Hi, I’m new to this newsgroup, so I’m not sure if this is the right
place to ask.
Ok, so what I’m trying to do is customise the IRB prompt in a rather
complicated way: I want to print %i*2 (or even just %i) spaces at the
beginning of each line of prompt. Here was my best attempt (not sure
if there’s a better way to format this for Usenet):
if “Jim” == “Fred”
print “Ruby Sucks!”
else
print “Ruby is cool!”
end
print “And you know it!”
But obviously, It tries to work out the value of the #{ } as soon as
it’s set, not when it’s displayed, after the %i has been gsub’d for
displaying. So, I get an error thrown at me.
Does anybody know how to do this? Maybe some printf() trickery?
This is a constant so you cannot just assign it a dynamic value.
If you really want, you can assign it an instance of a class that
exposes an interface similar to that of a Hash but acts dynamically.
You’d still need to somehow get the value of “%i”, whatever that is
(I’m not familiar with IRB configuration but I know it’s very hard to
achieve this with Ruby so I just guess you meant @i or something (if
I’m wrong, sorry)).
You might as well just modify a few lines of IRB code, I guess.
By the way, printf() like formatitng in Ruby has a great syntax:
“%f” % 0.1
“%d %d” % [1, 2]
(String could be dynamic, Numerics could be dynamic, Array could be
dynamic).
Have a look at the Adopt-a-newbie thread here in the mailing list