Add set-default --allow-undefined; see #210

CHANGES.md

@@ -2,6 +2,10 @@
 
 ## v2.1.0 (in progress)
 
+### New features
+- When calling `set-default`, you can now pass `--allow-undefined` to set the
+  default to a version that doesn't exist yet
+
 ### Bug fixes
 - When loading an MkDocs config, mike now runs the `startup` and `shutdown`
   events

README.md

@@ -217,6 +217,10 @@ version of the docs:
 mike set-default [identifier]
 ```
 
+Normally, this command will return an error if `identifier` doesn't exist. If
+you want to set the default to a version that doesn't exist yet, you can pass
+`--allow-undefined`.
+
 If you want to use a different template from the default, you can pass
 `-T`/`--template`; this takes a path to a [Jinja][jinja] template that accepts
 an `{{href}}` variable. (Note that this page *always* uses a redirect, no matter

mike/commands.py

@@ -272,8 +272,9 @@ def retitle(identifier, title, *, branch='gh-pages', message=None,
         commit.add_file(versions_to_file_info(all_versions, deploy_prefix))
 
 
-def set_default(identifier, template=None, *, branch='gh-pages', message=None,
-                allow_empty=False, deploy_prefix=''):
+def set_default(identifier, template=None, allow_undefined=False, *,
+                branch='gh-pages', message=None, allow_empty=False,
+                deploy_prefix=''):
     if message is None:
         message = (
             'Set default version to {doc_identifier}{deploy_prefix} with ' +
@@ -285,7 +286,7 @@ def set_default(identifier, template=None, *, branch='gh-pages', message=None,
         )
 
     all_versions = list_versions(branch, deploy_prefix)
-    if not all_versions.find(identifier):
+    if not allow_undefined and not all_versions.find(identifier):
         raise ValueError('identifier {!r} does not exist'.format(identifier))
 
     t = _redirect_template(template)

mike/driver.py

@@ -299,7 +299,8 @@ def set_default(parser, args):
     check_remote_status(args, strict=True)
     with handle_empty_commit():
         commands.set_default(args.identifier, args.template,
-                             branch=args.branch, message=args.message,
+                             args.allow_undefined, branch=args.branch,
+                             message=args.message,
                              allow_empty=args.allow_empty,
                              deploy_prefix=args.deploy_prefix)
         if args.push:
@@ -424,6 +425,9 @@ def main():
     set_default_p.set_defaults(func=set_default)
     set_default_p.add_argument('-T', '--template', complete='file',
                                help='template file to use')
+    set_default_p.add_argument('--allow-undefined', action='store_true',
+                               help=('allow setting undefined versions as ' +
+                                     'default'))
     add_git_arguments(set_default_p)
     set_default_p.add_argument('identifier', metavar='IDENTIFIER',
                                help='version or alias to set as default')

test/integration/test_set_default.py

@@ -43,6 +43,12 @@ def test_set_default(self):
         check_call_silent(['git', 'checkout', 'gh-pages'])
         self._test_default()
 
+    def test_allow_undefined(self):
+        self._deploy()
+        assertPopen(['mike', 'set-default', '2.0', '--allow-undefined'])
+        check_call_silent(['git', 'checkout', 'gh-pages'])
+        self._test_default(match_redir('2.0/'))
+
     def test_custom_template(self):
         self._deploy()
         assertPopen(['mike', 'set-default', '1.0', '-T',

test/unit/test_commands.py

@@ -752,6 +752,12 @@ def test_set_default(self):
         check_call_silent(['git', 'checkout', 'gh-pages'])
         self._test_default()
 
+    def test_allow_undefined(self):
+        self._deploy()
+        commands.set_default('2.0', allow_undefined=True)
+        check_call_silent(['git', 'checkout', 'gh-pages'])
+        self._test_default(match_redir('2.0/'))
+
     def test_custom_template(self):
         self._deploy()
         with mock.patch('builtins.open',