From 5c8d885707348d320a95f886f5c8beb5aac9e80d Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Deuchnord?= <jerome@deuchnord.fr>
Date: Fri, 15 Nov 2019 08:30:50 +0100
Subject: [PATCH] Add --clear-cache option

---
 kosmorro            | 27 ++++++++++++++++++++++++++-
 kosmorrolib/core.py |  9 ++++++++-
 2 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/kosmorro b/kosmorro
index 224b8cb..1b68cb4 100644
--- a/kosmorro
+++ b/kosmorro
@@ -17,14 +17,21 @@
 #    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
 import argparse
+import sys
 from datetime import date
+
 from kosmorrolib import dumper
+from kosmorrolib import core
 from kosmorrolib.ephemerides import EphemeridesComputer, Position
 
 
 def main():
     output_formats = get_dumpers()
     args = get_args(list(output_formats.keys()))
+
+    if args.special_action is not None:
+        return 0 if args.special_action() else 1
+
     year = args.year
     month = args.month
     day = args.day
@@ -38,6 +45,8 @@ def main():
     dump = output_formats[args.format](ephemerides)
     print(dump.to_string())
 
+    return 0
+
 
 def get_dumpers() -> {str: dumper.Dumper}:
     return {
@@ -46,6 +55,20 @@ def get_dumpers() -> {str: dumper.Dumper}:
     }
 
 
+def clear_cache() -> bool:
+    confirm = input("Do you really want to clear Kosmorro's cache? [yN] ").upper()
+    if confirm == 'Y':
+        try:
+            core.clear_cache()
+        except FileNotFoundError:
+            pass
+    elif confirm not in ('N', ''):
+        print('Answer did not match expected options, cache not cleared.')
+        return False
+
+    return True
+
+
 def get_args(output_formats: [str]):
     today = date.today()
 
@@ -55,6 +78,8 @@ def get_args(output_formats: [str]):
                                             ' observer positioned at coordinates (0,0), with an altitude of 0.'
                                      % today.strftime('%a %b %d, %Y'))
 
+    parser.add_argument('--clear-cache', dest='special_action', action='store_const', const=clear_cache, default=None,
+                        help='Delete all the files Kosmorro stored in the cache.')
     parser.add_argument('--format', '-f', type=str, default=output_formats[0], choices=output_formats,
                         help='The format under which the information have to be output')
     parser.add_argument('--latitude', '-lat', type=float, default=0.,
@@ -77,4 +102,4 @@ def get_args(output_formats: [str]):
 
 
 if __name__ == '__main__':
-    main()
+    sys.exit(main())
diff --git a/kosmorrolib/core.py b/kosmorrolib/core.py
index cc86ce6..b7476c4 100644
--- a/kosmorrolib/core.py
+++ b/kosmorrolib/core.py
@@ -16,11 +16,14 @@
 #    You should have received a copy of the GNU Affero General Public License
 #    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 
+from shutil import rmtree
+from pathlib import Path
 from skyfield.api import Loader
 
 from .data import Star, Planet, Satellite
 
 VERSION = '0.1.1'
+CACHE_FOLDER = str(Path.home()) + '/.kosmorro-cache'
 
 MONTHS = ['JAN', 'FEB', 'MAR', 'APR', 'MAY', 'JUN', 'JUL', 'AUG', 'SEP', 'OCT', 'NOV', 'DEC']
 
@@ -37,7 +40,7 @@ ASTERS = [Star('Sun', 'SUN'),
 
 
 def get_loader():
-    return Loader('~/.kosmorro-cache')
+    return Loader(CACHE_FOLDER)
 
 
 def get_timescale():
@@ -46,3 +49,7 @@ def get_timescale():
 
 def get_skf_objects():
     return get_loader()('de421.bsp')
+
+
+def clear_cache():
+    rmtree(CACHE_FOLDER)