101 lines
1.6 KiB
Go
101 lines
1.6 KiB
Go
package gosimpleconf
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import (
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"bufio"
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"flag"
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"fmt"
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"io"
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"log"
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"os"
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"strconv"
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"strings"
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)
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type ConfigMap map[string]string
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type FlagMap map[string]*string
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func Load(filename string) (ConfigMap, error) {
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var err error
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file, err := os.Open(filename)
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if err != nil {
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return nil, err
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}
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defer file.Close()
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parsedMap, err := parseFile(file)
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if err != nil {
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return nil, err
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}
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return parsedMap, nil
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}
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func SetupFlagOverrides(configMap ConfigMap) FlagMap {
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flagMap := make(FlagMap)
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for k, v := range configMap {
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f := flag.String(k, v, "")
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flagMap[k] = f
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}
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return flagMap
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}
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func ParseFlags(configMap ConfigMap, flagMap FlagMap) ConfigMap {
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flag.Parse()
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for k, v := range flagMap {
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if v != nil && len(*v) > 0 {
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configMap[k] = *v
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}
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}
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return configMap
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}
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func Bool(value string) bool {
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v, err := strconv.ParseBool(value)
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if err != nil {
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log.Printf("error parsing bool %v - %v", v, err)
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v = false
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}
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return v
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}
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func parseFile(config io.Reader) (ConfigMap, error) {
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var err error
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parsedMap := make(ConfigMap)
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scanner := bufio.NewScanner(config)
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for scanner.Scan() {
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line := scanner.Text()
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trimmed := strings.TrimSpace(line)
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if len(trimmed) == 0 {
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// ignore empty lines
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continue
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}
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if trimmed[0] == '#' {
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// ignore comments
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continue
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}
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split := strings.Split(trimmed, "=")
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if len(split) != 2 {
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return nil, fmt.Errorf("failed to parse config line: %v", trimmed)
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}
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key := strings.TrimSpace(split[0])
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value := strings.TrimSpace(split[1])
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parsedMap[key] = value
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}
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if err = scanner.Err(); err != nil {
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return nil, err
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}
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return parsedMap, nil
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}
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