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|
package config
import (
"fmt"
"io"
"strings"
)
// An Encoder writes config files to an output stream.
type Encoder struct {
w io.Writer
}
var (
subsectionReplacer = strings.NewReplacer(`"`, `\"`, `\`, `\\`)
valueReplacer = strings.NewReplacer(`"`, `\"`, `\`, `\\`, "\n", `\n`, "\t", `\t`, "\b", `\b`)
)
// NewEncoder returns a new encoder that writes to w.
func NewEncoder(w io.Writer) *Encoder {
return &Encoder{w}
}
// Encode writes the config in git config format to the stream of the encoder.
func (e *Encoder) Encode(cfg *Config) error {
for _, s := range cfg.Sections {
if err := e.encodeSection(s); err != nil {
return err
}
}
return nil
}
func (e *Encoder) encodeSection(s *Section) error {
if len(s.Options) > 0 {
if err := e.printf("[%s]\n", s.Name); err != nil {
return err
}
if err := e.encodeOptions(s.Options); err != nil {
return err
}
}
for _, ss := range s.Subsections {
if err := e.encodeSubsection(s.Name, ss); err != nil {
return err
}
}
return nil
}
func (e *Encoder) encodeSubsection(sectionName string, s *Subsection) error {
if err := e.printf("[%s \"%s\"]\n", sectionName, subsectionReplacer.Replace(s.Name)); err != nil {
return err
}
return e.encodeOptions(s.Options)
}
func (e *Encoder) encodeOptions(opts Options) error {
for _, o := range opts {
var value string
if strings.ContainsAny(o.Value, "#;\"\t\n\\") || strings.HasPrefix(o.Value, " ") || strings.HasSuffix(o.Value, " ") {
value = `"`+valueReplacer.Replace(o.Value)+`"`
} else {
value = o.Value
}
if err := e.printf("\t%s = %s\n", o.Key, value); err != nil {
return err
}
}
return nil
}
func (e *Encoder) printf(msg string, args ...interface{}) error {
_, err := fmt.Fprintf(e.w, msg, args...)
return err
}
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