fix: move from devenv to nix flake

.chglog/CHANGELOG.tpl.md → .config/chglog/CHANGELOG.tpl.md

 {{ range .Versions }}
-<a name="{{ .Tag.Name }}"></a>
 ## {{ if .Tag.Previous }}[{{ .Tag.Name }}]{{ else }}{{ .Tag.Name }}{{ end }} - {{ datetime "2006-01-02" .Tag.Date }}
+
 {{ range .CommitGroups -}}
+
 ### {{ .Title }}
+
 {{ range .Commits -}}
 - {{ if .Scope }}**{{ .Scope }}:** {{ end }}{{ .Subject }}
-{{ end }}
-{{ end -}}
+{{ end }}{{ end -}}
 
-{{- if .NoteGroups -}}
-{{ range .NoteGroups -}}
-### {{ .Title }}
-{{ range .Notes }}
-{{ .Body }}
-{{ end }}
-{{ end -}}
-{{ end -}}
 {{ end -}}
 
-{{- if .Versions }}
-{{ range .Versions -}}
-{{ if .Tag.Previous -}}
-[{{ .Tag.Name }}]: {{ $.Info.RepositoryURL }}/compare/{{ .Tag.Previous.Name }}...{{ .Tag.Name }}
-{{ end -}}
-{{ end -}}
-{{ end -}}
+

.chglog/config.yml → .config/chglog/config.yml

@@ -2,7 +2,7 @@ style: gitlab
 template: CHANGELOG.tpl.md
 info:
   title: CHANGELOG
-  repository_url: https://gitlab.schukai.com/oss/libraries/go/markup/html
+  repository_url: https://gitlab.schukai.com/oss/libraries/go/application/configuration
 options:
   commits:
     filters:

.envrc

-source_url "https://raw.githubusercontent.com/cachix/devenv/d1f7b48e35e6dee421cfd0f51481d17f77586997/direnvrc" "sha256-YBzqskFZxmNb3kYVoKD9ZixoPXJh1C9ZvTLGFRkauZ0="
-
-use devenv
\ No newline at end of file
+watch_file ./flake.nix ./nix/scripts/*.nix ./nix/config/*.nix ./nix/packages/*.nix 
+use flake
\ No newline at end of file

.gitlab-ci.yml

-
-# THIS FILE IS AUTOGENERATED BY THE DEVENVSHELL
-# DO NOT EDIT THIS FILE MANUALLY
-# INSTEAD EDIT THE DEVENVSHELL CONFIGURATION FILE devenv.nix
-# AND OPEN A SHELL WITH THE COMMAND devenv shell
-#
-
-image: docker-registry.schukai.com:443/nixos-ci-devenv:latest
-
 variables:
-  # The repo name as used in
-  # https://github.com/nix-community/NUR/blob/master/repos.json
-  NIXOS_VERSION: "23.05"
   NIXPKGS_ALLOW_UNFREE: "1"
   NIXPKGS_ALLOW_INSECURE: "1"
   GIT_DEPTH: 10
+  GIT_SUBMODULE_STRATEGY: normal
+  GIT_SUBMODULE_DEPTH: 1
+
 
 stages:
   - test
-  - deploy 
+  - release
 
 before_script:
-  - echo > .env-gitlab-ci
-  - variables=("HOME=$HOME" "CI_COMMIT_REF_NAME=$CI_COMMIT_REF_NAME" "CI_REPOSITORY_URL=$CI_REPOSITORY_URL" "GITLAB_TOKEN=$GITLAB_TOKEN" "CI_JOB_TOKEN=$CI_JOB_TOKEN" "GITLAB_USER_EMAIL=$GITLAB_USER_EMAIL" "GITLAB_USER_NAME=\"$GITLAB_USER_NAME\"" "CI_REGISTRY_USER=$CI_REGISTRY_USER" "CI_PROJECT_ID=$CI_PROJECT_ID" "CI_PROJECT_DIR=$CI_PROJECT_DIR" "CI_API_V4_URL=$CI_API_V4_URL" "CI_PROJECT_NAME=$CI_PROJECT_NAME" "CI_COMMIT_SHORT_SHA=$CI_COMMIT_SHORT_SHA"); for var in "${variables[@]}"; do echo "$var" >> .env-gitlab-ci; done
-  - cat .env-gitlab-ci
+  - git config --global user.email "${GITLAB_USER_EMAIL}"
+  - git config --global user.name "${GITLAB_USER_NAME:-"Gitlab CI"}"
+  - git config --global credential.helper '!f() { echo "username=gitlab-ci-token"; echo "password=${CI_JOB_TOKEN}"; }; f'
+  - git config --global pull.rebase true
+  - git config --global http.sslVerify "false"
+
 
 after_script:
-  - if [ -f .env-gitlab-ci ]; then rm .env-gitlab-ci; fi
+  - nix develop .#gitlab --command clean-up
 
-test:
+tests:
   stage: test
   tags:
-    - nixos
+    - nixos-gen3
   script:
-    - devenv shell test-lib
-
-  cache:
-    - key: nixos
-      paths:
-        - /nix/store
-  
+    - nix develop .#gitlab --command run-ci-tests
   artifacts:
     paths:
-      - dist
+      - last-phpunit-result.xml
 
-deploy:
-  stage: deploy
+release:
+  stage: release
   tags:
-    - nixos
+    - nixos-gen3
   script:
-    - devenv shell -c deploy-lib
-
+    - nix develop .#gitlab --command release
   when: on_success
-
-  cache:
-    - key: nixos
-      paths:
-        - /nix/store
-
+  rules:
+    - if: $CI_COMMIT_BRANCH == "master"
+  
\ No newline at end of file

