feat: add popular monospace fonts

lib/models/code.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/foundation.dart';
 import 'package:flutter_highlight/theme_map.dart';
+import 'package:git_touch/utils/utils.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 class CodeModel with ChangeNotifier {
@@ -9,7 +10,14 @@ class CodeModel with ChangeNotifier {
 
   static var themes = themeMap.keys.toList();
   static const fontSizes = [12, 13, 14, 15, 16, 17, 18, 19, 20];
-  static const fontFamilies = ['System'];
+  static const fontFamilies = [
+    'System',
+    'Fira Code',
+    'Inconsolata',
+    'PT Mono',
+    'Source Code Pro',
+    'Ubuntu Mono'
+  ];
 
   String _theme = 'github';
   int _fontSize = 14;
@@ -18,6 +26,8 @@ class CodeModel with ChangeNotifier {
   String get theme => _theme;
   int get fontSize => _fontSize;
   String get fontFamily => _fontFamily;
+  String get fontFamilyUsed =>
+      _fontFamily == 'System' ? monospaceFont : _fontFamily;
 
   init() async {
     var prefs = await SharedPreferences.getInstance();

lib/screens/code_settings.dart

@@ -79,7 +79,22 @@ class CodeSettingsScreen extends StatelessWidget {
                   text: Text('Font Family'),
                   rightWidget: Text(codeProvider.fontFamily.toString()),
                   onTap: () {
-                    // TODO:
+                    Provider.of<ThemeModel>(context).showPicker(
+                      context,
+                      children:
+                          CodeModel.fontFamilies.map((k) => Text(k)).toList(),
+                      initialItem: CodeModel.fontFamilies
+                          .indexOf(codeProvider.fontFamily),
+                      onSelectedItemChanged: (int value) {
+                        if (_themeDebounce?.isActive ?? false)
+                          _themeDebounce.cancel();
+                        _themeDebounce =
+                            Timer(const Duration(milliseconds: 500), () {
+                          Provider.of<CodeModel>(context)
+                              .setFontFamily(CodeModel.fontFamilies[value]);
+                        });
+                      },
+                    );
                   },
                 ),
               ],
@@ -92,7 +107,7 @@ class CodeSettingsScreen extends StatelessWidget {
                 theme: themeMap[codeProvider.theme],
                 textStyle: TextStyle(
                   fontSize: codeProvider.fontSize.toDouble(),
-                  fontFamily: monospaceFont,
+                  fontFamily: codeProvider.fontFamilyUsed,
                 ),
                 padding: const EdgeInsets.all(10),
               ),

lib/screens/object.dart

@@ -135,7 +135,7 @@ class ObjectScreen extends StatelessWidget {
             padding: EdgeInsets.all(10),
             textStyle: TextStyle(
                 fontSize: codeProvider.fontSize.toDouble(),
-                fontFamily: monospaceFont),
+                fontFamily: codeProvider.fontFamilyUsed),
           ),
         );
     }

pubspec.yaml

@@ -58,3 +58,37 @@ flutter:
   uses-material-design: true
   assets:
     - images/
+  fonts:
+    - family: Fira Code
+      fonts:
+        - asset: fonts/FiraCode-Regular.ttf
+        - asset: fonts/FiraCode-Bold.ttf
+          weight: 700
+    - family: Inconsolata
+      fonts:
+        - asset: fonts/Inconsolata-Regular.ttf
+        - asset: fonts/Inconsolata-Bold.ttf
+          weight: 700
+    - family: PT Mono
+      fonts:
+        - asset: fonts/PTMono-Regular.ttf
+    - family: Source Code Pro
+      fonts:
+        - asset: fonts/SourceCodePro-Regular.ttf
+        - asset: fonts/SourceCodePro-RegularItalic.ttf
+          style: italic
+        - asset: fonts/SourceCodePro-Bold.ttf
+          weight: 700
+        - asset: fonts/SourceCodePro-BoldItalic.ttf
+          style: italic
+          weight: 700
+    - family: Ubuntu Mono
+      fonts:
+        - asset: fonts/UbuntuMono-Regular.ttf
+        - asset: fonts/UbuntuMono-RegularItalic.ttf
+          style: italic
+        - asset: fonts/UbuntuMono-Bold.ttf
+          weight: 700
+        - asset: fonts/UbuntuMono-BoldItalic.ttf
+          style: italic
+          weight: 700