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https://github.com/gohugoio/hugo.git
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e27fd4c1b8
Before this commit you would typically use `.Scratch.Add` to manually create slices in a loop.
With variable overwrite in Go 1.11, we can do better. This commit adds the `append` template func.
A made-up example:
```bash
{{ $p1 := index .Site.RegularPages 0 }}{{ $p2 := index .Site.RegularPages 1 }}
{{ $pages := slice }}
{{ if true }}
{{ $pages = $pages | append $p2 $p1 }}
{{ end }}
```
Note that with 2 slices as arguments, the two examples below will give the same result:
```bash
{{ $s1 := slice "a" "b" | append (slice "c" "d") }}
{{ $s2 := slice "a" "b" | append "c" "d" }}
```
Both of the above will give `[]string{a, b, c, d}`.
This commit also improves the type handling in the `slice` template function. Now `slice "a" "b"` will give a `[]string` slice. The old behaviour was to return a `[]interface{}`.
Fixes #5190
105 lines
3.1 KiB
Go
105 lines
3.1 KiB
Go
// Copyright 2018 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package hugolib
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import (
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"fmt"
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"github.com/gohugoio/hugo/resource"
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"github.com/gohugoio/hugo/common/collections"
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)
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var (
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_ collections.Grouper = (*Page)(nil)
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_ collections.Slicer = (*Page)(nil)
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_ collections.Slicer = PageGroup{}
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_ collections.Slicer = WeightedPage{}
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_ resource.ResourcesConverter = Pages{}
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)
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// collections.Slicer implementations below. We keep these bridge implementations
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// here as it makes it easier to get an idea of "type coverage". These
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// implementations have no value on their own.
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// Slice is not meant to be used externally. It's a bridge function
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// for the template functions. See collections.Slice.
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func (p *Page) Slice(items interface{}) (interface{}, error) {
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return toPages(items)
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}
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// Slice is not meant to be used externally. It's a bridge function
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// for the template functions. See collections.Slice.
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func (p PageGroup) Slice(in interface{}) (interface{}, error) {
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switch items := in.(type) {
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case PageGroup:
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return items, nil
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case []interface{}:
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groups := make(PagesGroup, len(items))
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for i, v := range items {
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g, ok := v.(PageGroup)
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if !ok {
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return nil, fmt.Errorf("type %T is not a PageGroup", v)
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}
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groups[i] = g
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}
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return groups, nil
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default:
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return nil, fmt.Errorf("invalid slice type %T", items)
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}
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}
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// Slice is not meant to be used externally. It's a bridge function
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// for the template functions. See collections.Slice.
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func (p WeightedPage) Slice(in interface{}) (interface{}, error) {
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switch items := in.(type) {
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case WeightedPages:
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return items, nil
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case []interface{}:
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weighted := make(WeightedPages, len(items))
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for i, v := range items {
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g, ok := v.(WeightedPage)
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if !ok {
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return nil, fmt.Errorf("type %T is not a WeightedPage", v)
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}
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weighted[i] = g
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}
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return weighted, nil
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default:
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return nil, fmt.Errorf("invalid slice type %T", items)
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}
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}
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// collections.Grouper implementations below
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// Group creates a PageGroup from a key and a Pages object
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// This method is not meant for external use. It got its non-typed arguments to satisfy
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// a very generic interface in the tpl package.
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func (p *Page) Group(key interface{}, in interface{}) (interface{}, error) {
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pages, err := toPages(in)
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if err != nil {
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return nil, err
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}
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return PageGroup{Key: key, Pages: pages}, nil
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}
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// ToResources wraps resource.ResourcesConverter
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func (pages Pages) ToResources() resource.Resources {
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r := make(resource.Resources, len(pages))
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for i, p := range pages {
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r[i] = p
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}
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return r
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}
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