1 files changed, 48 insertions, 0 deletions
diff --git a/vicn/core/command_helpers.py b/vicn/core/command_helpers.py
new file mode 100644
index 00000000..4732e7b5
--- /dev/null
+++ b/vicn/core/command_helpers.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+#
+# Copyright (c) 2017 Cisco and/or its affiliates.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at:
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+from vicn.core.commands          import Command, Commands
+
+CMD_PRINT_TO_FILE = 'echo -n "{content}" > {filename}'
+
+class CommandHelper:
+
+    @staticmethod
+    def if_cmd(cmd_condition, if_true = None, if_false = None):
+        cmd = cmd_condition
+        if if_true:
+            cmd = cmd & if_true
+        if if_false:
+            cmd = cmd | if_false
+        return cmd
+            
+    @staticmethod
+    def file_exists(filename, if_true = None, if_false = None):
+        cmd = Command('test -f {}'.format(filename))
+        return CommandHelper.if_cmd(cmd, if_true, if_false)
+
+    @staticmethod
+    def print_to_file(node, filename, content):
+        escaped_content = content.replace('{', '{{').replace('}', '}}')
+        return BashTask(self.node, CMD_PRINT_TO_FILE, 
+                {'content': escaped_content, 'filename': filename})
+
+    @staticmethod
+    def print_to_file_no_escape(filename, content):
+        return BashTask(self.node, CMD_PRINT_TO_FILE, 
+                {'content': content, 'filename': filename})