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config.go
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config.go
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package main
import (
"encoding/json"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
"github.com/juju/errors"
)
var (
rubbishFolder = ""
configFile = ""
configFolder = ""
)
const (
configFolderName = ".rubbish"
configFileName = "config.json"
)
// Folder represents a folder object
type Folder struct {
Name string `json:"name,omitempty"`
Path string `json:"path,omitempty"`
}
// Config represents a configuration file object
type Config struct {
Folders []Folder `json:"folders"`
Latest Folder `json:"latest"`
Root string `json:"root"`
}
// Initialize creates the required folder structure and an initial configuration file
func Initialize(root string) error {
// Pre-configure folders
if home, err := os.UserHomeDir(); err != nil {
os.Exit(1)
} else {
configFolder = filepath.Join(home, configFolderName)
if err := os.MkdirAll(configFolder, 0755); err != nil {
return errors.Errorf("unable to create directory tree: %+v", err)
}
configFile = filepath.Join(home, configFolderName, configFileName)
}
if _, err := os.Stat(configFile); err == nil {
// Reload configuration
config, err := Load()
if err != nil {
return err
}
rubbishFolder = config.Root
return nil
} else if os.IsNotExist(err) {
// Create configuration from scratch
if err := Init(root); err != nil {
return err
}
}
return nil
}
// Init initializes the configuration file
func Init(root string) error {
rubbishFolder = filepath.Join(root, "rubbish")
if err := initConifg(); err != nil {
return err
}
return nil
}
func initConifg() error {
config := &Config{
Folders: []Folder{},
Latest: Folder{},
Root: rubbishFolder,
}
if _, err := os.Create(configFile); err != nil {
return errors.Errorf("failed to create configuration file: %+v", err)
}
if err := config.Save(); err != nil {
return err
}
return nil
}
// Clean will remove the root rubbish folder and will recreate the configuration
func (config *Config) Clean() error {
if err := os.RemoveAll(config.Root); err != nil {
return errors.Errorf("failed to remove the folder: %+v", err)
}
if err := initConifg(); err != nil {
return err
}
return nil
}
// Load returns the configuration parsed from the configuration file
func Load() (*Config, error) {
b, err := ioutil.ReadFile(configFile)
if err != nil {
return nil, errors.Errorf("failed to read file: %+v", err)
}
config := &Config{}
if err := json.Unmarshal([]byte(b), config); err != nil {
return nil, errors.Errorf("failed to decode data: %+v", err)
}
return config, nil
}
// Save dumps the current status of the configuration to disk
func (config *Config) Save() error {
data, err := json.MarshalIndent(config, "", " ")
if err != nil {
return errors.Errorf("failed to encode data: %+v", err)
}
if err := ioutil.WriteFile(configFile, data, 0644); err != nil {
return errors.Errorf("failed to write file: %+v", err)
}
return nil
}
func createFolder(folder Folder) error {
if err := os.MkdirAll(folder.Path, 0755); err != nil {
return errors.Errorf("failed to create directory tree: %+v", err)
}
return nil
}
func (config *Config) doesFolderExist(folder Folder) bool {
for _, fol := range config.Folders {
if fol.Name == folder.Name {
return true
}
}
return false
}
// GetFolder returns a cannonical folder for the given name
func GetFolder(name string) Folder {
return Folder{
Name: name,
Path: filepath.Join(rubbishFolder, name),
}
}
// AddFolder adds a folder to the configuration and becomes it the latest folder
func (config *Config) AddFolder(name string) error {
folder := GetFolder(name)
if config.doesFolderExist(folder) {
return nil
}
if err := createFolder(folder); err != nil {
return err
}
config.Folders = append(config.Folders, folder)
sortFolders(config.Folders)
if err := config.updateLatest(folder); err != nil {
return err
}
return nil
}
// Show prints all the folder entries
func (config *Config) Show() error {
for n, folder := range config.Folders {
fmt.Printf("[%d] %s\t%s\n", n, folder.Name, folder.Path)
}
return nil
}
// Use changes the latest folder to the provided folder number
func (config *Config) Use(fn int) error {
if fn > len(config.Folders)-1 {
return errors.Errorf("the provided folder number does not match any existing folder")
}
if err := config.updateLatest(config.Folders[fn]); err != nil {
return err
}
return nil
}
// RemoveFolder removes a folder from the configuration and the filesystem
// If the folder is marked as latest, the last folder entry becomes latest.
func (config *Config) RemoveFolder(fn int) error {
if err := os.RemoveAll(config.Folders[fn].Path); err != nil {
return errors.Errorf("failed to remove the folder: %+v", err)
}
config.Flush()
return nil
}
// Flush iterates over the folder entries and remove them from the configuration if they are not present anymore.
func (config *Config) Flush() (errs error) {
var folders = []Folder{}
for _, fol := range config.Folders {
if _, err := os.Stat(fol.Path); err == nil {
folders = append(folders, fol)
}
}
sortFolders(folders)
// If the latest folder was removed, point to the last folder in the list
var shouldUpdateLatest = true
for _, fol := range folders {
if fol.Path == config.Latest.Path {
shouldUpdateLatest = false
break
}
}
if shouldUpdateLatest {
config.updateLatest(folders[len(folders)-1])
}
config.Folders = folders
return errors.Trace(errs)
}
// https://stackoverflow.com/questions/37334119/how-to-delete-an-element-from-a-slice-in-golang/37335777#37335777
func remove(s []Folder, i int) []Folder {
s[len(s)-1], s[i] = s[i], s[len(s)-1]
return s[:len(s)-1]
}
func (config *Config) updateLatest(folder Folder) error {
config.Latest = folder
latestFolder := GetFolder("latest")
// Remove existing symlink
if _, err := os.Lstat(latestFolder.Path); err == nil {
if err := os.Remove(latestFolder.Path); err != nil {
return errors.Errorf("failed to remove the current latest symlink: %+v", err)
}
}
if err := os.Symlink(config.Latest.Name, latestFolder.Path); err != nil {
return errors.Errorf("failed to create the latest symlink: %+v", err)
}
return nil
}
func sortFolders(folders []Folder) {
sort.SliceStable(folders, func(i int, j int) bool {
return folders[i].Name < folders[j].Name
})
}