main : Use pathlib instead of os.path

Removes every use of os.path and replaces it with the equivalent pathlib
method.
Allows to avoid importing os.

.gitignore

@@ -1,2 +1,3 @@
 poetry.lock
 __pycache__
+docs/build

src/unisync/defaults.py

@@ -15,4 +15,4 @@ DEFAULT_SERVER_PORT: int = 22
 DEFAULT_ROOTS_LOCAL: str = str(Path("~/files").expanduser())
 # DEFAULT_ROOTS_REMOTE: str = ""
 
-DEFAULT_MISC_CACHE_DIR_PATH: Path = Path("~/.unisync").expanduser()
+DEFAULT_MISC_CACHE_DIR_PATH: str = "~/.unisync"

src/unisync/main.py

@@ -1,7 +1,6 @@
 # Copyright (C) 2025-2026 Paul Retourné
 # SPDX-License-Identifier: GPL-3.0-or-later
 
-import os
 from pathlib import Path
 
 from unisync.argparser import create_argparser
@@ -14,15 +13,15 @@ def main():
     parser = create_argparser(unisync_sync, unisync_add, unisync_mount)
     cli_args = parser.parse_args()
 
-    config_path = os.path.expanduser("~/.config/unisync/config.ini")
+    config_path: Path = Path("~/.config/unisync/config.ini").expanduser()
     # Check if --config is set
-    if cli_args.config != None and os.path.isfile(cli_args.config):
+    if cli_args.config != None and Path(cli_args.config).is_file():
         config = load_config(cli_args.config)
-    elif os.path.isfile(config_path):
-        config = load_config(config_path)
+    elif config_path.is_file():
+        config = load_config(str(config_path))
     else:
         # TODO replace the next line with something to do if no config file is found
-        config = load_config(config_path)
+        config = load_config(str(config_path))
         pass
 
     # TODO make the command line arguments work and override the config options

src/unisync/synchroniser.py

@@ -1,6 +1,12 @@
 # Copyright (C) 2025-2026 Paul Retourné
 # SPDX-License-Identifier: GPL-3.0-or-later
 
+"""Exports the Synchroniser class.
+
+This class is used to perform all the actions that require a connection to
+the remote.
+"""
+
 import subprocess
 import os
 import sys
@@ -14,9 +20,37 @@ from unisync.errors import RemoteMountedError, InvalidMountError
 logger = logging.getLogger(__name__)
 
 class Synchroniser:
+    """Synchroniser used to synchronise with a server.
+
+    It is used to perform every action needing a connection to the remote.
+    Create an ssh connection.
+    Perform the various synchronisation steps (files, links).
+    Update the links on the remote.
+    Mount the remote directory.
+    Close the ssh connection.
+
+    Attributes:
+        remote: The directory to synchronise to on the remote.
+        local: The directory to synchronise from locally.
+        user: The user on the remote server.
+        ip: The ip of the remote server.
+        port: The ssh port on the remote.
+        args_bool:
+            A list of boolean arguments for unison.
+            They will be passed directly to unison when calling it.
+            For example : auto will be passed as -auto
+        args_value:
+            Same as args_bool but for key value arguments.
+            Will be passed to unison as "-key value".
+        ssh_settings:
+            Settings to pass to the underlying ssh connection.
+            Currently unused.
+    """
 
     def __init__(self, remote:str, local:str, user:str, ip:str,
                  port:int=22, args_bool:list=[], args_value:dict={}, ssh_settings:dict={}):
+        """Initialises an instance of Synchroniser.
+        """
         self.remote_dir:str = remote
         self.local:str = local
         self.args_bool:list[str] = args_bool 
@@ -27,14 +61,21 @@ class Synchroniser:
         self.remote_port:int = port
     
     def create_ssh_master_connection(self, control_path:str="~/.ssh/control_%C", connection_timeout:int=60) -> int:
-        """
-        Creates an ssh master connection so the user only has to authenticate once to the remote server.
-        The subsequent connections will be made through this master connection which speeds up connecting.
-        @control_path: Set the location of the ssh control socket
-        @connection_timeout:
+        """Creates an ssh master connection.
+
+        It is used so the user only has to authenticate once to the remote server.
+        The subsequent connections will be made through this master connection
+        which speeds up connnection.
+        The users only have to enter their password once per synchronisation.
+
+        Args:
+            control_path: Set the location of the ssh control socket
+            connection_timeout:
                 Time given to the user to authenticate to the remote server.
                 On slow connections one might want to increase this.
-        Returns 0 on success.
+        Returns:
+            An error code (0 success, 1 TimeoutExpired, 2 KeyboardInterrupt).
+            TODO change that to raising the exception.
         """
         self.control_path = os.path.expanduser(control_path)
         command = [
@@ -61,8 +102,10 @@ class Synchroniser:
 
