ref: b719ba7e2bd612e85e539b17569ed15066ebcc07
parent: 78316903a24af73b476032295caba56588558924
author: spf13 <[email protected]>
date: Thu Nov 27 18:08:06 EST 2014
Adding Prev/Next functionality to all lists of pages (sections, taxonomies, etc)
--- /dev/null
+++ b/hugolib/pagesPrevNext.go
@@ -1,0 +1,38 @@
+// Copyright © 2014 Steve Francia <[email protected]>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hugolib
+
+func (p Pages) Prev(cur *Page) *Page {+ for x, c := range p {+ if c.UniqueId() == cur.UniqueId() {+ if x == 0 {+ return p[len(p)-1]
+ }
+ return p[x-1]
+ }
+ }
+ return nil
+}
+
+func (p Pages) Next(cur *Page) *Page {+ for x, c := range p {+ if c.UniqueId() == cur.UniqueId() {+ if x < len(p)-1 {+ return p[x+1]
+ }
+ return p[0]
+ }
+ }
+ return nil
+}
--- /dev/null
+++ b/hugolib/pagesPrevNext_test.go
@@ -1,0 +1,96 @@
+// Copyright © 2014 Steve Francia <[email protected]>.
+//
+// Licensed under the Simple Public License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://opensource.org/licenses/Simple-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package hugolib
+
+import (
+ "testing"
+
+ "github.com/spf13/cast"
+ "github.com/stretchr/testify/assert"
+)
+
+type pagePNTestObject struct {+ path string
+ weight int
+ date string
+}
+
+var pagePNTestSources = []pagePNTestObject{+ {"/section1/testpage1.md", 5, "2012-04-06"},+ {"/section1/testpage2.md", 4, "2012-01-01"},+ {"/section1/testpage3.md", 3, "2012-04-06"},+ {"/section2/testpage4.md", 2, "2012-03-02"},+ {"/section2/testpage5.md", 1, "2012-04-06"},+}
+
+func preparePagePNTestPages(t *testing.T) Pages {+ var pages Pages
+ for _, s := range pagePNTestSources {+ p, err := NewPage(s.path)
+ if err != nil {+ t.Fatalf("failed to prepare test page %s", s.path)+ }
+ p.Weight = s.weight
+ p.Date = cast.ToTime(s.date)
+ p.PublishDate = cast.ToTime(s.date)
+ pages = append(pages, p)
+ }
+ return pages
+}
+
+func TestPrev(t *testing.T) {+ pages := preparePageGroupTestPages(t)
+ assert.Equal(t, pages.Prev(pages[0]), pages[4])
+ assert.Equal(t, pages.Prev(pages[1]), pages[0])
+ assert.Equal(t, pages.Prev(pages[4]), pages[3])
+}
+
+func TestNext(t *testing.T) {+ pages := preparePageGroupTestPages(t)
+ assert.Equal(t, pages.Next(pages[0]), pages[1])
+ assert.Equal(t, pages.Next(pages[1]), pages[2])
+ assert.Equal(t, pages.Next(pages[4]), pages[0])
+}
+
+func prepareWeightedPagesPrevNext(t *testing.T) WeightedPages {+ w := WeightedPages{}+
+ for _, s := range pagePNTestSources {+ p, err := NewPage(s.path)
+ if err != nil {+ t.Fatalf("failed to prepare test page %s", s.path)+ }
+ p.Weight = s.weight
+ p.Date = cast.ToTime(s.date)
+ p.PublishDate = cast.ToTime(s.date)
+ w = append(w, WeightedPage{p.Weight, p})+ }
+
+ w.Sort()
+ return w
+}
+
+func TestWeightedPagesPrev(t *testing.T) {+ w := prepareWeightedPagesPrevNext(t)
+ assert.Equal(t, w.Prev(w[0].Page), w[4].Page)
+ assert.Equal(t, w.Prev(w[1].Page), w[0].Page)
+ assert.Equal(t, w.Prev(w[4].Page), w[3].Page)
+}
+
+func TestWeightedPagesNext(t *testing.T) {+ w := prepareWeightedPagesPrevNext(t)
+ assert.Equal(t, w.Next(w[0].Page), w[1].Page)
+ assert.Equal(t, w.Next(w[1].Page), w[2].Page)
+ assert.Equal(t, w.Next(w[4].Page), w[0].Page)
+}
--- a/hugolib/taxonomy.go
+++ b/hugolib/taxonomy.go
@@ -160,6 +160,30 @@
return pages
}
+func (wp WeightedPages) Prev(cur *Page) *Page {+ for x, c := range wp {+ if c.Page.UniqueId() == cur.UniqueId() {+ if x == 0 {+ return wp[len(wp)-1].Page
+ }
+ return wp[x-1].Page
+ }
+ }
+ return nil
+}
+
+func (wp WeightedPages) Next(cur *Page) *Page {+ for x, c := range wp {+ if c.Page.UniqueId() == cur.UniqueId() {+ if x < len(wp)-1 {+ return wp[x+1].Page
+ }
+ return wp[0].Page
+ }
+ }
+ return nil
+}
+
func (p WeightedPages) Len() int { return len(p) } func (p WeightedPages) Swap(i, j int) { p[i], p[j] = p[j], p[i] } func (p WeightedPages) Sort() { sort.Stable(p) }