github.com/olliephillips/hugo@v0.42.2/hugolib/pagesPrevNext.go (about)

     1  // Copyright 2015 The Hugo Authors. All rights reserved.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  // http://www.apache.org/licenses/LICENSE-2.0
     7  //
     8  // Unless required by applicable law or agreed to in writing, software
     9  // distributed under the License is distributed on an "AS IS" BASIS,
    10  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package hugolib
    15  
    16  // Prev returns the previous page reletive to the given page.
    17  func (p Pages) Prev(cur *Page) *Page {
    18  	for x, c := range p {
    19  		if c.Eq(cur) {
    20  			if x == 0 {
    21  				// TODO(bep) consider return nil here to get it line with the other Prevs
    22  				return p[len(p)-1]
    23  			}
    24  			return p[x-1]
    25  		}
    26  	}
    27  	return nil
    28  }
    29  
    30  // Next returns the next page reletive to the given page.
    31  func (p Pages) Next(cur *Page) *Page {
    32  	for x, c := range p {
    33  		if c.Eq(cur) {
    34  			if x < len(p)-1 {
    35  				return p[x+1]
    36  			}
    37  			// TODO(bep) consider return nil here to get it line with the other Nexts
    38  			return p[0]
    39  		}
    40  	}
    41  	return nil
    42  }