Add config stuff

config/config.go

@@ -0,0 +1,7 @@
+package config
+
+type Config struct {
+	Token        string `json:"token"`
+	URL          string `json:"url"`
+	FromLocation string `json:"-"`
+}

config/locations.go

@@ -0,0 +1,28 @@
+package config
+
+import (
+	"os/user"
+	"path/filepath"
+	"runtime"
+
+	"github.com/gotify/cli/utils"
+)
+
+func userDir() string {
+	usr, err := user.Current()
+	if err != nil {
+		utils.Exit1With(err)
+	}
+	return usr.HomeDir
+}
+
+func GetLocations() []string {
+	inUserDir := filepath.Join(userDir(), ".gotify", "cli.json")
+	etcPath := "/etc/gotify/cli.json"
+	relativePath := "./cli.json"
+	if runtime.GOOS == "windows" {
+		return []string{relativePath, inUserDir}
+	} else {
+		return []string{relativePath, inUserDir, etcPath}
+	}
+}

config/readwrite.go

@@ -0,0 +1,63 @@
+package config
+
+import (
+	"encoding/json"
+	"errors"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+)
+
+var (
+	ErrNoneSet = errors.New("no config set, run 'gotify init'")
+)
+
+func ExistingConfig(locations []string) (string, error) {
+	for _, location := range locations {
+		_, err := os.Stat(location)
+
+		if err == nil {
+			return location, nil
+		}
+	}
+
+	for _, location := range locations {
+		_, err := os.Stat(location)
+
+		if os.IsPermission(err) {
+			return "", errors.New("Permission denied " + location)
+		}
+	}
+
+	return "", ErrNoneSet
+}
+
+func ReadConfig(locations []string) (*Config, error) {
+	location, err := ExistingConfig(locations)
+	if err != nil {
+		return nil, err
+	}
+	file, err := os.Open(location)
+	defer file.Close()
+	if err != nil {
+		panic(err)
+	}
+
+	conf := Config{}
+	conf.FromLocation = location
+	err = json.NewDecoder(file).Decode(&conf)
+
+	if err != nil {
+		return nil, errors.New("Error while decoding " + err.Error())
+	}
+	return &conf, nil
+}
+
+func WriteConfig(location string, conf *Config) error {
+	bytes, err := json.MarshalIndent(conf,"", "  ")
+	if err != nil {
+		return err
+	}
+	os.MkdirAll(filepath.Dir(location), 0644)
+	return ioutil.WriteFile(location, bytes, 0644)
+}