Merge branch 'master' into refactor-logging-levels

Conflicts:
	xnt/version.py

11 files changed, 281 insertions, 352 deletions

diff --git a/xnt/basecommand.py b/xnt/basecommand.py
deleted file mode 100644
index 6433918..0000000
--- a/xnt/basecommand.py
+++ /dev/null
@@ -1,32 +0,0 @@
-#!/usr/bin/env python
-"""Basecommand class for xnt commands"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-class Command(object):
-    """Base Command Class Definition"""
-    name = None
-    usage = None
-    hidden = False
-    need_build = False
-
-    def __init__(self):
-        pass
-
-    def run(self, arguments=None):
-        """Invoke the Command"""
-        pass
diff --git a/xnt/cmdoptions.py b/xnt/cmdoptions.py
deleted file mode 100644
index 529f060..0000000
--- a/xnt/cmdoptions.py
+++ /dev/null
@@ -1,31 +0,0 @@
-#!/usr/bin/env python
-"""Xenant Options Defintion
-
-All available options for Xenant (and there actions)
-"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-import logging
-
-def __flip_verbose_flag():
-    """Turn on logging for xnt (and submodules)"""
-    logging.getLogger("xnt").setLevel(logging.INFO)
-
-OPTIONS = {
-    "-v": __flip_verbose_flag,
-}
diff --git a/xnt/commands/__init__.py b/xnt/commands/__init__.py
deleted file mode 100644
index 583558b..0000000
--- a/xnt/commands/__init__.py
+++ /dev/null
@@ -1,41 +0,0 @@
-#!/usr/bin/env python
-"""Commands Module"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from xnt.commands.help import HelpCommand
-from xnt.commands.listtargets import ListTargetsCommand
-from xnt.commands.version import VersionCommand
-from xnt.commands.target import TargetCommand
-
-COMMANDS = {
-    HelpCommand.name: HelpCommand,
-    ListTargetsCommand.name: ListTargetsCommand,
-    VersionCommand.name: VersionCommand,
-    TargetCommand.name: TargetCommand,
-}
-
-def get_summaries(ignore_hidden=True):
-    """Return a list of summaries about each command"""
-    items = []
-
-    for name, command_class in COMMANDS.items():
-        if ignore_hidden and command_class.hidden:
-            continue
-        items.append((name, command_class.summary))
-
-    return sorted(items)
diff --git a/xnt/commands/help.py b/xnt/commands/help.py
deleted file mode 100644
index 79584be..0000000
--- a/xnt/commands/help.py
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/usr/bin/env python
-"""Xnt Help Command"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from xnt.basecommand import Command
-from xnt.status_codes import SUCCESS
-
-class HelpCommand(Command):
-    """Help Command"""
-    name = 'help'
-    usage = """"""
-    summary = 'Print Usage Summary'
-    needs_build = False
-
-    def run(self, arguments=None):
-        """Invoke Help"""
-        from xnt.commands import get_summaries
-        from xnt import __version__, __license__
-        commands = get_summaries()
-        print(__version__)
-        print(__license__)
-        print("Available Commands:")
-        for name, summary in commands:
-            print(name)
-            print("\t" + summary)
-
-        return SUCCESS
diff --git a/xnt/commands/listtargets.py b/xnt/commands/listtargets.py
deleted file mode 100644
index 2885905..0000000
--- a/xnt/commands/listtargets.py
+++ /dev/null
@@ -1,56 +0,0 @@
-#!/usr/bin/env python
-"""List Targets Xnt Command"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from xnt.basecommand import Command
-from xnt.status_codes import SUCCESS, ERROR
-import logging
-
-LOGGER = logging.getLogger(__name__)
-
-class ListTargetsCommand(Command):
-    """List Targets Command"""
-    name = 'list-targets'
-    usage = """"""
-    summary = "Prints targets in build file"
-    needs_build = True
-
-    def __init__(self, build):
-        """Initialization"""
-        Command.__init__(self)
-        self.build = build
-
-    def run(self, arguments=None):
-        """Invoke ListTargets"""
-        LOGGER.debug("build is null? %s", self.build == None)
-        try:
-            for attr in dir(self.build):
-                LOGGER.debug("Attribute %s:", attr)
-                try:
-                    func = getattr(self.build, attr)
-                    if func.decorator == "target":
-                        print(attr + ":")
-                        if func.__doc__:
