Add expansion of params in config file

Allow using wildcards (i.e. * to match any character and ~ to match the
user's home directory) in inputs and ouput variables in config file

simple_backup/simple_backup.conf

@@ -1,14 +1,14 @@
-#Example config file for simple_backup
+# Example config file for simple_backup
 
 [default]
-#Input directories. Use a comma to separate items
+# Files and directories to backup. Multiple items can be separated using a comma (','). It is possible to use wildcards (i.e. '*' to match multiple characters and '~' for the user's home directory).
 inputs=/home/my_home,/etc
 
-#Output directory
+# Output directory.
 backup_dir=/media/Backup
 
-#Exclude patterns. Use a comma to separate items
-exclude=.gvfs,.local/share/gvfs-metadata,.cache,.dbus,.Trash,.local/share/Trash,.macromedia,.adobe,.recently-used,.recently-used.xbel,.thumbnails
+# Files, directories and patterns to exclude from the backup. Multiple items can be separated using a comma.
+exclude=*.bak
 
-#Number of snapshots to keep (use -1 to keep all)
-keep=-1
+# Number of old backups (i.e. excluding the one that's being created) to keep (use -1 to keep all)
+keep=-1

simple_backup/simple_backup.py

@@ -12,8 +12,11 @@ from timeit import default_timer
 from subprocess import Popen, PIPE, STDOUT
 from datetime import datetime
 from tempfile import mkstemp
+from glob import glob
+
 from dotenv import load_dotenv
 
+
 try:
     from systemd import journal
 except ImportError:
@@ -32,6 +35,7 @@ if euid == 0:
     user = os.getenv('SUDO_USER')
     homedir = os.path.expanduser(f'~{user}')
 else:
+    user = os.getenv('USER')
     homedir = os.getenv('HOME')
 
 logging.getLogger().setLevel(logging.DEBUG)
@@ -259,6 +263,20 @@ def _parse_arguments():
     return args
 
 
+def _expand_inputs(inputs):
+    expanded_inputs = []
+
+    for i in inputs:
+        i_ex = glob(os.path.expanduser(i.replace('~', f'~{user}')))
+
+        if len(i_ex) == 0:
+            logger.warning(f'No file or directory matching input {i}. Skipping...')
+        else:
+            expanded_inputs.extend(glob(os.path.expanduser(i.replace('~', f'~{user}'))))
+
+    return expanded_inputs
+
+
 def _read_config(config_file):
     if not os.path.isfile(config_file):
         logger.warning(f'Config file {config_file} does not exist')
@@ -270,7 +288,10 @@ def _read_config(config_file):
 
     inputs = config.get('default', 'inputs')
     inputs = inputs.split(',')
+    inputs = _expand_inputs(inputs)
+    inputs = list(set(inputs))
     output = config.get('default', 'backup_dir')
+    output = os.path.expanduser(output.replace('~', f'~{user}'))
     exclude = config.get('default', 'exclude')
     exclude = exclude.split(',')
     keep = config.getint('default', 'keep')