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tpl/collections: Fix handling of different interface types in Slice

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In Hugo `0.49` we improved type support in `slice`. This has an unfortunate side effect in that `resources.Concat` now expects something that can resolve to `resource.Resources`.

This worked for most situations, but when you try to `slice` different `Resource` objects, you would be getting `[]interface {}` and not `resource.Resources`. And `concat` would fail:

```bash
error calling Concat: slice []interface {} not supported in concat.
```

This commit fixes that by simplifying the type checking logic in `Slice`:

* If the first item implements the `Slicer` interface, we try that
* If the above fails or the first item does not implement `Slicer`, we just return the `[]interface {}`

Fixes #5269
This commit is contained in:
Bjørn Erik Pedersen
2018-10-02 17:35:33 +02:00
parent ce264b936c
commit 10ac2ec446
3 changed files with 89 additions and 20 deletions
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4
hugolib/resource_chain_test.go
View File

@@ -238,6 +238,10 @@ T1: Content: {{ $combined.Content }}|RelPermalink: {{ $combined.RelPermalink }}|
{{ $combinedText := . | resources.Concat "bundle/concattxt.txt" }}
T2: Content: {{ $combinedText.Content }}|{{ $combinedText.RelPermalink }}
{{ end }}
{{/* https://github.com/gohugoio/hugo/issues/5269 */}}
{{ $css := "body { color: blue; }" | resources.FromString "styles.css" }}
{{ $minified := resources.Get "css/styles1.css" | minify }}
{{ slice $css $minified | resources.Concat "bundle/mixed.css" }}
`)
}, func(b *sitesBuilder) {
b.AssertFileContent("public/index.html", `T1: Content: ABC|RelPermalink: /bundle/concat.txt|Permalink: http://example.com/bundle/concat.txt|MediaType: text/plain`)