-                            print(func.__doc__)
-                        print("\n")
-                except AttributeError:
-                    pass
-        except AttributeError as ex:
-            LOGGER.error(ex)
-            return ERROR
-        return SUCCESS
diff --git a/xnt/commands/target.py b/xnt/commands/target.py
deleted file mode 100644
index 0520c74..0000000
--- a/xnt/commands/target.py
+++ /dev/null
@@ -1,78 +0,0 @@
-#!/usr/bin/env python
-"""(Generic) Target Xnt Command for invoking build targets"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from xnt.basecommand import Command
-from xnt.status_codes import SUCCESS, ERROR, UNKNOWN_ERROR
-import logging
-
-LOGGER = logging.getLogger("xnt")
-
-class TargetCommand(Command):
-    """Target Command"""
-    name = '<target>'
-    usage = """"""
-    summary = "Invokes target(s) in build.py"
-    needs_build = True
-
-    def __init__(self, build):
-        """Initialization"""
-        Command.__init__(self)
-        self.build = build
-
-    def run(self, targets=None, props=None): #pylint: disable-msg=W0221
-        """Invoke Target Command"""
-        if targets:
-            for target in targets:
-                error_code = self.call_target(target, props)
-                if error_code:
-                    return error_code
-            return SUCCESS
-        else:
-            return self.call_target("default", props)
-
-    def call_target(self, target_name, props):
-        """Invoke build target"""
-        def process_params(params, buildproperties=None):
-            """Parse the passed properties and append to build properties"""
-            properties = buildproperties if buildproperties is not None else {}
-            for param in params:
-                name, value = param[2:].split("=")
-                properties[name] = value
-            return properties
-        def __get_properties():
-            """Return the properties dictionary of the build module"""
-            try:
-                return getattr(self.build, "properties")
-            except AttributeError:
-                return None
-        try:
-            if props and len(props) > 0:
-                setattr(self.build,
-                        "properties",
-                        process_params(props, __get_properties()))
-            target = getattr(self.build, target_name)
-            error_code = target()
-            return error_code if error_code else 0
-        except AttributeError:
-            LOGGER.warning("There was no target: %s", target_name)
-            return ERROR
-        except Exception as ex:
-            LOGGER.error(ex)
-            return UNKNOWN_ERROR
-
diff --git a/xnt/commands/version.py b/xnt/commands/version.py
deleted file mode 100644
index 9c2e302..0000000
--- a/xnt/commands/version.py
+++ /dev/null
@@ -1,34 +0,0 @@
-#!/usr/bin/env python
-"""Version Xnt Command"""
-
-#   Xnt -- A Wrapper Build Tool
-#   Copyright (C) 2012  Kenny Ballou
-
-#   This program is free software: you can redistribute it and/or modify
-#   it under the terms of the GNU General Public License as published by
-#   the Free Software Foundation, either version 3 of the License, or
-#   (at your option) any later version.
-
-#   This program is distributed in the hope that it will be useful,
-#   but WITHOUT ANY WARRANTY; without even the implied warranty of
-#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-#   GNU General Public License for more details.
-
-#   You should have received a copy of the GNU General Public License
-#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
-
-from xnt.basecommand import Command
-from xnt.status_codes import SUCCESS
-
-class VersionCommand(Command):
-    """Version Command"""
-    name = 'version'
-    usage = """"""
-    summary = "Print Version of Xnt"
-    needs_build = False
-
-    def run(self, arguments=None):
-        """Invoke Version"""
-        from xnt import __version__
-        print(__version__)
-        return SUCCESS
diff --git a/xnt/tasks.py b/xnt/tasks.py
index 5140618..1981e9b 100644
--- a/xnt/tasks.py
+++ b/xnt/tasks.py
@@ -121,19 +121,19 @@ def log(msg="", lvl=logging.INFO):
     """Log message using tasks global logger"""
     LOGGER.log(lvl, msg)
 