.gitlab/issue_templates/rfc.md

+# RFC: [Titel deines Vorschlags]
+
+Kurze Beschreibung des Inhalts und Ziels dieses RFC.
+
+### Zweig:
+In welchem Zweig ist/wird der RFC implementiert?
+
+## Reviewer
+Liste Personen oder Teams auf, die für das Review dieses RFC verantwortlich sind.
+
+- [ ] @reviewer1
+
+## Hintergrund
+Erläutere den Kontext und die Probleme, die zur Erstellung dieses RFC geführt haben.
+
+## Grundlegende Beispiele
+Biete einfache Beispiele, die die vorgeschlagenen Änderungen veranschaulichen.
+
+## Motivation
+Beschreibe, warum diese Änderung notwendig ist. Welche Probleme werden gelöst? Was sind die Vorteile?
+
+## Vorgeschlagene Lösung
+Detaillierte Beschreibung der vorgeschlagenen Features und Funktionen.
+
+## Detailliertes Design und Umsetzung
+Erkläre technische Details, Implementierungsschritte und wie die Lösung integriert werden soll.
+
+## Roadmap und benötigte Ressourcen
+Skizziere die geplanten Schritte zur Implementierung und liste benötigte Ressourcen auf.
+
+## Vor- und Nachteile / Einschränkungen
+Diskutiere die möglichen Nachteile oder Limitationen des Vorschlags sowie die Risiken.
+
+## Alternativen
+Stelle andere überlegte Lösungen vor und erkläre, warum sie verworfen oder nicht berücksichtigt wurden.
+
+## Neue und geänderte Konfigurationswerte
+- **Neue Werte**
+- **Geänderte Werte**
+- **Beispielkonfigurationen**
+
+## Schulungsmaßnahmen
+Beschreibe, wie du planst, das Team und die Nutzer über die Änderungen zu informieren und zu schulen.
+
+## Legal und Privacy
+Beschreibe die Auswirkungen auf rechtliche und Datenschutzaspekte.
+
+## Risiken
+Beschreibe mögliche Risiken und wie sie minimiert werden können.
+
+## Offene Fragen
+Diskutiere Aspekte, die noch geklärt werden müssen und bei denen Feedback erforderlich ist.
+
+## Nicht betroffene Funktionalität
+Identifiziere Bereiche, die durch diesen RFC nicht beeinflusst werden.
+
+## Zukünftiger Anwendungsbereich
+Betrachte zukünftige Erweiterungen oder Verbesserungen, die auf diesem Vorschlag aufbauen könnten.
+
+## Patches und Tests
+- **Patch-Verfügbarkeit**
+- **Testpläne**
+
+## Implementierung
+Nachdem das Projekt implementiert wurde, sollte dieser Abschnitt Folgendes enthalten:
+1. Die Version(en), in die das Feature eingefügt wurde.
+2. Einen Link zu den entsprechenden Git-Commits.
+3. Einen Link zum Handbuch-Eintrag für das Feature.
+4. Einen Link zum Abschnitt mit den Sprachspezifikationen (falls vorhanden).
+
+## Referenzen
+Verweise auf relevante externe Diskussionen, Dokumente oder andere RFCs.
+
+## Abgelehnte Features
+Erläutere, welche Features vorgeschlagen, aber nicht angenommen wurden, und warum.

.gitlab/issue_templates/thoughts-and-ideas.md

+# Gedanken und Ideen
+
+Beschreibe Deine Gedanken und Ideen, die Du mit anderen teilen möchtest. Dieses Template ist für 
+allgemeine Diskussionen und Brainstorming gedacht. Wenn Du eine spezifische Änderung oder ein neues 
+Feature vorschlagen möchtest, verwende bitte das [RFC-Template](./rfc.md).

Taskfile.yml

-
-# THIS FILE IS AUTOGENERATED BY THE DEVENVSHELL
-# DO NOT EDIT THIS FILE MANUALLY
-# INSTEAD EDIT THE DEVENVSHELL CONFIGURATION FILE devenv.nix 
-# AND OPEN A SHELL WITH THE COMMAND devenv shell
-#
-# Information about the task runner can be found here:
-# https://taskfile.dev
-
-version: '3'
-
-tasks:
-  default: 
-    cmds:
-      - task --list
-    silent: true
-    
-  test:
-    desc: Execute unit tests in Go.
-    env:
-      TEST_BY_TASK: true
-    cmds:
-      - echo "Execute unit tests in Go."
-      - gosec .
-      - go test -tags=runOnTask -cover -v ./...
-      - go test -tags=runOnTask -bench -v ./...
-      - go test -tags=runOnTask -race -v ./...
-
-  test-fuzz:
-    desc: Conduct fuzzing tests.#
-    env:
-      TEST_BY_TASK: true
-    cmds:  
-      - echo "Conduct fuzzing tests."
-      - go test -tags=runOnTask -v -fuzztime=30s -fuzz=Fuzz ./...
-
-  add-licenses:
-    desc: Attach license headers to Go files.
-    cmds:
-      - echo "Attach license headers to Go files."
-      - go install github.com/google/addlicense@latest
-      - addlicense -c "schukai GmbH" -s -l "AGPL-3.0" ./*.go
-    silent: true
-    
-  check-licenses:
-    desc: Check license headers of Go files.
-    silent: true
-    cmds:
-      - go-licenses save "$(get-go-default-packages)"  --ignore "gitlab.schukai.com"  --force --save_path ${DEVENV_ROOT}/licenses/
-
-  check:
-    desc: Confirm repository status.
-    cmds:
-      - git diff-index --quiet HEAD || (echo "There are uncommitted changes after running make. Please commit or stash them before running make."; exit 1)
-    silent: true
-
-  commit:
-    desc: Commit changes to the repository.
-    aliases:
-      - c
-      - ci
-      - git-commit
-    cmds:
-      - do-git-commit

devenv.yaml

-inputs:
-  nixpkgs:
-    url: github:nixos/nixpkgs/nixos-23.11
-
-  version:
-    url: git+https://gitlab.schukai.com/oss/utilities/version.git
-    flake: true

documentation/licenses/github.com/fsnotify/fsnotify/LICENSE

+Copyright © 2012 The Go Authors. All rights reserved.
+Copyright © fsnotify Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+* Neither the name of Google Inc. nor the names of its contributors may be used
+  to endorse or promote products derived from this software without specific
+  prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

