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5e28606b84
`GroupBy` is modified to allow it to receive a method name argument for example `Type` as its first argument. It is only allowed to call with a method which takes no arguments and returns a result or a pair of a result and an error. The functions discussed at #443 are also added - `ByPublishDate`: Order contents by `PublishDate` front matter variable - `GroupByPublishDate(format, order)`: Group contents by `PublishDate` front matter variable formatted in string like `GroupByDate` - `GroupByParam(key, order)`: Group contents by `Param` front matter variable specified by `key` argument - `GroupByParamDate(key, format, order)`: Group contents by `Param` front matter variable specified by `key` argument and formatted in string like `GroupByDate`. It's effective against `time.Time` type front matter variable
123 lines
2.7 KiB
Go
123 lines
2.7 KiB
Go
// 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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"sort"
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)
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/*
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* Implementation of a custom sorter for Pages
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*/
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// A type to implement the sort interface for Pages
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type PageSorter struct {
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pages Pages
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by PageBy
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}
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// Closure used in the Sort.Less method.
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type PageBy func(p1, p2 *Page) bool
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func (by PageBy) Sort(pages Pages) {
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ps := &PageSorter{
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pages: pages,
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by: by, // The Sort method's receiver is the function (closure) that defines the sort order.
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}
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sort.Stable(ps)
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}
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var DefaultPageSort = func(p1, p2 *Page) bool {
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if p1.Weight == p2.Weight {
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return p1.Date.Unix() > p2.Date.Unix()
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} else {
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return p1.Weight < p2.Weight
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}
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}
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func (ps *PageSorter) Len() int { return len(ps.pages) }
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func (ps *PageSorter) Swap(i, j int) { ps.pages[i], ps.pages[j] = ps.pages[j], ps.pages[i] }
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// Less is part of sort.Interface. It is implemented by calling the "by" closure in the sorter.
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func (ps *PageSorter) Less(i, j int) bool { return ps.by(ps.pages[i], ps.pages[j]) }
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func (p Pages) Sort() {
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PageBy(DefaultPageSort).Sort(p)
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}
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func (p Pages) Limit(n int) Pages {
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if len(p) < n {
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return p[0:n]
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} else {
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return p
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}
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}
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func (p Pages) ByWeight() Pages {
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PageBy(DefaultPageSort).Sort(p)
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return p
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}
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func (p Pages) ByTitle() Pages {
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title := func(p1, p2 *Page) bool {
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return p1.Title < p2.Title
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}
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PageBy(title).Sort(p)
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return p
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}
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func (p Pages) ByLinkTitle() Pages {
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linkTitle := func(p1, p2 *Page) bool {
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return p1.linkTitle < p2.linkTitle
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}
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PageBy(linkTitle).Sort(p)
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return p
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}
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func (p Pages) ByDate() Pages {
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date := func(p1, p2 *Page) bool {
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return p1.Date.Unix() < p2.Date.Unix()
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}
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PageBy(date).Sort(p)
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return p
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}
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func (p Pages) ByPublishDate() Pages {
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pubDate := func(p1, p2 *Page) bool {
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return p1.PublishDate.Unix() < p2.PublishDate.Unix()
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}
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PageBy(pubDate).Sort(p)
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return p
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}
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func (p Pages) ByLength() Pages {
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length := func(p1, p2 *Page) bool {
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return len(p1.Content) < len(p2.Content)
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}
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PageBy(length).Sort(p)
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return p
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}
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func (p Pages) Reverse() Pages {
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for i, j := 0, len(p)-1; i < j; i, j = i+1, j-1 {
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p[i], p[j] = p[j], p[i]
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}
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return p
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}
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