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// Copyright 2009 The "config" Authors
//
// 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 config
import (
"bufio"
"fmt"
"os"
"strings"
)
// WriteFile saves the configuration representation to a file.
// The desired file permissions must be passed as in os.Open. The header is a
// string that is saved as a comment in the first line of the file.
func (c *Config) WriteFile(fname string, perm os.FileMode, header string) error {
file, err := os.OpenFile(fname, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, perm)
if err != nil {
return err
}
buf := bufio.NewWriter(file)
if err = c.write(buf, header); err != nil {
return err
}
buf.Flush()
return file.Close()
}
func (c *Config) write(buf *bufio.Writer, header string) (err error) {
if header != "" {
// Add comment character after of each new line.
if i := strings.Index(header, "\n"); i != -1 {
header = strings.Replace(header, "\n", "\n"+c.comment, -1)
}
if _, err = buf.WriteString(c.comment + header + "\n"); err != nil {
return err
}
}
for _, orderedSection := range c.Sections() {
for section, sectionMap := range c.data {
if section == orderedSection {
// Skip default section if empty.
if section == DEFAULT_SECTION && len(sectionMap) == 0 {
continue
}
if _, err = buf.WriteString("\n[" + section + "]\n"); err != nil {
return err
}
// Follow the input order in options.
for i := 0; i < c.lastIdOption[section]; i++ {
for option, tValue := range sectionMap {
if tValue.position == i {
if _, err = buf.WriteString(fmt.Sprint(
option, c.separator, tValue.v, "\n")); err != nil {
return err
}
c.RemoveOption(section, option)
break
}
}
}
}
}
}
if _, err = buf.WriteString("\n"); err != nil {
return err
}
return nil
}
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