-def xntcall(path, targets=None, props=None):
+def xntcall(buildfile, targets=None, props=None):
     """Invoke xnt on another build file in a different directory
 
     param: path - to the build file (including build file)
     param: targets - list of targets to execute
     param: props - dictionary of properties to pass to the build module
     """
-    import xnt.xenant
-    from xnt.commands.target import TargetCommand
+    from xnt.xenant import invoke_build, load_build
+    build = load_build(buildfile)
+    path = os.path.dirname(buildfile)
     cwd = os.getcwd()
-    command = TargetCommand(xnt.xenant.load_build(path))
     os.chdir(path)
-    error_code = command.run(targets=targets, props=props)
+    error_code = invoke_build(build, targets=targets, props=props)
     os.chdir(cwd)
     return error_code
 
diff --git a/xnt/tests/xenantargparsertests.py b/xnt/tests/xenantargparsertests.py
new file mode 100644
index 0000000..04c8d1c
--- /dev/null
+++ b/xnt/tests/xenantargparsertests.py
@@ -0,0 +1,158 @@
+#!/usr/bin/env python
+"""Xenant Arg Parser Tests"""
+
+#   Xnt -- A Wrapper Build Tool
+#   Copyright (C) 2012  Kenny Ballou
+
+#   This program is free software: you can redistribute it and/or modify
+#   it under the terms of the GNU General Public License as published by
+#   the Free Software Foundation, either version 3 of the License, or
+#   (at your option) any later version.
+
+#   This program is distributed in the hope that it will be useful,
+#   but WITHOUT ANY WARRANTY; without even the implied warranty of
+#   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#   GNU General Public License for more details.
+
+#   You should have received a copy of the GNU General Public License
+#   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+import xnt.xenant
+import unittest
+
+#pylint: disable-msg=C0103
+class XenantArgParserTests(unittest.TestCase):
+    """Test Cases for Xenant Args Parsing"""
+
+    def test_nil_args(self):
+        """Test the empty case (no arguements)"""
+        args_in = []
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_single_target(self):
+        """Test the single target case"""
+        args_in = ["my_target"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 1)
+
+    def test_verbose(self):
+        """Test verbose flag"""
+        args_in = ["-v"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertTrue(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_list_targets_short(self):
+        """Test list targets flag, short hand"""
+        args_in = ["-l"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertTrue(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_list_targets_long(self):
+        """Test list targets flag, long hand"""
+        args_in = ["--list-targets"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertTrue(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_single_verbose(self):
+        """Test the verbose single case"""
+        args_in = ["-v", "my_verbose_target"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertTrue(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 1)
+
+    def test_multi_target(self):
+        """Test the verbose single case"""
+        args_in = ["my_first_target", "my_second_target"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 2)
+
+    def test_properties_no_target(self):
+        """Test property parsing"""
+        args_in = ["-Dmyvar=myvalue"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNotNone(args["properties"])
+        self.assertEqual(len(args["properties"]), 1)
+        self.assertEqual(args["properties"][0], "myvar=myvalue")
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_more_properties(self):
+        """Test property parsing"""
+        args_in = ["-Dmyvar=myvalue", "-Dmyothervar=myothervalue"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNotNone(args["properties"])
+        self.assertEqual(len(args["properties"]), 2)
+        self.assertEqual(args["properties"][0], "myvar=myvalue")
+        self.assertEqual(args["properties"][1], "myothervar=myothervalue")
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_build_file_spec_short(self):
+        """Test build file option"""
+        args_in = ["-b", "mybuildfile.py"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNotNone(args["build-file"])
+        self.assertEqual(args["build-file"], "mybuildfile.py")
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+    def test_build_file_spec_long(self):
+        """Test build file option"""
+        args_in = ["--build-file", "mybuildfile.py"]
+        args = xnt.xenant.parse_args(args_in)
+        self.assertIsNotNone(args)
+        self.assertFalse(args["verbose"])
+        self.assertFalse(args["list-targets"])
+        self.assertIsNotNone(args["build-file"])
+        self.assertEqual(args["build-file"], "mybuildfile.py")
+        self.assertIsNone(args["properties"])
+        self.assertIsNotNone(args["targets"])
+        self.assertEqual(len(args["targets"]), 0)
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/xnt/version.py b/xnt/version.py
index 7db0124..77cf994 100644
--- a/xnt/version.py
+++ b/xnt/version.py
@@ -17,5 +17,5 @@
 #   You should have received a copy of the GNU General Public License
 #   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
-__version_info__ = (0, 5, 2, "logging_refactor", "dev")
+__version_info__ = (0, 5, 3)
 __version__ = '.'.join(list(str(i) for i in __version_info__ if True))
diff --git a/xnt/xenant.py b/xnt/xenant.py
index 10be9b9..f11f281 100644
--- a/xnt/xenant.py
+++ b/xnt/xenant.py
@@ -21,9 +21,9 @@ import os
 import sys
 import time
 import logging
-from xnt.cmdoptions import OPTIONS
-from xnt.commands import COMMANDS
-from xnt.commands.target import TargetCommand
+import argparse
+from xnt import __version__
+from xnt.status_codes import SUCCESS, ERROR, UNKNOWN_ERROR
 