 
     def close_ssh_master_connection(self) -> int:
-        """
-        Close the ssh master connection.
+        """Closes the ssh master connection.
+
+        Returns:
+            The return code of the ssh call.
         """
         command = [
                 "/usr/bin/ssh",
@@ -75,8 +118,14 @@ class Synchroniser:
         return close.wait()
 
     def sync_files(self, paths:list, force:bool=False) -> int:
-        """
-        Synchronises the files.
+        """Synchronises the files.
+
+        Args:
+            paths: List of paths to synchronise.
+            force: Force the changes from remote to local.
+
+        Returns:
+            The return code of sync.
         """
         return self.sync(
                 f"ssh://{self.remote_user}@{self.remote_ip}/{self.remote_dir}/.data",
@@ -86,8 +135,13 @@ class Synchroniser:
                 )
 
     def sync_links(self, ignore:list) -> int:
-        """
-        Synchronises the links, they must exist already.
+        """Synchronises the links, they must exist already.
+
+        Args:
+            ignore: List of paths to ignore.
+
+        Returns:
+            The return code of sync.
         """
         return self.sync(
                 f"ssh://{self.remote_user}@{self.remote_ip}/{self.remote_dir}/links",
@@ -97,17 +151,20 @@ class Synchroniser:
 
     def sync(self, remote_root:str, local_root:str,
              paths:list=[], ignore:list=[], force:bool=False) -> int:
-        """
-        Perform the synchronisation by calling unison.
-        @remote_root: The remote root, must be a full root usable by unison.
-        @local_root: The local root, must be a full root usable by unison.
-        @paths: List of paths to synchronise
-        @ignore: List of paths to ignore
+        """Performs the synchronisation by calling unison.
+
+        Args:
+            remote_root: The remote root, must be a full root usable by unison.
+            local_root: The local root, must be a full root usable by unison.
+            paths: List of paths to synchronise
+            ignore: List of paths to ignore
                 The paths and everything under them will be ignored.
                 If you need to ignore some specific files use the arguments.
-        @force: Force all changes from remote to local.
+            force: Force all changes from remote to local.
                 Used mostly when replacing a link by the file.
-        Returns: the unison return code see section 6.11 of the documentation
+
+        Returns:
+            the unison return code see section 6.11 of the documentation
         """
         command = [ "/usr/bin/unison", "-root", remote_root, "-root", local_root ]
         for arg in self.args_bool:
@@ -140,12 +197,13 @@ class Synchroniser:
         return ret_code
 
     def update_links(self, background:bool=True):
-        """
-        Update the links on the remote.
+        """Updates the links on the remote.
+
         First calls cleanlinks to remove deadlinks and empty directories.
         Then calls lndir to create the new links.
+
         Args:
-        - background: controls if the update is done in the background or waited for
+            background: controls if the update is done in the background or waited for.
         """
 
         link_update_script = (f"cd {self.remote_dir}/links && "
@@ -173,13 +231,14 @@ class Synchroniser:
             print("Done")
 
     def mount_remote_dir(self):
-        """
-        Mount the remote directory to make the local links work.
-        This is achieved using sshfs.
-        Raise:
-        - RemoteMountedError: The .data directory is already a mount point
-        - InvalidMountError: .data is either not a directory or not empty
-        - subprocess.CalledProcessError: An error occured with sshfs
+        """Mounts the remote directory to make the local links work.
+
+        This is achieved using sshfs which may fail.
+
+        Raises:
+            RemoteMountedError: The .data directory is already a mount point.
+            InvalidMountError: .data is either not a directory or not empty.
+            subprocess.CalledProcessError: An error occured with sshfs.
         """
         # Get the absolute path to the correct .data directory resolving symlinks
         path_to_mount:Path = Path(f"{self.local}/../.data").resolve()