fix(core): strip trailing spaces and dots in template formatting to prevent WinError 3

- Clean up redundant spaces and separators when conditional tags (e.g. {year?}) are omitted.
- Strip leading and trailing spaces and dots in sanitize_filename and TemplateFormatter.
- Prevent FileNotFoundError [WinError 3] caused by trailing spaces in Windows directory paths.

unshackle/core/utilities.py

@@ -142,6 +142,7 @@ def sanitize_filename(filename: str, spacer: str = ".") -> str:
     filename = re.sub(r"[:; ]", spacer, filename)  # structural chars to (spacer)
     filename = re.sub(r"[\\*!?¿,'\"" "<>|$#~]", "", filename)  # not filename safe chars
     filename = re.sub(rf"[{spacer}]{{2,}}", spacer, filename)  # remove extra neighbouring (spacer)s
+    filename = filename.strip(" .")  # strip leading and trailing spaces and dots for OS path safety
 
     return filename
 

unshackle/core/utils/template_formatter.py

@@ -96,11 +96,13 @@ class TemplateFormatter:
             # Clean up multiple consecutive dots/separators and other artifacts
             result = re.sub(r"\.{2,}", ".", result)  # Multiple dots -> single dot
             result = re.sub(r"\s{2,}", " ", result)  # Multiple spaces -> single space
-            result = re.sub(r"-{2,}", "-", result)  # Multiple dashes -> single dash
-            result = re.sub(r"^[\.\s\-]+|[\.\s\-]+$", "", result)  # Remove leading/trailing dots, spaces, dashes
+            result = re.sub(r"(?:-\s*)+-", "-", result)  # Multiple dashes (with optional spaces) -> single dash
             result = re.sub(r"\.-", "-", result)  # Remove dots before dashes (for dot-based templates)
             result = re.sub(r"[\.\s]+\)", ")", result)  # Remove dots/spaces before closing parentheses
             result = re.sub(r"\(\s*\)", "", result)  # Remove empty parentheses (empty conditional)
+            result = re.sub(r"\s{2,}", " ", result)  # Multiple spaces after parenthesis removal -> single space
+            result = re.sub(r"(?:-\s*)+-", "-", result)  # Multiple dashes (with optional spaces) -> single dash
+            result = re.sub(r"^[\.\s\-]+|[\.\s\-]+$", "", result)  # Remove leading/trailing dots, spaces, dashes
 
             # Determine the appropriate separator based on template style
             # Count separator characters between variables (between } and {)
@@ -114,6 +116,8 @@ class TemplateFormatter:
             else:
                 result = sanitize_filename(result, spacer=".")
 
+            result = result.strip(" .")
+
             if not result or result.isspace():
                 log.warning("Template formatting resulted in empty filename, using fallback")
                 return "untitled"