Add an option for the version

Author: Jonathan Como

setup.py

@@ -3,6 +3,8 @@
 from setuptools import setup, find_packages
 from setuptools.command.test import test as TestCommand
 
+from snake.version import VERSION
+
 
 class Tox(TestCommand):
     user_options = [('tox-args=', 'a', "Arguments to pass to tox")]
@@ -31,7 +33,7 @@ def run_tests(self):
 
 setup(
     name = 'snaketool',
-    version = '0.1.0',
+    version = VERSION,
     description = "An easy to use build script utility",
     url = 'https://github.com/jcomo/snake',
     author = 'Jonathan Como',

snake/application.py

@@ -7,6 +7,7 @@
 from .parser import ApplicationArgsParser as parser
 from .shell import ShellWrapper
 from .tasks import TaskRegistry, NoSuchTaskException
+from .version import VERSION
 
 
 class Application(object):
@@ -23,6 +24,9 @@ def error(self, message):
 
     def run(self):
         tasks, args, opts = parser.parse(argv[1:])
+        if opts.version:
+            self.info('snake, version %s' % VERSION)
+            return
 
         try:
             self._run(tasks, args, opts)

snake/parser.py

@@ -1,12 +1,14 @@
 from optparse import OptionParser
 
 flags_parser = OptionParser()
-flags_parser.add_option('-T', '--tasks', dest='show_tasks', action='store_true',
-                        help="Display the tasks with descriptions and exits")
-flags_parser.add_option('-t', '--trace', dest='trace', action='store_true',
-                        help="Turn on verbose backtraces")
 flags_parser.add_option('-f', '--snakefile', dest='filename', metavar='FILE',
                         help="Use FILE as the Snakefile")
+flags_parser.add_option('-t', '--trace', dest='trace', action='store_true',
+                        help="Turn on verbose backtraces")
+flags_parser.add_option('-T', '--tasks', dest='show_tasks', action='store_true',
+                        help="Display the tasks with descriptions and exit")
+flags_parser.add_option('--version', dest='version', action='store_true',
+                        help="Display the version information and exit")
 
 
 class ApplicationArgsParser(object):

snake/version.py

@@ -0,0 +1 @@
+VERSION = '0.1.1'

tests/snake_tests.py

@@ -2,6 +2,13 @@
 
 
 class SnakeTests(IntegrationTest):
+    def test_it_reports_version_information(self):
+        result = self.execute('snake --version')
+
+        self.assertStderrEmpty(result)
+        self.assertStdoutMatches(result, r'^snake, version \d+\.\d+\.\d+$')
+        self.assertStatusEqual(result, 0)
+
     def test_it_exits_with_error_when_no_snakefile_found(self):
         result = self.execute('snake')