command.rb in git-utils-2.2.0

- old
+ new

@@ -24,10 +24,31 @@
   # Returns the current Git branch.
   def current_branch
     @current_branch ||= `git rev-parse --abbrev-ref HEAD`.strip
   end
 
+  # Returns the default branch for the current repository.
+  # Command retrieved from
+  # https://stackoverflow.com/questions/28666357/git-how-to-get-default-branch
+  def default_branch
+    branch_name = `git symbolic-ref --short refs/remotes/origin/HEAD \
+                   | sed 's@^origin/@@'`.strip
+    if branch_name.empty?
+      $stderr.puts "Repository configuration error"
+      $stderr.puts "Missing reference to refs/remotes/origin/HEAD"
+      $stderr.puts "Run"
+      $stderr.puts
+      $stderr.puts "  git remote set-head origin <default branch>"
+      $stderr.puts
+      $stderr.puts "where <default branch> is the default branch name"
+      $stderr.puts "(typically `main`, `master`, or `trunk`)"
+      $stderr.puts "and then rerun the command"
+      exit(1)
+    end
+    @default_branch ||= branch_name
+  end
+
   # Returns the URL for the remote origin.
   def origin_url
     @origin_url ||= `git config --get remote.origin.url`.strip
   end
 
@@ -93,6 +114,6 @@
     end
 
     def deliver?
       options.deliver
     end
-end
\ No newline at end of file
+end