mirror of
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
78 lines
2.2 KiB
Go
78 lines
2.2 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 collections
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import (
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"fmt"
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"reflect"
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"testing"
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"github.com/alecthomas/assert"
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"github.com/gohugoio/hugo/deps"
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"github.com/stretchr/testify/require"
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)
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func TestAppend(t *testing.T) {
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t.Parallel()
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ns := New(&deps.Deps{})
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for i, test := range []struct {
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start interface{}
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addend []interface{}
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expected interface{}
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}{
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{[]string{"a", "b"}, []interface{}{"c"}, []string{"a", "b", "c"}},
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{[]string{"a", "b"}, []interface{}{"c", "d", "e"}, []string{"a", "b", "c", "d", "e"}},
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{[]string{"a", "b"}, []interface{}{[]string{"c", "d", "e"}}, []string{"a", "b", "c", "d", "e"}},
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{nil, []interface{}{"a", "b"}, []string{"a", "b"}},
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{nil, []interface{}{nil}, []interface{}{nil}},
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{tstSlicers{&tstSlicer{"a"}, &tstSlicer{"b"}},
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[]interface{}{&tstSlicer{"c"}},
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tstSlicers{&tstSlicer{"a"}, &tstSlicer{"b"}, &tstSlicer{"c"}}},
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{&tstSlicers{&tstSlicer{"a"}, &tstSlicer{"b"}},
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[]interface{}{&tstSlicer{"c"}},
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tstSlicers{&tstSlicer{"a"},
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&tstSlicer{"b"},
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&tstSlicer{"c"}}},
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// Errors
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{"", []interface{}{[]string{"a", "b"}}, false},
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{[]string{"a", "b"}, []interface{}{}, false},
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// No string concatenation.
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{"ab",
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[]interface{}{"c"},
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false},
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} {
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errMsg := fmt.Sprintf("[%d]", i)
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args := append(test.addend, test.start)
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result, err := ns.Append(args...)
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if b, ok := test.expected.(bool); ok && !b {
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require.Error(t, err, errMsg)
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continue
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}
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require.NoError(t, err, errMsg)
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if !reflect.DeepEqual(test.expected, result) {
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t.Fatalf("%s got\n%T: %v\nexpected\n%T: %v", errMsg, result, result, test.expected, test.expected)
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}
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}
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assert.Len(t, ns.Slice(), 0)
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}
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