You might be looking for help, but this is all I can do:
usage: xo [-h] path
exofrills: your text has been edited...but you are still hungry.
positional arguments:
path path to file, may include colon separated line and col numbers,
eg 'path/to/xo.py:10:42'
optional arguments:
-h, --help show this help message and exit
esc: get help ctrl + o: save file (write-out) ctrl + x: exit (does not save)
meta + s: select pygments style ctrl + f: insert file at current position ctrl + y: go to line & column (yalla, let's bounce)
ctrl + k: cuts the current line to the clipboard ctrl + u: pastes the clipboard to the current line ctrl + t: clears the clipboard (these spell K-U-T)
ctrl + w: set regular expression and jump to first match meta + w: jump to next match of current regular expression ctrl + r: set substitution for regular expression and replace first match meta + r: replace next match of current regular expression