remove gs as install requires. related to pyexcel/pyexcel#105

Author: chfw

setup.py

@@ -66,11 +66,15 @@
     'xlsx': ['pyexcel-xlsx>=0.4.0'],
     'ods': ['pyexcel-ods3>=0.4.0'],
 }
+# You do not need to read beyond this line
 PUBLISH_COMMAND = '{0} setup.py sdist bdist_wheel upload -r pypi'.format(
     sys.executable)
 GS_COMMAND = ('gs django-excel v0.0.9 ' +
               "Find 0.0.9 in changelog for more details")
-here = os.path.abspath(os.path.dirname(__file__))
+NO_GS_MESSAGE = ('Automatic github release is disabled. ' +
+                 'Please install gease to enable it.')
+UPLOAD_FAILED_MSG = ('Upload failed. please run "%s" yourself.')
+HERE = os.path.abspath(os.path.dirname(__file__))
 
 
 class PublishCommand(Command):
@@ -93,17 +97,36 @@ def finalize_options(self):
     def run(self):
         try:
             self.status('Removing previous builds...')
-            rmtree(os.path.join(here, 'dist'))
+            rmtree(os.path.join(HERE, 'dist'))
         except OSError:
             pass
 
         self.status('Building Source and Wheel (universal) distribution...')
-        if os.system(GS_COMMAND) == 0:
-            os.system(PUBLISH_COMMAND)
+        run_status = True
+        if has_gease():
+            run_status = os.system(GS_COMMAND) == 0
+        else:
+            self.status(NO_GS_MESSAGE)
+        if run_status:
+            if os.system(PUBLISH_COMMAND) != 0:
+                self.status(UPLOAD_FAILED_MSG % PUBLISH_COMMAND)
 
         sys.exit()
 
 
+def has_gease():
+    """
+    test if github release command is installed
+
+    visit http://github.com/moremoban/gease for more info
+    """
+    try:
+        import gease  # noqa
+        return True
+    except ImportError:
+        return False
+
+
 def read_files(*files):
     """Read files into setup"""
     text = ""
@@ -164,7 +187,6 @@ def filter_out_test_code(file_handle):
         include_package_data=True,
         zip_safe=False,
         classifiers=CLASSIFIERS,
-        setup_requires=['gease'],
         cmdclass={
             'publish': PublishCommand,
         }