documentation/licenses/github.com/imdario/mergo/LICENSE

+Copyright (c) 2013 Dario Castañé. All rights reserved.
+Copyright (c) 2012 The Go Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are
+met:
+
+   * Redistributions of source code must retain the above copyright
+notice, this list of conditions and the following disclaimer.
+   * Redistributions in binary form must reproduce the above
+copyright notice, this list of conditions and the following disclaimer
+in the documentation and/or other materials provided with the
+distribution.
+   * Neither the name of Google Inc. nor the names of its
+contributors may be used to endorse or promote products derived from
+this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

documentation/licenses/github.com/magiconair/properties/LICENSE.md

+Copyright (c) 2013-2020, Frank Schroeder
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+ * Redistributions of source code must retain the above copyright notice, this
+   list of conditions and the following disclaimer.
+
+ * Redistributions in binary form must reproduce the above copyright notice,
+   this list of conditions and the following disclaimer in the documentation
+   and/or other materials provided with the distribution.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

documentation/licenses/github.com/pelletier/go-toml/v2/LICENSE

+The MIT License (MIT)
+
+go-toml v2
+Copyright (c) 2021 - 2023 Thomas Pelletier
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

documentation/licenses/github.com/r3labs/diff/v3/.gitignore

+# Binaries for programs and plugins
+*.exe
+*.dll
+*.so
+*.dylib
+
+# Test binary, build with `go test -c`
+*.test
+
+# Output of the go coverage tool, specifically when used with LiteIDE
+*.out
+
+# Project-local glide cache, RE: https://github.com/Masterminds/glide/issues/736
+.glide/
+.idea/
+
+patchflags_string.go

documentation/licenses/github.com/r3labs/diff/v3/CONTRIBUTING.md

+# Contributing guidelines
+
+Looking to contribute something to this project? Here's how you can help:
+
+Please take a moment to review this document in order to make the contribution process easy and effective for everyone involved.
+
+Following these guidelines helps to communicate that you respect the time of the developers managing and developing this open source project. In return, they should reciprocate that respect in addressing your issue or assessing patches and features.
+
+We also have a [code of conduct](https://ernest.io/conduct).
+
+## Using the issue tracker
+
+The issue tracker is the preferred channel for [bug reports](#bug-reports), [features requests](#feature-requests) and [submitting pull requests](#pull-requests), but please respect the following restrictions:
+
+* Please **do not** use the issue tracker for personal support requests.
+
+* Please **do not** derail issues. Keep the discussion on topic and
+  respect the opinions of others.
+
+<a name="bugs"></a>
+## Bug reports
+
+A bug is a _demonstrable problem_ that is caused by the code in the repository.
+Good bug reports are extremely helpful - thank you!
+
+Guidelines for bug reports:
+
+1. **Use the GitHub issue search** &mdash; check if the issue has already been
+   reported.
+
+2. **Check if the issue has been fixed** &mdash; try to reproduce it using the
+   latest `master` or `develop` branch in the repository.
+
+3. **Isolate the problem** &mdash; create a reduced test case and a live example.
+
+A good bug report shouldn't leave others needing to chase you up for more
+information. Please try to be as detailed as possible in your report. What is
+your environment? What steps will reproduce the issue? Which environment experience the problem? What would you expect to be the outcome? All these
+details will help people to fix any potential bugs.
+
+Example:
+
+> Short and descriptive example bug report title
+>
+> A summary of the issue and the environment in which it occurs. If
+> suitable, include the steps required to reproduce the bug.
+>
+> 1. This is the first step
+> 2. This is the second step
+> 3. Further steps, etc.
+>
+> `<url>` - a link to the reduced test case
+>
+> Any other information you want to share that is relevant to the issue being
+> reported. This might include the lines of code that you have identified as
+> causing the bug, and potential solutions (and your opinions on their
+> merits).
+
+<a name="features"></a>
+## Feature requests
+
+Feature requests are welcome. But take a moment to find out whether your idea
+fits with the scope and aims of the project. It's up to *you* to make a strong
+case to convince the project's developers of the merits of this feature. Please
+provide as much detail and context as possible.
+
+<a name="pull-requests"></a>
+## Pull requests
+
+Good pull requests - patches, improvements, new features - are a fantastic
+help. They should remain focused in scope and avoid containing unrelated
+commits.
+
+[**Please ask first**](https://ernest.io/community) before embarking on any significant pull request (e.g.
+implementing features, refactoring code, porting to a different language),
+otherwise you risk spending a lot of time working on something that the
+project's developers might not want to merge into the project.
+
+Please adhere to the coding conventions used throughout a project (indentation,
+accurate comments, etc.) and any other requirements (such as test coverage).

