clean-ignore: move commands under main function

Signed-off-by: Francis Charette Migneault <[email protected]>

Author: fmigneault

contrib/filter-repo-demos/clean-ignore

@@ -18,6 +18,7 @@ near the top of git-filter-repo.
 import argparse
 import os
 import subprocess
+import sys
 try:
   import git_filter_repo as fr
 except ImportError:
@@ -65,7 +66,14 @@ class CheckIgnores:
     commit.file_changes = [x for x in commit.file_changes
                            if x.filename not in bad]
 
-checker = CheckIgnores()
-args = fr.FilteringOptions.default_options()
-filter = fr.RepoFilter(args, commit_callback=checker.skip_ignores)
-filter.run()
+
+def main():
+  checker = CheckIgnores()
+  args = fr.FilteringOptions.default_options()
+  filter = fr.RepoFilter(args, commit_callback=checker.skip_ignores)
+  filter.run()
+  
+
+if __name__ == '__main__':
+  main()
+