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main.go
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main.go
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// Copyright 2024 cuegen 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 cuegen
import (
"fmt"
"os"
"regexp"
"cuelang.org/go/cue"
"cuelang.org/go/cue/cuecontext"
"cuelang.org/go/cue/load"
"cuelang.org/go/pkg/encoding/yaml"
)
const cuegenMergeObjects = "cuegen_generated_merge_objects"
var cuegenProcessComment = regexp.MustCompile("(?m)^//cuegen: process$")
func (c Cuegen) Exec() error {
// new empty directory
emptyDir, err := os.MkdirTemp("", "cuegen-")
if err != nil {
return err
}
defer os.RemoveAll(emptyDir)
cwd, err := os.Getwd()
if err != nil {
return err
}
os.Chdir(emptyDir)
defer os.Chdir(cwd)
// load component overlays
cfg, err := c.buildLoadConfig(emptyDir)
if err != nil {
return fmt.Errorf("Exec: %v", err)
}
// only load one instance
instance := load.Instances([]string{"."}, cfg)[0]
if instance.Err != nil {
return fmt.Errorf("exec: load instance: %v", instance.Err)
}
ctx := cuecontext.New()
value := ctx.BuildInstance(instance)
if value.Err() != nil {
return fmt.Errorf("exec: build instance: %v", value.Err())
}
// get objects for output
objects := value.LookupPath(cue.ParsePath(cuegenMergeObjects))
if objects.Err() != nil {
return fmt.Errorf("exec: LookupPath: %v", objects.Err())
}
// dump objects to yaml
yamlString, err := yaml.MarshalStream(objects)
if err != nil {
return fmt.Errorf("Exec: marshal stream: %v", err)
}
fixedYamlString := removeBinaryPrefix(yamlString)
c.Output.Write([]byte(fixedYamlString))
return nil
}