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package simpleconf
import (
"bufio"
"errors"
"fmt"
"io"
"os"
"strconv"
"strings"
)
type Config map[string]Section
type Section map[string]string
func (c Config) addSection(section Section, name string) {
if section != nil {
c[name] = section
}
}
func Load(r io.Reader) (config Config, outerr error) {
config = make(Config)
scanner := bufio.NewScanner(r)
var section Section
var sectName string
for l := 1; scanner.Scan(); l++ {
line := strings.TrimSpace(scanner.Text())
if len(line) == 0 {
continue
}
switch line[0] {
case ';', '#':
continue
case '[':
parts := strings.SplitN(line, "[", 2)
parts = strings.SplitN(parts[1], "]", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("Missing closing ']' in section header at line %d", l)
}
if len(parts[1]) != 0 {
return nil, fmt.Errorf("More data after closing ']' at line %d", l)
}
config.addSection(section, sectName)
section = make(Section)
default:
parts := strings.SplitN(line, "=", 2)
if len(parts) != 2 {
return nil, fmt.Errorf("Couldn't neither find a comment, a section header nor a key-value pair at line %d", l)
}
key := strings.TrimSpace(parts[0])
val := strings.TrimSpace(parts[1])
if len(key) == 0 {
return nil, fmt.Errorf("Empty key at line %d", l)
}
if section == nil {
return nil, fmt.Errorf("Found key-value pair, but no section at line %d", l)
}
section[key] = val
}
}
config.addSection(section, sectName)
outerr = scanner.Err()
return
}
var (
NotFound = errors.New("Section or key not found.")
NotBool = errors.New("Could not interpret value as bool.")
)
func (c Config) GetString(section, key string) (string, error) {
s, ok := c[section]
if !ok {
return "", NotFound
}
rv, ok := s[key]
if !ok {
return "", NotFound
}
return rv, nil
}
func (c Config) GetStringDefault(d, section, key string) (string, error) {
rv, err := c.GetString(section, key)
if err == NotFound {
return d, nil
}
return rv, err
}
func (c Config) GetInt(section, key string) (int64, error) {
s, err := c.GetString(section, key)
if err != nil {
return 0, err
}
return strconv.ParseInt(s, 10, 64)
}
func (c Config) GetIntDefault(d int64, section, key string) (int64, error) {
rv, err := c.GetInt(section, key)
if err == NotFound {
return d, nil
}
return rv, err
}
func (c Config) GetFloat(section, key string) (float64, error) {
s, err := c.GetString(section, key)
if err != nil {
return 0, err
}
return strconv.ParseFloat(s, 64)
}
func (c Config) GetFloatDefault(d float64, section, key string) (float64, error) {
rv, err := c.GetFloat(section, key)
if err == NotFound {
return d, nil
}
return rv, err
}
func (c Config) GetBool(section, key string) (bool, error) {
s, err := c.GetString(section, key)
if err != nil {
return false, err
}
switch strings.ToLower(s) {
case "true", "on", "yes", "y", "1":
return true, nil
case "false", "off", "no", "n", "0":
return false, nil
default:
return false, NotBool
}
}
func (c Config) GetBoolDefault(d bool, section, key string) (bool, error) {
rv, err := c.GetBool(section, key)
if err == NotFound {
return d, nil
}
return rv, err
}
func (c Config) GetFile(flag int, perm os.FileMode, section, key string) (*os.File, error) {
s, err := c.GetString(section, key)
if err != nil {
return nil, err
}
return os.OpenFile(s, flag, perm)
}
func (c Config) GetFileReadonly(section, key string) (*os.File, error) {
return c.GetFile(os.O_RDONLY, 0, section, key)
}
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