Vim expand

:h expand

Say the current directory is /Users/dhruvthakur/projects/6006 and path of the file open is docs/index.md

• expand('%:t') = index.md
• expand('%:r') = docs/index
• expand('%:p') = /Users/dhruvthakur/projects/6006/docs/index.md
• expand('%:p:h') = /Users/dhruvthakur/projects/6006/docs
• expand('%:h') = docs
• expand('%:t:r') = index
• expand('%:e') = md

Use these from neovim's APIs as: vim.fn.expand('%:t')