JanDeDobbeleer/oh-my-posh ? reverse-engineered prompt

Build me a tool to make my command line prompt look amazing. It should be a theme engine that works across different shells — like PowerShell on Windows, Zsh on my Mac, Bash on Linux, and even inside VS Code. The most important thing is that it's fast and doesn't introduce any lag.

I want it to be highly customizable with lots of pre-made themes I can easily switch between. The themes should display useful information like the current Git branch, the folder path, and the status of the last command. It also needs to support all those cool icons and symbols you see in modern terminals, like the ones from Nerd Fonts, to give it that "powerline" style. I should be able to easily configure the themes to change colors or what information gets shown.