I am learning C and Xlib, and this is my first project with xlib: xmenu.

It is a small utility that receives a menu specification in stdin, shows a menu where you can select one of the options, and outputs the option selected to stdout.

It receives as input a menu specification where each line is a menu entry.
Each line can be indented with tabs to represent nested menus.
Each line is made out of a label and a command separated by tab.
When you select an entry in the menu, the corresponding command is output to the stdout.
It becomes clearer by trying it.

I need some help with xlib, though, if someone here understand it, I will appreciate some help.

EDIT: I updated the program, here is how it looks now: