144 lines
3.2 KiB
Go
144 lines
3.2 KiB
Go
package main
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"os"
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"os/user"
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"path/filepath"
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"github.com/haunt98/copy-go"
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)
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const (
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configFilePath = "config/config.json"
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homeSymbol = '~'
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)
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type Config struct {
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// Read from file
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Apps map[string]App `json:"apps"`
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}
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type App struct {
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Files []Path `json:"files"`
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Dirs []Path `json:"dirs"`
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}
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type Path struct {
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Internal string `json:"internal"`
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External string `json:"external"`
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}
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type copyFn func(from, to string) error
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// Load config from file
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func LoadConfig(path string) (result Config, err error) {
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configPath := getConfigPath(path)
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f, err := os.Open(configPath)
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if err != nil {
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// https://github.com/golang/go/blob/3e1e13ce6d1271f49f3d8ee359689145a6995bad/src/os/error.go#L90-L91
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if errors.Is(err, os.ErrNotExist) {
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err = fmt.Errorf("file not exist %s: %w", configPath, err)
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return
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}
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}
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defer f.Close()
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bytes, err := ioutil.ReadAll(f)
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if err != nil {
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err = fmt.Errorf("failed to read %s: %w", configPath, err)
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return
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}
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if err = json.Unmarshal(bytes, &result); err != nil {
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err = fmt.Errorf("failed to unmarshal: %w", err)
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return
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}
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return
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}
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// internal -> external
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func (c *Config) Install() error {
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for _, app := range c.Apps {
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for _, file := range app.Files {
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if err := removeAndCopy(file.Internal, file.External, copy.CopyFile); err != nil {
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return fmt.Errorf("failed to remove and copy from %s to %s: %w", file.Internal, file.External, err)
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}
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}
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for _, dir := range app.Dirs {
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if err := removeAndCopy(dir.Internal, dir.External, copy.CopyDir); err != nil {
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return fmt.Errorf("failed to remove and copy from %s to %s: %w", dir.Internal, dir.External, err)
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}
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}
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}
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return nil
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}
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// external -> internal
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func (c *Config) Update() error {
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for _, app := range c.Apps {
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for _, file := range app.Files {
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if err := removeAndCopy(file.External, file.Internal, copy.CopyFile); err != nil {
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return fmt.Errorf("failed to remove and copy from %s to %s: %w", file.External, file.Internal, err)
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}
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}
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for _, dir := range app.Dirs {
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if err := removeAndCopy(dir.External, dir.Internal, copy.CopyDir); err != nil {
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return fmt.Errorf("failed to remove and copy from %s to %s: %w", dir.External, dir.Internal, err)
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}
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}
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}
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return nil
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}
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func getConfigPath(path string) string {
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return filepath.Join(path, configFilePath)
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}
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func removeAndCopy(from, to string, fn copyFn) error {
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newFrom, err := replaceHomeSymbol(from)
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if err != nil {
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return fmt.Errorf("failed to replace home symbol %s: %w", from, err)
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}
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newTo, err := replaceHomeSymbol(to)
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if err != nil {
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return fmt.Errorf("failed to replace home symbol %s: %w", to, err)
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}
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if err := os.RemoveAll(newTo); err != nil {
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return fmt.Errorf("failed to remove %s: %w", newTo, err)
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}
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if err := fn(newFrom, newTo); err != nil {
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return fmt.Errorf("failed to copy from %s to %s: %w", newFrom, newTo, err)
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}
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return nil
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}
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// replace ~
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// https://stackoverflow.com/a/17609894
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func replaceHomeSymbol(path string) (string, error) {
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if path == "" || path[0] != homeSymbol {
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return path, nil
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}
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currentUser, err := user.Current()
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if err != nil {
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return "", err
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}
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newPath := filepath.Join(currentUser.HomeDir, path[1:])
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return newPath, nil
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}
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