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Add after
template function
Where `first` will return the first N items of a rangeable list, `after` will return all items after the Nth item. This allows the user to do something with the first N items and something different with the remaining items after N.
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parent
82cc1ac0f8
commit
c335efdd06
2 changed files with 74 additions and 2 deletions
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@ -177,7 +177,7 @@ func Substr(a interface{}, nums ...interface{}) (string, error) {
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}
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var start, length int
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toInt := func (v interface{}, message string) (int, error) {
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toInt := func(v interface{}, message string) (int, error) {
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switch i := v.(type) {
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case int:
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return i, nil
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@ -388,6 +388,42 @@ func First(limit interface{}, seq interface{}) (interface{}, error) {
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return seqv.Slice(0, limitv).Interface(), nil
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}
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// After is exposed to templates, to iterate over all the items after N in a
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// rangeable list. It's meant to accompany First
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func After(limit interface{}, seq interface{}) (interface{}, error) {
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if limit == nil || seq == nil {
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return nil, errors.New("both limit and seq must be provided")
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}
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limitv, err := cast.ToIntE(limit)
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if err != nil {
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return nil, err
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}
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if limitv < 1 {
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return nil, errors.New("can't return negative/empty count of items from sequence")
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}
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seqv := reflect.ValueOf(seq)
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seqv, isNil := indirect(seqv)
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if isNil {
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return nil, errors.New("can't iterate over a nil value")
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}
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switch seqv.Kind() {
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case reflect.Array, reflect.Slice, reflect.String:
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// okay
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default:
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return nil, errors.New("can't iterate over " + reflect.ValueOf(seq).Type().String())
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}
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if limitv >= seqv.Len() {
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return nil, errors.New("no items left")
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}
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return seqv.Slice(limitv, seqv.Len()).Interface(), nil
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}
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var (
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zero reflect.Value
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errorType = reflect.TypeOf((*error)(nil)).Elem()
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@ -1252,6 +1288,7 @@ func init() {
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"relURL": func(a string) template.HTML { return template.HTML(helpers.RelURL(a)) },
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"markdownify": Markdownify,
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"first": First,
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"after": After,
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"where": Where,
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"delimit": Delimit,
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"sort": Sort,
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@ -4,13 +4,14 @@ import (
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"bytes"
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"errors"
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"fmt"
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"github.com/stretchr/testify/assert"
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"html/template"
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"path"
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"reflect"
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"runtime"
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"testing"
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"time"
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"github.com/stretchr/testify/assert"
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)
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type tstNoStringer struct {
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@ -252,6 +253,40 @@ func TestFirst(t *testing.T) {
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}
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}
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func TestAfter(t *testing.T) {
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for i, this := range []struct {
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count interface{}
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sequence interface{}
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expect interface{}
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}{
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{int(2), []string{"a", "b", "c", "d"}, []string{"c", "d"}},
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{int32(3), []string{"a", "b"}, false},
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{int64(2), []int{100, 200, 300}, []int{300}},
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{100, []int{100, 200}, false},
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{"1", []int{100, 200, 300}, []int{200, 300}},
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{int64(-1), []int{100, 200, 300}, false},
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{"noint", []int{100, 200, 300}, false},
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{1, nil, false},
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{nil, []int{100}, false},
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{1, t, false},
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} {
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results, err := After(this.count, this.sequence)
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if b, ok := this.expect.(bool); ok && !b {
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if err == nil {
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t.Errorf("[%d] First didn't return an expected error", i)
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}
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} else {
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if err != nil {
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t.Errorf("[%d] failed: %s", i, err)
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continue
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}
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if !reflect.DeepEqual(results, this.expect) {
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t.Errorf("[%d] First %d items, got %v but expected %v", i, this.count, results, this.expect)
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}
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}
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}
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}
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func TestIn(t *testing.T) {
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for i, this := range []struct {
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v1 interface{}
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