helpers.go (2040B)
1 // Copyright 2020 The Hugo Authors. All rights reserved.
2 //
3 // Portions Copyright The Go Authors.
4
5 // Licensed under the Apache License, Version 2.0 (the "License");
6 // you may not use this file except in compliance with the License.
7 // You may obtain a copy of the License at
8 // http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15
16 package resourcehelpers
17
18 import (
19 "errors"
20 "fmt"
21
22 "github.com/gohugoio/hugo/common/maps"
23 "github.com/gohugoio/hugo/resources"
24 )
25
26 // We allow string or a map as the first argument in some cases.
27 func ResolveIfFirstArgIsString(args []any) (resources.ResourceTransformer, string, bool) {
28 if len(args) != 2 {
29 return nil, "", false
30 }
31
32 v1, ok1 := args[0].(string)
33 if !ok1 {
34 return nil, "", false
35 }
36 v2, ok2 := args[1].(resources.ResourceTransformer)
37
38 return v2, v1, ok2
39 }
40
41 // This roundabout way of doing it is needed to get both pipeline behaviour and options as arguments.
42 func ResolveArgs(args []any) (resources.ResourceTransformer, map[string]any, error) {
43 if len(args) == 0 {
44 return nil, nil, errors.New("no Resource provided in transformation")
45 }
46
47 if len(args) == 1 {
48 r, ok := args[0].(resources.ResourceTransformer)
49 if !ok {
50 return nil, nil, fmt.Errorf("type %T not supported in Resource transformations", args[0])
51 }
52 return r, nil, nil
53 }
54
55 r, ok := args[1].(resources.ResourceTransformer)
56 if !ok {
57 if _, ok := args[1].(map[string]any); !ok {
58 return nil, nil, fmt.Errorf("no Resource provided in transformation")
59 }
60 return nil, nil, fmt.Errorf("type %T not supported in Resource transformations", args[0])
61 }
62
63 m, err := maps.ToStringMapE(args[0])
64 if err != nil {
65 return nil, nil, fmt.Errorf("invalid options type: %w", err)
66 }
67
68 return r, m, nil
69 }