/
conf.go
126 lines (107 loc) · 2.95 KB
/
conf.go
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// Package conf provides means to load gonsot configuration on-disk
package conf
import (
"fmt"
"os"
"path/filepath"
"strconv"
"github.com/BurntSushi/toml"
"github.com/go-ini/ini"
"github.com/pkg/errors"
"github.com/serenize/snaker"
)
var (
home = os.Getenv("HOME")
sysCFG = filepath.Join("/etc", "gonsot.toml")
userCFG = filepath.Join(home, ".gonsot.toml")
)
// loadTOML loads configs that can be at two locations, listed in
// merge-priority:
// 1. $HOME/.gonsot.toml
// 2. /etc/gonsot.toml
func (c *Config) loadTOML() error {
var systemErr error
var userErr error
// Try opening system-level config, mapping to *Config if it works
if _, err := toml.DecodeFile(sysCFG, c); err != nil {
systemErr = err
}
// Try opening user-level config and map to *Config. Should overwrite
// values added by system and this is desired to merge
if _, err := toml.DecodeFile(userCFG, c); err != nil {
userErr = err
}
if systemErr != nil && userErr != nil {
msg := fmt.Sprintf("Failed to open and validate files: %s %s", userCFG, sysCFG)
err := errors.New(msg)
return errors.Wrap(err, "Failed to load TOML")
}
return nil
}
// convertINI converts pynsot config to gonsot
func convertINI() (err error) {
p := filepath.Join("/etc", "pynsotrc") // Parent
c := filepath.Join(home, ".pynsotrc") // Child
cfg, err := ini.LooseLoad(p, c) // `c` has higher merge pri over `p`
if err != nil {
return err
}
// Encode TOML to file
f, err := os.Create("/home/coxley/.gonsot.toml")
if err != nil {
return err
}
defer f.Close()
// INI parses values as all strings, we'll convert to int if possible
// In addition to that, we'll map snake_case to PascalCase
iniConfig := map[string]interface{}{}
for k, v := range cfg.Section("pynsot").KeysHash() {
num, err := strconv.Atoi(v)
nk := snaker.SnakeToCamel(k) // New key
if err != nil {
iniConfig[nk] = v
continue
}
iniConfig[nk] = num
}
if err := toml.NewEncoder(f).Encode(iniConfig); err != nil {
return err
}
return nil
}
// Load marshalls config files into the struct automatically
//
// There are two locations for gonsot.toml
//
// * System level (Under /etc)
// * User level (Under $HOME as a dotfile)
//
// User level configs will be preferred, merging if possible with system
// config. This allows "global" configuration but lets a user do overrides
//
// If existing INI config from pynsot exists and no TOML found, will create
// TOML config with the same settings
func (c *Config) Load() error {
if err := c.loadTOML(); err != nil {
// TOML not found, attempt to convert pynsotrc INI to TOML if it exists
_ = convertINI()
// Attempt reload of TOML
if err := c.loadTOML(); err != nil {
return err
}
return nil
}
return nil
}
// Dump writes the Config instance to provided filename
func (c *Config) Dump(fn string) error {
f, err := os.Create(fn)
if err != nil {
return err
}
defer f.Close()
if err := toml.NewEncoder(f).Encode(*c); err != nil {
return err
}
return nil
}