documentation/licenses/github.com/r3labs/diff/v3/LICENSE

+Mozilla Public License Version 2.0
+==================================
+
+1. Definitions
+--------------
+
+1.1. "Contributor"
+    means each individual or legal entity that creates, contributes to
+    the creation of, or owns Covered Software.
+
+1.2. "Contributor Version"
+    means the combination of the Contributions of others (if any) used
+    by a Contributor and that particular Contributor's Contribution.
+
+1.3. "Contribution"
+    means Covered Software of a particular Contributor.
+
+1.4. "Covered Software"
+    means Source Code Form to which the initial Contributor has attached
+    the notice in Exhibit A, the Executable Form of such Source Code
+    Form, and Modifications of such Source Code Form, in each case
+    including portions thereof.
+
+1.5. "Incompatible With Secondary Licenses"
+    means
+
+    (a) that the initial Contributor has attached the notice described
+        in Exhibit B to the Covered Software; or
+
+    (b) that the Covered Software was made available under the terms of
+        version 1.1 or earlier of the License, but not also under the
+        terms of a Secondary License.
+
+1.6. "Executable Form"
+    means any form of the work other than Source Code Form.
+
+1.7. "Larger Work"
+    means a work that combines Covered Software with other material, in
+    a separate file or files, that is not Covered Software.
+
+1.8. "License"
+    means this document.
+
+1.9. "Licensable"
+    means having the right to grant, to the maximum extent possible,
+    whether at the time of the initial grant or subsequently, any and
+    all of the rights conveyed by this License.
+
+1.10. "Modifications"
+    means any of the following:
+
+    (a) any file in Source Code Form that results from an addition to,
+        deletion from, or modification of the contents of Covered
+        Software; or
+
+    (b) any new file in Source Code Form that contains any Covered
+        Software.
+
+1.11. "Patent Claims" of a Contributor
+    means any patent claim(s), including without limitation, method,
+    process, and apparatus claims, in any patent Licensable by such
+    Contributor that would be infringed, but for the grant of the
+    License, by the making, using, selling, offering for sale, having
+    made, import, or transfer of either its Contributions or its
+    Contributor Version.
+
+1.12. "Secondary License"
+    means either the GNU General Public License, Version 2.0, the GNU
+    Lesser General Public License, Version 2.1, the GNU Affero General
+    Public License, Version 3.0, or any later versions of those
+    licenses.
+
+1.13. "Source Code Form"
+    means the form of the work preferred for making modifications.
+
+1.14. "You" (or "Your")
+    means an individual or a legal entity exercising rights under this
+    License. For legal entities, "You" includes any entity that
+    controls, is controlled by, or is under common control with You. For
+    purposes of this definition, "control" means (a) the power, direct
+    or indirect, to cause the direction or management of such entity,
+    whether by contract or otherwise, or (b) ownership of more than
+    fifty percent (50%) of the outstanding shares or beneficial
+    ownership of such entity.
+
+2. License Grants and Conditions
+--------------------------------
+
+2.1. Grants
+
+Each Contributor hereby grants You a world-wide, royalty-free,
+non-exclusive license:
+
+(a) under intellectual property rights (other than patent or trademark)
+    Licensable by such Contributor to use, reproduce, make available,
+    modify, display, perform, distribute, and otherwise exploit its
+    Contributions, either on an unmodified basis, with Modifications, or
+    as part of a Larger Work; and
+
+(b) under Patent Claims of such Contributor to make, use, sell, offer
+    for sale, have made, import, and otherwise transfer either its
+    Contributions or its Contributor Version.
+
+2.2. Effective Date
+
+The licenses granted in Section 2.1 with respect to any Contribution
+become effective for each Contribution on the date the Contributor first
+distributes such Contribution.
+
+2.3. Limitations on Grant Scope
+
+The licenses granted in this Section 2 are the only rights granted under
+this License. No additional rights or licenses will be implied from the
+distribution or licensing of Covered Software under this License.
+Notwithstanding Section 2.1(b) above, no patent license is granted by a
+Contributor:
+
+(a) for any code that a Contributor has removed from Covered Software;
+    or
+
+(b) for infringements caused by: (i) Your and any other third party's
+    modifications of Covered Software, or (ii) the combination of its
+    Contributions with other software (except as part of its Contributor
+    Version); or
+
+(c) under Patent Claims infringed by Covered Software in the absence of
+    its Contributions.
+
+This License does not grant any rights in the trademarks, service marks,
+or logos of any Contributor (except as may be necessary to comply with
+the notice requirements in Section 3.4).
+
+2.4. Subsequent Licenses
+
+No Contributor makes additional grants as a result of Your choice to
+distribute the Covered Software under a subsequent version of this
+License (see Section 10.2) or under the terms of a Secondary License (if
+permitted under the terms of Section 3.3).
+
+2.5. Representation
+
+Each Contributor represents that the Contributor believes its
+Contributions are its original creation(s) or it has sufficient rights
+to grant the rights to its Contributions conveyed by this License.
+
+2.6. Fair Use
+
+This License is not intended to limit any rights You have under
+applicable copyright doctrines of fair use, fair dealing, or other
+equivalents.
+
+2.7. Conditions
+
+Sections 3.1, 3.2, 3.3, and 3.4 are conditions of the licenses granted
+in Section 2.1.
+
+3. Responsibilities
+-------------------
+
+3.1. Distribution of Source Form
+
+All distribution of Covered Software in Source Code Form, including any
+Modifications that You create or to which You contribute, must be under
+the terms of this License. You must inform recipients that the Source
+Code Form of the Covered Software is governed by the terms of this
+License, and how they can obtain a copy of this License. You may not
+attempt to alter or restrict the recipients' rights in the Source Code
+Form.
+
+3.2. Distribution of Executable Form
+
+If You distribute Covered Software in Executable Form then:
+
+(a) such Covered Software must also be made available in Source Code
+    Form, as described in Section 3.1, and You must inform recipients of
+    the Executable Form how they can obtain a copy of such Source Code
+    Form by reasonable means in a timely manner, at a charge no more
+    than the cost of distribution to the recipient; and
+
+(b) You may distribute such Executable Form under the terms of this
+    License, or sublicense it under different terms, provided that the
+    license for the Executable Form does not attempt to limit or alter
+    the recipients' rights in the Source Code Form under this License.
+
+3.3. Distribution of a Larger Work
+
+You may create and distribute a Larger Work under terms of Your choice,
+provided that You also comply with the requirements of this License for
+the Covered Software. If the Larger Work is a combination of Covered
+Software with a work governed by one or more Secondary Licenses, and the
+Covered Software is not Incompatible With Secondary Licenses, this
+License permits You to additionally distribute such Covered Software
+under the terms of such Secondary License(s), so that the recipient of
+the Larger Work may, at their option, further distribute the Covered
+Software under the terms of either this License or such Secondary
+License(s).
+
+3.4. Notices
+
+You may not remove or alter the substance of any license notices
+(including copyright notices, patent notices, disclaimers of warranty,
+or limitations of liability) contained within the Source Code Form of
+the Covered Software, except that You may alter any license notices to
+the extent required to remedy known factual inaccuracies.
+
+3.5. Application of Additional Terms
+
+You may choose to offer, and to charge a fee for, warranty, support,
+indemnity or liability obligations to one or more recipients of Covered
+Software. However, You may do so only on Your own behalf, and not on
+behalf of any Contributor. You must make it absolutely clear that any
