github.com/amplia-iiot/yutil@v1.0.1-0.20231229120411-5d96a4c5a136/pkg/merge/content.go (about) 1 /* 2 Copyright (c) 2021 amplia-iiot 3 4 Permission is hereby granted, free of charge, to any person obtaining a copy 5 of this software and associated documentation files (the "Software"), to deal 6 in the Software without restriction, including without limitation the rights 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 8 copies of the Software, and to permit persons to whom the Software is 9 furnished to do so, subject to the following conditions: 10 11 The above copyright notice and this permission notice shall be included in all 12 copies or substantial portions of the Software. 13 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 20 SOFTWARE. 21 */ 22 23 package merge 24 25 import ( 26 "errors" 27 28 "github.com/amplia-iiot/yutil/internal/yaml" 29 ) 30 31 // MergeContents returns the result of merging two yaml contents. A yaml leaf 32 // node in the 'changes' content takes precedence over and replaces the value in 33 // the 'base' content. 34 func MergeContents(base string, changes string) (string, error) { 35 baseData, err := yaml.Parse(base) 36 if err != nil { 37 return "", err 38 } 39 changesData, err := yaml.Parse(changes) 40 if err != nil { 41 return "", err 42 } 43 mergedData, err := yaml.Merge(baseData, changesData) 44 if err != nil { 45 return "", err 46 } 47 return yaml.Compose(mergedData) 48 } 49 50 // MergeAllContents returns the result of merging all yaml contents, which should 51 // be ordered in ascending level of importance in the hierarchy. A yaml leaf node 52 // in the last content takes precedence over and replaces the value in any 53 // previous content. 54 func MergeAllContents(contents []string) (string, error) { 55 if len(contents) < 2 { 56 return "", errors.New("slice must contain at least two contents") 57 } 58 var result string 59 var err error 60 result = contents[0] 61 for i := 1; i < len(contents); i++ { 62 result, err = MergeContents(result, contents[i]) 63 if err != nil { 64 return "", err 65 } 66 } 67 return result, nil 68 }