[PROJECT.py] add option 'clean'

Adds the cmdline option clean (to clean the export folder) and some
minor things (spelling and option order).

workspace_tools/project.py

@@ -3,7 +3,8 @@ from os.path import join, abspath, dirname, exists
 ROOT = abspath(join(dirname(__file__), ".."))
 sys.path.insert(0, ROOT)
 
-from shutil import move
+from shutil import move, rmtree
+from os.path import join, exists, basename
 from optparse import OptionParser
 
 from workspace_tools.paths import EXPORT_DIR, EXPORT_WORKSPACE, EXPORT_TMP
@@ -30,20 +31,23 @@ if __name__ == '__main__':
     parser.add_option("-m", "--mcu", metavar="MCU", default='LPC1768',
         help="generate project for the given MCU (%s)" % ', '.join(targetnames))
 
+    parser.add_option("-i", dest="ide", default='uvision',
+        help="The target IDE: %s" % str(toolchainlist))
+
+    parser.add_option("-c", "--clean", action="store_true", default=False,
+        help="clean the export directory")
+
     parser.add_option("-p", type="int", dest="program",
         help="The index of the desired test program: [0-%d]" % (len(TESTS)-1))
 
     parser.add_option("-n", dest="program_name",
         help="The name of the desired test program")
 
-    parser.add_option("-i", dest="ide", default='uvision',
-        help="The target IDE: %s" % str(toolchainlist))
-
     parser.add_option("-b", dest="build", action="store_true", default=False,
-        help="Use the mbed library build, instead of the sources")
+        help="use the mbed library build, instead of the sources")
 
     parser.add_option("-L", "--list-tests", action="store_true", dest="list_tests", default=False, 
-        help="List available tests in order and exit")
+        help="list available programs in order and exit")
 
     (options, args) = parser.parse_args()
 
@@ -52,6 +56,13 @@ if __name__ == '__main__':
     if options.list_tests is True:
         print '\n'.join(map(str, sorted(TEST_MAP.values())))
         sys.exit()
+        
+    # Clean Export Directory
+    if options.clean:
+        if exists(EXPORT_DIR):
+            rmtree(EXPORT_DIR)
+        sys.exit()
+
 
     # Target
     if options.mcu is None :
@@ -99,7 +110,7 @@ if __name__ == '__main__':
             test.dependencies.remove(MBED_LIBRARIES)
             test.dependencies.append(MBED_BASE)
 
-    # Build the projectwith the same directory structure of the mbed online IDE
+    # Build the project with the same directory structure of the mbed online IDE
     project_dir = join(EXPORT_WORKSPACE, test.id)
     setup_user_prj(project_dir, test.source_dir, test.dependencies)