setup.py: Better fallback when version.py doesn't exist.

Signed-off-by: Tim 'mithro' Ansell <tansell@google.com>

Author: Tim 'mithro' Ansell

setup.py

@@ -26,7 +26,11 @@
 
 # Manually import the version number so dependencies don't need to be installed
 # when running setup.py
-exec(open(path.join(__dir__, "sphinxcontrib_verilog_diagrams", "version.py")).read())
+version_file = path.join(__dir__, "sphinxcontrib_verilog_diagrams", "version.py")
+if path.exists(version_file):
+    exec(open(version_file).read())
+else:
+    __version__ = "0.0.dev0"
 
 readme_file = path.join(__dir__, 'README.md')
 try:

sphinxcontrib_verilog_diagrams/__init__.py

@@ -52,7 +52,7 @@
 try:
     from .version import __version__
 except ImportError:
-    __version__ = "unknown"
+    __version__ = "0.0.dev0"
 
 
 logger = logging.getLogger(__name__)