Prune old backups

Fixes #145

This commit adds a function to prune (14 days) old backups.

Package Control.sublime-settings

@@ -34,6 +34,9 @@
 	// The URL to post install, upgrade and removal notices to
 	"submit_url": "https://packagecontrol.io/submit",
 
+	// Maximum days to keep backups. All older ones are removed when ST starts
+	"max_backup_age": 14,
+
 	// If missing packages should be automatically installed when ST starts
 	"install_missing": true,
 

package_control/package_cleanup.py

@@ -56,6 +56,9 @@ def run(self):
                 'version': __version__
             })
 
+        # To limit diskspace occupied remove all old enough backups
+        self.manager.prune_backup_dir()
+
         # Scan through packages and complete pending operations
         found_packages = self.cleanup_pending_packages()
 

package_control/package_manager.py

@@ -102,6 +102,7 @@ def __init__(self):
             'ignore_vcs_packages',
             'install_missing',
             'install_prereleases',
+            'max_backup_age',
             'package_destination',
             'package_name_map',
             'package_profiles',
@@ -2052,6 +2053,30 @@ def backup_package_dir(self, package_name):
             )
             return False
 
+    def prune_backup_dir(self):
+        """
+        Remove all backups older than ``max_backup_age`` days.
+        """
+
+        age = max(0, self.settings.get('max_backup_age', 14))
+        today = datetime.date.today()
+        backup_dir = os.path.join(sys_path.data_path(), 'Backup')
+
+        if not os.path.isdir(backup_dir):
+            return
+
+        for fname in os.listdir(backup_dir):
+            package_backup_dir = os.path.join(backup_dir, fname)
+            if not os.path.isdir(package_backup_dir):
+                continue
+
+            try:
+                date = datetime.date(int(fname[:4]), int(fname[4:6]), int(fname[6:8]))
+                if (today - date).days > age:
+                    delete_directory(package_backup_dir)
+            except ValueError:
+                continue
+
     def print_messages(self, package_name, package_dir, is_upgrade, old_version, new_version):
         """
         Prints out package install and upgrade messages