Merge pull request #31 from NOAA-MDL/issue#30

Create new directory for ephemeris files where skyfield is installed.

.gitignore

@@ -10,7 +10,7 @@ __pycache__
 # Setuptools build and distribution folders
 /.cache
 /.eggs
-/.venv/
+/.gifts/
 /build/
 /dist/
 /data/

gifts/swaDecoder.py

@@ -15,7 +15,10 @@
 import re
 import time
 
+import skyfield
+
 from skyfield.api import Loader
+from skyfield.toposlib import wgs84
 
 from .common import tpg
 from .common import xmlConfig as des
@@ -109,7 +112,7 @@ def __init__(self):
         #
         # Preparing Skyfield
         try:
-            load = Loader(os.path.join(os.path.dirname(__file__), '../data'), verbose=False)
+            load = Loader(os.path.join(skyfield.__path__[0], 'bsp_files'), verbose=False)
             self._ts = load.timescale()
             #
             # Open NAIF/JPL/NASA SPICE Kernel
@@ -118,7 +121,7 @@ def __init__(self):
             self._Helios = planets['sun']
 
         except Exception:
-            self._Logger.exception('Unable to load/initialize Skyfield Module.')
+            self._Logger.exception('Unable to load/initialize Skyfield ephemeris file.')
             raise
 
         return super(Decoder, self).__init__()
@@ -264,7 +267,7 @@ def daylight(self):
         #
         # Determine solar sub-point on Earth at forecast/observed time.
         fcsttime = self._ts.utc(*self.issueTime[:5])
-        subpoint = (self._Helios - self._Gaia).at(fcsttime).subpoint()
+        subpoint = wgs84.geographic_position_of((self._Helios - self._Gaia).at(fcsttime))
         self._affected['daylight'] = '%s %s' % (round(subpoint.latitude.degrees, 2),
                                                 round(subpoint.longitude.degrees, 2))
 

setup.py

@@ -1,3 +1,32 @@
+import os
+import sys
 import setuptools
 
 setuptools.setup()
+#
+# Find skyfield module location
+try:
+    #
+    # If skyfield was installed before GIFTs
+    import skyfield
+
+    bsp_directory = os.path.join(skyfield.__path__[0], 'bsp_files')
+    if not os.path.exists(bsp_directory):
+        os.mkdir(bsp_directory)
+        os.chmod(bsp_directory, 0o777)
+
+except ModuleNotFoundError:
+    #
+    # Newly installed with GIFTs
+    site_package_dir = os.path.join(sys.prefix, 'lib', 'python{}.{}'.format(sys.version_info.major,
+                                                                            sys.version_info.minor), 'site-packages')
+    egg_ext = '-py{}.{}.egg'.format(sys.version_info.major, sys.version_info.minor)
+
+    for d in os.listdir(site_package_dir):
+        if d.startswith('skyfield') and d.endswith(egg_ext):
+            os.mkdir(os.path.join(site_package_dir, d, 'skyfield', 'bsp_files'))
+            os.chmod(os.path.join(site_package_dir, d, 'skyfield', 'bsp_files'), 0o777)
+            break
+    else:
+        print("Unable to create bsp_files directory for skyfield module. Please create it manually with user & group "
+              "write permissions")