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common/collections: Allow a mix of slice types in append/Scratch.Add
The type handling in these was improved in Hugo 0.49, but this also meant that it was no longer possible to start out with a string slice and later append `Page` etc. to it. This commit makes sure that the old behaviour is now possible again by falling back to a `[]interface{}` as a last resort. Fixes #5361
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parent
b27ccf34bf
commit
dac7092a9c
3 changed files with 51 additions and 4 deletions
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@ -48,6 +48,10 @@ func Append(to interface{}, from ...interface{}) (interface{}, error) {
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// If we get []string []string, we append the from slice to to
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if tot == fromt {
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return reflect.AppendSlice(tov, fromv).Interface(), nil
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} else if !fromt.AssignableTo(tot) {
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// Fall back to a []interface{} slice.
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return appendToInterfaceSliceFromValues(tov, fromv)
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}
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}
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}
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@ -60,7 +64,8 @@ func Append(to interface{}, from ...interface{}) (interface{}, error) {
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for _, f := range from {
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fv := reflect.ValueOf(f)
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if !fv.Type().AssignableTo(tot) {
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return nil, fmt.Errorf("append element type mismatch: expected %v, got %v", tot, fv.Type())
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// Fall back to a []interface{} slice.
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return appendToInterfaceSlice(tov, from...)
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}
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tov = reflect.Append(tov, fv)
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}
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@ -68,6 +73,32 @@ func Append(to interface{}, from ...interface{}) (interface{}, error) {
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return tov.Interface(), nil
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}
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func appendToInterfaceSliceFromValues(slice1, slice2 reflect.Value) ([]interface{}, error) {
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var tos []interface{}
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for _, slice := range []reflect.Value{slice1, slice2} {
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for i := 0; i < slice.Len(); i++ {
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tos = append(tos, slice.Index(i).Interface())
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}
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}
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return tos, nil
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}
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func appendToInterfaceSlice(tov reflect.Value, from ...interface{}) ([]interface{}, error) {
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var tos []interface{}
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for i := 0; i < tov.Len(); i++ {
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tos = append(tos, tov.Index(i).Interface())
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}
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for _, v := range from {
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tos = append(tos, v)
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}
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return tos, nil
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}
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// indirect is borrowed from the Go stdlib: 'text/template/exec.go'
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// TODO(bep) consolidate
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func indirect(v reflect.Value) (rv reflect.Value, isNil bool) {
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@ -46,10 +46,12 @@ func TestAppend(t *testing.T) {
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{testSlicerInterfaces{&tstSlicerIn1{"a"}, &tstSlicerIn1{"b"}},
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[]interface{}{&tstSlicerIn1{"c"}},
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testSlicerInterfaces{&tstSlicerIn1{"a"}, &tstSlicerIn1{"b"}, &tstSlicerIn1{"c"}}},
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//https://github.com/gohugoio/hugo/issues/5361
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{[]string{"a", "b"}, []interface{}{tstSlicers{&tstSlicer{"a"}, &tstSlicer{"b"}}},
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[]interface{}{"a", "b", &tstSlicer{"a"}, &tstSlicer{"b"}}},
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{[]string{"a", "b"}, []interface{}{&tstSlicer{"a"}},
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[]interface{}{"a", "b", &tstSlicer{"a"}}},
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// Errors
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{testSlicerInterfaces{&tstSlicerIn1{"a"}, &tstSlicerIn1{"b"}},
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[]interface{}{"c"},
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false},
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{"", []interface{}{[]string{"a", "b"}}, false},
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// No string concatenation.
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{"ab",
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@ -96,6 +96,20 @@ func TestScratchAddTypedSliceToInterfaceSlice(t *testing.T) {
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}
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// https://github.com/gohugoio/hugo/issues/5361
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func TestScratchAddDifferentTypedSliceToInterfaceSlice(t *testing.T) {
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t.Parallel()
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assert := require.New(t)
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scratch := NewScratch()
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scratch.Set("slice", []string{"foo"})
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_, err := scratch.Add("slice", []int{1, 2})
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assert.NoError(err)
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assert.Equal([]interface{}{"foo", 1, 2}, scratch.Get("slice"))
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}
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func TestScratchSet(t *testing.T) {
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t.Parallel()
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assert := require.New(t)
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