Pagination is supported. you can use the --per-page and --page options:

./gitlab project list --per-page 2 --page 10

No, that's not what I mean. I meant that a function 'all_projects' should list all projects (from page 1 to page n). Right now, the only way I've found to list all projects is:

for page in count(1):
    projects = gl.all_projects(page=page)
    if len(projects) == 0:
        break
    <process page here>

Is this the only way?

Sorry, I misunderstood your question.

AFAIK the gitlab API doesn't provide a method to list all the projects without pagination, so a loop is probably the only way to get what you want.