+such warranty, support, indemnity, or liability obligation is offered by
+You alone, and You hereby agree to indemnify every Contributor for any
+liability incurred by such Contributor as a result of warranty, support,
+indemnity or liability terms You offer. You may include additional
+disclaimers of warranty and limitations of liability specific to any
+jurisdiction.
+
+4. Inability to Comply Due to Statute or Regulation
+---------------------------------------------------
+
+If it is impossible for You to comply with any of the terms of this
+License with respect to some or all of the Covered Software due to
+statute, judicial order, or regulation then You must: (a) comply with
+the terms of this License to the maximum extent possible; and (b)
+describe the limitations and the code they affect. Such description must
+be placed in a text file included with all distributions of the Covered
+Software under this License. Except to the extent prohibited by statute
+or regulation, such description must be sufficiently detailed for a
+recipient of ordinary skill to be able to understand it.
+
+5. Termination
+--------------
+
+5.1. The rights granted under this License will terminate automatically
+if You fail to comply with any of its terms. However, if You become
+compliant, then the rights granted under this License from a particular
+Contributor are reinstated (a) provisionally, unless and until such
+Contributor explicitly and finally terminates Your grants, and (b) on an
+ongoing basis, if such Contributor fails to notify You of the
+non-compliance by some reasonable means prior to 60 days after You have
+come back into compliance. Moreover, Your grants from a particular
+Contributor are reinstated on an ongoing basis if such Contributor
+notifies You of the non-compliance by some reasonable means, this is the
+first time You have received notice of non-compliance with this License
+from such Contributor, and You become compliant prior to 30 days after
+Your receipt of the notice.
+
+5.2. If You initiate litigation against any entity by asserting a patent
+infringement claim (excluding declaratory judgment actions,
+counter-claims, and cross-claims) alleging that a Contributor Version
+directly or indirectly infringes any patent, then the rights granted to
+You by any and all Contributors for the Covered Software under Section
+2.1 of this License shall terminate.
+
+5.3. In the event of termination under Sections 5.1 or 5.2 above, all
+end user license agreements (excluding distributors and resellers) which
+have been validly granted by You or Your distributors under this License
+prior to termination shall survive termination.
+
+************************************************************************
+*                                                                      *
+*  6. Disclaimer of Warranty                                           *
+*  -------------------------                                           *
+*                                                                      *
+*  Covered Software is provided under this License on an "as is"       *
+*  basis, without warranty of any kind, either expressed, implied, or  *
+*  statutory, including, without limitation, warranties that the       *
+*  Covered Software is free of defects, merchantable, fit for a        *
+*  particular purpose or non-infringing. The entire risk as to the     *
+*  quality and performance of the Covered Software is with You.        *
+*  Should any Covered Software prove defective in any respect, You     *
+*  (not any Contributor) assume the cost of any necessary servicing,   *
+*  repair, or correction. This disclaimer of warranty constitutes an   *
+*  essential part of this License. No use of any Covered Software is   *
+*  authorized under this License except under this disclaimer.         *
+*                                                                      *
+************************************************************************
+
+************************************************************************
+*                                                                      *
+*  7. Limitation of Liability                                          *
+*  --------------------------                                          *
+*                                                                      *
+*  Under no circumstances and under no legal theory, whether tort      *
+*  (including negligence), contract, or otherwise, shall any           *
+*  Contributor, or anyone who distributes Covered Software as          *
+*  permitted above, be liable to You for any direct, indirect,         *
+*  special, incidental, or consequential damages of any character      *
+*  including, without limitation, damages for lost profits, loss of    *
+*  goodwill, work stoppage, computer failure or malfunction, or any    *
+*  and all other commercial damages or losses, even if such party      *
+*  shall have been informed of the possibility of such damages. This   *
+*  limitation of liability shall not apply to liability for death or   *
+*  personal injury resulting from such party's negligence to the       *
+*  extent applicable law prohibits such limitation. Some               *
+*  jurisdictions do not allow the exclusion or limitation of           *
+*  incidental or consequential damages, so this exclusion and          *
+*  limitation may not apply to You.                                    *
+*                                                                      *
+************************************************************************
+
+8. Litigation
+-------------
+
+Any litigation relating to this License may be brought only in the
+courts of a jurisdiction where the defendant maintains its principal
+place of business and such litigation shall be governed by laws of that
+jurisdiction, without reference to its conflict-of-law provisions.
+Nothing in this Section shall prevent a party's ability to bring
+cross-claims or counter-claims.
+
+9. Miscellaneous
+----------------
+
+This License represents the complete agreement concerning the subject
+matter hereof. If any provision of this License is held to be
+unenforceable, such provision shall be reformed only to the extent
+necessary to make it enforceable. Any law or regulation which provides
+that the language of a contract shall be construed against the drafter
+shall not be used to construe this License against a Contributor.
+
+10. Versions of the License
+---------------------------
+
+10.1. New Versions
+
+Mozilla Foundation is the license steward. Except as provided in Section
+10.3, no one other than the license steward has the right to modify or
+publish new versions of this License. Each version will be given a
+distinguishing version number.
+
+10.2. Effect of New Versions
+
+You may distribute the Covered Software under the terms of the version
+of the License under which You originally received the Covered Software,
+or under the terms of any subsequent version published by the license
+steward.
+
+10.3. Modified Versions
+
+If you create software not governed by this License, and you want to
+create a new license for such software, you may create and use a
+modified version of this License if you rename the license and remove
+any references to the name of the license steward (except to note that
+such modified license differs from this License).
+
+10.4. Distributing Source Code Form that is Incompatible With Secondary
+Licenses
+
+If You choose to distribute Source Code Form that is Incompatible With
+Secondary Licenses under the terms of this version of the License, the
+notice described in Exhibit B of this License must be attached.
+
+Exhibit A - Source Code Form License Notice
+-------------------------------------------
+
+  This Source Code Form is subject to the terms of the Mozilla Public
+  License, v. 2.0. If a copy of the MPL was not distributed with this
+  file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+If it is not possible or desirable to put the notice in a particular
+file, then You may include the notice in a location (such as a LICENSE
+file in a relevant directory) where a recipient would be likely to look
+for such a notice.
+
+You may add additional accurate notices of copyright ownership.
+
+Exhibit B - "Incompatible With Secondary Licenses" Notice
+---------------------------------------------------------
+
+  This Source Code Form is "Incompatible With Secondary Licenses", as
+  defined by the Mozilla Public License, v. 2.0.

