package instruction import ( "fmt" "git.xdrm.io/go/nix-amer/internal/cnf" "os" "strings" ) var ErrImpossible = fmt.Errorf("cannot update configuration") type config struct { raw string // File is the path to the file File string // Path is the configuration field path Path string // Value if the value to add or update Value string // Format is the configuration format in use Format *cnf.ConfigurationFormat } func (d *config) Raw() string { return d.raw } func (d *config) Build(_args string) error { // 1. extract action (sub command) split := strings.Fields(_args) // 2. check path if len(split) < 2 { return fmt.Errorf("missing configuration path") } path := split[0] value := strings.Join(split[1:], "") // 3. check path separator splitPath := strings.Split(path, "@") if len(splitPath) > 2 { return fmt.Errorf("invalid path (additional '@'?)") } d.File = splitPath[0] if len(splitPath) > 1 { // add field path only if set d.Path = splitPath[1] } // add value d.Value = value d.raw = _args return nil } func (d config) Exec(ctx ExecutionContext) ([]byte, error) { // 1. try to load format format, err := cnf.Load(d.File) if err != nil { return nil, err } // 2. try to update value if !format.Set(d.Path, d.Value) { return nil, ErrImpossible } // 3. Update file file, err := os.OpenFile(d.File, os.O_WRONLY, 0) if err != nil { return nil, err } defer file.Close() if err = format.Write(file); err != nil { return nil, err } return nil, nil }