bitcraze#433: Add python imports check

appveyor.yml

@@ -12,6 +12,8 @@ build_script:
 - cmd: >-
     python setup.py build
 
+    build\exe.win32-3.6\cfclient.exe --check-imports
+
     python win32install\generate_nsis.py
 
     makensis win32install\cfclient.nsi

src/cfclient/gui.py

@@ -59,6 +59,10 @@ def main():
     parser.add_argument('--debug', '-d', nargs=1, default='info', type=str,
                         help="set debug level "
                              "[minimal, info, debug, debugfile]")
+    parser.add_argument('--check-imports', type=bool, default=False,
+                        const=True, nargs="?",
+                        help="Check python imports and exit successfully" +
+                        " (intended for CI)")
     args = parser.parse_args()
     debug = args.debug
 
@@ -133,6 +137,10 @@ def main():
             logger.info("Foundation not found. Menu will show python as "
                         "application name")
 
+    if args.check_imports:
+        logger.info("All imports successful!")
+        sys.exit(0)
+
     # Start up the main user-interface
     from .ui.main import MainUI
     from PyQt5.QtWidgets import QApplication