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package main
import (
"errors"
"fmt"
"io"
"os"
"os/exec"
"os/user"
"path/filepath"
"runtime"
"strings"
)
// use `go get` to download addon and add to $GOPATH/src, useful
// for IDE auto-import and code completion, then copy entire directory
// tree to project's ./addons folder
func getAddon(args []string) error {
var cmdOptions []string
var addonPath = args[1]
// Go get
cmdOptions = append(cmdOptions, "get", addonPath)
get := exec.Command(gocmd, cmdOptions...)
get.Stderr = os.Stderr
get.Stdout = os.Stdout
err := get.Start()
if err != nil {
return addError(err)
}
err = get.Wait()
if err != nil {
return addError(err)
}
// copy to ./addons folder
// resolve GOPATH
gopath, err := getGOPATH()
if err != nil {
return addError(err)
}
pwd, err := os.Getwd()
if err != nil {
return addError(err)
}
src := filepath.Join(gopath, "src", addonPath)
// Need to strip the addon name for copyAll?
last := filepath.Base(addonPath)
dest := filepath.Join(pwd, "addons", strings.Replace(addonPath, last, "", 1))
err = replicateAll(src, dest)
if err != nil {
return addError(err)
}
return nil
}
// resolve GOPATH. In 1.8 can be default, or custom. A custom GOPATH can
// also contain multiple paths, in which case 'go get' uses the first
func getGOPATH() (string, error) {
var gopath string
gopath = os.Getenv("GOPATH")
if gopath == "" {
// not set, find the default
usr, err := user.Current()
if err != nil {
return gopath, err
}
gopath = filepath.Join(usr.HomeDir, "go")
} else {
// parse out in case of multiple, retain first
if runtime.GOOS == "windows" {
gopaths := strings.Split(gopath, ";")
gopath = gopaths[0]
} else {
gopaths := strings.Split(gopath, ":")
gopath = gopaths[0]
}
}
return gopath, nil
}
// this is distinct from copyAll() in that files are copied, not moved,
// since we also need them to remain in $GOPATH/src
// thanks to @markc of stack overflow for the copyFile and copyFileContents functions
func replicateAll(src, dst string) error {
err := filepath.Walk(src, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
sep := string(filepath.Separator)
// base == the ponzu project dir + string(filepath.Separator)
parts := strings.Split(src, sep)
base := strings.Join(parts[:len(parts)-1], sep)
base += sep
target := filepath.Join(dst, path[len(base):])
// if its a directory, make dir in dst
if info.IsDir() {
err := os.MkdirAll(target, os.ModeDir|os.ModePerm)
if err != nil {
return err
}
} else {
// if its a file, copy file to dir of dst
err = copyFile(path, target)
if err != nil {
return err
}
}
return nil
})
if err != nil {
return err
}
return nil
}
// copyFile copies a file from src to dst. if src and dst files exist, and are
// the same, then return success. Otherise, attempt to create a hard link
// between the two files. If that fail, copy the file contents from src to dst.
// thanks to Stack Overflow
func copyFile(src, dst string) (err error) {
sfi, err := os.Stat(src)
if err != nil {
return
}
if !sfi.Mode().IsRegular() {
// cannot copy non-regular files (e.g., directories,
// symlinks, devices, etc.)
return fmt.Errorf("CopyFile: non-regular source file %s (%q)", sfi.Name(), sfi.Mode().String())
}
dfi, err := os.Stat(dst)
if err != nil {
if !os.IsNotExist(err) {
return
}
} else {
if !(dfi.Mode().IsRegular()) {
return fmt.Errorf("CopyFile: non-regular destination file %s (%q)", dfi.Name(), dfi.Mode().String())
}
if os.SameFile(sfi, dfi) {
return
}
}
if err = os.Link(src, dst); err == nil {
return
}
err = copyFileContents(src, dst)
return
}
// copyFileContents copies the contents of the file named src to the file named
// by dst. The file will be created if it does not already exist. If the
// destination file exists, all it's contents will be replaced by the contents
// of the source file.
// Thanks for Stack Overflow
func copyFileContents(src, dst string) (err error) {
in, err := os.Open(src)
if err != nil {
return
}
defer in.Close()
out, err := os.Create(dst)
if err != nil {
return
}
defer func() {
cerr := out.Close()
if err == nil {
err = cerr
}
}()
if _, err = io.Copy(out, in); err != nil {
return
}
err = out.Sync()
return
}
// generic error return
func addError(err error) error {
return errors.New("Ponzu add failed. " + "\n" + err.Error())
}
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