spf13--viper/util.go

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// Copyright © 2014 Steve Francia <spf@spf13.com>.
//
// Use of this source code is governed by an MIT-style
// license that can be found in the LICENSE file.
// Viper is a application configuration system.
// It believes that applications can be configured a variety of ways
// via flags, ENVIRONMENT variables, configuration files retrieved
// from the file system, or a remote key/value store.
package viper
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"path/filepath"
"runtime"
"strings"
"github.com/BurntSushi/toml"
jww "github.com/spf13/jwalterweatherman"
"gopkg.in/yaml.v2"
)
func insensativiseMap(m map[string]interface{}) {
for key, val := range m {
lower := strings.ToLower(key)
if key != lower {
delete(m, key)
m[lower] = val
}
}
}
func absPathify(inPath string) string {
jww.INFO.Println("Trying to resolve absolute path to", inPath)
if strings.HasPrefix(inPath, "$HOME") {
inPath = userHomeDir() + inPath[5:]
}
if strings.HasPrefix(inPath, "$") {
end := strings.Index(inPath, string(os.PathSeparator))
inPath = os.Getenv(inPath[1:end]) + inPath[end:]
}
if filepath.IsAbs(inPath) {
return filepath.Clean(inPath)
}
p, err := filepath.Abs(inPath)
if err == nil {
return filepath.Clean(p)
} else {
jww.ERROR.Println("Couldn't discover absolute path")
jww.ERROR.Println(err)
}
return ""
}
// Check if File / Directory Exists
func exists(path string) (bool, error) {
_, err := os.Stat(path)
if err == nil {
return true, nil
}
if os.IsNotExist(err) {
return false, nil
}
return false, err
}
func stringInSlice(a string, list []string) bool {
for _, b := range list {
if b == a {
return true
}
}
return false
}
func userHomeDir() string {
if runtime.GOOS == "windows" {
home := os.Getenv("HOMEDRIVE") + os.Getenv("HOMEPATH")
if home == "" {
home = os.Getenv("USERPROFILE")
}
return home
}
return os.Getenv("HOME")
}
func findCWD() (string, error) {
serverFile, err := filepath.Abs(os.Args[0])
if err != nil {
return "", fmt.Errorf("Can't get absolute path for executable: %v", err)
}
path := filepath.Dir(serverFile)
realFile, err := filepath.EvalSymlinks(serverFile)
if err != nil {
if _, err = os.Stat(serverFile + ".exe"); err == nil {
realFile = filepath.Clean(serverFile + ".exe")
}
}
if err == nil && realFile != serverFile {
path = filepath.Dir(realFile)
}
return path, nil
}
func marshallConfigReader(in io.Reader, c map[string]interface{}, configType string) {
buf := new(bytes.Buffer)
buf.ReadFrom(in)
switch configType {
case "yaml", "yml":
if err := yaml.Unmarshal(buf.Bytes(), &c); err != nil {
jww.ERROR.Fatalf("Error parsing config: %s", err)
}
case "json":
if err := json.Unmarshal(buf.Bytes(), &c); err != nil {
jww.ERROR.Fatalf("Error parsing config: %s", err)
}
case "toml":
if _, err := toml.Decode(buf.String(), &c); err != nil {
jww.ERROR.Fatalf("Error parsing config: %s", err)
}
}
insensativiseMap(c)
}