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website: document format

This commit is contained in:
Mitchell Hashimoto 2015-03-02 10:27:58 -08:00
parent b39ddc7d47
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6
website/source/docs/configuration/interpolation.html.md
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@ -80,6 +80,12 @@ The supported built-in functions are:
in this file are _not_ interpolated. The contents of the file are in this file are _not_ interpolated. The contents of the file are
read as-is. read as-is.
* `format(format, args...)` - Formats a string according to the given
format. The syntax for the format is standard `sprintf` syntax.
Good documentation for the syntax can be [found here](http://golang.org/pkg/fmt/).
Example to zero-prefix a count, used commonly for naming servers:
`format("web-%03d", count.index+1)`.
* `join(delim, list)` - Joins the list with the delimiter. A list is * `join(delim, list)` - Joins the list with the delimiter. A list is
only possible with splat variables from resources with a count only possible with splat variables from resources with a count
greater than one. Example: `join(",", aws_instance.foo.*.id)` greater than one. Example: `join(",", aws_instance.foo.*.id)`