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Adding Prev/Next functionality to all lists of pages (sections, taxonomies, etc)
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38
hugolib/pagesPrevNext.go
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38
hugolib/pagesPrevNext.go
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// Copyright © 2014 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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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func (p Pages) Prev(cur *Page) *Page {
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for x, c := range p {
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if c.UniqueId() == cur.UniqueId() {
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if x == 0 {
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return p[len(p)-1]
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}
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return p[x-1]
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}
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}
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return nil
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}
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func (p Pages) Next(cur *Page) *Page {
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for x, c := range p {
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if c.UniqueId() == cur.UniqueId() {
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if x < len(p)-1 {
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return p[x+1]
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}
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return p[0]
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}
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}
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return nil
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}
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96
hugolib/pagesPrevNext_test.go
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96
hugolib/pagesPrevNext_test.go
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// Copyright © 2014 Steve Francia <spf@spf13.com>.
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//
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// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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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"testing"
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"github.com/spf13/cast"
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"github.com/stretchr/testify/assert"
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)
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type pagePNTestObject struct {
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path string
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weight int
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date string
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}
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var pagePNTestSources = []pagePNTestObject{
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{"/section1/testpage1.md", 5, "2012-04-06"},
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{"/section1/testpage2.md", 4, "2012-01-01"},
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{"/section1/testpage3.md", 3, "2012-04-06"},
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{"/section2/testpage4.md", 2, "2012-03-02"},
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{"/section2/testpage5.md", 1, "2012-04-06"},
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}
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func preparePagePNTestPages(t *testing.T) Pages {
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var pages Pages
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for _, s := range pagePNTestSources {
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p, err := NewPage(s.path)
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if err != nil {
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t.Fatalf("failed to prepare test page %s", s.path)
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}
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p.Weight = s.weight
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p.Date = cast.ToTime(s.date)
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p.PublishDate = cast.ToTime(s.date)
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pages = append(pages, p)
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}
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return pages
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}
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func TestPrev(t *testing.T) {
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pages := preparePageGroupTestPages(t)
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assert.Equal(t, pages.Prev(pages[0]), pages[4])
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assert.Equal(t, pages.Prev(pages[1]), pages[0])
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assert.Equal(t, pages.Prev(pages[4]), pages[3])
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}
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func TestNext(t *testing.T) {
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pages := preparePageGroupTestPages(t)
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assert.Equal(t, pages.Next(pages[0]), pages[1])
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assert.Equal(t, pages.Next(pages[1]), pages[2])
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assert.Equal(t, pages.Next(pages[4]), pages[0])
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}
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func prepareWeightedPagesPrevNext(t *testing.T) WeightedPages {
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w := WeightedPages{}
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for _, s := range pagePNTestSources {
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p, err := NewPage(s.path)
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if err != nil {
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t.Fatalf("failed to prepare test page %s", s.path)
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}
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p.Weight = s.weight
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p.Date = cast.ToTime(s.date)
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p.PublishDate = cast.ToTime(s.date)
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w = append(w, WeightedPage{p.Weight, p})
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}
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w.Sort()
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return w
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}
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func TestWeightedPagesPrev(t *testing.T) {
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w := prepareWeightedPagesPrevNext(t)
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assert.Equal(t, w.Prev(w[0].Page), w[4].Page)
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assert.Equal(t, w.Prev(w[1].Page), w[0].Page)
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assert.Equal(t, w.Prev(w[4].Page), w[3].Page)
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}
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func TestWeightedPagesNext(t *testing.T) {
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w := prepareWeightedPagesPrevNext(t)
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assert.Equal(t, w.Next(w[0].Page), w[1].Page)
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assert.Equal(t, w.Next(w[1].Page), w[2].Page)
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assert.Equal(t, w.Next(w[4].Page), w[0].Page)
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}
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@ -160,6 +160,30 @@ func (wp WeightedPages) Pages() Pages {
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return pages
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return pages
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}
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}
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func (wp WeightedPages) Prev(cur *Page) *Page {
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for x, c := range wp {
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if c.Page.UniqueId() == cur.UniqueId() {
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if x == 0 {
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return wp[len(wp)-1].Page
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}
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return wp[x-1].Page
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}
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}
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return nil
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}
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func (wp WeightedPages) Next(cur *Page) *Page {
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for x, c := range wp {
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if c.Page.UniqueId() == cur.UniqueId() {
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if x < len(wp)-1 {
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return wp[x+1].Page
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}
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return wp[0].Page
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}
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}
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return nil
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}
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func (p WeightedPages) Len() int { return len(p) }
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func (p WeightedPages) Len() int { return len(p) }
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func (p WeightedPages) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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func (p WeightedPages) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
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func (p WeightedPages) Sort() { sort.Stable(p) }
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func (p WeightedPages) Sort() { sort.Stable(p) }
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