(Added) the dry-run flag to the sync one function.

tui_rsync/cli/rsync.py

@@ -29,3 +29,8 @@ class Rsync:
         output = Popen(args, stdout=PIPE)
         response = output.communicate()
 
+    def dry_one(self, source, destination):
+        args = self.__args + ['--dry-run', source, destination]
+        output = Popen(args, stdout=PIPE)
+        response = output.communicate()
+        return response

tui_rsync/cli/sync.py

@@ -41,6 +41,10 @@ def one(
         help="[b]The label[/] is a uniq identification of a [b]source[/].",
         show_default=False
     ),
+    dry: bool = typer.Option(
+        False, "-d", "--dry-run",
+        help="The command will [b]show[/] information about what will be changed.",
+    )
 ):
     """
     [green b]Sync[/] a [yellow]source[/] with the [yellow b]label[/] and its backups.
@@ -54,7 +58,12 @@ def one(
         if not dest.path.is_exists():
             console.print(skip_error)
             continue
-        rsync.run_one(str(src.source), str(dest))
+        if dry:
+            response = rsync.dry_one(str(src.source), str(dest))
+            out, err = response
+            console.print(f"{bstr_nonan(out)} {bstr_nonan(err)}")
+        else:
+            rsync.run_one(str(src.source), str(dest))
 
 @sync.command()
 def group(
@@ -100,3 +109,6 @@ def recover(
 
     rsync = Rsync(str(src.args))
     rsync.run_one(str(dest), str(src.source))
+
+def bstr_nonan(obj):
+    return "" if obj is None else obj.decode()