heredoc with variable interpolation breaks script

[Oliver Heins]

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.5 (GNU/Linux)

iD8DBQFFBSjzDwe2dZoA2CcRAkiQAJ4uISXVND5lZYkcDvUz580zS4RA1wCePrsD
dpoCV+C+nWX8DWkWdEFGeD8=
=H75A
-----END PGP SIGNATURE-----

 

[Logan Capaldo]

I have a somewhat weird problem: Since a few days (I recognized
yesterday) a script ceased to work which did perfectly before. I
stripped it down to a heredoc with string interpolation, which now
breaks the script. Here's a minimal example:



#!/usr/bin/ruby

var1 = "test"
var2 = <<EOF
let us look #{test}
EOF
puts var2

You are calling the method "test" (which is a perlism, FYI) inside your
HEREDOC. I'm pretty sure this was just a typo, and you meant to say
#{var1}, not #{test}.

Running this script, I get the following error:

,----
| olli@athene:~/tmp$ ./test.rb
| ./test.rb:5:in `test': wrong number of arguments (ArgumentError)
| from ./test.rb:5
| olli@athene:~/tmp$ ruby --version
| ruby 1.8.4 (2005-12-24) [i486-linux]
`----

I'm using ruby on a Debian unstable system.

TIA,
olli

 

[Oliver Heins]

You are calling the method "test" (which is a perlism, FYI) inside your
HEREDOC. I'm pretty sure this was just a typo, and you meant to say
#{var1}, not #{test}.

Indeed, it was a typo. The real error was that I did a chomp on an
undefined array-entry. I create the array key on the fly and was just
presuming that the source I was parsing contained the specific entry.
As the source changed, my script failed. I now initialize the array
keys with an empty string and everything works fine.

Thanks for the hint.
olli