rainbow-bash-prompt makes your bash prompt rainbow by using dosentmatter/lolcat.

If you are looking for a rainbow prompt for zsh, check out dosentmatter/rainbow-zsh-prompt

Tested on macOS Sierra (Terminal and iTerm2) and Ubuntu (GNOME Terminal)

1. bash must be compiled with readline.
2. Install C implementation of dosentmatter/lolcat for speed.
   • That is a fork of jaseg/lolcat with a minor change to make the colors pseudo random.
   • Put the binary in your $PATH and name it lolcat-c
3. copy .bash_prompt to your $HOME directory
4. Add this to your .bashrc:

if [[ -f ~/.bash_prompt ]]; then
  . ~/.bash_prompt
fi

• You can turn on and off debugging by setting PS1_DEBUG to 'true' or 'false'. Debugging is used to show the non-printing characters and highlight them. It has a line wrap issue as shown in the asciinema recording above that seems to be caused by colored prompts that are too long. This is not an issue because it is only meant for debugging.
• You can change the command used to colorize PS1 by setting PS1_COLORIZE_COMMAND to a name of a function.
  • Currently, it is set to '__ps1_lolcat' which uses lolcat-c for speed.
  • If you have rbenv with ruby busyloop/lolcat or pyenv with python tehmaze/lolcat installed, you can set PS1_COLORIZE_COMMAND to '__ps1_lolcat_ruby' or '__ps1_lolcat_python'
• You can change the command used to format the debug output by setting PS1_DEBUG_COMMAND to a name of a function.
  • Currently, it is set to __ps1_debug which displays non-printing characters and colors them.

To have double quotes " and backslashes \ work in both regular and debug mode, PS1 has to have \\" and \\\\ respectively to have the right number of escapes for both modes.