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package formula
import (
"archive/zip"
"io"
"io/ioutil"
"os"
"path/filepath"
)
// ReadDir returns a Dir representing an expanded formula directory.
func ReadDir(path string) (dir *Dir, err os.Error) {
dir = &Dir{Path: path}
file, err := os.Open(dir.join("metadata.yaml"))
if err != nil {
return nil, err
}
dir.meta, err = ReadMeta(file)
file.Close()
if err != nil {
return nil, err
}
file, err = os.Open(dir.join("config.yaml"))
if err != nil {
return nil, err
}
dir.config, err = ReadConfig(file)
file.Close()
if err != nil {
return nil, err
}
return dir, nil
}
// The Dir type encapsulates access to data and operations
// on a formula directory.
type Dir struct {
Path string
meta *Meta
config *Config
}
// Trick to ensure Dir implements the Formula interface.
var _ Formula = (*Dir)(nil)
// Meta returns the Meta representing the metadata.yaml file
// for the formula expanded in dir.
func (dir *Dir) Meta() *Meta {
return dir.meta
}
// Config returns the Config representing the config.yaml file
// for the formula expanded in dir.
func (dir *Dir) Config() *Config {
return dir.config
}
// BundleTo creates a formula file from the formula expanded in dir.
func (dir *Dir) BundleTo(w io.Writer) (err os.Error) {
zipw := zip.NewWriter(w)
defer func() {
zipw.Close()
handleZipError(&err)
}()
visitor := zipVisitor{zipw, dir.Path}
walk(dir.Path, &visitor)
return nil
}
type zipVisitor struct {
*zip.Writer
root string
}
func (zipw *zipVisitor) VisitDir(path string, f *os.FileInfo) bool {
relpath, err := filepath_Rel(zipw.root, path)
zipw.Error(path, err)
return relpath != "build"
}
func (zipw *zipVisitor) VisitFile(path string, f *os.FileInfo) {
relpath, err := filepath_Rel(zipw.root, path)
zipw.Error(path, err)
w, err := zipw.Create(relpath)
zipw.Error(path, err)
data, err := ioutil.ReadFile(path)
zipw.Error(path, err)
_, err = w.Write(data)
zipw.Error(path, err)
}
type zipError os.Error
func (zipw *zipVisitor) Error(path string, err os.Error) {
if err != nil {
panic(zipError(err))
}
}
func handleZipError(err *os.Error) {
if *err != nil {
return // Do not override a previous problem
}
panicv := recover()
if panicv == nil {
return
}
if e, ok := panicv.(zipError); ok {
*err = (os.Error)(e)
return
}
panic(panicv) // Something else
}
// join builds a path rooted at the formula's expended directory
// path and the extra path components provided.
func (dir *Dir) join(parts ...string) string {
parts = append([]string{dir.Path}, parts...)
return filepath.Join(parts...)
}
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