Fix #1: fabric isn't necessary to import the module, but the commands…

… now raise exceptions if fabric is not available

.gitignore

@@ -1,3 +1,4 @@
 dist/
+*.egg-info/
 MANIFEST
 *.py[oc]

cuisine_postgresql.py

@@ -1,19 +1,49 @@
-from fabric.context_managers import cd, hide, settings
-from fabric.operations import sudo
-from fabric.utils import puts
+try:
+    from fabric.context_managers import cd, hide, settings
+    from fabric.operations import sudo
+    from fabric.utils import puts
+    __fabric_available = True
+except ImportError:
+    __fabric_available = False
 
 
-__version__ = '0.1.0'
+__version__ = '0.1.1'
 __maintainer__ = u'Atamert \xd6l\xe7gen'
 __email__ = 'muhuk@muhuk.com'
+__all__ = [
+    'postgresql_database_check',
+    'postgresql_database_create',
+    'postgresql_database_ensure',
+    'postgresql_role_check',
+    'postgresql_role_create',
+    'postgresql_role_ensure',
+]
 
 
+def require_fabric(f):
+    """
+    Raises ``RuntimeError`` if the wrapped method is called but ``fabric``
+    cannot be imported for some reason.
+    """
+    global __fabric_available
+    if __fabric_available:
+        return f
+    else:
+        def _f(*args, **kwargs):
+            error_message = 'To use function "{0}", you must have ' \
+                            'fabric in the import path'.format(f.func_name)
+            raise RuntimeError(error_message)
+        return _f
+
+
+@require_fabric
 def postgresql_database_check(database_name):
     cmd = 'psql -U postgres -l | grep \'{0}  *|\''.format(database_name)
     with settings(hide('everything'), warn_only=True):
         return bool(run_as_postgres(cmd))
 
 
+@require_fabric
 def postgresql_database_create(database_name,
                                tablespace=None,
                                locale=None,
@@ -34,6 +64,7 @@ def postgresql_database_create(database_name,
     run_as_postgres(cmd)
 
 
+@require_fabric
 def postgresql_database_ensure(database_name,
                                tablespace=None,
                                locale=None,
@@ -52,12 +83,14 @@ def postgresql_database_ensure(database_name,
                                    template)
 
 
+@require_fabric
 def postgresql_role_check(username):
     cmd = 'psql -U postgres -c \'\\du\' | grep \'^  *{0}  *|\''.format(username)
     with settings(hide('everything'), warn_only=True):
         return bool(run_as_postgres(cmd))
 
 
+@require_fabric
 def postgresql_role_create(username,
                            password,
                            superuser=False,
@@ -78,6 +111,7 @@ def postgresql_role_create(username,
     run_as_postgres(cmd)
 
 
+@require_fabric
 def postgresql_role_ensure(username,
                            password,
                            superuser=False,
@@ -98,6 +132,7 @@ def postgresql_role_ensure(username,
                                login)
 
 
+@require_fabric
 def run_as_postgres(cmd):
     """
     Run given command as postgres user.