user.go
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user.go
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	package config

	import (
	"encoding/json"
	"io/ioutil"
	"path/filepath"

	writeas "github.com/writeas/go-writeas/v2"
	"github.com/writeas/writeas-cli/fileutils"
	"gopkg.in/urfave/cli.v1"
	)

	const UserFile = "user.json"

	func LoadUser(c cli.Context) (writeas.AuthUser, error) {
	dir, err := userHostDir(c)
	if err != nil {
	return nil, err
	}
	fname := filepath.Join(dir, UserFile)
	userJSON, err := ioutil.ReadFile(fname)
	if err != nil {
	if !fileutils.Exists(fname) {
	// Don't return a file-not-found error
	return nil, nil
	}
	return nil, err
	}

	// Parse JSON file
	u := &writeas.AuthUser{}
	err = json.Unmarshal(userJSON, u)
	if err != nil {
	return nil, err
	}
	return u, nil
	}

	func SaveUser(c cli.Context, u writeas.AuthUser) error {
	// Marshal struct into pretty-printed JSON
	userJSON, err := json.MarshalIndent(u, "", " ")
	if err != nil {
	return err
	}

	dir, err := userHostDir(c)
	if err != nil {
	return err
	}
	DirMustExist(dir)
	// Save file
	err = ioutil.WriteFile(filepath.Join(dir, UserFile), userJSON, 0600)
	if err != nil {
	return err
	}
	return nil
	}

	func userHostDir(c *cli.Context) (string, error) {
	dataDir := UserDataDir(c.App.ExtraInfo()["configDir"])
	hostDir, err := HostDirectory(c)
	if err != nil {
	return "", err
	}
	return filepath.Join(dataDir, hostDir), nil
	}