// Setup configures a *build.Context to use the given VFS
// as its filesystem.
func Setup(ctx *build.Context, fs vfs.VFS) {
ctx.JoinPath = path.Join
ctx.SplitPathList = filepath.SplitList
ctx.IsAbsPath = func(p string) bool {
return p != "" && p[0] == '/'
}
ctx.IsDir = func(p string) bool {
stat, err := fs.Stat(p)
return err == nil && stat.IsDir()
}
ctx.HasSubdir = func(root, dir string) (string, bool) {
root = path.Clean(root)
if !strings.HasSuffix(root, separator) {
root += separator
}
dir = path.Clean(dir)
if !strings.HasPrefix(dir, root) {
return "", false
}
return dir[len(root):], true
}
ctx.ReadDir = fs.ReadDir
ctx.OpenFile = func(p string) (io.ReadCloser, error) {
return fs.Open(p)
}
}
