Enhance Clipper with Folder Copying, File Type/Extension Filtering, and Size Filtering (Dependent on Performance Enhancements)

[supitsdu]

Currently, Clipper only supports copying text content from files or standard input. This enhancement aims to significantly expand the tool's functionality by enabling it to copy entire files located within a specified folder. Additionally, it will provide filtering options based on file type/extension and size, giving users more granular control over what gets copied.

Prerequisites:

• Performance Enhancements: This feature relies on performance improvements, specifically, using goroutines and concurrency features for parallel file processing (Issue Explore Concurrency (goroutines and channels) for Copying from Multiple Files #23), and buffered file reading. These optimizations are essential to ensure efficient and responsive handling of potentially large numbers of files.

Proposed Features:

1. Folder Copying: Add a new flag (e.g., -d or --directory) to specify a folder path. Clipper will then copy all files within that folder to the clipboard (or a designated output location).
2. File Type/Extension Filtering: Implement flags or options to filter files based on their type or extension. For example:
   • -t text or --type text: Copy only text files.
   • -e jpg,png or --extension jpg,png: Copy only JPG and PNG images.
3. Size Filtering: Add options to filter files based on minimum and maximum size:
   • -min 10KB: Copy only files larger than or equal to 10 kilobytes.
   • -max 1MB: Copy only files smaller than or equal to 1 megabyte.

Additional Considerations:

• User Interface: Determine the best way to present these new options to the user (e.g., additional flags, subcommands).
• Clipboard Size Limitations:
  • Windows: No theoretical limit, but practical constraints due to available memory.
  • macOS: No specific limit documented, but large amounts of data may impact performance.
  • Linux (X11): Clipboard managers may have configurable size limits. Investigate using the xclip utility or other clipboard libraries to handle potentially large amounts of file data.
• Error Handling: Implement robust error handling for invalid folder paths, incorrect filter values, out-of-memory errors, etc.
• Recursive Copying: Investigate the possibility of adding an option for recursive copying (copying files from subfolders as well).