It also uses color, on terminals that support it. Is shows:
Status of last command.
Memory usage of the R process.
Load average of the machine.
Package being developed using devtools, if any.
Git branch and state of the working tree if within a git tree.
prompt_fancy(expr, value, ok, visible)Evaluated expression.
Its value.
Whether the evaluation succeeded.
Whether the result is visible.
prompt_fancy() returns the prompt string.
Other example prompts:
new_prompt_powerline(),
prompt_devtools(),
prompt_git(),
prompt_mem(),
prompt_runtime(),
prompt_status()