diff --git a/tildewiki/main.py b/tildewiki/main.py
index a5792b0..65ece55 100644
--- a/tildewiki/main.py
+++ b/tildewiki/main.py
@@ -7,6 +7,7 @@ from os.path import join as path_join
 
 import click
 import pygit2
+from click import ClickException
 from click.types import Path
 
 # TODO support reading from env
@@ -16,7 +17,7 @@ PREVIEW_PATH = expanduser('~/public_html/wiki')
 LOCAL_REPOSITORY_PATH = expanduser('~/wiki')
 REPOSITORY_PATH = '/wiki'
 
-PATH_TYPE_KWARGS = dict(
+DEFAULT_PATH_KWARGS = dict(
     exists=True,
     writable=True,
     readable=True,
@@ -63,45 +64,71 @@ pass_config = click.make_pass_decorator(Config, ensure=True)
 @click.option('--publish-path',
               default=PUBLISH_PATH,
               help='System level path to wiki for publishing.',
-              type=Path(**PATH_TYPE_KWARGS))
-@click.option('--preview-path',
-              default=PREVIEW_PATH,
-              help='Local path to wiki for previewing.',
-              type=Path(**PATH_TYPE_KWARGS))
-@click.option('--local-repo-path',
-              default=LOCAL_REPOSITORY_PATH,
-              help='Path to shared wiki git repository.',
-              type=WikiRepo(**PATH_TYPE_KWARGS))
+              type=Path(**DEFAULT_PATH_KWARGS))
 @click.option('--repo-path',
               default=REPOSITORY_PATH,
               help='Path to your clone of the shared git repository.',
-              type=WikiRepo(**PATH_TYPE_KWARGS))
+              type=WikiRepo(**DEFAULT_PATH_KWARGS))
 @pass_config
-def main(config, site_name, publish_path, preview_path,
-         local_repo_path, repo_path):
+def main(config, site_name, publish_path, repo_path):
     # TODO click does not appear to call expanduser on things. it'd be nice to
     # opt into that with the Path type. Should click be patched? Or should we
     # use a custom Path type?
     config.site_name = site_name
     config.publish_path = publish_path
-    config.preview_path = preview_path
-    config.local_repo_path = local_repo_path
     config.repo_path = repo_path
 
 @main.command()
+@click.option('--local-repo-path',
+              default=LOCAL_REPOSITORY_PATH,
+              help='Path to shared wiki git repository.',
+              type=Path(file_okay=False))
+@click.option('--preview-path',
+              default=PREVIEW_PATH,
+              help='Local path to wiki for previewing.',
+              type=Path(file_okay=False))
 @pass_config
-def init(config):
+def init(config, local_repo_path, preview_path):
+    """
+    This command, `wiki init`, does the following:
+      - clones REPOSITORY_PATH to LOCAL_REPOSITORY_PATH
+      - creates PREVIEW_PATH
+      - calls the preview command
+    """
+    if path_exists(path_join(local_repo_path)):
+        raise ClickException(
+            '{} already exists. Have you already run wiki init?'.format(
+                local_repo_path))
+
+    if path_exists(path_join(preview_path)):
+        raise ClickException(
+            '{} already exists. Have you already run wiki init?'.format(
+                preview_path))
+    pygit2.clone_repository(
+        config.repo_path,
+        local_repo_path
+    )
+
+@main.command()
+@click.option('--local-repo-path',
+              default=LOCAL_REPOSITORY_PATH,
+              help='Path to shared wiki git repository.',
+              type=WikiRepo(**DEFAULT_PATH_KWARGS))
+@click.option('--preview-path',
+              default=PREVIEW_PATH,
+              help='Local path to wiki for previewing.',
+              type=Path(**DEFAULT_PATH_KWARGS))
+@pass_config
+def preview(config, local_repo_path):
     raise NotImplementedError()
 
 @main.command()
+@click.option('--local-repo-path',
+              default=LOCAL_REPOSITORY_PATH,
+              help='Path to shared wiki git repository.',
+              type=WikiRepo(**DEFAULT_PATH_KWARGS))
 @pass_config
-def preview(config):
-    click.echo('SUP')
-    raise NotImplementedError()
-
-@main.command()
-@pass_config
-def publish(config):
+def publish(config, local_repo_path):
     raise NotImplementedError()
 
 @main.command()
@@ -110,6 +137,10 @@ def get(config):
     raise NotImplementedError()
 
 @main.command()
+@click.option('--local-repo-path',
+              default=LOCAL_REPOSITORY_PATH,
+              help='Path to shared wiki git repository.',
+              type=WikiRepo(**DEFAULT_PATH_KWARGS))
 @pass_config
-def reset(config):
+def reset(config, local_repo_path):
     raise NotImplementedError()