 logging.basicConfig(format="%(message)s")
 LOGGER = logging.Logger(name=__name__)
@@ -33,45 +33,38 @@ LOGGER.setLevel(logging.WARNING)
 def main():
     """Xnt Entry Point"""
     start_time = time.time()
-    params = list(p for p in sys.argv[1:] if p.startswith('-D'))
-    flags = list(o for o in sys.argv[1:]
-        if o.startswith('-') and o not in params)
-    cmds = list(c for c in sys.argv[1:]
-        if c not in flags and c not in params)
-    #Loop flags and apply them
-    for flag in flags:
-        if flag in OPTIONS:
-            OPTIONS[flag]()
-        else:
-            LOGGER.debug("%s is not a vaild option", flag)
-    #run things
-    cmd_found = False
-    for cmd in cmds:
-        if cmd in COMMANDS:
-            cmd_found = True
-            if COMMANDS[cmd].needs_build:
-                command = COMMANDS[cmd](load_build())
-            else:
-                command = COMMANDS[cmd]()
-            error_code = command.run()
-    if cmd_found == False:
-        command = TargetCommand(load_build())
-        error_code = command.run(targets=cmds, props=params)
+    args = parse_args(sys.argv[1:])
+    build_file = "./build.py"
+    if args["verbose"]:
+        LOGGER.setLevel(logging.DEBUG)
+    if args["build-file"]:
+        build_file = args["build-file"]
+    if args["list-targets"]:
+        error_code = list_targets(load_build(build_file))
+    else:
+        error_code = invoke_build(load_build(build_file),
+                                  args["targets"],
+                                  args["properties"])
     elapsed_time = time.time() - start_time
     print("Execution time: %.3f", elapsed_time)
     if error_code != 0:
         LOGGER.error("Failure")
     from xnt.tasks import rm
     rm("build.pyc",
-       "__pycache__")
+       "__pycache__",
+       build_file + "c",
+       os.path.join(os.path.dirname(build_file), "__pycache__"))
     if error_code != 0:
         sys.exit(error_code)
 
