScreenState extends State<SettingsScreen> {
             )),
       ));
     }
-
-    List<Widget> items = [];
-    items.add(ConfigSection(children: colorSection));
-    items.add(ConfigItem(
+    // Log Configs
+    logSection.add(ConfigItem(
       label: Text('Wrap log output'),
       labelWidth: 200,
       content: Align(
@@ -81,6 +81,25 @@ class _SettingsScreenState extends State<SettingsScreen> {
             },
           )),
     ));
+    logSection.add(ConfigItem(
+      label: Text('Use Local Time Zone'),
+      labelWidth: 200,
+      content: Align(
+          alignment: Alignment.centerRight,
+          child: Switch.adaptive(
+            materialTapTargetSize: MaterialTapTargetSize.shrinkWrap,
+            value: settings.logLocalTZ,
+            onChanged: (value) {
+              setState(() {
+                settings.logLocalTZ = value;
+              });
+            },
+          )),
+    ));
+
+    List<Widget> items = [];
+    items.add(ConfigSection(children: colorSection));
+    items.add(ConfigSection(children: logSection));
     items.add(ConfigSection(children: [
       ConfigPageItem(
         label: Text('About'),

lib/screens/SiteLogsScreen.dart

@@ -103,8 +103,11 @@ class _SiteLogsScreenState extends State<SiteLogsScreen> {
   loadLogs() async {
     var file = File(widget.site.logFile);
     try {
-      final v = await file.readAsString();
+      String v = await file.readAsString();
 
+      if (settings.logLocalTZ) {
+        v = convertToLocalTZ(v);
+      }
       setState(() {
         logs = v;
       });
@@ -126,4 +129,12 @@ class _SiteLogsScreenState extends State<SiteLogsScreen> {
       return BoxConstraints(minWidth: MediaQuery.of(context).size.width);
     }
   }
+
+  convertToLocalTZ(String rawLog) {
+    rawLog = rawLog.replaceAllMapped(RegExp('time="(.*?)"'), (match) {
+      DateTime userDate = DateTime.parse(match.group(1));
+      return 'time="${userDate.toLocal().toIso8601String()}"';
+    });
+    return rawLog;
+  }
 }

lib/services/settings.dart

@@ -38,6 +38,14 @@ class Settings {
     _set('logWrap', enabled);
   }
 
+  bool get logLocalTZ {
+    return _getBool('logLocalTZ', false);
+  }
+
+  set logLocalTZ(bool enabled) {
+    _set('logLocalTZ', enabled);
+  }
+
   String _getString(String key, String defaultValue) {
     final val = _settings[key];
     if (val is String) {