documentation/licenses/github.com/r3labs/diff/v3/Makefile

+install:
+	go install -v ${LDFLAGS}
+
+deps:
+	go get github.com/stretchr/testify
+
+test:
+	@go test -v -cover ./...
+
+cover:
+	@go test -coverprofile cover.out

documentation/licenses/github.com/r3labs/diff/v3/README.md

+# Diff [![PkgGoDev](https://pkg.go.dev/badge/github.com/r3labs/diff)](https://pkg.go.dev/github.com/r3labs/diff) [![Go Report Card](https://goreportcard.com/badge/github.com/r3labs/diff)](https://goreportcard.com/report/github.com/r3labs/diff) [![Build Status](https://travis-ci.com/r3labs/diff.svg?branch=master)](https://travis-ci.com/r3labs/diff)
+
+A library for diffing golang structures and values.
+
+Utilizing field tags and reflection, it is able to compare two structures of the same type and create a changelog of all modified values. The produced changelog can easily be serialized to json.
+
+NOTE: All active development now takes place on the v3 branch.
+
+## Installation
+
+For version 3:
+```
+go get github.com/r3labs/diff/v3
+```
+
+## Changelog Format
+
+When diffing two structures using `Diff`, a changelog will be produced. Any detected changes will populate the changelog array with a Change type:
+
+```go
+type Change struct {
+	Type string      // The type of change detected; can be one of create, update or delete
+	Path []string    // The path of the detected change; will contain any field name or array index that was part of the traversal
+	From interface{} // The original value that was present in the "from" structure
+	To   interface{} // The new value that was detected as a change in the "to" structure
+}
+```
+
+Given the example below, we are diffing two slices where the third element has been removed:
+
+```go
+from := []int{1, 2, 3, 4}
+to := []int{1, 2, 4}
+
+changelog, _ := diff.Diff(from, to)
+```
+
+The resultant changelog should contain one change:
+
+```go
+Change{
+    Type: "delete",
+    Path: ["2"],
+    From: 3,
+    To:   nil,
+}
+```
+
+## Supported Types
+
+A diffable value can be/contain any of the following types:
+
+
+| Type         | Supported |
+| ------------ | --------- |
+| struct       | ✔         |
+| slice        | ✔         |
+| string       | ✔         |
+| int          | ✔         |
+| bool         | ✔         |
+| map          | ✔         |
+| pointer      | ✔         |
+| custom types | ✔         |
+
+
+Please see the docs for more supported types, options and features.
+
+### Tags
+
+In order for struct fields to be compared, they must be tagged with a given name. All tag values are prefixed with `diff`. i.e. `diff:"items"`.
+
+| Tag           | Usage                                                                                                                                                                                                                                                                                           |
+| ------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
+| `-`           | Excludes a value from being diffed                                                                                                                                                                                                                                                              |
+| `identifier`  | If you need to compare arrays by a matching identifier and not based on order, you can specify the `identifier` tag. If an identifiable element is found in both the from and to structures, they will be directly compared. i.e. `diff:"name, identifier"`                                     |
+| `immutable`   | Will omit this struct field from diffing. When using `diff.StructValues()` these values will be added to the returned changelog. It's use case is for when we have nothing to compare a struct to and want to show all of its relevant values.                                                  |
+| `nocreate`    | The default patch action is to allocate instances in the target strut, map or slice should they not exist. Adding this flag will tell patch to skip elements that it would otherwise need to allocate. This is separate from immutable, which is also honored while patching.                   |
+| `omitunequal` | Patching is a 'best effort' operation, and will by default attempt to update the 'correct' member of the target even if the underlying value has already changed to something other than the value in the change log 'from'. This tag will selectively ignore values that are not a 100% match. |
+
+## Usage
+
+### Basic Example
+
+Diffing a basic set of values can be accomplished using the diff functions. Any items that specify a "diff" tag using a name will be compared.
+
+```go
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+    ID    string `diff:"id"`
+    Items []int  `diff:"items"`
+}
+
+func main() {
+    a := Order{
+        ID: "1234",
+        Items: []int{1, 2, 3, 4},
+    }
+
+    b := Order{
+        ID: "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    changelog, err := diff.Diff(a, b)
+    ...
+}
+```
+
+In this example, the output generated in the changelog will indicate that the third element with a value of '3' was removed from items.
+When marshalling the changelog to json, the output will look like:
+
+```json
+[
+    {
+        "type": "delete",
+        "path": ["items", "2"],
+        "from": 3,
+        "to": null
+    }
+]
+```
+
+### Options and Configuration
