sidebar package

This is for the sidebar UI, and for fetching and updating sidebar directories

To-dos

• Add missing unit tests
• Separate out implementation of file I/O operations. (Disk listing, Reading and Updating pinned.json) This package should only be concerned with UI/UX.
• Implementing a proper state transitioning for the sidebar's different modes (normal, search, rename)
• Some methods could be made more pure by reducing side effects

Coverage

cd /path/to/ui/sidebar
go test -cover

Current coverage is 29.3%.