Add ByLastmod page sort

diff --git a/hugolib/pageSort.go b/hugolib/pageSort.go
index 7381cf9dd50e891332347f3ba5363914b9605227..40c18e4c648b0cf5263a2e78aaccd2b492362193 100644 (file)
--- a/hugolib/pageSort.go
+++ b/hugolib/pageSort.go
@@ -158,6 +158,24 @@ func (p Pages) ByPublishDate() Pages {
        return pages
 }
 
+// ByLastmod sorts the Pages by the last modification date and returns a copy.
+//
+// Adjacent invocactions on the same receiver will return a cached result.
+//
+// This may safely be executed  in parallel.
+func (p Pages) ByLastmod() Pages {
+
+       key := "pageSort.ByLastmod"
+
+       date := func(p1, p2 *Page) bool {
+               return p1.Lastmod.Unix() < p2.Lastmod.Unix()
+       }
+
+       pages, _ := spc.get(key, p, pageBy(date).Sort)
+
+       return pages
+}
+
 // ByLength sorts the Pages by length and returns a copy.
 //
 // Adjacent invocactions on the same receiver will return a cached result.

diff --git a/hugolib/pageSort_test.go b/hugolib/pageSort_test.go
index 0d1552f1cdd41513eacbbac105d8985353b73078..f3fecb0beadd21b1083c60c5baac8ff10b3d2228 100644 (file)
--- a/hugolib/pageSort_test.go
+++ b/hugolib/pageSort_test.go
@@ -15,12 +15,13 @@ package hugolib
 
 import (
        "fmt"
-       "github.com/spf13/hugo/source"
-       "github.com/stretchr/testify/assert"
        "html/template"
        "path/filepath"
        "testing"
        "time"
+
+       "github.com/spf13/hugo/source"
+       "github.com/stretchr/testify/assert"
 )
 
 func TestDefaultSort(t *testing.T) {
@@ -67,6 +68,7 @@ func TestSortByN(t *testing.T) {
                {(Pages).ByLinkTitle, func(p Pages) bool { return p[0].LinkTitle() == "abl" }},
                {(Pages).ByDate, func(p Pages) bool { return p[0].Date == d3 }},
                {(Pages).ByPublishDate, func(p Pages) bool { return p[0].PublishDate == d3 }},
+               {(Pages).ByLastmod, func(p Pages) bool { return p[1].Lastmod == d2 }},
                {(Pages).ByLength, func(p Pages) bool { return p[0].Content == "b_content" }},
        } {
                setSortVals([3]time.Time{d1, d2, d3}, [3]string{"b", "ab", "cde"}, [3]int{3, 2, 1}, p)
@@ -114,6 +116,7 @@ func BenchmarkSortByWeightAndReverse(b *testing.B) {
 func setSortVals(dates [3]time.Time, titles [3]string, weights [3]int, pages Pages) {
        for i := range dates {
                pages[i].Date = dates[i]
+               pages[i].Lastmod = dates[i]
                pages[i].Weight = weights[i]
                pages[i].Title = titles[i]
                // make sure we compare apples and ... apples ...
@@ -121,7 +124,9 @@ func setSortVals(dates [3]time.Time, titles [3]string, weights [3]int, pages Pag
                pages[len(dates)-1-i].PublishDate = dates[i]
                pages[len(dates)-1-i].Content = template.HTML(titles[i] + "_content")
        }
-
+       lastLastMod := pages[2].Lastmod
+       pages[2].Lastmod = pages[1].Lastmod
+       pages[1].Lastmod = lastLastMod
 }
 
 func createSortTestPages(num int) Pages {