feat(spec): version field (#85)

Adds a `version` field to the `jsonnetfile.json`, so that `jb` can automatically recognize too old / too new schema versions, instead of panicking.

spec/spec.go

@@ -1,83 +0,0 @@
-// Copyright 2018 jsonnet-bundler authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-package spec
-
-import (
-	"encoding/json"
-	"sort"
-
-	"github.com/jsonnet-bundler/jsonnet-bundler/spec/deps"
-)
-
-// JsonnetFile is the structure of a `.json` file describing a set of jsonnet
-// dependencies. It is used for both, the jsonnetFile and the lockFile.
-type JsonnetFile struct {
-	// List of dependencies
-	Dependencies map[string]deps.Dependency
-
-	// Symlink files to old location
-	LegacyImports bool
-}
-
-// New returns a new JsonnetFile with the dependencies map initialized
-func New() JsonnetFile {
-	return JsonnetFile{
-		Dependencies:  make(map[string]deps.Dependency),
-		LegacyImports: true,
-	}
-}
-
-// jsonFile is the json representation of a JsonnetFile, which is different for
-// compatibility reasons.
-type jsonFile struct {
-	Dependencies  []deps.Dependency `json:"dependencies"`
-	LegacyImports bool              `json:"legacyImports"`
-}
-
-// UnmarshalJSON unmarshals a `jsonFile`'s json into a JsonnetFile
-func (jf *JsonnetFile) UnmarshalJSON(data []byte) error {
-	var s jsonFile
-	s.LegacyImports = jf.LegacyImports // adpot default
-
-	if err := json.Unmarshal(data, &s); err != nil {
-		return err
-	}
-
-	jf.Dependencies = make(map[string]deps.Dependency)
-	for _, d := range s.Dependencies {
-		jf.Dependencies[d.Name()] = d
-	}
-	jf.LegacyImports = s.LegacyImports
-	return nil
-}
-
-// MarshalJSON serializes a JsonnetFile into json of the format of a `jsonFile`
-func (jf JsonnetFile) MarshalJSON() ([]byte, error) {
-	var s jsonFile
-	s.LegacyImports = jf.LegacyImports
-	for _, d := range jf.Dependencies {
-		s.Dependencies = append(s.Dependencies, d)
-	}
-
-	sort.SliceStable(s.Dependencies, func(i int, j int) bool {
-		return s.Dependencies[i].Name() < s.Dependencies[j].Name()
-	})
-
-	if s.Dependencies == nil {
-		s.Dependencies = make([]deps.Dependency, 0, 0)
-	}
-
-	return json.Marshal(s)
-}