feature: add ${branch_name} option to commit templates (#589)

Author: FreyLuis

src/Models/CommitTemplate.cs

@@ -4,6 +4,7 @@
 using System.Text.RegularExpressions;
 
 using CommunityToolkit.Mvvm.ComponentModel;
+using SourceGit.ViewModels;
 
 namespace SourceGit.Models
 {
@@ -24,9 +25,12 @@ public string Content
             set => SetProperty(ref _content, value);
         }
 
-        public string Apply(List<Change> changes)
+        public string Apply(Repository repo, List<Change> changes)
         {
-            var content = _content.Replace("${files_num}", $"{changes.Count}");
+            var content = _content
+                .Replace("${files_num}", $"{changes.Count}")
+                .Replace("${branch_name}", repo.CurrentBranch.Name);
+
             var matches = REG_COMMIT_TEMPLATE_FILES().Matches(content);
             if (matches.Count == 0)
                 return content;

src/ViewModels/WorkingCopy.cs

@@ -1152,7 +1152,7 @@ public ContextMenu CreateContextMenuForCommitMessages()
                     item.Icon = App.CreateMenuIcon("Icons.Code");
                     item.Click += (_, e) =>
                     {
-                        CommitMessage = template.Apply(_staged);
+                        CommitMessage = template.Apply(_repo, _staged);
                         e.Handled = true;
                     };
                     menu.Items.Add(item);

src/Views/RepositoryConfigure.axaml

@@ -227,7 +227,7 @@
                   <TextBlock Margin="0,12,0,0" Text="{DynamicResource Text.Configure.CommitMessageTemplate.Content}"/>
                   <v:CommitMessageTextBox Margin="0,4,0,0" Height="100" Text="{Binding Content, Mode=TwoWay}"/>
                   <TextBlock Margin="0,2,0,0"
-                             Text="You can use ${files_num}, ${files} and ${files:N} where N is the max number of file paths to output."
+                             Text="You can use ${files_num}, ${branch_name}, ${files} and ${files:N} where N is the max number of file paths to output."
                              Foreground="{DynamicResource Brush.FG2}"
                              TextWrapping="Wrap"/>
                 </StackPanel>