+
+Options can be set on the differ at call time which effect how diff acts when building the change log.
+```go
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+    ID    string `diff:"id"`
+    Items []int  `diff:"items"`
+}
+
+func main() {
+    a := Order{
+        ID: "1234",
+        Items: []int{1, 2, 3, 4},
+    }
+
+    b := Order{
+        ID: "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    changelog, err := diff.Diff(a, b, diff.DisableStructValues(), diff.AllowTypeMismatch(true))
+    ...
+}
+```
+
+You can also create a new instance of a differ that allows options to be set.
+
+```go
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+    ID    string `diff:"id"`
+    Items []int  `diff:"items"`
+}
+
+func main() {
+    a := Order{
+        ID: "1234",
+        Items: []int{1, 2, 3, 4},
+    }
+
+    b := Order{
+        ID: "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    d, err := diff.NewDiffer(diff.SliceOrdering(true))
+    if err != nil {
+        panic(err)
+    }
+
+    changelog, err := d.Diff(a, b)
+    ...
+}
+```
+
+Supported options are:
+
+`SliceOrdering` ensures that the ordering of items in a slice is taken into account
+
+`DiscardComplexOrigin` is a directive to diff to omit additional origin information about structs. This alters the behavior of patch and can lead to some pitfalls and non-intuitive behavior if used. On the other hand, it can significantly reduce the memory footprint of large complex diffs.
+
+`AllowTypeMismatch` is a global directive to either allow (true) or not to allow (false) patch apply the changes if 'from' is not equal. This is effectively a global version of the omitunequal tag.
+
+`Filter` provides a callback that allows you to determine which fields the differ descends into
+
+`DisableStructValues` disables populating a separate change for each item in a struct, where the struct is being compared to a nil Value.
+
+`TagName` sets the tag name to use when getting field names and options.
+
+### Patch and merge support
+Diff additionally supports merge and patch. Similar in concept to text patching / merging the Patch function, given 
+a change log and a target instance will make a _best effort_ to apply the changes in the change log to the variable
+pointed to. The intention is that the target pointer is of the same type however, that doesn't necessarily have to be 
+true. For example, two slices of differing structs may be similar enough to apply changes to in a polymorphic way, and 
+patch will certainly try.
+
+The patch function doesn't actually fail, and even if there are errors, it may succeed sufficiently for the task at hand.
+To accommodate this patch keeps track of each change log option it attempts to apply and reports the details of what 
+happened for further scrutiny.
+
+```go
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+    ID    string `diff:"id"`
+    Items []int  `diff:"items"`
+}
+
+func main() {
+    a := Order{
+        ID: "1234",
+        Items: []int{1, 2, 3, 4},
+    }
+
+    b := Order{
+        ID: "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    c := Order{}
+    changelog, err := diff.Diff(a, b)
+
+    patchlog := diff.Patch(changelog, &c)
+    //Note the lack of an error. Patch is best effort and uses flags to indicate actions taken
+    //and keeps any errors encountered along the way for review
+    fmt.Printf("Encountered %d errors while patching", patchlog.ErrorCount())
+    ...
+}
+```
+
+Instances of differ with options set can also be used when patching.
+
+```go
+package main
+
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+	ID    string `json:"id"`
+	Items []int  `json:"items"`
+}
+
+func main() {
+    a := Order{
+        ID:    "1234",
+        Items: []int{1, 2, 3, 4},
+        }
+
+    b := Order{
+        ID:    "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    d, _ := diff.NewDiffer(diff.TagName("json"))
+
+    changelog, _ := d.Diff(a, b)
+
+    d.Patch(changelog, &a)
+    // reflect.DeepEqual(a, b) == true
+}
+
+```
+
+As a convenience, there is a Merge function that allows one to take three interfaces and perform all the tasks at the same
+time.
+
+```go
+import "github.com/r3labs/diff/v3"
+
+type Order struct {
+    ID    string `diff:"id"`
+    Items []int  `diff:"items"`
+}
+
+func main() {
+    a := Order{
+        ID: "1234",
+        Items: []int{1, 2, 3, 4},
+    }
+
+    b := Order{
+        ID: "1234",
+        Items: []int{1, 2, 4},
+    }
+
+    c := Order{}
+    patchlog, err := diff.Merge(a, b, &c)
+    if err != nil {
+        fmt.Printf("Error encountered while diffing a & b")
+    }
+    fmt.Printf("Encountered %d errors while patching", patchlog.ErrorCount())
+    ...
+}
+```
+## Running Tests
+
+```
+make test
+```
+
+## Contributing
+
+Please read through our
+[contributing guidelines](CONTRIBUTING.md).
+Included are directions for opening issues, coding standards, and notes on
+development.
+
+Moreover, if your pull request contains patches or features, you must include
+relevant unit tests.
+
+## Versioning
+
+For transparency into our release cycle and in striving to maintain backward
+compatibility, this project is maintained under [the Semantic Versioning guidelines](http://semver.org/).
+
+## Copyright and License
+
+Code and documentation copyright since 2015 r3labs.io authors.
+
+Code released under
+[the Mozilla Public License Version 2.0](LICENSE).

