From f33580bebc3c106e487c76c1029accd26bb3986a Mon Sep 17 00:00:00 2001
From: Raphael Roberts <raphael.roberts48@gmail.com>
Date: Tue, 25 May 2021 23:29:21 -0500
Subject: [PATCH] Added backup path-name generation.

---
 openwrt_backup/utils.py | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/openwrt_backup/utils.py b/openwrt_backup/utils.py
index ace94d7..203de94 100755
--- a/openwrt_backup/utils.py
+++ b/openwrt_backup/utils.py
@@ -1,3 +1,4 @@
+import datetime
 from pathlib import Path
 from subprocess import list2cmdline
 from typing import Union
@@ -52,3 +53,21 @@ def exec_remote(client: paramiko.SSHClient, command: Union[str, list]):
         command = list2cmdline(command)
     stdin, stdout, stderr = client.exec_command(command)
     return stdout, stderr
+
+
+def get_next_number(backup_path: Path, hostname):
+    f_names = (path.name for path in backup_path.glob("*.tar.gz"))
+    f_names_fields = map(lambda s: s.split("__"), f_names)
+    f_names_fields_filtered = filter(
+        lambda fields: fields[1] == hostname, f_names_fields
+    )
+    try:
+        return max(int(fields[0]) for fields in f_names_fields_filtered) + 1
+    except ValueError:
+        return 0
+
+
+def get_new_backup_filepath(backup_path: Path, time_format, hostname):
+    next_number = get_next_number(backup_path, hostname)
+    dt = datetime.datetime.today()
+    return backup_path / f"{next_number}__{hostname}__{dt.strftime(time_format)}.tar.gz"