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dev.go
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dev.go
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package app
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
)
// DevDep has information about an upstream dependency that should be
// used by the Dev function in order to build a complete development
// environment.
type DevDep struct {
// Files is a list of files that this dependency created or uses.
// If these files already exist, then future DevDep calls won't be
// called and the cached data will be used.
//
// All files in this must be in the Context.CacheDir. Relative paths
// will be expanded relative to the CacheDir. If the file is not
// in the CacheDir, no caching will occur. The log will note if this
// is happening.
Files []string `json:"files"`
}
// RelFiles makes all the Files values relative to the given directory.
func (d *DevDep) RelFiles(dir string) error {
for i, f := range d.Files {
// If the path is already relative, ignore it
if !filepath.IsAbs(f) {
continue
}
// Make the path relative
f, err := filepath.Rel(dir, f)
if err != nil {
return fmt.Errorf(
"couldn't make directory relative: %s\n\n%s",
d.Files[i], err)
}
d.Files[i] = f
}
return nil
}
// ReadDevDep reads a marshalled DevDep from disk.
func ReadDevDep(path string) (*DevDep, error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer f.Close()
var result DevDep
dec := json.NewDecoder(f)
if err := dec.Decode(&result); err != nil {
return nil, err
}
return &result, nil
}
// WriteDevDep writes a DevDep out to disk.
func WriteDevDep(path string, dep *DevDep) error {
// Pretty-print the JSON data so that it can be more easily inspected
data, err := json.MarshalIndent(dep, "", " ")
if err != nil {
return err
}
// Write it out
f, err := os.Create(path)
if err != nil {
return err
}
defer f.Close()
_, err = io.Copy(f, bytes.NewReader(data))
return err
}