Add template function cat

[digitalcraftsman]

Cat returns the concatenated version of multiple
strings that are delimited by a separator.

[bep]

cat on Unix doesn't do this ... This looks like something we have already.

[digitalcraftsman]

This looks like something we have already.

Hugo provides a delimit function. But it requires a list of strings. Out of the box it's not possible to create a slice in Go's template language (as far as I know). Cases like this one could be handled with cat, since cat doesn't requires as slice of strings. Instead it takes the strings as single arguments.

cat on Unix doesn't do this

Usually, cat concatenates the content of files in Unix and returns them to Stdout. I treated the file's content as string (as analogy). But we can change name / description if this PR isn't rejected.

[moorereason]

Delimit can also take a map, so can you use dict on the first arg to delimit?

[digitalcraftsman]

That's a clever workaround. The following example will output the same:

{{ delimit (dict "key1" "foo" "key2" "bar") ", " }}

You can achieve this already with built-in tools but everytime you've to add a key which isn't used at all. You need to make the tradeoff between potential redundancy and (in my eyes) a more elegant use.

[moorereason]

True: the dict requires useless, unique keys.

I would rather see us add a slice template func instead of this cat proposal:

func slice(args ...interface{}) []interface{}

Use case:

{{ delimit (slice "foo" "bar") ", " }}

[digitalcraftsman]

That sounds like a good compromise. I'll close this issue and open a new one for your suggested slice function.

[digitalcraftsman]

See #1902

[github-actions]

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