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// Copyright 2015 CoreOS, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package unit
import (
"bytes"
"io"
)
// Serialize encodes all of the given UnitOption objects into a
// unit file. When serialized the options are sorted in their
// supplied order but grouped by section.
func Serialize(opts []*UnitOption) io.Reader {
var buf bytes.Buffer
if len(opts) == 0 {
return &buf
}
// Index of sections -> ordered options
idx := map[string][]*UnitOption{}
// Separately preserve order in which sections were seen
sections := []string{}
for _, opt := range opts {
sec := opt.Section
if _, ok := idx[sec]; !ok {
sections = append(sections, sec)
}
idx[sec] = append(idx[sec], opt)
}
for i, sect := range sections {
writeSectionHeader(&buf, sect)
writeNewline(&buf)
opts := idx[sect]
for _, opt := range opts {
writeOption(&buf, opt)
writeNewline(&buf)
}
if i < len(sections)-1 {
writeNewline(&buf)
}
}
return &buf
}
func writeNewline(buf *bytes.Buffer) {
buf.WriteRune('\n')
}
func writeSectionHeader(buf *bytes.Buffer, section string) {
buf.WriteRune('[')
buf.WriteString(section)
buf.WriteRune(']')
}
func writeOption(buf *bytes.Buffer, opt *UnitOption) {
buf.WriteString(opt.Name)
buf.WriteRune('=')
buf.WriteString(opt.Value)
}
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