feat: github compare screen (#86)

lib/models/github.dart

@@ -350,3 +350,14 @@ class GithubFilesItem {
   factory GithubFilesItem.fromJson(Map<String, dynamic> json) =>
       _$GithubFilesItemFromJson(json);
 }
+
+@JsonSerializable(fieldRename: FieldRename.snake)
+class GithubComparisonItem {
+  List<GithubFilesItem> files;
+  String status;
+  int aheadBy;
+  int behindBy;
+  GithubComparisonItem();
+  factory GithubComparisonItem.fromJson(Map<String, dynamic> json) =>
+      _$GithubComparisonItemFromJson(json);
+}

lib/models/github.g.dart

@@ -500,3 +500,24 @@ Map<String, dynamic> _$GithubFilesItemToJson(GithubFilesItem instance) =>
       'changes': instance.changes,
       'patch': instance.patch,
     };
+
+GithubComparisonItem _$GithubComparisonItemFromJson(Map<String, dynamic> json) {
+  return GithubComparisonItem()
+    ..files = (json['files'] as List)
+        ?.map((e) => e == null
+            ? null
+            : GithubFilesItem.fromJson(e as Map<String, dynamic>))
+        ?.toList()
+    ..status = json['status'] as String
+    ..aheadBy = json['ahead_by'] as int
+    ..behindBy = json['behind_by'] as int;
+}
+
+Map<String, dynamic> _$GithubComparisonItemToJson(
+        GithubComparisonItem instance) =>
+    <String, dynamic>{
+      'files': instance.files,
+      'status': instance.status,
+      'ahead_by': instance.aheadBy,
+      'behind_by': instance.behindBy,
+    };

lib/router.dart

@@ -38,6 +38,7 @@ import 'package:git_touch/screens/settings.dart';
 import 'package:git_touch/screens/gh_user.dart';
 import 'package:git_touch/screens/gh_users.dart';
 import 'package:git_touch/screens/gh_user_organization.dart';
+import 'package:git_touch/screens/gh_compare.dart';
 // import 'package:git_touch/screens/gh_gists.dart';
 
 class RouterScreen {
@@ -77,6 +78,7 @@ class GithubRouter {
     GithubRouter.watchers,
     GithubRouter.contributors,
     GithubRouter.files,
+    GithubRouter.compare,
   ];
   static final user = RouterScreen('/:login', (_, p) {
     final login = p['login'].first;
@@ -133,6 +135,10 @@ class GithubRouter {
             p['name'].first,
             int.parse(p['number'].first),
           ));
+  static final compare = RouterScreen(
+      '/:owner/:name/compare/:before/:head',
+      (context, p) => GhComparisonScreen(p['owner'].first, p['name'].first,
+          p['before'].first, p['head'].first));
   static final commits = RouterScreen('/:owner/:name/commits',
       (context, p) => GhCommitsScreen(p['owner'].first, p['name'].first));
   static final object = RouterScreen('/:owner/:name/blob/:ref', (_, p) {

lib/screens/gh_compare.dart

@@ -0,0 +1,55 @@
+import 'package:flutter/material.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:git_touch/models/github.dart';
+import 'package:git_touch/scaffolds/refresh_stateful.dart';
+import 'package:git_touch/widgets/app_bar_title.dart';
+import 'package:provider/provider.dart';
+import 'package:git_touch/widgets/files_item.dart';
+import 'package:git_touch/models/auth.dart';
+import 'package:git_touch/widgets/action_button.dart';
+
+class GhComparisonScreen extends StatelessWidget {
+  final String owner;
+  final String name;
+  final String before;
+  final String head;
+  GhComparisonScreen(this.owner, this.name, this.before, this.head);
+
+  Widget build(BuildContext context) {
+    return RefreshStatefulScaffold(
+      title: AppBarTitle('Files'),
+      fetchData: () async {
+        final auth = Provider.of<AuthModel>(context);
+        final res = await auth.ghClient.getJSON(
+          '/repos/$owner/$name/compare/$before...$head',
+          convert: (vs) => GithubComparisonItem.fromJson(vs),
+        );
+        print('/repos/$owner/$name/compare/$before...$head');
+        return res.files;
+      },
+      actionBuilder: (v, _) {
+        return ActionButton(
+          title: 'Actions',
+          items: [
+            ...ActionItem.getUrlActions(
+                'https://github.com/$owner/$name/compare/$before...$head'),
+          ],
+        );
+      },
+      bodyBuilder: (v, _) {
+        return Wrap(
+          children: v
+              .map<Widget>((vs) => FilesItem(
+                    filename: vs.filename,
+                    additions: vs.additions,
+                    deletions: vs.deletions,
+                    status: vs.status,
+                    changes: vs.changes,
+                    patch: vs.patch,
+                  ))
+              .toList(),
+        );
+      },
+    );
+  }
+}

lib/widgets/event_item.dart

@@ -110,7 +110,7 @@ class EventItem extends StatelessWidget {
     final theme = Provider.of<ThemeModel>(context);
     return Link(
       url:
-          'https://github.com/${e.repoOwner}/${e.repoName}/compare/${e.payload.before}...${e.payload.head}',
+          '/${e.repoOwner}/${e.repoName}/compare/${e.payload.before}/${e.payload.head}',
       child: Container(
         padding: EdgeInsets.all(12),
         decoration: BoxDecoration(