Select first commit if there is no tags

Author: hbcarlos

jupyter_releaser/changelog.py

@@ -83,6 +83,9 @@ def get_version_entry(
     branch = branch or util.get_branch()
     since = since or util.get_latest_tag(ref or branch, since_last_stable)
 
+    if since == "" :
+        since = util.get_first_commit(ref or branch)
+
     util.log(f"Getting changes to {repo} since {since} on branch {branch}...")
 
     if until:

jupyter_releaser/util.py

@@ -280,6 +280,11 @@ def get_latest_tag(source, since_last_stable=False):
 
     return tags[0]
 
+def get_first_commit(source):
+    """Get the default 'since' value for a branch"""
+    source = source or get_branch()
+    commit = run(f"git rev-list --max-parents=0 HEAD", quiet=True)
+    return commit
 
 def retry(cmd, **kwargs):
     """Run a command with retries"""