Feature Request: gsub

[ctro]

I've run into a couple situations where I need to format an output string from resourceA as an input to resourceB.

As an example, suppose you want to create an aws_route53_record. The name of the record needs to be built from the public_ip of the attached node.
If the public_ip is "12.34.56.78", the record's name has to be "foo-12-34-56-78".

resource "aws_route53_record" "foo" {
zone_id = "${var.some_zone_id}"
name = ???  # "foo-${gsub('.', '-', aws_eip.foo.public_ip }"
type = "A"
ttl = "300"
records = ["${aws_eip.foo.public_ip}"]
}

The only way I can think to do this now is to write a local-exec provisioner that does string manipulation, writes a json file, and shells out to awscli. Which isn't pretty.

[pmoust]

since adccaad

name = "foo-${join("-", ${split(".",${aws_eip.foo.public_ip})})}"

But yeah, gsub would be welcomed I guess.

[mitchellh]

@pmoust Not exactly correct, but close: name = "foo-${join("-", split(".", aws_eip.foo.public_ip))}"

And this is a decent idea.

[pmoust]

👍

[mwitkow]

This would be ridiculously useful in interpolation of files.

[mitchellh]

Done, see PR above for docs as well.

[ghost]

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