-def load_build(path=""):
+def load_build(buildfile="./build.py"):
     """Load build file
 
     Load the build.py and return the resulting import
     """
+    path = os.path.dirname(buildfile)
+    build = os.path.basename(buildfile)
+    buildmodule = os.path.splitext(build)[0]
     if not path:
         path = os.getcwd()
     else:
@@ -79,18 +72,110 @@ def load_build(path=""):
     sys.path.append(path)
     cwd = os.getcwd()
     os.chdir(path)
-    if not os.path.exists("build.py"):
+    if not os.path.exists(build):
         LOGGER.error("There was no build file")
         sys.exit(1)
     try:
-        return __import__("build", fromlist=[])
+        return __import__(buildmodule, fromlist=[])
     except ImportError:
         LOGGER.error("HOW?!")
         return None
     finally:
         sys.path.remove(path)
-        del sys.modules["build"]
+        del sys.modules[buildmodule]
         os.chdir(cwd)
 
+def invoke_build(build, targets=None, props=None):
+    """Invoke Build with `targets` passing `props`"""
+    def call_target(target_name, props):
+        """Call target on build module"""
+        def process_params(params, existing_props=None):
+            """Parse and separate properties and append to build module"""
+            properties = existing_props if existing_props is not None else {}
+            for param in params:
+                name, value = param.split("=")
+                properties[name] = value
+            return properties
+        def __get_properties():
+            """Return the properties dictionary of the build module"""
+            try:
+                return getattr(build, "PROPERTIES")
+            except AttributeError:
+                LOGGER.warning("Build file specifies no properties")
+                return None
+        try:
+            if props and len(props) > 0:
+                setattr(build,
+                        "PROPERTIES",
+                        process_params(props, __get_properties()))
+            target = getattr(build, target_name)
+            error_code = target()
+            return error_code if error_code else 0
+        except AttributeError:
+            LOGGER.error("There was no target: %s", target_name)
+            return ERROR
+        except Exception as ex:
+            LOGGER.critical(ex)
+            return UNKNOWN_ERROR
+    if targets and len(targets) > 0:
+        for target in targets:
+            error_code = call_target(target, props)
+            if error_code:
+                return error_code
+        return SUCCESS
+    else:
+        return call_target("default", props)
+
+def list_targets(build):
+    """List targets (and doctstrings) of the provided build module"""
+    try:
+        for attr in dir(build):
+            try:
+                func = getattr(build, attr)
+                if func.decorator == "target":
+                    print(attr + ":")
+                    if func.__doc__:
+                        print(func.__doc__)
+                    print("")
+            except AttributeError:
+                pass
+    except AttributeError as ex:
+        LOGGER.error(ex)
+        return ERROR
+    return SUCCESS
+
+def parse_args(args_in):
+    """Parse and group arguments"""
+    parser = argparse.ArgumentParser(prog="Xnt")
+    parser.add_argument("-v", "--verbose",
+                        help="Enable verbose output",
+                        action="store_true",
+                        dest="verbose")
+    parser.add_argument(
+        "--version",
+        action="version",
+        version=__version__,
+        help="Print Xnt Version and quit")
+    parser.add_argument(
+        "-b", "--build-file",
+        dest="build-file",
+        help="""Specify a build file if different than defaut or in different
+             path""")
+    parser.add_argument("-l", "--list-targets",
+                        action="store_true",
+                        dest="list-targets",
+                        help="Print build targets")
+    # Properties Group
+    params_group = parser.add_argument_group("Properties")
+    params_group.add_argument(
+        "-D", dest="properties", action="append",
+        help="Property values to be passed to the build module")
+    target_group = parser.add_argument_group("Targets")
+
+    # Targets Group
+    target_group.add_argument("targets", nargs=argparse.REMAINDER,
+                              help="Name(s) of targets to invoke")
+    return vars(parser.parse_args(args_in))
+
 if __name__ == "__main__":
     main()