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config.go
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config.go
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package gxutil
import (
"bytes"
"encoding/json"
"fmt"
"os"
homedir "github.com/mitchellh/go-homedir"
"path/filepath"
)
const CfgFileName = ".gxrc"
type Config struct {
Repos map[string]string `json:"repos,omitempty"`
ExtraRepos map[string]string `json:"extra_repos,omitempty"`
User User `json:"user,omitempty"`
}
func (c *Config) GetRepos() map[string]string {
if len(c.ExtraRepos) == 0 {
return c.Repos
}
combined := make(map[string]string)
for k, v := range c.Repos {
combined[k] = v
}
for k, v := range c.ExtraRepos {
combined[k] = v
}
return combined
}
type User struct {
Name string `json:"name,omitempty"`
Email string `json:"email,omitempty"`
}
func LoadConfig() (*Config, error) {
home, err := homedir.Dir()
if err != nil {
return nil, err
}
// first check $HOME/.gxrc
cfg, err := loadFile(filepath.Join(home, CfgFileName))
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
}
cwd, err := os.Getwd()
if err != nil {
return nil, err
}
local, err := loadFile(filepath.Join(cwd, CfgFileName))
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
}
if local == nil {
return mapToCfg(cfg)
}
if cfg == nil {
return mapToCfg(local)
}
merged := mergeMaps(cfg, local)
return mapToCfg(merged)
}
func mergeMaps(base, extra map[string]interface{}) map[string]interface{} {
if base == nil {
return extra
}
for k, v := range extra {
bk, ok := base[k]
if !ok {
base[k] = v
continue
}
bmp, bmpok := bk.(map[string]interface{})
emp, empok := v.(map[string]interface{})
if !bmpok || !empok {
// if the field is not an object, overwrite
base[k] = v
continue
}
base[k] = mergeMaps(bmp, emp)
}
return base
}
func LoadConfigFrom(paths ...string) (*Config, error) {
if len(paths) == 0 {
return nil, fmt.Errorf("no path specified!")
}
base := paths[0]
paths = paths[1:]
cfg, err := loadFile(base)
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
}
for _, np := range paths {
next, err := loadFile(np)
if err != nil {
if !os.IsNotExist(err) {
return nil, err
}
}
cfg = mergeMaps(cfg, next)
}
rcfg, err := mapToCfg(cfg)
if err != nil {
return nil, err
}
sanityFill(rcfg)
return rcfg, nil
}
func sanityFill(c *Config) {
if c.ExtraRepos == nil {
c.ExtraRepos = make(map[string]string)
}
if c.Repos == nil {
c.Repos = make(map[string]string)
}
}
func loadFile(fname string) (map[string]interface{}, error) {
var cfg map[string]interface{}
fi, err := os.Open(fname)
if err != nil {
return nil, err
}
err = json.NewDecoder(fi).Decode(&cfg)
if err != nil {
return nil, err
}
return cfg, nil
}
func mapToCfg(cfg map[string]interface{}) (*Config, error) {
if cfg == nil {
return new(Config), nil
}
buf := new(bytes.Buffer)
err := json.NewEncoder(buf).Encode(cfg)
if err != nil {
return nil, err
}
out := new(Config)
err = json.NewDecoder(buf).Decode(out)
if err != nil {
return nil, err
}
return out, nil
}
func WriteConfig(cfg *Config, file string) error {
fi, err := os.Create(file)
if err != nil {
return err
}
defer fi.Close()
return json.NewEncoder(fi).Encode(cfg)
}