Weird bug navigating multiline command history in pry

Question

When I enter a string that is too long for the console width into a pry or regular irb console it wraps as usual, see below (Using pry in OS X 10.8.2 terminal.app):

However when I try to replay the command using the up arrow I get this: Pry cuts off some of the command and repeats the prompt. Irb on the other hand behaves just fine, even scrolling up the buffer if needed:

Answer 1

Kyrylo: We have that fixed in the master branch if you Pry.auto_resize!

But the problem here is (as ryanf points out on Freenode #pry), is that the prompt has color escapes in it.

\e[XXn takes up no spaces, but counts as 5 bytes, so Readline gets confused.

Does anyone know of any Ruby use of Readline that doesn't have this problem?

Answer 2

It looks like you resized your terminal window after you entered the first expression. For the time being, Pry doesn't really take into account this event and treats window size as a constant value. Unfortunately, the only solution is to relaunch Pry every time you need to resize your window. This is a bug and sooner or later it will be fixed.