documentation/licenses/github.com/r3labs/diff/v3/change_value.go

+package diff
+
+import (
+	"fmt"
+	"reflect"
+)
+
+//ChangeValue is a specialized struct for monitoring patching
+type ChangeValue struct {
+	parent *reflect.Value
+	target *reflect.Value
+	flags  PatchFlags
+	change *Change
+	err    error
+	pos    int
+	index  int
+	key    reflect.Value
+}
+
+//swap swaps out the target as we move down the path. Note that a nil
+//     check is foregone here due to the fact we control usage.
+func (c *ChangeValue) swap(newTarget *reflect.Value) {
+	if newTarget.IsValid() {
+		c.ClearFlag(FlagInvalidTarget)
+		c.parent = c.target
+		c.target = newTarget
+		c.pos++
+	}
+}
+
+// Sets a flag on the node and saves the change
+func (c *ChangeValue) SetFlag(flag PatchFlags) {
+	if c != nil {
+		c.flags = c.flags | flag
+	}
+}
+
+//ClearFlag removes just a single flag
+func (c *ChangeValue) ClearFlag(flag PatchFlags) {
+	if c != nil {
+		c.flags = c.flags &^ flag
+	}
+}
+
+//HasFlag indicates if a flag is set on the node. returns false if node is bad
+func (c *ChangeValue) HasFlag(flag PatchFlags) bool {
+	return (c.flags & flag) != 0
+}
+
+//IsValid echo for is valid
+func (c *ChangeValue) IsValid() bool {
+	if c != nil {
+		return c.target.IsValid() || !c.HasFlag(FlagInvalidTarget)
+	}
+	return false
+}
+
+//ParentKind - helps keep us nil safe
+func (c ChangeValue) ParentKind() reflect.Kind {
+	if c.parent != nil {
+		return c.parent.Kind()
+	}
+	return reflect.Invalid
+}
+
+//ParentLen is a nil safe parent length check
+func (c ChangeValue) ParentLen() (ret int) {
+	if c.parent != nil &&
+		(c.parent.Kind() == reflect.Slice ||
+			c.parent.Kind() == reflect.Map) {
+		ret = c.parent.Len()
+	}
+	return
+}
+
+//ParentSet - nil safe parent set
+func (c *ChangeValue) ParentSet(value reflect.Value, convertCompatibleTypes bool) {
+	if c != nil && c.parent != nil {
+		defer func() {
+			if r := recover(); r != nil {
+				c.SetFlag(FlagParentSetFailed)
+			}
+		}()
+
+		if convertCompatibleTypes {
+			if !value.Type().ConvertibleTo(c.parent.Type()) {
+				c.AddError(fmt.Errorf("Value of type %s is not convertible to %s", value.Type().String(), c.parent.Type().String()))
+				c.SetFlag(FlagParentSetFailed)
+				return
+			}
+			c.parent.Set(value.Convert(c.parent.Type()))
+		} else {
+			c.parent.Set(value)
+		}
+		c.SetFlag(FlagParentSetApplied)
+	}
+}
+
+//Len echo for len
+func (c ChangeValue) Len() int {
+	return c.target.Len()
+}
+
+//Set echos reflect set
+func (c *ChangeValue) Set(value reflect.Value, convertCompatibleTypes bool) {
+	if c == nil {
+		return
+	}
+
+	defer func() {
+		if r := recover(); r != nil {
+			switch e := r.(type) {
+			case string:
+				c.AddError(NewError(e))
+			case *reflect.ValueError:
+				c.AddError(NewError(e.Error()))
+			}
+
+			c.SetFlag(FlagFailed)
+		}
+	}()
+
+	if c.HasFlag(OptionImmutable) {
+		c.SetFlag(FlagIgnored)
+		return
+	}
+
+	if convertCompatibleTypes {
+		if c.target.Kind() == reflect.Ptr && value.Kind() != reflect.Ptr {
+			if !value.IsValid() {
+				c.target.Set(reflect.Zero(c.target.Type()))
+				c.SetFlag(FlagApplied)
+				return
+			} else if !value.Type().ConvertibleTo(c.target.Elem().Type()) {
+				c.AddError(fmt.Errorf("Value of type %s is not convertible to %s", value.Type().String(), c.target.Type().String()))
+				c.SetFlag(FlagFailed)
+				return
+			}
+
+			tv := reflect.New(c.target.Elem().Type())
+			tv.Elem().Set(value.Convert(c.target.Elem().Type()))
+			c.target.Set(tv)
+		} else {
+			if !value.Type().ConvertibleTo(c.target.Type()) {
+				c.AddError(fmt.Errorf("Value of type %s is not convertible to %s", value.Type().String(), c.target.Type().String()))
+				c.SetFlag(FlagFailed)
+				return
+			}
+
+			c.target.Set(value.Convert(c.target.Type()))
+		}
+	} else {
+		if value.IsValid() {
+			if c.target.Kind() == reflect.Ptr && value.Kind() != reflect.Ptr {
+				tv := reflect.New(value.Type())
+				tv.Elem().Set(value)
+				c.target.Set(tv)
+			} else {
+				c.target.Set(value)
+			}
+		} else if c.target.Kind() == reflect.Ptr {
+			c.target.Set(reflect.Zero(c.target.Type()))
+		} else if !c.target.IsZero() {
+			t := c.target.Elem()
+			t.Set(reflect.Zero(t.Type()))
+		}
+	}
+	c.SetFlag(FlagApplied)
+}
+
+//Index echo for index
+func (c ChangeValue) Index(i int) reflect.Value {
+	return c.target.Index(i)
+}
+
+//ParentIndex - get us the parent version, nil safe
+func (c ChangeValue) ParentIndex(i int) (ret reflect.Value) {
+	if c.parent != nil {
+		ret = c.parent.Index(i)
+	}
+	return
+}
+
+//Instance a new element of type for target. Taking the
+//copy of the complex origin avoids the 'lack of data' issue
+//present when allocating complex structs with slices and
+//arrays
+func (c ChangeValue) NewElement() reflect.Value {
+	ret := c.change.parent
+	if ret != nil {
+		return reflect.ValueOf(ret)
+	}
+	return reflect.New(c.target.Type().Elem()).Elem()
+}
+
+//NewArrayElement gives us a dynamically typed new element
+func (c ChangeValue) NewArrayElement() reflect.Value {
+	c.target.Set(reflect.Append(*c.target, c.NewElement()))
+	c.SetFlag(FlagCreated)
+	return c.Index(c.Len() - 1)
+}
+
+//AddError appends errors to this change value
+func (c *ChangeValue) AddError(err error) *ChangeValue {
+	if c != nil {
+		c.err = err
+	}
+	return c
+}

documentation/licenses/github.com/r3labs/diff/v3/comparative.go

+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package diff
+
+import (
+	"reflect"
+)
+
+// Comparative ...
+type Comparative struct {
+	A, B *reflect.Value
+}
+
+// ComparativeList : stores indexed comparative
+type ComparativeList struct {
+	m    map[interface{}]*Comparative
+	keys []interface{}
+}
+
+// NewComparativeList : returns a new comparative list
+func NewComparativeList() *ComparativeList {
+	return &ComparativeList{
+		m:    make(map[interface{}]*Comparative),
+		keys: make([]interface{}, 0),
+	}
+}
+
+func (cl *ComparativeList) addA(k interface{}, v *reflect.Value) {
+	if (*cl).m[k] == nil {
+		(*cl).m[k] = &Comparative{}
+		(*cl).keys = append((*cl).keys, k)
+	}
+	(*cl).m[k].A = v
+}
+
+func (cl *ComparativeList) addB(k interface{}, v *reflect.Value) {
+	if (*cl).m[k] == nil {
+		(*cl).m[k] = &Comparative{}
+		(*cl).keys = append((*cl).keys, k)
+	}
+	(*cl).m[k].B = v
+}