Merge pull request #47 from DavidCEllis/clear_cache_option

Add command to purge caches

Author: DavidCEllis

src/ducktools/pythonfinder/__main__.py

@@ -28,6 +28,7 @@
 
 from ducktools.lazyimporter import LazyImporter, ModuleImport, FromImport
 from ducktools.pythonfinder import list_python_installs, __version__
+from ducktools.pythonfinder.shared import purge_caches
 
 _laz = LazyImporter(
     [
@@ -122,6 +123,11 @@ def get_parser():
 
     subparsers = parser.add_subparsers(dest="command", required=False)
 
+    clear_cache = subparsers.add_parser(
+        "clear-cache",
+        help="Clear the cache of Python install details"
+    )
+
     online = subparsers.add_parser(
         "online",
         help="Get links to binaries from python.org"
@@ -305,7 +311,9 @@ def main():
         parser = get_parser()
         vals = parser.parse_args(sys.argv[1:])
 
-        if vals.command == "online":
+        if vals.command == "clear-cache":
+            purge_caches()
+        elif vals.command == "online":
             system = vals.system if vals.system else _laz.platform.system()
             machine = vals.machine if vals.machine else _laz.platform.machine()
             try:

src/ducktools/pythonfinder/shared.py

@@ -39,6 +39,7 @@
         ModuleImport("json"),
         ModuleImport("platform"),
         ModuleImport("re"),
+        ModuleImport("shutil"),
         ModuleImport("subprocess"),
         ModuleImport("tempfile"),
         ModuleImport("zipfile"),
@@ -84,6 +85,10 @@
 INSTALLER_CACHE_PATH = os.path.join(CACHE_FOLDER, "installer_details.json")
 
 
+def purge_caches(cache_folder=CACHE_FOLDER):
+    _laz.shutil.rmtree(cache_folder, ignore_errors=True)
+
+
 def version_str_to_tuple(version):
     parsed_version = _laz.re.fullmatch(FULL_PY_VER_RE, version)