added cli: flask clear-cache

scodoc.py

@@ -184,3 +184,18 @@ def user_db_import_scodoc7():  # user-db-import-scodoc7
     The original SCOUSERS database is left unmodified.
     """
     utils.import_scodoc7_user_db()
+
+
+@app.cli.command()
+@with_appcontext
+def clear_cache():  # clear-cache
+    """Clear ScoDoc cache
+    This cache (currently Redis) is persistent between invocation
+    and it may be necessary to clear it during developement or tests.
+    """
+    # attaque directement redis, court-circuite ScoDoc:
+    import redis
+
+    r = redis.Redis()
+    r.flushall()
+    click.echo("Redis caches flushed.")