refactor: removes list and simplifies git default branch

Removes the list of possible default branches and put in an if else
statement. Other possible default branches must use the rev option.

peru/resources/plugins/git/git_plugin.py

@@ -165,24 +165,22 @@ def plugin_reup(url, reup):
 
 def git_default_branch(url) -> str:
     """
-    With a list of common default branches names, it checks against
-    the available branch list if this possible default branch exists.
-    By default git used to take master as default branch, but newer versions
-    tend to use main, even trunk or development can be found.
+    This function checks if the default branch is master.
+    If it is not found, then it assumes it is main.
+    For other default branches, user should use the 'rev' option.
 
     Args:
         url (str): url from the target repository to be checked.
     Returns:
         str: returns a possible match for the git default branch.
     """
     repo_path = clone_if_needed(url)
-    default_branches_list = ['master', 'main']
-    for branch in default_branches_list:
-        output = git('show-ref', '--verify', '--quiet', 'refs/heads/' + branch,
-                     git_dir=repo_path, checked=False, capture_output=True)
-        if output.returncode == 0:
-            return branch
-    return 'master'
+    output = git('show-ref', '--verify', '--quiet', 'refs/heads/master',
+                 git_dir=repo_path, checked=False, capture_output=True)
+    if output.returncode == 0:
+        return 'master'
+    else:
+        return 'main'
 
 
 def main():